LT1949
PRODUCTION600kHz, 1A Switch PWM DC/DC Converter
- Part Models
- 6
- 1ku List Price
- Starting From $4.05
Overview
- 1.1A, 0.5Ω, 30V Internal Switch
- Operates with VIN as Low as 1.5V
- 600kHz Fixed Frequency Operation
- Low-Battery Detector Active in Shutdown
- Low VCESAT Switch: 410mV at 800mA
- Pin-for-Pin Compatible with the LT1317B
- Small 8-Lead MSOP Package and SO Packages
The LT1949 is a fixed frequency step-up DC/DC converter with a 1A, 0.5Ω internal switch. Capable of generating 10V at 175mA from a 3.3V input, the LT1949 is ideal for generating bias voltages for large screen LCD panels. Constant frequency 600kHz operation results in a low noise output that is easy to filter and the 30V switch rating allows output voltage up to 28V using a single inductor. An external compensation pin gives the user flexibility in optimizing loop compensation, allowing small low ESR ceramic capacitors to be used at the output. The 8-lead MSOP and SO packages ensure a low profile overall solution.
The LT1949 includes a low-battery detector that stays alive when the device goes into shutdown. Quiescent current in shutdown is 25µA, while operating current is 4.5mA.
Applications
- LCD Bias Supplies
- GPS Receivers
- Battery Backup
- Portable Electronic Equipment
- Diagnostic Medical Instrumentation
Documentation
Data Sheet 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 |
|---|---|---|---|
| LT1949EMS8#PBF | 8-Lead MSOP | ||
| LT1949EMS8#TRPBF | 8-Lead MSOP | ||
| LT1949ES8#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1949ES8#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1949IS8#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1949IS8#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2) |
||
| LT1949EMS8#PBF | PRODUCTION | |
| LT1949EMS8#TRPBF | PRODUCTION | |
|
Feb 3, 2020 - 20_0128 Laser Top Mark for 8 Lead MSOP Packages Assembled in ADPG and UTAC |
||
| LT1949EMS8#PBF | PRODUCTION | |
| LT1949EMS8#TRPBF | PRODUCTION | |
|
Oct 24, 2024 - 24_0246 Migrating Bottom Trace Code Marking to Top Side Laser Marking for SOIC_N Package |
||
| LT1949ES8#PBF | PRODUCTION | |
| LT1949ES8#TRPBF | PRODUCTION | |
| LT1949IS8#PBF | PRODUCTION | |
| LT1949IS8#TRPBF | PRODUCTION | |
|
Oct 12, 2022 - 22_0255 Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2) |
||
| LT1949ES8#PBF | PRODUCTION | |
| LT1949ES8#TRPBF | PRODUCTION | |
| LT1949IS8#PBF | PRODUCTION | |
| LT1949IS8#TRPBF | PRODUCTION | |
|
Jun 16, 2021 - 21_0026 Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM |
||
| LT1949ES8#PBF | PRODUCTION | |
| LT1949ES8#TRPBF | PRODUCTION | |
| LT1949IS8#PBF | PRODUCTION | |
| LT1949IS8#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:
- LT1949
- LT1949-1
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.
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