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High-Frequency, High-Efficiency Buck Converter with Valley Current-Mode Control

A4403

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The A4403 is a high-efficiency buck converter ideal for high-frequency, high step-down ratio applications. Valley current-mode control enables fast transient response and minimizes external component count.

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Top Features

Packaging

  • Extremely fast load-transient response with minimal output voltage delta
  • Achieves high step-down ratios with on-times <50 ns
  • User-configurable on-time, achieving switching frequencies up to 2 MHz
  • Minimal external components required
  • Optimized for low value filter capacitors and inductors
  • Wide input voltage range: 9 to 46 V
  • Output Current: 3 A
  • Low standby current <100 µA
  • Supplied in thermally-enhanced QFN package

Typical Applications

The device package is a 16-contact, 4 mm × 4 mm, 0.75 mm nominal overall height QFN, (suffix EU), with exposed pad for enhanced thermal dissipation. It is lead (Pb) free, with 100% matte tin leadframe plating.

EU Package Documentation

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Part Number Specifications and Availability

Part Number
Description
Status
Topology
Select all
Buck
Operating Input Voltage Min (V)
9
99
9
≥
≤
Operating Input Voltage Max (V)
46
4646
46
≥
≤
Output Current (A)
3
33
3
≥
≤
Converter Switching Freq. (MHz)
Select all
0.45 to 2.0
Package
Select all
16-Pin QFN
Market
Select all
Consumer
Industrial
 
Samples
Part Composition / RoHS DataCheck StockECAD
A4403GEUTR-TBuck9.0046.03.0016-Pin QFNIndustrial, ConsumerView DataCheck Distributor StockECAD model image
Part Number
Topology
Operating Input Voltage Min
(V)
Operating Input Voltage Max
(V)
Output Current
(A)
Package
Market
A4403GEUTR-TBuck9.0046.03.0016-Pin QFNIndustrialConsumer

Documentation and Resources

Documentation

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Application Note
Short Duty Cycles Lead to Smaller DC-DC Converters