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MIC2198

Micrel Semiconductor
Part Number MIC2198
Manufacturer Micrel Semiconductor
Description 500kHz 4mm x 4mm Synchronous Buck Controller
Published Mar 22, 2005
Detailed Description MIC2198 MIC2198 Micrel, Inc. 500kHz 4mm × 4mm Synchronous Buck Controller General Description The MIC2198 is a high-...
Datasheet PDF File MIC2198 PDF File

MIC2198
MIC2198

Overview
MIC2198 MIC2198 Micrel, Inc.
500kHz 4mm × 4mm Synchronous Buck Controller General Description The MIC2198 is a high-power 500kHz synchronous buck DC-to-DC controller housed in a small 4mm × 4mm MLF™ 12-pin package.
The MIC2198 operates from a wide 4.
5V to 32V input and can be programmed for output voltages from 0.
8V to 6V.
The wide input voltage capability makes the MIC2198 an ideal solution for point-of-load DC-to-DC conversion in 5V, 12V and higher systems.
The 500kHz switching frequency allows the use of a small inductor and small output capacitors.
The current mode PWM control along with the external COMP pin allows for ease of stability compensation and fast transient response across a wide range of applications.
An all N-Channel synchronous architecture and powerful output drivers allow up to 20A of output current capability.
For higher efficiency at higher input voltages, refer to the 300kHz MIC2199.
The MIC2198 is available in a 12-pin 4mm × 4mm MLF™ package with a junction temperature range from –40°C to 125°C.
Features • 4.
5V to 32V input range • 4mm × 4mm MLF™ package • 500kHz PWM operation • >90% efficiency • Output voltage adjustable down to 0.
8V • 20A output current capability • Drives all N-Channel MOSFETs • Logic controlled micropower shutdown • Cycle-by-cycle current limiting • Adjustable undervoltage lockout • Frequency foldback overcurrent protection Applications • Point-of-load DC-to-DC conversion from 5V, 12V and higher supplies • Telecom equipment • Wireless modems • Servers • Base stations Typical Application VIN 5.
5V to 24V 22µF 2kΩ 2.
2nF U1 MIC2198BML VIN VDD SD103BWS 4.
7µF EN/UVLO BST HSD VSW LSD 0.
1µF IRF7821 1µH IRF7821 COMP CSH VOUT 1nF GND FB 0.
01Ω VOUT 3.
3V/7A 220µF 10kΩ 6.
04kΩ 5.
5V–24V to 3.
3V/7A Converter Efficiency vs.
Load Current 100 95 90 85 80 75 70 65 60 VIN = 5.
5V 55 VOUT = 3.
3V 500 2 4 6 ILOAD (A) 8 MLF and MicroLeadFrame are trademarks of Amkor Technology, Inc.
Micrel, Inc.
• 2180 Fortune Drive • San...


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