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MITSUMI
Lithium Ion Battery Charging Control (microcomputer-controlled type) (one cell) MM1475
Lithium Ion Battery Charging Control (microcomputer-controlled type) (one cell)
Monolithic IC MM1475
Outline
This IC is a lithium ion battery charging control IC. It is a 1-chip charging IC that combines constant current, constant voltage charging and protection circuits such as pre-charge and pre-charge timer battery temperature detection, all in one. The quick charge timer and full charge detection function have been eliminated, as compared to MM1433, and charging ON/OFF is controlled externally.
Features
1. Output voltage (Ta = 0C ~ +50C) 4.120 30mV 2. Consumption current 3.5mA typ. 3. Pre-charge function 4. Adaptor (primary side) abnormality detection function 5. Timer error time 10% (not including external deviation) 6. Battery temperature detection function 7. Pre-charge timer
Package
TSOP-24A
Applications
1. Lithium ion battery charging control (with timer)
Pin Assignment
1 2 3 4 5 6 7 8 9 10 11 12 SW1 SW2 TP1 N.C VREF GND1 GND2 N.C ADJ1 CDO TOUT TDET 13 14 15 16 17 18 19 20 21 22 23 24 BAT CS CS+ CFB CNT VCC VOUT2 VOUT1 VDET-TD N.C OSC OUT OSC FB-
24 23 22 21 20 19 18 17 16 15 14 13
1 2 3 4 5 6 7 8 9 10 11 12 TSOP-24A
MITSUMI
Lithium Ion Battery Charging Control (microcomputer-controlled type) (one cell) MM1475
Block Diagram
SW1 L H L H
SW2 H H L L
Charging OFF ON ON ON
Current limit Controlled by this IC (Current limit 2: 25mV) Controlled by adaptor (Current limit 1: 450mV) Controlled by adaptor (Current limit 1: 450mV)
Timer OFF ON OFF OFF
MITSUMI
Lithium Ion Battery Charging Control (microcomputer-controlled type) (one cell) MM1475
Pin Description
Pin No. 1 2 Pin name SW1 SW2 I/O Function Function
Charge control switching pin. Input Switches charging ON/OFF and switches charging current by combinations Input of SW1 and SW2 high and low. Test pin 1. Pre-charge timer test pin. Inverts during counting (from the middle stage of the several-staged FF) and Input/output outputs on TP1 for monitoring. Also inverts TP1 output signal again inside the IC and inputs to the next stage FF. (Timer setting done by binary counter.) Reference power supply output pin. Output Outputs 1.2V typ. reference voltage.
3
TP1
5 6 7
VREF GND1 GND2
Input Input
Ground pin. Ground pin. Pre-charge current adjustment pin. Pin voltage is set at 100mV typ.. Pre-charge current can be changed by adjusting pin voltage with an external resistor. Pre-charge current is controlled by comparing ADJ1 pin voltage and the 12dB voltage drop value between CS + and CS -. Current detection output pin. Outputs voltage difference of 18dB between CS+ and CS -. Temperature detection output pin. Normal temperature: Output Tr OFF When high temperature is detected: Output Tr ON Temperature detection input pin. Be sure to apply the potential obtained by resistance dividing, from reference voltage, with an external resistor and thermistor. Battery voltage input pin. Detects battery voltage and controls charging. Current detection pin. Detects current by voltage drop at external resistor between (CS+) and (CS -) and controls charging current. Rated current control phase compensation pin. Oscillation is improved by connecting an external capacitor (around 100pF) between CFB and CNT to perform phase compensation. Charging control output pin. Controls base of external PNP-Tr for rated current rated voltage charging. Power supply input pin. Adapter unplugged detection output pin. VCC low voltage input: Output Tr OFF VCC recommended operating voltage: Output Tr ON Overvoltage detection output pin. VCC overvoltage input: Output Tr OFF VCC recommended operating voltage: Output Tr ON Overvoltage detection delay time setting pin. Delay time is set by connecting an external capacitor. Oscillator output pin. Timer setting time changes according to oscillation frequency. Oscillation frequency is determined by the external resistor (connected between OSC OUT and OSC FB) and capacitor (connected between OSC FB and GND). Oscillator inverted input pin.
