LTC3588-2_10 Datasheet, PDF(7/18 Page) Linear Technology – Piezoelectric Energy Harvesting Power Supply with 14V Minimum VIN

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LTC3588-2_10 Datasheet, PDF (7/18 Pages) Linear Technology – Piezoelectric Energy Harvesting Power Supply with 14V Minimum VIN

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LTC3588-2

Pin Functions

PZ1 (Pin 1): Input connection for piezoelectric element or

other AC source (used in conjunction with PZ2).

PZ2 (Pin 2): Input connection for piezoelectric element or

other AC source (used in conjunction with PZ1).

CAP (Pin 3): Internal rail referenced to VIN to serve as gate

drive for buck PMOS switch. A 1ÂµF capacitor should be

connected between CAP and VIN. This pin is not intended

for use as an external system rail.

VIN (Pin 4): Rectified Input Voltage. A capacitor on this

pin serves as an energy reservoir and input supply for the

buck regulator. The VIN voltage is internally clamped to a

maximum of 20V (typical).

SW (Pin 5): Switch Pin for the Buck Switching Regulator.

A 22ÂµH or larger inductor should be connected from SW

to VOUT.

VOUT (Pin 6): Sense pin used to monitor the output volt-

age and adjust it through internal feedback.

VIN2 (Pin 7): Internal low voltage rail to serve as gate drive

for buck NMOS switch. Also serves as a logic high rail for

output voltage select bits D0 and D1. A 4.7ÂµF capacitor

should be connected from VIN2 to GND. This pin is not

intended for use as an external system rail.

D1 (Pin 8): Output Voltage Select Bit. D1 should be tied

high to VIN2 or low to GND to select desired VOUT (see

Table 1).

D0 (Pin 9): Output Voltage Select Bit. D0 should be tied

high to VIN2 or low to GND to select desired VOUT (see

Table 1).

PGOOD (Pin 10): Power good output is logic high when

VOUT is above 92% of the target value. The logic high is

referenced to the VOUT rail.

GND (Exposed Pad Pin 11): Ground. The Exposed Pad

should be connected to a continuous ground plane on the

second layer of the printed circuit board by several vias

directly under the LTC3588-2.

Block Diagram

VIN 4

PZ1 1

PZ2 2

8, 9

D1, D0

20V

INTERNAL RAIL

GENERATION

UVLO

BUCK

CONTROL

BANDGAP

REFERENCE

SLEEP

3 CAP

5 SW

7 VIN2

11 GND

PGOOD

COMPARATOR

6 VOUT

10 PGOOD

35882 BD

35882fa

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