LTC1157
LTC1157
PRODUCTION3.3V Dual Micropower High-Side/Low-Side MOSFET Driver
- Part Models
- 3
- 1ku List Price
- Starting From $4.58
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Overview
- Allows Lowest Drop 3.3V Supply Switching
- Operates on 3.3V or 5V Nominal Supplies
- 3 Microamps Standby Current
- 80 Microamps ON Current
- Drives Low Cost N-Channel Power MOSFETs
- No External Charge Pump Components
- Controlled Switching ON and OFF Times
- Compatible with 3.3V and 5V Logic Families
- Available in 8-Pin SOIC
The LTC1157 dual 3.3V micropower MOSFET gate driver makes it possible to switch either supply or ground reference loads through a low RDS(ON) Nchannel switch (N-channel switches are required at 3.3V because P-channel MOSFETS do not have guaranteed RDS(ON) with VGS ≤ 3.3V). The LTC1157 internal charge pump boosts the gate drive voltage 5.4V above the positive rail (8.7V above ground), fully enhancing a logic level N-channel switch for 3.3V high-side applications and a standard N-channel switch for 3.3V low-side applications.
The gate drive voltage at 5V is typically 8.8V above supply (13.8V above ground), so standard N-channel MOSFET switches can be used for both high-side and low-side applications. Micropower operation, with 3µA standby current and 80µA operating current, makes the LTC1157 well suited for battery-powered applications.
The LTC1157 is available in both 8-pin DIP and SOIC.
Applications
- Notebook Computer Power Management
- Palmtop Computer Power Management
- P-Channel Switch Replacement
- Battery Charging and Management
- Mixed 5V and 3.3V Supply Switching
- Stepper Motor and DC Motor Control
- Cellular Telephones and Beepers
Documentation
Data Sheet 1
Application Note 3
Design Note 2
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 |
|---|---|---|---|
| LTC1157CN8#PBF | 8-Lead PDIP (Narrow 0.3 Inch) | ||
| LTC1157CS8#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC1157CS8#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 |
||
| LTC1157CN8#PBF | PRODUCTION | |
|
Oct 11, 2022 - 22_0241 Epoxy Change from Henkel 8290 to 8290A for PDIP Package |
||
| LTC1157CN8#PBF | PRODUCTION | |
|
Aug 6, 2022 - 22_0172 Laser Top Mark Conversion for PDIP Packages Assembled in ADPG [PNG] |
||
| LTC1157CN8#PBF | PRODUCTION | |
|
Dec 14, 2023 - 22_0255 Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2) |
||
| LTC1157CS8#PBF | PRODUCTION | |
| LTC1157CS8#TRPBF | PRODUCTION | |
|
Jun 16, 2021 - 21_0026 Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM |
||
| LTC1157CS8#PBF | PRODUCTION | |
| LTC1157CS8#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:
- LTC1157
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.