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 constant-
current 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
Pin Assignment
IC for control of lithium-ion batteries charging.
TSOP-24A
1
3
6
9
2
4 5
8
7
10
12
11
24
20
17
23
21
19 18
16
22
13
14
15
MITSUMI
1
CHGSW
13
BAT1
2
RESET
14
BAT2
3
TP1
15
CS
4
TP2
16
CFB
5
VREF
17
CNT
6
GND1
18
V
CC
7
GND2
19
ADJ5
8
ADJ1
20
V
OUT
9
ADJ2
21
LED G
10
ADJ3
22
LED R
11
ADJ4
23
OSC OUT
12
TDET
24
OSC FB-
MITSUMI
IC for Control of Lithium-ion Batteries Charging MM1433
MITSUMI
Block Diagram
MITSUMI
IC for Control of Lithium-ion Batteries Charging MM1433
Pin Description
Pin No. Pin name
I/O
Functions
Forced charging OFF pin
1
CHGSW
Input
L: Forced charging circuit ON (OFF for reset)
H: Charging stop is forced
Logic reset pin
2
RESET
Input
L: Forced charging circuit ON (start)
H: Forced charging circuit OFF
Test pin 1
Pre-charge timer test pin
3
TP1
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.)
Input/
Test pin 2
4
TP2
Output
Full charge timer test pin
Same structure as TP1
Reference power supply output pin
5
VREF
Output
Outputs 1.2V typ. reference voltage. Used for temperature detection reference
power supply and ADJ1 - ADJ4 adjustment.
6
GND1
Input
Ground pin.
7
GND2
Input
Ground pin.
8
ADJ1
Input
Overcurrent detection adjustment pin
Set so that overcurrent detection does not function. Pin voltage is 1.16V typ.
Full charge detection adjustment pin
9
ADJ2
Input
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
10
ADJ3
Input
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
12
TDET
Input
Apply potential resistance divided by external resistor and thermistor from
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.
17
CNT
Output
Charging control output pin
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 V
CC
overvoltage input: L
For V
CC
recommended operating voltage: H
21
LED G
Output
LED C control output pin
NPN-Tr open collector output. Refer to the flow chart for ON/OFF.
22
LED R
Output
LED R control output pin
NPN-Tr open collector output. Refer to the flow chart for ON/OFF.
Oscillator output pin
Timer setting time changes according to oscillation frequency.
23
OSC OUT
Output
Oscillation frequency is determined by an external resistor (connected between
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 130k
and
capacitor of 0.01F.
24
OSC FB-
Input
Oscillator inverted input pin
MITSUMI
IC for Control of Lithium-ion Batteries Charging MM1433
Pin Description
(The values below are average values)
Pin No.
Pin name
Equivalent circuit diagram Pin No.
Pin name
Equivalent circuit diagram Pin No.
Pin name
Equivalent circuit diagram
1
CHGSW
10
ADJ3
17
CNT
2
RESET
11
ADJ4
19
ADJ5
3
TP1
12
TDET
20
V
OUT
4
TP2
13
BAT1
21
LED G
5
VREF
14
BAT2
22
LED R
8
ADJ1
15
CS
23
OSC OUT
9
ADJ2
16
CFB
24
OSC FB-
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