Diodes Incorporated

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Precision-adjustable Current-limited Power Switches

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The AP22653Q is single-channel, precision-adjustable, current-limited switch optimized for applications that require precision current-limiting, or to provide up to 1.5A of continuous load current during heavy loads/short circuits. This device offers a programmable current-limit threshold between 125mA and 1735mA (typ) via an external resistor. Current-limit accuracy ±7% can be achieved at high current-limit settings. The rise and fall times are controlled to minimize current surges during turn on/off.

The device has fast short-circuit response time for improved overall system robustness. The device provides 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 protection, as well as controlled rise-time and undervoltage lockout functionality. A 6ms deglitch capability on the open-drain flag output prevents false overcurrent reporting and does not require any external components.

The AP22653Q limits the output current to a safe level when the output current exceeds current-limit threshold. The device is available in the SOT26 (Type A1) package.


  • Up to 1.5A Maximum Load Current
  • Accurate Adjustable Current-Limit, 125mA to 1735mA
  • ±7% Accurate Adjustable Current-Limit, 1.735A with RLIM = 15kΩ
  • Constant-Current Version
  • 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 0.5ms Typical Rise Time
  • Over-Current, Output Over-Voltage and Thermal Protection
  • Fault Report (FAULT) with Blanking Time
  • ESD Protection: 2kV HBM, 750V CDM
  • Enable Active High
  • SOT26 Package: Available in “Green” Molding Compound (No Br,Sb)
  • 16kV ESD Protection per IEC61000-4-2 (With External Capacitance)
  • UL Recognized.
  • IEC60950-1 CB Scheme Certified
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature Range
    • Device HBM ESD Classification Level H2
    • Device CDM ESD Classification Level C3B
  • Totally Lead-Free & Fully RoHS Compliant 
  • Halogen and Antimony Free. “Green” Device 
  • The AP22653Q is suitable for automotive applications
    requiring specific change control; this part is AEC-Q100
    qualified, PPAP capable, and manufactured in IATF 16949
    certified facilities.


  • Laptops
  • USB Ports/Hubs
  • Automotive ECU Supply Rail Power Distribution and Switching
  • Automotive ECU Supply Rail Precision Current-Limiting

Product Specifications

Product Parameters

Type OCP Switch
AEC Qualified Yes
Compliance (Only Automotive supports PPAP) Automotive
Maximum Continuous Output Current (A) 1.5
(MAX) Maximum Current Limit Fixed (A) 1.856
Adjustable Current Limit No
Channels 1
Enable Logic Active High
Minimum Operating Voltage (V) 3
Maximum Operating Voltage (V) 5.5
Quiescent Current Typ (µA) 120
RDS(ON) (VIN = 5V) Typ (mΩ) 55
Minimum Power Supply Voltage (V) 3
Maximum Power Supply Voltage (V) 5.5
Output Discharge Yes
(TYP) Output Rise Time mS 0.5
OCP Output Latch Off No
OCP Flag Yes
Power Good No
Operating Ambient Temperature Range (°C) -40 to 125
Overtemperature Protection Yes
UL Certificate Yes

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Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2675 2024-03-28 2024-03-28 Additional Wafer Source SPFAB


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