LTC4156IUFD View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LTC4156IUFD

Dual-Input Power Manager/3.5A LiFePO4 Battery Charger with I2C Control and USB OTG

Linear Technology 

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LTC4156

OPERATION

POWER AVAILABLE

CLEAR LOW BATTERY

AND SAFETY TIMERS

YES

NTC OUT-OF-RANGE

NO

VBAT < 2.7V

VBAT

VBAT > VFLOAT – ε

TRICKLE CHARGE (8%)

INDICATE LOW CELL VOLTAGE

2.8V < VBAT < VFLOAT – ε

CHARGE AT

CONSTANT CURRENT

CHARGE AT

FIXED VOLTAGE

RUN LOW BATTERY TIMER

PAUSE SAFETY TIMER

RUN SAFETY TIMER

PAUSE SAFETY TIMER

INDICATE NTC WARNING

NO

TIMER > 30 MINUTES

YES

STOP CHARGING

INDICATE BATTERY FAULT

NO

VBAT > 2.8V

YES

INDICATE

CONSTANT CURRENT

VBAT RISING

YES

THROUGH VRECHRG

NO

BAT FALLING

YES

THROUGH VRECHRG

NO

SAFETY TIMER

NO

EXPIRED

YES

STOP CHARGING

INDICATE CHARGING

STOPPED

NO

VBAT < VRECHRG

YES

Figure 7. Battery Charger Flow Chart

IBAT < C/x

NO

INDICATE CONSTANT

VOLTAGE, I > C/x

YES

INDICATE CONSTANT

VOLTAGE, I < C/x

TIMER IN 4 HOUR - NO

C/x MODE

YES

4156 F07

LTC4156

RBIAS

NTCBIAS

NTC

T RNTC

4156 F08

Figure 8. Standard Thermistor Network

4156f

32

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