50 mA/500 mA, High Efficiency, Ultralow

Power Step-Down Regulator

Data Sheet

ADP5300

Rev. 0

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FEATURES

Input supply voltage range: 2.15 V to 6.50 V

Operates down to 2.00 V voltage

Ultralow 180 nA quiescent current

Selectable output voltage of 0.8 V to 5.0 V

±1.5% output accuracy over full temperature range in

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

VOUTOK flag monitors the output voltage

Ultrafast stop switching control

100% duty cycle operation mode

2.0 MHz typical switching frequency in PWM mode with

optional SYNC clock range from 1.2 MHz to 2.5 MHz

Quick output discharge (QOD) option

UVLO, OCP, and TSD protection

10-lead, 3 mm × 3 mm LFCSP

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

APPLICATIONS

Energy (gas and water) metering

Portable and battery-powered equipment

Medical applications

Keep-alive power supplies

TYPICAL APPLICATION CIRCUIT

2.2µH

SW

PGND

FB

10µF

10µF

PVIN

VID

ADP5300

R0

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

EN

OFF

ON

PWM

SYNC/MODE

HYS

STOP

STOP

SW

VOUTOK

AGND

Figure 1.

GENERAL DESCRIPTION

The ADP5300 is a high efficiency, ultralow quiescent current

step-down regulator that draws only 180 nA quiescent current

to regulate the output.

The ADP5300 runs from an input supply voltage range of 2.15 V

to 6.50 V, allowing the use of multiple alkaline or NiMH, 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 factory fuse. The

total solution requires only four tiny external components.

The ADP5300 can operate between hysteresis mode and pulse-

width modulation (PWM) mode via the SYNC/MODE pin. The

regulator in hysteresis mode achieves excellent efficiency at a

power of less than 1 mW and provides up to 50 mA of output

current. The regulator in PWM mode 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 the longest battery

life and low system noise requirements.

The ADP5300 contains a VOUTOK flag, which monitors the

output voltage and runs at a 2 MHz switching frequency in

PWM mode. SYNC/MODE can be synchronized to an external

clock from 1.2 MHz to 2.5 MHz.

The ADP5300 includes an STOP pin that can disable the regulator

switching temporarily, in this way a quiet system environment

can be achieved to benefit noise sensitive circuitry, such as data

conversion, RF data transmisson, and analog sensing.

Other key features in the ADP5300 include separate enabling,

QOD, and safety features such as overcurrent protection (OCP),

thermal shutdown (TSD), and input undervoltage lockout (UVLO).

The ADP5300 is available in a 10-lead, 3 mm × 3 mm LFCSP

rated for a −40°C to +125°C operating temperature range.

Multifunction pin names may be referenced by their relevant

function only.