Diodes Incorporated

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Precision Adjustable Current-Limit Power Switches

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The AP22654Q and AP22655Q are single channel precision adjustable current-limit switches optimized for applications that require precision current limiting, or to provide up to 3.1A of continuous load current during heavy loads/short circuits. These devices offer a pin-strapped current-limit threshold between 0.4A and 3.56A (typ) via an external resistor. Current limit accuracy ±12% can be achieved at high current limit settings. The rise and fall times are controlled to minimize current surges during turn on/off.

The devices have fast short-circuit response time for improved overall system robustness. They provide a complete protection solution for applications subject to heavy capacitive loads and the prospect of short circuit, offering reverse current blocking and limiting, overcurrent, overtemperature and short-circuit protections, as well as controlled rise time and undervoltage lockout functionality. A 7ms deglitch capability on the open-drain Flag output prevents false overcurrent reporting and does not require any external components.

AP22654Q and AP22655Q limit the output current to a safe level when the output current exceeds current-limit threshold.

Both devices are available in TSOT26 (Type A1) package.


  • AEC Qualified to AEC-Q100 Grade 1 Offering -40°C to +125°C Ambient Operating Temperature Range
  • Up to 3.1A Maximum Load Current
  • Accurate Adjustable Current Limit, 0.4A to 3.56A
  • ±12% Accurate Adjustable Current Limit, 1.0A with RLIM = 6.8kΩ
  • Constant Current During Overcurrent
  • Fast Short-Circuit Response Time: 5µs (typ)
  • Reverse Current Blocking During Shutdown and Reverse Current Limiting During Enable
  • Operating Range: 3.0V to 5.5V
  • Built-in Soft-Start with 1.0ms Typical Rise Time
  • Overcurrent, Reverse Output Current/Voltage and Thermal Protection
  • Fault Report (FAULT) with Blanking Time
  • ESD Protection: 2kV HBM, 1.5kV CDM
  • Active Low (AP22654Q) or Active High (AP22655Q) Enabled
  • TSOT26 (Type A1) Package: Available in “Green” Molding Compound (No Br, Sb)
  • 15kV ESD Protection per IEC 61000-4-2 (With Ext. Capacitance)
  • UL Recognized, File Number E322375, Vol. 1
  • IEC62368-1 CB Scheme Certified
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • The AP22654Q and AP22655Q are suitable for automotive applications requiring specific change control; these parts are AEC-Q100 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities. https://www.diodes.com/quality/product-definitions/


  • Automotive ECU supply rail power distribution and switching
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Product Specifications

Product Parameters

Compliance (Only Automotive supports PPAP) Automotive
Maximum Continuous Output Current (A) 3.1
(MAX) Maximum Current Limit Fixed (A) 3.5
Channels 1
Enable Logic Active Low
Minimum Operating Voltage (V) 3
Maximum Operating Voltage (V) 5.5
Quiescent Current Typ (µA) 90
RDS(ON) (VIN = 5V) Typ (mΩ) 50
Reverse Current Block Yes
Output Discharge Yes
(TYP) Output Rise Time mS 1
OCP Output Latch Off No
OCP Flag Yes
Power Good No
Operating Ambient Temperature Range (°C) -40 to 85
UL Certificate Yes

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