MIC2103/04

75V, Synchronous Buck Controllers

featuring Adaptive On-Time Control

Hyper Speed Control™ Family

Hyper Speed Control, Hyper Light Load and Any Capacitor are trademarks of Micrel, Inc.

MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.

August 2012

M9999-080712-A

General Description

The

Micrel

MIC2103/04

are

constant-frequency,

synchronous buck controllers featuring a unique adaptive

ON-time control architecture. The MIC2103/04 operates

over an input supply range from 4.5V to 75V and can be

used to supply up to 15A of output current. The output

voltage is adjustable down to 0.8V with a guaranteed

accuracy of ±1%. The device operates with programmable

switching frequency from 200kHz to 600kHz.

Micrel’s Hyper Light Load™ architecture provides the same

high-efficiency and ultra fast transient response as the Hyper

Speed Control architecture under the medium to heavy loads,

but also maintains high efficiency under light load conditions

by transitioning to variable frequency, discontinuous-mode

operation.

The MIC2103/04 offers a full suite of protection features to

ensure protection of the IC during fault conditions. These

include under-voltage 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

Features



Hyper Speed Control architecture enables

-

-

Any Capacitor



4.5V to 75V input voltage



0.8V Reference Voltage with ±1% accuracy



200kHz to 600kHz, programmable switching frequency



Hyper Light Load Control (MIC2103 only)



Hyper Speed Control (MIC2104 only)



Enable input, Power-Good output



Built-in 5V regulator for single-supply operation



Programmable current limit and fold-back “hiccup”

mode short-circuit protection



5ms internal soft-start, internal compensation, and

thermal shutdown



Supports safe start-up into a pre-biased output



–40

C to +125C junction temperature range



Available in 16-pin 3mm x 3mm MLF

Applications



Distributed power systems



Networking/Telecom Infrastructure



Printers, scanners, graphic cards and video cards

_________________________________________________________________________________________________________________________

Typical Application

vs. Output Current (MIC2103)

0

10

20

30

40

50

60

70

80

90

100

01 2

345 678 9 10 11 12 13 14

OUTPUT CURRENT (A)

5.0V

3.3V

2.5V

1.8V

1.2V

0.8V