MIC26950 Datasheet PDF - MICREL

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MIC26950
MICREL

Part Number MIC26950
Description 12A Hyper Speed Control Synchronous DC-DC Buck Regulator
Page 28 Pages


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MIC26950
12A Hyper Speed ControlTM
Synchronous DC-DC Buck Regulator
SuperSwitcher IITM
General Description
The Micrel MIC26950 is a constant-frequency, synchronous
buck regulator featuring a unique digitally modified adaptive
ON-time control architecture. The MIC26950 operates over
an input supply range of 4.5V to 26V and provides a
regulated output at up to 12A of output current. The output
voltage is adjustable down to 0.8V with a typical accuracy of
±1%, and the device operates at a switching frequency of
300kHz.
Micrel’s Hyper Speed ControlTM architecture allows for ultra-
fast transient response while reducing the output capacitance
and also makes (High VIN)/(Low VOUT) operation possible.
This digitally modified adaptive tON ripple control architecture
combines the advantages of fixed-frequency operation and
fast transient response in a single device.
The MIC26950 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, fold-back 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 ControlTM architecture enables
- High delta V operation (VIN = 26V and VOUT = 0.8V)
- Small output capacitance
4.5V to 26V input voltage
Adjustable output from 0.8V to 5.5V (±1% accuracy)
Any CapacitorTM Stable
- Zero-ESR to high-ESR output capacitance
12A output current capability
300kHz switching frequency
Internal compensation
Up to 95% efficiency
6ms internal soft-start
Foldback current-limit and “hiccup” mode short-circuit
protection
Thermal shutdown
Supports safe start-up into a pre-biased load
–40°C to +125°C junction temperature range
28-pin 5mm X 6mm MLF® package
Applications
Distributed power systems
Communications/networking infrastructure
Set-top box, gateways and routers
Printers, scanners, graphic cards and video cards
____________________________________________________________________________________________________________
Typical Application
100
95
90
85
80
75
70
65
60
0
Efficiency (VIN = 12V)
vs. Output Current
5.0V
3.3V
2.5V
1.5V
1.0V
3 6 9 12
OUTPUT CURRENT (A)
15
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
July 2011
M9999-070111-C

MIC26950 datasheet pdf
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Related : Start with MIC2695 Part Numbers by
MIC26950 12A Hyper Speed Control Synchronous DC-DC Buck Regulator MIC26950
MICREL
MIC26950 pdf

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