adp1871 datasheet(2/44 Pages) AD

Part #	ADP1871

Description	Synchronous Buck Controller with Constant On-Time and Valley Current Mode

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Manufacturer	AD [Analog Devices]

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ADP1870/ADP1871

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............................................................ 5

Thermal Resistance ...................................................................... 5

Boundary Condition.................................................................... 5

ESD Caution.................................................................................. 5

Pin Configuration and Function Descriptions............................. 6

Typical Performance Characteristics ............................................. 7

ADP1870/ADP1871 Block Diagram............................................ 18

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

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

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

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

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

On-Board Low Dropout Regulator.......................................... 19

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

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

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

Hiccup Mode During Short Circuit......................................... 21

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

Power Saving Mode (PSM) Version (ADP1871) ................... 22

Timer Operation ........................................................................ 22

Pseudo-Fixed Frequency ........................................................... 23

Applications Information .............................................................. 24

Feedback Resistor Divider ........................................................ 24

Inductor Selection ...................................................................... 24

Output Ripple Voltage (ΔVRR) .................................................. 24

Output Capacitor Selection....................................................... 24

Compensation Network ............................................................ 25

Efficiency Considerations ......................................................... 26

Input Capacitor Selection.......................................................... 27

Thermal Considerations............................................................ 28

Design Example.......................................................................... 29

External Component Recommendations.................................... 31

Layout Considerations................................................................... 33

IC Section (Left Side of Evaluation Board)............................. 37

Power Section ............................................................................. 37

Differential Sensing.................................................................... 38

Typical Applications Circuits........................................................ 39

15 A, 300 kHz High Current Application Circuit.................. 39

5.5 V Input, 600 kHz Application Circuit ............................... 39

300 kHz High Current Application Circuit ............................ 40

Outline Dimensions ....................................................................... 41

Ordering Guide .......................................................................... 41

REVISION HISTORY

3/10—Revision 0: Initial Version

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