NOT RECOMMENDED FOR NEW DESIGN - NO ALTERNATE PART AP3171 QUICK CHARGE BUCK CONVERTER COMPATIBLE TO QUALCOMM QC 2.0 Description Pin Assignments The AP3171 is a constant voltage (CV), constant current (CC) and synchronous rectification buck converter compatible with Qualcomm (Top View) Quick Charge 2.0. The AP3171 combines PWM controller, high/low side power MOSFETs, CC/CV control and Qualcomm QC 2.0 decoder in one GND VCC 8 1 package so as to achieve high performance with compact profile. According to different D+/D- signal combinations, the AP3171 will set CABLE CMP 2 7 PHASE the output voltage and full current capabilities to 5V/2A, 9V/2A or 12V/1.5A respectively. The AP3171 automatically provides 5V/2A VSEN D+ 3 6 output configuration to backwards compatible to the existing devices that are not compatible to Qualcomm QC 2.0. D- OUT 5 4 The AP3171 has a fixed switching frequency of 120kHz at heavy load. At light load and no load, its zero current detection (ZCD) Note: The PHASE pin of BUCK converter is exposed PAD, which is at bottom of function takes effect to have the system enter into discontinuous the IC (the dashed box). current mode (DCM) to improve power conversion efficiency. SO-8EP The AP3171 has versatile protection functions to guarantee a safe operation, including input voltage under voltage lock-out (UVLO), output voltage over voltage protection (OVP) and under voltage protection (UVP), inductor peak current limit and Internal over temperature protection (OTP). Furthermore, the AP3171 has cable compensation and it is adjustable by the external resistor. The AP3171 is available in the SO-8EP package. Features Applications Car Charger 8.7V to 40V Input Voltage Range Automotive Power application Fixed 120k Operating Frequency General DC/DC Application Need CC/CV Mode Integrated Two MOSFETs for Synchronization Rectification Quick Charge Function Compatible with Qualcomm QC 2.0 Protocol Input Protection UVLO Output Protection UVP/OVP OCP Function Adjustable Cable Compensation Output CC/CV Mode Function Reference Accuracy : CV 1.5% CC 4% (5V) CV 2.5% CC 5% (9V/12V) Output power: 5V/10W, 9V/18W, 12V/18W Internal OTP Function 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) & 2015/863/EU (RoHS 3) compliant. 2. See AP3171 Typical Applications Circuit VSEN V IN VCC OUT R7 PHASE L1 CMP C4 C5 (option) R4 C1 D- C2 CABLE (option) D+ C3 R5 GND Pin Descriptions Pin Number Pin Name Function IC voltage supplier and input voltage for power conversion Decoupling cap is required to be placed 1 VCC to this pin and GND pin as close as possible 2 CABLE Connected to the external resistor to set the cable compensation value 3 D+ Connected to USB D+ 4 D- Connected to USB D- 5 OUT Sense the output voltage connected to the input of current sense resistor 6 VSEN Sense the output current connected to the output of current sense resistor 7 CMP The EA output pin to compensate the loop 8 GND Ground return for the power stage and controller Exposed PAD PHASE Connected to the input of external output inductor 2 of 8 July 2020 AP3171 Diodes Incorporated www.diodes.com Document number: DS38006 Rev. 6 - 3 NEW PROD UCT AP3171