LT1777
PRODUCTIONLow Noise Step-Down Switching Regulator
- Part Models
- 4
- 1ku List Price
- Starting From $4.87
Overview
- Programmable dI/dt Limit
- Internally Limited dV/dt
- High Input Voltage: 48V Max
- 700mA Peak Switch Rating
- True Current Mode Control
- 100kHz Fixed Operating Frequency
- Synchronizable to 250kHz
- Low Supply Current in Shutdown: 30µA
- Low Thermal Resistance 16-Pin SO Package
The LT1777 is a Buck (step-down) regulator designed for noise sensitive applications. It contains a dI/dt limiting circuit programmed via a small external inductor in the switching path. Internal circuitry also generates controlled dV/dt ramp rates.
The monolithic die includes all oscillator, control and protection circuitry. The part can accept operating input voltages as high as 48V, and contains an output switch rated at 700mA peak current. Current mode control offers excellent dynamic input supply rejection and short-circuit protection. The internal control circuitry is normally powered via the VCC pin, thereby minimizing power drawn directly from the VIN supply (see Applications Information). The fused-lead SO16 package and 100kHz switching frequency allow for minimal PC board area requirements.
Applications
- Automotive Cellular and GPS Receivers
- Telecom Power Supplies
- Industrial Instrument Power Supplies
Documentation
Data Sheet 1
User Guide 1
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 |
|---|---|---|---|
| LT1777CS#PBF | 16-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1777CS#TRPBF | 16-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1777IS#PBF | 16-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1777IS#TRPBF | 16-Lead SOIC (Narrow 0.15 Inch) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Oct 24, 2024 - 24_0246 Migrating Bottom Trace Code Marking to Top Side Laser Marking for SOIC_N Package |
||
| LT1777CS#PBF | PRODUCTION | |
| LT1777CS#TRPBF | PRODUCTION | |
| LT1777IS#PBF | PRODUCTION | |
| LT1777IS#TRPBF | PRODUCTION | |
|
Aug 6, 2022 - 22_0173 Laser Top Mark Conversion for SOICN14 and SOICN16 Packages Assembled on ADPG [PNG] |
||
| LT1777CS#PBF | PRODUCTION | |
| LT1777CS#TRPBF | PRODUCTION | |
| LT1777IS#PBF | PRODUCTION | |
| LT1777IS#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
| Parts | Product Life Cycle | Description |
|---|---|---|
| Hot Swap Controllers 1 | ||
| LT4363 | RECOMMENDED FOR NEW DESIGNS | High Voltage Surge Stopper with Current Limit |
| Oscillators 2 | ||
| LTC6909 | PRODUCTION | 1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation |
| LTC6930-X.XX | 32.768kHz to 8.192MHz Precision µPower Oscillators | |
| 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:
- LT1777
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
LT1777CS | 100kHz Low Noise DC-DC Converter, 7.4V to 48V Input, 3.3V or 5VOUT @ 0.5A