MIC5019_EB Datasheet, PDF (1/5 Pages) Micrel Semiconductor – Ultra-Small High-Side N-Channel MOSFET Driver with Integrated Charge Pump

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 [phone] • fax + 1 [phone] • http://www.micrel.com
August 2012
M9999-082212-A
[e-mail] or [phone]