LTC2846 datasheet(7/24 Pages) LINER

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LTC2846

sn2846 2846fs

PI FU CTIO S

NC (Pin 1): No Connect.

PGND (Pin 2): Boost Switching Regulator Power Ground.

Tie PGND to SGND.

VIN (Pin 3): Input Supply Pin. Input supply to boost

switching regulator. 3V

≤VIN ≤ 3.6V. Bypass with a 10µF

capacitor to ground.

SHDN (Pin 4): Boost Switching Regulator Shutdown Pin.

Tie to 2.4V or more to enable regulator. Ground to shut

down.

C1– (Pin 5): Capacitor C1 Negative Terminal. Connect a

µF capacitor between C1+ and C1–.

C1+ (Pin 6): Capacitor C1 Positive Terminal. Connect a

µF capacitor between C1+ and C1–.

VDD (Pin 7): Generated Positive Supply Voltage for

V.28. Connect a 1

µF capacitor to ground.

VCC (Pin 8): Input Supply Pin. Input supply to trans-

ceiver. 4.75V

≤ VCC ≤5.25V. Connect to output of switch-

ing regulator.

D1 (Pin 9): TTL Level Driver 1 Input.

D2 (Pin 10): TTL Level Driver 2 Input.

D3 (Pin 11): TTL Level Driver 3 Input.

R1 (Pin 12): CMOS Level Receiver 1 Output with Pull-Up

to VIN when Three-Stated.

R2 (Pin 13): CMOS Level Receiver 2 Output with Pull-Up

to VIN when Three-Stated.

R3 (Pin 14): CMOS Level Receiver 3 Output with Pull-Up

to VIN when Three-Stated.

M0 (Pin 15): TTL Level Mode Select Input 0 with Pull-Up

to VIN. See Table 1.

M1 (Pin 16): TTL Level Mode Select Input 1 with Pull-Up

to VIN. See Table 1.

VIN (Pin 17): Input Supply Pin. Input supply to transceiver.

≤VIN ≤ 3.6V. Connect to Pin 3.

M2 (Pin 18): TTL Level Mode Select Input 2 with Pull-Up

to VIN. See Table 1.

DCE/DTE (Pin 19): TTL Level Mode Select Input with

Pull-Up to VIN. See Table 1.

R3 B (Pin 20): Receiver 3 Noninverting Input.

R3 A (Pin 21): Receiver 3 Inverting Input.

R2 B (Pin 22): Receiver 2 Noninverting Input.

R2 A (Pin 23): Receiver 2 Inverting Input.

D3/R1 B (Pin 24): Receiver 1 Noninverting Input and

Driver 3 Noninverting Output.

D3/R1 A (Pin 25): Receiver 1 Inverting Input and Driver 3

Inverting Output.

D2 B (Pin 26): Driver 2 Noninverting Output.

D2 A (Pin 27): Driver 2 Inverting Output.

D1 B (Pin 28): Driver 1 Noninverting Output.

D1 A (Pin 29): Driver 1 Inverting Output.

GND (Pin 30): Transceiver Ground.

VEE (Pin 31): Generated Negative Supply Voltage. Connect

a 3.3

µF capacitor to GND.

C2 – (Pin 32): Capacitor C2 Negative Terminal. Connect a

µF capacitor between C2+ and C2–.

C2 + (Pin 33): Capacitor C2 Positive Terminal. Connect a

µF capacitor between C2+ and C2–.

SGND (Pin 34): Boost Switching Regulator Signal Ground.

Tie PGND to SGND.

FB (Pin 35): Boost Switching Regulator Feedback Pin.

Reference voltage is 1.255V. Connect resistive divider tap

here. Minimize trace area at FB.

SW (Pin 36): Boost Switching Regulator Switch Pin.

Connect inductor/diode here. Minimize trace area at this

pin to reduce EMI.

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