CBC3225T100MR datasheet(2/8 Pages) ETC2

部品番号	CBC3225T100MR

部品情報	ENERGY HARVESTING ELECTRONICS

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ELECTRICAL CHARACTERISTICS

PRINCIPLE OF OPERATION

2

REVISION N0. 002

REVISION DATE: 01-23-2013

The LTC3588-1 Piezoelectric Energy Harvesting Power

Supply from Linear Technology is the primary

component on the EHE004. From Linear Technology’s

datasheet:

“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 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.”

For more information on the LTC3588-1 please visit:

http://cds.linear.com/docs/Datasheet/35881fa.pdf

Referring to Figure 2b, The LTC3588-1 power supply IC

integrates an extremely low quiescent current voltage

comparator with a highly efficient buck regulator. The

buck regulator is activated when the rectified input

voltage, VCAP, rises above the pre-set undervoltage

lockout (UVLO) rising voltage threshold for the chosen

output voltage setting (Page 5 table ‘Specification’).

The regulator remains active until the input voltage has

been depleted to the UVLO falling threshold, at which

point the buck operation is disabled. Thus, for as long

as the load demand exceeds the input power (as in

typical sensor or battery charger applications), the

input voltage will hover between the UVLO rising and

falling thresholds. In cases where the input power

exceeds the load demand, the VCAP voltage will rise

beyond the UVLO rising threshold, storing the excess

power on the input capacitor. If the voltage at VCAP

exceeds approximately 20VDC, an internal voltage

clamp (5mA continuous rating) prevents damage to the

device.

EHE004

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