50 mA/500 mA, Ultralow Power Step-Down

Regulator With Battery Voltage Monitor

Data Sheet

ADP5303

Rev. B

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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 load

Selectable 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 mode

Output current

Up to 50 mA in hysteresis mode

Up to 500 mA in PWM mode

VINOK flag to monitor input battery voltage

100% duty cycle operation mode

2 MHz switching frequency with optional synchronization

input from 1.5 MHz to 2.5 MHz

Quick 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

APPLICATIONS

Energy (gas, water) metering

Portable and battery-powered equipment

Medical applications

Keep-alive power supply

TYPICAL APPLICATION CIRCUIT

PWM

2.2µH

SW

PGND

FB

10µF

10µF

PVIN

SYNC/

MODE

EN

VID

2.15V TO 6.50V

ADP5303

(WLCSP-9)

HYS

R0

OFF

ON

VID0: 1.2V

VID1: 1.5V

VID2: 1.8V

VID3: 2.0V

VID4: 2.1V

VID5: 2.2V

VID6: 2.3V

VID7: 2.4V

VID8: 2.5V

VID9: 2.6V

VID10: 2.7V

VID11: 2.8V

VID12: 2.9V

VID13: 3.0V

VID14: 3.3V

VID15: 3.6V

AGND

VINOK

Figure 1.

GENERAL 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 PWM

mode 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 management

to 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 frequency

in PWM mode and the SYNC/MODE pin can be synchronized

to an external clock from 1.5 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 mm

WLCSP package rated for the −40°C to +125°C junction

temperature range.