MIC20XX Family
Fixed and Adjustable Current Limiting
Power Distribution Switches
General Description
Features
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 on page 6 and Pin
Configuration Drawings on page 8.
• MIC20X3 – MIC20X9
70mΩ typical on-resistance @ 5V
• MIC2005A/20X9A
170mΩ typical on-resistance @ 5V
• Enable active high or active low
• 2.5V – 5.5V operating range
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
• 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)
• Under voltage lock-out (UVLO)
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.
• 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
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
current limit (ILIMIT_2nd) without sacrificing overall system
safety.
• Thermal Protection
* Available on some family members
Applications
• Digital televisions (DTV)
• Set top boxes
• PDAs
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® packages.
• Printers
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
• USB / IEEE 1394 power distribution
• Desktop and laptop PCs
• Game consoles
• Docking stations
___________________________________________________________________________________________________________
Typical Application
5V Supply
MIC2005A
Logic
VBUS
120µF
Controller
VIN
GND
EN
VOUT
USB
Port
VIN
FAULT/
ON/OFF
1µF
OVERCURRENT/
Kickstart is a trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Protected by U.S. Patent No. 7,170,732
CableCARD is a trademark of CableLabs.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
M9999-090309-A
September 2009