LT1172
PRODUCTION100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators
- Part Models
- 21
- 1ku List Price
- Starting From $3.99
Overview
- Wide Input Voltage Range: 3V to 60V
- Low Quiescent Current: 6mA
- Internal 5A Switch (2.5A for LT1171, 1.25A for LT1172)
- Shutdown Mode Draws Only 50μA Supply Current
- Very Few External Parts Required
- Self-Protected Against Overloads
- Operates in Nearly All Switching Topologies
- Flyback-Regulated Mode Has Fully Floating Outputs
- Comes in Standard 5-Pin Packages
- LT1172 Available in 8-Pin MiniDIP and Surface Mount Packages
- Can Be Externally Synchronized
The LT1170/LT1171/LT1172 are monolithic high power switching regulators. They can be operated in all standard switching configurations including buck, boost, flyback, forward, inverting and “Cuk.” A high current, high efficiency switch is included on the die along with all oscillator, control and protection circuitry. Integration of all functions allows the LT1170/LT1171/LT1172 to be built in a standard 5-pin TO-3 or TO-220 power package as well as the 8-pin packages (LT1172). This makes them extremely easy to use and provides “bust proof” operation similar to that obtained with 3-pin linear regulators.
The LT1170/LT1171/LT1172 operate with supply voltages from 3V to 60V, and draw only 6mA quiescent current. They can deliver load power up to 100W with no external power devices. By utilizing current-mode switching techniques, they provide excellent AC and DC load and line regulation.
The LT1170/LT1171/LT1172 have many unique features not found even on the vastly more difficult to use low power control chips presently available. They use adaptive antisat switch drive to allow very wide ranging load currents with no loss in efficiency. An externally activated shutdown mode reduces total supply current to 50μA typically for standby operation.
Applications
- Logic Supply 5V at 10A
- 5V Logic to ±15V Op Amp Supply
- Battery Upconverter
- Power Inverter (+ to –) or (– to +)
- Fully Floating Multiple Outputs
User Note
This data sheet is only intended to provide specifications, graphs, and a general functional description of the LT1170/LT1171/LT1172. Application circuits are included to show the capability of the LT1170/LT1171/LT1172. A complete design manual (AN19) should be obtained to assist in developing new designs. This manual contains a comprehensive discussion of both the LT1070 and the external components used with it, as well as complete formulas for calculating the values of these components. The manual can also be used for the LT1170/LT1171/LT1172 by factoring in the higher frequency. A CAD design program called SwitcherCAD® is also available.
Documentation
Data Sheet 1
Application Note 8
Design Note 3
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 |
|---|---|---|---|
| LT1172CN8#PBF | 8-Lead PDIP (Narrow 0.3 Inch) | ||
| LT1172CQ#PBF | 5-Lead DD Pak | ||
| LT1172CQ#TRPBF | 5-Lead DD Pak | ||
| LT1172CS8#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1172CS8#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1172CSW#PBF | 16-Lead SOIC (Wide 0.3 Inch) | ||
| LT1172CSW#TRPBF | 16-Lead SOIC (Wide 0.3 Inch) | ||
| LT1172CT#06PBF | 5-Lead TO-220 (Flow 06) | ||
| LT1172CT#31PBF | 5-Lead TO-220 (Flow 31) | ||
| LT1172CT#PBF | 5-Lead TO-220 | ||
| LT1172HVCQ#PBF | 5-Lead DD Pak | ||
| LT1172HVCQ#TRPBF | 5-Lead DD Pak | ||
| LT1172HVCT#06PBF | 5-Lead TO-220 (Flow 06) | ||
| LT1172HVCT#30PBF | 5-Lead TO-220 (Flow 30) | ||
| LT1172HVCT#31PBF | 5-Lead TO-220 (Flow 31) | ||
| LT1172HVCT#PBF | 5-Lead TO-220 | ||
| LT1172HVIQ#PBF | 5-Lead DD Pak | ||
| LT1172HVIQ#TRPBF | 5-Lead DD Pak | ||
| LT1172IN8#PBF | 8-Lead PDIP (Narrow 0.3 Inch) | ||
| LT1172IS8#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1172IS8#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 |
||
| LT1172CN8#PBF | PRODUCTION | |
| LT1172IN8#PBF | PRODUCTION | |
|
Oct 11, 2022 - 22_0241 Epoxy Change from Henkel 8290 to 8290A for PDIP Package |
||
| LT1172CN8#PBF | PRODUCTION | |
| LT1172IN8#PBF | PRODUCTION | |
|
Aug 6, 2022 - 22_0172 Laser Top Mark Conversion for PDIP Packages Assembled in ADPG [PNG] |
||
| LT1172CN8#PBF | PRODUCTION | |
| LT1172IN8#PBF | PRODUCTION | |
|
Aug 10, 2022 - 22_0175 Laser Top Mark Conversion for DDPAK & TO220 Packages Assembled in ADPG. Country of Origin Code [MY] To Be Incorporated On Top Mark |
||
| LT1172CQ#PBF | PRODUCTION | |
| LT1172CQ#TRPBF | PRODUCTION | |
| LT1172CT#06PBF | PRODUCTION | |
| LT1172CT#31PBF | PRODUCTION | |
| LT1172CT#PBF | PRODUCTION | |
| LT1172HVCQ#PBF | PRODUCTION | |
| LT1172HVCQ#TRPBF | PRODUCTION | |
| LT1172HVCT#06PBF | PRODUCTION | |
| LT1172HVCT#30PBF | PRODUCTION | |
| LT1172HVCT#31PBF | PRODUCTION | |
| LT1172HVCT#PBF | PRODUCTION | |
| LT1172HVIQ#PBF | PRODUCTION | |
| LT1172HVIQ#TRPBF | PRODUCTION | |
|
Nov 14, 2022 - 22_0254 Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 1 of 2) |
||
| LT1172CS8#PBF | PRODUCTION | |
| LT1172CS8#TRPBF | PRODUCTION | |
|
Jun 11, 2021 - 21_0060 Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM |
||
| LT1172CS8#PBF | PRODUCTION | |
| LT1172CS8#TRPBF | PRODUCTION | |
| LT1172IS8#PBF | PRODUCTION | |
| LT1172IS8#TRPBF | PRODUCTION | |
|
Aug 10, 2022 - 22_0176 Laser Top Mark Conversion for SOIC_W Packages Assembled in ADPG [PNG] and UTL |
||
| LT1172CSW#PBF | PRODUCTION | |
| LT1172CSW#TRPBF | PRODUCTION | |
|
Dec 14, 2023 - 22_0255 Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2) |
||
| LT1172IS8#PBF | PRODUCTION | |
| LT1172IS8#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Tools & Simulations
LTspice 2
- LT1172HV Demo Circuit - 100kHz, 1.25A High Efficiency Switching Regulator (5V to 12V @ 300mA)
- LT1172 Demo Circuit - 100kHz, 1.25A High Efficiency Switching Regulators (5V to 12V @ 250mA)
Models for the following parts are available in LTspice:
- LT1172
- LT1172HV
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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