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MIC28500

Micrel Semiconductor
Part Number MIC28500
Manufacturer Micrel Semiconductor
Description Synchronous DC-DC Buck Regulator
Published Mar 27, 2012
Detailed Description MIC28500 75V/4A Hyper Speed Control™ Synchronous DC-DC Buck Regulator SuperSwitcher II™ General Description The Micrel ...
Datasheet PDF File MIC28500 PDF File

MIC28500
MIC28500

Overview
MIC28500 75V/4A Hyper Speed Control™ Synchronous DC-DC Buck Regulator SuperSwitcher II™ General Description The Micrel MIC28500 is an adjustable frequency, synchronous buck regulator featuring a unique adaptive ontime control architecture.
The MIC28500 operates over an input supply range of 30V to 75V and provides a regulated output of up to 4A of output current.
The output voltage is adjustable down to 0.
8V with a guaranteed accuracy of ±1%.
Micrel’s Hyper Speed Control™ architecture allows for ultrafast transient response while reducing the output capacitance and also makes (High VIN)/(Low VOUT) operation possible.
This adaptive tON ripple control architecture combines the advantages of fixed-frequency operation and fast transient response in a single device.
The MIC28500 offers a full suite of protection features to ensure protection of the IC during fault conditions.
These include undervoltage lockout to ensure proper operation under power-sag conditions, internal soft-start to reduce inrush current, foldback current limit, “hiccup” mode shortcircuit protection and thermal shutdown.
All support documentation can be found on Micrel’s web site at: www.
micrel.
com.
Features • Hyper Speed Control™ architecture enables -High Delta V operation (VIN = 75V and VOUT = 0.
8V) -Small output capacitance 30V to 75V voltage input Adjustable output down to 0.
8V ±1% FB accuracy Any Capacitor™ Stable - Zero-ESR to high-ESR output capacitors 4A output current capability, up to 90% efficiency 100kHz to 500kHz switching frequency Internal compensation Foldback current-limit and “hiccup” mode short-circuit protection Thermal shutdown Supports safe startup into a pre-biased load –40°C to +125°C junction temperature range 28-pin 5mm × 6mm MLF® package • • • • • • • • • • • • www.
DataSheet.
co.
kr Applications • Distributed power systems • Communications/networking infrastructure • Set-top box, gateways and routers • Printers, scanners, graphic cards and video cards ___________________...


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