LTC3202 - Low Noise, High Efficiency Charge Pump for White LEDs
Features
- Low Noise Constant Frequency Operation
- 25% Less Input Current Than Doubler Charge Pump
- High Output Current: Up To 125mA
- Small Application Circuit
- Regulated Output Voltage or Current
- Automatic Soft-Start
- VIN Range: 2.7V to 4.5V
- No Inductors
- 1.5MHz Switching Frequency
- ICC < 1µA in Shutdown
- Available in 10-Pin MSOP and 3mm x 3mm DFN Packages
Typical Application
Description
The LTC3202 is a low noise, constant frequency charge pump DC/DC converter that uses fractional conversion to increase efficiency in white LED applications. The part can be used to produce a regulated voltage or current of up to 125mA from a 2.7V to 4.5V input. Low external parts count (two flying capacitors and two small bypass capacitors at VIN and VOUT) make the LTC3202 ideally suited for small, battery-powered applications.
An internal 2-bit DAC allows LED current to be adjusted for LED brightness control. The LTC3202 also has thermal shutdown protection and can survive a continuous shortcircuit from VOUT to GND. Built-in soft-start circuitry prevents excessive inrush current during start-up. High switching frequency enables the use of small external capacitors. A low current shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1µA.
The LTC3202 is available in the 10-pin MSOP and 3mm x 3mm DFN packages.
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 |
|---|---|---|---|---|---|
| LTC3202EDD#PBF | 3x3 DFN-10 | DD | E | 05-08-1699 | Yes |
| LTC3202EDD#TRPBF | 3x3 DFN-10 | DD | E | 05-08-1699 | Yes |
| LTC3202EMS#PBF | MS-10 | MS | E | 05-08-1661 | Yes |
| LTC3202EMS#TRPBF | MS-10 | MS | E | 05-08-1661 | 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 | |
|---|---|---|---|---|---|---|
| LTC3202EDD#PBF | 3x3 DFN-10 | E | $2.93 | $2.00 | Yes | |
| LTC3202EDD#TRPBF | 3x3 DFN-10 | E | $2.10 | Yes | ||
| LTC3202EMS#PBF | MS-10 | E | $2.25 | $1.90 | Yes | |
| LTC3202EMS#TRPBF | MS-10 | E | $1.96 | 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 |
|---|---|---|---|
| DC395A | LTC3202EMS Demo Board | Fractional Charge Pump LED Driver, 6 Paralleled LEDs, 2.7V ≤ VIN ≤ 4.5V, VLED up to 4V @ 120mA | Contact Factory | |
| DC633A | LTC3202EDD | High Efficiency White LED Driver | Contact Factory | |
| Buy Now | |||
Applications
- White LED Backlighting
- Programmable Boost Current Source
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Design Tools
LTspice
LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice
Models for the following parts are available in LTspice:
LTC3202
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.
