SNAS879 December 2024 LMR60420
PRODMIX
- 1
- 1 Features
- 2 Applications
- 3 Description
- 4 Device Comparison Table
- 5 Pin Configuration and Functions
- 6 Specifications
- 7 Detailed Description
-
8 Application and
Implementation
- 8.1 Application Information
- 8.2
Typical Application
- 8.2.1 Design Requirements
- 8.2.2 Detailed Design Procedure
- 8.2.3 Application Curves
- 8.3 Power Supply Recommendations
- 8.4 Layout
- 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 LMR60420. This device is designed to function over a wide range of external components and system parameters. As a quick-start guide, Table 8-1 provides typical component values for a range of the most common operating conditions.
Note: The fourth option for the MODE/SYNC pin is to connect this pin
directly to RT. In this configuration, the device operates in FPWM by default. See Section 7.3.4 for details.
Figure 8-1 LMR60420 Reference SchematicTable 8-1 Recommended Passive Components
| FSW (kHz) | VOUT (V) | IOUT (A) | L (μH) | COUT(1) | RFBT (kΩ) | RFBB (kΩ) | CIN (μF) | CBOOT (nF) | RT (kΩ) |
|---|---|---|---|---|---|---|---|---|---|
| 400 | 3.3 | 2 | 10 | 33 | SHUNT | DNP | 4.7 | 100 | 86.6 |
| 400 | 5 | 2 | 10 | 33 | SHUNT | DNP | 4.7 | 100 | 86.6 |
| 1000 | 3.3 | 2 | 4.7 | 22 | SHUNT | DNP | 4.7 | 100 | 34 |
| 1000 | 5 | 2 | 4.7 | 22 | SHUNT | DNP | 4.7 | 100 | 34 |
| 2000 | 3.3 | 2 | 2.2 | 15 | SHUNT | DNP | 4.7 | 100 | 16.5 |
| 2000 | 5 | 2 | 2.2 | 15 | SHUNT | DNP | 4.7 | 100 | 16.5 |
(1) Rated
capacitance