MIC20XX Family
Fixed and Adjustable Current Limiting
Power Distribution Switches
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 on page 6 and Pin
Configuration Drawings on page 8.
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
current limit (ILIMIT_2nd) without sacrificing overall system
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 packages.
Datasheets and support documentation can be found on
Micrel’s web site at:
www.micrel.com.
Features
•
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
•
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)
•
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
5V Supply
Logic
Controller
VIN
ON/OFF
OVERCURRENT/
1µF
MIC2005A
VIN
GND
EN
FAULT/
VOUT
V
BUS
120µF
USB
Port
Figure 1. Typical Application Circuit
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 (
408
) 944-0800 • fax + 1 (408) 474-1000 •
http://www.micrel.com
February 2011
M9999-020311-D
微控制器 MCU
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