ADP1876-EVALZ Analog Devices

600 kHz Dual Output Synchronous Buck PWM Controller with Linear Regulator Data Sheet ADP1876 FEATURES TYPICAL OPERATION CIRCUIT V IN Wide input range: 2.75 V to 20 V R RAMP1 Power stage input voltage: 1 V to 20 V Output voltage range: 0.6 V up to 90% V RAMP1 VIN IN Linear dropout (LDO) regulator with a fixed output ADP1876 M1 1.5 V at 150 mA EN1 L1 DH1 EN2 BST1 Output current more than 25 A per channel VDL V OUT1 SW1 R11 180 phase shift between channels for reduced input ILIM1 FB1 VCCO capacitance TRK1 M2 0.85% reference voltage accuracy from 40C to +85C DL1 R12 PGOOD1 Integrated boost diodes 3V to 5V INPUT R PGOOD2 CSG1 PGND1 Independent channel precision enable VINLDO VOUTLDO R RAMP2 Overcurrent limit protection V 1.5V RAMP2 IN Externally programmable soft start, slope compensation, NC M3 and current sense gain DH2 L2 COMP1 Thermal overload protection BST2 COMP2 V OUT2 Input undervoltage lockout (UVLO) SW2 R21 ILIM2 Power good with internal pull-up resistor FB2 Available in 32-lead, 5 mm 5 mm LFCSP M4 SS1 DL2 R22 SS2 R CSG2 APPLICATIONS AGND PGND2 Consumer applications Telecommunications base station and networking Figure 1. Industrial and instrumentation GENERAL DESCRIPTION sensing for enhanced noise immunity. The two PWM outputs The ADP1876 is a dual output dc-to-dc synchronous buck are phase shifted 180 for reducing the input current ripple and controller operating at 600 kHz fixed frequency with integrated the required input capacitance. drivers that drive N-channel power MOSFETs. An additional fixed voltage output, 150 mA linear regulator is available for The ADP1876 provides high speed, high peak current drive powering low power loads. The device operates in current capability with dead time optimization to enable energy mode for improved transient response and uses valley current efficient power conversion. Rev. B Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 2011-2017 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 10103-001ADP1876 Data Sheet TABLE OF CONTENTS Independent Low Dropout Linear Regulator ......................... 17 Features .............................................................................................. 1 Setting the Output Voltage of the Controller ......................... 17 Applications ....................................................................................... 1 Soft Start ...................................................................................... 17 Typical Operation Circuit ................................................................ 1 Setting the Current Limit .......................................................... 17 General Description ......................................................................... 1 Accurate Current-Limit Sensing .............................................. 17 Revision History ............................................................................... 2 Setting the Slope Compensation .............................................. 18 Functional Block Diagram .............................................................. 3 Setting the Current Sense Gain ................................................ 18 Specifications ..................................................................................... 4 Input Capacitor Selection .......................................................... 18 Absolute Maximum Ratings ....................................................... 7 Input Filter .................................................................................. 19 ESD Caution .................................................................................. 7 Boost Capacitor Selection ......................................................... 19 Pin Configuration and Function Descriptions ............................. 8 Inductor Selection ...................................................................... 19 Typical Performance Characteristics ........................................... 10 Output Capacitor Selection ....................................................... 19 Theory of Operation ...................................................................... 14 MOSFET Selection ..................................................................... 20 Independent Low Dropout Linear Regulator ......................... 14 Loop Compensation .................................................................. 21 Controller Architecture ............................................................. 14 Switching Noise and Overshoot Reduction ............................ 22 Input Undervoltage Lockout ..................................................... 14 PCB Layout Guideline ............................................................... 23 Internal Linear Regulator (VCCO) .......................................... 14 Typical Applications Circuit ..................................................... 23 Overvoltage Protection .............................................................. 15 Packaging and Ordering Information ......................................... 24 Power Good ................................................................................. 15 Outline Dimensions ................................................................... 24 Short-Circuit and Current-Limit Protection .......................... 15 Ordering Guide .......................................................................... 24 Shutdown Control ...................................................................... 15 Thermal Overload Protection ................................................... 16 Applications Information .............................................................. 17 REVISION HISTORY 3/2017Rev. A to Rev. B Changed CP-32-11 to CP-32-12 .................................. Throughout Updated Outline Dimensions ....................................................... 24 Changes to Ordering Guide .......................................................... 24 11/2011Rev. 0 to Rev. A Added Evaluation Board to Ordering Guide .............................. 24 9/2011Revision 0: Initial Version Rev. B Page 2 of 24