FUJITSU MB3874, MB3876 DATA SHEET
MB3874
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FUJITSU SEMICONDUCTOR |
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DS04-27704-2E |
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DATA SHEET |
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ASSP For Power Supply Applications (Lithium ion battery charger)
DC/DC Converter IC for Parallel Charging
MB3874/MB3876
■ DESCRIPTION
The MB3874 and MB3876 are parallel charging DC/DC converter ICs suitable for down-conversion, which uses pulse width modulation (PWM) for controlling the output voltage and current independently.
These ICs can dynamically control the secondary battery’s charge current by detecting a voltage drop in an AC adapter in order to keep its power constant (dynamically-controlled charging).
The charging method enables quick charging, for example, with the AC adapter during operation of a notebook PC.
The IC also enable parallel charging, or charging two batteries at the same time, dramatically reducing the charging time.
With an on-chip output voltage setting resistor which allows the output voltage to be set at high precision, these ICs are best suited as internal battery chargers for notebook PCs.
The MB3874 support 3-cell battery and the MB3876 support 4-cell battery.
■ FEATURES
•Detecting a voltage drop in the AC adapter and dynamically controlling the charge current (Dynamically-con- trolled charging)
• High efficiency |
: 93 %(In reverse-current preventive diode) |
• Wide range of operating supply voltages |
: 7 V to 25 V |
• Output voltage precision |
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(Built-in output voltage setting resistor ) |
: ± 0.8 % (Ta = + 25 °C) |
• High precision reference voltage source |
: 4.2 V ± 0.8 % |
■ PACKAGE |
(Continued) |
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24-pin plastic SSOP |
(FPT-24P-M03)
MB3874/MB3876
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(Continued) |
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Support for frequency setting using an external resistor |
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(Frequency setting capacitor integrated) |
:100 kHz to 500 kHz |
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Built-in current detector amplifier with wide in-phase input voltage range |
: 0 V to VCC |
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Built-in standby current function |
: 0 A (Typ.) |
•Built-in soft start function
•Capable of parallel charging (Charging the two battery packs at a time)
•Internal totem-pole output stage supporting P-channel MOS FETs devices
2
MB3874/MB3876
■ PIN ASSIGNMENT
(TOP VIEW)
−INC1 |
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1 |
24 |
: +INC1 |
FB2 |
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2 |
23 |
: GND |
−INE2 |
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3 |
22 |
: CS |
+INE2 |
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4 |
21 |
: VCC |
VREF |
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5 |
20 |
: OUT |
CTL |
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6 |
19 |
: VH |
FB1 |
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7 |
18 |
: OUTM |
−INE1 |
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8 |
17 |
: RT |
+INE3 |
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9 |
16 |
: −INE4 |
−INE3 |
: 10 |
15 |
: FB4 |
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FB3 |
: 11 |
14 |
: −INE5 |
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−INC2 |
: 12 |
13 |
: +INC2 |
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(FPT-24P-M03)
3
MB3874/MB3876
■ PIN DESCRIPTION
Pin No. |
Symbol |
I/O |
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Descriptions |
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1 |
–INC1 |
I |
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Output voltage feedback input pin. |
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2 |
FB2 |
O |
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Error amplifier (Error Amp. 2) output pin. |
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3 |
–INE2 |
I |
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Error amplifier (Error Amp. 2) inverted input pin. |
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4 |
+INE2 |
I |
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Error amplifier (Error Amp. 2) non-inverted input pin. |
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Input pin for charge current setting voltage |
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5 |
VREF |
O |
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Reference voltage output pin. |
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6 |
CTL |
I |
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Power supply control pin. |
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Setting the CTL pin low places the IC in the standby mode. |
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7 |
FB1 |
O |
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Error amplifier (Error Amp. 1) output pin. |
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8 |
–INE1 |
I |
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Error amplifier (Error Amp. 1) inverted input pin |
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Input pin for dynamically-controlled charging voltage setting |
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9 |
+INE3 |
I |
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Error amplifier (Error Amp. 3) non-inverted input pin. |
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Input pin for charge current setting voltage |
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10 |
–INE3 |
I |
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Error amplifier (Error Amp. 3) inverted input pin. |
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11 |
FB3 |
O |
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Error amplifier (Error Amp. 3) output pin. |
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12 |
–INC2 |
I |
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Output voltage feedback input pin. |
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13 |
+INC2 |
I |
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Current detection amplifier (Current Amp. 2) input pin . |
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14 |
–INE5 |
I |
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Error amplifier (Error Amp. 5) inverted input pin. |
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15 |
FB4 |
O |
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Error amplifier (Error Amp. 4, 5) output pin. |
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16 |
–INE4 |
I |
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Error amplifier (Error Amp. 4) inverted input pin. |
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17 |
RT |
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Triangular-wave oscillation frequency setting resistor connection pin. |
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Output pin for dynamically controlled charging identification signal |
18 |
OUTM |
O |
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“H” level: Constant-voltage or constant-current charging mode |
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“L” level: Dynamically controlled charging mode |
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19 |
VH |
O |
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Power supply pin for FET drive circuit (VH = Vcc − 5 V). |
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20 |
OUT |
O |
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High-side FET gate drive pin. |
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21 |
VCC |
— |
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Power supply pin for reference power supply and control circuit. |
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22 |
CS |
— |
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Soft-start capacitor connection pin. |
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23 |
GND |
— |
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Ground pin. |
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24 |
