LT3957
PRODUCTIONBoost, Flyback, SEPIC and Inverting Converter with 5A, 40V Switch
- Part Models
- 4
- 1ku List Price
- Starting From $4.48
Overview
- Wide Input Voltage Range: 3V to 40V
- Single Feedback Pin for Positive or Negative Output Voltage
- Internal 5A/40V Power Switch
- Current Mode Control Provides Excellent Transient Response
- Programmable Operating Frequency (100kHz to 1MHz) with One External Resistor
- Synchronizable to an External Clock
- Low Shutdown Current < 1μA
- Internal 5.2V Low Dropout Voltage Regulator
- Programmable Input Undervoltage Lockout with Hysteresis
- Programmable Soft-Start
- Thermally Enhanced QFN (5mm × 6mm) Package
The LT3957 is a wide input range, current mode DC/DC converter which is capable of generating either positive or negative output voltages. It can be configured as either a boost, flyback, SEPIC or inverting converter. It features an internal low side N-channel power MOSFET rated for 40V at 5A and driven from an internal regulated 5.2V supply. The fixed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages.
The operating frequency of LT3957 can be set with an external resistor over a 100kHz to 1MHz range, and can be synchronized to an external clock using the SYNC pin. A minimum operating supply voltage of 3V, and a low shutdown quiescent current of less than 1μA, make the LT3957 ideally suited for battery-powered systems.
The LT3957 features soft-start and frequency foldback functions to limit inductor current during start-up.
| Features | |
| LT3957 | - |
| LT3957A | Improved Load Transient Performance |
Applications
- Automotive
- Telecom
- Industrial
Documentation
Data Sheet 1
User Guide 1
Technical Articles 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LT3957EUHE#PBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) | ||
| LT3957EUHE#TRPBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) | ||
| LT3957IUHE#PBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) | ||
| LT3957IUHE#TRPBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| LT3957A | PRODUCTION | Boost, Flyback, SEPIC and Inverting Converter with 5A, 40V Switch |
Tools & Simulations
LTspice 2
- LT3957 Demo Circuit - 5A, 40V Boost Converter (3-6V to 12V @ 800mA)
- LT3957 Demo Circuit - 5A, 40V Boost Converter (12V to 24V @ 600mA)
Models for the following parts are available in LTspice:
- LT3957
- LT3957A
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
