Ultralow Power Step-Down Regulator
for Energy Harvesting
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
Energy (gas, water) metering
Energy harvesting applications
Portable and battery-powered equipment
Keep-alive power supply
TYPICAL APPLICATION CIRCUIT
VIN = 2.15V TO 6.5V
VID0: 1.2V VID8: 2.5V
VID1: 1.5V VID9: 2.6V
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 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
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.
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