LT1976/LT1976B - High Voltage 1.5A, 200kHz Step-Down Switching Regulator with 100µA Quiescent Current
Features
- Wide Input Range: 3.3V to 60V
- 1.5A Peak Switch Current (LT1976)
- 100µA Quiescent Current (LT1976)
- 1.6mA Quiescent Current (LT1976B)
- Low Shutdown Current: IQ < 1µA
- Power Good Flag with Programmable Threshold
- Load Dump Protection to 60V
- 200kHz Switching Frequency
- Saturating Switch Design: 0.2Ω On-Resistance
- Peak Switch Current Maintained Over Full Duty Cycle Range
- 1.25V Feedback Reference Voltage
- Easily Synchronizable
- Soft-Start Capability
- Small 16-Pin Thermally Enhanced TSSOP Package
AEC-Q100 data available for specific packages
Typical Application
Description
The LT1976/LT1976B are 200kHz monolithic step-down switching regulators that accept input voltages 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. Current mode topology is used for fast transient response and good loop stability.Innovative design techniques along with a new high voltage process achieve high efficiency over a wide input range. Efficiency is maintained over a wide output current range by employing Burst Mode operation at low currents, utilizing the output to bias the internal circuitry, and by using a supply boost capacitor to fully saturate the power switch. The LT1976B does not shift into Burst Mode operation at low currents, eliminating low frequency output ripple at the expense of efficiency. Patented circuitry maintains peak switch current over the full duty cycle range.* Shutdown reduces input supply current to less than 1µA. External synchronization can be implemented by driving the SYNC pin with logic-level inputs. A single capacitor from the CSS pin to the output provides a controlled output voltage ramp (soft-start). The devices also have a power good flag with a programmable threshold and time-out and thermal shutdown protection.
The LT1976/LT1976B are available in a 16-pin TSSOP package with Exposed Pad leadframe for low thermal resistance.
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 |
|---|---|---|---|---|---|
| LT1976BEFE#PBF | TSSOP-16 | FE | E | 05-08-1663 (BC) | Yes |
| LT1976BEFE#TRPBF | TSSOP-16 | FE | E | 05-08-1663 (BC) | Yes |
| LT1976BIFE#PBF | TSSOP-16 | FE | I | 05-08-1663 (BC) | Yes |
| LT1976BIFE#TRPBF | TSSOP-16 | FE | I | 05-08-1663 (BC) | Yes |
| LT1976EFE#PBF | TSSOP-16 | FE | E | 05-08-1663 (BC) | Yes |
| LT1976EFE#TRPBF | TSSOP-16 | FE | E | 05-08-1663 (BC) | Yes |
| LT1976HFE#PBF | TSSOP-16 | FE | H | 05-08-1663 (BC) | Yes |
| LT1976HFE#TRPBF | TSSOP-16 | FE | H | 05-08-1663 (BC) | Yes |
| LT1976IFE#PBF | TSSOP-16 | FE | I | 05-08-1663 (BC) | Yes |
| LT1976IFE#TRPBF | TSSOP-16 | FE | I | 05-08-1663 (BC) | 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 | |
|---|---|---|---|---|---|---|
| LT1976BEFE#PBF | TSSOP-16 | E | $5.00 | $3.50 | Yes | |
| LT1976BEFE#TRPBF | TSSOP-16 | E | $3.56 | Yes | ||
| LT1976BIFE#PBF | TSSOP-16 | I | $6.00 | $4.20 | Yes | |
| LT1976BIFE#TRPBF | TSSOP-16 | I | $4.26 | Yes | ||
| LT1976EFE#PBF | TSSOP-16 | E | $5.71 | $4.00 | Yes | |
| LT1976EFE#TRPBF | TSSOP-16 | E | $4.12 | Yes | ||
| LT1976HFE#PBF | TSSOP-16 | H | $6.93 | $4.85 | Yes | |
| LT1976HFE#TRPBF | TSSOP-16 | H | $4.97 | Yes | ||
| LT1976IFE#PBF | TSSOP-16 | I | $6.57 | $4.60 | Yes | |
| LT1976IFE#TRPBF | TSSOP-16 | I | $4.72 | 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 |
|---|---|---|---|
| DC481A | LT1976IFE Demo Board | 200kHz, 4V ≤ VIN ≤ 60V, 3.3Vout @ 1A | $100.00 | |
| DC977A | LT1976BEFE Demo Board | 200kHz, Non-Burst Mode, 4V ≤ VIN ≤ 60V, 3.3Vout @ 1A | Contact Factory | |
| 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 | |
|---|---|---|---|---|---|---|
| LT1976BIFE#PBF | TSSOP-16 | I | $6.00 | $4.20 | Yes | |
| LT1976BIFE#TRPBF | TSSOP-16 | I | $4.26 | Yes | ||
| LT1976HFE#PBF | TSSOP-16 | H | $6.93 | $4.85 | Yes | |
| LT1976HFE#TRPBF | TSSOP-16 | H | $4.97 | Yes | ||
| LT1976IFE#PBF | TSSOP-16 | I | $6.57 | $4.60 | Yes | |
| LT1976IFE#TRPBF | TSSOP-16 | I | $4.72 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- High Voltage Power Conversion
- 14V and 42V Automotive Systems
- Industrial Power Systems
- Distributed Power Systems
- Battery-Powered 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
To launch a ready to run LTspice demonstration circuit for this part:
- Step 1: If you have not installed LTspice on this computer, download and install LTspice
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To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.
Models for the following parts are available in LTspice:
LT1976
LT1976B
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.