+INC1 |
I |
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Current detection amplifier (Current Amp. 1) input pin . |
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4
MB3874/MB3876
■ BLOCK DIAGRAM
−INE1 |
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<Error Amp.1> VREF |
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<MASK Comp.> |
OUTM |
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− |
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8 |
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208 kΩ |
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18 |
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+ |
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VCC |
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− |
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42 kΩ |
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+ |
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FB1 |
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7 |
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2.5 V |
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−INE2 |
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3 |
<Current Amp.1> |
<Error |
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+INC1 |
VREF |
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+ |
100 kΩ |
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24 |
Amp.2> |
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−INC1 |
× 25 |
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− |
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VCC |
1 |
− |
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+ |
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VCC |
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21 |
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+INE2 |
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<PWM |
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4 |
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Comp.> |
<OUT> |
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FB2 |
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+ |
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2 |
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+ |
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OUT |
−INE3 |
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+ |
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+ |
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Drive |
20 |
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10 |
<Current Amp.2> |
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− |
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+INC2 |
<Error |
VREF |
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+ |
100 kΩ |
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13 |
Amp.3> |
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−INC2 |
× 25 |
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− |
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VCC |
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12 |
− |
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+ |
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+INE3 |
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VH |
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Bias voltage |
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9 |
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19 |
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block |
(VCC − 5 V) |
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FB3 |
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<VH> |
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11 |
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−INE4 |
R1 |
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<Error |
VREF |
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Amp.4> |
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16 |
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− |
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R2 |
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+ |
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+ |
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50 kΩ |
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<UVLO> |
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VCC |
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R1 |
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<Error |
VREF |
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(VCC UVLO) 215 kΩ |
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−INE5 |
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Amp.5> |
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14 |
R2 |
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− |
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+ |
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+ |
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35 kΩ |
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50 kΩ |
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− |
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VREF |
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0.91 V |
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FB4 |
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(4.2 V) |
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(0.77 V) |
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15 |
<SOFT> |
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VREF |
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VREF |
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ULVO |
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1 µA |
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CS |
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2.5 V |
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bias |
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22 |
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1.5 V |
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CTL |
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<OSC> |
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<Ref> |
<CTL> |
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6 |
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(45 pF) |
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17 |
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5 |
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23 |
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RT |
VREF |
GND |
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:MB3874 100 kΩ |
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MB3876 150 kΩ |
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5
MB3874/MB3876
■ ABSOLUTE MAXIMUM RATINGS
Parameter |
Symbol |
Conditions |
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Rating |
Unit |
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Min. |
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Max. |
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Power supply voltage |
VCC |
— |
— |
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28 |
V |
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Output terminal current |
IOUT |
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— |
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60 |
mA |
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Peak output current |
IOUT |
Duty ≤ 5% (t =1 / fOSC × Duty) |
— |
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500 |
mA |
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OUTM terminal output voltage |
VOUTM |
— |
— |
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17 |
V |
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Power dissipation |
PD |
Ta ≤ +25°C |
— |
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740* |
mW |
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Storage temperature |
Tstg |
— |
–55 |
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+125 |
°C |
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*: The package is mounted on the dual-sided epoxy board (10 cm × 10 cm).
WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current, temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings.
