MIC28510_12 Datasheet, PDF (1/30 Pages) Micrel Semiconductor – 75V/4A Hyper Speed Control Synchronous DC/DC Buck Regulator

MIC28510
75V/4A Hyper Speed Control
Synchronous DC/DC Buck Regulator
SuperSwitcher II
General Description
Features
The Micrel MIC28510 is an adjustable–frequency,
synchronous buck regulator featuring unique adaptive on–
time control architecture. The MIC28510 operates over an
input supply range of 4.5V to 75V and provides a regulated
output of up to 4A of output current. The output voltage is
adjustable down to 0.8V with a guaranteed accuracy of ±1%.
Micrel’s Hyper Speed Control architecture allows for ultra–
fast transient response while reducing the output capacitance
and also makes (High V_IN) / (Low V_OUT) operation possible.
This adaptive t_ON ripple control architecture combines the
advantages of fixed–frequency operation and fast transient
response in a single device.
The MIC28510 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, internal soft–start to reduce
inrush current, foldback current limit, “hiccup” mode short-
circuit protection, and thermal shutdown.
All support documentation can be found on Micrel’s web
site at: www.micrel.com.
 Hyper Speed Control architecture enables:
 High Delta V operation (V_IN = 75V and V_OUT = 0.8V)
 Small output capacitance
 4.5V to 75V voltage input
 4A output current capability, up to 95% efficiency
 Adjustable output voltage form 0.8V to 24V
 ±1% FB accuracy
 Any Capacitor stable:
 Zero-ESR to high–ESR output capacitors
 100kHz to 500kHz switching frequency
 Internal compensation
 Foldback current–limit and “hiccup” mode short-circuit
protection
 Thermal shutdown
 Supports safe startup into a pre–biased load
 –40C to +125C junction temperature range
 28-pin 5mm  6mm MLF^® package
Applications
 Distributed power systems
 Communications/networking infrastructure
 Industrial power
 Solar energy
___________________________________________________________________________________________________________
Typical Application
100
90
80
70
60
50
40
30
20
10
0
Efficiency (VIN = 48V)
vs. Output Current
f_SW = 250kHz
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.8V
1
2
3
4
5
6
OUTPUT CURRENT (A)
Hyper Speed Control, SuperSwitcher II and Any Capacitor are trademarks of Micrel, Inc.
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
March 2012
M9999-030912-A