MAX38640A
Maxim Integrated
Troubleshooting the MAX38640A (1.8V Output) SMPS Circuit
Application NoteAnalog
Troubleshooting the MAX38640A (1.8V Output) SMPS Circuit
A step-by-step troubleshooting guide for the MAX38640A 1.8V SMPS circuit, detailing input/output voltage checks, inductor waveform analysis, and RSEL resistor verification.
Overview
This document provides a comprehensive troubleshooting procedure for the MAX38640A nanoPower buck converter configured for a 1.8V output. It outlines four primary diagnostic steps: measuring input voltage (2.8V to 4.2V range), analyzing the inductor (LX) signal waveform under varying loads, verifying the DC output voltage, and measuring AC output ripple. The guide includes detailed diagnostic tables to resolve common issues such as incorrect RSEL values (768kΩ required for 1.8V), battery defects, PCB opens/shorts, and inductor saturation.
Use Cases
- Diagnosing faults in MAX38640A-based power circuits
- Verifying switched-mode power supply inductor waveforms
- Setting output voltage using RSEL resistors for Maxim nanoPower buck converters
- Measuring AC ripple and DC accuracy on low-voltage regulators
- Debugging battery-powered buck converter circuits
Topics
MAX38640A
buck converter
SMPS
troubleshooting
1.8V output
nanoPower
LX waveform
RSEL resistor
output ripple
Analog Devices
Maxim Integrated
Referenced Parts
| MAX38640A | Maxim Integrated | Troubleshooting the MAX38640A (1.8V Output) SMPS Circuit |