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 7.
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) subfamily offers a unique new
patented feature: KICKSTART™, which allows
momentary high current surges up to the secondary
current limit (I
LIMIT_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.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
70mΩ typical on-resistance @ 5V
170mΩ typical on-resistance @ 5V (MIC2005A)
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
*
User adjustable current limit from 0.2A to 2.1A
*
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
MIC20X5
VIN
GND
EN
(1,3)
VOUT
(2,3)
V
BUS
120µF
USB
Port
IADJ
FAULT/
Figure 1. Typical Application Circuit
Notes:
(1) Depending on the family member this pin can function as FAULT/, IADJ, or VUVLO.
(2) Depending on the family member this pin can function as IADJ, or CSLEW.
(3) See Pin Configuration and Functional Diagram.
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
January 2009
M9999-012109-A
工业自动化与控制
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