Dual 3 MHz, 1200 mA Buck Regulators with Two 300 mA LDOs Data Sheet ADP5034 regulators operate in PWM mode when the load is above a pre- FEATURES defined threshold. When the load current falls below a predefined Main input voltage range: 2.3 V to 5.5 V threshold, the regulator operates in power save mode (PSM), Two 1200 mA buck regulators and two 300 mA LDOs improving the light load efficiency. 24-lead, 4 mm 4 mm LFCSP or 28-lead TSSOP package Regulator accuracy: 1.8% Table 1. Family Models Factory programmable or external adjustable VOUTx Maximum 3 MHz buck operation with forced PWM and auto PWM/PSM Current Model Channels Package modes ADP5023 2 Buck,1 LDO 800 mA, LFCSP (CP-24-10) 300 mA BUCK1/BUCK2: output voltage range from 0.8 V to 3.8 V ADP5024 2 Buck,1 LDO 1.2 A, LFCSP (CP-24-10) LDO1/LDO2: output voltage range from 0.8 V to 5.2 V 300 mA LDO1/LDO2: input supply voltage from 1.7 V to 5.5 V ADP5034 2 Buck,2 LDOs 1.2 A, LFCSP (CP-24-10), LDO1/LDO2: high PSRR and low output noise 300 mA TSSOP (RE-28-1) ADP5037 2 Buck,2 LDOs 800 mA, LFCSP (CP-24-10) APPLICATIONS 300 mA ADP5033 2 Buck,2 LDOs with 800 mA, WLCSP (CB-16-8) Power for processors, ASICS, FPGAs, and RF chipsets 2 EN pins 300 mA Portable instrumentation and medical devices Space constrained devices The two bucks operate out of phase to reduce the input capaci- tor requirement. The low quiescent current, low dropout voltage, GENERAL DESCRIPTION and wide input voltage range of the ADP5034 LDOs extend the The ADP5034 combines two high performance buck regulators battery life of portable devices. The ADP5034 LDOs maintain and two low dropout (LDO) regulators. It is available in either a power supply rejection greater than 60 dB for frequencies as 24-lead 4 mm 4 mm LFCSP or a 28-lead TSSOP package. high as 10 kHz while operating with a low headroom voltage. The high switching frequency of the buck regulators enables tiny Regulators in the ADP5034 are activated through dedicated multilayer external components and minimizes the board space. enable pins. The default output voltages can be externally set in When the MODE pin is set to high, the buck regulators operate in the adjustable version, or factory programmable to a wide range forced PWM mode. When the MODE pin is set to low, the buck of preset values in the fixed voltage version. TYPICAL APPLICATION CIRCUIT AVIN HOUSEKEEPING C AVIN VOUT1 0.1F L1 1H VIN1 SW1 2.3V TO V AT OUT1 5.5V C1 1200mA R1 FB1 4.7F BUCK1 C5 R2 10F PGND1 ON EN1 EN1 OFF MODE PWM MODE PSM/PWM VOUT2 VIN2 MODE L2 1H SW2 C2 V AT OUT2 4.7F 1200mA R3 BUCK2 FB2 C6 EN2 R4 10F EN2 PGND2 EN3 VOUT3 V AT OUT3 EN3 LDO1 300mA R5 VIN3 FB3 1.7V TO (ANALOG) C7 5.5V C3 1F R6 1F EN4 ON VOUT4 V AT EN4 OUT4 OFF 300mA LDO2 R7 VIN4 FB4 (DIGITAL) C8 1F C4 R8 1F ADP5034 AGND Figure 1. Rev. E Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20112013 Analog Devices, Inc. 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Technical Support www.analog.com 09703-001ADP5034 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Theory of Operation ...................................................................... 16 Applications ....................................................................................... 1 Power Management Unit ........................................................... 16 General Description ......................................................................... 1 BUCK1 and BUCK2 .................................................................. 18 Typical Application Circuit ............................................................. 1 LDO1 and LDO2 ........................................................................ 19 Revision History ............................................................................... 3 Applications Information .............................................................. 20 Specifications ..................................................................................... 4 Buck External Component Selection ....................................... 20 General Specifications ................................................................. 4 LDO External Component Selection....................................... 22 BUCK1 and BUCK2 Specifications ........................................... 5 Power Dissipation and Thermal Considerations ....................... 23 LDO1 and LDO2 Specifications ................................................. 5 Buck Regulator Power Dissipation .......................................... 23 Input and Output Capacitor, Recommended Specifications .. 6 Junction Temperature ................................................................ 24 Absolute Maximum Ratings ............................................................ 7 PCB Layout Guidelines .................................................................. 25 Thermal Resistance ...................................................................... 7 Typical Application Schematics .................................................... 26 ESD Caution .................................................................................. 7 Bill of Materials ........................................................................... 26 Pin Configuration and Function Descriptions ............................. 8 Outline Dimensions ....................................................................... 27 Typical Performance Characteristics ............................................. 9 Ordering Guide .......................................................................... 28 Rev. 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