Overview
The AMC1302-Q1 is a precision, isolated amplifier designed by Texas Instruments for high-reliability applications, particularly in the automotive sector. This device is AEC-Q100 qualified, ensuring it meets stringent automotive standards, and is functional safety-capable. It features reinforced galvanic isolation, which protects the low-voltage side from hazardous voltages and damage. The AMC1302-Q1 is optimized for direct connection to low-impedance shunt resistors or other low-impedance voltage sources, making it ideal for accurate current measurements in various automotive systems.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Power-supply voltage (High-side VDD1 to GND1) | -0.3 | 6.5 | V | |
| Power-supply voltage (Low-side VDD2 to GND2) | -0.3 | 6.5 | V | |
| Analog input voltage (INP, INN to GND1) | -6 | VDD1 + 0.5 | V | |
| Output voltage (OUTP, OUTN to GND2) | -0.5 | VDD2 + 0.5 | V | |
| Input current (Continuous, any pin except power-supply pins) | -10 | 10 | mA | |
| Junction temperature (TJ) | 150 | °C | ||
| Operating ambient temperature (TA) | -40 | 125 | °C | |
| Differential input voltage before clipping output (VIN = VINP - VINN) | -64 | 64 | mV | |
| Specified linear differential full-scale voltage (VIN = VINP - VINN) | -50 | 50 | mV | |
| Input offset voltage (VOS) | -50 | ±2.5 | 50 | μV |
| Input offset drift (TCVOS) | -0.8 | ±0.15 | 0.8 | μV/°C |
| Gain error | ±0.2% | |||
| Gain drift | ±35 ppm/°C | |||
| Nonlinearity | 0.03% | |||
| Common-mode transient immunity (CMTI) | 100 | 150 | kV/μs | |
| Output bandwidth | 220 | 280 | kHz | |
| Output resistance (ROUT) | < 0.2 | Ω | ||
| Output short-circuit current | ±14 | mA |
Key Features
- AEC-Q100 qualified for automotive applications with a temperature grade 1: –40°C to 125°C.
- Functional Safety-Capable with documentation available to aid in functional safety system design.
- ±50-mV input voltage range optimized for current measurements using shunt resistors.
- Fixed gain of 41.
- Low DC errors: offset error ±50 μV (max), offset drift ±0.8 μV/°C (max), gain error ±0.2% (max), and gain drift ±35 ppm/°C (max).
- 3.3-V or 5-V operation on both high-side and low-side.
- Fail-safe output.
- High common-mode transient immunity (CMTI): 100 kV/μs (min).
- Low EMI, meeting CISPR-11 and CISPR-25 standards.
- Safety-related certifications: 7000-VPK reinforced isolation per DIN EN IEC 60747-17 (VDE 0884-17) and 5000-VRMS isolation for 1 minute per UL1577.
- Integrated missing-shunt and missing high-side supply detection features.
Applications
- Shunt-resistor-based current sensing in HEV/EV onboard chargers (OBC), DC/DC converters, inverters, and motor control systems.
- HEV/EV eTurbo/chargers.
- PFC stages, DC/DC converters, traction inverters, and OBCs in automotive systems.
Q & A
- What is the operating temperature range of the AMC1302-Q1?
The AMC1302-Q1 operates over an ambient temperature range of –40°C to 125°C.
- What are the power supply voltage ranges for the AMC1302-Q1?
The high-side power supply (VDD1) and low-side power supply (VDD2) can operate within the range of 3.0 V to 5.5 V.
- What is the input voltage range for the AMC1302-Q1?
The input voltage range is ±50 mV, optimized for current measurements using shunt resistors.
- What is the gain of the AMC1302-Q1?
The AMC1302-Q1 has a fixed gain of 41.
- What are the key DC error specifications of the AMC1302-Q1?
The key DC error specifications include an offset error of ±50 μV (max), offset drift of ±0.8 μV/°C (max), gain error of ±0.2% (max), and gain drift of ±35 ppm/°C (max).
- Does the AMC1302-Q1 meet any specific safety and EMI standards?
Yes, it meets CISPR-11 and CISPR-25 EMI standards and has safety-related certifications such as 7000-VPK reinforced isolation and 5000-VRMS isolation.
- What is the common-mode transient immunity (CMTI) of the AMC1302-Q1?
The CMTI is 100 kV/μs (min).
- What are the typical applications of the AMC1302-Q1?
It is used in shunt-resistor-based current sensing in HEV/EV onboard chargers, DC/DC converters, inverters, and motor control systems, as well as in HEV/EV eTurbo/chargers.
- Does the AMC1302-Q1 have any integrated detection features?
Yes, it has integrated missing-shunt and missing high-side supply detection features.
- What is the isolation rating of the AMC1302-Q1?
The AMC1302-Q1 provides reinforced galvanic isolation of up to 5 kVRMS according to DIN EN IEC 60747-17 (VDE 0884-17).
