MAXM38643

RECOMMENDED FOR NEW DESIGNS

Tiny, 1.8V to 5.5V Input, 330nA IQ, 600mA nanoPower Buck Module

NanoPower Buck Module with Industry’s Lowest IQ Extends Battery Life for Always-On Devices

Data Sheet (Rev. 0)
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Overview

  • Extends Battery Life
    • 330nA Ultra-Low Quiescent Supply Current
    • 1nA Shutdown Current
    • 96% Peak Efficiency and over 88% at 10μA
  • Easy to Use – Addresses Popular Operations
    • 1.8V to 5.5V Input Range
    • Single Resistor-Adjustable VOUT from 0.7V to 3.3V
    • Factory-Preprogrammed VOUT from 0.5V to 5V
    • ±1.75% Output Voltage Accuracy
    • Up to 600mA Load Current Capability
  • Protects System in Multiple Use Cases
    • Reverse-Current Blocking in Shutdown
    • Active Discharge Feature
  • Reduces Size and Increases Reliability
    • -40°C to +85°C Temperature Range
    • 2.1mm x 2.6mm, 10-Lead eMGA Package

The MAXM38643 is an ultra-low-IQ (330nA) buck module that steps down input voltages in the range of 1.8V to 5.5V to a wide range of output voltages between 0.7V to 3.3V (using a single resistor at the RSEL pin). The output voltage is programmable upon startup using a single external resistor from the RSEL pin to GND. Factory-preprogrammed fixed output voltage versions from 0.5V to 5V are also available that do not use the RSEL pin to set the output voltage. In this case, the RSEL pin in the module is left floating.

The module offers robust performance features. To optimize efficiency and transient response across the load operation range, the module automatically switches between ultra-low-power mode (ULPM), low-power mode (LPM), and highpower mode (HPM) to better service the load, depending on the load current. The device overregulates in ULPM to improve efficiency and allow the output capacitor to handle the transient load currents. The device has 90% duty cycle limitation. An active discharge resistor pulls OUT to ground when the part is in shutdown.

Applications

  • Bluetooth® LE Devices
  • Hearables
  • Portable Space-Constrained Products
  • Single Li+ and Coin Cell Battery Products
  • Ultra-Low-Power IoT, NB IoT
  • Wearables
  • Wired, Wireless Products
MAXM38643
Tiny, 1.8V to 5.5V Input, 330nA IQ, 600mA nanoPower Buck Module
MAXM38643: Simplified Application Diagram
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Documentation

Data Sheet 1

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Software Resources

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Tools & Simulations

EE-Sim Power® Tools 1

The EE-Sim DC-DC Converter Tool uses your requirements to quickly create a complete power design including a schematic, BOM with commercially available parts, and time and frequency domain simulations. Your customized schematic can be downloaded for further analysis in the standalone EE-Sim OASIS Simulator, featuring SIMPLIS and SIMetrix SPICE engines.

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Evaluation Kits

eval board
schematic 1
MAXM38643AEVK-EMGA

Evaluation Kit for the MAXM38643

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Features and Benefits

  • Evaluates the MAXM38643A IC in a (2.1mm x 2.6mm) 10-pin EMGA Package
  • 1.8V to 5.5V Input Range
  • 0.7V to 3.3V Resistor-Configurable Output Voltages
  • Up to 600mA Output Current
  • Proven 2-Layer 1oz Copper PCB Layout
  • Demonstrates Compact Solution Size
  • Fully Assembled and Tested

Product Details

The MAXM38643A EMGA evaluation kit (EV kit) evaluates the MAXM38643A IC in an EMGA package. The MAXM38643A is an ultra-low quiescent current step-down DC-DC converter. The EV kit operates over an input range of 1.8V to 5.5V and provides resistor-configurable output voltages from 0.7V to 3.3V. The EV kit delivers up to 600mA of current. The EV kit comes with the MAXM38643AEMB+ installed.

Applications

  • Bluetooth® LE Devices
  • Hearables
  • Portable Space-Constrained Products
  • Single Li+ and Coin Cell Battery Products
  • Ultra-Low-Power IoT, NB IoT
  • Wearables
  • Wired, Wireless Products

eval board
schematic 2
MAXESSENTIAL02EP

Essential Analog Efficient Power Toolkit for the MAXM38643 / MAX38640 / MAX77839 / MAXM17225 / MAX17227A / MAX38889 / MAX38902C / MAX38913 / MAX77827

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Features and Benefits

  • Enables Immediate Testing of Nine Different Power Solutions
  • Includes nanoPower Buck and Boost Converters and Modules, Buck/Boost Converter, LDOs, and Continua Supercapacitor Backup Power Controller
  • Boards Designed to Accept 0.100” (2.54mm) Header Pin Strips for Mounting on Breadboards
  • Through Holes Accept Test Points for Connecting to Benchtop Equipment

Product Details

The MAXESSENTIAL02EP Essential Analog Efficient Power toolkit delivers products on ready-to-use boards for immediate testing and prototyping. The Essential Analog Efficient Power toolkit features products from the Buck, Boost, Buck-Boost, LDO, and Continua™ product categories. The selection also features nanoPower switching converter and module options.
MAXM38643AEVK-EMGA
Evaluation Kit for the MAXM38643
MAXM38643AEVK-EMGA: Board Photo
MAXESSENTIAL02EP
Essential Analog Efficient Power Toolkit for the MAXM38643 / MAX38640 / MAX77839 / MAXM17225 / MAX17227A / MAX38889 / MAX38902C / MAX38913 / MAX77827
MAXESSENTIAL02EP Essential Analog Efficient Power Toolkit

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