LT3653 - 1.2A, HV Input Regulator with Output Current Limit for Battery Charger Applications
Features
- Wide Input Range:
– Operation from 7.5V to 30V
– Overvoltage Lockout Protects Circuit Through 60V Transients - Operates with LTC Bat-Track Li-Ion Battery Chargers to Maximize Efficiency
- No Reverse Discharge Path from VOUT to VIN
- Programmable Output Current Limit
- Integrated BOOST Diode
- Thermal Protection
- Small Application Size
- Thermally Enhanced 2mm × 3mm DFN Package
AEC-Q100 data available for specific packages
Typical Application
Description
The LT3653 is a monolithic current mode PWM step-down regulator with programmable output current limit. Typically, it is used with battery charger power path controllers to pre-regulate the output and optimize the battery charger efficiency. Output current limit provides accurate control over system power dissipation.The wide operating input voltage range of 7.5V to 30V suits the LT3653 to a variety of input sources, including unregulated 12V wall adapters, 24V industrial supplies, Firewire and automotive power. Input overvoltage protection allows the LT3653 to handle 60V input transients.
The LT3653 control pin, VC , is available for external battery tracking control, Bat-Track. The LT3653 will block output discharge during an open or shorted input.
The HVOK pin indicates that the internal bias supplies are present and no faults have occurred (i.e., overtemperature and input overvoltage and undervoltage). The LT3653 includes a 1.5MHz frequency oscillator, internal compensation, and an internal boost diode to minimize the number of external components. The LT3653 is available in an 8-lead (2mm × 3mm) package with exposed pads for low thermal resistance.
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 |
|---|---|---|---|---|---|
| LT3653EDCB#PBF | 2x3 DFN-8 | DCB | E | 05-08-1718 | Yes |
| LT3653EDCB#TRMPBF | 2x3 DFN-8 | DCB | E | 05-08-1718 | Yes |
| LT3653EDCB#TRPBF | 2x3 DFN-8 | DCB | E | 05-08-1718 | Yes |
| LT3653IDCB#PBF | 2x3 DFN-8 | DCB | I | 05-08-1718 | Yes |
| LT3653IDCB#TRMPBF | 2x3 DFN-8 | DCB | I | 05-08-1718 | Yes |
| LT3653IDCB#TRPBF | 2x3 DFN-8 | DCB | I | 05-08-1718 | 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 | |
|---|---|---|---|---|---|---|
| LT3653EDCB#PBF | 2x3 DFN-8 | E | $3.57 | Yes | ||
| LT3653EDCB#TRMPBF | 2x3 DFN-8 | E | $3.57 | $2.55 | Yes | |
| LT3653EDCB#TRPBF | 2x3 DFN-8 | E | $3.57 | $2.50 | Yes | |
| LT3653IDCB#PBF | 2x3 DFN-8 | I | $4.11 | Yes | ||
| LT3653IDCB#TRMPBF | 2x3 DFN-8 | I | $4.11 | $2.93 | Yes | |
| LT3653IDCB#TRPBF | 2x3 DFN-8 | I | $4.11 | $2.88 | 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 |
|---|---|---|---|
| DC1325A | LT3653EDCB Demo Board | 1.2A, HV Input Preregulator with Output Current Limit for Battery Charger Application | Contact Factory | |
| Buy Now | |||
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LT3653IDCB#PBF | 2x3 DFN-8 | I | $4.11 | Yes | ||
| LT3653IDCB#TRMPBF | 2x3 DFN-8 | I | $4.11 | $2.93 | Yes | |
| LT3653IDCB#TRPBF | 2x3 DFN-8 | I | $4.11 | $2.88 | Yes | |
| Buy Now • Request Samples | ||||||
Applications
- Battery Powered Equipment
- Portable USB Devices – Cameras, MP3 Players, PDAs
- Automotive Battery Regulation
- Multiple-Source Battery Chargers
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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.
