Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details. SO-7

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APS39903 (Obsolete)

Pump Express Compatible AC-DC PSR Controller

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Description

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

compensation.

The APS39903 can work individually to achieve Ultra-Low standby

power under 5V output.

The APS39903 is packaged in SO-7.

Feature(s)

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)

Application(s)

Adapters/Chargers

Specifications & Technical Documents

Product Parameters

BV_DSS (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
StandbyPower (Max) (mW)	75 mW
CableCompensation	Yes

Technical Documents

Recommended Soldering Techniques

TN1.pdf

Purchase & Availability

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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-2770	2025-10-30	2025-10-30	Add Fab Site Code, Country of Diffusion (COD) and Assembly Site Origin (ASO) on Product and Shipping Labels for all Diodes Products
PCN-2519	2021-05-20	2021-11-20	Device End of Life (EOL)