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ADP2118ACPZ-3.3-R7 Datasheet(PDF) 1 Page - Analog Devices |
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ADP2118ACPZ-3.3-R7 Datasheet(HTML) 1 Page - Analog Devices |
1 / 24 page 3 A, 1.2 MHz/600 kHz High Efficiency Synchronous Step-Down DC-to-DC Converter ADP2118 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. 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 ©2009 Analog Devices, Inc. All rights reserved. FEATURES 3 A continuous output current 75 mΩ and 40 mΩ integrated FET ±1.5% output accuracy Input voltage range from 2.3 V to 5.5 V Output voltage from 0.6 V to VIN 600 kHz or 1.2 MHz fixed switching frequency Synchronizable between 600 kHz and 1.4 MHz Selectable synchronize phase shift: 0o or 180o Selectable PWM or PFM mode operation Current mode architecture Precision enable input Power good output Voltage tracking input Integrated soft start Internal compensation Starts up into a precharged output UVLO, OVP, OCP, and thermal shutdown Available in 16-lead 4mm × 4mm LFCSP_WQ package APPLICATIONS DSP/FPGA/ASIC core power Telecommunication/networking equipment PDAs and palmtop computers Audio/video consumer electronics GENERAL DESCRIPTION The ADP2118 is a low quiescent current, synchronous, step-down, dc-to-dc converter in a compact 4mm × 4mm LFCSP_WQ package. It uses a current mode, constant frequency pulse-width modulation (PWM) control scheme for excellent stability and transient response. Under light loads, the ADP2118 can be configured to operate in pulse frequency modulation (PFM) mode that reduces switching frequency to save power. The ADP2118 runs from input voltages of 2.3 V to 5.5 V. The output voltage of the ADP2118ACPZ-R7 is adjustable from 0.6 V to input voltage (VIN), and the ADP2118ACPZ-x.x-R7 are 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 ADP2118 requires minimal external parts and provides a high efficiency solution with its integrated power switch, synchronous rectifier, and internal compensation. The IC draws less than 3 μA 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 (OCP), and thermal shutdown (TSD). RTOP 10kΩ RBOT 2.21kΩ R2 10kΩ R1 10Ω SYNC/MODE FREQ TRK FB PVIN ADP2118 SW SW SW 1 2 3 4 12 11 10 9 CIN 100µF X5R, 6.3V COUT 100µF X5R, 6.3V C1 0.1µF VIN 5V VOUT 3.3V 3A L 1µH 16 15 14 13 5 6 7 8 Figure 1. Typical Applications Circuit 0 10 20 30 40 50 60 70 80 90 100 0.01 0.1 1 10 OUTPUT CURRENT (A) VIN = 5V VOUT = 3.3V fS = 1.2MHz PFM OPERATION FPWM OPERATION Figure 2. Efficiency vs. Output Current |
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