LTC3557/LTC3557-1
USB Power Manager with Li-Ion Charger and Three
Step-Down
Regulators
FEATURES
■ Seamless Transition Between Input Power Sources: Li-Ion Battery, USB, 5V Wall Adapter or High Voltage Buck
Regulator with Bat-TrackTM
■ 200mΩ Internal Ideal Diode Plus Optional External Ideal Diode Controller Provides Low Loss Power Path When Input Current is Limited or Unavailable
■ Triple Adjustable High Efficiency Step-Down Switching
Regulators (600mA, 400mA, 400mA IOUT)
■ Pin Selectable Burst Mode® Operation ■ Full Featured Li-Ion/Polymer Battery Charger ■ 1.
5A Maximum Charge Current with Thermal Limiting ■ Battery Float Voltage:
4.
2V (LTC3557) 4.
1V (LTC3557-1) ■ Low Profile 4mm × 4mm 28-Pin ...