LTC1147
PRODUCTIONHigh Efficiency Step-Down Switching Regulator Controllers
- Part Models
- 18
- 1ku List Price
- Starting From $4.69
Overview
- Very High Efficiency: Over 95% Possible
- Wide VIN Range: 3.5V to 16V
- Current Mode Operation for Excellent Line and Load Transient Response
- High Efficiency Maintained Over Three Decades of Output Current
- Low 160µA Standby Current at Light Loads
- Logic Controlled Micropower Shutdown: IQ <20µA
- Short-Circuit Protection
- Very Low Dropout Operation: 100% Duty Cycle
- High Efficiency in a Small Amount of Board Space
- Output Can Be Externally Held High in Shutdown
- Available in 8-Pin SO Package
The LTC1147 series are step-down switching regulator controllers featuring automatic BurstMode™ operation to maintain high efficiencies at low output currents. These devices drive an external P-channel power MOSFET at switching frequencies exceeding 400kHz using a constant off-time current mode architecture providing constant ripple current in the inductor.
The operating current level is user-programmable via an external current sense resistor. Wide input supply range allows operation from 3.5V to 14V (16V maximum). Constant off-time architecture provides low dropout regulation limited by only the RDS(ON) of the external MOSFET and resistance of the inductor and current sense resistor.
The LTC1147 series incorporates automatic power saving Burst Mode operation to reduce switching losses when load currents drop below the level required for continuous operation. Standby power is reduced to only 2mW at VIN = 10V (at IOUT = 0). Load currents in Burst Mode operation are typically 0mA to 300mA.
For applications where even higher efficiency is required, refer to the LTC1148 data sheet and Application Note 54.
Applications
- Notebook and Palmtop Computers
- Portable Instruments
- Battery-Operated Digital Devices
- Cellular Telephones
- DC Power Distribution Systems
- GPS Systems
Documentation
Data Sheet 1
Application Note 3
Design Note 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 |
|---|---|---|---|
| LTC1147CN8-3.3#PBF | 8-Lead PDIP (Narrow 0.3 Inch) | ||
| LTC1147CN8-5#PBF | 8-Lead PDIP (Narrow 0.3 Inch) | ||
| LTC1147CS8-3.3#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1147CS8-3.3#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1147CS8-5#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1147CS8-5#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1147HVCS8-3.3#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1147HVCS8-3.3#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1147IS8-3.3#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1147IS8-3.3#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1147IS8-5#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1147IS8-5#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1147LCS8#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1147LCS8#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1147LCS8-3.3#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1147LCS8-3.3#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1147LIS8#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1147LIS8#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Oct 8, 2024 - 24_0234 Migrating Bottom Trace Code Marking to Top Side Laser Marking for PDIP Package |
||
| LTC1147CN8-3.3#PBF | PRODUCTION | |
| LTC1147CN8-5#PBF | PRODUCTION | |
|
Oct 11, 2022 - 22_0241 Epoxy Change from Henkel 8290 to 8290A for PDIP Package |
||
| LTC1147CN8-3.3#PBF | PRODUCTION | |
| LTC1147CN8-5#PBF | PRODUCTION | |
|
Aug 6, 2022 - 22_0172 Laser Top Mark Conversion for PDIP Packages Assembled in ADPG [PNG] |
||
| LTC1147CN8-3.3#PBF | PRODUCTION | |
| LTC1147CN8-5#PBF | PRODUCTION | |
|
Dec 14, 2023 - 22_0255 Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2) |
||
| LTC1147CS8-3.3#PBF | PRODUCTION | |
| LTC1147CS8-3.3#TRPBF | PRODUCTION | |
| LTC1147CS8-5#PBF | PRODUCTION | |
| LTC1147CS8-5#TRPBF | PRODUCTION | |
| LTC1147IS8-3.3#PBF | PRODUCTION | |
| LTC1147IS8-3.3#TRPBF | PRODUCTION | |
| LTC1147IS8-5#PBF | PRODUCTION | |
| LTC1147IS8-5#TRPBF | PRODUCTION | |
| LTC1147LCS8#PBF | PRODUCTION | |
| LTC1147LCS8#TRPBF | PRODUCTION | |
| LTC1147LCS8-3.3#PBF | PRODUCTION | |
| LTC1147LCS8-3.3#TRPBF | PRODUCTION | |
| LTC1147LIS8#PBF | PRODUCTION | |
| LTC1147LIS8#TRPBF | PRODUCTION | |
|
Jun 16, 2021 - 21_0026 Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM |
||
| LTC1147CS8-3.3#PBF | PRODUCTION | |
| LTC1147CS8-3.3#TRPBF | PRODUCTION | |
| LTC1147CS8-5#PBF | PRODUCTION | |
| LTC1147CS8-5#TRPBF | PRODUCTION | |
| LTC1147IS8-3.3#PBF | PRODUCTION | |
| LTC1147IS8-3.3#TRPBF | PRODUCTION | |
| LTC1147IS8-5#PBF | PRODUCTION | |
| LTC1147IS8-5#TRPBF | PRODUCTION | |
| LTC1147LCS8#PBF | PRODUCTION | |
| LTC1147LCS8#TRPBF | PRODUCTION | |
| LTC1147LCS8-3.3#PBF | PRODUCTION | |
| LTC1147LCS8-3.3#TRPBF | PRODUCTION | |
| LTC1147LIS8#PBF | PRODUCTION | |
| LTC1147LIS8#TRPBF | PRODUCTION | |
|
Oct 12, 2022 - 22_0255 Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2) |
||
| LTC1147HVCS8-3.3#PBF | PRODUCTION | |
| LTC1147HVCS8-3.3#TRPBF | PRODUCTION | |
|
Nov 11, 2021 - 21_0060 Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM |
||
| LTC1147HVCS8-3.3#PBF | PRODUCTION | |
| LTC1147HVCS8-3.3#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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LTspice
Models for the following parts are available in LTspice:
- LTC1147-3.3
- LTC1147-5
- LTC1147L
- LTC1147L-3.3
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
LTC1147CS8-3.3 | High Efficiency 5V-3.3 Switching Regulator
Resources
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