Adjustable Current-Limit Switch with Low Power Mode

Extended 0perating Range Up to 22V with Adjustable Current-Limit Modes Provides a Highly Versatile Solution

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The MAX20333/A/B/C/D/E/F/G/H/I/J/K programmable current-limit switches feature internal current limiting to prevent damage to host devices due to faulty load conditions. These current limit switches feature a low 23mΩ (typ) on-resistance and operate from a +3.5V to +22V input voltage range.

The MAX20333 family has three working modes: normal mode (NM), high current mode (HCM), and low power mode (LPM). In NM, the device offers a programmable current-limit protection from 0.2A to 4.75A. The current-limit threshold can be programmed by connecting a suitable resistor to the SETI bump. When the current reaches the programmed threshold, the part prevents the current to further increase. The device can react in three different ways while in current limit: autoretry, latchoff, and continuous. The voltage on the SETI bump is proportional to the current flowing out of the OUT bump at any time and can be read by an ADC.

In high current mode (HCM), the current-limit threshold is multiplied by two, with an internal upper limit set at 5.5A. The voltage on SETI is proportional to the current flowing into IN, but multiplied by a factor 0.5. In low power mode (LPM), the current consumption of the part is dramatically reduced, and the on-resistance is 420mΩ (typ), while still offering an overcurrent protection. The switch is open when the current flowing through the switch exceeds 0.4A (typ).

The devices are available in a 15-bump (2.1mm x 1.52mm) WLP package and operate over the -40°C to +85°C extended temperature range.

MAX20333, MAX20333A: Typical Application Circuit MAX20333, MAX20333A: Typical Application Circuit Enlarge+

Key Features

  • Flexible Operation
    • Wide Range of Programmable Current Limit (0.2A to 4.75A)
    • Wide Operating Range: 3.5V to 22V
    • Three Different Current-Limit Modes: NM, HCM, LPM
    • Three Different Current-Limit Behaviors: Autoretry, Latchoff, Continuous
    • Power Good Input
    • Current Monitoring
  • Safe Operation
    • Precision Current Limit
    • Output Short Protection
    • Thermal Protection
    • Flag Output
  • UL 2367 Recognized–File No. E211395
    • MAX20333/A/F/G Only
    • 4.9A/100W Maximum
  • Power Savings
    • Low Power Mode (LPM) with Output Short Protection


  • Battery Disconnect Switch
  • General Power Supply Switch
  • USB Port Protection Switch

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

Part NumberUSBPower SwitchesCurrent Limit
Current Limit
Fault IndicatorCurrent Limit Accuracy
Current Limit Set ByLowest Adj. Setting
Oper. Temp.
minmaxtypminmaxSee Notes
MAX20333 Yes12005500Yes7Resistor0.20.0233.522-40 to +85
$0.90 @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.

MAX20333EVKIT: Evaluation Kit for the MAX20333, MAX2033A, MAX20333B, MAX20333C, MAX20333D, MAX20333E, MAX20333F, MAX20333G, MAX20333H, MAX20333I, MAX20333J, MAX20333K
Request Reliability Report for: MAX20333A 
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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