■ RECOMMENDED OPERATING CONDITIONS
Parameter |
Symbol |
Conditions |
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Value |
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Unit |
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Min. |
Typ. |
Max. |
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Power supply voltage |
VCC |
— |
7 |
— |
25 |
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V |
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Reference voltage output |
IREF |
— |
–1 |
— |
0 |
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mA |
current |
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VH pin output current |
IVH |
— |
0 |
— |
30 |
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mA |
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V-INC |
–INC1, –INC2 |
0 |
— |
17 |
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V |
Input voltage |
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VINE |
–INE1 to –INE5, +INE2 |
0 |
— |
V CC – 1.8 |
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V |
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V+INC |
+INC1, +INC2 |
0 |
— |
V CC |
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V |
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CTL pin input voltage |
VCTL |
— |
0 |
— |
25 |
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V |
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Output current |
IOUT |
OUT pin |
–45 |
— |
45 |
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mA |
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Peak output current |
IOUT |
Duty ≤ 5% (t =1 / fOSC × Duty) |
–450 |
— |
450 |
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mA |
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OUTM pin output voltage |
VOUTM |
— |
— |
3 |
15 |
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V |
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OUTM pin output current |
IOUTM |
— |
— |
— |
1 |
mA |
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Oscillator frequency |
fOSC |
— |
100 |
290 |
500 |
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kHz |
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Timing resistor |
RT |
— |
33 |
47 |
130 |
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k Ω |
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Soft-start capacitor |
CS |
— |
— |
2200 |
100000 |
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pF |
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VH pin capacitor |
CVH |
— |
— |
0.1 |
1.0 |
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µF |
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Reference voltage output |
CREF |
— |
— |
0.1 |
1.0 |
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µF |
capacitor |
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Operating ambient temperature |
Ta |
— |
–30 |
+25 |
+85 |
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°C |
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WARNING: The recommended operating conditions are required in order to ensure the normal operation of the semiconductor device. All of the device’s electrical characteristics are warranted when the device is operated within these ranges.
Always use semiconductor devices within their recommended operating condition ranges. Operation outside these ranges may adversely affect reliability and could result in device failure.
No warranty is made with respect to uses, operating conditions, or combinations not represented on the data sheet. Users considering application outside the listed conditions are advised to contact their FUJITSU representatives beforehand.
6
MB3874/MB3876
■ ELECTRICAL CHARACTERISTICS
Parameter
voltageReference |
(Ref)block |
Output voltage |
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Input stability |
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Load stability |
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Short-circuit |
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output current |
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Threshold |
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Undervoltage |
lockoutprotection |
blockcircuit(UVLO) |
voltage |
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voltage |
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Hysteresis width |
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Threshold |
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Hysteresis width |
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Soft-start |
block |
(SOFT) |
Charge current |
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waveformTriangular |
circuitoscillator |
(OSC)block |
Oscillation |
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frequency |
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Frequency tem- |
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perature stability |
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(MB3874 : Ta = +25°C, VCC = 16 V, VREF = 0 mA)
(MB3876 : Ta = +25°C, VCC = 19 V, VREF = 0 mA)
Symbol |
Pin No. |
Conditions |
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Value |
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Unit |
Remarks |
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Min. |
Typ. |
Max. |
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VREF |
5 |
Ta = +25°C |
4.167 |
4.200 |
4.233 |
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V |
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Ta = –30°C to +85°C |
4.158 |
4.200 |
4.242 |
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V |
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Line |
5 |
VCC = 7 V to 25 V |
— |
3 |
10 |
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mV |
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Load |
5 |
VREF = 0 mA to –1 mA |
— |
1 |
10 |
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mV |
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IOS |
5 |
VREF = 1 V |
–25 |
–15 |
–5 |
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mA |
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VTLH |
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VCC = |
6.3 |
6.6 |
6.9 |
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V |
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21 |
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VTHL |
VCC = |
5.3 |
5.6 |
5.9 |
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V |
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VH |
21 |
— |
0.7 |
1.0 |
1.3 |
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V |
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VTLH |
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VREF = |
2.6 |
2.8 |
3.0 |
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V |
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5 |
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VTHL |
VREF= |
2.4 |
2.6 |
2.8 |
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V |
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VH |
5 |
— |
0.05 |
0.20 |
0.35 |
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V |
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ICS |
22 |
— |
–1.3 |
–0.8 |
–0.5 |
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µA |
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fOSC |
20 |
RT = 47 kΩ |
260 |
290 |
320 |
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kHz |
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f/fdt |
20 |
Ta = –30°C to +85°C |
— |
1* |
— |
% |
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*: Standard design value.
