1.2 A, 20 V, 700 kHz/1.4 MHz, Nonsynchronous Step-Down Regulator Data Sheet ADP2300/ADP2301 FEATURES TYPICAL APPLICATIONS CIRCUIT 1.2 A maximum load current BST 3.0V TO 20V VIN 2% output accuracy over temperature range V OUT Wide input voltage range: 3.0 V to 20 V ADP2300/ SW ADP2301 700 kHz (ADP2300) or 1.4 MHz (ADP2301) switching frequency options EN FB ON High efficiency up to 91% GND OFF Current-mode control architecture Output voltage from 0.8 V to 0.85 V IN Figure 1. Automatic PFM/PWM mode switching Precision enable pin with hysteresis 100 f = 1.4MHz SW Integrated high-side MOSFET f = 700kHz SW 95 Integrated bootstrap diode Internal compensation and soft start 90 Minimum external components 85 Undervoltage lockout (UVLO) 80 Overcurrent protection (OCP) and thermal shutdown (TSD) Available in ultrasmall, 6-lead TSOT package 75 Supported by ADIsimPower design tool 70 APPLICATIONS 65 LDO replacement for digital load applications V = 12V IN V = 5.0V OUT Intermediate power rail conversion 60 0 0.2 0.4 0.6 0.8 1.0 1.2 Communications and networking I (A) OUT Industrial and instrumentation Figure 2. Efficiency vs. Output Current Healthcare and medical Consumer GENERAL DESCRIPTION The ADP2300/ADP2301 are compact, constant-frequency, total solution size. Current-mode control provides fast and stable current-mode, step-down dc-to-dc regulators with integrated line and load transient performance. The ADP2300/ADP2301 power MOSFET. The ADP2300/ADP2301 devices run from devices include internal soft start to prevent inrush current at input voltages of 3.0 V to 20 V, making them suitable for a wide power-up. Other key safety features include short-circuit protec- range of applications. A precise, low voltage internal reference tion, thermal shutdown (TSD), and input undervoltage lockout makes these devices ideal for generating a regulated output (UVLO). The precision enable pin threshold voltage allows the voltage as low as 0.8 V, with 2% accuracy, for up to 1.2 A load ADP2300/ADP2301 to be easily sequenced from other input/ current. output supplies. It can also be used as a programmable UVLO input by using a resistive divider. There are two frequency options: the ADP2300 runs at 700 kHz, and the ADP2301 runs at 1.4 MHz. These options allow users to The ADP2300/ADP2301 are available in a 6-lead TSOT package make decisions based on the trade-off between efficiency and and are rated for the 40C to +125C junction temperature range. Rev. C 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 20102012 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com EFFICIENCY (%) 08342-001 08342-069ADP2300/ADP2301 Data Sheet TABLE OF CONTENTS Control Loop ............................................................................... 15 Features .............................................................................................. 1 Applications Information .............................................................. 16 Applications ....................................................................................... 1 ADIsimPower Design Tool ....................................................... 16 Typical Applications Circuit ............................................................ 1 Programming the Output Voltage ........................................... 16 General Description ......................................................................... 1 Voltage Conversion Limitations ............................................... 16 Revision History ............................................................................... 2 Low Input Voltage Considerations .......................................... 17 Specifications ..................................................................................... 3 Programming the Precision Enable ......................................... 17 Absolute Maximum Ratings ............................................................ 4 Inductor ....................................................................................... 18 Thermal Resistance ...................................................................... 4 Catch Diode ................................................................................ 19 ESD Caution .................................................................................. 4 Input Capacitor ........................................................................... 19 Pin Configuration and Function Descriptions ............................. 5 Output Capacitor ........................................................................ 19 Typical Performance Characteristics ............................................. 6 Thermal Considerations ............................................................ 20 Functional Block Diagram ............................................................ 13 Design Example .............................................................................. 21 Theory of Operation ...................................................................... 14 Switching Frequency Selection ................................................. 21 Basic Operation .......................................................................... 14 Catch Diode Selection ............................................................... 21 PWM Mode ................................................................................. 14 Inductor Selection ...................................................................... 21 Power Saving Mode .................................................................... 14 Output Capacitor Selection....................................................... 21 Bootstrap Circuitry .................................................................... 14 Resistive Voltage Divider Selection .......................................... 22 Precision Enable ......................................................................... 14 Circuit Board Layout Recommendations ................................... 23 Integrated Soft Start ................................................................... 14 Typical Application Circuits ......................................................... 24 Current Limit .............................................................................. 14 Outline Dimensions ....................................................................... 26 Short-Circuit Protection ............................................................ 15 Ordering Guide .......................................................................... 26 Undervoltage Lockout (UVLO) ............................................... 15 Thermal Shutdown ..................................................................... 15 REVISION HISTORY 11/12Rev. B to Rev. C Changes to Ordering Guide .......................................................... 26 6/12Rev. A to Rev. B Change to Features Section ............................................................. 1 Added ADIsimPower Design Tool Section ................................. 16 6/10Rev. 0 to Rev. A Changes to Figure 54 ...................................................................... 25 Changes to Ordering Guide .......................................................... 26 2/10Revision 0: Initial Version Rev. C Page 2 of 28