9
ADJ1
Input
10 11
CDO TOUT TDET BAT CS CS+ CFB CNT VCC VOUT2 VOUT1 VDET-TD OSC OUT OSC FB -
Output Output Input Input Input Input Input Output Input Output Output Input Output Input
12 13 14 15 16 17 18 19
20 21
23 24
MITSUMI
Lithium Ion Battery Charging Control (microcomputer-controlled type) (one cell) MM1475
Pin Description
Pin No. Pin name 1 SW1
The following valaeis typical Internal equivalent circuit diagram Pin No. Pin name 11 TOUT Internal equivalent circuit diagram
12
TDET
2
SW2
13
BAT
3
TP1
14
CS -
4 5
NC VREF 15 CS +
16 8 9 NC ADJ1
CFB
17
CNT
10
CDO
19
VOUT2
MITSUMI
Lithium Ion Battery Charging Control (microcomputer-controlled type) (one cell) MM1475
Pin No. Pin name 20 VOUT1
Internal Equivalent Circuit Diagram Pin No. Pin name 22 23 NC OSC OUT
Internal Equivalent Circuit Diagram
21
VDET-TD
24
OSC FB -
Absolute Maximum Ratings
Item Storage temperature Operating temperature Power supply voltage Allowable loss
(Ta=25C) Symbol TSTG TOPR VCCmax. Pd Rating -40~+125 -20~+70 -0.3~+15 250 Unit C C V mW
Recommended Operating Conditions
Item Operating temperature Charging control operating voltage Symbol TOPR VOPR Rating -20~+70 3.0~5.8 Unit C V
MITSUMI
Lithium Ion Battery Charging Control (microcomputer-controlled type) (one cell) MM1475
Electrical Characteristics
Item Consumption current 1 Consumption current 2 Reference voltage ADP detection voltage L ADP detection voltage L Hysteresis voltage width ADP detection voltage H ADP detection voltage H Hysteresis voltage width BAT pin leak current BAT pin output voltage CNT pin output voltage SW1 pin input current SW1 pin input voltage H SW1 pin input voltage L SW2 pin input current SW2 pin input voltage H SW2 pin input voltage L Current limit 1 Current limit 2 Current detection amp gain Current detection amp input offset voltage Current detection amp output current VOUT1 pin output voltage VOUT2 pin output voltage Battery temperature detection voltage Battery temperature detection voltage hysteresis voltage width TOUT pin output voltage TDET input bias current Timer error time
(Except where otherwise indicated: Ta = 25C, VCC = 5V) Measurement conditions SW1, 2 : H SW1, 2 : L VCC : H L Measurement pin Min. Typ. Max. Unit 18 18 5 19 19 VCC : L H 20 20 13 Ta=0~+50C ICNT=20mA 13 17 1 1 1 2 2 2 Rapid Charging Preliminary Charging 14, 15 14, 15 10 10 10 IOUT1=0.12mA IOUT2=0.12mA VTDET : H L 20 19 11 0.35 20 17.5 -4.5 0.5 0.45 25 18.0 0 1.0 0.2 0.2 0.4 0.4 40 0.6 60 40 0.6 60 2.70 50 5.8 50 3.5 5.5 1.207 2.80 100 6.0 100 2.90 150 6.2 150 1 4.090 4.120 4.150 0.5 80 1.20 0.25 80 1.20 0.25 0.55 30 18.5 4.5 5.0 7.7 mA mA V V mV V mV A V V A V V A V V V mV dB mV mA V V V
Symbol ICC1 ICC2 VREF VADPL VADPLW VADPH VADPHW IBAT VBAT VCNT ISW1 VSW1H VSW1L ISW2 VSW2H VSW2L VL1 VL2 GI VOFF ICDO VOUT1 VOUT2 VTDET
0.390 0.413 0.435
VTDETW VTOUT IT T Excluding Dispersion ITOUT=0.12mA
11 11 12 17
30
60 0.2 30
90 0.4 150 10
mV V nA %
-10
Current limit are prescribed detection resistor voltage drop range. *If the control 1 and 2 IC fails to work,by the current not be guaranteed. Please protect with something other its safety can *than this IC. on this
*Please use a capacitor with good temperature characteristics in the OSC section. causes timer error.
