LTC3455/LTC3455-1 - Dual DC/DC Converter with USB Power Manager and Li-Ion Battery Charger

Features

  • Click Here For LTC3455 Evaluation Kits
  • Seamless Transition between Input Power Sources: Li-Ion Battery, USB, and 5V Wall Adapter
  • Accurate USB Current Limiting (500mA/100mA)
  • Two High Efficiency DC/DC Converters: Up to 96%
  • Thermal Regulation Maximizes Battery Charge Rate without Risk of Overheating
  • Full-Featured Li-Ion Battery Charger with 4.2V Float Voltage for LTC3455 and 4.1V for LTC3455-1
  • 4.1V Float Voltage (LTC3455-1) Improves Battery Life and High Temperature Safety Margin
  • Hot Swap Output for SDIO and Memory Cards
  • Pin-Selectable Burst Mode Operation
  • Output Disconnect: All Outputs Discharged to Ground During Shutdown
  • Available in a 4mm × 4mm × 0.75mm 24-Pin QFN Package

Typical Application

LTC3455
LTC3455
Back to Top

Description

The LTC3455/LTC3455-1 are complete power management solutions for a variety of portable applications. These devices contain two synchronous step-down DC/DC converters, a USB power controller, a full-featured Li-Ion battery charger, a Hot Swap output, a low-battery indicator, and numerous internal protection features. The LTC3455/LTC3455-1 provide a small, simple solution for obtaining power from three different power sources: a single-cell Li-Ion battery, a USB port, and a wall adapter. Current drawn from the USB bus is accurately limited under all conditions. Whenever a USB or a wall adapter is present, the battery charger is enabled and all internal power for the device is drawn from the appropriate external power source. All outputs are discharged to ground during shutdown to provide complete output disconnect. These devices are available in a 4mm × 4mm 24-pin exposed-pad QFN package.
Back to Top

Packaging

QFN-24

LTC3455
Back to Top

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3455EUF QFN 24 E $5.64 $3.95 View
LTC3455EUF#PBF QFN 24 E $5.64 $3.95 View
LTC3455EUF#TR QFN 24 E   $4.05 View
LTC3455EUF#TRPBF QFN 24 E   $4.05 View
LTC3455EUF-1#PBF QFN 24 E $5.64 $3.95 View
LTC3455EUF-1#TRPBF QFN 24 E   $4.01 View
Buy Now
Request Samples
* 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.

Evaluation Kits

Part Number Description Price
DC631B LTC3455EUF | USB Power Solution, USB / Adapter to Li-Ion, 3.15V @ 500mA, 1.8V @ 400mA, Vin = 5V +/ - 5% $150.00
Buy Now


Back to Top

Applications

  • Handheld Computers
  • Digital Cameras
  • MP3 Players
Back to Top

Simulate

To simulate selected Linear Technology products, please download LTSpice / SwitcherCAD III. This powerful schematic capture and simulation tool includes macro models for 80% of Linear Technology's switching regulators, over 200 op amp models, as well as resistors, transistors and MOSFET models.

For other simulation tools, visit our Design Simulation and Device Models page.

Back to Top