Power Management PMIC & Multifunction PMIC (DC/DC, PowerPath and Battery Charger)

LTC2942 - Battery Gas Gauge with Temperature, Voltage Measurement

LTC2955 - Pushbutton On/Off Controller with Automatic Turn-On

LTC3556 - High Efficiency USB Power Manager with Dual Buck and Buck-Boost DC/DCs

Features

    POWER MANAGER
  • High Efficiency Switching PowerPath Controller with Bat-Track Adaptive Output Control
  • Programmable USB or Wall Current Limit (100mA/500mA/1A)
  • Full Featured Li-Ion/Polymer Battery Charger
  • Instant-On Operation with a Discharged Battery
  • 1.5A Maximum Charge Current
  • Internal 180mΩ Ideal Diode Plus External Ideal Diode Controller Powers Load in Battery Mode
  • Low No-Load IQ when Powered from BAT (<30μA)
    DC/DCs
  • Dual High Efficiency Buck DC/DCs (400mA/400mA IOUT)
  • High Efficiency Buck-Boost DC/DC (1A IOUT)
  • All Regulators Operate at 2.25MHz
  • Dynamic Voltage Scaling on Two Buck Outputs
  • I2C Control of Enables, Mode, Two VOUT Settings
  • ENALL Pin with Power-Up Sequence Control
  • Low No-Load Quiescent Current: 20μA Each

Typical Application

LTC3556 Typical Application
LTC3556 Typical Application

Description

The LTC3556 is a highly integrated power management and battery charger IC for Li-Ion/Polymer battery applications. It includes a high efficiency current limited switching PowerPath manager with automatic load prioritization, a battery charger, an ideal diode, and three synchronous switching regulators (two bucks and one buck-boost). Designed specifically for USB applications, the LTC3556’s switching power manager automatically limits input cur- rent to a maximum of either 100mA or 500mA for USB applications or 1A for adapter-powered applications.

The LTC3556’s switching input stage transmits nearly all of the 2.5W available from the USB port to the system load with minimal power wasted as heat. This feature allows the LTC3556 to provide more power to the application and eases the constraint of thermal budgeting in small spaces. The two buck regulators can provide up to 400mA each and the buck-boost can deliver 1A.

The LTC3556 is available in the low profile 28-pin (4mm × 5mm × 0.75mm) QFN surface mount package.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing		 RoHS
LTC3556EUFD#PBF 4x5 QFN-28 UFD E 05-08-1712 Yes
LTC3556EUFD#TRPBF 4x5 QFN-28 UFD E 05-08-1712 Yes


LTC3556 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)		 Price
(1k)*		 RoHS
LTC3556EUFD#PBF 4x5 QFN-28 E $6.86 $4.80 Yes
LTC3556EUFD#TRPBF 4x5 QFN-28 E $4.86 Yes
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* 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
DC1296A LTC3556EUFD Demoboard | High Efficiency USB Power Manager+ Dual Buck+Buck Boost DC/DC $150.00
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Companion Boards

Part Number Description Price Documentation
DC590B Isolated USB Serial Controller for Linear Technology QuikEval-Compatible Demo Boards $50.00
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Click here to view our complete list of demo boards

Applications

  • HDD-Based MP3 Players, PDAs, GPS, PMPs
  • Other USB-Based Handheld Products

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Design Tools

Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:

  • LTspice - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
  • LTpowerCAD - A complete power supply selection, synthesis and design tool
  • LTpowerPlay - A development environment supporting Linear Technology's Digital Power System Management (PSM) products
  • PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
  • Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
  • LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
  • And More!

Technical Support