Analog Devices ADP5303

Description

The ADP5303 is high efficiency, ultralow quiescent current step-down regulator that draws only 240 nA quiescent current to regulate the output at no load.The ADP5303 runs from an input voltage of 2.15 V to 6.50 V, allowing the use of multiple alkaline or NiMH cells, Li-Ion cells, or other power sources. The output voltage is selectable from 0.8 V to 5.0 V by an external VID resistor and a factory fuse. The total solution requires only four tiny external components. The ADP5303 can operate between hysteresis mode and PWMmode via the SYNC/MODE pin. In hysteresis mode, the regulator achieves excellent efficiency at less than 1 mW and provides up to 50 mA of output current. In PWM mode, the regulator produces a lower output ripple and supplies up to 500 mA of output current. The flexible configuration capability during operation of the device enables very efficient power managementto meet both long battery life and low system noise requirements.The ADP5303 integrates an ultralow power comparator with a factory programmable voltage reference to monitor the input battery voltage. The regulator runs at a 2 MHz switching frequencyin PWM mode and the SYNC/MODE pin can be synchronized to an external clock from 1.2 MHz to 2.5 MHz. Other key features in the ADP5303 include separate enabling,QOD, and safety features such as overcurrent protection (OCP),thermal shutdown (TSD), and input undervoltage lockout(UVLO).The ADP5303 is available in 9-ball, 1.65 mm × 1.87 mmWLCSP package rated for the −40°C to +125°C junction temperature range.

Features

Input supply voltage range: 2.15 V to 6.50 V Operates down to 2.00 V Ultralow 240 nA quiescent current with no loadSelectable output voltages of 1.2 V to 3.6 V, or 0.8 V to 5.0 V ±1.5% output accuracy over the full temperature range in pulse-width modulation (PWM) mode Selectable hysteresis mode or PWM operation modeOutput currentUp to 50 mA in hysteresis modeUp to 500 mA in PWM mode VINOK flag to monitor input battery voltage100% duty cycle operation mode 2 MHz switching frequency with optional synchronizationinput from 1.2 MHz to 2.5 MHzQuick output discharge (QOD) option UVLO, OCP, and TSD protection 9-ball, 1.65 mm × 1.87 mm WLCSP Junction temperature: −40°C to +125°C

Typical applications

• Energy (gas, water) metering
• Medical applications
• Portable and battery-powered equipment
• Keep-alive power supply

More information

• Datasheet
• IC product information