LT1765
PRODUCTIONMonolithic 3A, 1.25MHz Step-Down Switching Regulator
- Part Models
- 12
- 1ku List Price
- Starting From $7.03
Overview
- 3A Switch in a Thermally Enhanced 16-Lead TSSOP or 8-Lead SO Package
- Constant 1.25MHz Switching Frequency
- Wide Operating Voltage Range: 3V to 25V
- High Efficiency 0.09Ω Switch
- 1.2V Feedback Reference Voltage
- Uses Low Profile Surface Mount Components
- Low Shutdown Current: 15µA
- Synchronizable to 2MHz
- Current Mode Loop Control
- Constant Maximum Switch Current Rating at All Duty Cycles*
- Available in 8-Lead SO and 16-Lead Thermally Enhanced TSSOP Packages
The LT1765 is a 1.25MHz monolithic buck switching regulator. A high efficiency 3A, 0.09Ω switch is included on the die together with all the control circuitry required to construct a high frequency, current mode switching regulator. Current mode control provides fast transient response and excellent loop stability.
New design techniques achieve high efficiency at high switching frequencies over a wide operating voltage range. A low dropout internal regulator maintains consistent performance over a wide range of inputs from 24V systems to Li-Ion batteries. An operating supply current of 1mA improves efficiency, especially at lower output currents. Shutdown reduces quiescent current to 15µA. Maximum switch current remains constant at all duty cycles. Synchronization allows an external logic level signal to increase the internal oscillator into the range of 1.6MHz to 2MHz.
Full cycle-by-cycle current control and thermal shutdown are provided. High frequency operation allows the reduction of input and output filtering components and permits the use of chip inductors.
Applications
- DSL Modems
- Portable Computers
- Regulated Wall Adapters
- Battery-Powered Systems
- Distributed Power
Documentation
Data Sheet 1
User Guide 2
Technical Articles 3
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 |
|---|---|---|---|
| LT1765EFE#PBF | 16-Lead TSSOP w/ EP | ||
| LT1765EFE#TRPBF | 16-Lead TSSOP w/ EP | ||
| LT1765EFE-1.8#PBF | 16-Lead TSSOP w/ EP | ||
| LT1765EFE-1.8#TRPBF | 16-Lead TSSOP w/ EP | ||
| LT1765EFE-2.5#PBF | 16-Lead TSSOP w/ EP | ||
| LT1765EFE-2.5#TRPBF | 16-Lead TSSOP w/ EP | ||
| LT1765EFE-3.3#PBF | 16-Lead TSSOP w/ EP | ||
| LT1765EFE-3.3#TRPBF | 16-Lead TSSOP w/ EP | ||
| LT1765EFE-5#PBF | 16-Lead TSSOP w/ EP | ||
| LT1765EFE-5#TRPBF | 16-Lead TSSOP w/ EP | ||
| LT1765ES8#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1765ES8#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL |
||
| LT1765EFE#PBF | PRODUCTION | |
| LT1765EFE#TRPBF | PRODUCTION | |
| LT1765EFE-1.8#PBF | PRODUCTION | |
| LT1765EFE-1.8#TRPBF | PRODUCTION | |
| LT1765EFE-2.5#PBF | PRODUCTION | |
| LT1765EFE-2.5#TRPBF | PRODUCTION | |
| LT1765EFE-3.3#PBF | PRODUCTION | |
| LT1765EFE-3.3#TRPBF | PRODUCTION | |
| LT1765EFE-5#PBF | PRODUCTION | |
| LT1765EFE-5#TRPBF | PRODUCTION | |
|
May 18, 2026 - 26_0072 Epoxy Change for Select TSSOP Products |
||
| LT1765EFE-1.8#PBF | PRODUCTION | |
| LT1765EFE-1.8#TRPBF | PRODUCTION | |
| LT1765EFE-2.5#PBF | PRODUCTION | |
| LT1765EFE-2.5#TRPBF | PRODUCTION | |
| LT1765EFE-3.3#PBF | PRODUCTION | |
| LT1765EFE-3.3#TRPBF | PRODUCTION | |
| LT1765EFE-5#PBF | PRODUCTION | |
| LT1765EFE-5#TRPBF | PRODUCTION | |
|
Oct 24, 2024 - 24_0246 Migrating Bottom Trace Code Marking to Top Side Laser Marking for SOIC_N Package |
||
| LT1765ES8#PBF | PRODUCTION | |
| LT1765ES8#TRPBF | PRODUCTION | |
|
Oct 12, 2022 - 22_0255 Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2) |
||
| LT1765ES8#PBF | PRODUCTION | |
| LT1765ES8#TRPBF | PRODUCTION | |
|
Jun 11, 2021 - 21_0060 Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM |
||
| LT1765ES8#PBF | PRODUCTION | |
| LT1765ES8#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
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Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LT1765
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.
