SC802 SEMTECH [Semtech Corporation], SC802 Datasheet - Page 11

• Manufacturer Part Number: SC802
• Description: Fully Integrated Lithium-Ion Battery Charger System with Timer
• Manufacturer: SEMTECH [Semtech Corporation]

© 2005 Semtech Corp.
POWER MANAGEMENT
PRELIMINARY
State Diagram
Yes
Yes
Yes
Yes
Over Voltage, Under
Over Voltage, Under
Voltage, or Over
Voltage, or Over
Temperature will force
Temperature will force
the SC802 into
the SC802 into
Shutdown Mode from
Shutdown Mode from
any state.
any state.
Float Charge Mode
Float Charge Mode
Vout< CV-100mV
Vout< CV-100mV
Vout< CV-100mV
Vout< CV-100mV
Start LDO Mode
Start LDO Mode
CHRGB High Z
CHRGB High Z
Monitor Mode
Monitor Mode
Iout<Iterm
Iout<Iterm
Yes
Yes
Vout = CV
Vout = CV
Vout=off
Vout=off
Yes
Yes
Yes
Yes
Soft Start CC Mode
Soft Start CC Mode
Float Charge Mode
Float Charge Mode
OVP> Vin > UVLO
OVP> Vin > UVLO
Iout=1500/Rprog
Iout=1500/Rprog
CHRGB High Z
CHRGB High Z
Yes
Yes
Start CV Mode
Start CV Mode
Soft Start Vout
Soft Start Vout
Yes
Yes
Time>Tmax
Time>Tmax
Time>Tmax
Time>Tmax
CHRGB Low
CHRGB Low
BIPB=Low
BIPB=Low
Iout<Iterm
Iout<Iterm
Vout = CV
Vout = CV
Enabled?
Enabled?
Vout=CV
Vout=CV
Timer
Timer
En=Hi
En=Hi
Yes
Yes
11
Yes
Yes
Yes
Yes
SC802A:Iout=145/Rterm
SC802A:Iout=145/Rterm
CHRGB blinks at 0.5Hz
CHRGB blinks at 0.5Hz
Yes
Yes
SC802:Iout=246/Rterm
SC802:Iout=246/Rterm
Re-cycle EN or VCC
Re-cycle EN or VCC
Charge resumes when NTC
Charge resumes when NTC
Start Pre-Charge
Start Pre-Charge
Shutdown Mode
Shutdown Mode
Yes
Yes
CHRGB High Z
CHRGB High Z
NTC out of Range Fault
NTC out of Range Fault
CHRGB blinks at 0.5Hz
CHRGB blinks at 0.5Hz
0C > NTC Temp >50C
0C > NTC Temp >50C
Time>Tmax/4
Time>Tmax/4
Timeout Fault
Timeout Fault
Vbat>2.8V or
Vbat>2.8V or
Vout/Iout off
Vout/Iout off
Temperature is valid
Temperature is valid
Pre-Charge
Pre-Charge
Start Timer
Start Timer
Yes
Yes
Cleared by
Cleared by
Vout>2.8V
Vout>2.8V
CPB Low
CPB Low
Enabled?
Enabled?
Timer is frozen
Timer is frozen
Timer
Timer
SC802/SC802A
CC=Constant Current
CC=Constant Current
CV=Constant Voltage
CV=Constant Voltage
www.semtech.com