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
Applications
1. Lithium ion battery charging control (with timer)
Pin Assignment
1
3
6
9
2
4 5
8
7
10
12
11
24
20
17
23
21
19 18
16
22
13
14
15
TSOP-24A
1
SW1
13
BAT
2
SW2
14
CS -
3
TP1
15
CS+
4
N.C
16
CFB
5
VREF
17
CNT
6
GND1
18
V
CC
7
GND2
19
V
OUT
2
8
N.C
20
V
OUT
1
9
ADJ1
21
VDET-TD
10
CDO
22
N.C
11
T
OUT
23
OSC OUT
12
TDET
24
OSC FB -
MITSUMI
Lithium Ion Battery Charging Control (microcomputer-controlled type) (one cell) MM1475
Block Diagram
SW1
SW2
Charging
Current limit
Timer
L
H
OFF
OFF
H
H
ON
Controlled by this IC (Current limit 2: 25mV)
ON
L
L
ON
Controlled by adaptor (Current limit 1: 450mV)
OFF
H
L
ON
Controlled by adaptor (Current limit 1: 450mV)
OFF
MITSUMI
Lithium Ion Battery Charging Control (microcomputer-controlled type) (one cell) MM1475
Pin Description
Pin No.
Pin name
I/O Function
Function
1
SW1
Input
Charge control switching pin.
Switches charging ON/OFF and switches charging current by combinations
of SW1 and SW2 high and low.
2
SW2
Input
3
TP1
Input/output
Test pin 1.
Pre-charge timer test pin.
Inverts during counting (from the middle stage of the several-staged FF) and
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.
Outputs 1.2V typ. reference voltage.
5
VREF
Output
6
GND1
Input
Ground pin.
Ground pin.
7
GND2
Input
9
ADJ1
Input
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 -.
10
CDO
Output
Current detection output pin.
Outputs voltage difference of 18dB between CS+ and CS -.
11
T
OUT
Output
Temperature detection output pin.
Normal temperature: Output Tr OFF
When high temperature is detected: Output Tr ON
12
TDET
Input
Temperature detection input pin.
Be sure to apply the potential obtained by resistance dividing, from reference
voltage, with an external resistor and thermistor.
13
BAT
Input
Battery voltage input pin.
Detects battery voltage and controls charging.
16
CFB
Input
Rated current control phase compensation pin.
Oscillation is improved by connecting an external capacitor (around 100pF)
between CFB and CNT to perform phase compensation.
14
CS -
Input
15
CS+
Input
Current detection pin.
Detects current by voltage drop at external resistor between (CS+) and (CS -)
and controls charging current.
17
CNT
Output
Charging control output pin.
Controls base of external PNP-Tr for rated current rated voltage charging.
18
V
CC
Input
Power supply input pin.
19
V
OUT
2
Output
Adapter unplugged detection output pin.
V
CC
low voltage input: Output Tr OFF
V
CC
recommended operating voltage: Output Tr ON
20
V
OUT
1
Output
Overvoltage detection output pin.
V
CC
overvoltage input: Output Tr OFF
V
CC
recommended operating voltage: Output Tr ON
21
VDET-TD
Input
Overvoltage detection delay time setting pin.
Delay time is set by connecting an external capacitor.
23
OSC OUT
Output
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).
24
OSC FB -
Input
Oscillator inverted input pin.
MITSUMI
Lithium Ion Battery Charging Control (microcomputer-controlled type) (one cell) MM1475
Pin Description
The following valaeis typical
Pin No. Pin name
Internal equivalent circuit diagram
Pin No. Pin name
Internal equivalent circuit diagram
1
SW1
12
TDET
13
BAT
2
SW2
3
TP1
5
VREF
4
NC
8
NC
9
ADJ1
10
CDO
11
T
OUT
14
CS -
15
CS +
16
CFB
17
CNT
19
V
OUT
2
MITSUMI
Lithium Ion Battery Charging Control (microcomputer-controlled type) (one cell) MM1475
Pin No. Pin name
Internal Equivalent Circuit Diagram
Pin No. Pin name
Internal Equivalent Circuit Diagram
20
V
OUT
1
21
VDET-TD
22
NC
23
OSC OUT
24
OSC FB -
Absolute Maximum Ratings
(Ta=25C)
Recommended Operating Conditions
Item
Symbol
Rating
Unit
Storage temperature
T
STG
-40~+125
C
Operating temperature
T
OPR
-20~+70
C
Power supply voltage
V
CC
max.
