MM1438 [MITSUMI]
IC for Control of Lithium-ion Betteries Charging; IC锂离子Betteries控制充电
| 型号： | MM1438 |
| 厂家： | 
MITSUMI ELECTRONICS, CORP. |
| 描述： | IC for Control of Lithium-ion Betteries Charging |
| 文件： | 总7页 (文件大小：143K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
IC for Control of Lithium-ion Betteries Charging MM1438
MITSUMI
IC for Control of Lithium-ion Betteries Charging
Monolithic IC MM1438
Outline
This IC is used to control charging of lithium-ion batteries consisting of a single cell. It is a modification of the
previous MM1332 charging-control IC, with improved charging voltage accuracy and a smaller package.
Features
1. Charging voltage accuracy (Ta=25°C)
2. Charging voltage accuracy (Ta=0 to 50°C)
3. Consumption current (charging on)
4. Consumption current (charging off)
5. Low-voltage detection
25mꢀVcell
30mꢀVcell
250µA typ.
2µA typ.
2.15ꢀ typ.
1µA max.
6. Leakage current between CEL and CS
Package
ꢀSOP-8B
Applications
IC for control of lithium-ion batteries charging.
Pin Assignment
1
2
3
4
5
6
7
8
GND
LV
8
1
7
2
6
3
5
4
SW2
SW1
VCC
EXT
CEL
CS
-
VSOP 8B
IC for Control of Lithium-ion Betteries Charging MM1438
MITSUMI
Block Diagram
Pin Description
Pin No. Pin name
I/O
Pin Description
1
GND
Input
Ground pin
Low voltage detection circuit output pin
ON with NPN-Tr open collector output at low voltage
Low voltage detection circuit ON/OFF control input pin
SW2 = VCC: OFF, SW2 = GND: ON
2
LV
Output
3
4
SW2
SW1
Input
ON/OFF control input pin for the IC
SW1 = VCC: OFF, SW1 = GND: ON
Input
Input
5
6
VCC
Power supply input pin
EXT
Output Charging control output pin Controls external PNP-Tr to control charging.
Battery voltage input pin
7
CEL
Input
Detects battery voltage and controls rated voltage to the prescribed voltage value.
Current detection pin
8
CS
Input
Detects current by drop in external resistor voltage and controls rated current.
Current value can be set at 0.1V/R1 typ.
IC for Control of Lithium-ion Betteries Charging MM1438
MITSUMI
(Ta=25°C)
Absolute Maximum Ratings
Item
Symbol
TSTG
Ratings
-40~+125
Unit
°C
°C
V
Storage temperature
Operating temperature
Power supply voltage
CFL pin input voltage
SW input voltage
TOPR
-
-
-
20~+70
0.3~+18
0.3~+13
VCC max.
VCEL max.
VSW
V
-
0.3~VCC+0.3
V
Allowable loss
Pd
300
mW
Recommended Operating Conditions
Item
Symbol
Ratings
Unit
°C
V
Operating temperature
Charging control operating voltage
TOPR
-20~+70
VOPR
2.5~+17
Note: Operating voltage minimum value is during rated current control.
(Except where noted otherwise, Ta=25°C, VCC=5V, SW3 : A, SW6 : A, SW7 : A)
Electrical Characteristics
Item
Symbol
Measurement conditions
VSW1=VSW2=0V (Charge : ON)
VSW1=VSW2=VCC (Charge : OFF)
Ta=25°C
Min. Typ. Max. Unit
Consumption current 1
Consumption current 2
Output voltage 1
ICC1
ICC2
VO1
VO2
VCL
250 400
10
4.100 4.125 4.150
4.095 4.125 4.155
µA
µA
V
2
Output voltage 2
Ta=0~50°C
V
Current limit
90
100 110 mV
Inflow current between
CEL-CS during operation
Leak current between CEL-CS
SW1 input current
ICEL1
3.0
5.0
7.0
µA
ICEL2
ISW1
VL1
VH1
LV
ISW2
VL2
VH2
VCC=0V or OPEN
0.01
20
1
30
2.0
CC+0.3
µA
µA
V
V
V
µA
V
V
SW1 input voltage L
SW1 input voltage H
Low voltage detection voltage
SW2 input current
Charge : ON
Charge : OFF
-0.3
V
CC
-0.1
V
2.0 2.15 2.3
20
30
2.0
CC+0.3
SW2 input current L
SW2 input current H
Low voltage detection
output leak current
Low voltage detection circuit: ON
Low voltage detection circuit: OFF
-0.3
V
CC
-1.0
V
ILV
0.5
0.4
µA
Low voltage detection
output saturation voltage
EXT pin inflow current
EXT pin output voltage
VLV
ISINK=1mA
0.2
20
V
IEXT
VEXT
10
0.3
mA
V
For no load
VCC-0.3
Note 1: Please insert a capacitor of several µF between power supply and ground when using.
