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Circuit Description
2-4 POWER MANAGEMENT
2-4-1 DC/DC Converter
Our 1 cell Li-ion battery solution requires a up-converting DC/DC conversion circuit for efficiency
improvement. The device is a PWM Step-up DC/DC converter IC. Specification is as below;
¥ Vin: 2.75 V ~ 4.2 V
¥ Vout: 3.3 V ~ 4.1 V
¥ Ripple: less than 50 mVpp
¥ Efficiency: typ. 85 % (up to 96%)
2-4-2 Charger Circuitry
The simplified built-in charger circuit diagram is as below ;
3.6V
BATT
DC
2-4
Buzzer
Backlight LED
Vibrator
CHARGER
< Fig. 4 Built-in Charger Circuitry >
3.3V
LDO
3.6V
PAM
3.3V
DC/DC
LDO
LDO
V DECTECTOR
T DECTECTOR
DC IN DECTECTOR
RTC
3.0V
B.B
3.0V
R.F
BAT_VOLT
Temperature
DC In
Charger On
SCL
SDA
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