MIC2039 Datasheet, PDF (1/21 Pages) Micrel Semiconductor – High-Accuracy, High-Side, Adjustable Current Limit Power Switch

MIC2039
High-Accuracy, High-Side, Adjustable
Current Limit Power Switch
General Description
Features
The MIC2039 is a high-side MOSFET power distribution
switch providing increased system reliability by using 5%
current-limit accuracy.
The MIC2039 has an operating input voltage range from
2.5V to 5.5V, is internally current limited, and has thermal
shutdown to protect the device and system. The MIC2039
is offered with either active-high or active-low logic level
enable input controls. It has an open drain fault status
output flag with a built-in 32ms delay that asserts low
during overcurrent or thermal-shutdown conditions.
The MIC2039 switches feature an adjustable output
current limit that is resistor programmable from 0.2A to
2.5A. The MIC2039 switch also offers a unique, Kickstart
feature that allows momentary high-current surges up to
the secondary current limit (I_{LIMIT_2nd}) during startup or
while operating in steady state. This is useful for charging
loads with high inrush currents, such as capacitors. After
an overcurrent condition is established, these switches
enter into a constant current-limit mode unless the die
temperature exceeds the thermal-shutdown specification.
The MIC2039 is available in 6-pin SOT-23 and 6-pin 2mm
× 2mm thin DFN packages. The MIC2039 has an
operating junction temperature range of −40°C to +125°C.
• ±5% current limit accuracy
• Input supply range from 2.5V to 5.5V
• Low quiescent current: 100µA typical (switch ON)
• 75mΩ typical R_DS(ON) at 5.0V
• 0.2A to 2.5A adjustable output current
• Kickstart − momentary secondary current-limit threshold
(120ms period)
• Soft-start functionality
• Undervoltage lockout (UVLO)
• Fast 10µs short-circuit response time (non-Kickstart
options)
• Fault status output flag
• Logic-controlled enable (active-high, active-low)
• Thermal shutdown
• Pin compatible with the MIC2009/MIC2019
• 6-pin 2mm × 2mm thin DFN and 6-pin SOT-23
packages
• Junction temperature range from −40°C to +125°C
Applications
Data sheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
• USB peripherals and USB 2.0/3.0 compatible
• DTV/STB
• Notebooks and consumer electronics
• General-purpose power distribution
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Typical Application
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
June 7, 2013
Revision 1.1