LTC1474
PRODUCTIONLow Quiescent Current High Efficiency Step-Down Converters
- Part Models
- 18
- 1ku List Price
- Starting From $6.21
Overview
- High Efficiency: Over 92% Possible
- Very Low Standby Current: 10µA Typ
- Available in Space Saving 8-Lead MSOP Package
- Internal 1.4Ω Power Switch (VIN = 10V)
- Wide VIN Range: 3V to 18V Operation
- Very Low Dropout Operation: 100% Duty Cycle
- Low-Battery Detector Functional During Shutdown
- Programmable Current Limit with Optional Current Sense Resistor (10mA to 400mA Typ)
- Short-Circuit Protection
- Few External Components Required
- Active Low Micropower Shutdown: IQ = 6µA Typ
- Pushbutton On/Off (LTC1475 Only)
- 3.3V, 5V and Adjustable Output Versions
The LTC1474/LTC1475 series are high efficiency step-down converters with internal P-channel MOSFET power switches that draw only 10µA typical DC supply current at no load while maintaining output voltage. The LTC1474 uses logic-controlled shutdown while the LTC1475 features pushbutton on/off.
The low supply current coupled with Burst Mode™ operation enables the LTC1474/LTC1475 to maintain high efficiency over a wide range of loads. These features, along with their capability of 100% duty cycle for low dropout and wide input supply range, make the LTC1474/LTC1475 ideal for moderate current (up to 300mA) battery-powered applications.
The peak switch current is user-programmable with an optional sense resistor (defaults to 325mA minimum if not used) providing a simple means for optimizing the design for lower current applications. The peak current control also provides short-circuit protection and excellent startup behavior. A low-battery detector that remains functional in shutdown is provided .
The LTC1474/LTC1475 series availability in 8-lead MSOP and SO packages and need for few additional components provide for a minimum area solution.
Applications
- Cellular Telephones and Wireless Modems
- 4mA to 20mA Current Loop Step-Down Converter
- Portable Instruments
- Battery-Operated Digital Devices
- Battery Chargers
- Inverting Converters
- Intrinsic Safety Applications
Documentation
Data Sheet 1
User Guide 1
Application Note 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 |
|---|---|---|---|
| LTC1474CMS8#PBF | 8-Lead MSOP | ||
| LTC1474CMS8#TRPBF | 8-Lead MSOP | ||
| LTC1474CMS8-3.3#PBF | 8-Lead MSOP | ||
| LTC1474CMS8-3.3#TRPBF | 8-Lead MSOP | ||
| LTC1474CMS8-5#PBF | 8-Lead MSOP | ||
| LTC1474CMS8-5#TRPBF | 8-Lead MSOP | ||
| LTC1474CS8#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1474CS8#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1474CS8-3.3#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1474CS8-3.3#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1474CS8-5#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1474CS8-5#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1474IS8#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1474IS8#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1474IS8-3.3#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1474IS8-3.3#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1474IS8-5#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1474IS8-5#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jun 5, 2024 - 24_0004 Epoxy Change from Henkel 8290 to 8290A for MSOP (3) |
||
| LTC1474CMS8#PBF | PRODUCTION | |
| LTC1474CMS8#TRPBF | PRODUCTION | |
| LTC1474CMS8-3.3#PBF | PRODUCTION | |
| LTC1474CMS8-3.3#TRPBF | PRODUCTION | |
| LTC1474CMS8-5#PBF | PRODUCTION | |
| LTC1474CMS8-5#TRPBF | PRODUCTION | |
|
Feb 3, 2020 - 20_0128 Laser Top Mark for 8 Lead MSOP Packages Assembled in ADPG and UTAC |
||
| LTC1474CMS8#PBF | PRODUCTION | |
| LTC1474CMS8#TRPBF | PRODUCTION | |
| LTC1474CMS8-3.3#PBF | PRODUCTION | |
| LTC1474CMS8-3.3#TRPBF | PRODUCTION | |
| LTC1474CMS8-5#PBF | PRODUCTION | |
| LTC1474CMS8-5#TRPBF | PRODUCTION | |
|
Oct 24, 2024 - 24_0246 Migrating Bottom Trace Code Marking to Top Side Laser Marking for SOIC_N Package |
||
| LTC1474CS8#PBF | PRODUCTION | |
| LTC1474CS8#TRPBF | PRODUCTION | |
| LTC1474CS8-3.3#PBF | PRODUCTION | |
| LTC1474CS8-3.3#TRPBF | PRODUCTION | |
| LTC1474CS8-5#PBF | PRODUCTION | |
| LTC1474CS8-5#TRPBF | PRODUCTION | |
| LTC1474IS8#PBF | PRODUCTION | |
| LTC1474IS8#TRPBF | PRODUCTION | |
| LTC1474IS8-3.3#PBF | PRODUCTION | |
| LTC1474IS8-3.3#TRPBF | PRODUCTION | |
| LTC1474IS8-5#PBF | PRODUCTION | |
| LTC1474IS8-5#TRPBF | PRODUCTION | |
|
Dec 14, 2023 - 22_0255 Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2) |
||
| LTC1474CS8#PBF | PRODUCTION | |
| LTC1474CS8#TRPBF | PRODUCTION | |
| LTC1474CS8-3.3#PBF | PRODUCTION | |
| LTC1474CS8-3.3#TRPBF | PRODUCTION | |
| LTC1474CS8-5#PBF | PRODUCTION | |
| LTC1474CS8-5#TRPBF | PRODUCTION | |
| LTC1474IS8-3.3#PBF | PRODUCTION | |
| LTC1474IS8-3.3#TRPBF | PRODUCTION | |
| LTC1474IS8-5#PBF | PRODUCTION | |
| LTC1474IS8-5#TRPBF | PRODUCTION | |
|
Jun 16, 2021 - 21_0026 Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM |
||
| LTC1474CS8#PBF | PRODUCTION | |
| LTC1474CS8#TRPBF | PRODUCTION | |
| LTC1474CS8-3.3#PBF | PRODUCTION | |
| LTC1474CS8-3.3#TRPBF | PRODUCTION | |
| LTC1474CS8-5#PBF | PRODUCTION | |
| LTC1474CS8-5#TRPBF | PRODUCTION | |
| LTC1474IS8#PBF | PRODUCTION | |
| LTC1474IS8#TRPBF | PRODUCTION | |
| LTC1474IS8-3.3#PBF | PRODUCTION | |
| LTC1474IS8-3.3#TRPBF | PRODUCTION | |
| LTC1474IS8-5#PBF | PRODUCTION | |
| LTC1474IS8-5#TRPBF | PRODUCTION | |
|
Oct 12, 2022 - 22_0255 Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2) |
||
| LTC1474IS8#PBF | PRODUCTION | |
| LTC1474IS8#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:
- LTC1474
- LTC1474-3.3
- LTC1474-5
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.
