LTC3429 - 600mA, 500kHz Micropower Synchronous Boost Converter with Output Disconnect
Features
- Up to 96% Efficiency
- True Output Load Disconnect
- Inrush Current Limiting and Internal Soft-Start
- Low Voltage Start-Up: 0.85V
- Automatic Burst Mode® Operation with IQ ~ 20µA
- Continuous Switching at Light Loads (LTC3429B)
- Internal Synchronous Rectifier
- Current Mode Control with Internal Compensation
- Short-Circuit Protection
- 500kHz Fixed Frequency Switching
- Input Range: 0.5V to 4.4V
- Output Range: 2.5V to 4.3V (Up to 5V with Schottky)
- Shutdown Current: <1µA
- Antiringing Control Minimizes EMI
- Tiny External Components
- Low Profile (1mm) SOT-23 Package
Typical Application
Description
The LTC3429/LTC3429B are high efficiency synchronous, fixed frequency, step-up DC/DC converters with true output load disconnect, inrush current limiting and softstart in a low profile 6-lead ThinSOT package. These devices are capable of supplying 100mA from a single AA cell input or 250mA from a 2-cell AA with a 3.3V output.
A switching frequency of 500kHz minimizes overall solution footprint by allowing the use of tiny, low profile inductors and ceramic capacitors. Current mode PWM control with internal compensation reduces external parts count thereby saving critical board real estate. The LTC3429 shifts automatically to power saving Burst Mode operation at light loads while the LTC3429B features continuous switching at light loads. Antiringing control circuitry reduces EMI concerns by damping the inductor in discontinuous mode.
The devices also feature low shutdown current of under 1µA. The true output disconnect feature allows the output to be completely discharged in shutdown. It also limits the inrush of current during start-up, minimizing surge currents seen by the input supply.
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 |
|---|---|---|---|---|---|
| LTC3429BES6#PBF | SOT-23 | S6 | E | 05-08-1636 | Yes |
| LTC3429BES6#TRMPBF | SOT-23 | S6 | E | 05-08-1636 | Yes |
| LTC3429BES6#TRPBF | SOT-23 | S6 | E | 05-08-1636 | Yes |
| LTC3429ES6#PBF | SOT-23 | S6 | E | 05-08-1636 | Yes |
| LTC3429ES6#TRMPBF | SOT-23 | S6 | E | 05-08-1636 | Yes |
| LTC3429ES6#TRPBF | SOT-23 | S6 | E | 05-08-1636 | 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 | |
|---|---|---|---|---|---|---|
| LTC3429BES6#PBF | SOT-23 | E | $2.38 | Yes | ||
| LTC3429BES6#TRMPBF | SOT-23 | E | $2.38 | $2.03 | Yes | |
| LTC3429BES6#TRPBF | SOT-23 | E | $2.38 | $2.01 | Yes | |
| LTC3429ES6#PBF | SOT-23 | E | $2.38 | Yes | ||
| LTC3429ES6#TRMPBF | SOT-23 | E | $2.38 | $2.03 | Yes | |
| LTC3429ES6#TRPBF | SOT-23 | E | $2.38 | $2.01 | 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 |
|---|---|---|---|
| DC559A-A | LTC3429ES6 Demo Board | 1V ≤ VIN ≤ 3.3V, Vout = 3.3V @ Up to 250mA | $100.00 | |
| DC559A-B | LTC3429BES6 Demo Board | 1V ≤ VIN ≤ 3.3V, Vout = 3.3V @ Up to 250mA | $100.00 | |
| Buy Now | |||
Applications
- MP3 Players
- Digital Cameras
- LCD Bias Supplies
- Handheld Instruments
- Wireless Handsets
- GPS Receivers
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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:
LTC3429
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.
