Micrel MIC2039 Manual

General Description

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 switch features an adjustable output current
limit that is resistor programmable from 0.2A to 2.5A. The
MIC2039 switch also offers a unique Kickstart feature,
which allows momentary high-current surges up to the
secondary current limit (I
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 offered in both 6-pin SOT-23 and 6-pin
2mm x 2mm thin DFN packages. It has an operating
junction temperature range of −40°C to +125°C.

Requirements

The MIC2039 evaluation board requires a single power
supply to provide V . The V
IN
to deliver a minimum of 2.5V and more than 1.5A
capability. The output load can either be active or passive.

Precautions

The evaluation board does not have reverse polarity
protection. Applying a negative voltage to the V
can damage the device. In addition, the maximum V
operating voltage of the MIC2039 evaluation board is 5.5V.
Exceeding 5.5V on V
IN
device.
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October 2012
) during startup or while
LIMIT_2nd
power supply must be able
IN
IN
can permanently damage the
High-Accuracy, High-Side, Adjustable
Current Limit Power Switch

Getting Started

1. Connect an external supply to V
Apply the desired input voltage to the V
terminals of the evaluation board, paying careful
attention to polarity and supply voltage. The user can
place an ammeter between the input supply and the
V terminal to the evaluation board. Make sure that
IN
the supply voltage is monitored at the V
ammeter and/or power lead resistance can reduce the
voltage supplied to the input.
2. Connect the load to the V
The load can be either passive (resistive) or active (as
in an electronic load). The user can place an ammeter
between the load and the V
that the output voltage is monitored at the V
terminal.
3. Enable the switch.
The MIC2039 evaluation boards are configured for
default enable using a 10kΩ pull-up resistor from the
ENABLE pin to VIN. To disable the switch, place a
jumper short across the jumper pins at TP2.
4. Fault detection
The MIC2039 is equipped with an error flag pin,
FAULT/. TP3 is provided to monitor the FAULT/ pin.

Ordering Information

Part Number
MIC2039-05AYM6 EV
terminal
IN
MIC2039-1AYM6 EV
MIC2039-05AYMT EV
MIC2039-1AYMT EV
MIC2039
Evaluation Board
and ground terminals.
OUT
OUT
Description
Evaluation board featuring the
MIC2039AYM6 Power Switch
Current limit is set for 500mA
Evaluation board featuring the
MIC2039AYM6 Power Switch
Current limit is set for 1A
Evaluation board featuring the
MIC2039AYMT Power Switch
Current limit is set for 500mA
Evaluation board featuring the
MIC2039AYMT Power Switch
Current limit is set for 1A
http://www.micrel.com
terminal.
IN
and ground
IN
terminal. The
IN
terminal. Make sure
OUT
M9999-100112-A