MIC23158 Datasheet, PDF (1/20 Pages) Micrel Semiconductor – 3MHz PWM Dual 2A Buck Regulator with HyperLight Load and Power Good

MIC23158/9
3MHz PWM Dual 2A Buck Regulator with
HyperLight Load^ and Power Good
General Description
Features
The MIC23158/9 is a high-efficiency, 3MHz, dual, 2A
synchronous buck regulator with HyperLight Load^ mode,
power good output indicator, and programmable soft start.
The MIC23159 also provides an auto discharge feature
that switches in a 225Ω pull down circuit on its output to
discharge the output capacitor when disabled. HyperLight
Load provides very high efficiency at light loads and ultra-
fast transient response which makes the MIC23158/9
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 20-pin 3mm x 4mm
MLF^® package saves precious board space and requires
seven external components for each channel.
The MIC23158/9 is designed for use with a very small
inductor, down to 0.47µH, and an output capacitor as small
as 2.2µF that enables a total solution size, less than 1mm
in height.
The MIC23158/9 has a very low quiescent current of 45µA
and achieves a peak efficiency of 94% in continuous
conduction mode. In discontinuous conduction mode, the
MIC23158/9 can achieve 83% efficiency at 1mA.
• 2.7V to 5.5V input voltage
• Adjustable output voltage (down to 1.0V)
• 2 independent 2A outputs
• Up to 94% peak efficiency
• 83% typical efficiency at 1mA
• 2 independent power good indicators
• Independent programmable soft start
• 45µA typical quiescent current
• 3MHz PWM operation in continuous conduction mode
• Ultra-fast transient response
• Fully-integrated MOSFET switches
• Output pre-bias safe
• 0.1µA shutdown current
• Thermal-shutdown and current-limit protection
• 20-pin 3mm x 4mm MLF package
• Internal 225Ω pull-down circuit on output (MIC23159)
• –40°C to +125°C junction temperature range
Applications
The MIC23158/9 is available in a 20-pin 3mm x 4mm 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.
• Solid State Drives (SSD)
• Smart phones
• Tablet PCs
• Mobile handsets
• Portable devices (PMP, PND, UMPC, GPS)
• WiFi/WiMax/WiBro applications
_______________________________________________________________________________________________________
Typical Application
HyperLight Load is a registered trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademarks Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
November 2012
M9999-110812-A