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 regulated output voltage of 8.5V or an adjustable 1V to 12.5V output voltage. The device can also be configured as a switch. The device monitors the load current and provides an analog 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.maximintegrated.com/MAX16948.related. Typical Operating Circuits
BATTERY INPUT DIN µC SUPPLY RPU1 ERROR FLAGS RPU2 ERR1 ERR2 REG CREG SENSE1 RSENSE1 CSENSE1 CIN1 CIN2 LOUT1 OUT1 R11 FB1 R21 COUT1 DOUT1 CLOAD1 RLOAD1 CABLE1 LLOAD1 IN MAX16948
LIM1 CLIM1 RLIM2 LOUT2 SENSE2 OUT2 R12 FB2 R22 COUT2 DOUT2 CLOAD2 RLOAD2 CABLE2 LLOAD2 CURRENT-SENSE OUTPUTS TO ADC RSENSE2 CSENSE2 OFF …
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