Datasheet ADP1882, ADP1883 (Analog Devices) - 2

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ADP1882/ADP1883 TABLE OF CONTENTS
Features .. 1  Timer Operation .. 22  Applications ... 1  Pseudo-Fixed Frequency ... 23  Typical Applications Circuit .. 1  Applications Information .. 24  General Description ... 1  Feedback Resistor Divider .. 24  Revision History ... 2  Inductor Selection .. 24  Specifications ... 3  Output Ripple Voltage (ΔVRR) .. 24  Absolute Maximum Ratings .. 5  Output Capacitor Selection ... 24  Thermal Resistance .. 5  Compensation Network .. 25  Boundary Condition .. 5  Efficiency Considerations ... 26  ESD Caution .. 5  Input Capacitor Selection .. 27  Pin Configuration and Function Descriptions ... 6  Thermal Considerations .. 28  Typical Performance Characteristics ... 7  Design Example .. 28  ADP1882/ADP1883 Block Diagram .. 18  External Component Recommendations .. 31  Theory of Operation .. 19  Layout Considerations ... 33  Startup .. 19  IC Section (Left Side of Evaluation Board) ... 36  Soft Start .. 19  Power Section ... 36  Precision Enable Circuitry .. 19  Differential Sensing .. 36  Undervoltage Lockout ... 19  Typical Applications Circuits .. 37  Thermal Shutdown ... 19  Dual-Input, 300 kHz High Current Applications Circuit ... 37  Programming Resistor (RES) Detect Circuit .. 20  Single-Input, 600 kHz Applications Circuit ... 37  Valley Current-Limit Setting .. 20  Dual-Input, 300 kHz High Current Applications Circuit ... 38  Hiccup Mode During Short Circuit ... 21  Outline Dimensions ... 39  Synchronous Rectifier .. 22  Ordering Guide .. 39  Power Saving Mode (PSM) Version (ADP1883) .. 22 
REVISION HISTORY 4/10—Revision 0: Initial Version
Rev. 0 | Page 2 of 40 Document Outline FEATURES APPLICATIONS TYPICAL APPLICATIONS CIRCUIT GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE BOUNDARY CONDITION ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS ADP1882/ADP1883 BLOCK DIAGRAM THEORY OF OPERATION STARTUP SOFT START PRECISION ENABLE CIRCUITRY UNDERVOLTAGE LOCKOUT THERMAL SHUTDOWN PROGRAMMING RESISTOR (RES) DETECT CIRCUIT VALLEY CURRENT-LIMIT SETTING HICCUP MODE DURING SHORT CIRCUIT SYNCHRONOUS RECTIFIER POWER SAVING MODE (PSM) VERSION (ADP1883) TIMER OPERATION PSEUDO-FIXED FREQUENCY APPLICATIONS INFORMATION FEEDBACK RESISTOR DIVIDER INDUCTOR SELECTION OUTPUT RIPPLE VOLTAGE (ΔVRR) OUTPUT CAPACITOR SELECTION COMPENSATION NETWORK Output Filter Impedance (ZFILT) Error Amplifier Output Impedance (ZCOMP) Error Amplifier Gain (GM) Current-Sense Loop Gain (GCS) Crossover Frequency EFFICIENCY CONSIDERATIONS Channel Conduction Loss MOSFET Driver Loss Switching Loss Diode Conduction Loss Inductor Loss INPUT CAPACITOR SELECTION THERMAL CONSIDERATIONS DESIGN EXAMPLE Input Capacitor Inductor Current Limit Programming Output Capacitor Feedback Resistor Network Setup Compensation Network Loss Calculations EXTERNAL COMPONENT RECOMMENDATIONS LAYOUT CONSIDERATIONS IC SECTION (LEFT SIDE OF EVALUATION BOARD) POWER SECTION DIFFERENTIAL SENSING TYPICAL APPLICATIONS CIRCUITS DUAL-INPUT, 300 kHz HIGH CURRENT APPLICATIONS CIRCUIT SINGLE-INPUT, 600 kHz APPLICATIONS CIRCUIT DUAL-INPUT, 300 kHz HIGH CURRENT APPLICATIONS CIRCUIT OUTLINE DIMENSIONS ORDERING GUIDE