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ADP5034 Arkusz danych(PDF) 1 Page - Analog Devices |
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ADP5034 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 28 page Dual 3 MHz, 1200 mA Buck Regulators with Two 300 mA LDOs Data Sheet ADP5034 Rev. A 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 Main input voltage range: 2.3 V to 5.5 V Two 1200 mA buck regulators and two 300 mA LDOs 24-lead, 4 mm × 4 mm LFCSP package Regulator accuracy: ±3% Factory programmable or external adjustable VOUTx 3 MHz buck operation with forced PWM and auto PWM/PSM modes BUCK1/BUCK2: output voltage range from 0.8 V to 3.8 V LDO1/LDO2: output voltage range from 0.8 V to 5.2 V LDO1/LDO2: low input supply voltage from 1.7 V to 5.5 V LDO1/LDO2: high PSRR and low output noise APPLICATIONS Power for processors, ASICS, FPGAs, and RF chipsets Portable instrumentation and medical devices Space constrained devices GENERAL DESCRIPTION The ADP5034 combines two high performance buck regulators and two low dropout (LDO) regulators in a small, 24-lead 4 mm × 4 mm LFCSP to meet demanding performance and board space requirements. The high switching frequency of the buck regulators enables tiny multilayer external components and minimizes the board space. When the MODE pin is set to high, the buck regulators operate in forced PWM mode. When the MODE pin is set to low, the buck regulators operate in PWM mode when the load is above a pre- defined threshold. When the load current falls below a predefined threshold, the regulator operates in power save mode (PSM), improving the light load efficiency. The two bucks operate out of phase to reduce the input capaci- tor requirement. The low quiescent current, low dropout voltage, and wide input voltage range of the ADP5034 LDOs extend the battery life of portable devices. The ADP5034 LDOs maintain power supply rejection greater than 60 dB for frequencies as high as 10 kHz while operating with a low headroom voltage. Regulators in the ADP5034 are activated through dedicated enable pins. The default output voltages can be externally set in the adjustable version, or factory programmable to a wide range of preset values in the fixed voltage version. TYPICAL APPLICATION CIRCUIT VIN1 VIN3 EN1 PWM PSM/PWM 2.3V TO 5.5V SW1 FB1 R2 R1 VOUT1 PGND1 MODE C5 10µF VOUT1 AT 1200mA VOUT2 AT 1200mA VOUT3 AT 300mA VOUT4 AT 300mA L1 1µH EN1 BUCK1 MODE C3 1µF C2 4.7µF C1 4.7µF AVIN CAVIN 0.1µF C4 1µF VIN2 EN2 AGND EN2 BUCK2 MODE EN3 1.7V TO 5.5V EN4 VIN4 ON OFF ON OFF EN3 LDO1 (ANALOG) ADP5034 HOUSEKEEPING SW2 FB2 R4 R3 VOUT2 PGND2 C6 10µF L2 1µH FB3 R6 R5 VOUT3 C7 1µF FB4 R8 R7 VOUT4 C8 1µF EN4 LDO2 (DIGITAL) Figure 1. |
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