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DS20006704A-page 7

LX7220

2.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 2-1.

TABLE 2-1:

PINOUT DESCRIPTION

Pin Number Pin Name

Description

1

PGOOD

Open Drain status output, requires external pull up resistor. This pin will go low when VOUT

is outside the defined power good range, when the die is hotter than the thermal shutdown

threshold, when PVIN is above the overvoltage threshold, or when PVIN is below the

undervoltage threshold. PGOOD will go high after the last of these fault conditions clear.

2

SDA

Serial data bus (bidirectional) for I2C. Connect directly to GND if unused.

3, PAD

GND

Ground. Connect to ground plane.

4, 9

SW

Switching Node. Drives the external L-C low pass filter.

5, 6, 7, 8

VIN

Input of IC and buck stage. Connect to input rail VIN (between 2.7V and 5.5V). A minimum

input capacitance of one 1 μF and one 22 μF of X5R or better multilayer ceramic, should be

placed very close to IC between this node and GND.

10

EN

Enable for switching regulator. Force high to enable, force low to disable the IC.

11

AGND

Analog Ground. Connect to ground plane.

12

VOUT

Output voltage sense. Connect directly to output rail or resistive voltage divider output.

13

SCL

Serial clock input for I2C. Connect directly to GND if unused.

14

AVIN

Analog input voltage pin.