Analog Integrated Circuit Device Data

Freescale Semiconductor

3

34713

PIN CONNECTIONS

PIN CONNECTIONS

Figure 3. 34713 Pin Connections

Table 1. 34713 Pin Definitions

A functional description of each pin can be found in the Functional Pin Description section beginning on page 9.

Pin Number

Pin Name

Pin Function

Formal Name

Definition

1

GND

Ground

Signal Ground

Analog signal ground of IC

2

FREQ

Passive

Frequency Adjustment

Buck converter switching frequency adjustment pin

3

ILIM

Input

Soft Start

Soft Start adjustment

4

PG

Output

Power Good

Active-low (open drain) power-good status reporting pin

5, 8

NC

None

No Connect

No internal connections to these pins. Recommend attaching a 0.1µF

capacitor from pin 8 to GND.

6

SD

Input

Shutdown

Shutdown mode input control pin

7

VREFIN

Input

Voltage-Tracking-

Reference Input

Voltage-Tracking-Reference voltage input

9

COMP

Passive

Compensation

Buck converter external compensation network pin

10

INV

Input

Error Amplifier

Inverting Input

Buck converter error amplifier inverting input pin

11

VOUT

Output

Output Voltage

Discharge FET

Discharge FET drain connection (connect to buck converter output

capacitors)

12,13,14

PGND

Ground

Power Ground

Ground return for buck converter and discharge FET

15,16,17

SW

Power

Switching Node

Buck converter power switching node

18,19,20

PVIN

Supply

Power-Circuit Supply

Input

Buck converter main supply voltage input

21

BOOT

Passive

Bootstrap

Bootstrap switching node (connect to bootstrap capacitor)

22,23

VIN

Supply

Logic-Circuit Supply

Input

Logic circuits supply voltage input

24

VDDI

Passive

Internal Voltage

Regulator

Internal Vdd Regulator (connect filter capacitor to this pin)

GND

FREQ

ILIM

PG

NC

SD

SW

PGND

PGND

SW

SW

PVIN

Transparent

Top View

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24