The APS39903MTR-G1 is a high accuracy and low cost switching modepower supply switcher for battery charger/adapter applications. It isconsists of a primary side regulation controller and a high voltagetransistor. The controller regulates the output voltage and current inthe primary side by piece-wise Pulse Frequency Modulation (p-PFM)in discontinuous conduction mode (DCM). The switcher uses adaptivesource current to optimize driving current to reduce driving loss. Thesystem operating frequency reduces linearly from heavy load to lightload in each interval of the p-PFM, and enters constant current modewhen the load current is equal to the maximum system output current.The output voltage and output current limit of APS39903MTR-G1 can beadjusted based on the patterns of load current aligned to MTK PumpExpress protocol. The APS39903MTR-G1 provides operating frequency Jitter function from lightto full load range to improve the power supply EMI performance. TheAPS39903MTR-G1 also has built-in fixed cable voltage drop compensation(6% of nominal system output voltage) and adjustable line voltagecompensation. The APS39903MTR-G1 can work individually to achieve Ultra-Low standbypower under 5V output. The APS39903MTR-G1 is packaged in SO-7.
Feature
- 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)
Applications
- Adapters/Chargers
