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NCV7361

Voltage Regulator with Integrated LIN Transceiver

ON Semiconductor 

NCV7361A

FUNCTIONAL DESCRIPTION

The NCV7361A consists of a low drop voltage regulator

5.0 V/50 mA and a LIN Bus transceiver, which is a

bidirectional bus interface for data transfer between the

LIN bus and the LIN protocol controller.

Additionally, the NCV7361A features a RESET output

with a reset delay of 100 ms and a fixed threshold of 4.65 V

and Enable (EN) control for the regulator.

Operating Modes

The NCV7361A provides two main operating modes

“normal” and “sleep” and the intermediate states “POR”,

“Ini−state” and “thermal shutdown”. The main modes are

fixed states defined by basic actions (VSUP start, EN or

wake−up). The intermediate states are soft states. They

aren’t defined by logical actions but by changes of voltage

(VSUP, VOUT) or junction temperature.

VSUP POWER ON

POR

Clear All State−FF

VSUP > UVR_OFF

Clear RESET Timer

Regulator ON VOUT Ramp Up

RESET = L

Wake−Up Disabled

VSUP < UVR_ON

VSUP < UVR_ON

Ini−state

VSUP > UVR_OFF and

(EN = L/H or Bus Wake−Up)

VOUT > VRES (4.65 V)

VOUT < VRES

EN = H

Normal

Mode

Regulator ON

RESET = L after 100 ms

RESET = H

Wake−Up Disabled

LIN Transceiver ON

EN = L

Sleep

Mode

EN = H/L

Sleep Mode and

TJ < TJREC

Normal Mode and

TJ < TJREC

Normal Mode and

TJ > TJSHD

Sleep Mode and

TJ < TJSHD

Regulator OFF

Wake−Up Enabled (LIN Receiver ON)

LIN Transmitter OFF

Thermal

Shutdown

TJ < TJREC

Regulator OFF

Wake−Up Disabled

LIN Transceiver OFF

Figure 15. State Diagram of Operating Modes

Normal Mode

The whole NCV7361A is active. Switching to normal

mode can be done via the following actions:

• Start of VSUP or after Undervoltage Reset

• Rising Edge at EN (EN = High) (Local Wake−Up)

• Activity on the LIN Bus (Remote Wake−Up)

Sleep Mode

Sleep mode is most current saving. With a falling edge

on EN (EN = Low) the NCV7361A is switched from

normal mode into sleep mode. The voltage regulator will

be switched off and the LIN transceiver is in

recessive state.

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