Overview
The INA303A1IPWR, produced by Texas Instruments, is a high-precision, bidirectional current-sensing amplifier with two integrated high-speed comparators. This device is part of the INA30x family and is designed for detecting out-of-range current conditions, including both overcurrent and undercurrent scenarios. The INA303 features a zero-drift topology, enabling high-accuracy measurements with minimal input offset voltage and drift. It operates from a single supply voltage ranging from 2.7 V to 5.5 V and can measure currents across a wide common-mode voltage range of –0.1 V to +36 V.
The device includes adjustable limit thresholds set using external resistors, and the alert outputs can be configured in either transparent or latched modes. The response time for the ALERT1 threshold is less than 1 µs, while the ALERT2 threshold response time is adjustable via an external capacitor.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Differential Input Voltage Range (A1 version) | 0 | - | ±125 | mV |
| Common-Mode Rejection Ratio (A1 version) | 100 | 114 | 120 | dB |
| Offset Voltage (A1 version) | ±5 | ±15 | ±30 | µV |
| Offset Voltage Drift | 0.02 | 0.25 | - | µV/°C |
| Gain (A1 version) | 20 | - | - | V/V |
| Gain Error (A1 version) | ±0.02% | ±0.075% | ±0.15% | - |
| Supply Voltage | 2.7 | - | 5.5 | V |
| Supply Current | - | - | 950 | µA |
| Operating Temperature Range | -40 | - | 125 | °C |
| Package | - | - | TSSOP (14-pin) | - |
Key Features
- High-Accuracy Amplifier: Zero-drift topology with low offset voltage (max 30 µV) and drift (max 0.25 µV/°C).
- Adjustable Thresholds: Threshold levels set individually using external resistors for both overcurrent and undercurrent detection.
- High-Speed Comparators: ALERT1 response time under 1 µs, ALERT2 response time adjustable from 2 µs to 10 s via an external capacitor.
- Open-Drain Outputs: ALERT outputs can be configured in transparent or latched modes, requiring external pull-up resistors.
- Wide Common-Mode Range: Measures differential voltage signals on common-mode voltages from –0.1 V to +36 V.
- Single Supply Operation: Operates from a single supply voltage of 2.7 V to 5.5 V.
Applications
- Overcurrent Protection: Detects and responds to overcurrent conditions to prevent component or system damage.
- Motor Control: Monitors current in motor control systems to ensure safe and efficient operation.
- Power-Supply Protection: Protects power supplies from overcurrent and undercurrent conditions.
- Computers and Servers: Used in current monitoring and protection in computing and server systems.
- Telecom Equipment: Ensures reliable current monitoring in telecommunications equipment).
Q & A
- What is the primary function of the INA303A1IPWR?
The INA303A1IPWR is a bidirectional current-sensing amplifier with two high-speed comparators designed to detect out-of-range current conditions, including both overcurrent and undercurrent scenarios).
- What is the range of the supply voltage for the INA303A1IPWR?
The device operates from a single supply voltage ranging from 2.7 V to 5.5 V).
- How are the threshold levels set for the comparators?
The threshold levels are set individually using external resistors or by connecting an external voltage source to each LIMITx pin).
- What is the response time for the ALERT1 and ALERT2 thresholds?
The ALERT1 response time is less than 1 µs, while the ALERT2 response time is adjustable from 2 µs to 10 s via an external capacitor).
- What is the common-mode voltage range that the INA303A1IPWR can measure?
The device can measure differential voltage signals on common-mode voltages from –0.1 V to +36 V).
- What are the typical applications of the INA303A1IPWR?
Typical applications include overcurrent protection, motor control, power-supply protection, computers and servers, and telecom equipment).
- What is the maximum offset voltage of the INA303A1IPWR?
The maximum offset voltage is 30 µV for the A1 version).
- How is the gain of the INA303A1IPWR specified?
The gain for the A1 version is 20 V/V).
- What is the operating temperature range of the INA303A1IPWR?
The device operates over an extended temperature range of –40°C to +125°C).
- What package type is the INA303A1IPWR available in?
The device is available in a 14-pin TSSOP package).
