Low-Power LIN SBC: IM1028x

Simplifies the design of smart automotive actuator-node systems.

The Immorta IM1028x is a domestically developed automotive-grade integrated voltage regulator (LDO) and LIN transceiver, designed to meet the demanding requirements of automotive electronic systems. The product complies with the "LIN 2.x / ISO 17987-4:2016 / SAE J2602" standards, ensuring a high degree of interoperability and compatibility with other LIN bus devices.

The IM1028x delivers excellent EMC performance. The ESD protection on the LIN pin supports HBM ±8 kV, eliminating the need for additional external ESD devices in the vast majority of applications. Furthermore, the product passed the Class A requirement of Level IV (200 mA) in BCI testing, enabling stable operation in harsh automotive EMC environments.

Main Features

Compliant with AEC-Q100 automotive-grade certification
Operating junction temperature: −40 °C to +150 °C
Compliant with LIN 2.0, LIN 2.1, LIN 2.2, LIN 2.2A and ISO 17987-4 electrical physical layer (EPL) specifications
Supports TXD dominant-timeout protection
Provides 3.3 V or 5 V output, up to 100 mA current, with ±2% accuracy
Standby current 20 µA, sleep current 13 µA
Low electromagnetic emission (EME) and high electromagnetic immunity (EMI)
Supports normal mode, low-power standby mode and low-power sleep mode
Supports ±8 kV ESD on LIN/BAT pins
Supports on-chip over-temperature protection

Highlights

Standby-mode current as low as 20 µA, effectively reducing system power consumption
±8 kV pin ESD, meeting ISO 7637 waveform testing
EMC-specific protection circuitry allows the chip to meet the highest BCI level (Level IV) without extra EMC components

Applications

Steering-wheel control switchSeat adjustmentSeat lumbar supportPM2.5, fragrance & oxygen sensorsAmbient lightingReading lightsDoor/window controllerLight & rain sensor

Block Diagram

Typical Application

Product Models

Model	Input Voltage	Output Current	Output Voltage	Ambient Temp.	Package	Trays / Tape & Reel
IM1028T/5V0/20	6 V ~ 40 V	100 mA	5 V	−40 °C ~ 125 °C	SOP8	Tape & Reel
IM1028T/3V3/20	6 V ~ 40 V	100 mA	3.3 V	−40 °C ~ 125 °C	SOP8	Tape & Reel
IM1028TK/5V0/20	6 V ~ 40 V	100 mA	5 V	−40 °C ~ 125 °C	DFN8	Tape & Reel
IM1028TK/3V3/20	6 V ~ 40 V	100 mA	3.3 V	−40 °C ~ 125 °C	DFN8	Tape & Reel

Pin Information

Pin No.	Pin Name	Pin Type	Function Description
1	BAT	Power input	Battery power supply
2	EN	Enable input	Mode-switch input; internal pull-down resistor; high level = normal mode, low level = low-power mode
3	GND	Ground	Ground
4	LIN	LIN bus interface	LIN bus high-voltage input/output port
5	RXD	Receiver output	Digital logic output of the receiver; pulled low upon a wake-up event
6	TXD	Transmitter input	Digital logic input of the transmitter; internal pull-up resistor
7	RSTN	Reset signal output	Controls reset of the external system; internal pull-up resistor; outputs low after VCC under-voltage protection
8	VCC	LDO voltage output	Low-dropout regulator (LDO) output

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