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MIC24051 Datasheet, PDF (1/30 Pages) Micrel Semiconductor – 12V, 6A High-Efficiency Buck Regulator | |||
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MIC24051
12V, 6A High-Efficiency Buck Regulator
SuperSwitcher II
General Description
Features
The Micrel MIC24051 is a constant-frequency, synchronous
buck regulator featuring a unique adaptive on-time control
architecture. The MIC24051 operates over an input supply
range of 4.5V to 19V and provides a regulated output of up to
6A of output current. The output voltage is adjustable down to
0.8V with a guaranteed accuracy of ±1%, and the device
operates at a switching frequency of 600kHz.
Micrelâs Hyper Speed Control architecture allows for ultra-
fast transient response while reducing the output capacitance
and also makes (High VIN)/(Low VOUT) operation possible.
This adaptive tON ripple control architecture combines the
advantages of fixed-frequency operation and fast transient
response in a single device.
The MIC24051 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, âhiccup modeâ short-
circuit protection and thermal shutdown. An open-drain
Power Good (PG) pin is provided.
The 6A HyperLight Load® part, MIC24052, is also available
on Micrelâs web site.
All support documentation can be found on Micrelâs web
site at: www.micrel.com.
⢠Hyper Speed Control architecture enables
- High delta V operation (VIN = 19V and VOUT = 0.8V)
- Small output capacitance
⢠4.5V to 19V voltage input
⢠6A output current capability, up to 95% efficiency
⢠Adjustable output from 0.8V to 5.5V
⢠±1% feedback accuracy
⢠Any Capacitor stable - zero-to-high ESR
⢠600kHz switching frequency
⢠No external compensation
⢠Power Good (PG) output
⢠Foldback current-limit and âhiccup modeâ short-circuit
protection
⢠Supports safe start-up into a pre-biased load
⢠â40°C to +125°C junction temperature range
⢠Available in 28-pin 5mm à 6mm QFN package
Applications
⢠Servers and work stations
⢠Routers, switches, and telecom equipment
⢠Base stations
_________________________________________________________________________________________________________________________
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
123 45678
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 +1 (408) 944-0800 ⢠fax + 1 (408) 474-1000 ⢠http://www.micrel.com
November 2012
M9999-112612-A
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