8283

LNB SUPPLY AND

CONTROL-VOLTAGE REGULATOR

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

6

Symbol

Terminal

Function

OSEL

1

Logic input: selects between LNB on (when high) and

bypass switch closed (when low)

OLF

2

VBULK

3

Tracking supply voltage to linear regulators

MIOUT

4

Output voltage from MI (connect to terminal 9)

MI

5

Master input

GND

6, 7

Ground

SENSE

8Current limit setup resistor

LNB

9

Output voltage to LNB (connect to terminal 4)

LX

10

Inductor drive point

VIN

11

Supply input voltage (minimum, VLNB + 2.5 V)

TCAP

12

Capacitor for setting the rise and fall time of the outputs

LLC

13

Logic input: when high, increases output voltage by 1 V

for line length compensation

VSEL1

14

Logic input: output voltage select

VSEL0

15

Logic input: output voltage select

EN

16

Logic input: when high, enables device

ENT

17

Logic input: when high, enables internal 22 kHz

modulation

GND

18, 19

Ground

CPUMP

20

High side of charge-pump capacitor

VPUMP

21

Gate supply voltage for high-side drivers

PUMPX

22

Charge-pump drive

VINT

23

Bypass capacitor for internal voltage reference

EXTM

24

External modulation input

TerminalConfiguration