LT1521
LT1521
PRODUCTION300mA Low Dropout Regulators with Micropower Quiescent Current and Shutdown
- Part Models
- 34
- 1ku List Price
- Starting From $3.05
Viewing:
Overview
- Dropout Voltage: 0.5V
- Output Current: 300mA
- Quiescent Current: 12µA
- No Protection Diodes Needed
- Adjustable Output from 3.8V to 20V
- Fixed Output Voltages: 3V, 3.3V, 5V
- Controlled Quiescent Current in Dropout
- Shutdown IQ = 6µA
- Reverse Battery Protection
- No Reverse Current
- Thermal Limiting
The LT1521/LT1521-3/LT1521-3.3/LT1521-5 are low dropout regulators with micropower quiescent current and shutdown. These devices are capable of supplying 300mA of output current with a dropout voltage of 0.5V.Designed for use in battery-powered systems, the low quiescent current, 12μA operating and 6μA in shutdown, makes them an ideal choice. The quiescent current is well controlled; it does not rise in dropout as it does with many other low dropout PNP regulators.
Other features of the LT1521/LT1521-3/LT1521-3.3/LT1521-5 include the ability to operate with very small output capacitors. They are stable with only 1.5μF on the output while most older devices require between 10μF and 100μF for stability. Small ceramic capacitors can be used, enhancing manufacturability. Also, the input may be connected to voltages lower than the output voltage, including negative voltages, without reverse current flow from output to input. This makes the LT1521 series ideal for backup power situations where the output is held high and the input is low or reversed. Under these conditions only 5μA will flow from the output pin to ground.
APPLICATIONS
- Low Current Regulator
- Regulator for Battery-Powered Systems
- Post Regulator for Switching Supplies
Documentation
Data Sheet 1
Application Note 1
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 Models | Product Lifecycle | PCN |
|---|---|---|
|
Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2) |
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| LT1521CMS8#PBF | PRODUCTION | |
| LT1521CMS8-3#PBF | PRODUCTION | |
| LT1521CMS8-3#TRPBF | PRODUCTION | |
| LT1521CMS8-3.3#PBF | PRODUCTION | |
| LT1521CMS8-3.3#TRPBF | PRODUCTION | |
| LT1521CMS8-5#PBF | PRODUCTION | |
|
Feb 3, 2020 - 20_0128 Laser Top Mark for 8 Lead MSOP Packages Assembled in ADPG and UTAC |
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| LT1521CMS8#PBF | PRODUCTION | |
| LT1521CMS8-3#PBF | PRODUCTION | |
| LT1521CMS8-3#TRPBF | PRODUCTION | |
| LT1521CMS8-3.3#PBF | PRODUCTION | |
| LT1521CMS8-3.3#TRPBF | PRODUCTION | |
| LT1521CMS8-5#PBF | PRODUCTION | |
|
Oct 8, 2024 - 24_0236 Migrating Bottom Trace Code Marking to Top Side Laser Marking for SOIC_N Package |
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| LT1521CS8#PBF | PRODUCTION | |
| LT1521CS8#TRPBF | PRODUCTION | |
| LT1521CS8-3#PBF | PRODUCTION | |
| LT1521CS8-3#TRPBF | PRODUCTION | |
| LT1521CS8-3.3#PBF | PRODUCTION | |
| LT1521CS8-3.3#TRPBF | PRODUCTION | |
| LT1521CS8-5#PBF | PRODUCTION | |
| LT1521CS8-5#TRPBF | PRODUCTION | |
| LT1521IS8#PBF | PRODUCTION | |
| LT1521IS8#TRPBF | PRODUCTION | |
| LT1521IS8-3#PBF | PRODUCTION | |
| LT1521IS8-3#TRPBF | PRODUCTION | |
| LT1521IS8-3.3#PBF | PRODUCTION | |
| LT1521IS8-3.3#TRPBF | PRODUCTION | |
| LT1521IS8-5#PBF | PRODUCTION | |
| LT1521IS8-5#TRPBF | PRODUCTION | |
|
Oct 12, 2022 - 22_0254 Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 1 of 2) |
||
| LT1521CS8#PBF | PRODUCTION | |
| LT1521CS8#TRPBF | PRODUCTION | |
| LT1521CS8-3#PBF | PRODUCTION | |
| LT1521CS8-3#TRPBF | PRODUCTION | |
| LT1521CS8-3.3#PBF | PRODUCTION | |
| LT1521CS8-3.3#TRPBF | PRODUCTION | |
| LT1521CS8-5#PBF | PRODUCTION | |
| LT1521CS8-5#TRPBF | PRODUCTION | |
| LT1521IS8#PBF | PRODUCTION | |
| LT1521IS8#TRPBF | PRODUCTION | |
| LT1521IS8-3#PBF | PRODUCTION | |
| LT1521IS8-3#TRPBF | PRODUCTION | |
| LT1521IS8-3.3#PBF | PRODUCTION | |
| LT1521IS8-3.3#TRPBF | PRODUCTION | |
| LT1521IS8-5#PBF | PRODUCTION | |
| LT1521IS8-5#TRPBF | PRODUCTION | |
|
Jun 11, 2021 - 21_0060 Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM |
||
| LT1521CS8#PBF | PRODUCTION | |
| LT1521CS8#TRPBF | PRODUCTION | |
| LT1521CS8-3#PBF | PRODUCTION | |
| LT1521CS8-3#TRPBF | PRODUCTION | |
| LT1521CS8-3.3#PBF | PRODUCTION | |
| LT1521CS8-3.3#TRPBF | PRODUCTION | |
| LT1521CS8-5#PBF | PRODUCTION | |
| LT1521CS8-5#TRPBF | PRODUCTION | |
| LT1521IS8#PBF | PRODUCTION | |
| LT1521IS8#TRPBF | PRODUCTION | |
| LT1521IS8-3#PBF | PRODUCTION | |
| LT1521IS8-3#TRPBF | PRODUCTION | |
| LT1521IS8-3.3#PBF | PRODUCTION | |
| LT1521IS8-3.3#TRPBF | PRODUCTION | |
| LT1521IS8-5#PBF | PRODUCTION | |
| LT1521IS8-5#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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| Parts | Product Life Cycle | Description |
|---|---|---|
| LT1962 | RECOMMENDED FOR NEW DESIGNS | 300mA, Low Noise, Micropower LDO Regulators |
Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LT1521
- LT1521-3
- LT1521-3.3
- LT1521-5
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.