Datasheet ADP1621 (Analog Devices) - 2

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ADP1621 Data Sheet TABLE OF CONTENTS
Features .. 1 Duty Cycle ... 14 Applications ... 1 Setting the Output Voltage .. 14 General Description ... 1 Inductor Current Ripple .. 14 Typical Application Circuit ... 1 Inductor Selection .. 14 Revision History ... 2 Input Capacitor Selection .. 15 Simplified Block Diagram ... 3 Output Capacitor Selection ... 15 Specifications ... 4 Diode Selection ... 16 Absolute Maximum Ratings .. 6 MOSFET Selection ... 16 Thermal Resistance .. 6 Loop Compensation .. 17 ESD Caution .. 6 Slope Compensation .. 18 Pin Configuration and Function Descriptions ... 7 Current Limit .. 18 Typical Performance Characteristics ... 8 Light Load Operation .. 19 Theory of Operation .. 12 Recommended Component Manufacturers ... 19 Control Loop ... 12 Layout Considerations ... 20 Current-Sense Configurations .. 12 Efficiency Considerations ... 21 Current Limit .. 13 Examples of Application Circuits ... 22 Undervoltage Lockout ... 13 Standard Boost Converter—Design Example .. 22 Shutdown ... 13 Bootstrapped Boost Converter ... 23 Soft Start .. 13 SEPIC Converter Circuit ... 27 Internal Shunt Regulators .. 13 Low Voltage Power-Input Circuit .. 27 Setting the Oscillator Frequency and Synchronization LED Driver Application Circuits ... 28 Frequency .. 13 Related Devices ... 30 Application Information: Boost Converter ... 14 Outline Dimensions ... 31 ADIsimPower Design Tool ... 14 Ordering Guide .. 31
REVISION HISTORY 2/16— Rev. C to Rev. D 12/06—Rev. 0 to Rev. A
Changes to Figure 39 and Figure 40 ... 27 Changes to Table 1 ... 3 Changes to Table 2 ... 5
10/15—Rev. B to Rev. C
Added Table 3 .. 5 Moved Figure 3 ... 3 Changes to Table 5 .. 19 Changes to Shunt Regulation Voltage Parameter, Table 1 .. 4 Changes to Ordering Guide .. 31
6/12—Rev. A to Rev. B 7/06—Revision 0: Initial Version
Change to Features Section ... 1 Added ADIsimPower Design Tool Section ... 14 Change to Table 6 ... 30 Updated Outline Dimensions ... 31 Changes to Ordering Guide .. 31 Rev. D | Page 2 of 32 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION TYPICAL APPLICATION CIRCUIT TABLE OF CONTENTS REVISION HISTORY SIMPLIFIED BLOCK DIAGRAM SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CONTROL LOOP CURRENT-SENSE CONFIGURATIONS CURRENT LIMIT UNDERVOLTAGE LOCKOUT SHUTDOWN SOFT START INTERNAL SHUNT REGULATORS SETTING THE OSCILLATOR FREQUENCY AND SYNCHRONIZATION FREQUENCY APPLICATION INFORMATION: BOOST CONVERTER ADIsimPower DESIGN TOOL DUTY CYCLE SETTING THE OUTPUT VOLTAGE INDUCTOR CURRENT RIPPLE INDUCTOR SELECTION INPUT CAPACITOR SELECTION OUTPUT CAPACITOR SELECTION DIODE SELECTION MOSFET SELECTION LOOP COMPENSATION SLOPE COMPENSATION CURRENT LIMIT LIGHT LOAD OPERATION Discontinuous Conduction Mode Pulse-Skipping Modulation RECOMMENDED COMPONENT MANUFACTURERS LAYOUT CONSIDERATIONS EFFICIENCY CONSIDERATIONS EXAMPLES OF APPLICATION CIRCUITS STANDARD BOOST CONVERTER—DESIGN EXAMPLE BOOTSTRAPPED BOOST CONVERTER Low Input and High Output Boost Converter High Input Voltage Boost Converter Circuit SEPIC CONVERTER CIRCUIT LOW VOLTAGE POWER-INPUT CIRCUIT LED DRIVER APPLICATION CIRCUITS RELATED DEVICES OUTLINE DIMENSIONS ORDERING GUIDE