Dual 2 MHz, 800 mA, Synchronous, Low Quiescent Current Buck Regulator Data Sheet ADP2230 FEATURES TYPICAL APPLICATION CIRCUIT Input voltage range: 2.3 V to 6.5 V ADP2230 Fixed and adjustable output voltage options L1 2.2H V 2 VIN1 IN Fixed output voltage pair options: 1.2 V/1.8 V, 1.2 V/3.3 V, V 1 SW1 OUT1 C IN VIN2 1.8 V/3.3 V 9 10F FB1 C 3 OUT1 Adjustable output voltage range: 0.8 V to 6 V 10F Minimum guaranteed continuous output current: 800 mA ON 4 EN1 OFF L2 Up to 94% efficiency 2.2H ON 7 EN2 Low quiescent current of 15 A for both channels in power SW2 10 V OFF OUT2 PWM saving mode (PSM) FB2 8 C OUT2 6 SYNC Low shutdown current: 0.1 A (typical) 10F PSM/PWM PGND AGND (EPAD) 100% duty cycle for low dropout operation 5 11 SYNC pin switching frequency options 2 MHz fixed pulse-width modulation (PWM) mode Figure 1. Fixed Output Voltage Typical Application Circuit 2 MHz PSM/PWM automatic transitioning mode External clock synchronization from 1.5 MHz to 2.5 MHz Enable input with precision thresholds for each output 180 phase shifted PWM outputs for minimum V ripple IN Current-limit and thermal shutdown (TSD) protection Quick output discharge (QOD) 10-lead, 3 mm 3 mm 0.75 mm LFCSP package APPLICATIONS During logic controlled shutdown, the input is disconnected Portable and battery-powered equipment from the output, and it draws less than 0.1 A from the input Automatic meter readers (WSN) source. The ADP2230 operates from input voltages from 2.3 V Point of sales and transaction processing instruments to 6.5 V, allowing the use of multiple alkaline, NiMH, or lithium Mobile phones cells and other standard power sources. Digital cameras and audio devices The ADP2230 offers multiple options for setting the operating Medical instruments frequency. To maximize light load efficiency, the ADP2230 can Medium format display tablets and pads operate at a reduced switching frequency in PSM and switch GENERAL DESCRIPTION automatically to PWM as the load increases. The ADP2230 can The ADP2230 includes two high efficiency, low quiescent current, be forced to operate at 2 MHz in PWM only mode when noise 800 mA, step-down, dc-to-dc converters in a small, 10-lead, considerations are more important than efficiency. The 3 mm 3 mm, LFCSP package. The total solution requires only ADP2230 can also be synchronized with a 1.5 MHz to 2.5 MHz five tiny external components. When the ADP2230 is used with external clock via the SYNC pin. When using the external clock three 0603 capacitors and two 2 mm 2 mm inductors, the synchronization control, both buck outputs operate in phase 2 total solution size is about 48 mm , resulting in the smallest with the applied clock signal. footprint solution to meet a variety of portable applications. The ADP2230 includes an internal power switch, synchronous The ADP2230 buck regulator uses a proprietary, high speed, rectifier, and compensation to minimize external part count current mode, constant frequency, PWM control scheme for and maximize efficiency. Other key protection features include excellent stability and transient response. The buck outputs undervoltage lockout to prevent deep battery discharge, internal operate out of phase to reduce the input current ripple. soft start to prevent input current overshoot at startup, and an To ensure the longest battery life in portable applications, the integrated, switched resistor, QOD function that automatically ADP2230 has a power saving variable frequency mode that discharges the output when the device is disabled. Short-circuit reduces the switching frequency under light load conditions. protection and thermal overload protection circuits prevent damage in adverse conditions. Rev. 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Technical Support www.analog.com 10705-001ADP2230 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Theory of Operation ...................................................................... 12 Applications ....................................................................................... 1 Overview ..................................................................................... 12 General Description ......................................................................... 1 Operating Conditions ................................................................ 12 Typical Application Circuit ............................................................. 1 SYNC Pin Control Schemes...................................................... 13 Revision History ............................................................................... 2 Features Descriptions ................................................................ 13 Specifications ..................................................................................... 3 Applications Information .............................................................. 15 Recommended Component Specifications ............................... 4 Setting the Output Voltage ........................................................ 15 Absolute Maximum Ratings ............................................................ 5 Selecting the Inductor ................................................................ 15 Thermal Data ................................................................................ 5 Selecting the Input and Output Capacitors ............................ 16 Thermal Resistance ...................................................................... 5 PCB Layout Considerations .......................................................... 17 ESD Caution .................................................................................. 5 Outline Dimensions ....................................................................... 18 Pin Configuration and Function Descriptions ............................. 6 Ordering Guide .......................................................................... 18 Typical Performance Characteristics ............................................. 7 REVISION HISTORY 11/14Rev. 0 to Rev. A Changes to Ordering Guide .......................................................... 18 10/14Revision 0: Initial Version Rev. A Page 2 of 18