3A High-Side Load Switch
with Reverse Blocking
MIC94161/2/3/4/5 Evaluation Board
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
October 4, 2013
Revision 1.0
General Description
The MIC94161/2/3/4/5 is a family of high-side load
switches designed to operate from 1.7V to 5.5V input
voltage. The load switch pass element is an internal
14.5mΩ R
DSON
N-Channel MOSFET which enables the
device to support up to 3A of continuous current.
Additionally, the load switch supports 1.5V logic level
control and shutdown features in a tiny 1.5mm × 1mm
6-ball WLCSP package.
The MIC9416x provides reverse current protection when
the device is disabled. The device will not allow the flow of
current from the output to the input when the device is
turned OFF. Additionally, the MIC94161 features
overvoltage protection to protect the load when the input
voltage is above 4.55V, as well as a precise enable
threshold which keeps the MIC94161 in the default OFF
state until the EN pin rises above 1.15V.
An input capacitor may be required when the power supply
is more than 4-inches away from the device. The
evaluation board includes an input capacitor of 10µF to
compensate for long inductive test leads.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com
.
Requirements
The MIC94161/2/3/4/5 evaluation board requires an input
power source that is able to deliver at least 3A at a voltage
within the range of 1.7V to 5.5V. The output load can be
either active or passive.
Precautions
The evaluation board does not have reverse polarity
protection. Applying a negative voltage to the V
IN
terminal
may damage the device.
The evaluation board is tailored for a Li-Ion range input
supply voltage. It should not exceed 5.5V on the input.
Getting Started
1. Connect an external supply to V
IN
.
Apply the desired input voltage to the V
IN
(J3) and
ground terminal (J6) of the evaluation board, paying
careful attention to polarity and supply voltage (1.7V ≤
V
IN
≤ 5.5V). An ammeter may be placed between the
input supply and the V
IN
terminal to the evaluation
board to accurately monitor the input current. The
ammeter and power lead resistance can reduce the
voltage supplied to the input so monitor the supply
voltage at the V
IN
terminal.
2. Enable/Disable the MIC94161/2/3/4/5.
The MIC9416x family of high side switches, have an
internal 2MΩ pull down resistor to GND on the enable
pin to disable the device when an enable signal is not
present. To enable an output simply jumper the EN
terminal (J5) to VIN (J3) or apply an Active-high
CMOS compatible logic to (J3).
3. Connect the load to the VOUT terminal (J4) and
ground terminal (J7).
The load can be either a passive (resistor) or active
(electronic load). Be sure to monitor the output voltage
at the V
OUT
(J4) terminals.
Ordering Information
Part Number Description
MIC94161YCS EVB
Evaluation board with 3A High-Side
switch, 2.7ms turn on, and OVP.
MIC94162YCS EVB
Evaluation board with 3A High-Side
switch, 60µs turn on, and auto
discharge.
MIC94163YCS EVB
Evaluation board with 3A High-Side
switch and 60µs turn on.
MIC94164YCS EVB
Evaluation board with 3A High-Side
switch, 2.7ms turn on, and auto
discharge.
MIC94165YCS EVB
Evaluation board with 3A High-Side
switch and 2.7ms turn on.
