MITSMI MM1333 Datasheet

MITSUMI

Control for Lithium Ion Battery Charging (one cell) MM1333

Control for Lithium Ion Battery Charging (one cell)

Monolithic IC MM1333

Outline

This IC was developed for use in charging lithium ion batteries. A power transistor or P-MOS FET is mounted externally to control charging. This IC is for use with a single cell only, and provides precise control of the charging voltage ; the charging current can be set through an external resistance. In addition to the functions of the MM1332, it incorporates a comparator for full-charge detection.

Features

1. Output voltage (Ta=25°C) 4.100V±35mV

2. Output voltage (Ta=

20°C~+70°C) 4.100V±50mV

3. Constant-current output Current limit 100mV±10mV Constant current value = current limit/external resistance

4. Low-voltage (LV) detection function 2.00V±100mV

5. Full-charge detection function Detection voltage 31mV±5mV

Package

SOP-8C

Applications

1. Lithium ion battery chargers

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Block Diagram

MITSUMI

Control for Lithium Ion Battery Charging (one cell) MM1333

Pin Assignment

Pin Description

Values given are standard

1432

8567

SOP-8C

1 SW

2 CO

3 GND

4 CS2

5 CS1

6 CEL

7 EXT

8 V

Pin no. Pin name

Input/output

Function

1 SW Input

Input pin for on/off control SW=V

CC : off, SW=GND : on

Pulled up to V

CC, so turned off when open

Full-charge signal output pin While charging : Open collector output NPN transistor is off At full charge : Open collector output NPN transistor is on

2 CO output

GROUND pin

3 GND Input

Full charge detection pin The current is detected through the voltage drop across an external resistance, to control the full-charge signal. The ratio of the charge current set by CS1 and the current at full-charge signal output is (VIC)/(0.1 V R4/(R3+R4))

4 CS2 Input

Current detection pin The current is detected through the voltage drop across an external resistance, to maintain a constant current. The current value can be set using

0.1 V/(R3+R4).

5 CS1 Input

6 CEL Input

Battery voltage input pin The battery voltage is detected and used to maintain the voltage at the prescribed value. A low-voltage detection circuit is also present, and charging is forbidden when the battery voltage is less than 2V. Constant-voltage circuit output pin The base of an external PNP transistor or gate of a P-ch FET is controlled in constant-voltage charging.

7 EXT Output

8 V

CC Input

Power supply input pin

Absolute Maximun Ratings

(Ta=25°C)

Item Symbol Ratings Units

Storage temperature T

STG

40~+125 °C

Operating temperature T

OPR

20~+70 °C

Power supply voltage V

CC max.

0.3~+13 V

Output voltage V

O max.

0.3~VCC V

SW input voltage V

0.3~VCC+0.3 V

Allowable loss Pd 300 mW

MITSUMI

Control for Lithium Ion Battery Charging (one cell) MM1333

Recommended Operating Conditions

Electrical Characteristics

(Except where noted otherwise, Ta=25°C, VCC=5V, SW2, 4, 6, 7 : A)

MITSUMI

Item Symbol Ratings Units

Operating temperature T

OPR

20~+70 °C

Operating voltage V

OPR +5~+12 V

Item Symbol Measurement conditions Min. Typ. Max. Units

Consumption current 1 I

CC1 VSW=0V (Charge : ON) 300 400 µA

Consumption current 2 I

CC2 VSW=0V (Charge : ON) 1.1 1.6 mA

Consumption current 3 I

CC3 VSW=VCC (Charge : OFF) 2 4 µA

Output voltage 1 V

O1 Ta=25°C 4.065 4.100 4.135 V

Output voltage 2 V

O2 Ta=0~+40°C 4.050 4.100 4.150 V

Output voltage temperature drift V

O Ta=

20~+70°C ±0.25

°C

Current limit V

CL 90 100 110 mV

CEL-CS leakage current I

CEL 1µA

SW input current I

SW 20 µA

SW input voltage

L Charge : ON

0.3 2.0 V

H Charge : OFF

VCC-

1.0 VCC+0.3

Low-voltage detection voltage L

V 1.90 2.00 2.10 V

EXT pin input voltage I

S 10 20 mA

EXT pin output voltage V

EXT No load 0.3

VCC-

0.3

Full-charge detection voltage V

IC 26 31 36 mV

Full-charge detection output L V

COL ISINK=0.3mA 0.2 0.4 V

Full-charge detection

output leakage current

CO 1µA

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