mm1438 Mitsumi Electronics, Corp., mm1438 Datasheet

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mm1438

Manufacturer Part Number
mm1438
Description
Lithium-ion Battery Charge Control 1 Cell
Manufacturer
Mitsumi Electronics, Corp.
Datasheet
MITSUMI
MITSUMI
Outline
Series Table
Features
Package
Application
Pin Assignment
This IC is a charge control IC for 1-cell lithium-ion batteries, and provides higher precision charge voltage and
smaller size than MM1332 (conventional charge control IC). It incorporates a low voltage circuit (operates
when SW2 = L) to disable charging low voltage batteries (2.15V typ.). When SW2 = H, the low voltage circuit
is turned off so that low voltage batteries can be charged.
1. Charge voltage accuracy (Ta=25°C)
2. Charge voltage accuracy (Ta=0 to 50°C)
3. Current consumption (charge : on)
4. Current consumption (charge : off)
5. Low voltage detection
6. Leakage current between CEL and CS
VSOP-8B
For lithium-ion battery charge control
MM1438
Lithium-Ion Battery Charge Control (1 cell)
Monolithic IC MM1438
SOP-8C, 8E VSOP-8A, 8B TSOP-16A TSOP-24A
Temperature conditions A: Ta=-25~75°C, B: Ta=-20~70°C, C: Ta=0~50°C,
8
1
BW
AW
Package
VSOP - 8B
7
2
6
3
5
4
D: Ta=0~40°C
±25mV/cell
±30mV/cell
250µA typ.
2µA typ.
2.15V typ.
1µA max.
4.125±0.030
4.225±0.030
voltage (V)
Output
Lithium-Ion Battery Charge Control (1 cell) MM1438
1
2
3
4
5
6
7
8
temperature
conditions
voltage
Output
C
C
GND
SW2
SW1
EXT
CEL
V
LV
CS
voltage (mV)
Full charge
CC
detection
Over voltage
voltage (v)
detection
Remarks
1cell
1cell
*

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mm1438 Summary of contents

Page 1

... Low voltage detection 6. Leakage current between CEL and CS Package VSOP-8B Application For lithium-ion battery charge control Pin Assignment VSOP - 8B Lithium-Ion Battery Charge Control (1 cell) MM1438 D: Ta=0~40°C Output Output voltage voltage (V) temperature conditions 4.125±0.030 4.225±0.030 ±25mV/cell ±30mV/cell 250µ ...

Page 2

... Detects battery voltage and controls rated voltage to the prescribed voltage value. Current detection pin CS Input Detects current by drop in external resistor voltage and controls rated current. 8 Current value can be set at 0.1V/R1 typ. Lithium-Ion Battery Charge Control (1 cell) MM1438 I CHG = 0.2 Ω can be set set at 0.5A, R CHQ 1 ...

Page 3

... LV SINK I EXT V For no load EXT Ratings Unit -40~+125 °C -20~+70 °C -0.3~+18 V -0.3~+13 V -0.3~V +0 300 mW Ratings Unit -20~+70 °C 2.5~+17 V =5V, SW3 : A, SW6 : A, SW7 : A) Models listed MM1438A CC Min. Typ. Max. Unit 250 2 4.100 4.125 4.150 4.095 4.125 4.155 90 100 3.0 5.0 0.01 20 -0 2.0 2.15 20 -0 0.3 ...

Page 4

... MITSUMI Measuring Circuit Lithium-Ion Battery Charge Control (1 cell) MM1438 ...

Page 5

... Low voltage detection output leak current Low voltage detection output saturation voltage EXT pin inflow current EXT pin output voltage Lithium-Ion Battery Charge Control (1 cell) MM1438 (Except where noted otherwise, Ta=25°C, V Measurement Procedures 0V. Next, measure A5 current value Icc1 when V3 is changed CC from V 0V ...

Page 6

... MITSUMI MITSUMI Timing Chart V CC SW1 CEL CS LV CEL CS LV Application Circuit Lithium-Ion Battery Charge Control (1 cell) MM1438 Battery connection and SW1 OFF 0 OFF ON Rated voltage mode 0 Charging OFF Charging ON 100mV 0 Rated current mode Charging OFF Normal charging ...

Page 7

... EXT pin voltage vs EXT pin inflow current EXT pin inflow current (mA) Lithium-Ion Battery Charge Control (1 cell) MM1438 Output voltage vs Ambient temperature (Ta=25° pin voltage vs Ambient temperature (Ta=25° pin voltage vs Output voltage (Ta=25°C) ...

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