MIC24053 Datasheet, PDF (1/30 Pages) Micrel Semiconductor – 12V, 9A High-Efficiency Buck Regulator

MIC24053
12V, 9A High-Efficiency Buck Regulator
SuperSwitcher II
General Description
The Micrel MIC24053 is a constant-frequency, synchronous
buck regulator featuring a unique adaptive on-time control
architecture. The MIC24053 operates over an input supply
range of 4.5V to 19V and provides a regulated output of up to
9A 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.
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 MIC24053 offers a full suite of 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. An open-drain Power
Good (PG) pin is provided.
The 9A Hyper Light Load^® part, MIC24054, is also available
on Micrel’s web site.
All support documentation is available on Micrel’s web site
at: www.micrel.com.
Features
• Hyper Speed Control architecture enables
- High Delta V operation (V_IN = 19V and V_OUT = 0.8V)
- Small output capacitance
• 4.5V to 19V voltage input
• 9A 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 “hiccup mode” short-circuit
protection
• Supports safe startup into a pre-biased load
• –40°C to +125°C junction temperature range
• Available in 28-pin 5mm × 6mm QFN package
Applications
• Servers, workstations
• 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
VIN = 12V
2
4
6
8
10
12
OUTPUT CURRENT (A)
Hyper Speed Control, SuperSwitcher II, and Any Capacitor are trademarks of Micrel, Inc.
Hyper Light Load is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
November 2012
M9999-110712-A