LT3077ACRZ-R7 datasheet(11/38 Pages) AD

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Data Sheet

LT3077

analog.com

Rev. 0

11 of 38

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

Figure 3. Pin Configuration

Table 5. Pin Descriptions

NAME

DESCRIPTION

Device Enable. EN pin enables/disables the output. The LT3077 typically turns on when

the EN voltage exceeds 1.26V on the rising edge, with an 80mV hysteresis on its falling

edge. Pulling this pin low pulls down the reference, disables the output transistor, and

disables auxiliary functions. Alternatively, the EN pin can set a BIAS-supply UVLO

threshold by using a resistor-divider between BIAS, EN, and GND. If unused, connect

EN to BIAS. Do not float the EN pin.

2, 3, 4

VO0, VO1, VO2

Output Voltage Select. These tri-level pins combine to select a nominal output voltage

from 0.5V to 4.2V. The input logic low threshold is less than 300mV referenced to GND,

and the logic high threshold is greater than 1.97V referenced to GND. The range

between 0.95V and 1.15V defines the logic Hi-Z state. See Table 6 in the Applications

Information section that defines the VOUT versus VO0, VO1, and VO2 settings.

Power Good. The PG pin is an open-drain NMOS output that actively pulls low if EN is

low or if any one of these fault modes is detected:



VOUT is less than 93% of VOUT(NOMINAL) on the rising edge of VOUT.



VOUT is less than 90% of VOUT(NOMINAL) on the falling edge of VOUT.



VBIAS is less than its undervoltage lockout threshold.



The OUT-over-IN voltage detector activates.

6, 7

OUT

Output. The exposed pad consisting of pins 6-7 of the LFCSP-RT package is the

electrical connection to OUT. These pins supply power to the load. Connect the entire

OUT exposed pad consisting of pins 6-7 for proper electrical and thermal performance.

A minimum output capacitance of 10µF is required for stability. ADI recommends low

ESR, X5R or X7R dielectric ceramic capacitors for best performance. Large load

transient applications require larger output capacitors to limit peak voltage transients.

VO0

VO1

VO2

10 GND

11 REF

12 ILIM

13 BIASF

14 BIAS

LT3077

TOP VIEW

(Not to Scale)

LFCSP-RT PACKAGE

18-LEAD (3mm × 3mm × 0.58mm)

TJMAX = 125°C, θJA = 44°C/W

A N A L O G D E V I C E S

C O N F I D E N T I A L

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