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ADP1875-0.3-EVALZ Datasheet(PDF) 2 Page - Analog Devices

No. de pieza ADP1875-0.3-EVALZ
Descripción Electrónicos  Synchronous Buck Controller with Constant On-Time and Valley Current Mode
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
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ADP1875-0.3-EVALZ Datasheet(HTML) 2 Page - Analog Devices

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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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