ADP5135

Data Sheet Triple 1800 mA Buck Regulator with Precision Enables and Power-Good Outputs ADP5135 12604-001 FEATURES Input voltage range: 3.0 V to 5.5 V Three 1800 mA buck regulators 24-lead, 4 mm × 4 mm LFCSP package Regulator accuracy: ±1.8% Factory programmable or external adjustable VOUTx pins Precision enables for easier power sequencing Power-good pins for monitoring each regulator 3 MHz buck operation with forced PWM and auto PWM/PSM modes BUCK1/BUCK2/BUCK3: output voltage range from 0.8 V to 3.8 V APPLICATIONS Power for processors, application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), and radio frequency (RF) chipsets Portable instrumentation and medical devices Space constrained devices GENERAL DESCRIPTION The ADP5135 combines three high performance buck regulators (BUCK1, BUCK2, and BUCK3). It is available in a 24-lead, 4 mm × 4 mm LFCSP. 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 pulse-width modulation (PWM) mode. When the MODE pin is set to low, the buck regulators operate in PWM mode only when the load is above a predefined threshold. When the load current falls below this predefined threshold, the regulator operates in power save mode (PSM), improving the light load efficiency. BUCK1 and BUCK2 operate in synchronization, and BUCK3 operates out of phase to reduce the input c...