DEMO MANUAL DC2048A LTC3330EUH Nanopower Buck-Boost DC/DC with Energy Harvesting Battery Life Extender Description Demonstration Circuit 2048A is a nanopower buck- battery to essentially zero. The buck-boost takes over boost DC/DC with energy harvesting battery life extender when harvested energy goes away. featuring the LTC 3330. The LTC3330 integrates a high A low noise LDO post regulator and a supercapacitor voltage energy harvesting power supply plus a DC/DC balancer are also integrated, accommodating a wide range converter powered by a primary cell battery to create a of output storage configurations. single output supply for alternative energy applications. Voltage and current settings for both input and outputs The energy harvesting power supply, consisting of an are programmable via pin-strapped logic inputs. integrated low-loss full-wave bridge with a high voltage buck converter, harvests energy from piezoelectric, solar The LTC3330EUH is available in a 5mm 5mm 32-lead or magnetic sources. The primary cell input powers a QFN surface mount package with exposed pad. buck-boost converter capable of operating down to 1.8V Design files for this circuit board are available at at its input. Either DC/DC converter can deliver energy to DEMO MANUAL DC2048A p s Specifications are at T = 25C A SYMBOL PARAMETER CONDITIONS MIN MAX UNITS V Input Voltage Range 3.0 18.0 V IN V Battery Voltage Range 1.8 5.5 V BAT V 1.8V Output Voltage Range OUT0 = 0, OUT1 = 0, OUT2 = 0 1.728 1.872 V OUT V 2.5V Output Voltage Range OUT0 = 1, OUT1 = 0, OUT2 = 0 2.425 2.575 V OUT V 2.8V Output Voltage Range OUT0 = 0, OUT1 = 1, OUT2 = 0 2.716 2.884 V OUT V 3.0V Output Voltage Range OUT0 = 1, OUT1 = 1, OUT2 = 0 2.910 3.090 V OUT V 3.3V Output Voltage Range OUT0 = 0, OUT1 = 0, OUT2 = 1 3.200 3.400 V OUT V 3.6V Output Voltage Range OUT0 = 1, OUT1 = 0, OUT2 = 1 3.492 3.708 V OUT V 4.5V Output Voltage Range OUT0 = 0, OUT1 = 1, OUT2 = 1 4.365 4.635 V OUT V 5.0V Output Voltage Range OUT0 = 1, OUT1 = 1, OUT2 = 1 4.850 5.150 V OUT LDO 1.2V LDO Voltage Range LDO0 = 0, LDO1 = 0, LDO2 = 0 1.176 1.224 V LDO 1.5V LDO Voltage Range LDO0 = 1, LDO1 = 0, LDO2 = 0 1.470 1.530 V LDO 1.8V LDO Voltage Range LDO0 = 0, LDO1 = 1, LDO2 = 0 1.764 1.836 V LDO 2.0V LDO Voltage Range LDO0 = 1, LDO1 = 1, LDO2 = 0 1.960 2.040 V LDO 2.5V LDO Voltage Range LDO0 = 0, LDO1 = 0, LDO2 = 1 2.450 2.550 V LDO 3.0V LDO Voltage Range LDO0 = 1, LDO1 = 0 ,LDO2 = 1 2.940 3.060 V LDO 3.3V LDO Voltage Range LDO0 = 0, LDO1 = 1, LDO2 = 1 3.234 3.366 V LDO LD0 IN LDO Voltage Range LDO0 = 1, LDO1 = 1, LDO2 = 1 LDO IN V o p Refer to the block diagram within the LTC3330 data sheet An internal full-wave bridge rectifier accessible via AC1 for its operating principle. and AC2 inputs, rectifies AC sources such as those from a piezoelectric element. The rectified output is stored on The LTC3330 combines a buck switching regulator and a capacitor at the V pin and can be used as an energy IN a buck-boost switching regulator to produce an energy reservoir for the buck converter. The bridge rectifier has harvesting solution with battery backup. The converters are a total drop of about 800mV at typical piezo-generated controlled by a prioritizer that selects which converter to currents, but is capable of carrying up to 50mA. use based on the availability of a battery and/or harvestable energy. If harvested energy is available, the buck regula- When the voltage on V rises above the UVLO rising IN tor is active and the buck-boost is off. With an optional threshold the buck converter is enabled and charge is LDO and supercapacitor balancer and an array of different transferred from the input capacitor to the output capaci- configurations, the LTC3330 suits many applications. tor. When the input capacitor voltage is depleted below the UVLO falling threshold the buck converter is disabled. The synchronous buck converter is an ultralow quiescent current power supply tailored to energy harvesting applica- These thresholds can be set according to Table 4 of the tions. It is designed to interface directly to a piezoelectric data sheet which offers UVLO rising thresholds from 4V or alternative A/C energy source, rectify and store the har- to 18V with large or small hysteresis windows. vested energy on an external capacitor while maintaining a Two internal rails, CAP and V , are generated from V and IN2 IN regulated output voltage. It can also bleed off any excess are used to drive the high side PMOS and low side NMOS input power via an internal protective shunt regulator. of the buck converter, respectively. Additionally the V IN2 dc2048afb 2 rinciple perating ummary erformance