LTC3553-2 Series

Micropower USB Power Manager with Li-Ion Charger, Always-On LDO and Buck Regulator

Catalog

Micropower USB Power Manager with Li-Ion Charger, Always-On LDO and Buck Regulator

Part	Package / Case	Applications	Supplier Device Package	Operating Temperature [Max]	Operating Temperature [Min]	Mounting Type	Current - Supply	Voltage - Supply [Max]	Voltage - Supply [Min]
Analog Devices LTC3553EUD	20-WFQFN Exposed Pad	Handheld/Mobile Devices	20-QFN (3x3)	85 °C	-40 °C	Surface Mount	12 µA	5.5 V	4.3 V
Analog Devices LTC3553EPD#PBF	20-UFQFN Exposed Pad	Handheld/Mobile Devices	20-UTQFN (3x3)	85 °C	-40 °C	Surface Mount	12 µA	5.5 V	4.35 V
Analog Devices LTC3553EPD	20-UFQFN Exposed Pad	Handheld/Mobile Devices	20-UTQFN (3x3)	85 °C	-40 °C	Surface Mount	12 µA	5.5 V	4.35 V
Analog Devices LTC3553EUD-2#PBF	20-WFQFN Exposed Pad	Handheld/Mobile Devices	20-QFN (3x3)	85 °C	-40 °C	Surface Mount	12 µA	5.5 V	4.35 V

Catalog

Micropower USB Power Manager with Li-Ion Charger, Always-On LDO and Buck Regulator

Key Features

• 12μA Standby Mode Quiescent Current (All Outputs On)

• Seamless Transition Between Input Power Sources: Li-Ion/Polymer Battery and USB

• 240mΩ Internal Ideal Diode Provides Low Loss PowerPath™

• High Efficiency 200mA Buck Regulator

• Always-On 150mA Low Dropout (LDO) Linear Regulator

• Pushbutton On/Off Control With System Reset

• Full Featured Li-Ion/Polymer Battery Charger

• Programmable Charge Current With Thermal Limiting

• Instant-On Operation With Discharged Battery

• 3mm × 3mm × 0.75mm 20-Pin QFN Package

Description

The LTC3553-2 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 LTC3553-2 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 LTC3553-2 also includes a synchronous buck regulator, an always-on 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 12μA. The LTC3553-2 is available in a 3mm × 3mm × 0.75mm 20-pin QFN package.OptionsLDOPGOODHard Reset TimeLTC3553ON/OFF ControlNo5 secondsLTC3553-2Always OnYes14 secondsApplicationsUSB-Based Handheld ProductsPortable Li-Ion/Polymer Based Electronic DevicesWearable ElectronicsLow Power Medical Devices