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| MITSUMI IC for Control of Lithium-ion Betteries Charging (one cell) MM1438 IC for Control of Lithium-ion Betteries Charging (one cell) 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. A low voltage circuit is built in (operates at SW2 = "L" ) that can prohibit low voltage battery (2.15V typ.) charging. When SW2 = "H", the low voltage circuit is turned off and even a low voltage battery can be charged. Series Table Temperature conditions A: Ta=-25~75C, B: Ta=-20~70C, C: Ta=0~50C, D: Ta=0~40C Package Output Full charge Over voltage Output voltage detection detection Remarks voltage (V) temperature voltage (mV) voltage (v) SOP-8C, 8E VSOP-8A, 8B TSOP-16A TSOP-24A conditions MM1438 AW BW 4.1250.030 4.2250.030 C C 1cell 1cell * Features 1. Charging voltage accuracy (Ta=25C) 2. Charging voltage accuracy (Ta=0 to 50C) 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 250A typ. 2A typ. 2.15V typ. 1A max. Package VSOP-8B Applications IC for control of lithium-ion batteries charging. Pin Assignment 1 2 8 7 6 5 3 4 1 2 3 4 5 6 VSOP-8B 7 8 GND LV SW2 SW1 VCC EXT CEL CS MITSUMI IC for Control of Lithium-ion Betteries Charging (one cell) MM1438 Block Diagram ICHG R2 Control *1 For example, if charging current (ICHQ) is set at 0.5A, R1 = 0.2 can be set. (VCL/ICHQ=0.1V/0.5A=R1) *2 Charging current can be controlled by varying resistance value with R1 and R2. Pin Description Pin No. Pin name 1 2 GND LV SW2 SW1 VCC EXT CEL I/O Input Output Input Input Input Output 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 ON/OFF control input pin for the IC SW1 = VCC: OFF, SW1 = GND: ON Power supply input pin Charging control output pin Battery voltage input pin 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. Controls external PNP-Tr to control charging. Pin Description 3 4 5 6 7 MITSUMI IC for Control of Lithium-ion Betteries Charging (one cell) MM1438 Absolute Maximum Ratings Item Storage temperature Operating temperature Power supply voltage CFL pin input voltage SW input voltage Allowable loss (Ta=25C) Symbol TSTG TOPR VCC max. VCEL max. VSW Pd Ratings -40~+125 -20~+70 -0.3~+18 -0.3~+13 -0.3~VCC+0.3 300 Unit C C V V V mW Recommended Operating Conditions Item Operating temperature Charging control operating voltage Symbol TOPR VOPR Ratings -20~+70 2.5~+17 Unit C V Note: Operating voltage minimum value is during rated current control. Electrical Characteristics (Except where noted otherwise, Ta=25C, VCC=5V, SW3 : A, SW6 : A, SW7 : A) Models listed MM1438A Max. Unit 400 A 10 A 4.150 V 4.155 V 110 mV 7.0 1 30 2.0 VCC+0.3 2.3 30 2.0 VCC+0.3 0.5 0.4 VCC-0.3 A A A V V V A V V A V mA V Item Symbol Measurement conditions Min. Typ. Consumption current 1 ICC1 VSW1=VSW2=0V (Charge : ON) 250 Consumption current 2 ICC2 VSW1=VSW2=VCC (Charge : OFF) 2 Output voltage 1 VO1 Ta=25C 4.100 4.125 Output voltage 2 VO2 Ta=0~50C 4.095 4.125 Current limit VCL 90 100 Inflow current between 3.0 5.0 ICEL1 CEL-CS during operation Leak current between CEL-CS ICEL2 VCC=0V or OPEN 0.01 SW1 input current ISW1 20 SW1 input voltage L VL1 Charge : ON -0.3 SW1 input voltage H VH1 Charge : OFF VCC-1.0 Low voltage detection voltage LV 2.0 2.15 SW2 input current ISW2 20 SW2 input voltage L VL2 Low voltage detection circuit: ON -0.3 SW2 input voltage H VH2 Low voltage detection circuit: OFF VCC-1.0 Low voltage detection ILV output leak current Low voltage detection ISINK=1mA 0.2 VLV output saturation voltage EXT pin inflow current IEXT 10 20 EXT pin output voltage VEXT For no load 0.3 Note 1: Please insert a capacitor of several F 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. MITSUMI IC for Control of Lithium-ion Betteries Charging (one cell) MM1438 Measuring Circuit MITSUMI IC for Control of Lithium-ion Betteries Charging (one cell) MM1438 Measurement Procedures 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 (Except where noted otherwise, Ta=25C, VCC=5V, SW3 : A, SW6 : A, SW7 : A) 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 10A. 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 10A; 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. 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 MITSUMI IC for Control of Lithium-ion Betteries Charging (one cell) MM1438 Timing Chart Battery connection and SW1: ON VCC 0 OFF SW1 0 ON OFF ON Rated voltage mode CEL 0 100mV Charging OFF Charging ON Normal charging CS 0 H 0 L Rated current mode LV CEL 0 Charging OFF CS 0 Battery low voltage (2V or less) LV 0 L (SW2 : L) Application Circuit MITSUMI IC for Control of Lithium-ion Betteries Charging (one cell) MM1438 Characteristics Output voltage vs Power supply voltage 4.15 (Ta=25C) Output voltage vs Ambient temperature 4.15 (VCC=5V) Output voltage (V) 4.10 Output voltage (V) 0 5 10 15 18 4.10 4.05 4.05 -25 0 25 50 75 Power supply voltage (V) Ambient temperature (C) CS pin voltage vs Power supply voltage 110 (Ta=25C) CS pin voltage vs Ambient temperature 110 (VCC=5V) CS pin voltage (mV) 105 100 95 90 CS pin voltage (mV) 0 5 10 15 18 105 100 95 90 -25 Power supply voltage (V) 0 25 50 75 Ambient temperature (C) LV pin voltage vs LV pin inflow current 5 (Ta=25C) CS pin voltage vs Output voltage 200 (Ta=25C,VCC=5V, at low voltage detection) 4 3 2 1 0 0 5 10 15 20 25 CS pin voltage (mV) LV pin voltage (V) 150 100 50 0 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 5 (Ta=25C,VCC=5V) EXT pin voltage (V) 4 3 2 1 0 0 5 10 15 20 25 30 EXT pin inflow current (mA) |
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