LNB SUPPLY AND

CONTROL-VOLTAGE REGULATORS

11

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A8281SLB

A8282SLB

Terminal

Terminal

Terminal

Name

Number

Number

Terminal Description

NC

–

1

No (internal) connection

OLF

2

2

VBULK

3

3

Tracking supply voltage to linear regulator

NC

–

4, 5

No (internal) connection

GND

4

6, 7

Ground and substrate

SENSE

5

8

Current limit setup resistor

LNB

6

9

Output voltage to LNB

LX

7

10

Inductor drive point

VIN

8

11

TCAP

9

12

Capacitor for setting the rise and fall time of the outputs for

line-length compensation

LLC

–

13

Logic input: output voltage select

VSEL1

10

14

Logic input: output voltage select

VSEL0

–

15

Logic input: output voltage select

EN

11

16

Logic input: when high, enables device

ENT

12

17

Logic input: when high, enables internal 22

GND

13

18, 19

Ground and substrate

CPUMP

14

20

High side of charge-pump capacitor

VPUMP

15

21

Gate-supply voltage for high-side drivers

PUMPX

16

22

Charge-pump drive

VINT

–

23

Bypass capacitor for internal voltage reference

EXTM

1

24

External modulation input

Terminal List