MIC24052 Datasheet, PDF (1/30 Pages) Micrel Semiconductor – 12V, 6A High-Efficiency Buck Regulator

MIC24052
12V, 6A High-Efficiency Buck Regulator
SuperSwitcher II
General Description
Features
The Micrel MIC24052 is a constant-frequency,
synchronous DC/DC buck regulator featuring adaptive on-
time control architecture. The MIC24052 operates over a
supply range of 4.5V to 19V. It has an internal linear
regulator which provides a regulated 5V to power the
internal control circuitry. The MIC24052 operates at a
constant 600kHz switching frequency in continuous-
conduction mode and can be used to provide up to 6A of
output current. The output voltage is adjustable down to
0.8V.
Micrel’s HyperLight Load^® architecture provides the same
high-efficiency and ultra-fast transient response as the
Hyper Speed Control architecture under medium to heavy
loads, but also maintains high efficiency under light load
conditions by transitioning to variable-frequency,
discontinuous-mode operation.
The MIC24052 offers a full suite of protection features to
ensure protection of the IC during fault conditions. These
include undervoltage lockout to ensure proper operation
under power-sag conditions, thermal shutdown, internal
soft-start to reduce the inrush current, foldback current
limit and “hiccup mode” short-circuit protection. The
MIC24052 includes a power good (PG) output to allow
simple sequencing.
The 6A Hyper Speed Control part, MIC24051, is also
available on Micrel’s web site.
• HyperLight Load efficiency – up to 80% at 10mA
• Hyper Speed Control architecture enables
− High delta V operation (V_IN = 19V and V_OUT = 0.8V)
− Small output capacitance
• Input voltage range: 4.5V to 19V
• Output current up to 6A
• Up to 95% efficiency
• Adjustable output voltage from 0.8V to 5.5V
• ±1% FB accuracy
• Any Capacitor™ stable − zero-to-high ESR
• 600kHz switching frequency
• Power good (PG) output
• Foldback current-limit and “hiccup mode” short-circuit
protection
• Safe start-up into pre-biased loads
• –40°C to +125°C junction temperature range
• Available in 28-pin 5mm × 6mm QFN package
Applications
• Servers and work stations
• Routers, switches, and telecom equipment
• Base stations
All support documentation can be found on Micrel’s web
site at: www.micrel.com.
___________________________________________________________________________________________________________
Typical Application
100
95
90
85
80
75
70
65
60
55
50
0
Efficiency (VIN = 12V)
vs. Output Current
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
0.8V
12345678
OUTPUT CURRENT (A)
HyperLight Load, is a registered trademark of Micrel, Inc.
Hyper Speed Control, SuperSwitcher II, and Any Capacitor are trademarks of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
December 2012
M9999-120312-A