MIC2198 Ver la hoja de datos (PDF) - Micrel
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MIC2198 Datasheet PDF : 14 Pages
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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 efï¬ciency 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% efï¬ciency
• 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
1nF
VOUT
FB
GND
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
50
0
2
4
6
8
ILOAD (A)
MLF and MicroLeadFrame are trademarks of Amkor Technology, Inc.
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
October 2005
1
MIC2198
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