MIC45205 Datasheet, PDF (1/31 Pages) Micrel Semiconductor – 26V/6A DC-to-DC Power Module

MIC45205-1/-2
26V/6A DC-to-DC Power Module
General Description
Micrel’s MIC45205 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 6A current under a wide input
voltage range of 4.5V to 26V, without requiring additional
cooling.
The MIC45205-1 uses Micrel’s HyperLight Load^® (HLL)
MIC45205-2 uses Micrel’s Hyper Speed Control™
architecture which enables ultra-fast load transient
response, allowing for a reduction of output capacitance.
The MIC45205 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 MIC45205 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 6A 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 output
• Hyper Speed Control (MIC45205-2) architecture
enables fast transient response
• HyperLight Load (MIC45205-1) 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 8mm × 8mm × 3mm 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 (V_IN = 12V)
vs. Output Current (MIC45205-1)
100
5.0V_OUT
90
3.3V_OUT
80
2.5V_OUT
70
1.8V_OUT
1.5V_OUT
60
1.2V_OUT
50
1.0V_OUT
0.8V_OUT
40
30
20
f_SW = 600kHz
10
0123456789
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 [phone] • fax + 1 [phone] • http://www.micrel.com
April 15, 2014
Revision 1.0