1. Products
  2. Power Monitor, Control, and Protection
  3. Current Limit Switches
  4. MAX16946


Features and Benefits

  • 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

Product Details

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.


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

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
MAX16946GEE/V+ Material Declaration Reliability Data 16-QSOP-150_MIL
MAX16946GEE/V+T Material Declaration Reliability Data 16-QSOP-150_MIL
MAX16946GTE/V+ Material Declaration Reliability Data 16-LFCSP-4X4X0.75
MAX16946GTE/V+T Material Declaration Reliability Data 16-LFCSP-4X4X0.75
Wafer Fabrication Data

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.