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| 型号： | MAX1614EUA |
| 厂商： | Maxim Integrated |
| 文件页数： | 5/9页 |
| 文件大小： | 0K |
| 描述： | IC DRIVER SW MOSF HI SIDE 8UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 配置： | 高端 |
| 输入类型： | 非反相 |
| 配置数： | 1 |
| 输出数： | 1 |
| 电源电压： | 5 V ~ 26 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-uMAX |
| 包装： | 管件 |
MAX1614
High-Side, n-Channel MOSFET
Switch Driver
______________________________________________________________Pin Description
PIN
1
2
3
4
5
6
7
8
NAME
ON
OFF
LBO
LBI
GND
GATE
SRC
BATT
FUNCTION
SET Input to the On/Off Latch. Pulse ON low with OFF high to turn on the external MOSFET switch. When
both ON and OFF are low, the part is off.
RESET Input to the On/Off Latch. Pulse OFF low with ON high to turn off the external MOSFET switch. When
both ON and OFF are low, the part is off.
Open-Drain, Low-Battery Comparator Output. LBO is low when V LBI is below the trip point.
Low-Battery Comparator Input. LBO goes low when V LBI falls below 1.20V (typ). Connect a voltage divider
between BATT, LBI, and GND to set the battery undervoltage trip threshold (see Typical Operating Circuit).
System Ground
Gate-Drive Output. Connect to the gates of external, n-channel MOSFETs. When the MAX1614 is off, GATE
actively pulls to GND.
Source Input. Connect to the sources of external, n-channel MOSFETs. When the MAX1614 is off, SRC
actively pulls to GND.
Battery Input. Connect to a battery voltage between 5V and 26V.
_______________Detailed Description
The MAX1614 uses an internal, monolithic charge pump
and low-dropout linear regulator to supply the required
8V V GS voltage to fully enhance an n-channel MOSFET
high-side switch (Figure 1). The charge pump typically
supplies 30μA, charging 800pF of gate capacitance in
400μs (V BATT = 15V). For slower turn-on times, simply
add a small capacitor between the GATE and SRC
pins. When turned off, GATE and SRC pull low and typi-
cally discharge an 800pF gate capacitance in 80μs.
The MAX1614 provides separate on/off control inputs
( ON and OFF ). ON and OFF connect, respectively, to
the SET and RESET inputs of an internal flip-flop. When
ON is pulsed low (with OFF = high), the internal charge
pump turns on, and GATE is pumped to 8V above SRC,
turning on the external MOSFETs. The charge pump
maintains gate drive to the external MOSFETs until OFF
is pulsed low. When this happens, the internal charge
pump turns off, and GATE discharges to ground
through an internal switch. For slower turn-on times,
simply add a small capacitor.
__________ Applications Information
Connecting ON / OFF to 3V or 5V Logic
ON and OFF internally connect to 2μA max pullup
current sources (Figure 1). The open-circuit voltage
for ON and OFF ranges from 7V to 10.5V (nominally
8.5V). Since the current sources are relatively weak,
connecting ON and OFF directly to logic powered from
Maxim Integrated
lower voltages (e.g., 3V or 5V) poses no problem if the
gate outputs driving these pins can sink at least 2μA
while high.
Although the MAX1614 shutdown function was designed
to operate with a single pushbutton on/off switch, it can
also be driven by a single gate. Connect ON to GND
and drive OFF directly (Figure 2).
Maximum Switching Rate
The MAX1614 is not intended for fast switching appli-
cations. In fact, it is specifically designed to limit the
rate of change of the load current, ? I/ ? t. The maximum
switching rate is limited by the turn-on time, which is a
function of the charge-pump output current and the
total capacitance on GATE (C GATE ). Calculate the turn-
on time as a function of external MOSFET gate capaci-
tance using the Gate Charging Current vs. V BATT graph
in the Typical Operating Characteristics. Since turn-off
time is small compared to turn-on time, the maximum
switching rate is approximately 1/t ON .
Adding Gate Capacitance
The charge pump uses an internal monolithic transfer
capacitor to charge the external MOSFET gates.
Normally, the external MOSFET’s gate capacitance is
sufficient to serve as a reservoir capacitor. If the
MOSFETs are located at a significant distance from the
MAX1614, place a local bypass capacitor (100pF typ)
across the GATE and SRC pins. For slower turn-on
times, simply add a small capacitor between GATE and
SRC.
5
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相关代理商/技术参数 |
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| MAX1614EUA/V+ | 功能描述:功率驱动器IC High-Side N-Channel MOSFET Switch 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 |
| MAX1614EUA/V+T | 功能描述:功率驱动器IC High-Side N-Channel MOSFET Switch 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 |
| MAX1614EUA+ | 功能描述:功率驱动器IC High-Side NCh Switch 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 |
| MAX1614EUA+T | 功能描述:功率驱动器IC High-Side NCh Switch 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 |
| MAX1614EUA-T | 功能描述:功率驱动器IC 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 |
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