MIC5019 Evaluation Board
Ultra-Small High-Side N-Channel MOSFET Driver
with Integrated Charge Pump
General Description
The MIC5019 is a high-side MOSFET driver with
integrated charge pump designed to switch an N-
channel enhancement type MOSFET in high-side or
low–side applications.
The MIC5019 operates from a 2.7V to 9V supply. It
generates gate voltages of 9.2V from a 3V supply and
16V from a 9V supply. The device consumes a low
77µA of supply current and less than 1µA of supply
current in shutdown mode.
In high-side configurations, the source voltage of the
MOSFET approaches the supply voltage when
switched on. To keep the MOSFET on, the MIC5019’s
output drives the MOSFET gate voltage higher than
the supply voltage.
Data sheets and support documentation can be found
on Micrel’s web site at:
www.micrel.com.
Requirements
The MIC5019 evaluation board needs only a single
power supply to power the driver and a function
generator or logic signal to drive the IN pin. If the
application needs different supplies for driver and
load, then another supply may be used to power the
external MOSFET at the VEXT (J7 and J6) by loading
the resistor R1 and cutting the traces indicated by R4.
Precautions
The MIC5019 evaluation board does not have reverse
polarity protection. Applying a negative voltage to the
VDD and GND terminals may damage the device. The
maximum V
DD
of the board is rated at 10V. Exceeding
10V on the VDD could damage the device.
Getting Started
1. V
DD
Supply
Connect a supply to the VDD and GND terminals,
paying careful attention to the polarity and the supply
range (2.7V < V
IN
< 9V). Monitor I
IN
with a current
meter and V
IN
at VDD and GND terminals with a
voltmeter. Do not apply power until step 4.
2. Connect Function Generator to IN pin
Connect the function generator output to the IN pin
and GND.
3. OUT Signal
The voltage on the OUT pin can be monitored by
using either a voltmeter or a high-impedance scope
probe.
4. Turn on the Power
Turn on the VDD supply, apply a logic high signal to
the IN pin, and verify the OUT signal. The OUT pin is
supplied by an internal charge pump; the charge
pump is enabled when IN is logic high. The charge
pump consists of an oscillator and a voltage
quadrupler (4×). The oscillator operates from 70kHz to
100kHz, depending on the supply voltage and
temperature. The output voltage is limited to 16V,
typically by an internal zener diode clamp. The charge
pump output voltage is approximately:
V
OUT
= 4 × V
DD
– 2.8V, but not exceeding 19Vmax.
Refer to the “Output Voltage vs. Supply Voltage”
graph in the “Typical Characteristics” section.
The user has a flexibility of either soldering a FET
(Q1) or using different values of capacitors to imitate
the gate capacitance (C5).
Ordering Information
Part Number
MIC5019YFT EV
Description
MIC5019 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
August 2012
M9999-082212-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
MIC5019 Evaluation Board
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB
http://www.micrel.com
Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This
information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry,
specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual
property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no
liability whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or
warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a
product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for
surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury
to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and
Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale.
© 2012 Micrel, Incorporated.
August 2012
5
M9999-082212-A
hbwhelp@micrel.com
or (408) 955-1690
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