Diodes Menu Close


Pump Express Compatible AC-DC PSR Controller

Contact Sales

Log in or register to manage email notifications about changes to datasheets or PCNs for this part.


The APS39903 is a high accuracy and low cost switching mode
power supply switcher for battery charger/adapter applications. It is
consists of a primary side regulation controller and a high voltage
transistor. 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 switcher 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 and output current limit of APS39903 can be
adjusted based on the patterns of load current aligned to MTK Pump
Express protocol.
The APS39903 provides operating frequency Jitter function from light
to full load range to improve the power supply EMI performance. The
APS39903 also has built-in fixed cable voltage drop compensation
(6% of nominal system output voltage) and adjustable line voltage
The APS39903 can work individually to achieve Ultra-Low standby
power under 5V output.
The APS39903 is packaged in SO-7.


  • Compatible to MediaTek Pump ExpressTM Protocol
  • Ultra-Low Standby Power Consumption
  • Built-in NPN Transistor with 700VCBO
  • 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 (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)


  • Adapters/Chargers

Product Specifications

Product Parameters

BVDSS (Min) (V) 700 V
Collector DC Current (A) 1.5 A
StartupCurrent (µA) 0.2 µA
OperatingCurrent (µA) 500 µA
UVLOThresholdon/off (V) 15.5 V
Power Rating (W) 5 W
StandbyPower (Max) (mW) 75 mW
CableCompensation Yes

Related Content


Technical Documents

Recommended Soldering Techniques


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)