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MAX16948

更新时间： 2024-11-05 07:15:47
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美信 - MAXIM 开关
页数 文件大小 规格书
15页 1765K
描述
Automotive Dual Remote Antenna Current-Sense LDO/Switch

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MAX16948 数据手册

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19-6054; Rev 1; 4/12  
E V A L U A T I O N K I T A V A I L A B L E  
General Description  
Features  
The MAX16948 is a dual high-voltage, current-sensing low  
dropout linear regulator (LDO)/switch designed to operate  
with an input voltage range from 4.5V to 28V (45V load  
dump tolerant). The device provides phantom power over  
coax cable to remote radio frequency low-noise amplifiers  
(LNAs) in automotive systems with a maximum current of  
300mA per channel. The device also provides a fixed regu-  
lated output voltage of 8.5V or an adjustable 1V to 12.5V out-  
put voltage. The device can also be configured as a switch.  
S 2-Channel LDO/Switch with Precision-Adjustable  
Current-Sense (Up to 300mA Per Channel)  
S Wide Input Voltage Range: 4.5V to 28V (45V Load  
Dump Tolerant)  
S On/Off Switching or Regulation of Phantom Power  
Under µC Control  
S Reverse Current Protection  
S Output Short-to-Battery Protection  
The device monitors the load current and provides an ana-  
log output current proportional to the sensed load current.  
Accurate internal current limits protect the input supply  
against both overcurrent and short-circuit conditions. The  
device features an open-drain error output for each channel to  
indicate to the microcontroller (FC) when a fault has occurred.  
S Load Current Monitoring to Detect Open-Load/  
Normal/Short-Circuit Conditions  
S Open-Drain Error Status Signaling to µC  
S Input Overvoltage Shutdown  
S High Power-Supply Rejection Ratio (73dB)  
The device features short-to-battery protection to latch off the  
internal LDO/switch during a short-to-battery event. During a  
thermal overload, the device reduces power dissipation by  
going into thermal shutdown. It includes two independent  
active-low, high-voltage-compatible shutdown inputs to  
place each channel in a low-power shutdown mode.  
Applications  
Remote LNA Phantom Power  
Automotive Camera and Sensor Power  
Ordering Information appears at end of data sheet.  
The device is available in a 16-pin TQFN package with  
exposed pad, a 16-pin QSOP package with exposed  
pad, or a 16-pin QSOP package and is fully specified  
over the -40NC to +105NC temperature range.  
For related parts and recommended products to use with this part,  
refer to www.maxim-ic.com/MAX16948.related.  
Typical Operating Circuits  
BATTERY INPUT  
D
IN  
C
C
IN2  
IN1  
CABLE  
µC SUPPLY  
L
1
L
LOAD1  
OUT1  
IN  
OUT1  
R
PU1  
R
PU2  
C
OUT1  
D
OUT1  
R1  
1
C
R
LOAD1  
LOAD1  
ERR1  
ERROR FLAGS  
FB1  
ERR2  
REG  
R2  
1
C
REG  
MAX16948  
LIM1  
SENSE1  
SENSE2  
C
R
LIM2  
LIM1  
C
C
R
R
SENSE1  
SENSE1  
SENSE2  
CURRENT-SENSE  
OUTPUTS TO ADC  
CABLE  
L
2
L
LOAD2  
OUT2  
OUT2  
FB2  
C
OUT2  
D
OUT2  
R1  
R2  
C
R
LOAD2  
2
LOAD2  
SENSE2  
2
SHDN1  
SHDN2  
OFF ON  
LIM2  
GND  
C
R
LIM2  
LIM2  
Typical Operating Circuits continued at end of data sheet.  
����������������������������������������������������������������� Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  
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