LT1956 - High Voltage, 1.5A, 500kHz Step-Down Switching Regulators
Features
- 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: 0.2 Ohms
- 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
AEC-Q100 data available for specific packages
Typical Application
Description
The LT1956/LT1956-5 are 500kHz monolithic buck switching regulators with an input voltage capability up to 60V. A high efficiency 1.5A, 0.2 Ohm 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.
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 |
|---|---|---|---|---|---|
| LT1956EFE-5#PBF | TSSOP-16 | FE | E | 05-08-1663 (BB) | Yes |
| LT1956EFE-5#TRPBF | TSSOP-16 | FE | E | 05-08-1663 (BB) | Yes |
| LT1956EFE#PBF | TSSOP-16 | FE | E | 05-08-1663 (BB) | Yes |
| LT1956EFE#TRPBF | TSSOP-16 | FE | E | 05-08-1663 (BB) | Yes |
| LT1956EGN-5#PBF | SSOP-16 | GN | E | 05-08-1641 (GN16) | Yes |
| LT1956EGN-5#TRPBF | SSOP-16 | GN | E | 05-08-1641 (GN16) | Yes |
| LT1956EGN#PBF | SSOP-16 | GN | E | 05-08-1641 (GN16) | Yes |
| LT1956EGN#TRPBF | SSOP-16 | GN | E | 05-08-1641 (GN16) | Yes |
| LT1956IFE-5#PBF | TSSOP-16 | FE | I | 05-08-1663 (BB) | Yes |
| LT1956IFE-5#TRPBF | TSSOP-16 | FE | I | 05-08-1663 (BB) | Yes |
| LT1956IFE#PBF | TSSOP-16 | FE | I | 05-08-1663 (BB) | Yes |
| LT1956IFE#TRPBF | TSSOP-16 | FE | I | 05-08-1663 (BB) | Yes |
| LT1956IGN-5#PBF | SSOP-16 | GN | I | 05-08-1641 (GN16) | Yes |
| LT1956IGN-5#TRPBF | SSOP-16 | GN | I | 05-08-1641 (GN16) | Yes |
| LT1956IGN#PBF | SSOP-16 | GN | I | 05-08-1641 (GN16) | Yes |
| LT1956IGN#TRPBF | SSOP-16 | GN | I | 05-08-1641 (GN16) | 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 | |
|---|---|---|---|---|---|---|
| LT1956EFE-5#PBF | TSSOP-16 | E | $5.36 | $3.75 | Yes | |
| LT1956EFE-5#TRPBF | TSSOP-16 | E | $3.87 | Yes | ||
| LT1956EFE#PBF | TSSOP-16 | E | $5.36 | $3.75 | Yes | |
| LT1956EFE#TRPBF | TSSOP-16 | E | $3.87 | Yes | ||
| LT1956EGN-5#PBF | SSOP-16 | E | $4.32 | $3.65 | Yes | |
| LT1956EGN-5#TRPBF | SSOP-16 | E | $3.71 | Yes | ||
| LT1956EGN#PBF | SSOP-16 | E | $4.32 | $3.65 | Yes | |
| LT1956EGN#TRPBF | SSOP-16 | E | $3.71 | Yes | ||
| LT1956IFE-5#PBF | TSSOP-16 | I | $6.36 | $4.45 | Yes | |
| LT1956IFE-5#TRPBF | TSSOP-16 | I | $4.57 | Yes | ||
| LT1956IFE#PBF | TSSOP-16 | I | $6.36 | $4.45 | Yes | |
| LT1956IFE#TRPBF | TSSOP-16 | I | $4.57 | Yes | ||
| LT1956IGN-5#PBF | SSOP-16 | I | $5.15 | $4.35 | Yes | |
| LT1956IGN-5#TRPBF | SSOP-16 | I | $4.41 | Yes | ||
| LT1956IGN#PBF | SSOP-16 | I | $5.15 | $4.35 | Yes | |
| LT1956IGN#TRPBF | SSOP-16 | I | $4.41 | 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 |
|---|---|---|---|
| DC423B | LT1956EFE | 1A, 500kHz High Voltage Buck Converter, Vin = 7V - 25V, Vout = 5V @ 1A | $100.00 | |
| 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 | |
|---|---|---|---|---|---|---|
| LT1956IFE-5#PBF | TSSOP-16 | I | $6.36 | $4.45 | Yes | |
| LT1956IFE-5#TRPBF | TSSOP-16 | I | $4.57 | Yes | ||
| LT1956IFE#PBF | TSSOP-16 | I | $6.36 | $4.45 | Yes | |
| LT1956IFE#TRPBF | TSSOP-16 | I | $4.57 | Yes | ||
| LT1956IGN-5#PBF | SSOP-16 | I | $5.15 | $4.35 | Yes | |
| LT1956IGN-5#TRPBF | SSOP-16 | I | $4.41 | Yes | ||
| LT1956IGN#PBF | SSOP-16 | I | $5.15 | $4.35 | Yes | |
| LT1956IGN#TRPBF | SSOP-16 | I | $4.41 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- High Voltage, Industrial and Automotive
- Portable Computers
- Battery-Powered Systems
- Battery Chargers
- Distributed Power Systems
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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:
LT1956
LT1956-5
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.
