ADP1829Data SheetFUNCTIONAL BLOCK DIAGRAMINADP1829VREGLINEAR REG0.6V0.75V0.8VREF0.55VTHERMALUVLOSHUTDOWNVREGBST1VREGLDOSDILIM2DH1CK1EN1LOGICSQSW1PWMEN2PVRQFAULT1FAULT2CK1DL1FREQRAMP1VREGOSCILLATOR+ILIM1PGND1PHASE 1 = 0°CK2PHASE 2 = 180°50µA–SYNCCSL1RAMP2RAMP1+POK1COMP1––FB1+TRK10.75V++ +0.6V–BST2+SS10.8V0.55V–DH2CK2SQFAULT1SW2PWMPVRAMP2+QRCOMP2–DL2–FB2+VREGTRK20.75V++ ++PGND2ILIM20.6V50µA––UV2+CSL2SS20.8VPOK20.55V–FAULT2GNDBOTTOM PADDLEOF LFCSP 002 06784- Figure 2. Rev. D | Page 6 of 28 Document Outline FEATURES APPLICATIONS TYPICAL APPLICATION CIRCUIT GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION FUNCTIONAL BLOCK DIAGRAM PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION INPUT POWER START-UP LOGIC INTERNAL LINEAR REGULATOR OSCILLATOR AND SYNCHRONIZATION ERROR AMPLIFIER SOFT START POWER OK INDICATOR TRACKING MOSFET DRIVERS CURRENT LIMIT APPLICATIONS INFORMATION SELECTING THE INPUT CAPACITOR Selecting the Output LC Filter SELECTING THE MOSFETS SETTING THE CURRENT LIMIT FEEDBACK VOLTAGE DIVIDER COMPENSATING THE VOLTAGE MODE BUCK REGULATOR Type II Compensator Type III Compensator SOFT START VOLTAGE TRACKING COINCIDENT TRACKING RATIOMETRIC TRACKING Setting the Channel 2 Undervoltage Threshold for Ratiometric Tracking THERMAL CONSIDERATIONS PCB LAYOUT GUIDELINES LFCSP PACKAGE CONSIDERATIONS APPLICATION CIRCUITS OUTLINE DIMENSIONS ORDERING GUIDE