Ultralow Power Step-Down Regulator

for Energy Harvesting

Data Sheet

ADP5304

Rev. 0

Document Feedback

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother

rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

©2015 Analog Devices, Inc. All rights reserved.

Technical Support

www.analog.com

FEATURES

Input supply voltage range: 2.15 V to 6.50 V

Operation down to 2.00 V typical

Ultralow, 260 nA typical quiescent current with no load

Selective output voltage from 1.2 V to 3.6 V (or 0.8 V to 5.0 V)

±2.5% output accuracy over the full temperature range

Output current up to 50 mA in hysteresis mode

VINOK flag to monitor the input voltage

100% duty cycle operation mode

Quick output discharge (QOD) option

Undervoltage lockout (UVLO), overcurrent protection (OCP),

and thermal shutdown (TSD) protection

10-lead, 3 mm × 3 mm LFCSP package

−40°C to +125°C operating junction temperature range

APPLICATIONS

Energy (gas, water) metering

Energy harvesting applications

Portable and battery-powered equipment

Medical applications

Keep-alive power supply

TYPICAL APPLICATION CIRCUIT

2.2µH

SW

PGND

FB

10µF

10µF

PVIN

MODE

EN

VID

ADP5304

R0

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

NC

VINOK

Figure 1.

GENERAL DESCRIPTION

The ADP5304 is a high efficient, ultralow quiescent current

step-down regulator that draws only 260 nA of quiescent

current to regulate the output at no load.

The ADP5304 runs from an input voltage range of 2.15 V to

6.50 V, allowing the use of the multiple alkaline, NiMH, and

Lithium cells, or the use of a high impedance power source. The

output voltage is selectable from 0.8 V to 5.0 V by an external

VID resistor to ground. The total solution requires only four

tiny external components.

The ADP5304 operates in hysteresis mode via connecting the

MODE pin to ground. In hysteresis mode, the regulator

achieves excellent efficiency at a power of less than 1 mW and

provides up to 50 mA of output load. The device enables very

efficient power management to achieve the collection of small

amounts of energy from the high impedance battery or the

energy harvester to charge up the conventional capacitor or

super capacitor.

The ADP5304 integrates an ultralow power comparator with a

factory programmable voltage reference to monitor the voltage

of the input power source. The voltage reference, with hysteresis, is

the threshold for the stopping and the starting of the switching,

allowing the use of the high impedance power source.

Other key features of the ADP5304 include separate enabling

and a QOD. Safety features, such as OCP, TSD, and input

UVLO are also included.

The ADP5304 is available in 10-lead, 3 mm × 3 mm LFCSP

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