SNVSCH7 February 2024 LMR38025
PRODUCTION DATA
- 1
- 1 Features
- 2 Applications
- 3 Description
- 4 Device Comparison Table
- 5 Pin Configuration and Functions
- 6 Specifications
-
7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3
Feature Description
- 7.3.1 Fixed Frequency Peak Current Mode Control
- 7.3.2 Adjustable Output Voltage
- 7.3.3 Enable
- 7.3.4 Switching Frequency and Synchronization (RT/SYNC)
- 7.3.5 Power-Good Flag Output
- 7.3.6 Minimum On Time, Minimum Off Time, and Frequency Foldback
- 7.3.7 Bootstrap Voltage
- 7.3.8 Overcurrent and Short-Circuit Protection
- 7.3.9 Soft Start
- 7.3.10 Thermal Shutdown
- 7.4 Device Functional Modes
- 8 Application and Implementation
- 9 Device and Documentation Support
- 10Revision History
- 11Mechanical, Packaging, and Orderable Information
8.2 Typical Application
Figure 8-1 shows a typical application circuit for the LMR38025. This device is designed to function over a wide range of external components and system parameters. However, the internal compensation is designed for a certain range of external inductance and output capacitance. As a quick-start guide,Table 8-1 provides typical component values for a range of the most common output voltages.
Figure 8-1 Example Application CircuitTable 8-1 Typical External Component Values for 2.5A
Output Current
| ƒSW (kHz) |
VIN (V) Typical |
VOUT (V) | L (µH) | NOMINAL COUT (RATED CAPACITANCE) | MINIMUM COUT (RATED CAPACITANCE) | RFBT (Ω) | RFBB (Ω) |
|---|---|---|---|---|---|---|---|
| 300 |
48 |
5 |
15 |
3 × 22µF |
3 × 15µF | 100k | 24.9k |
| 400 |
48 |
3.3 |
10 |
4 × 47µF |
3 × 47µF | 100k | 43.2k |
|
400 |
12 |
5 |
6.8 |
3 × 22µF | 3 × 15µF | 100k | 24.9k |
|
1100 |
48 |
12 |
10 |
2 × 10µF | 2 × 4.7µF | 100k | 9.09k |
| 1100 |
48 |
24 |
33 |
3 × 4.7µF | 1 × 10µF | 100k | 4.32k |
|
2200 |
24 |
5 |
4.7 |
2 × 22µF | 3 × 10µF | 100k | 24.9k |