LTC3553
Micropower USB Power
Manager With Li-Ion Charger,
LDO and Buck Regulator
Description Features The LTCВ®3553 is a micropower, highly integrated power
management and battery charger IC for single-cell
Li-Ion/Polymer battery applications. It includes a
PowerPath manager with automatic load prioritization,
a battery charger, an ideal diode and numerous internal
protection features. Designed specifically for USB applications, the LTC3553 power manager automatically limits
input current to a maximum of either 100mA or 500mA.
Battery charge current is automatically reduced such that
the sum of the load current and the charge current does
not exceed the selected input current limit. The LTC3553
also includes a synchronous buck regulator, a low dropout
linear regulator (LDO), and a pushbutton controller. With
all supplies enabled in standby mode, the quiescent current drawn from the battery is only 12ОјA. The LTC3553 is
available in a 3mm Г— 3mm Г— 0.75mm 20-pin QFN package. 12ОјA Standby Mode Quiescent Current (All Outputs On)
n Seamless Transition Between Input Power Sources:
Li-Ion/Polymer Battery and USB
n 240mО© Internal Ideal Diode Provides Low Loss
PowerPathв„ў
n High Efficiency 200mA Buck Regulator …