LT1976
LT1976B
High Voltage 1.5A, 200kHz Step-Down Switching Regulator with 100µA Quiescent Current
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Overview
Features and Benefits
- 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
Product Details
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.
Applications
- High Voltage Power Conversion
- 14V and 42V Automotive Systems
- Industrial Power Systems
- Distributed Power Systems
- Battery-Powered Systems
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (2)
Documentation & Resources
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R303 Reliability Data3/23/2018
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DC977A - Demo Manual9/24/2009
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DC481A - Demo Manual9/24/2009
Tools & Simulations
LTspice
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.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.
Models for the following parts are available in LTspice:
LT1976
LT1976B
Product Recommendations
LT1976 Companion Parts
Design Resources
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 Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| LT1976BEFE#PBF | Material Declaration | Reliability Data | 16-Lead TSSOP w/ EP | |
| LT1976BEFE#TRPBF | Material Declaration | Reliability Data | 16-Lead TSSOP w/ EP | |
| LT1976BIFE#PBF | Material Declaration | Reliability Data | 16-Lead TSSOP w/ EP | |
| LT1976BIFE#TRPBF | Material Declaration | Reliability Data | 16-Lead TSSOP w/ EP | |
| LT1976EFE#PBF | Material Declaration | Reliability Data | 16-Lead TSSOP w/ EP | |
| LT1976EFE#TRPBF | Material Declaration | Reliability Data | 16-Lead TSSOP w/ EP | |
| LT1976HFE#PBF | Material Declaration | Reliability Data | 16-Lead TSSOP w/ EP | |
| LT1976HFE#TRPBF | Material Declaration | Reliability Data | 16-Lead TSSOP w/ EP | |
| LT1976IFE#PBF | Material Declaration | Reliability Data | 16-Lead TSSOP w/ EP | |
| LT1976IFE#TRPBF | Material Declaration | Reliability Data | 16-Lead TSSOP w/ EP | |
| Wafer Fabrication Data | R303 Reliability Data |
PCN-PDN Information
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Support & Discussions
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Evaluation Boards
Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.