LT1956
PRODUCTIONHigh Voltage, 1.5A, 500kHz Step-Down Switching Regulators
- Part Models
- 16
- 1ku List Price
- Starting From $5.54
Overview
- Wide Input Range: 5.5V to 60V
- 1.5A Peak Switch Current
- Small 16-Pin SSOP Package or Thermally Enhanced TSSOP Package
- Saturating Switch Design: 0.2Ω
- Peak Switch Current Maintained Over Full Duty Cycle Range
- Constant 500kHz Switching Frequency
- Effective Supply Current: 2.5mA
- Shutdown Current: 25µA
- 1.2V Feedback Reference (LT1956)
- 5V Fixed Output (LT1956-5)
- Easily Synchronizable
- Cycle-by-Cycle Current Limiting
The LT1956/LT1956-5 are 500kHz monolithic buck switching regulators with an input voltage capability up to 60V. A high efficiency 1.5A, 0.2Ω switch is included on the die along with all the necessary oscillator, control and logic circuitry. A current mode architecture provides fast transient response and good loop stability.
Special design techniques and a new high voltage process achieve high efficiency over a wide input range. Efficiency is maintained over a wide output current range by using the output to bias the circuitry and by utilizing a supply boost capacitor to saturate the power switch. Patented circuitry maintains peak switch current over the full duty cycle range*. A shutdown pin reduces supply current to 25µA and the device can be externally synchronized from 580kHz to 700kHz with a logic level input.
The LT1956/LT1956-5 are available in fused-lead 16-pin SSOP and thermally enhanced TSSOP packages.
Applications
- High Voltage, Industrial and Automotive
- Portable Computers
- Battery-Powered Systems
- Battery Chargers
- Distributed Power Systems
Documentation
Data Sheet 1
User Guide 2
Design Note 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 |
|---|---|---|---|
| LT1956EFE#PBF | 16-Lead TSSOP w/ EP | ||
| LT1956EFE#TRPBF | 16-Lead TSSOP w/ EP | ||
| LT1956EFE-5#PBF | 16-Lead TSSOP w/ EP | ||
| LT1956EFE-5#TRPBF | 16-Lead TSSOP w/ EP | ||
| LT1956EGN#PBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LT1956EGN#TRPBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LT1956EGN-5#PBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LT1956EGN-5#TRPBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LT1956IFE#PBF | 16-Lead TSSOP w/ EP | ||
| LT1956IFE#TRPBF | 16-Lead TSSOP w/ EP | ||
| LT1956IFE-5#PBF | 16-Lead TSSOP w/ EP | ||
| LT1956IFE-5#TRPBF | 16-Lead TSSOP w/ EP | ||
| LT1956IGN#PBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LT1956IGN#TRPBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LT1956IGN-5#PBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LT1956IGN-5#TRPBF | 16-Lead SSOP (Narrow 0.15 Inch) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL |
||
| LT1956EFE#PBF | PRODUCTION | |
| LT1956EFE#TRPBF | PRODUCTION | |
| LT1956EFE-5#PBF | PRODUCTION | |
| LT1956EFE-5#TRPBF | PRODUCTION | |
| LT1956IFE#PBF | PRODUCTION | |
| LT1956IFE#TRPBF | PRODUCTION | |
| LT1956IFE-5#PBF | PRODUCTION | |
| LT1956IFE-5#TRPBF | PRODUCTION | |
|
Oct 3, 2024 - 24_0235 (QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking |
||
| LT1956EGN#PBF | PRODUCTION | |
| LT1956EGN#TRPBF | PRODUCTION | |
| LT1956EGN-5#PBF | PRODUCTION | |
| LT1956EGN-5#TRPBF | PRODUCTION | |
| LT1956IGN#PBF | PRODUCTION | |
| LT1956IGN#TRPBF | PRODUCTION | |
| LT1956IGN-5#PBF | PRODUCTION | |
| LT1956IGN-5#TRPBF | PRODUCTION | |
|
Oct 11, 2022 - 22_0235 Epoxy Change from Henkel 8290 to 8290A for GN Package |
||
| LT1956EGN#PBF | PRODUCTION | |
| LT1956EGN#TRPBF | PRODUCTION | |
| LT1956EGN-5#PBF | PRODUCTION | |
| LT1956EGN-5#TRPBF | PRODUCTION | |
| LT1956IGN#PBF | PRODUCTION | |
| LT1956IGN#TRPBF | PRODUCTION | |
| LT1956IGN-5#PBF | PRODUCTION | |
| LT1956IGN-5#TRPBF | PRODUCTION | |
|
Apr 6, 2022 - 22_0066 Laser Top Mark for 16QSOP Assembled in ADPG [PNG] |
||
| LT1956EGN#PBF | PRODUCTION | |
| LT1956EGN#TRPBF | PRODUCTION | |
| LT1956EGN-5#PBF | PRODUCTION | |
| LT1956EGN-5#TRPBF | PRODUCTION | |
| LT1956IGN#PBF | PRODUCTION | |
| LT1956IGN#TRPBF | PRODUCTION | |
| LT1956IGN-5#PBF | PRODUCTION | |
| LT1956IGN-5#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
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| Circuit Monitors 1 | ||
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| Hot Swap Controllers 1 | ||
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| Oscillators 1 | ||
| LTC6909 | PRODUCTION | 1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation |
| Power System Management (PSM) & Sequencers 1 | ||
| LTC2974 | RECOMMENDED FOR NEW DESIGNS | 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement |
Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LT1956
- LT1956-5
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.
Evaluation Kits
LT1956EFE | 1A, 500kHz High Voltage Buck Converter, VIN = 7V - 25V, VOUT = 5V @ 1A
Resources
LT1956 Signal Chain Evaluation Board | 60V/1.5A Inverting Buck Converter
Resources
LT1956 Signal Chain Evaluation Board | 60V/1.5A Buck Converter