LTC1775
PRODUCTIONHigh Power No RSENSE™ Current Mode Synchronous Step-Down Switching Regulator
- Part Models
- 8
- 1ku List Price
- Starting From $8.44
Overview
- Highest Efficiency Current Mode Controller
- No Sense Resistor Required
- 300mV Maximum Current Sense Voltage
- Stable High Current Operation
- Dual N-Channel MOSFET Synchronous Drive
- Wide VIN Range: 4V to 36V
- Wide VOUT Range: 1.19V to VIN
- ±1% 1.19V Reference
- Programmable Fixed Frequency with Injection Lock
- Very Low Drop Out Operation: 99% Duty Cycle
- Forced Continuous Mode Control Pin
- Optional Programmable Soft Start
- Pin Selectable Output Voltage
- Foldback Current Limit
- Output Overvoltage Protection
- Logic Controlled Micropower Shutdown: IQ < 30µA
- Available in 16-Lead Narrow SSOP and SO Packages
The LTC1775 is a synchronous step-down switching regulator controller that drives external N-channel power MOSFETs using few external components. Current mode control with MOSFET VDS sensing eliminates the need for a sense resistor and improves efficiency. Largely similar to the LTC1625, the LTC1775 has twice the maximum sense voltage for high current applications. The frequency of a nominal 150kHz internal oscillator can be synchronized to an external clock over a 1.5:1 frequency range.
Burst Mode™ operation at low load currents reduces switching losses and low dropout operation extends operating time in battery-powered systems. A forced continuous mode control pin can assist secondary winding regulation by disabling Burst Mode operation when the main output is lightly loaded.
Fault protection is provided by foldback current limiting and an output overvoltage comparator. An external capacitor attached to the RUN/SS pin provides soft start capability for supply sequencing. A wide supply range allows operation from 4V (4.3V for LTC1775I) to 36V at the input and 1.19V to VIN at the output.
Applications
- Notebook Computers
- Automotive Electronics
- Battery Chargers
- Distributed Power Systems
Documentation
Data Sheet 1
User Guide 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 |
|---|---|---|---|
| LTC1775CGN#PBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC1775CGN#TRPBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC1775CS#PBF | 16-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1775CS#TRPBF | 16-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1775IGN#PBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC1775IGN#TRPBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC1775IS#PBF | 16-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1775IS#TRPBF | 16-Lead SOIC (Narrow 0.15 Inch) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Oct 3, 2024 - 24_0235 (QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking |
||
| LTC1775CGN#PBF | PRODUCTION | |
| LTC1775CGN#TRPBF | PRODUCTION | |
| LTC1775IGN#PBF | PRODUCTION | |
| LTC1775IGN#TRPBF | PRODUCTION | |
|
Oct 11, 2022 - 22_0235 Epoxy Change from Henkel 8290 to 8290A for GN Package |
||
| LTC1775CGN#PBF | PRODUCTION | |
| LTC1775CGN#TRPBF | PRODUCTION | |
| LTC1775IGN#PBF | PRODUCTION | |
| LTC1775IGN#TRPBF | PRODUCTION | |
|
Apr 6, 2022 - 22_0066 Laser Top Mark for 16QSOP Assembled in ADPG [PNG] |
||
| LTC1775CGN#PBF | PRODUCTION | |
| LTC1775CGN#TRPBF | PRODUCTION | |
| LTC1775IGN#PBF | PRODUCTION | |
| LTC1775IGN#TRPBF | PRODUCTION | |
|
Oct 24, 2024 - 24_0246 Migrating Bottom Trace Code Marking to Top Side Laser Marking for SOIC_N Package |
||
| LTC1775CS#PBF | PRODUCTION | |
| LTC1775CS#TRPBF | PRODUCTION | |
| LTC1775IS#PBF | PRODUCTION | |
| LTC1775IS#TRPBF | PRODUCTION | |
|
Aug 6, 2022 - 22_0173 Laser Top Mark Conversion for SOICN14 and SOICN16 Packages Assembled on ADPG [PNG] |
||
| LTC1775CS#PBF | PRODUCTION | |
| LTC1775CS#TRPBF | PRODUCTION | |
| LTC1775IS#PBF | PRODUCTION | |
| LTC1775IS#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareHardware Ecosystem
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|---|---|---|
| Circuit Monitors 1 | ||
| LTC2960 | RECOMMENDED FOR NEW DESIGNS | 36V Nano-Current Two-Input Voltage Monitor |
| Hot Swap Controllers 1 | ||
| LT4363 | RECOMMENDED FOR NEW DESIGNS | High Voltage Surge Stopper with Current Limit |
| 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:
- LTC1775
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
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