LT3095 datasheet(9/22 Pages) LINER

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LT3095

3095fa

For more information www.linear.com/LT3095

PIN FUNCTIONS

GND (Pins 1, 5, 7, 14, 16, 20, Exposed Pad Pin 25):

Ground. Tie the exposed pad Pin 25 directly to all other

GND pins for optimum performance. The exposed pad

provides enhanced thermal performance with its connec-

tion to the PCB ground.

BSTOUT1 (Pin 2): Channel 1 Step-Up Regulator Output.

This pin is Channel 1’s boost converter output. Connect

BSTOUT1 directly to LDOIN1. Connect the boost output

capacitordirectlyfromBSTOUT1toPin1’sGND.Aninternal

feedback loop regulates BSTOUT1’s voltage typically to

(OUT1 + 2V). This optimizes transient response and PSRR

performance of the Linear Regulator.

NC (Pin 3): No Connect. Pin 3 has no internal electrical

connection and may be floated or tied to GND.

INTVCC (Pin 4): Internal Regulator Output. INTVCC powers

most of the internal circuitry for both channels. It nomi-

nally regulates to 2.7V. INTVCC is not designed to power

any external load and should not be driven. Connect a

minimum value 0.1µF or higher ceramic capacitor directly

from INTVCC to Pin 5’s GND.

LDOIN1(Pin6):Channel1LinearRegulatorInput. Thispin

is Channel 1’s linear regulator input supply pin. Connect

Pin 6 directly to BSTOUT1 at Pin 2.

OUT1 (Pin 8): Channel 1 Linear Regulator Output. This

pin supplies power to Channel 1’s load. Use a minimum

value 2.2µF ceramic capacitor with an ESR less than 0.1Ω

to prevent oscillations. Large load transient applications

require larger value output capacitors to limit peak volt-

age transients. See the applications information section

for more information on output capacitance. Connect the

output capacitor and the load directly to Pin 7’s GND.

SET1 (Pin 9): Output Voltage Set. This pin is the non-

inverting input to Channel 1’s LDO error amplifier and the

regulationsetpoint.Aprecision,trimmed50µAflowsoutof

SET1. Connecting a resistor from SET1 to GND programs

Channel 1’s output voltage (VOUT = 50µA • RSET1, Ohm’s

Law). Output voltage ranges from 1V to 20V. Connecting

a capacitor from SET1 to Pin 7’s GND improves transient

response, PSRR, noise performance and soft starts the

output.SET1requiresaminimumcapacitorof10nF.Larger

value capacitors reduce output noise while correspond-

ingly increasing startup time. For precision applications,

anexternalreferenceorpowersupplymaydriveSET1(see

ApplicationsInformationsection).Thispowersupplymust

be current-limited to < 1mA or diode-clamped to exceed

VLDOIN1 by no more than 1V.

EN1(Pin10):Channel1’sEnable.PullingEN1lowdisables

Channel 1’s boost converter and linear regulator, thus

turning the output off. Its typical rising threshold is 1.23V

with 125mV of hysteresis. Pulling both EN1 and EN2 low

activates the micropower shutdown state in which internal

circuit blocks shared by both channels are also disabled.

EN1 can be used as a digital shutdown pin or, with the

use of an external resistor divider, an external VIN UVLO

threshold can be programmed. If EN1 is unused, tie EN1

to VIN. Do not float EN1.

EN2 (Pin 11): Channel 2’s Enable. Pulling EN2 low turns

off Channel 2’s boost converter and linear regulator, thus

turning the output off. Its typical rising threshold is 1.23V

with 125mV of hysteresis. Pulling both EN1 and EN2 low

activates the micropower shutdown state in which internal

circuit blocks shared by both channels are also disabled.

EN2 can be used as a shutdown pin or, with the use of an

external resistor divider, an external VIN UVLO threshold

can be programmed. If EN2 is unused, tie EN2 to VIN. Do

not float EN2.

SET2 (Pin 12): Output Voltage Set. This pin is the non-

inverting input to Channel 2’s LDO error amplifier and the

regulationsetpoint.Aprecision,trimmed50µAflowsoutof

SET2. Connecting a resistor from SET2 to GND programs

Channel 2’s output voltage (VOUT2 = 50µA • RSET2, Ohm’s

Law). Output voltage ranges from 1V to 20V. Connecting a

capacitor from SET2 to Pin 14’s GND improves transient

response, PSRR, noise performance and soft starts the

output.SET2requiresaminimumcapacitorof10nF.Larger

value capacitors reduce output noise while correspond-

ingly increasing startup time. For precision applications,

anexternalreferenceorpowersupplymaydriveSET2(see

ApplicationsInformationsection).Thispowersupplymust

be current-limited to < 1mA or diode-clamped to exceed

VLDOIN2 by no more than 1V.

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