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ADP1874ARQZ-0.6-R7 Datasheet(PDF) 1 Page - Analog Devices |
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ADP1874ARQZ-0.6-R7 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 44 page  Synchronous Buck Controller with Constant On-Time and Valley Current Mode ADP1874/ADP1875 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other 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 ©2011 Analog Devices, Inc. All rights reserved. FEATURES Power input voltage range: 2.95 V to 20 V On-board bias regulator Minimum output voltage: 0.6 V 0.6 V reference voltage with ±1.0% accuracy Supports all N-channel MOSFET power stages Available in 300 kHz, 600 kHz, and 1.0 MHz options No current-sense resistor required Power saving mode (PSM) for light loads (ADP1875 only) Resistor programmable current limit Power good with internal pull-up resistor Externally programmable soft start Thermal overload protection Short-circuit protection Standalone precision enable input Integrated bootstrap diode for high-side drive Starts into a precharged output Available in a 16-lead QSOP package APPLICATIONS Telecom and networking systems Mid- to high-end servers Set-top boxes DSP core power supplies GENERAL DESCRIPTION The ADP1874/ADP1875 are versatile current mode, synchronous step-down controllers. They provide superior transient response, optimal stability, and current-limit protection by using a constant on-time, pseudo fixed frequency with a programmable current limit, current control scheme. In addition, these devices offer optimum performance at low duty cycles by using a valley, current mode control architecture. This allows the ADP1874/ADP1875 to drive all N-channel power stages to regulate output voltages to as low as 0.6 V. The ADP1875 is the power saving mode (PSM) version of the device and is capable of pulse skipping to maintain output regulation while achieving improved system efficiency at light loads (see the ADP1875 Power Saving Mode (PSM) section for more information). Available in three frequency options (300 kHz, 600 kHz, and 1.0 MHz, plus the PSM option), the ADP1874/ADP1875 are well suited for a wide range of applications that require a single-input power supply range from 2.95 V to 20 V. Low voltage biasing is supplied via a 5 V internal low dropout regulator (LDO). TYPICAL APPLICATIONS CIRCUIT COMP BST FB DRVH GND SW VREG VREG_IN RES DRVL SS CSS PGND VIN CC CVREG CVREG2 CC2 RC RBOT RTOP VOUT EN 10kΩ VREG Q1 Q2 L COUT VOUT CBST LOAD CIN VIN = 2.95V TO 20V ADP1874/ ADP1875 RRES RTRK1 PGOOD RPGD VEXT TRACK RTRK2 VMASTER Figure 1. Typical Applications Circuit 100 95 90 85 80 75 70 65 60 55 50 45 40 35 30 25 10 100 1k 10k 100k LOAD CURRENT (mA) TA = 25°C VOUT = 1.8V fSW = 300kHz WÜRTH INDUCTOR: 744325120, L = 1.2µH, DCR = 1.8mΩ INFINEON FETs: BSC042N03MS G (UPPER/LOWER) VIN = 5V (PSM) VIN = 13V (PSM) VIN = 16.5V (PSM) VIN = 13V VIN = 16.5V Figure 2. ADP1874/ADP1875 Efficiency vs. Load Current (VOUT = 1.8 V, 300 kHz) In addition, soft start programmability is included to limit input in- rush current from the input supply during startup and to provide reverse current protection during precharged output conditions. The low-side current sense, current gain scheme, and integration of a boost diode, along with the PSM/forced pulse- width modulation (PWM) option, reduce the external part count and improve efficiency. The ADP1874/ADP1875 operate over the −40°C to +125°C junction temperature range and are available in a 16-lead QSOP package. |
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