ADP1875 Analog Devices, ADP1875 Datasheet - Page 2

• Manufacturer Part Number: ADP1875
• Description: Synchronous Buck Controller with Constant On-Time, Valley Current Mode, and Power Saving Mode
• Manufacturer: Analog Devices

ADP1874/ADP1875
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Typical Applications Circuit............................................................ 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 6
Pin Configuration and Function Descriptions............................. 7
Typical Performance Characteristics ............................................. 8
ADP1874/ADP1875 Block Digram.............................................. 18
Theory of Operation ...................................................................... 19
REVISION HISTORY
2/11—Revision 0: Initial Version
Thermal Resistance ...................................................................... 6
Boundary Condition.................................................................... 6
ESD Caution.................................................................................. 6
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
Rev. 0 | Page 2 of 44
Applications Information .............................................................. 27
External Component Recommendations.................................... 34
Layout Considerations................................................................... 36
Typical Application Circuits ......................................................... 40
Outline Dimensions ....................................................................... 42
Timer Operation ........................................................................ 23
Pseudo-Fixed Frequency ........................................................... 24
Power Good Monitoring ........................................................... 24
Voltage Tracking......................................................................... 25
Feedback Resistor Divider ........................................................ 27
Inductor Selection ...................................................................... 27
Output Ripple Voltage (ΔV
Output Capacitor Selection....................................................... 27
Compensation Network ............................................................ 28
Efficiency Consideration........................................................... 29
Input Capacitor Selection.......................................................... 30
Thermal Considerations............................................................ 31
Design Example.......................................................................... 32
IC Section (Left Side of Evaluation Board)............................. 38
Power Section ............................................................................. 38
Differential Sensing.................................................................... 39
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
Ordering Guide .......................................................................... 42
RR
) .................................................. 27