LTC3553-2 - Micropower USB Power Manager with Li-Ion Charger, Always-On LDO and Buck Regulator
Datasheet Documentation
Datasheet
Reliability Data
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Overview

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

Typical Application

LTC3553-2 Typical Application
LTC3553-2 Typical Application

Description

The LTC®3553-2 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 specifi cally 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 Time
LTC3553 ON/OFF Control No 5 seconds
LTC3553-2 Always On Yes 14 seconds
Packaging

3x3 QFN-20

LTC3553-2 Package Drawing
Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price
(1-99)		 Price
(1k)*
LTC3553EUD#PBF QFN 20 E $3.22 $2.25
LTC3553EUD#TRPBF QFN 20 E $2.31
LTC3553EUD-2#PBF QFN 20 E $3.22 $2.25
LTC3553EUD-2#TRPBF QFN 20 E $2.31
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.


Part Number Description Price Documentation
DC1920A LTC3553EUD-2 Demo Board I Micropower USB Power Manager with Li-Ion Charger, Always-On LDO and Buck Regulator $150.00