LTC3553

RECOMMENDED FOR NEW DESIGNS

Micropower USB Power Manager With Li-Ion Charger, LDO and Buck Regulator

Part Models: 2
1ku List Price: Starting From $2.72

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Overview

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
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

The LTC3553 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 12μA. The LTC3553 is available in a 3mm × 3mm × 0.75mm 20-pin QFN package.


Option	LDO	PGOOD	Hard Reset Time
LTC3553	ON/OFF Control	No	5 Seconds
LTC3553-2	Always On	Yes	14 Seconds

Applications

USB-Based Handheld Products
Portable Li-Ion/Polymer Based Electronic Devices
Wearable Electronics
Low Power Medical Devices

Part Models: 2
1ku List Price: Starting From $2.72

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC3553EUD#PBF	20-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3553EUD#TRPBF	20-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Battery Monitors & Fuel Gauges 1
LTC2942	NOT RECOMMENDED FOR NEW DESIGNS	Battery Gas Gauge with Temperature, Voltage Measurement
Circuit Monitors 1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Protection Switches & Controllers 2
LTC4362-1 LTC4362-2		1.2A Overvoltage/Overcurrent Protector
LTC2955	RECOMMENDED FOR NEW DESIGNS	Pushbutton On/Off Controller with Automatic Turn-On

Evaluation Kits

LTC3553EPD Demo Board | Micropower USB Power Manager with Li-Ion Charger, LDO, and Buck Regulator

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Product Details

Demonstration Circuit DC1550A is a Micropower USB Power Manager with Li-Ion Charger, Buck DC/DC, and LDO Regulator featuring the LTC3553. It features a USB input, a 500mA CC/CV Li-Ion linear charger, a 3.3V/200mA synchronous buck and a 1.2V/150mA low dropout linear regulator. 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.