ADP1879 Analog Devices, ADP1879 Datasheet - Page 2

• Manufacturer Part Number: ADP1879
• Description: Synchronous Buck Controller with Constant On-Time and Valley Current Mode with Power Saving Mode
• Manufacturer: Analog Devices

ADP1878/ADP1879
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Typical Applications Circuit ............................................................ 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Pin Configuration and Function Descriptions ............................. 6
Typical Performance Characteristics ............................................. 7
Theory of Operation ...................................................................... 17
REVISION HISTORY
7/11—Revision 0: Initial Version
Absolute Maximum Ratings ....................................................... 5
Thermal Resistance ...................................................................... 5
ESD Caution .................................................................................. 5
Block Diagram ............................................................................ 17
Startup .......................................................................................... 18
Soft Start ...................................................................................... 18
Precision Enable Circuitry ........................................................ 18
Undervoltage Lockout ............................................................... 18
On-Board Low Dropout (LDO) Regulator ............................. 18
Thermal Shutdown ..................................................................... 19
Programming Resistor (RES) Detect Circuit .......................... 19
Valley Current-Limit Setting .................................................... 19
Hiccup Mode During Short Circuit ......................................... 21
Synchronous Rectifier ................................................................ 21
ADP1879 Power Saving Mode (PSM) ...................................... 21
Timer Operation ......................................................................... 22
Rev. 0 | Page 2 of 40
Applications Information .............................................................. 24
External Component Recommendations .................................... 31
Layout Considerations ................................................................... 33
Typical Application Circuits ......................................................... 37
Packaging and Ordering Information ......................................... 39
Pseudo Fixed Frequency............................................................ 22
Power-Good Monitoring ........................................................... 23
Feedback Resistor Divider ........................................................ 24
Inductor Selection ...................................................................... 24
Output Ripple Voltage ( ΔV
Output Capacitor Selection....................................................... 24
Compensation Network ............................................................ 25
Efficiency Consideration ........................................................... 26
Input Capacitor Selection .......................................................... 27
Thermal Considerations ............................................................ 27
Design Example .......................................................................... 29
IC Section (Left Side of Evaluation Board) ............................. 35
Power Section ............................................................................. 35
Differential Sensing .................................................................... 36
12 A, 300 kHz High Current Application Circuit .................. 37
5.5 V Input, 600 kHz Current Application Circuit ................ 37
300 kHz High Current Application Circuit ............................ 38
Outline Dimensions ................................................................... 39
Ordering Guide .......................................................................... 40
RR
) .................................................. 24
Data Sheet