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ADP2120 Dataheets PDF



Part Number ADP2120
Manufacturers Analog Devices
Logo Analog Devices
Description Step-Down DC-to-DC Regulators
Datasheet ADP2120 DatasheetADP2120 Datasheet (PDF)

Data Sheet 2 A/1.25 A, 1.2 MHz, Synchronous, Step-Down DC-to-DC Regulators ADP2119/ADP2120 FEATURES Continuous output current ADP2119: 2 A ADP2120: 1.25 A 145 mΩ and 70 mΩ integrated MOSFETs Input voltage range from 2.3 V to 5.5 V Output voltage from 0.6 V to VIN ±1.5% output accuracy 1.2 MHz fixed switching frequency Synchronizable between 1 MHz and 2 MHz Selectable PWM or PFM mode operation Current mode architecture Precision threshold enable input Power-good flag Voltage tracking Integrated.

  ADP2120   ADP2120



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Data Sheet 2 A/1.25 A, 1.2 MHz, Synchronous, Step-Down DC-to-DC Regulators ADP2119/ADP2120 FEATURES Continuous output current ADP2119: 2 A ADP2120: 1.25 A 145 mΩ and 70 mΩ integrated MOSFETs Input voltage range from 2.3 V to 5.5 V Output voltage from 0.6 V to VIN ±1.5% output accuracy 1.2 MHz fixed switching frequency Synchronizable between 1 MHz and 2 MHz Selectable PWM or PFM mode operation Current mode architecture Precision threshold enable input Power-good flag Voltage tracking Integrated soft start Internal compensation Startup with precharged output UVLO, OVP, OCP, and thermal shutdown 10-lead, 3 mm × 3 mm LFCSP_WD package Supported by ADIsimPower™ design tool APPLICATIONS Point of load conversion Communications and networking equipment Industrial and instrumentation Consumer electronics Medical applications GENERAL DESCRIPTION The ADP2119/ADP2120 are low quiescent current, synchronous, step-down dc-to-dc regulators in a compact 3 mm × 3 mm LFCSP_WD package. Both devices use a current mode, constant frequency pulse-width modulation (PWM) control scheme for excellent stability and transient response. Under light load conditions, they can be configured to operate in a pulse frequency modulation (PFM) mode, which reduces switching frequency to save power. The ADP2119/ADP2120 support input voltages from 2.3 V to 5.5 V. The output voltage can be adjusted from 0.6 V up to the input voltage (VIN) for the adjustable version, whereas the fixed output version is available in preset output voltage options of 3.3 V, 2.5 V, 1.8 V, 1.5 V, 1.2 V, and 1.0 V. The ADP2119/ADP2120 require minimal external parts and provide a high efficiency solution with their integrated power switches, synchronous rectifiers, and internal compensation. Each IC draws less than 2 µA current from the input source when it is disabled. Other key features include undervoltage lockout (UVLO), integrated soft start to limit inrush current at startup, overvoltage protection (OVP), overcurrent protection Rev. A 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 rights of third parties that may result from its use. Specifications subject to change without notice. No 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. TYPICAL APPLICATION CIRCUIT C1 0.1µF VIN 5V CIN 22µF X5R 6.3V R1 10Ω ADP2119/ADP2120 1 VIN EN 10 VOUT 3.3V COUT 22µF X5R 6.3V RBOT 2.21kΩ L 1.5µH RTOP 10kΩ 2 PVIN 3 SW SYNC/MODE 9 R2 10kΩ PGOOD 8 4 PGND TRK 7 5 GND FB 6 Figure 1. 08716-001 EFFICIENCY (%) 08716-002 (OCP), and thermal shutdown (TSD). 100 VIN = 5V 90 VOUT = 1.8V 80 70 PFM 60 50 40 FPWM 30 20 10 0 0.01 0.1 1 OUTPUT CURRENT (A) Figure 2. ADP2119 Efficiency vs. Output Current One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2010–2012 Analog Devices, Inc. All rights reserved. ADP2119/ADP2120 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Typical Application Circuit ............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 5 Thermal Resistance ...................................................................... 5 Boundary Condition .................................................................... 5 ESD Caution.................................................................................. 5 Pin Configuration and Function Descriptions............................. 6 Typical Performance Characteristics ............................................. 7 Functional Block Diagram ............................................................ 15 Theory of Operation ...................................................................... 16 Control Scheme .......................................................................... 16 PWM Mode Operation.............................................................. 16 PFM Mode Operation................................................................ 16 Slope Compensation .................................................................. 16 Enable/Shutdown ....................................................................... 16 REVISION HISTORY 8/12—Rev. 0 to Rev. A Change t.


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