50 mA/500 mA, Ultralow Power Step-Down

Regulator with Battery Voltage Monitor

Data Sheet

ADP5302

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

Ultrafast stop switching control

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

10-lead, 3 mm × 3 mm LFCSP package

Junction temperature: −40°C to +125°C

APPLICATIONS

Energy (gas, water) metering

Portable and battery-powered equipment

Medical applications

Keep-alive power supplies

TYPICAL APPLICATION CIRCUIT

PWM

2.2µH

SW

PGND

FB

10µF

10µF

PVIN

SYNC/

MODE

EN

VID

2.15V TO 6.50V

ADP5302

(LFCSP-10)

HYS

R0

STOP

SW

OFF

ON

AGND

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

EPAD

VINOK

STOP

Figure 1.

GENERAL DESCRIPTION

The ADP5302 is a high efficiency, ultralow quiescent current

step-down regulator that draws only 240 nA quiescent current

to regulate the output at no load.

The ADP5302 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, dynamic voltage identification (VID)

resistor and a factory fuse. The total solution requires only four

tiny external components.

The ADP5302 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 ADP5302 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.

The ADP5302 includes an extra STOP pin that can temporarily

disable the regulator switching; in this way, a quiet system environ-

ment can be achieved to benefit the noise sensitive circuitry, which

includes data conversion, RF data transmission, and analog sensors.

Other key features in the ADP5302 include separate enabling,

QOD, and safety features, such as overcurrent protection

(OCP), thermal shutdown (TSD), and input undervoltage

lockout (UVLO).

The ADP5302 is available in a 10-lead, 3 mm × 3 mm LFCSP

package rated for the −40°C to +125°C junction temperature range.