Remote Antenna, Current-Sense and LDO/Switches

Fault Protection and Diagnostics for Automotive Antenna and Remote Modules

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The MAX16946/MAX16947 high-voltage, high-side, current-sense LDO/switches feature internal current limiting to prevent system damage due to fault conditions. The MAX16946 provides a fixed regulated 8.5V output voltage or an adjustable 3.3V to 15V output voltage. The MAX16946 can also be configured as a switch, while the MAX16947 is only available as a switch. The input voltage range for both devices extends from 4.5V to 18V (45V tolerant), making the devices ideal for providing phantom power to remote radio-frequency low-noise amplifiers (LNAs) in automotive applications.

The devices monitor the load current and provide an analog output voltage proportional to the sensed load current. Accurate internal current limit protects the input supply against both overload and short-circuit conditions. Two open-drain fault indicator outputs indicate to the microprocessor when a short circuit, an open-load condition, or a short-to-battery condition exists. An overtemperature shutdown is also indicated by means of the current-sense amplifier's output voltage.

A fault-blanking feature allows the devices to ignore momentary faults such as those caused by the charging of capacitive loads during hot-swapping, preventing false alarms to the system. The devices feature short-to-battery protection to latch off the internal LDO/pass switch during a short-to-battery event. During a thermal overload, the devices reduce power dissipation by going into thermal shutdown. They include an active-low, high-voltage-compatible shutdown input to place them in low-power shutdown mode.

The MAX16946 is available in thermally enhanced, 16-pin TQFN-EP and QSOP-EP packages. The MAX16947 is available in a 16-pin QSOP package. Both devices operate over the -40°C to +105°C temperature range.
MAX16946, MAX16947: Functional Diagram MAX16946, MAX16947: Functional Diagram Enlarge+

Key Features

  • Switch Phantom Power-On/-Off Under µC Control
  • Precision Adjustable Current Limit
    • 300mA (max), TA = +105°C
    • 500mA (max), TA = +85°C (MAX16946 in SW Mode Only)
  • Regulated Output Voltage (MAX16946)—8.5V Fixed or Adjustable Between 3.3V and 15V
  • Current Measurement Analog Voltage Output
  • Detect Open-Load and Short-Circuit Conditions
  • Provide Open-Drain Fault Signals (Active-Low SC and Active-Low OL)
  • Overcurrent Blanking During Startup
  • Thermal Shutdown
  • AEC-Q100 Qualified
  • -40°C to +105°C Operating Temperature Range


  • Automotive Remote Module Power
  • Automotive Safety and Infotainment
  • Remote LNA Phantom Power

See parametric specs for Current Limit and USB Power Switches (80)

Part NumberPower SwitchesCurrent Limit
Current Limit
Fault IndicatorCurrent Limit Set ByLowest Adj. Setting
Oper. Temp.
minmaxminmaxSee Notes
MAX16946 1300500YesResistor0.34.518-40 to +105
$1.76 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX16946EVKIT: Evaluation Kit for the MAX16946
Request Reliability Report for: MAX16947 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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