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MAX16946/MAX16947
Remote Antenna, Current-Sense and
LDO/Switches
Pin Description (continued)
PIN
MAX16946 MAX16947
NAME
FUNCTION
12
13
12
13
REF
REG
+3V Nominal Reference Output. REF has a current drive capability of 100 F A.
Internal Regulator +5V Output. REG powers all internal blocks. Do no use REG to supply
power to external circuitry. Bypass REG to GND with a 1 F F capacitor.
Feedback Input (MAX16946 Only). Connect FB to GND to configure the MAX16946 as
14
—
FB
a switch. Connect FB to REG for an LDO with a fixed 8.5V output. Connect to the center
tap of an external resistive divider connected between OUT and GND to adjust the
output voltage of the LDO.
16
—
—
—
16
—
OUT
OUT
EP
Switch or LDO Output (MAX16946 Only). OUT is either a switch or LDO output
depending on the connection of FB.
Switch Output
Exposed Pad (MAX16946 Only). Connect EP to the ground plane for optimal heat
dissipation. Do not use EP as the only electrical ground connection.
Detailed Description
The MAX16946/MAX16947 high-voltage, high-side, cur-
rent-sense LDO/switches feature internal current limiting
to prevent system damage due to fault conditions. The
MAX16946 provides a regulated 8.5V output voltage
fixed or adjustable from 3.3V to 15V. The MAX16946 can
also be configured as a switch, while the MAX16947 is
only available as a switch. The input voltage range for
both devices extends from 4.5V to 18V (45V tolerant),
making the devices ideal for providing phantom power
to remote radio-frequency low-noise amplifiers (LNAs) in
automotive applications.
The devices monitor the load current and provide an
analog output voltage proportional to the sensed load
current. Accurate internal current-limit protects the input
supply against both overload and short-circuit condi-
tions. Two open-drain fault indicator outputs indicate to
the microprocessor when a short circuit, an open-load
condition, or a short-to-battery condition exists. An over-
temperature shutdown is also indicated by means of the
current-sense amplifier’s output voltage.
A fault-blanking feature allows the devices to ignore
momentary faults such as those caused by the charg-
ing of capacitive loads during hot-swapping, prevent-
ing false alarms to the system. The devices feature
short-to-battery protection to latch off the internal LDO/
pass switch during a short-to-battery event and thermal
Maxim Integrated
overload. They include an active-low, high-voltage-
compatible shutdown input to place them in low-power
shutdown mode.
Current-Sense Amplifier
The integrated current-sense amplifier employs a differ-
ential amplifier that amplifies the voltage between IN and
SENS. A sense resistor, R SENSE , is connected across IN
and SENS. Typical sense resistor values range between
0.25 I and 2 I . When the load current passes through
the sense resistor, a voltage drop develops across it.
The current-sense amplifier amplifies this voltage.
The current-sense amplifier features an internally fixed
gain of A V = 26V/V (typ). The following equations show
the relationship between the current-sense amplifier
output voltage (V AOUT ) and load current:
( V IN ? V SENS )( V ) = I LOAD ( A ) × R SENSE ( ? )
( ) V
V AOUT = A V ( V V ) × (V IN ? V SENS ) ( V ) + 0.4V
If LIM is connected to REF, the maximum output voltage
of AOUT is V AOUT_FS = 3V. If LIM is externally driven to
3.65V, the maximum output voltage of AOUT extends
to V AOUT_FS = 3.65V. The maximum AOUT voltage is
always equal to V LIM , the voltage at LIM.
AOUT is the output of an internal buffer with 1mA current
drive capability. Bypass AOUT to ground with a 15nF
ceramic capacitor.
11
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相关代理商/技术参数
MAX16946GEE/V+ 功能描述:电源开关 IC - 配电 Remote Antenna Current-Sense RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5
MAX16946GEE/V+T 功能描述:电源开关 IC - 配电 Remote Antenna Current-Sense RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5
MAX16946GTE/V+ 功能描述:电源开关 IC - 配电 Remote Antenna Current-Sense RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5
MAX16946GTE/V+T 功能描述:电源开关 IC - 配电 Remote Antenna Current-Sense RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5
MAX16946GUE/V+ 功能描述:电源开关 IC - 配电 Remote Antenna Current-Sense RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5
MAX16946GUE/V+T 功能描述:电源开关 IC - 配电 Remote Antenna Current-Sense RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5
MAX16947GEE/V+ 功能描述:电源开关 IC - 配电 Remote Antenna Current-Sense RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5
MAX16947GEE/V+T 功能描述:电源开关 IC - 配电 Remote Antenna Current-Sense RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5