Capacitor deviation
MITSUMI
Lithium Ion Battery Charging Control (microcomputer-controlled type) (one cell) MM1475
Reference Materials on OSC CR Setting (1) OSC CR - Oscillation cycle T Table
R C 0.0047 0.0082 0.01 0.015 0.022 75k 0.47ms 0.83ms 1.03ms 1.48ms 2.16ms 100k 0.63ms 1.10ms 1.37ms 1.98ms 2.87ms 120k 0.75ms 1.32ms 1.63ms 2.38ms 3.44ms 130k 0.82ms 1.43ms 1.77ms 2.58ms 3.73ms 150k 0.94ms 1.65ms 2.04ms 2.97ms 4.30ms 200k 1.26ms 2.20ms 2.73ms 3.95ms 5.76ms
(2) Timer Times
Item Pre-charge timer Formula T 219 Example (for C = 0.01, R = 130k) 15M28s
T: OSC oscillation cycle
Measuring Circuit
MITSUMI
Lithium Ion Battery Charging Control (microcomputer-controlled type) (one cell) MM1475
Measurement method
Item Consumption current 1 Consumption current 2 Reference voltage ADP detection voltage L ADP detection voltage L Hysteresis voltage width ADP detection voltage H ADP detection voltage H Hysteresis voltage width BAT pin leak current BAT pin output voltage CNT pin output voltage SW1 pin input current SW1 pin input voltage H SW1 pin input voltage L SW2 pin input current SW2 pin input voltage H SW2 pin input voltage L Current limit 1 Current limit 2
(Except where otherwise indicated, Ta = 25C, Vcc = 5V, VCC : current limit 0.5A, V1 = V2 = 0V, V13 = 4.2V, S10, 11, 12, 17, 19, 20, 24:A, timer time is not up) Measurement method Measure A18 current value ICC1 when V1 = V2 = 1.2V. Measure A18 current value ICC2. Measure T5 potential VREF. Gradually lower VCC from 5V. VCC potential when T19 potential goes over VCC 0.5V is VADPL. Gradually lower VCC from 2V. VCC potential when T19 potential drops below 0.5V is VADPL2. VADPLW=VADPL2-VADPL Gradually raise VCC from 5V. VCC potential when T20 potential goes over VCC 0.5V is VADPH. Gradually lower VCC from 7V. VCC potential when T20 potential drops below 0.5V is VADPH2. VADPHW=VADPH-VADPH2 Measure A13 current value IBAT when VCC = 0V, S17: B, V17 = 0V. Gradually raise V13 from 3.5V. T13 potential when T15-T14 potential difference is 20mV or less is VBAT. Gradually raise V17 from 0V when V13 = 3.5V and S17: B. T17 potential when A17 current value reaches 20mA is VCNT. Measure A1 current value ISW1. Change V1 from 0V to 1.2V when V13 = 3.5V and V2 = 1.2V. To identify VSW1 H and L, when A13 is over 50mA, charging is ON at current limit 2, and when A13 is 1mA or under, charging is OFF. Measure A2 current value ISW2. Change V2 from 0V to 1.2V when V13 = 3.5V. To identify VSW2 H and L, when A13 is over 450mA, charging is ON at current limit 1, and when A13 is 1mA or under, charging is OFF. Gradually raise VCC current limit value when V13 = 3.5V, and measure T15 -T14 potential difference VL1. V13 = 2.5V, V1 = V2 = 1.2V, and T15-T14 potential difference is VL2. T15-T14 potential difference fluctuation is Va and T10 potential fluctuation is Vb when V13 = 3.5V and VCC current limit value is changed from 100mA to 