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MIC5019_EB

更新时间: 2024-11-06 12:25:47
品牌 Logo 应用领域
麦瑞 - MICREL 驱动器
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5页 271K
描述
Ultra-Small High-Side N-Channel MOSFET Driver with Integrated Charge Pump

MIC5019_EB 数据手册

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MIC5019 Evaluation Board  
Ultra-Small High-Side N-Channel MOSFET Driver  
with Integrated Charge Pump  
General Description  
Getting Started  
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.  
1. VDD Supply  
Connect a supply to the VDD and GND terminals,  
paying careful attention to the polarity and the supply  
range (2.7V < VIN < 9V). Monitor IIN with a current  
meter and VIN at VDD and GND terminals with a  
voltmeter. Do not apply power until step 4.  
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.  
2. Connect Function Generator to IN pin  
Connect the function generator output to the IN pin  
and GND.  
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.  
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  
Data sheets and support documentation can be found  
on Micrel’s web site at: www.micrel.com.  
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:  
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 VDD of the board is rated at 10V. Exceeding  
10V on the VDD could damage the device.  
VOUT = 4 × VDD – 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  
Description  
MIC5019YFT EV  
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  
M9999-082212-A  
hbwhelp@micrel.com or (408) 955-1690  
August 2012  

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