Diodes Incorporated
SO 8

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AP3790 (Obsolete)

Pump Express Compatible AC-DC PSR Controller

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The AP3790 is a high accuracy and low cost switching mode power
supply controller to drive power bipolar transistor for battery
charger/adapter applications. The controller regulates the output
voltage and current in the primary side by piece-wise Pulse
Frequency Modulation (p-PFM) in discontinuous conduction mode
(DCM). The controller uses adaptive source current to optimize
driving current to reduce driving loss. The system operating frequency
reduces linearly from heavy load to light load in each interval of the p-
PFM, and enters constant current mode when the load current is
equal to the maximum system output current.
The output voltage of AP3790 can be adjusted based on the patterns
of load current aligned to MTK Pump Express protocol.
The AP3790 provides operating frequency Jitter function from light to
full load range to improve the power supply EMI performance. The
AP3790 also has built-in fixed cable voltage drop compensation (6%
of nominal system output voltage) and adjustable line voltage
The AP3790 can work individually to achieve Ultra-Low standby
power under 5V output.
The AP3790 is packaged in SO-8.


  • Compatible to MediaTek Pump ExpressTM Protocol
  • Ultra-Low Standby Power Consumption
  • Valley-Turn On to Reduce Switching Loss and Benefit for EMI
  • Piece-wise Frequency Reduction to Enhance Conversion Efficiency and Suppress Audio Noise
  • ±5% Constant Voltage Accuracy for 5V Output
  • Audio Noise Suppression
  • Open Circuit Protection (OCkP)
  • Current Sense Resistor Short Protection
  • Over Voltage Protection (OVP)
  • Over Temperature Protection (OTP)
  • Short Circuit Protection (SCP) with Hiccup
  • Totally Lead-free & Fully RoHS Compliant 
  • Halogen and Antimony Free. “Green” Device


  • Adapters/Chargers

Product Specifications

Product Parameters

CableCompensation Yes
OperatingCurrent (µA) 500
StandbyPower (Max) (mW) 75
StartupCurrent (µA) 0.2
UVLOThresholdon/off (V) 15.5
VCC Maximum Rating 35

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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-2519 2021-05-20 2021-11-20 Device End of Life (EOL)