50 mA/500 mA, High Efficiency, Ultralow
Power Step-Down Regulator
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
Selectable hysteresis mode or PWM operation mode
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 1.5 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
Energy (gas and water) metering
Portable and battery-powered equipment
Keep-alive power supplies
The ADP5300 is a high efficiency, ultralow quiescent current
step-down regulatorthat draws only 180 nA quiescent current
to regulate the output.
The ADP5300 runs from an inputsupplyvoltage range of 2.15 V
to 6.50 V, allowing the use ofmultiple alkaline orNiMH, Li-Ion
cells, or otherpowersources.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 fourtiny external components.
The ADP5300 can operate betweenhysteresis mode and pulse-
width modulation (PWM) mode viathe 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 producesa lower output
ripple and suppliesupto 500 mAof output current.The flexible
configuration capability during operationofthe device enables
very efficientpowermanagement to meetboth the longest battery
life and low system noise requirements.
TYPICAL APPLICATION CIRCUIT
VIN = 2.15 TO 6.50V
VID0: 1.2V VID8: 2.5V
VID1: 1.5V VID9: 2.6V
VID2: 1.8V VID10: 2.7V
VID3: 2.0V VID11: 2.8V
VID4: 2.1V VID12: 2.9V
VID5: 2.2V VID13: 3.0V
VID6: 2.3V VID14: 3.3V
VID7: 2.4V VID15: 3.6V
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 1.5 MHz to 2.5 MHz.
The ADP5300 includes anSTOP pinthat candisable 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 inputundervoltage 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
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