基于MIC2166設計的自適應降壓電源控制技術
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The MIC2166 operates over a supply range of 4.5V to 28V. It has an internal linear regulator which provides a regulated 5V supply to power the internal control circuitry.
MIC2166 operates at a constant 600kHz switching frequency and can be used to drive up to 25A of output current. The output voltage is adjustable down to 0.8V.
A unique Hyper Speed Control architecture enables ultra-fast transient response while reducing the output capacitance and also makes High VIN/Low VOUT operation possible.A UVLO feature is provided to ensure proper operation under power-sag conditions to prevent the external power MOSFET from over heating. Also, a soft-start feature is provided to reduce the inrush current. Short current sensing on the bottom MOSFET with hiccup mode operation ensures protection in case of an output short circuit. Further, the MIC2166 includes an EN pin to shut down the converter and a PGOOD pin to allow simple sequencing.
The MIC2166 is available in a 10 pin MSOP ePad package with a junction operating termperature range from C40℃ to +125℃. All support documentation can be found on
Micrel’s web site at: www.micrel.com.
MIC2166主要特性：
Hyper Speed Control architecture enables
- High delta V operation (VIN=28V and VOUT=0.8V)
- Smallest output capacitance
Built-in 5V regulator for single-supply operation
Any CapacitorTM stable
- Zero ESR to high ESR
Power-Good output
Input voltage range: 4.5V to 28V
5μA typical shutdown current
25A output current drive capability
Output down to +0.8V with ±1% accuracy
600kHz switching frequency
Internal 5ms digital soft-start
Thermal shutdown and hiccup current limit protection
No external current-sense resistor required
Pre-bias output safe
10-pin MSOP ePad package
C40℃ to +125℃ junction temperature range
MIC2166應用：
Set-top box, gateways, routers and DSL modems
Printers, scanners, graphic and video cards
Servers, PCs and processor core supply
Low-Voltage Distributed Power
圖1。MIC2166方框圖
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