Datasheet LT8210 (Analog Devices) - 2

LT8210
TABLE OF CONTENTS Features ... 1
Reverse Input Protection ..20
Applications .. 1
Current Monitoring and Regulation ..20
Typical Application .. 1
Buck Foldback ...21
Description.. 1
Bootstrap Capacitor Voltage ...21
Table of Contents .. 2
PWGD Pin ...22
Absolute Maximum Ratings .. 3 Applications Information ..23 Pin Configuration .. 3
Maximum Output Current and RSENSE Selection ..23
Order Information .. 3
Inductor Selection... 24
Electrical Characteristics ... 4
Switching Frequency Selection ...25
Typical Performance Characteristics ... 7
RT Set Switching Frequency ...25
Pin Functions ..12
Spread-Spectrum Frequency Modulation ..26
Block Diagram ...14
Power MOSFET Selection ...27
Operation...15
CIN and COUT Selection ...28 Overview ... 15 Bootstrap Capacitors (CBST1, CBST2) ...29 Continuous Conduction Mode (CCM) ... 15 Bootstrap Diodes (DBST1, DBST2) ..30 Discontinuous Conduction Mode (DCM) .. 15 EXTVCC, GATEVCC and VDD  ...30 Burst Mode Operation ... 15 Programming Output Voltage ...31 Pass-Thru Mode ... 15 Programming Input or Output Current Limit ...31 Power Switch Control (CCM, DCM, Burst Programming VIN UVLO ...33 Mode Operation) ... 16 Soft-Start ..33 Power Switch Control: Buck Region Loop Compensation ...33 (VINP > 1.19 • VOUT) .. 17 Optional DG MOSFET Selection ..34 Power Switch Control: Boost Region Component Optimization for Pass-Thru Operation .34 (VINP < 0.84 • VOUT) ... 17 Efficiency Considerations ..35 Power Switch Control: Buck-Boost Region PC Board Layout Checklist ..36 (0.84 • VOUT < VINP < 1.19 • VOUT) .. 17
Typical Applications ..38
Power Switch Control (Pass-Thru Mode) .. 18
Revision History ..45
Transitioning Between Operating Modes .. 18
Typical Application ...46
Enable and Start-Up .. 19
Related Parts ..46
EXTVCC/GATEVCC/VDD Power Supplies .. 19 Rev. A 2 For more information www.analog.com Document Outline Features Applications Typical Application Description Table of Contents Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Revision History Typical Application Related Parts