MAX16948：Automotive Dual Remote Antenna Current-Sense LDO/Switch

Dual Antenna Phantom Supply Provides Diagnostics for Multiband Antenna Systems

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 (µC) 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 -40°C to +105°C temperature range.

Key Features

2-Channel LDO/Switch with Precision-Adjustable Current-Sense (Up to 300mA Per Channel)
Wide Input Voltage Range: 4.5V to 28V (45V Load Dump Tolerant)
On/Off Switching or Regulation of Phantom Power Under µC Control
Reverse Current Protection
Output Short-to-Battery Protection
Load Current Monitoring to Detect Open-Load/Normal/Short-Circuit Conditions
Open-Drain Error Status Signaling to µC
Input Overvoltage Shutdown
High Power-Supply Rejection Ratio (73dB)

MAX16948: Typical Operating Circuit

Applications/Uses

Automotive Camera and Sensor Power
Remote LNA Phantom Power

DataSheet

title	Download file
MAX16948 Data Sheet	MAX16948.pdf

Parametrics

Part Number	Power Switches	Current Limit (mA)	Fault Indicator	Current Limit Accuracy (%)	Current Limit Set By	R_ON (Ω)	V_SUPPLY (V)	V_SUPPLY (V)	Oper. Temp. (°C)	Package/Pins	Budgetary Price
Part Number	Power Switches	max	Fault Indicator	Current Limit Accuracy (%)	Current Limit Set By	typ	min	max	Oper. Temp. (°C)	Package/Pins	See Notes
MAX16948	2	300	Yes	10	Resistor	1.45	4.5	28	-40 to +105	QSOP-EP/16 QSOP/16 TQFN/16	$3.38 @1k

Design kits & evaluation modules

MAX16948EVKIT

Quality and Environmental Data

MAX16948.pdf

Ordering Information

Part Number	Status	Package	Temp	RoHS
MAX16948AGEE/V+	Active	QSOP-EP,;16 pin;30.9 mm²	-40°C to +105°C	Lead Free
MAX16948AGEE/V+T	Active	QSOP-EP,;16 pin;30.9 mm²	-40°C to +105°C	Lead Free
MAX16948AGTE/V+	Active	TQFN,;16 pin;16.8 mm²	-40°C to +105°C	Lead Free
MAX16948AGTE/V+CET	Active	TQFN,;16 pin;16.8 mm²	-40°C to +105°C	Lead Free
MAX16948AGTE/V+T	Active	TQFN,;16 pin;16.8 mm²	-40°C to +105°C	Lead Free
MAX16948BGEE/V+	Active	QSOP,;16 pin;30.9 mm²	-40°C to +105°C	Lead Free
MAX16948BGEE/V+T	No Longer Available	QSOP,;16 pin;30.9 mm²	-40°C to +105°C	Lead Free