5 Pin Configuration and Functions

RT

EN

VIN

VIN

PGND

PGND

VOUT

VOUT

DNC

VIN

VIN

PGND

PGND

VOUT

VOUT

DNC

1

2

3

4

5

6

7

8

21

20

19

18

17

16

15

14

27

AGND

28

PGND

29

PGND

30

VOUT

Figure 5-1. 30-Pin QFN, RDH Package (Top View)

Table 5-1. Pin Functions

PIN

TYPE(1)

DESCRIPTION

NAME

NO.

AGND

24, 27

G

Analog ground. Zero voltage reference for internal references and logic. All electrical parameters

are measured with respect to this pin. This pin must be connected to PGND at a single point.

See Section 10.2 for a recommended layout.

DNC

20, 21

-

Do Not Connect. Do not connect these pins to ground, to another DNC pin, or to any other voltage.

These pins are connected to internal circuitry. Each pin must be soldered to an isolated pad.

EN

2

I

Precision enable input pin. High = on, low = off. Can be connected to VIN. Precision enable allows

the pin to be used as an adjustable UVLO. Place an external voltage divider between this pin,

AGND, and VIN to create an external UVLO.

FB

25

I

Feedback input. Connect the mid-point of the feedback resistor divider to this pin. Connect the

PG

26

O

Power-good pin. Open-drain output that asserts low if the feedback voltage is not within the

specified window thresholds. A 10-kΩ to 100-kΩ pullup resistor is required to a suitable pullup

voltage. If not used, this pin can be left open or connected to PGND.

PGND

5, 6, 16, 17,

28, 29

G

Power ground. This is the return current path for the power stage of the device. Connect this pad to

the input supply return, the load return, and the capacitors associated with the VIN and VOUT pins.

See Section 10.2 for a recommended layout.

RT

1

I

Frequency setting pin. Use this analog pin to set the switching frequency between 200 kHz and

2.2 MHz by placing an external resistor from this pin to AGND. Do not leave open or connect to

ground.

SW

11

P

Switch node. Do not place any external component on this pin or connect to any signal. The amount

of copper placed on this pin must be kept to a minimum to prevent issues with noise and EMI.

VCC

23

O

Internal LDO output. Used as supply to internal control circuits. Do not connect to any external

loads. Connect a high-quality 1-μF capacitor from this pin to AGND.

TLVM13630

SLVSFT6 – MAY 2021

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