48V Input, 400 mA Output, 2.2 MHz Switching Frequency, Integrated Switch Step-Down Regulator

1 Typical Application

2 Product Family

3 Block Diagram

4 Pin Configuration

4.2 Pin Description

5 Functional Description

5.1 Theory of Operation

5.2 Pulse-Width Modulation

5.3 Pulse Frequency Mode of Operation (PFM)

5.4 Internal Reference Voltage V_REF

5.5 Internal Compensation

5.6 Enable Input

5.8 Undervoltage Lockout

5.9 Overtemperature Protection

5.10 High-Side Drive and Bootstrap

5.11 Integrated Bootstrap Diode

5.12 Frequency Dithering

5.13 Power Good

5.14 Overcurrent Protection

5.15 Overvoltage Protection

6 Electrical Characteristics

6.1 Absolute Maximum Ratings

6.2 DC Characteristics

6.3 Temperature Specifications

7 Typical Performance Curves

8 Application Information

8.1 Adjustable Output Voltage Calculations

8.2 Inductor Selection and Slope Compensation

8.3 Freewheeling Diode

8.4 Input Capacitor Selection

8.5 Output Capacitor Selection

8.6 Bootstrap Charging and Maximum Duty Cycle Limitations

8.7 Input Voltage Limitations

8.8 Light Load Efficiency Guidelines

8.9 PCB Layout Information

9 Typical Application Circuits

10 Packaging Information

11 Revision History

12 Product Identification System

13 Product Change Notification Service

Microchip Information

Microchip Devices Code Protection Feature

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