Micrel, Inc.
Functional Diagram
+2.7V to +9V
MIC5018
VS
D2
35V
Q1
I1
20 μ A
MIC5018
On
Off
CTL
R1 2k
D1
16V
Q2
R2
15k
EN CHARGE
PUMP
D3 16V
Q3
G
GND
Functional Diagram with External Components
(High-Side Driver Configuration)
Functional Description
Refer to the functional diagram.
The MIC5018 is a noninverting device. Applying a logic
high signal to CTL (control input) produces gate drive
output. The G (gate) output is used to turn on an
external N-channel MOSFET.
Supply
VS (supply) is rated for +2.7V to +9V. An external
capacitor is recommended to decouple noise.
Control
CTL (control) is a TTL compatible input. CTL must be
forced high or low by an external signal. A floating input
may cause unpredictable operation.
A high input turns on Q2, which sinks the output of
current source I1, making the input of the first inverter
low. The inverter output becomes high enabling the
charge pump.
Charge Pump
The charge pump is enabled when CTL is logic high.
The charge pump consists of an oscillator and voltage
quadrupler (4×). Output voltage is limited to 16V by a
zener diode. The charge pump output voltage will be
approximately:
V G = 4 × V SUPPLY – 2.8V, but not exceeding 16V
The oscillator operates from approximately 70kHz to
approximately 100kHz depending upon the supply
voltage and temperature.
Gate Output
The charge pump output is connected directly to the G
(gate) output. The charge pump is active only when CTL
is high. When CTL is low, Q3 is turned on by the second
inverter and discharges the gate of the external
MOSFET to force it off.
If CTL is high, and the voltage applied to VS drops to
zero, the gate output will be floating (unpredictable).
ESD Protection
D1 and D2 clamp positive and negative ESD voltages.
R1 isolates the gate of Q2 from sudden changes on the
CTL input. Q1 turns on if the emitter (CTL input) is
forced below ground to provide additional input
protection. Zener D3 also clamps ESD voltages for the
gate (G) output.
April 2006
5
M9999-042406
(408) 955-1690
相关PDF资料
MIC5020YM IC DRIVER MOSF LO SIDE HS 8-SOIC
MIC5021YN IC DRIVER MOSFET HI SIDE HS 8DIP
MIC5400BWM IC LED DRIVER RGB 28-SOIC
MKP1V240RL SIDAC BIDIR 0.9A 240V DO-41
MKP3V240RL SIDAC BIDIRECT 1A 240V DO-201AD
MKP9V160RL SIDAC BIDIR 0.9A 160V DO-41
MNC-8085 CABINET MEGA NETWORK 31X25X12"
MORPH-IC-II MODULE USB TO FPGA
相关代理商/技术参数
MIC5018YM4TR 制造商:Micrel 功能描述:MOSFET Driver 1-Out Hi Side Non-Inv
MIC5018YM4-TR 功能描述:IC DRIVER MOSFET HI SIDE SOT143 制造商:microchip technology 系列:IttyBitty? 包装:剪切带(CT) 零件状态:有效 驱动配置:高压侧 通道类型:单路 驱动器数:1 栅极类型:N 沟道 MOSFET 电压 - 电源:2.7 V ~ 9 V 逻辑电压?- VIL,VIH:0.8V,2.4V 电流 - 峰值输出(灌入,拉出):- 输入类型:非反相 高压侧电压 - 最大值(自举):- 上升/下降时间(典型值):- 工作温度:-40°C ~ 85°C(TA) 安装类型:表面贴装 封装/外壳:TO-253-4,TO-253AA 供应商器件封装:SOT-143 标准包装:1
MIC5019 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Ultra-Small High-Side N-Channel MOSFET Driver with Integrated Charge Pump
MIC5019_EB 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Ultra-Small High-Side N-Channel MOSFET Driver with Integrated Charge Pump
MIC5019YFT 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Ultra-Small High-Side N-Channel MOSFET Driver with Integrated Charge Pump
MIC5019YFT EV 功能描述:电源管理IC开发工具 Ultra-Small High Side MOSFET Driver - Evaluation Board RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V
MIC5019YFT T5 功能描述:功率驱动器IC Ultra-Small High Side MOSFET Driver RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube
MIC5019YFT TR 功能描述:功率驱动器IC Ultra-Small High Side MOSFET Driver RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube