Datasheet ADP1853 (Analog Devices) - 2

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ADP1853 Data Sheet TABLE OF CONTENTS
Features .. 1  Thermal Overload Protection .. 16  Applications ... 1  Interleaved Dual-Phase Operation .. 16  General Description ... 1  Applications Information .. 17  Revision History ... 2  ADIsimPower Design Tool ... 17  Specifications ... 3  Setting the Output Voltage .. 17  Absolute Maximum Ratings .. 6  Soft Start .. 17  ESD Caution .. 6  Setting the Current Limit .. 17  Simplified Block Diagram ... 7  Accurate Current-Limit Sensing .. 17  Pin Configuration and Function Descriptions ... 8  Input Capacitor Selection .. 17  Typical Performance Characteristics ... 10  VIN Pin Filter ... 18  Theory of Operation .. 12  Boost Capacitor Selection ... 18  Control Architecture .. 12  Inductor Selection .. 18  Oscillator Frequency .. 12  Output Capacitor Selection ... 18  Synchronization .. 13  MOSFET Selection ... 19  PWM or Pulse Skip Mode of Operation ... 13  Loop Compensation—Voltage Mode .. 20  CLKOUT Signal .. 13  Loop Compensation—Current Mode ... 21  Synchronous Rectifier and Dead Time ... 14  Switching Noise and Overshoot Reduction .. 23  Input Undervoltage Lockout ... 14  Voltage Tracking ... 23  Internal Linear Regulator .. 14  PCB Layout Guidlines ... 24  Overvolage Protection ... 14  Typical Operating Circuits .. 25  Power Good ... 14  Outline Dimensions ... 27  Short-Circuit and Current-Limit Protection .. 15  Ordering Guide .. 27  Enable/Disable Control ... 15 
REVISION HISTORY 2/2017—Rev. 0 to Rev. A
Updated Outline Dimensions ... 27 Changes to Ordering Guide .. 27
5/2012—Revision 0: Initial Version
Rev. A | Page 2 of 28 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION SIMPLIFIED BLOCK DIAGRAM PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CONTROL ARCHITECTURE OSCILLATOR FREQUENCY SYNCHRONIZATION PWM OR PULSE SKIP MODE OF OPERATION CLKOUT SIGNAL SYNCHRONOUS RECTIFIER AND DEAD TIME INPUT UNDERVOLTAGE LOCKOUT INTERNAL LINEAR REGULATOR OVERVOLAGE PROTECTION POWER GOOD SHORT-CIRCUIT AND CURRENT-LIMIT PROTECTION ENABLE/DISABLE CONTROL THERMAL OVERLOAD PROTECTION INTERLEAVED DUAL-PHASE OPERATION APPLICATIONS INFORMATION ADISIMPOWER DESIGN TOOL SETTING THE OUTPUT VOLTAGE SOFT START SETTING THE CURRENT LIMIT ACCURATE CURRENT-LIMIT SENSING INPUT CAPACITOR SELECTION VIN PIN FILTER BOOST CAPACITOR SELECTION INDUCTOR SELECTION OUTPUT CAPACITOR SELECTION MOSFET SELECTION LOOP COMPENSATION—VOLTAGE MODE Type III Compensation LOOP COMPENSATION—CURRENT MODE Setting the Slope Compensation Setting the Current Sense Gain Type II Compensation SWITCHING NOISE AND OVERSHOOT REDUCTION VOLTAGE TRACKING Coincident Tracking Ratiometric Tracking PCB LAYOUT GUIDLINES TYPICAL OPERATING CIRCUITS OUTLINE DIMENSIONS ORDERING GUIDE