ADP7112 datasheet(11/47 Pages) AD

11 / 47 page

Data Sheet

LT3046

analog.com

Rev 0

11 of 47

exists between the PGFB and GND pins of the LT3046; therefore, do not drive PGFB

more than 0.3V below GND during normal operation or during a fault condition.

SET

The inverting input of the error amplifier and the regulation set-point for the LT3046.

SET sources a precision 100μA current that flows through an external resistor

connected between SET and GND. The output voltage of the LT3046 is determined by

VSET = ISET x RSET. The output voltage range is from 0.2V to 19V. Adding a capacitor from

SET to GND improves noise, PSRR and transient response at the expense of increased

start-up time. For optimum load regulation, Kelvin connect the ground side of the SET

pin resistor directly to the load. A parasitic substrate diode exists between the SET and

GND pins of the LT3046; therefore, do not drive SET more than 0.3V below GND during

normal operation or during a fault condition.

GND

Ground.

OUTS

Output Sense. The OUTS pin is the noninverting input to the error amplifier. For

optimal transient performance and load regulation, Kelvin connect OUTS directly to

the output capacitor and the load. In addition, connect the GND connections of the

output capacitor and the SET pin capacitor directly together. A parasitic substrate

diode exists between the OUTS and GND pins of the LT3046; therefore, do not drive

OUTS more than 0.3V below GND during normal operation or during a fault condition.

11, 12

OUT

Output. The OUT pins supply power to the load. For stability, use a minimum 4.7μF

output capacitor with an ESR below 20mΩ and an ESL below 2nH. Large load

transients require larger output capacitance to limit peak voltage transients. See the

Stability and Output Capacitance section for more information on output capacitance.

A parasitic substrate diode exists between the OUT and GND pins of the LT3046;

therefore, do not drive OUT more than 0.3V below GND during normal operation or

during a fault condition.

EPAD (GND)

Exposed Pad. The exposed pad is an electrical connection to GND. To ensure proper

electrical and thermal performance, solder the exposed backside to the PCB ground

and connect it directly to the GND pin.

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