-0.3~+15
V
Allowable loss
Pd
250
mW
Item
Symbol
Rating
Unit
Operating temperature
T
OPR
-20~+70
C
Charging control operating voltage
V
OPR
3.0~5.8
V
MITSUMI
Lithium Ion Battery Charging Control (microcomputer-controlled type) (one cell) MM1475
Electrical Characteristics
(Except where otherwise indicated: Ta = 25C, V
CC
= 5V)
Item
Symbol
Measurement conditions
Measurement pin Min. Typ. Max. Unit
Consumption current 1
I
CC1
SW1, 2 : H
18
3.5
5.0
mA
Consumption current 2
I
CC2
SW1, 2 : L
18
5.5
7.7
mA
Reference voltage
V
REF
5
1.207
V
ADP detection voltage L
V
ADPL
V
CC
: H L
19
2.70
2.80
2.90
V
ADP detection voltage L
Hysteresis voltage width
V
ADPLW
19
50
100
150
mV
ADP detection voltage H
V
ADPH
V
CC
: L H
20
5.8
6.0
6.2
V
ADP detection voltage H
Hysteresis voltage width
V
ADPHW
20
50
100
150
mV
BAT pin leak current
I
BAT
13
1
A
BAT pin output voltage
V
BAT
Ta=0~+50C
13
4.090 4.120 4.150
V
CNT pin output voltage
V
CNT
I
CNT
=20mA
17
0.5
V
SW1 pin input current
I
SW1
1
40
60
80
A
SW1 pin input voltage H
V
SW1H
1
0.6
1.20
V
SW1 pin input voltage L
V
SW1L
1
0.25
V
SW2 pin input current
I
SW2
2
40
60
80
A
SW2 pin input voltage H
V
SW2H
2
0.6
1.20
V
SW2 pin input voltage L
V
SW2L
2
0.25
V
Current limit 1
V
L1
Rapid Charging
14, 15
0.35
0.45
0.55
V
Current limit 2
V
L2
Preliminary Charging
14, 15
20
25
30
mV
Current detection amp gain
G
I
10
17.5
18.0
18.5
dB
Current detection amp input
offset voltage
V
OFF
10
-4.5
0
4.5
mV
Current detection amp output current
I
CDO
10
0.5
1.0
mA
V
OUT1
pin output voltage
V
OUT1
I
OUT1
=0.12mA
20
0.2
0.4
V
V
OUT2
pin output voltage
V
OUT2
I
OUT2
=0.12mA
19
0.2
0.4
V
Battery temperature
detection voltage
V
TDET
V
TDET
: H L
11
0.390 0.413 0.435
V
Battery temperature
detection voltage
V
TDETW
11
30
60
90
mV
hysteresis voltage width
T
OUT
pin output voltage
V
TOUT
I
TOUT
=0.12mA
11
0.2
0.4
V
TDET input bias current
I
T
12
30
150
nA
Timer error time
T
Excluding Dispersion
17
-10
10
%
*
Current limit 1 and 2 are prescribed by the current detection resistor voltage drop range.
*
If the control on this IC fails to work, its safety can not be guaranteed. Please protect with something other
than this IC.
*
Please use a capacitor with good temperature characteristics in the OSC section. Capacitor deviation
causes timer error.
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
(2) Timer Times
R
75k
100k
120k
130k
150k
200k
C
0.0047
0.47ms
0.63ms
0.75ms
0.82ms
0.94ms
1.26ms
0.0082
0.83ms
1.10ms
1.32ms
1.43ms
1.65ms
2.20ms
0.01
1.03ms
1.37ms
1.63ms
1.77ms
2.04ms
2.73ms
0.015
1.48ms
1.98ms
2.38ms
2.58ms
2.97ms
3.95ms
0.022
2.16ms
2.87ms
3.44ms
3.73ms
4.30ms
5.76ms
Item
Formula
Example (for C = 0.01, R = 130k)
Pre-charge timer
T 2
19
15M28s
T: OSC oscillation cycle
Measuring Circuit
MITSUMI
Lithium Ion Battery Charging Control (microcomputer-controlled type) (one cell) MM1475
Item
Measurement method
Consumption current 1
Measure A18 current value I
CC1
when V1 = V2 = 1.2V.
Consumption current 2
Measure A18 current value I
CC2
.
Reference voltage
Measure T5 potential V
REF
.
ADP detection voltage L
Gradually lower V
CC
from 5V. V
CC
potential when T19 potential goes over V
CC
-
0.5V is V
ADPL
.
Gradually lower V
CC
from 2V. V
CC
potential when T19 potential drops below
0.5V is V
ADPL2
. V
ADPLW
=V
ADPL2
-V
ADPL
ADP detection voltage H
Gradually raise V
CC
from 5V. V
CC
potential when T20 potential goes over V
CC
-
0.5V is V
ADPH
.
Gradually lower V
CC
from 7V. V
CC
potential when T20 potential drops below
0.5V is V
ADPH2
. V
ADPHW
=V
ADPH
-V
ADPH2
BAT pin leak current
Measure A13 current value I
BAT
when V
CC
= 0V, S17: B, V17 = 0V.
BAT pin output voltage
Gradually raise V13 from 3.5V. T13 potential when T15-T14 potential
difference is 20mV or less is V
BAT
.
CNT pin output voltage
Gradually raise V17 from 0V when V13 = 3.5V and S17: B. T17 potential when
A17 current value reaches 20mA is V
CNT
.
