LTM4732

RECOMMENDED FOR NEW DESIGNS

16VIN, 4A Ultralow Noise Silent Switcher 3 μModule Regulator

Data Sheet (Rev. A) Product Selection Table
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Overview

  • Complete solution in <1cm2 (single-sided PCB) or 0.5cm2 (dual-sided PCB)
  • Low-noise Silent Switcher®3 architecture
    • Ultralow EMI emissions
    • Ultralow RMS noise (10Hz to 100kHz): 4μVRMS
  • ±1.5% maximum total DC output voltage error over line, load, and temperature
  • Input voltage range: 3V to 16V
  • Output voltage range: 0.3V to 6V
  • 4A maximum continuous output current
  • Adjustable and synchronizable: 400kHz to 4MHz
  • Current mode control, fast transient response
  • Forced continuous mode capability
  • Multiphase parallel with current sharing
  • Programmable power good
  • Available in a tiny 28-Pin 6.25mm × 4mm × 1.92mm BGA package

The LTM4732 is a complete 4A step-down Silent Switcher 3 power μModule® (micromodule) regulator in a tiny 6.25mm × 4mm × 1.92mm ball grid array (BGA) package. The package includes the switching controller, the power MOSFETs, an inductor, and the supporting components. Operating over an input voltage range of 3V to 16V, the LTM4732 supports an output range of 0.3V to 6V. A single resistor sets the output voltage, enabling unity-gain operation over the output range and resulting in virtually constant output noise independent of the output voltage. Only the bulk input and output capacitors are required to complete the design.

The LTM4732 employs the Silent Switcher 3 architecture with internal hot loop bypass capacitors to achieve low electromagnetic interference (EMI) and high efficiency. Additionally, the LTM4732 has an ultralow noise architecture to obtain exceptional low-frequency (<100kHz) output noise. The low electromagnetic interference (EMI) and the low-noise features make the LTM4732 ideal for noise-sensitive applications with a high-efficiency synchronous switching regulator. The LTM4732 is available with a RoHS-compliant terminal finish.

APPLICATIONS

  • Telecom, networking, and industrial equipment 
  • RF power supplies: PLLs, VCOs, mixers, LNAs, PAs 
  • Low-noise instrumentation 
  • High speed/high precision data converters
LTM4732
16VIN, 4A Ultralow Noise Silent Switcher 3 μModule Regulator
LTM4732 Typical Application Circuit LTM4732 Typical Application Graph LTM4732 Simplified Block Diagram LTM4732 Pin Configuration LTM4732 Chip Illustration
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Documentation

Data Sheet 1

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Tools & Simulations

LTpowerCAD 1

Design tools for the following parts are available in LTpowerCAD:

  • LTM4732
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

LTpowerCAD

LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

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