Datasheet ADP2127 (Analog Devices) - 2

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ADP2126/ADP2127 Data Sheet TABLE OF CONTENTS
Features .. 1  External Clock (EXTCLK) Enable ... 11  Applications... 1  Spread Spectrum Oscillator .. 12  Typical Applications Circuit.. 1  Mode Selection ... 12  General Description ... 1  Internal Control Features .. 12  Revision History ... 2  Protection Features .. 13  Specifications... 3  Timing Constraints .. 13  Timing Diagrams.. 4  Applications Information .. 14  Absolute Maximum Ratings.. 5  Inductor Selection .. 14  Thermal Considerations.. 5  Input Capacitor Selection.. 14  Thermal Resistance .. 5  Output Capacitor Selection... 15  ESD Caution.. 5  Thermal Considerations.. 15  Pin Configuration and Function Descriptions... 6  PCB Layout Guidelines.. 16  Typical Performance Characteristics ... 7  Outline Dimensions ... 17  Theory of Operation .. 11  Ordering Guide .. 18  Overview.. 11 
REVISION HISTORY 3/12—Rev. A to Rev. B 5/11—Rev. 0 to Rev. A
Combined Figure 1 and Figure 2; Renumbered Sequentially... 1 Changes to Figure 35.. 17 Changes to Undervoltage Lockout (UVLO) Section,
5/11—Revision 0: Initial Version
Added Figure 29, Renumbered Sequentially .. 13 Changes to Table 6.. 14 Changes to Ordering Guide .. 18 Rev. B | Page 2 of 20 Document Outline FEATURES APPLICATIONS TYPICAL APPLICATIONS CIRCUIT GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING DIAGRAMS ABSOLUTE MAXIMUM RATINGS THERMAL CONSIDERATIONS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION OVERVIEW EXTERNAL CLOCK (EXTCLK) ENABLE SPREAD SPECTRUM OSCILLATOR MODE SELECTION Pulse-Width Modulation (PWM) Mode Auto Mode (PFM and PWM Switching) Pulse Frequency Modulation (PFM) Mode Mode Transition INTERNAL CONTROL FEATURES Synchronous Rectification Soft Start PROTECTION FEATURES Overcurrent Protection Output Short-Circuit Protection (SCP) Thermal Shutdown (TSD) Protection Undervoltage Lockout (UVLO) TIMING CONSTRAINTS Shutdown Time Power-Off Time APPLICATIONS INFORMATION INDUCTOR SELECTION INPUT CAPACITOR SELECTION OUTPUT CAPACITOR SELECTION THERMAL CONSIDERATIONS PCB LAYOUT GUIDELINES OUTLINE DIMENSIONS ORDERING GUIDE