MIC2199_10 Datasheet, PDF (1/14 Pages) Micrel Semiconductor – 300kHz 4mm × 4mm Synchronous Buck Converter

Micrel, Inc.
MIC2199
MIC2199
300kHz 4mm × 4mm Synchronous Buck Converter
General Description
The MIC2199 is a high-power 300kHz synchronous buck
DC-to-DC controller housed in a small 4mm × 4mm MLF™
12-pin package. The MIC2199 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 MIC2199 an ideal solution for point-of-load DC-to-DC
conversion in 5V, 12V, 24V, and 28V systems.
The 300kHz 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 smaller external components, refer to the 500kHz
MIC2198.
The MIC2199 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
• 300kHz PWM operation
• 95% 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,
24V, 28V supplies
• Telecom equipment
• Wireless modems
• Servers
• Base stations
Typical Application
4.5VVto^IN 24V
22µF
2kΩ
2.2nF
U1 MIC2199BML
VIN
VDD
SD103BWS
4.7µF
EN/UVLO
BST
HSD
VSW
LSD
0.1µF
IRF7821
2µH
IRF7821
COMP
CSH
1nF
VOUT
FB
GND
0.01Ω
V_OUT
3.3V/7A
220µF
10kΩ
6.04kΩ
4.5V–24V to 3.3V/7A Converter
100.0
95.0
90.0
85.0
0
V_OUT = 3.3V
2
4
6
8
I_LOAD ^(A)
Efficiency for
V_IN = 5V and V_OUT = 3.3V
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
January 2010
1
M9999-011310