COMP PHASE2 LGATE2 VSNS PVCC GNDSNS GND FS LGATE1 VREF PHASE1 REFIN A Product Line of Diodes Incorporated AP3598A COMPACT DUAL-PHASE SYNCHRONOUS-RECTIFIED BUCK CONTROLLER Description Pin Assignments The AP3598A is a dual-phase synchronous buck PWM controller with (Top View) integrated drivers which are optimized for high performance graphic card and computer applications. The IC is capable of delivering up to 60A output current capability, supporting 12V MOSFET drivers with Pin 1 Mark internal bootstrap diodes. 24 23 22 21 20 19 The dynamic output voltage could be implemented by analog method BOOT1 BOOT2 1 18 with a switching device and a resistor network. The adjustable current HGATE1 2 17 HGATE2 balance is achieved by R current sensing technique. DS(ON) 3 16 EN PGOOD THERM/ GND PSI 4 15 VCC The AP3598A provides over current protection, input/output under 14 TALERT VID 5 voltage protection, over voltage protection and over temperature 25 REFADJ 6 13 TSNS protection. 7 8 9 10 11 12 Other features include adjustable soft start, adjustable operation frequency and so on. With aforementioned functions, the IC adopts U- QFN4040-24 package. U-QFN4040-24 Features Applications Operate with Single Supply Voltage Reference Voltage Output with 1% Accuracy Middle-High End Graphic Card Simple Single Loop Voltage Mode Control Generic Desktop and Consumer Electronics 12V Bootstrapped Drivers with Internal Boot-strap Diodes Adjustable Current Balancing by R Current Sensing DS(ON) Adjustable Operation Frequency from 200kHz to7500kHz Per Phase External Compensation Dynamic Output Voltage Adjustment Adjustable Soft Start Built-in UV and OV Protection Function Built-in Over Current Protection Built-in Thermal Shutdown Function U-QFN4040-24 Package 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 AP3598A Typical Applications Circuit Driver Supply Voltage Supply Voltage AP3598A V IN V 15 21 PCC V VCC PVCC CC CPVCC C D VCC Q1 Frequency C VIN1 Selection G 2 R HG1 9 HGATE1 FS S C BT1 1 BOOT1 L1 24 D R FS PHASE1 R R R PG EN PSI Q2 G 23 LGATE1 S VOUT Optional 16 Strap1 R LG1 PGOOD OUT V IN 3 IN EN COUT D R PSI2 Q3 4 PSI IN C VIN2 R HG2 G 17 5 IN VID HGATE2 S CVREF C 8 18 BT2 BOOT2 VREF L2 19 D PHASE2 Q4 R V VREF1 REF G 20 R VOUT R 7 LGATE2 VGND REFIN S R REFADJ R TM2 6 REFADJ R TALERT V GND SNS 10 R VREF2 GNDSNS CREFIN R2 11 VSNS C3 VOUT SNS C5 R3 12 COMP 14 R1 C4 OUT TALERT RTM 22 13 Opamp Compensation GND TSNS 25 THERM/GND External Thermister Component Value Unit Component Value Unit Component Value Unit 10 F 100 k C3 10 pF C R VCC TALERT 10 F TBD k C4 2.2 nF C R PVCC TM2 300 F TBD k C5 1.5 nF C R VIN1 TM 300 F 0 330*3 F C R C VIN2 HG1 OUT 100 k 100 nF 0 R C R PG BT1 VOUT 100 k Note 4 0 R R R EN LG1 VGND 33 k 0 0.033 F R R C FS HG2 REFIN R 100 k C 100 nF Q1 PSI BT2 R 0 k R1 12 k Q2 PSI2 C 1 F R2 2.2 k Q3 VREF R 4.75 k R3 560 Q4 VREF1 R 4.22 k L1 0.36 H VREF2 R 6.34 k L2 0.36 H REFADJ Table 1. Component Guide Note 4: R are OCP setting resisters: LG1 5k for lower OCP threshold, I = 150mV/R OCP DS(ON) 10k for medium OCP threshold, I = 250mV/R OCP DS(ON) >20k for disabling OCP function 2 of 28 AP3598A November 2014 Diodes Incorporated www.diodes.com Document number: DS37261 Rev. 2 - 2 NEW PRODUCT