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ADP1870ARMZ-0.6-R7 Datasheet(PDF) 2 Page - Analog Devices

Part # ADP1870ARMZ-0.6-R7
Description  Synchronous Buck Controller with Constant On-Time and Valley Current Mode
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADP1870ARMZ-0.6-R7 Datasheet(HTML) 2 Page - 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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