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

Typical Operating Circuits

19-6054; Rev 2; 5/13

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.

EVALUATION KIT AVAILABLE

MAX16948

FB1

ERR1

LIM1

BATTERY INPUT

µC SUPPLY

ERROR FLAGS

CURRENT-SENSE

OUTPUTS TO ADC

OUT1

IN

GND

SENSE1

SENSE2

ERR2

SHDN1

OFF ON

SHDN2

REG

FB2

LIM2

OUT2

Typical Operating Circuits continued at end of data sheet.

For pricing, delivery, and ordering information, please contact Maxim Direct at

1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.