LT1578
PRODUCTION1.5A, 200kHz Step-Down Switching Regulator
- Part Models
- 8
- 1ku List Price
- Starting From $5.04
Overview
- 1.5A Switch Current
- High Efficiency—Low Loss 0.2Ω Switch
- Constant 200kHz Switching Frequency
- 4V to 15V Input Voltage Range
- Minimum Output: 1.21V
- Low Supply Current: 1.9mA
- Low Shutdown Current: 20µA
- Easily Synchronizable Up to 400kHz
- Cycle-by-Cycle Current Limit
- Reduced EMI Generation
- Low Thermal Resistance SO-8 Package
- Uses Small Low Value Inductors
The LT1578 is a 200kHz monolithic buck mode switching regulator. A 1.5A switch is included on the die along with all the necessary oscillator, control and logic circuitry. The topology is current mode for fast transient response and good loop stability. The LT1578 is a modified version of the LT1507 that has been optimized for noise sensitive applications. It will operate over a 4V to 15V input range.
In addition, the reference voltage has been lowered to allow the device to produce output voltages down to 1.2V. Quiescent current has been reduced by a factor of two. Switch on resistance has been reduced by 30%. Switch transition times have been slowed to reduce EMI generation. The oscillator frequency has been reduced to 200kHz to maintain high efficiency over a wide output current range.
The pinout has been changed to improve PC layout by allowing the high current, high frequency switching circuitry to be easily isolated from low current, noise sensitive control circuitry. The new SO-8 package includes a fused ground lead that significantly reduces the thermal resistance of the device to extend the ambient operating temperature range. Standard surface mount external parts can be used including the inductor and capacitors.
Applications
- Portable Computers
- Battery-Powered Systems
- Battery Charger
- Distributed Power Systems
Documentation
Data Sheet 1
User Guide 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 |
|---|---|---|---|
| LT1578CS8#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1578CS8#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1578CS8-2.5#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1578CS8-2.5#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1578IS8#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1578IS8#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1578IS8-2.5#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1578IS8-2.5#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Oct 8, 2024 - 24_0236 Migrating Bottom Trace Code Marking to Top Side Laser Marking for SOIC_N Package |
||
| LT1578CS8#PBF | PRODUCTION | |
| LT1578CS8#TRPBF | PRODUCTION | |
| LT1578CS8-2.5#PBF | PRODUCTION | |
| LT1578CS8-2.5#TRPBF | PRODUCTION | |
| LT1578IS8#PBF | PRODUCTION | |
| LT1578IS8#TRPBF | PRODUCTION | |
| LT1578IS8-2.5#PBF | PRODUCTION | |
| LT1578IS8-2.5#TRPBF | PRODUCTION | |
|
Oct 12, 2022 - 22_0254 Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 1 of 2) |
||
| LT1578CS8#PBF | PRODUCTION | |
| LT1578CS8#TRPBF | PRODUCTION | |
| LT1578CS8-2.5#PBF | PRODUCTION | |
| LT1578CS8-2.5#TRPBF | PRODUCTION | |
| LT1578IS8#PBF | PRODUCTION | |
| LT1578IS8#TRPBF | PRODUCTION | |
| LT1578IS8-2.5#PBF | PRODUCTION | |
| LT1578IS8-2.5#TRPBF | PRODUCTION | |
|
Jun 11, 2021 - 21_0060 Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM |
||
| LT1578CS8#PBF | PRODUCTION | |
| LT1578CS8#TRPBF | PRODUCTION | |
| LT1578CS8-2.5#PBF | PRODUCTION | |
| LT1578CS8-2.5#TRPBF | PRODUCTION | |
| LT1578IS8#PBF | PRODUCTION | |
| LT1578IS8#TRPBF | PRODUCTION | |
| LT1578IS8-2.5#PBF | PRODUCTION | |
| LT1578IS8-2.5#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:
- LT1578
- LT1578-2.5
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.
Evaluation Kits
LT1578CS8 | 1.5A 200KHz Buck DC/DC with Shutdown & Sync, 5-15VIN, Jumper Selectable 3.3VOUT or 5VOUT @1.25A
Resources
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