50 mA/500 mA, High Efficiency,

Ultralow Power Step-Down Regulator

Data Sheet

ADP5301

Rev. A

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FEATURES

Input start-up voltage range: 2.15 V to 6.50 V

Operates down to 2.00 V voltage

Ultralow 180 nA quiescent current with no load

Selectable output voltage of 1.2 V to 3.6 V or 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

100% duty cycle operation mode

2 MHz switching frequency with optional synchronization

input from 1.2 MHz to 2.5 MHz

QOD option

UVLO, OCP, and TSD protection

9-ball, 1.65 mm × 1.87 mm WLCSP

−40°C to +125°C junction temperature

APPLICATIONS

Energy (gas and 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

ADP5301

(9-BALL WLCSP)

HYS

OFF

ON

VOUTOK

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

Figure 1.

GENERAL DESCRIPTION

The ADP5301 is a high efficiency, ultralow quiescent current

step-down regulator that draws only a 180 nA quiescent current

to regulate the output at no load.

The ADP5301 runs from an input startup voltage range of 2.15 V

to 6.50 V, allowing the use of multiple alkaline/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 ADP5301 can operate between hysteresis mode and 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 ADP5301 contains a VOUTOK flag, which monitors the

output voltage and runs at a 2 MHz switching frequency in

PWM mode. SYNC/MODE can synchronize to an external

clock from 1.2 MHz to 2.5 MHz.

Other key features in the ADP5301 include separate enabling,

quick output discharge (QOD), and safety features such as

overcurrent protection (OCP), thermal shutdown (TSD), and

input undervoltage lockout (UVLO).

The ADP5301 is available in a 9-ball, 1.65 mm × 1.87 mm

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