ADP1874ARQZ-0.3-R7 datasheet(2/44 Pages) AD

2 / 44 page

ADP1874/ADP1875

Rev. 0 | Page 2 of 44

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications....................................................................................... 1

General Description ......................................................................... 1

Typical Applications Circuit............................................................ 1

Revision History ............................................................................... 2

Specifications..................................................................................... 3

Absolute Maximum Ratings............................................................ 6

Thermal Resistance ...................................................................... 6

Boundary Condition .................................................................... 6

ESD Caution.................................................................................. 6

Pin Configuration and Function Descriptions............................. 7

Typical Performance Characteristics ............................................. 8

ADP1874/ADP1875 Block Digram.............................................. 18

Theory of Operation ...................................................................... 19

Startup.......................................................................................... 19

Soft Start ...................................................................................... 19

Precision Enable Circuitry ........................................................ 19

Undervoltage Lockout ............................................................... 19

On-Board Low Dropout Regulator.......................................... 20

Thermal Shutdown..................................................................... 20

Programming Resistor (RES) Detect Circuit.......................... 20

Valley Current-Limit Setting .................................................... 20

Hiccup Mode During Short Circuit......................................... 22

Synchronous Rectifier................................................................ 22

ADP1875 Power Saving Mode (PSM) ..................................... 22

Timer Operation ........................................................................ 23

Pseudo-Fixed Frequency ........................................................... 24

Power Good Monitoring ........................................................... 24

Voltage Tracking......................................................................... 25

Applications Information .............................................................. 27

Feedback Resistor Divider ........................................................ 27

Inductor Selection ...................................................................... 27

Output Ripple Voltage (ΔVRR) .................................................. 27

Output Capacitor Selection....................................................... 27

Compensation Network ............................................................ 28

Efficiency Consideration........................................................... 29

Input Capacitor Selection.......................................................... 30

Thermal Considerations............................................................ 31

Design Example.......................................................................... 32

External Component Recommendations.................................... 34

Layout Considerations................................................................... 36

IC Section (Left Side of Evaluation Board)............................. 38

Power Section ............................................................................. 38

Differential Sensing.................................................................... 39

Typical Application Circuits ......................................................... 40

12 A, 300 kHz High Current Application Circuit.................. 40

5.5 V Input, 600 kHz Application Circuit ............................... 40

300 kHz High Current Application Circuit ............................ 41

Outline Dimensions ....................................................................... 42

Ordering Guide .......................................................................... 42

REVISION HISTORY

2/11—Revision 0: Initial Version

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