5A/12V Step-Down DC-DC Converter with Integrated HS Switch and External LS Switch Using the MAX17506
| Input Type | VIN (MIN) (V) |
VIN (MAX) (V) |
IOUT (A) |
Single/Multiple Output |
VOUT (V) |
POUT (W) |
Topology |
|---|---|---|---|---|---|---|---|
| DC | 19 | 40 |
0.3 | Single | 24 | 7.2 | Flyback |
The MAX17506 is a high-efficiency switching regulator that delivers up to 5A load current at output voltages from 0.9V to (0.9 x VIN). The device integrates the highside MOSFET and operates over 4.5V to 60V, making it ideal for on-board point-of load and post-regulation applications.
The device features a peak current-mode control architecture. Built-in compensation across the output voltage range eliminates the need for external compensation components. The feedback regulation accuracy over -40°C to +125°C is ±1.4%.
Output overload hiccup protection and cycle-by-cycle peak-current limit provide for ultra-safe operation in short-circuit conditions.
Key Features
- No Schottky-Synchronous Operation
- Internal Compensation for Any Output Voltage
- Built-In Soft-Start
- 100kHz to 2.2MHz Adjustable Switching Frequency
- 3.5μA Shutdown Current
- Hiccup or Latchoff Mode Overload Protection
- Programmable EN/UVLO Threshold
- Overtemperature Protection/li>
In this document a step-down DC-DC converter using the MAX17506 is demonstrated for a 12V output application. The power supply delivers up to 5A at 12V.
Designed, Built, Tested
This document describes the hardware shown in Figure 1. It provides a detailed systematic technical guide to designing a step-down (buck) DC-DC converter using Maxim’s MAX17506 current-mode controller. The power supply has been built and tested, details of which follow later in this document.