(Continued)
7
MB3874/MB3876
(Continued)
(MB3874 : Ta = +25°C, VCC = 16 V, VREF = 0 mA)
(MB3876 : Ta = +25°C, VCC = 19 V, VREF = 0 mA)
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Parameter |
Symbol |
Pin No |
Conditions |
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Value |
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Unit |
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Remarks |
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Min. |
Typ. |
Max. |
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FB1 = 2 V, |
14.00 |
14.20 |
14.40 |
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V |
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MB3874 |
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Threshold |
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–INE1 = 2.35 V |
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VTH |
21 |
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voltage |
FB1 = 2 V, |
16.80 |
17.10 |
17.40 |
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MB3876 |
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–INE1 = 2.83 V |
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amplifierErrorblock |
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Amp.1)(Error |
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Input pin current |
IIN |
8 |
–INE1= 0 V |
–100 |
–30 |
— |
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nA |
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Voltage gain |
AV |
7 |
DC |
— |
100* |
— |
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dB |
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Frequency |
BW |
7 |
AV = 0 dB |
— |
2.0* |
— |
MHz |
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bandwidth |
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Output voltage |
VFBH |
7 |
— |
3.9 |
4.1 |
— |
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V |
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VFBL |
7 |
— |
— |
20 |
200 |
mV |
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Output source |
ISOURCE |
7 |
FB1 = 2 V |
— |
–2.0 |
–0.6 |
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mA |
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current |
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Output sink |
ISINK |
7 |
FB1 = 2 V |
150 |
300 |
— |
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A |
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current |
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Input offset |
VIO |
3,4 |
FB2 = FB3 = 2 V |
— |
1* |
— |
mV |
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voltage |
9,10 |
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Input pin |
IINE |
4,9 |
+INE2 = +INE3 = 0 V |
–100 |
–30 |
— |
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nA |
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current |
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amplifierErrorblock |
Amp.2,(Error3) |
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Common mode |
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3,4 |
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input voltage |
VCM |
— |
0 |
— V |
CC–1.8 V |
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9,10 |
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range |
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Voltage gain |
AV |
2, 11 |
DC |
— |
100* |
— |
dB |
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Frequency |
BW |
2, 11 |
AV = 0 dB |
— |
2.0* |
— |
MHz |
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bandwidth |
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Output voltage |
VFBH |
2, 11 |
— |
3.9 |
4.1 |
— |
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V |
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VFBL |
2, 11 |
— |
— |
20 |
200 |
mV |
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Output source |
ISOURCE |
2, 11 |
FB2 = FB3 = 2 V |
— |
–2.0 |
–0.6 |
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mA |
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current |
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Output sink |
ISINK |
2, 11 |
FB2 = FB3 = 2 V |
150 |
300 |
— |
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A |
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current |
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*: Standard design value. |
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(Continued) |
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8
MB3874/MB3876
(Continued)
Parameter
Threshold voltage
Input current
blockamplifier 5)Amp.4, Error (Current Input resistor
Voltage gain
Frequency bandwidth
Output voltage
Output source current
Output sink current
*: Standard design value.
(MB3874 : Ta = +25°C, VCC = 16 V, VREF = 0 mA)
(MB3876 : Ta = +25°C, VCC = 19 V, VREF = 0 mA)
Symbol |
Pin No |
Conditions |
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Value |
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Unit |
Remarks |
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Min. |
Typ. |
Max. |
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12.500 |
12.600 |
12.700 |
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V |
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FB4 = 2 V, |
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MB3874 |
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Ta = +25 °C |
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VTH |
1, 12 |
16.666 |
16.800 |
16.934 |
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V |
MB3876 |
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FB1 = 2 V, |
12.474 |
12.600 |
12.726 |
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V |
MB3874 |
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Ta = –30 °C to +85 °C |
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16.632 |
16.800 |
16.968 |
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V |
MB3876 |
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IINEH |
1, 12 |
–INC1 = –INC2 = 12.6 V |
— |
84 |
150 |
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µA |
MB3874 |
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–INC1 = –INC2 = 16.8 V |
— |
84 |
150 |
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µA |
MB3876 |
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VCC = 0 V, |
— |
0 |
1 |
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µA |
MB3874 |
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–INC1 = –INC2 = 12.6 V |
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IINEL |
1, 12 |
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VCC = 0 V, |
— |
0 |
1 |
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µA |
MB3876 |
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–INC1 = –INC2 = 16.8 V |
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R1 |
1, 12 |
— |
70 |
100 |
130 |
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kΩ |
MB3874 |
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105 |
150 |
195 |
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kΩ |
MB3876 |
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R2 |
14, 16 |
— |
35 |
50 |
65 |
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k Ω |
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AV |
15 |
DC |
— |
100* |
— |
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dB |
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BW |
15 |
AV = 0 dB |
— |
2.0* |
— MHz |
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VFBH |
15 |
— |
3.9 |
4.1 |
— |
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V |
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VFBL |
15 |
— |
— |
20 |
200 |
mV |
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ISOURCE |
15 |
FB4 = 2 V |
— |
–2.0 |
–0.6 |
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mA |
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ISINK |
15 |
FB4 = 2 V |
150 |
300 |
— |
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µA |
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(Continued)
9
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