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PDF MM1438 Data sheet ( Hoja de datos )
| Número de pieza | MM1438 | |
| Descripción | IC for Control of Lithium-ion Betteries Charging | |
| Fabricantes | ETC | |
| Logotipo |  |
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MITSUMI
IC for Control of Lithium-ion Betteries Charging MM1438
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
6. Leakage current between CEL and CS
±25mV/cell
±30mV/cell
250µA typ.
2µA typ.
2.15V typ.
1µA max.
Package
VSOP-8B
Applications
IC for control of lithium-ion batteries charging.
Pin Assignment
8765
1234
VSOP-8B
1 GND
2 LV
3 SW2
4 SW1
5 VCC
6 EXT
7 CEL
8 CS
1 page  
MITSUMI
IC for Control of Lithium-ion Betteries Charging MM1438
Measurement Procedures (Except where noted otherwise, Ta=25°C, VCC=5V, SW3 : A, SW6 : A, SW7 : A)
Item
Consumption current 1
Consumption current 2
Output voltage
Current limit
Inflow current between
CEL-CS during operation
Leak current between CEL-CS
SW1 input current
SW1 input voltage
Low voltage detection voltage
SW2 input current
SW2 input voltage
Low voltage detection
output leak current
Low voltage detection
output saturation voltage
EXT pin inflow current
EXT pin output voltage
Measurement Procedures
V3 = VCC, V4 = 0V. Next, measure A5 current value Icc1 when V3 is changed
from VCC 0V.
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.
V3 = V4 = VCC = 0V, SW6: C. V7 = 4.5V, SW7: B. Measure A7 current value
ICEL2 at this time.
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.
Next gradually lower V7 voltage; V7 voltage is LV when A7 current value is
within ±10µA.
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 ±10µA; low voltage detection
circuit: OFF (VH2) otherwise.
V3 = VCC, V4 = 0V. Measure A2 current value ILV when V3 is changed from
Vcc 0V.
V3 = V4 = 0V. SW3: B, SW7: B. Measure T2 voltage VLV when V7 voltage is 0V.
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.
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet MM1438.PDF ] | |
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