LTC3456 - 2-Cell, Multi-Output DC/DC Converter with USB Power Manager
Features
- Seamless Transition Between 2-Cell Battery, USB and AC Wall Adapter Input Power Sources
- Main Output: Fixed 3.3V Output
- Core Output: Adjustable from 0.8V to VBATT(MIN)
- Hot Swap Output for Memory Cards
- All Outputs Discharged to Ground During Shutdown
- Power Supply Sequencing: Main and Hot Swap Outputs Come Up After Core Output
- Accurate USB Current Limiting
- High Frequency Operation: 1MHz
- High Efficiency: Up to 92%
- Small (4mm × 4mm × 0.75mm) 24-Pin QFN Package
Typical Application
Description
The LTC3456 is a complete power management system IC optimized for a variety of portable applications. The device generates two separate power rails: a 3.3V (fixed) Main supply and a 1.8V (adjustable) Core supply. In addition, the LTC3456 contains a USB power manager, a Hot Swap output, a low-battery indicator and an alwaysalive VMAX output. The LTC3456 takes power from one of three sources: a Wall adapter, a USB port or a 2-cell Alkaline/NiCd/NiMH battery, in that order of priority. Current drawn from the USB port is accurately limited to 100mA or 500mA based on the state of the USBHP pin.The Main and Core switchers are all high efficiency, 1MHz fixed frequency PWM converters. Availability in a small (4mm × 4mm × 0.75mm) 24-pin QFN package makes the LTC3456 ideal for space-sensitive portable devices.
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 |
|---|---|---|---|---|---|
| LTC3456EUF#PBF | 4x4 QFN-24 | UF | E | 05-08-1697 | Yes |
| LTC3456EUF#TRPBF | 4x4 QFN-24 | UF | E | 05-08-1697 | Yes |
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 | |
|---|---|---|---|---|---|---|
| LTC3456EUF#PBF | 4x4 QFN-24 | E | $4.70 | $3.95 | Yes | |
| LTC3456EUF#TRPBF | 4x4 QFN-24 | E | $4.05 | Yes | ||
| Buy Now • Request Samples | ||||||
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 |
|---|---|---|---|
| DC658A | LTC3456EUF | PMIC without Battery Charger, 2V ≤ VIN ≤ 5.5V, 1.8Vout1@200mA, 3.3Vout2@150mA, 3.3Vout3@50mA | Contact Factory | |
| Buy Now | |||
Applications
- GPS Portable Navigators
- MP3 Players
- Digital Cameras
- Handheld Computers
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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
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
