SNVS118F december 1999 – may 2023 LM2594 , LM2594HV
PRODUCTION DATA
- 1
- 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
- 10Device and Documentation Support
- 11Mechanical, Packaging, and Orderable Information
9.1.3 Catch Diode
Buck regulators require a diode to provide a return path for the inductor current when the switch turns off. This must be a fast diode and must be located close to the LM2594 using short leads and short printed-circuit traces.
Because of their very fast switching speed and low forward voltage drop, Schottky diodes provide the best performance, especially in low output voltage applications (5 V and lower). Ultra-fast recovery, or high-efficiency rectifiers are also a good choice, but some types with an abrupt turnoff characteristic can cause instability or EMI problems. Ultra-fast recovery diodes typically have reverse recovery times of 50 ns or less. Rectifiers such as the 1N4001 series are much too slow and must not be used.
Figure 9-3 Capacitor ESR Change versus Temperature| VR | 1-A DIODES | |||
|---|---|---|---|---|
| SURFACE MOUNT | THROUGH HOLE | |||
| SCHOTTKY | ULTRA FAST RECOVERY | SCHOTTKY | ULTRA FAST RECOVERY | |
| 20 V | All of these diodes are rated to at least 60 V. | 1N5817 | All of these diodes are rated to at least 60 V. | |
| SR102 | ||||
| MBRS130 | 1N5818 | |||
| 30 V | SR103 | |||
| 11DQ03 | ||||
| MBRS140 | MURS120 | 1N5819 | MUR120 | |
| 40 V | 10BQ040 | 10BF10 | SR104 | HER101 |
| 10MQ040 | 11DQ04 | 11DF1 | ||
| 50 V or more | MBRS160 | SR105 | ||
| 10BQ050 | MBR150 | |||
| 10MQ060 | 11DQ05 | |||
| MBRS1100 | MBR160 | |||
| 10MQ090 | SB160 | |||
| SGL41-60 | 11DQ10 | |||
| SS16 | ||||