200mA. GI=20log Vb/ Va T10 potential is Vb2 when V13 = 4.0V and VCC current limit value is 100mA. VOFF=Vb2/8-30mV Measure A10 current value when V13 = 3.5V, VCC current limit value is 300mA, S10: B and V10 = 0V. Gradually raise V20 from 0V when S20: B. T20 potential when A20 current value is 0.12mA is VOUT1. Gradually raise V19 from 0V when S19: B. V19 potential when A19 current value is 0.12mA is VOUT2. At S12:B, lower gradually from V12 = 0V. T12 potential is VTDET when T11 potential falls below 0.3V. At S12:B, lower gradually fromV12 = 0V. T12 potential is VTDET2 when T11 potential goes above 0.8V. VTDETW = VTDET2 - VTDET Raise V11 gradually from 0V when S12:B, V12 = 0V, S11:B. T11 potential is VTOUT when A11 current value is 0.12mA. Measure A12 current value IT for S12:B, V12 = 0V.
Current detection amp gain
Current detection amp input offset voltage Current detection amp output current VOUT1 pin output voltage VOUT2 pin output voltage Battery temperature detection voltage Battery temperature detection voltage hysteresis voltage width TOUT pin output voltage TDET input bias current
MITSUMI
Lithium Ion Battery Charging Control (microcomputer-controlled type) (one cell) MM1475
Timing Chart
When charging is performed normally
VCC : ON Start VCC 5V 0V 4.1V BAT pin voltage 3V 2V
Charging current 0A
Full charge Pre-charging H L H
SW1
SW2
L
Pre-Charging Time Up
VCC : ON Start VCC 5V 0V BAT pin voltage 0V
Time up Charging current 0A Pre-charging H SW1 L H SW2
MITSUMI
Lithium Ion Battery Charging Control (microcomputer-controlled type) (one cell) MM1475
Application Circuit
MITSUMI
Lithium Ion Battery Charging Control (microcomputer-controlled type) (one cell) MM1475
Characteristics
Current Limit 1 vs Ambient temperature
0.6 0.55 0.5 0.45 0.4 0.35 0.3 -25 0 25 50 75
Current Limit 2 vs Ambient temperature
50
Current Limit 2 (mV)
Current Limit 1 (V)
40 30 20 10 0 -25
0
25
50
75
Ambient temperature (C)
Ambient temperature (C)
BAT Pin Output Voltage vs Ambient temperature
BAT Pin Output Voltage (V)
4.15 4.14 4.13 4.12 4.11 4.10 4.09 4.08 4.07 4.06 4.05 -25 When VBAT=4.12V
Current Detection Input/Output
CDO Output Voltage (V)
2.5 2 1.5 1 0.5 0 0 50 100 150 200 250 300 Ta=25C
0
25
50
75
Ambient temperature (C)
Potential Difference between (CS+) and (CS-) (mV)
VCNT Voltage vs ICNT Current
0.5 Ta=25C
BAT Pin Reverse Current vs BAT Pin Voltage
BAT Reverse Current (A)
0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5
VCNT Voltage (V)
0.4 0.3 0.2 0.1 0 1 10 100
ICNT Current (mA)
BAT Pin Voltage (V)
OSC Oscillation Cycle vs CR
Oscillation cycle (ms)
6 C=0.022F 5 4 3 2 1 0 100 120 140 160 180 200 C=0.0047F C=0.01F Ta=25C
ADP Detection H Delay Time
ADP Detection H Delay Time (ms)
20 15 10 5 0 0 0.02 0.04 0.06 0.08 0.1 when Ta = 25C, Vcc = 0 6.5V
OSC Resistance R (k)
Capacitance between (VDET-TD) and GND (F)

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