Nanopower Energy Harvesting Power Supply

The LTC3588-1 integrates a low-loss full-wave bridge rectifier with a high efficiency buck converter to form a complete energy harvesting solution optimized for high output impedance energy sources such as piezoelectric, solar, or magnetic transducers. An ultralow quiescent current undervoltage lockout (UVLO) mode with a wide hysteresis window allows charge to accumulate on an input capacitor until the buck converter can efficiently transfer a portion of the stored charge to the output. In regulation, the LTC3588-1 enters a sleep state in which both input and output quiescent currents are minimal. The buck converter turns on and off as needed to maintain regulation.

Four output voltages, 1.8V, 2.5V, 3.3V and 3.6V, are pin selectable with up to 100mA of continuous output current; however, the output capacitor may be sized to service a higher output current burst. An input protective shunt set at 20V enables greater energy storage for a given amount of input capacitance.

Output Voltage (Switcher)

UVLO

Quiescent Current

LTC3588-1

Selectable 1.8V, 2.5V, 3.3V or 3.6V

4.04V(Rising)

2.87V(Falling)

950nA (No Load)

450nA (UVLO)

LTC3588-2

Selectable 3.45V, 4.1V, 4.5V or 5V

16V(Rising)

14V(Falling)

1,500nA (No Load)

830nA (UVLO)

Applications

* Piezoelectric Energy Harvesting

* Electro-Mechanical Energy Harvesting

* Wireless HVAC Sensors

* Mobile Asset Tracking

* Tire Pressure Sensors

* Battery Replacement for Industrial Sensors

* Remote Light Switches

* Standalone Nanopower Buck Regulator

* 950nA Input Quiescent Current (Output in Regulation – No Load)* 450nA Input Quiescent Current in UVLO* 2.7V to 20V Input Operating Range* Integrated Low-Loss Full-Wave Bridge Rectifier* Up to 100mA of Output Current