MAX16948 Datasheet, PDF (1/15 Pages) Maxim Integrated Products – Automotive Dual Remote Antenna Current-Sense LDO/Switch

19-6054; Rev 1; 4/12
EVALUATION KIT AVAILABLE
MAX16948
Automotive Dual Remote Antenna
Current-Sense LDO/Switch
General Description
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.
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.
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.
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.
Features
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
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)
Applications
Remote LNA Phantom Power
Automotive Camera and Sensor Power
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part,
refer to www.maxim-ic.com/MAX16948.related.
Typical Operating Circuits
BATTERY INPUT
DIN
CIN1
CIN2
µC SUPPLY
RPU1
RPU2
ERROR FLAGS
CREG
RSENSE1
CURRENT-SENSE
OUTPUTS TO ADC
CSENSE1
RSENSE2 CSENSE2
IN
OUT1
ERR1
ERR2
FB1
REG
MAX16948
SENSE1
LIM1
SENSE2
OUT2
FB2
OFF ON
SHDN1
SHDN2
GND
LIM2
Typical Operating Circuits continued at end of data sheet.
LOUT1
CABLE1
LLOAD1
COUT1
DOUT1
R11
CLOAD1 RLOAD1
R21
CLIM1 RLIM2
LOUT2
COUT2
DOUT2
R12
CABLE2
LLOAD2
CLOAD2 RLOAD2
R22
CLIM2 RLIM2
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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.