MIC23030 Datasheet, PDF (1/17 Pages) Micrel Semiconductor – 8MHz PWM 400mA Buck Regulator with HyperLight Load

MIC23030
8MHz PWM 400mA Buck Regulator with
HyperLight Load™
General Description
Features
The MIC23030 is a high efficiency 8MHz 400mA
synchronous buck regulator with HyperLight Load™ mode.
HyperLight Load™ provides very high efficiency at light
loads and ultra-fast transient response which is perfectly
suited for supplying processor core voltages. An
additional benefit of this proprietary architecture is very low
output ripple voltage throughout the entire load range with
the use of small output capacitors. The tiny 1.6mm x
1.6mm Thin MLF^® package saves precious board space
and requires only three external components.
The MIC23030 is designed for use with a very small
inductor, down to 0.47µH, and an output capacitor as small
as 2.2 µF that enables a sub-1mm height.
The MIC23030 has a very low quiescent current of 21µA
and achieves as high as 83% efficiency at 1mA. At higher
loads, the MIC23030 provides a constant switching
frequency around 8MHz while achieving peak efficiencies
up to 91%.
The MIC23030 is available in a 6-pin 1.6mm x 1.6mm Thin
MLF^® package with an operating junction temperature
range from –40°C to +125°C.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
• Input voltage: 2.7V to 5.5V
HyperLight Load™
• 400mA output current
• Up to 91% efficiency and 83% at 1mA
• 21µA typical quiescent current
• 8MHz PWM operation in continuous mode
• Ultra fast transient response
• Low voltage output ripple
− 14mVpp ripple in HyperLight Load^™ mode
− 5mV output voltage ripple in full PWM mode
• Fully integrated MOSFET switches
• 0.01µA shutdown current
• Thermal shutdown and current limit protection
• Fixed and adjustable output voltage options available
• 6-pin 1.6mm x 1.6mm Thin MLF^®
• –40°C to +125°C junction temperature range
Applications
• Mobile handsets
• Portable media/MP3 players
• Portable navigation devices (GPS)
• WiFi/WiMax/WiBro modules
• Digital Cameras
• Wireless LAN cards
• USB powered devices
• Portable applications
____________________________________________________________________________________________________________
Typical Application
U1 MIC23030
V_IN
2.7V to 5.5V
1
VIN
SW ²
L1
C1
EN
4
EN
SNS ³
GND
AGND
5
PGND
6
V_OUT
C2
GND
Efficiency V = 2.5V
OUT
100
90
V = 3.0V
IN
80
V = 3.6V
IN
70
V = 4.2V
IN
60
L = 0.47µH
C = 4.7µF
OUT
50
1
10
100
1000
OUTPUT CURRENT (mA)
HyperLight Load is a trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademark Amkor Technology Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
August 2008
M9999-082608-B