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ADP2106 Arkusz danych(PDF) 1 Page - Analog Devices |
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ADP2106 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 36 page 1 Amp/1.5 Amp/2 Amp Synchronous, Step-Down DC-to-DC Converters Data Sheet ADP2105/ADP2106/ADP2107 Rev. D Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother 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 ©2006–2012 Analog Devices, Inc. All rights reserved. FEATURES Extremely high 97% efficiency Ultralow quiescent current: 20 μA 1.2 MHz switching frequency 0.1 μA shutdown supply current Maximum load current ADP2105: 1 A ADP2106: 1.5 A ADP2107: 2 A Input voltage: 2.7 V to 5.5 V Output voltage: 0.8 V to V IN Maximum duty cycle: 100% Smoothly transitions into low dropout (LDO) mode Internal synchronous rectifier Small 16-lead 4 mm × 4 mm LFCSP_VQ package Optimized for small ceramic output capacitors Enable/shutdown logic input Undervoltage lockout Soft start Supported by ADIsimPower™ design tool APPLICATIONS Mobile handsets PDAs and palmtop computers Telecommunication/networking equipment Set top boxes Audio/video consumer electronics GENERAL DESCRIPTION The ADP2105/ADP2106/ADP2107 are low quiescent current, synchronous, step-down dc-to-dc converters in a compact 4 mm × 4 mm LFCSP_VQ package. At medium to high load currents, these devices use a current mode, constant frequency pulse- width modulation (PWM) control scheme for excellent stability and transient response. To ensure the longest battery life in portable applications, the ADP2105/ADP2106/ADP2107 use a pulse frequency modulation (PFM) control scheme under light load conditions that reduces switching frequency to save power. The ADP2105/ADP2106/ADP2107 run from input voltages of 2.7 V to 5.5 V, allowing single Li+/Li− polymer cell, multiple alkaline/NiMH cells, PCMCIA, and other standard power sources. The output voltage of ADP2105/ADP2106/ADP2107 is adjustable from 0.8 V to the input voltage (indicated by ADJ), whereas the ADP2105/ADP2106/ADP2107 are available in preset output voltage options of 3.3 V, 1.8 V, 1.5 V, and 1.2 V (indicated by x.x V). Each of these variations is available in three maximum current levels: 1 A (ADP2105), 1.5 A (ADP2106), and 2 A (ADP2107). The power switch and synchronous rectifier are integrated for minimal external part count and high efficiency. During logic controlled shutdown, the input is disconnected from the output, and it draws less than 0.1 µA from the input source. Other key features include undervoltage lockout to prevent deep battery discharge and programmable soft start to limit inrush current at startup. TYPICAL OPERATING CIRCUIT ADP2107-ADJ OFF EN SS LX2 FB PWIN1 AGND OUTPUT VOLTAGE = 2.5V COMP ON PGND IN GND GND GND NC GND LX1 PWIN2 VIN VIN INPUT VOLTAGE = 2.7V TO 5.5V 10μF FB 1nF 70kΩ 120pF 1 2 3 4 12 11 10 9 16 15 14 13 5 6 7 8 2μH 4.7μF LOAD 0A TO 2A 10μF 10μF 10Ω 0.1μF NC = NO CONNECT 85kΩ 40kΩ FB Figure 1. Circuit Configuration of ADP2107 with VOUT = 2.5 V 100 75 0 2000 LOAD CURRENT (mA) 95 90 85 80 200 400 600 800 1000 1200 1400 1600 1800 VIN = 3.3V VIN = 3.6V VIN = 5V VOUT = 2.5V Figure 2. Efficiency vs. Load Current for the ADP2107 with VOUT = 2.5 V |
Podobny numer części - ADP2106_15 |
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Podobny opis - ADP2106_15 |
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