MIC5019 Evaluation Board

Ultra-Small High-Side N-Channel MOSFET Driver

with Integrated Charge Pump

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

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

10V on the VDD could damage the device.

Getting Started

Connect a supply to the VDD and GND terminals,

paying careful attention to the polarity and the supply

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:

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

Description

MIC5019YFT EV

MIC5019 Evaluation Board