LTC4071 datasheet(10/20 Pages) LINER

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LTC3330

3330p

For more information www.linear.com/LTC3330

pin FuncTions

BAL (Pin 1): Supercapacitor Balance Point. The common

node of a stack of two supercapacitors is connected to

BAL. A source/sink balancing current of up to 10mA is

available. Tie BAL along with SCAP to GND to disable the

balancer and its associated quiescent current.

SCAP (Pin 2): Supply and Sense Point for Supercapacitor

Balancer. Tie the top of a 2-capacitor stack to SCAP and

the middle of the stack to BAL to activate balancing. Tie

SCAP along with BAL to GND to disable the balancer and

its associated quiescent current.

VIN2 (Pin 3): Internal Low Voltage Rail to Serve as Gate

Drive for Buck NMOS Switch. Connect a 4.7µF (or larger)

capacitor from VIN2 to GND. This pin is not intended for

use as an external system rail.

UV3, UV2, UV1, UV0 (Pins 4, 5, 6, 7): UVLO Select Bits

for the Buck Switching Regulator. Tie high to VIN2 or

low to GND to select the desired UVLO rising and falling

thresholds (see Table 4). Do not float.

AC1 (Pin 8): Input Connection for Piezoelectric Element

or Other AC Source (used in conjunction with AC2 for

differential AC inputs).

AC2 (Pin 9): Input Connection for Piezoelectric Element

or Other AC Source (used in conjunction with AC1 for

differential AC inputs).

VIN (Pin 10): 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).

CAP (Pin 11): Internal Rail Referenced to VIN to Serve

as Gate Drive for Buck PMOS Switch. Connect a 1μF (or

larger) capacitor between CAP and VIN. This pin is not

intended for use as an external system rail.

SW (Pin 12): Switch Node for the Buck Switching Regula-

tor. Connect a 22µH or greater external inductor between

this node and VOUT.

VOUT (Pin 13): Regulated Output Voltage Derived from the

Buck or Buck-Boost Switching Regulator.

SWB (Pin 14): Switch Node for the Buck-Boost Switching

Regulator.Connectanexternalinductorbetweenthisnode

and SWA of value per Table 3.

SWA (Pin 15): Switch Node for the Buck-Boost Switching

Regulator.Connectanexternalinductorbetweenthisnode

and SWB of value per Table 3.

BAT (Pin 16): Input for Battery. BAT serves as the input

to the buck-boost switching regulator.

IPK0, IPK1, IPK2 (Pins 17, 18, 19): IPEAK Select Bits

for the Buck-Boost Switching Regulator. Tie high to VIN3

or low to GND to select the desired IPEAK (see Table 3).

Do not float.

LDO_OUT (Pin 20): Regulated LDO Output. This output

can be used as a quiet supply. One mode is provided to run

the LDO as a current limited switch to alternately power

up and power down circuitry without low power modes.

LDO_IN (Pin 21): Input Voltage for the LDO regulator.

LDO2, LDO1, LDO0 (Pins 22, 23, 24): LDO Voltage Select

Bits. Tie high to LDO_IN or low to GND to select the desired

LDO_OUT voltage (see Table 2). Do not float.

LDO_EN(Pin25):LDOEnableInput.Activehighinputwith

logic levels referenced to LDO_IN. Do not float.

VIN3 (Pin 26): Internal Low Voltage Rail Used by the Priori-

tizer. Connect a 1µF (or larger) capacitor from VIN3 to GND.

This pin is not intended for use as an external system rail.

PGLDO (Pin 27): Power Good Output for LDO_OUT. Logic

level output referenced to an internal maximum rail (see

Operation). PGLDO transitioning high indicates 92.5%

(typical)regulationhasbeenreachedonLDO_OUT.PGLDO

remains high until LDO_OUT falls to 90.0% (typical) of

the programmed regulation point.

PGVOUT (Pin 28): Power Good Output for VOUT. Logic

level output referenced to an internal maximum rail (see

Operation). PGVOUT transitioning high indicates regula-

tion has been reached on VOUT (VOUT = Sleep Rising).

PGVOUT remains high until VOUT falls to 92.5% (typical)

of the programmed regulation point.

BAT_ON (Pin 29): Switcher Status. Logic level output

referenced to VIN3. EH_ON is high when the buck switch-

ing regulator is in use. It is pulled low when buck-boost

switching regulator is in use.

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