General Description
The MIC2039 is a high-side MOSFET power
distribution switch that provides 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 32 ms
delay that asserts low during overcurrent or
thermal-shutdown conditions.
The MIC2039 features an adjustable output current
limit that is resistor-programmable from 0.2A to 2.5A.
The MIC2039 also offers a unique kickstart feature that
allows momentary high-current surges up to the
secondary current limit (ILIMIT_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
2 mm x 2 mm UDFN packages. The MIC2039 has an
operating junction temperature range of –40°C to +125°C.

Features
• ±5% Current-Limit Accuracy
• Input Supply Range from 2.5V to 5.5V
• Low Quiescent Current: 100 μA Typical (Switch
ON)
• 75 mΩ Typical RDS(ON) at 5V
• 0.2A to 2.5A Adjustable Output Current
• Kickstart: Momentary Secondary Current-Limit
Threshold (120 ms period)
• Soft-Start Functionality
• Undervoltage Lockout (UVLO)
• Fast 10 μs Short-Circuit Response Time
(Non-Kickstart Options)
• Fault Status Output Flag
• Logic Controlled Enable (Active-High, Active-Low)
• Thermal Shutdown
• Pin Compatible with MIC2009/MIC2019
• 6-Pin 2 mm x 2 mm UDFN and 6-Pin SOT-23 Packages
• Junction Temperature Range from –40°C to+125°C

Applications
• USB Peripherals and USB 2.0/3.0-Compatible
• DTV/STB
• Notebooks and Consumer Electronics
• General Purpose Power Distribution