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

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

10

20

30

40

50

60

70

80

90

100

0

1

2

3

4

5

6

7

8

9

OUTPUT CURRENT (A)

Efficiency (V

vs. Output Current (MIC45205-1)

f

1.8V

OUT

5.0V

OUT

1.2V

OUT

1.5V

OUT

0.8V

OUT

1.0V

OUT

2.5V

OUT

3.3V

OUT

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

April 15, 2014

Revision 1.0