SNVS119D March 1998 – May 2016 LM2597 , LM2597HV
PRODUCTION DATA.
- 1 Features
- 2 Applications
- 3 Description
- 4 Revision History
- 5 Description (continued)
- 6 Pin Configuration and Functions
-
7 Specifications
- 7.1 Absolute Maximum Ratings
- 7.2 ESD Ratings
- 7.3 Recommended Operating Conditions
- 7.4 Thermal Information
- 7.5 Electrical Characteristics - 3.3 V
- 7.6 Electrical Characteristics - 5 V
- 7.7 Electrical Characteristics - 12 V
- 7.8 Electrical Characteristics - Adjustable
- 7.9 Electrical Characteristics - All Output Voltage Versions
- 7.10 Typical Characteristics
- 8 Detailed Description
- 9 Application and Implementation
- 10Power Supply Recommendations
- 11Layout
- 12Device and Documentation Support
- 13Mechanical, Packaging, and Orderable Information
1 Features
- 3.3-V, 5-V, 12-V, and Adjustable Output Versions
- Adjustable Version Output Voltage Range: 1.2 V to 37 V (57 V for HV Version) ±4% Maximum Over Line and Load Conditions
- Specified 0.5-A Output Current
- Available in 8-Pin Surface-Mount and 8-Pin PDIP Packages
- Input Voltage Range Up to 60 V
- 150-kHz Fixed-Frequency Internal Oscillator
- Shutdown/Soft-Start
- Out of Regulation Error Flag
- Error Output Delay
- Bias Supply Pin (VBS) for Internal Circuitry Improves Efficiency at High Input Voltages
- Low Power Standby Mode, IQ, Typically 85 μA
- High Efficiency
- Uses Readily Available Standard Inductors
- Thermal Shutdown and Current-Limit Protection
2 Applications
- Simple High-Efficiency Step-Down (Buck) Regulator
- Efficient Preregulator for Linear Regulators
- On-Card Switching Regulators
- Positive-to-Negative Converter
3 Description
The LM2597xx series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 0.5-A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, and an adjustable output version, and are packaged in an 8-pin PDIP and an 8-pin surface-mount package.
This series of switching regulators is similar to the LM2594 series, with additional supervisory and performance features added.
Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation, improved line and load specifications, fixed-frequency oscillator, Shutdown/Soft-start, error flag delay, and error flag output.
The LM2597xx series operates at a switching frequency of 150-kHz, thus allowing smaller-sized filter components than what would be required with lower-frequency switching regulators. Because of its high efficiency, the copper traces on the printed-circuit board are normally the only heat sinking required.
Device Information(1)
| PART NUMBER | PACKAGE | BODY SIZE (NOM) |
|---|---|---|
| LM2597, LM2597HV | SOIC (8) | 4.90 mm × 3.91 mm |
| PDIP (8) | 9.81 mm × 6.35 mm |
- For all available packages, see the orderable addendum at the end of the data sheet.
Typical Application
