MITSMI MM1433 Datasheet
MITSUMI
TSOP-24A
136924587101211
24 20 1723 21 19 18 1622 131415
MITSUMI
IC for Control of Lithium-ion Batteries Charging MM1433
IC for Control of Lithium-ion Batteries Charging
Monolithic IC MM1433
Outline
This IC is used to control charging of lithium-ion batteries. This one IC incorporates functions for constantcurrent and constant-voltage charging and for precharging, for an overcharge timer, battery temperature
detection, and other protective functions. It was developed by adding to the previous MM1332 and 1333 the
above-described functions.
Features
1. Charging voltage accuracy ±30mV/cell.
2. Consumption current 5mA typ.
3. Precharge function.
4. Recharge function.
5. Overcharge timer.
6. Battery temperature detection function.
7. We can supply type for one and two cells.
Package
TSOP-24A
Applications
IC for control of lithium-ion batteries charging.
Pin Assignment
1 CHGSW 13 BAT1
2 RESET 14 BAT2
3 TP1 15 CS
4 TP2 16 CFB
5 VREF 17 CNT
6 GND1 18 V
7 GND2 19 ADJ5
8 ADJ1 20 V
9 ADJ2 21 LED G
CC
OUT
10 ADJ3 22 LED R
11 ADJ4 23 OSC OUT
12 TDET 24 OSC FB
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MITSUMI
MITSUMI
Block Diagram
IC for Control of Lithium-ion Batteries Charging MM1433
MITSUMI
Pin Description
IC for Control of Lithium-ion Batteries Charging MM1433
Pin No.
Pin name
1 CHGSW Input L: Forced charging circuit ON (OFF for reset)
2 RESET Input L: Forced charging circuit ON (start)
3 TP1
4 TP2
5 VREF Output Outputs 1.2V typ. reference voltage. Used for temperature detection reference
I/O Functions
Forced charging OFF pin
H: Charging stop is forced
Logic reset pin
H: Forced charging circuit OFF
Test pin 1
Pre-charge timer test pin
Input/ Inverts while counting (the middle stage of the several FF stages) and output to
TP1, to permit monitoring.Output
Also, TP1 output signal is inverted again inside the IC and inputs to the next stage
FF. (Timer setting is done by binary counter.)
Test pin 2
Input/
Full charge timer test pin
Output
Same structure as TP1
Reference power supply output pin
power supply and ADJ1 - ADJ4 adjustment.
6 GND1 Input Ground pin.
7 GND2 Input Ground pin.
8 ADJ1 Input
9 ADJ2 Input
10 ADJ3 Input
Overcurrent detection adjustment pin
Set so that overcurrent detection does not function. Pin voltage is 1.16V typ.
Full charge detection adjustment pin
Pin voltage is set at 93mV typ. Full charge detection value can be changed by
adjusting pin voltage with an external resistor, etc.
Full charge detection is done by comparing ADJ2 pin voltage and 12dB voltage
drop value between CS and BAT.
Pre-charge current adjustment pin
Pin voltage is set at 120mV typ. Pre-charge current can be changed by adjusting
pin voltage with an external resistor, etc.
Pre-charge current control is done by comparing ADJ3 pin voltage and 12dB
voltage drop value between CS and BAT.
Full charge current adjustment pin
Pin voltage is set at 0.89mV typ. Full charge current can be changed by adjusting
pin voltage with an external resistor, etc.
11 ADJ4 Input Full charge current control is done by comparing ADJ4 pin voltage and 12dB
voltage drop value between CS and BAT.
When full charge current is controlled to rated current by an adapter, short ADJ4
pin and VREF pin so that rated current control does not function in the IC.
MITSUMI
IC for Control of Lithium-ion Batteries Charging MM1433
Pin No.
Pin name
I/O Functions
Temperature detection input pin
Apply potential resistance divided by external resistor and thermistor from
12 TDET Input
reference voltage when using. Reset state will exist if TDET pin does not reach
the specified potential.
13 BAT1 Input Battery voltage input pins
14 BAT2 Input Detect battery voltage and control charging.
Current detection pin
15 CS Input Detects current by external resistor (between CS and BAT) voltage drop and
controls charging current.
Rated current control phase compensation pin
16 CFB Input Oscillation is improved by connecting an external capacitor (around 100pf)
between CFB and CNT for phase compensation.
Charging control output pin
17 CNT Output
Controls external PNP-Tr base for rated current rated voltage charging.
18 V
CC Input Power supply input pin
Rated voltage control adjustment pin
19 ADJ5
Input
Allows fine adjustment of rated voltage value. For example, rated voltage value
rises by around 15mV (at 4.1V typ.) when ADJ5-GND is shorted.
Overvoltage detection output pin
20 V
OUT Output For VCC overvoltage input: L
For V
CC recommended operating voltage: H
LED C control output pin
21 LED G Output
NPN-Tr open collector output. Refer to the flow chart for ON/OFF.
LED R control output pin
22 LED R Output
NPN-Tr open collector output. Refer to the flow chart for ON/OFF.
Oscillator output pin
Timer setting time changes according to oscillation frequency.
Oscillation frequency is determined by an external resistor (connected between
23
OSC OUT
Output
OSC OUT and OSC FB) and capacitor (connected between OSC FB and GND).
For example, the full charge timer setting is 4H for external resistor of 130kΩ and
capacitor of 0.01µF.
24
OSC FB-Input Oscillator inverted input pin
MITSUMI
IC for Control of Lithium-ion Batteries Charging MM1433
Pin Description
Pin No.
Pin name
1 CHGSW 10 ADJ3 17 CNT
2 RESET 11 ADJ4 19 ADJ5
3 TP1 12 TDET 20 V
(The values below are average values)
Equivalent circuit diagram
Pin No.
Pin name
Equivalent circuit diagram
Pin No.
Pin name
OUT
Equivalent circuit diagram
4 TP2 13 BAT1 21 LED G
5 VREF 14 BAT2 22 LED R
8 ADJ1 15 CS 23
9 ADJ2 16 CFB 24
OSC OUT
OSC FB
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