INA30x-Q1 AEC-Q100, 36-V, Bidirectional, 550-kHz, 4V/µs, High-Precision Current Sense Amplifier With Dual Window Comparator
1 Features
- AEC-Q100 qualified for automotive applications
- Temperature grade 1: –40°C ≤ TA ≤ +125°C
- HBM ESD classification level 2
- CDM ESD classification level C6
- Functional Safety-Capable
- Wide common-mode input range: –0.1 V to +36 V
- Dual comparator outputs:
- INA302-Q1: Two independent overlimit alerts
- INA303-Q1: Window comparator
- Threshold levels set individually
- Comparator 1 alert response: 1 µs
- Comparator 2 adjustable delay: 2 µs to 10 s
- Open-drain outputs with independent latch control modes
- High accuracy amplifier:
- Offset voltage: 30 µV (max, A3 version)
- Offset voltage drift: 0.5 µV/°C (max)
- Gain error: 0.15% (max, A3 version)
- Gain error drift: 10 ppm/°C
- Available amplifier gains:
- INA302A1-Q1, INA303A1-Q1: 20 V/V
- INA302A2-Q1, INA303A2-Q1: 50 V/V
- INA302A3-Q1, INA303A3-Q1: 100 V/V
2 Applications
- System fault detection
- Motor control and protection
- Pump control and protection
- DC/DC converters
- Body control module
3 Description
The INA302-Q1 and INA303-Q1 (INA30x-Q1) devices feature a high common-mode, bidirectional, current-sensing amplifier and two high-speed comparators to detect out-of-range current conditions. The INA302-Q1 comparators are configured to detect and respond to overcurrent conditions. The INA303-Q1 comparators are configured to respond to both overcurrent and undercurrent conditions in a windowed configuration. These devices feature an adjustable limit threshold range for each comparator set using an external limit-setting resistor. These current-shunt monitors can measure differential voltage signals on common-mode voltages that can vary from –0.1 V up to +36 V, independent of the supply. In addition, these devices will survive with common-mode voltages as high as 40 V.
The open-drain alert outputs can be configured to operate in either a transparent mode (output status follows the input state), or in a latched mode (alert output is cleared when the latch is reset). The alert response time for comparator 1 is under 1 µs, and the alert response for comparator 2 is set through an external capacitor ranging from 2 µs to 10 s.
These devices operate from a single 2.7-V to 5.5-V supply, drawing a maximum supply current of 950 μA. The devices are specified over the extended operating temperature range of –40°C to +125°C, and are available in a 14-pin TSSOP package.
| PART NUMBER | PACKAGE | BODY SIZE (NOM) |
|---|---|---|
| INA302-Q1 | TSSOP (14) | 4.40 mm × 5.00 mm |
| INA303-Q1 |
Typical Application5 Pin Configuration and Functions
Figure 5-1 PW Package14-Pin TSSOPTop View| PIN | TYPE | DESCRIPTION | |
|---|---|---|---|
| NO. | NAME | ||
| 1 | VS | Analog | Power supply, 2.7 V to 5.5 V |
| 2 | OUT | Analog output | Output voltage |
| 3 | LIMIT1 | Analog input | ALERT1 threshold limit input; see the Section 7.3.3.1 section for details on setting the limit threshold |
| 4 | REF | Analog input | Reference voltage, 0 V to VS |
| 5 | GND | Analog | Ground |
| 6 | LATCH1 | Digital input | Transparent or latch mode selection input |
| 7 | LATCH2 | Digital input | Transparent or latch mode selection input |
| 8 | NC | — | No internal connection |
| 9 | LIMIT2 | Analog input | ALERT2 threshold limit input; see the Section 7.3.3.1 section for details on setting the limit threshold |
| 10 | DELAY | Analog input | Delay timing input; see the Section 7.3.3 section for details on setting the delayed alert response for comparator 2 |
| 11 | ALERT2 | Analog output | Open-drain output; active-low. This pin is an overlimit alert for the INA302-Q1 and an underlimit alert for the INA303-Q1. |
| 12 | ALERT1 | Analog output | Open-drain output, active-low overlimit alert |
| 13 | IN– | Analog input | Connect to load side of the current-sensing resistor |
| 14 | IN+ | Analog input | Connect to supply side of the current-sensing resistor |
