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ADP1829ACPZ-R7 Datasheet(PDF) 1 Page - Analog Devices |
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ADP1829ACPZ-R7 Datasheet(HTML) 1 Page - Analog Devices |
1 / 32 page Dual, Interleaved, Step-Down DC-to-DC Controller with Tracking ADP1829 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 ©2007 Analog Devices, Inc. All rights reserved. FEATURES Fixed frequency operation: 300 kHz, 600 kHz, or synchronized operation up to 1 MHz Supply input range: 3.0 V to 18 V Wide power stage input range: 1 V to 24 V Interleaved operation results in smaller, low cost input capacitor All-N-channel MOSFET design for low cost ±0.85% accuracy at 0 °C to 70°C Soft start, thermal overload, current-limit protection 10 μA shutdown supply current Internal linear regulator Lossless RDSON current-limit sensing Reverse current protection during soft start for handling precharged outputs Independent Power OK outputs Voltage tracking for sequencing or DDR termination Available in 5 mm × 5 mm, 32-lead LFCSP APPLICATIONS Telecommunications and networking systems Medical imaging systems Base station power Set-top boxes Printers DDR termination TYPICAL APPLICATION CIRCUIT PV IN GND EN1 EN2 BST2 SW2 DH2 CSL2 DL2 PGND2 FB2 COMP2 FREQ LDOSD SYNC TRK1 TRK2 VREG BST1 DH1 SW1 CSL1 DL1 PGND1 FB1 COMP1 ADP1829 180µF 180µF 3900pF 390pF IRFR3709Z IRFR3709Z IRLR7807Z IRLR7807Z 1.2V, 6A 1.8V, 8A 390pF 3900pF VIN = 12V 560µF 560µF 2.2µH 2.2µH 1µF 0.47µF 0.47µF 4.53kΩ 4.53kΩ 1kΩ 2kΩ 2kΩ 2kΩ 2kΩ 2kΩ Figure 1. GENERAL DESCRIPTION The ADP1829 is a versatile, dual, interleaved, synchronous PWM buck controller that generates two independent output rails from an input of 3.0 V to 18 V, with power input voltage ranging from 1.0 V to 24 V. Each controller can be configured to provide output voltages from 0.6 V to 85% of the input voltage and is sized to handle large MOSFETs for point-of-load regulators. The two channels operate 180° out of phase, reducing stress on the input capacitor and allowing smaller, low cost components. The ADP1829 is ideal for a wide range of high power applications, such as DSP and processor core I/O power, and general-purpose power in telecommunications, medical imaging, PC, gaming, and industrial applications. The ADP1829 operates at a pin-selectable, fixed switching frequency of either 300 kHz or 600 kHz, minimizing external component size and cost. For noise-sensitive applications, it can also be synchronized to an external clock to achieve switching frequencies between 300 kHz and 1 MHz. The ADP1829 includes soft start protection to prevent inrush current from the input supply during startup, reverse current protection during soft start for precharged outputs, as well as a unique adjustable lossless current-limit scheme utilizing external MOSFET sensing. For applications requiring power supply sequencing, the ADP1829 also provides tracking inputs that allow the output voltages to track during startup, shutdown, and faults. This feature can also be used to implement DDR memory bus termination. The ADP1829 is specified over the −40°C to +125°C junction temperature range and is available in a 32-lead LFCSP package. |
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