MIC20XX Family

Fixed and Adjustable Current Limiting

Power Distribution Switches

Kickstart is a trademark of Micrel, Inc.

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

CableCARD is a trademark of CableLabs.

Protected by U.S. Patent No. 7,170,732

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (

General Description

MIC20XX family of switches are current limiting, high-side

power switches, designed for general purpose power

distribution and control in digital televisions (DTV), printers,

set top boxes (STB), PCs, PDAs, and other peripheral

devices (see Functionality Table and Pin Configuration

drawings)

MIC20XX family’s primary functions are current limiting

and power switching. They are thermally protected and will

shutdown should their internal temperature reach unsafe

levels, protecting both the device and the load, under high-

current or fault conditions

Features include fault reporting, fault blanking to eliminate

noise-induced false alarms, output slew rate limiting, under

voltage detection, automatic-on output, and enable pin

with choice of either active low or active high enable. The

FET is self-contained, with a fixed- or user-adjustable

current limit. The MIC20XX family is ideal for any system

where current limiting and power control are desired.

The MIC201X (3 ≤ x ≤ 9) and MIC2019A switches offer a

unique new patented feature: Kickstart™, which allows

momentary high-current surges up to the secondary

safety.

The MIC20xx family is offered, depending on the desired

features, in a space-saving 5-pin SOT-23, 6-pin SOT-23,

and 2mm x 2mm MLF

Datasheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Features

• MIC20X3 – MIC20X9

70m

Ω typical on-resistance @ 5V

• MIC2005A/20X9A

170m

Ω typical on-resistance @ 5V

• Enable active high or active low

• 2.5V – 5.5V operating range

• Pre-set current limit values of 0.5A, 0.8A, and 1.2A*

• Adjustable current limit 0.2A to 2.0A* (MIC20X7-

MIC20X9)

• Adjustable current limit 0.1A to 0.9A* (MIC20X9A)

• Undervoltage lock-out (UVLO)

• Variable UVLO allows adjustable UVLO thresholds*

• Automatic load discharge for capacitive loads*

• Soft-start prevents large current inrush

• Adjustable slew rate allows custom slew rates*

• Automatic-on output after fault

• Thermal protection

* Available on some family members

Applications

• Digital televisions (DTV)

• Set top boxes

• PDAs

• Printers

• USB / IEEE 1394 power distribution

• Desktop and laptop PCs

• Game consoles

• Docking stations

___________________________________________________________________________________________________________

Typical Application

VIN

VOUT

MIC2005A

USB

Port

GND

EN

FAULT/

5V Supply

VIN

Logic

Controller

ON/OFF

OVERCURRENT/

1µF

120µF

Figure 1. Typical Application Circuit

August 2011

M9999-080211-D