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MIC2124

Micrel Semiconductor
Part Number MIC2124
Manufacturer Micrel Semiconductor
Description Synchronous Current Mode Buck Controller
Published Dec 13, 2010
Detailed Description MIC2124 Constant Frequency, Synchronous Current Mode Buck Controller Hyper Speed Control™ Family General Description Th...
Datasheet PDF File MIC2124 PDF File

MIC2124
MIC2124


Overview
MIC2124 Constant Frequency, Synchronous Current Mode Buck Controller Hyper Speed Control™ Family General Description The Micrel MIC2124 is a member of the Hyper Speed Contro™l family of DC-DC controllers.
It uses an adaptive on-time current mode control scheme and operates at a constant frequency.
The MIC2124 operates over a supply range of +3V to +18V, and is independent of the IC supply voltage VIN.
It operates at a fixed 300kHz switching frequency and can be used to provide up to 25A of output current.
The output voltage is adjustable down to +0.
8V.
The MIC2124 includes an EN/COMP pin that can be pulled low to shut down the converter.
The MIC2124 optimizes performance and ensures stability with external compensation.
The UVLO is provided to ensure proper operation under power-sag conditions and to make sure that the external power MOSFET has enough voltage to work with.
An internal digital soft-start ensures reduced inrush current.
Cycle-by-cycle current limiting ensures FET protection.
The MIC2124 is available in a 10-pin MSOP package with a junction temperature operating range from –40ºC to +125ºC.
Features • • • • • • • • • • • • • • • +3V to +18V input voltage 25A output current capability TM Any Capacitor stable - Zero ESR to high ESR Output down to 0.
8V with ±1% FB accuracy Up to 94% efficiency 300kHz switching frequency All N-Channel MOSFET design Shutdown feature with EN/COMP No current-sense resistor needed Internal 4ms digital soft-start Thermal shutdown Pre-bias output safe Cycle-by-Cycle foldback current-limit protection 10-pin MSOP package –40ºC to +125ºC junction temperature range Applications • • • • • • • Printers and scanners Graphic and video cards PCs and servers Microprocessor core supply Low-voltage distributed power Telecommunication and networking Set-top box, gateways and router Typical Application 12V to 3.
3V Efficiency 100 90 EFFICIENCY (%) 80 70 VHSD = 12V VIN = 5V 0 2 4 6 8 O UT PUT CURRENT (A) 10 60 MIC2124 Adjustable Output...


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