LT1579
LT1579
PRODUCTION300mA Dual Input Smart Battery Backup Regulator
- Part Models
- 32
- 1ku List Price
- Starting From $6.21
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Overview
- Maintains Output Regulation with Dual Inputs
- Dropout Voltage: 0.4V
- Output Current: 300mA
- 50µA Quiescent Current
- No Protection Diodes Needed
- Two Low-Battery Comparators
- Status Flags Aid Power Management
- Adjustable Output from 1.5V to 20V
- Fixed Output Voltages: 3V, 3.3V and 5V
- 7µA Quiescent Current in Shutdown
- Reverse-Battery Protection
- Reverse Current Protection
- Remove, Recharge and Replace Batteries Without Loss of Regulation
The LT1579 is a dual input, single output, low dropout regulator. This device is designed to provide an uninterruptible output voltage from two independent input voltage sources on a priority basis. All of the circuitry needed to switch smoothly and automatically between inputs is incorporated.
The LT1579 can supply 300mA of output current from either input at a dropout voltage of 0.4V. Quiescent current is 50µA, dropping to 7µA in shutdown. Two comparators are included to monitor input voltage status. Two additional status flags indicate which input is supplying power and provide an early warning against loss of output regulation when both inputs are low. A secondary select pin is provided so that the user can force the device to switch from the primary input to the secondary input. Internal protection circuitry includes reverse-battery protection, current limiting, thermal limiting and reverse-current protection.
The device is available in fixed output voltages of 3V, 3.3V and 5V, and as an adjustable device with a 1.5V reference voltage. The LT1579 regulators are available in narrow 16-lead SO and 16-lead SSOP packages with all features, and in SO-8 with limited features.
Applications
- Dual Battery Systems
- Battery Backup Systems
- Automatic Power Management for Battery-Operated Systems
Documentation
Data Sheet 1
Application Note 1
Design Note 3
Spec Notice 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 Models | Product Lifecycle | PCN |
|---|---|---|
|
Oct 3, 2024 - 24_0235 (QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking |
||
| LT1579CGN#PBF | PRODUCTION | |
| LT1579CGN#TRPBF | PRODUCTION | |
| LT1579CGN-3.3#PBF | PRODUCTION | |
| LT1579CGN-3.3#TRPBF | PRODUCTION | |
| LT1579CGN-5#PBF | PRODUCTION | |
| LT1579CGN-5#TRPBF | PRODUCTION | |
| LT1579IGN#PBF | PRODUCTION | |
| LT1579IGN#TRPBF | PRODUCTION | |
| LT1579IGN-3.3#PBF | PRODUCTION | |
| LT1579IGN-3.3#TRPBF | PRODUCTION | |
| LT1579IGN-5#PBF | PRODUCTION | |
| LT1579IGN-5#TRPBF | PRODUCTION | |
|
Oct 11, 2022 - 22_0235 Epoxy Change from Henkel 8290 to 8290A for GN Package |
||
| LT1579CGN#PBF | PRODUCTION | |
| LT1579CGN#TRPBF | PRODUCTION | |
| LT1579CGN-3.3#PBF | PRODUCTION | |
| LT1579CGN-3.3#TRPBF | PRODUCTION | |
| LT1579CGN-5#PBF | PRODUCTION | |
| LT1579CGN-5#TRPBF | PRODUCTION | |
| LT1579IGN#PBF | PRODUCTION | |
