ltc4097 Linear Technology Corporation, ltc4097 Datasheet - Page 14

• Manufacturer Part Number: ltc4097
• Description: Usb/wall Adapter Standalone Li-ion/polymer Battery Charger
• Manufacturer: Linear Technology Corporation

LTC4097
OPERATION
14
SUSP
DRIVEN LOW
BAT < 2.9V
2.9V < BAT
BAT < 4.1V
IN VOLTAGE MODE
I
BAT
< I
CHRG STATE: PULLDOWN
CHRG STATE: PULLDOWN
BAT > 2.9V
TERMINATE
NO CHARGE CURRENT
1/10th FULL CURRENT
I
DCIN
CHRG STATE: Hi-Z
CHRG STATE: Hi-Z
TRICKLE CHARGE
FULL CURRENT
SHUTDOWN
DROPS TO 20µA
STANDBY
CHARGE
MODE
MODE
MODE
MODE
Figure 1. LTC4097 State Diagram of a Charge Cycle
DCIN POWER APPLIED
DCIN POWER
REMOVED
SUSP
DRIVEN HIGH
DCIN POWER
REMOVED
POWER SELECTION
STARTUP
SUSP
DRIVEN HIGH
USBIN POWER
REMOVED OR
DCIN POWER
APPLIED
USBIN POWER
REMOVED OR
DCIN POWER
ONLY USB POWER APPLIED
APPLIED
1/5 FULL CURRENT⇒HPWR = LOW
FULL CURRENT⇒HPWR = HIGH
CHRG STATE: PULLDOWN
CHRG STATE: PULLDOWN
I
1/10th FULL CURRENT
NO CHARGE CURRENT
USBIN
CHRG STATE: Hi-Z
TRICKLE CHARGE
CHRG STATE: Hi-Z
SHUTDOWN
DROPS TO 20µA
STANDBY
CHARGE
MODE
MODE
MODE
MODE
BAT > 2.9V
I
IN VOLTAGE MODE
BAT
< I
TERMINATE
4097 F01
SUSP
DRIVEN LOW
BAT < 4.1V
BAT < 2.9V
2.9V < BAT
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