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MIC22405 Buck Regulator


High-efficiency, 4 A integrated switch synchronous buck regulator from Micrel with frequency programmable up to 4 MHz


Micrel's MIC22405 Buck Regulator The Micrel MIC22405 is a high efficiency, 4 A integrated switch synchronous buck (step-down) regulator. The MIC22405 is optimized for highest efficiency, achieving more than 95% efficiency while still switching at 1 MHz. The ultra-high speed control loop keeps the output voltage within regulation even under the extreme transient load swings commonly found in FPGAs and low-voltage ASICs. The output voltage is pre-bias safe and can be adjusted down to 0.7 V to address all low-voltage power needs.

The MIC22405 offers a full range of sequencing and tracking options. The Enable/Delay (EN/DLY) pin, combined with the Power Good (PG) pin, allows multiple outputs to be sequenced in any way during turn-on and turn-off. The Ramp Control™ (RC) pin allows the device to be connected to another product in the MIC22xxx and/or MIC68xxx family, to keep the output voltages within a certain ∆V on start-up.

Features
  • Input voltage range: 2.9 V to 5.5 V
  • Output voltage adjustable down to 0.7 V
  • Output load current up to 4 A
  • Safe start-up into a pre-biased output
  • Full sequencing and tracking capability
  • Efficiency > 95% across a broad load range
  • Programmable frequency 300 kHz to 4 MHz
  • Ultra-fast transient response
  • Easy RC compensation
  • 100% maximum duty cycle
  • Fully-integrated MOSFET switches
  • Thermal shutdown and current-limit protection
  • 20-pin 3 mm x 4 mm MLF®
  • –40°C to +125°C junction temperature range

Digi-Key P/N Manufacturer P/N Packaging Description  
576-3932-2-ND MIC22405YML TR Tape & Reel IC BUCK SYNC ADJ 4A 20MLF Datasheet
576-3932-1-ND Cut Tape
576-3932-6-ND Digi-Reel®