| LT1579IGN#TRPBF | PRODUCTION | |
| LT1579IGN-3.3#PBF | PRODUCTION | |
| LT1579IGN-3.3#TRPBF | PRODUCTION | |
| LT1579IGN-5#PBF | PRODUCTION | |
| LT1579IGN-5#TRPBF | PRODUCTION | |
|
Apr 6, 2022 - 22_0066 Laser Top Mark for 16QSOP Assembled in ADPG [PNG] |
||
| LT1579CGN#PBF | PRODUCTION | |
| LT1579CGN#TRPBF | PRODUCTION | |
| LT1579CGN-3.3#PBF | PRODUCTION | |
| LT1579CGN-3.3#TRPBF | PRODUCTION | |
| LT1579CGN-5#PBF | PRODUCTION | |
| LT1579CGN-5#TRPBF | PRODUCTION | |
| LT1579IGN#PBF | PRODUCTION | |
| LT1579IGN#TRPBF | PRODUCTION | |
| LT1579IGN-3.3#PBF | PRODUCTION | |
| LT1579IGN-3.3#TRPBF | PRODUCTION | |
| LT1579IGN-5#PBF | PRODUCTION | |
| LT1579IGN-5#TRPBF | PRODUCTION | |
|
Oct 8, 2024 - 24_0236 Migrating Bottom Trace Code Marking to Top Side Laser Marking for SOIC_N Package |
||
| LT1579CS#PBF | PRODUCTION | |
| LT1579CS#TRPBF | PRODUCTION | |
| LT1579CS-3#PBF | PRODUCTION | |
| LT1579CS-3#TRPBF | PRODUCTION | |
| LT1579CS-3.3#PBF | PRODUCTION | |
| LT1579CS-3.3#TRPBF | PRODUCTION | |
| LT1579CS-5#PBF | PRODUCTION | |
| LT1579CS-5#TRPBF | PRODUCTION | |
| LT1579CS8#PBF | PRODUCTION | |
| LT1579CS8#TRPBF | PRODUCTION | |
| LT1579CS8-3#PBF | PRODUCTION | |
| LT1579CS8-3#TRPBF | PRODUCTION | |
| LT1579CS8-3.3#PBF | PRODUCTION | |
| LT1579CS8-3.3#TRPBF | PRODUCTION | |
| LT1579CS8-5#PBF | PRODUCTION | |
| LT1579CS8-5#TRPBF | PRODUCTION | |
|
Oct 12, 2022 - 22_0252 Epoxy Change from Henkel 8290 to 8290A for 16-Lead SOIC Package |
||
| LT1579CS#PBF | PRODUCTION | |
| LT1579CS#TRPBF | PRODUCTION | |
| LT1579CS-3#PBF | PRODUCTION | |
| LT1579CS-3#TRPBF | PRODUCTION | |
| LT1579CS-3.3#PBF | PRODUCTION | |
| LT1579CS-3.3#TRPBF | PRODUCTION | |
| LT1579CS-5#PBF | PRODUCTION | |
| LT1579CS-5#TRPBF | PRODUCTION | |
|
Aug 6, 2022 - 22_0173 Laser Top Mark Conversion for SOICN14 and SOICN16 Packages Assembled on ADPG [PNG] |
||
| LT1579CS#PBF | PRODUCTION | |
| LT1579CS#TRPBF | PRODUCTION | |
| LT1579CS-3#PBF | PRODUCTION | |
| LT1579CS-3#TRPBF | PRODUCTION | |
| LT1579CS-3.3#PBF | PRODUCTION | |
| LT1579CS-3.3#TRPBF | PRODUCTION | |
| LT1579CS-5#PBF | PRODUCTION | |
| LT1579CS-5#TRPBF | PRODUCTION | |
|
Oct 12, 2022 - 22_0254 Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 1 of 2) |
||
| LT1579CS8#PBF | PRODUCTION | |
| LT1579CS8#TRPBF | PRODUCTION | |
| LT1579CS8-3#PBF | PRODUCTION | |
| LT1579CS8-3#TRPBF | PRODUCTION | |
| LT1579CS8-3.3#PBF | PRODUCTION | |
| LT1579CS8-3.3#TRPBF | PRODUCTION | |
| LT1579CS8-5#PBF | PRODUCTION | |
| LT1579CS8-5#TRPBF | PRODUCTION | |
|
Jun 11, 2021 - 21_0060 Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM |
||
| LT1579CS8#PBF | PRODUCTION | |
| LT1579CS8#TRPBF | PRODUCTION | |
| LT1579CS8-3#PBF | PRODUCTION | |
| LT1579CS8-3#TRPBF | PRODUCTION | |
| LT1579CS8-3.3#PBF | PRODUCTION | |
| LT1579CS8-3.3#TRPBF | PRODUCTION | |
| LT1579CS8-5#PBF | PRODUCTION | |
| LT1579CS8-5#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
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