Note 2: Be sure that CS pin potential does not fall below 0.5V.
-
Note 3: If the IC is damaged and control is no longer possible, its safety can not be guaranteed. Please
protect with something other than this IC.
IC for Control of Lithium-ion Betteries Charging MM1438
MITSUMI
Measuring Circuit
IC for Control of Lithium-ion Betteries Charging MM1438
MITSUMI
(Except where noted otherwise, Ta=25°C, VCC=5V, SW3 : A, SW6 : A, SW7 : A)
Measurement Procedures
Measurement Procedures
Item
V3 = VCC, V4 = 0V. Next, measure A5 current value Icc1 when V3 is changed
from VCC 0V.
Consumption current 1
Consumption current 2
Output voltage
V3 = Vd = VCC. Measure A6 current value ICC2 at this time.
V3 = VCC, V4 = 0V. Measure T7 voltage VO at this time.
V3 = Vcc, V4 = 0V. Set V7 voltage 1V lower than T7 (output voltage) potential
and set SW7 to B. Measure T8 voltage VCL at this time.
V3 = VCC, V4 = 0V, SW6: C. V7 = 4.5V, SW7: B. Measure A7 current value
ICEL1 at this time.
Current limit
Inflow current between
CEL-CS during operation
V3 = V4 = VCC = 0V, SW6: C. V7 = 4.5V, SW7: B. Measure A7 current value
ICEL2 at this time.
Leak current between CEL-CS
SW1 input current
Measure A4 current value ISW1 when V4 = 0V.
V3 = VCC. Charge: ON (VL1) when V4 potential is varied and T7 voltage is the
prescribed output voltage; Charge OFF (VH1) when 0 ~ 0.05V.
V3 = V4 = 0V. Set V7 voltage 1V lower than T7 (output voltage) potential, and
SW7: B.
SW1 input voltage
L
ow voltage detection voltage
Next gradually lower V7 voltage; V7 voltage is LV when A7 current value is
within 10ꢀA.
SW2 input current
SW2 input voltage
Measure A3 current value ISW2 when V3 = 0V.
V4 = 0V, V7 = 1V, SW7: B. Low voltage detection circuit: ON (VL2) when V3
voltage is varied and A7 current value is within 10ꢀA; low voltage detection
circuit: OFF (VH2) otherwise.
Low voltage detection
output leak current
V3 = VCC, V4 = 0V. Measure A2 current value ILV when V3 is changed from
Vcc 0V.
Low voltage detection
V3 = V4 = 0V. SW3: B, SW7: B. Measure T2 voltage VLV when V7 voltage is 0V.
output saturation voltage
EXT pin inflow current
EXT pin output voltage
V3 = V4 = 0V. SW6: B, SW7: B, V6 = 4V, V7 = 3V. Measure A6 current value IEXT
V3 = V4 = 0V. SW6: C, SW7: B. T6 voltage when V7 = 3V and V7 = 5V is VEXT
.
.
IC for Control of Lithium-ion Betteries Charging MM1438
MITSUMI
Timing Chart
Battery connection and SW1: ON
VCC
0
ON
OFF
SW1
0
ON
OFF
Rated voltage mode
CEL
0
Charging OFF
Charging ON
100mV
0
Normal charging
CS
LV
Rated current mode
H
L
0
CEL
CS
0
Charging OFF
Battery low voltage
(2V or less)
0
LV
L
0
(SW2 : L)
Application Circuit
IC for Control of Lithium-ion Betteries Charging MM1438
Output voltage vs Ambient temperature
MITSUMI
Characteristics
Output voltage vs Power supply voltage
(Ta=25°C)
(VCC=5V)
4.15
4.15
4.10
4.05
4.10
4.05
0
5
10
15
18
-25
0
25
50
75
Power supply voltage (V)
Ambient temperature (°C)
CS pin voltage vs Power supply voltage
CS pin voltage vs Ambient temperature
(Ta=25°C)
(VCC=5V)
110
110
105
100
95
105
100
95
90
90
-
0
5
10
15
18
25
0
25
50
75
Power supply voltage (V)
Ambient temperature (°C)
LV pin voltage vs LV pin inflow current
CS pin voltage vs Output voltage
(Ta=25°C)
(Ta=25°C,VCC=5V, at low voltage detection)
5
200
150
100
50
4
3
2
1
0
0
0
5
10
15
20
25
2
2.1
2.2
2.3
2.4
2.5
LV pin inflow current (mA)
Output voltage (V)
EXT pin voltage vs EXT pin inflow current
(Ta=25°C,VCC=5V)
5
4
3
2
1
0
0
5
10
15
20
25
30
EXT pin inflow current (mA)
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