HV+

HV-

to Load

Floating

Power Supply

3.3 V, or 5.0 V

3.3 V or 5.0 V

AMC1302-Q1

OUTP

OUTN

VDD2

GND2

GND1

INP

INN

VDD1

ADS121S101-Q1

12-Bit ADC

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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

AMC1302-Q1

SBAS920 – OCTOBER 2018

AMC1302-Q1 Precision, Reinforced Isolated Amplifier With High CMTI,

Input Voltage Range of ±50 mV, and High Bandwidth of 280 kHz

1

1 Features

1

•

AEC-Q100 Qualified for Automotive Applications:

–

•

±50-mV Input Voltage Range for Low Dissipation,

Shunt-Resistor-Based Current Measurement

•

Fixed Gain With Low Drift: 41 ± 0.3%, ±50 ppm/°C

•

Low Input Offset and Drift: ±100 µV, ±0.8 µV/°C

•

Low Nonlinearity and Drift: ±0.03%, ±1 ppm/°C

•

Very Low Isolated High-Side Power Dissipation

When Operated From a 3.3-V Supply

•

System-Level Diagnostic Features

•

Safety-Related Certifications:

–

V 0884-11 (VDE V 0884-11): 2017-01

–

–

CAN/CSA No. 5A-Component Acceptance

Service Notice

•

High CMTI: 140 kV/µs (typ), 70 kV/µs (min)

2 Applications

•

Shunt-Resistor-Based Current Sensing In:

–

Onboard Chargers (OBC)

–

DC/DC Converters

–

Traction Inverters

–

Battery Management Systems (BMS)

3 Description

The AMC1302-Q1 is a precision isolated amplifier

with a capacitive isolation barrier that has high

immunity

to

magnetic

interference.

This

barrier

with a very long lifetime and low power dissipation.

When used with isolated power supplies, this device

isolates

components

that

operate

on

different

common-mode

voltage

levels.

Furthermore,

the

AMC1302-Q1 also protects lower-voltage devices

from damage.

The input of the AMC1302-Q1 is optimized for direct

connection to shunt resistors or other low voltage-

level signal sources. The ±50-mV input voltage range

allows significant reduction of the power dissipation

through the shunt. Additionally, the low high-side

supply current and voltage of the AMC1302-Q1 allow

use of low-cost isolated power-supply solutions. The

performance of the device supports accurate current

control resulting in system-level power savings and in

low torque ripple that is particularly important in motor

control applications. The integrated input common-

mode overvoltage and missing high-side supply

voltage

detection

features

of

the

AMC1302-Q1

simplify system-level diagnostics.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

AMC1302-Q1

SOIC (8)

5.85 mm × 7.50 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Simplified Schematic