APS39903MTR-G1 Diodes Incorporated

A Product Line of Diodes Incorporated APS39903 TM PUMP EXPRESS COMPATIBLE AC/DC PSR SWITCHER Description Pin Assignments The APS39903 is a high accuracy and low cost switching mode (Top View) 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 GND CPC 1 7 the primary side by piece-wise Pulse Frequency Modulation (p-PFM) in discontinuous conduction mode (DCM). The switcher uses adaptive FB 2 source current to optimize driving current to reduce driving loss. The system operating frequency reduces linearly from heavy load to light VCC C 3 6 load in each interval of the p-PFM, and enters constant current mode CS 5 C 4 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 SO-7 Express protocol. The APS39903 provides operating frequency Jitter function from light Features to full load range to improve the power supply EMI performance. The APS39903 also has built-in fixed cable voltage drop compensation TM (6% of nominal system output voltage) and adjustable line voltage Compatible to MediaTek Pump Express Protocol compensation. Ultra-Low Standby Power Consumption Built-in NPN Transistor with 700V CBO The APS39903 can work individually to achieve Ultra-Low standby Valley-turn On to Reduce Switching Loss and Benefit for EMI power under 5V output. Piece-wise Frequency Reduction to Enhance Conversion Efficiency and Suppress Audio Noise The APS39903 is packaged in SO-7. 5% Constant Voltage Accuracy for 5V Output Audio Noise Suppression Open Circuit Protection (OCkP) Current Sense Resistor Short Protection Over Voltage Protection (OVP) Applications Over Temperature Protection (OTP) Short Circuit Protection (SCP) with Hiccup Adapters/Chargers Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. Green Device (Note 3) Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See A Product Line of Diodes Incorporated APS39903 Typical Applications Circuit FR1 L1 TR1 D1 C7 R12 R3 D4~D7 C1 C2 + + D2 + + R1 C3 C4 R4 R11 R10 5V/1A L2 D3 C5 APS39903 3 VCC 5, 6 R13 C 1 2 CPC FB C6 4 CS 7 GND R14 R2 Pin Descriptions Pin Number Pin Name Function A capacitor is connected to this pin to form a low pass filter for cable voltage drop 1 CPC compensation, audio noise suppression and detecting the patterns of load current to change the output voltage and current 2 FB The CV and CC regulation are realized base on the voltage sampling of this pin VCC supply pin for the switcher. A capacitor with low ESR should be placed as close 3 VCC as possible to this pin Current senses pin of IC. The CS pin will turn off the power transistor when the CS 4 CS pin voltage reaches turn off threshold. 5, 6 C This pin is connected with an internal power BJTs collector 7 GND The ground of the switcher 2 of 17 APS39903 October 2014 Diodes Incorporated www.diodes.com Document number: DS37226 Rev. 2 - 2 NEW PRODUCT