SNVS124F November   1999  – April 2021

PRODUCTION DATA

1. Features
2. Applications
3. Description
4. Revision History
5. Description (continued)
6. Pin Configuration and Functions
7. Specifications
8. Detailed Description
1. 8.1 Overview
2. 8.2 Functional Block Diagram
3. 8.3 Feature Description
4. 8.4 Device Functional Modes
9. Application and Implementation
1. 9.1 Application Information
2. 9.2 Typical Applications
1. 9.2.1 LM2596 Fixed Output Series Buck Regulator
2. 9.2.2 LM2596 Adjustable Output Series Buck Regulator
10. 10Power Supply Recommendations
11. 11Layout
12. 12Device and Documentation Support
13. 13Mechanical, Packaging, and Orderable Information

#### Package Options

Refer to the PDF data sheet for device specific package drawings

• NDH|5
• NEB|5
• KTT|5
• KTT|5
##### 9.2.2.2.2 Inductor Selection (L1)
1. Calculate the inductor Volt • microsecond constant E × T (V × μs), with Equation 4:
Equation 4.

where

• VSAT = internal switch saturation voltage = 1.16 V
• VD = diode forward voltage drop = 0.5 V

Calculate the inductor Volt • microsecond constant

(E × T),

Equation 5.
2. Use the E × T value from the previous formula and match it with the E × T number on the vertical axis of the Inductor Value Selection Guide shown in Figure 9-8.

E × T = 34.2 (V × μs)

3. On the horizontal axis, select the maximum load current.

ILOAD(max) = 3 A

4. Identify the inductance region intersected by the E × T value and the maximum load current value. Each region is identified by an inductance value and an inductor code (LXX). From the inductor value selection guide shown in Figure 9-8, the inductance region intersected by the 34 (V • μs) horizontal line and the 3-A vertical line is 47 μH, and the inductor code is L39.
5. Select an appropriate inductor from the manufacturers' part numbers listed in Table 9-1. From the table in Table 9-1, locate line L39, and select an inductor part number from the list of manufacturers part numbers.