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MIC28510-5V-EV 数据手册 - Microchip(微芯)
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MIC28510
75V/4A Hyper Speed Control
Synchronous DC/DC Buck Regulator
SuperSwitcher II
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 +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
March 2012
M9999-030912-A
General Description
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
.
Features
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
–40C to +125C junction temperature range
28-pin 5mm 6mm MLF
®
package
Applications
Distributed power systems
Communications/networking infrastructure
Industrial power
Solar energy
___________________________________________________________________________________________________________
Typical Application
Efficiency (V
IN
= 48V)
vs. Output Current
10
20
30
40
50
60
70
80
90
100
0123456
OUTPUT CURRENT (A)
EFFICIENCY (%)
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.8V
f
SW
= 250kHz
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