MIC45208 查看數據表（PDF） - Micrel
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MIC45208 Datasheet PDF : 36 Pages
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MIC45208-1/-2
26V 10A DC-to-DC Power Module
General Description
Micrel’s MIC45208 is a synchronous step-down regulator
module, featuring a unique adaptive ON-time control
architecture. The module incorporates a DC-to-DC
controller, power MOSFETs, bootstrap diode, bootstrap
capacitor, and an inductor in a single package; simplifying
the design and layout process for the end user.
This highly-integrated solution expedites system design
and improves product time-to-market. The internal
MOSFETs and inductor are optimized to achieve high
efficiency at a low output voltage. The fully-optimized
design can deliver up to 10A current under a wide input
voltage range of 4.5V to 26V, without requiring additional
cooling.
The MIC45208-1 uses Micrel’s HyperLight Load® (HLL)
while the MIC45208-2 uses Micrel’s Hyper Speed
Control™ (HSC) architecture, which enables ultra-fast load
transient response, allowing for a reduction of output
capacitance. The MIC45208 offers 1% output accuracy
that can be adjusted from 0.8V to 5.5V with two external
resistors. Additional features include thermal shutdown
protection, input undervoltage lockout, adjustable current
limit, and short circuit protection. The MIC45208 allows for
safe start-up into a pre-biased output.
Datasheet and other support documentation can be found
on Micrel’s web site at: www.micrel.com.
Features
• No compensation required
• Up to 10A output current
• >93% peak efficiency
• Output voltage: 0.8V to 5.5V with ±1% accuracy
• Adjustable switching frequency from 200kHz to 600kHz
• Enable input and open-drain power good (PG) output
• Hyper Speed Control (MIC45208-2) architecture
enables fast transient response
• HyperLight Load (MIC45208-1) improves light load
efficiency
• Supports safe startup into pre-biased output
• CISPR22, Class B compliant
• –40°C to +125°C junction temperature range
• Thermal-shutdown protection
• Short-circuit protection with hiccup mode
• Adjustable current limit
• Available in 52-pin 10mm × 10mm × 4mm QFN package
Applications
• High power density point-of-load conversion
• Servers, routers, networking, and base stations
• FPGAs, DSP, and low-voltage ASIC power supplies
• Industrial and medical equipment
Typical Application
Efficiency (VIN = 12V)
vs. Output Current (MIC45208-1)
100
5.0VOUT
90
3.3VOUT
80
2.5VOUT
1.8VOUT
70
1.5VOUT
1.2VOUT
60
1.0VOUT
50
0.8VOUT
40
30
20 fSW = 600kHz
10
0
2
4
6
8 10 12 14
OUTPUT CURRENT (A)
Hyper Speed Control is a trademark of Micrel, Inc.
HyperLight Load is a registered trademark 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
February 6, 2015
Revision 2.0
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