LTC3588-1 Datasheet, PDF (7/20 Pages) Linear Technology – Piezoelectric Energy Harvesting Power Supply

LTC3588-1
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 V_IN to serve as gate
drive for buck PMOS switch. A 1μF capacitor should be
connected between CAP and V_IN. This pin is not intended
for use as an external system rail.
V_IN (Pin 4): Rectified Input Voltage. A capacitor on this
pin serves as an energy reservoir and input supply for the
buck regulator. The V_IN voltage is internally clamped to a
maximum of 20V (typical).
SW (Pin 5): Switch Pin for the Buck Switching Regulator.
A 10μH or larger inductor should be connected from SW
to V_OUT.
V_OUT (Pin 6): Sense pin used to monitor the output volt-
age and adjust it through internal feedback.
V_IN2 (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 4.7μF capacitor
should be connected from V_IN2 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 V_IN2 or low to GND to select desired V_OUT (see
Table 1).
D0 (Pin 9): Output Voltage Select Bit. D0 should be tied
high to V_IN2 or low to GND to select desired V_OUT (see
Table 1).
PGOOD (Pin 10): Power good output is logic high when
V_OUT is above 92% of the target value. The logic high is
referenced to the V_OUT 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 LTC3588-1.
35881f
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