SW1 pin input current
Measure A1 current value I
SW1
.
Change V1 from 0V to 1.2V when V13 = 3.5V and V2 = 1.2V. To identify V
SW1
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.
SW2 pin input current
Measure A2 current value I
SW2
.
Change V2 from 0V to 1.2V when V13 = 3.5V. To identify V
SW2
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.
Current limit 1
Gradually raise V
CC
current limit value when V13 = 3.5V, and measure T15 -T14
potential difference VL1.
Current limit 2
V13 = 2.5V, V1 = V2 = 1.2V, and T15-T14 potential difference is V
L2
.
Current detection amp gain
T15-T14 potential difference fluctuation is Va and T10 potential fluctuation is
Vb when V13 = 3.5V and V
CC
current limit value is changed from 100mA to
200mA.
G
I
=20log Vb/ Va
T10 potential is Vb2 when V13 = 4.0V and V
CC
current limit value is 100mA.
V
OFF
=Vb2/8-30mV
Measure A10 current value when V13 = 3.5V, V
CC
current limit value is 300mA,
S10: B and V10 = 0V.
V
OUT
1 pin output voltage
Gradually raise V20 from 0V when S20: B. T20 potential when A20 current
value is 0.12mA is V
OUT1
.
V
OUT
2 pin output voltage
Gradually raise V19 from 0V when S19: B. V19 potential when A19 current
value is 0.12mA is V
OUT2
.
At S12:B, lower gradually from V12 = 0V. T12 potential is V
TDET
when T11
potential falls below 0.3V.
At S12:B, lower gradually fromV12 = 0V. T12 potential is V
TDET2
when T11
potential goes above 0.8V. V
TDETW
= V
TDET2
- V
TDET
T
OUT
pin output voltage
Raise V11 gradually from 0V when S12:B, V12 = 0V, S11:B. T11 potential is
V
TOUT
when A11 current value is 0.12mA.
TDET input bias current
Measure A12 current value I
T
for S12:B, V12 = 0V.
ADP detection voltage L
Hysteresis voltage width
ADP detection voltage H
Hysteresis voltage width
SW1 pin input voltage H
SW1 pin input voltage L
Current detection amp
output current
Battery temperature
detection voltage
Battery temperature
detection voltage
hysteresis voltage width
Current detection amp
input offset voltage
SW2 pin input voltage H
SW2 pin input voltage L
Measurement method
(Except where otherwise indicated, Ta = 25C, Vcc = 5V, V
CC
: current limit 0.5A,
V1 = V2 = 0V, V13 = 4.2V, S10, 11, 12, 17, 19, 20, 24:A, timer time is not up)
MITSUMI
Lithium Ion Battery Charging Control (microcomputer-controlled type) (one cell) MM1475
V
CC
: ON
Start
V
CC
BAT pin
voltage
Charging current
SW1
SW2
0V
0A
H
H
L
L
Full charge
2V
4.1V
3V
5V
Pre-charging
V
CC
: ON
Start
V
CC
BAT pin
voltage
Charging current
SW1
SW2
5V
0V
0V
0A
L
H
H
Time up
Pre-charging
When charging is performed normally
Pre-Charging Time Up
Timing Chart
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
-25
0
25
50
75
0.3
0.35
0.4
0.45
0.5
0.55
0.6
Ambient temperature (
C)
Current Limit 1 (V)
-25
0
25
50
75
0
10
20
30
40
50
Ambient temperature (
C)
Current Limit 2 (mV)
-25
0
25
50
75
4.15
4.14
4.13
4.12
4.11
4.10
4.09
4.08
4.07
4.06
4.05
Ambient temperature (
C)
BAT Pin Output Voltage (V)
When VBAT=4.12V
Current Limit 1 vs Ambient temperature
Current Limit 2 vs Ambient temperature
BAT Pin Output Voltage vs Ambient temperature
0
50
100
150
200
250
300
0
0.5
1
1.5
2
2.5
Potential Difference between (CS+) and (CS-) (mV)
CDO Output Voltage (V)
Ta=25
C
Current Detection Input/Output
1
10
100
0.5
0.4
0.3
0.2
0.1
0
ICNT Current (mA)
VCNT Voltage (V)
Ta=25
C
VCNT Voltage vs ICNT Current
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
0
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
0.1
BAT Pin Voltage (V)
BAT Reverse Current (
A)
BAT Pin Reverse Current vs BAT Pin Voltage
100
120
140
160
180
200
0
1
2
3
4
5
6
OSC Resistance R (k
)
Oscillation cycle (ms)
Ta=25
C
C=0.022
F
C=0.0047
F
C=0.01
F
OSC Oscillation Cycle vs CR
0
0.02
0.04
0.06
0.08
0.1
0
5
10
15
20
when Ta = 25
C, Vcc = 0 6.5V
Capacitance between (VDET-TD) and GND (
F)
ADP Detection H Delay Time (ms)
ADP Detection H Delay Time
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