Features
- Wide common-mode input range: -0.2V to +26V
- Supports high-side and low-side current sensing
- High bandwidth: up to 350kHz (20V/V gain option)
- Low input offset voltage: ±150µV max (VCM = 0V), ±500µV max (VCM = 12V)
- Fast response with 2V/µs slew rate
- High accuracy: ±1% max gain error and 1µV/°C max offset drift
- Fixed gain options: 20V/V, 50V/V, 100V/V, and 200V/V
- Low power consumption: 260µA max quiescent current per channel
- Alternate pinout (IN+ on pin 1, OUT on pin 4) for PCB layout flexibility and design compatibility
Description
The RRA71180 provides high-accuracy current sensing in a compact, cost-effective package. This voltage-output current sense amplifier accurately measures the differential voltage across an external shunt resistor and converts it into a ground-referenced output for easy integration into power monitoring and control systems. Its wide common-mode input range of -0.2V to +26V supports both high-side and low-side current measurements in 12V and 24V applications.
Designed for seamless integration into existing designs, the RRA71180 features an alternate pin configuration with the output located on pin 4 and the non-inverting input located on pin 1, providing additional flexibility for PCB layout and routing. Fixed-gain options of 20V/V, 50V/V, 100V/V, and 200V/V are provided through an integrated precision-matched resistor network, delivering excellent accuracy with minimal gain error and temperature drift. Operating from a 2.7V to 5.5V supply and consuming only 260µA typical quiescent current, the device is ideal for always-on current, power, and energy monitoring applications where every microamp counts.
Parameters
| Attributes | Value |
|---|---|
| VS (Min) (V) | 2.7 |
| VS (Max) (V) | 5.5 |
| PSRR (db) | 40 |
| CMRR (dB) | 100 |
| Common Mode Input Range (V) | 0.2 - 26 |
| Gain Error / Measurement Error (Max) | 1 |
| G (V/V) | 20 - 20, 50 - 50, 100 - 100, 200 - 200 |
| IS per Amp (mA) | 0.3 |
| Offset Voltage (Max) (mV) | 0.5 |
| Qualification Level | Standard |
Package Options
| Pkg. Type | Pkg. Dimensions (mm) | Lead Count (#) | Pitch (mm) |
|---|---|---|---|
| SOT23 | 2.9 x 1.6 x 0.00 | 5 | 1 |
Product Comparison
 | | | | |
| RRA71180 | ISL28005 | ISL28006 | RRA70180 | |
| Common Mode Input Range | 0.2 - 26 | 0 - 28 | 0 - 28 | 0.2 - 26 |
| VS (Min) (V) | 2.7 | 2.7 V | 2.7 V | 2.7 |
| VS (Max) (V) | 5.5 | 28 V | 28 V | 5.5 |
| PSRR (db) | 40 | 105 | 105 | 40 |
| CMRR (dB) | 100 | 115 | 115 | 100 |
| IS per Amp (mA) | 0.3 | 0.05 | 0.05 | 0.3 |
Applications
- Motor Drives and Phase-Current Sensing
- Battery Pack and BMS Charge-Discharge Monitoring
- DC Power-Rail Management, Including DC/DC Converters, Hot-Swap Controllers, E-Fuses, and ORing Circuits
- LED and Lighting Control, Including Constant-Current Regulation and Fault Detection
- Fast Overcurrent and Short-Circuit Detection and Load Diagnostics
- Solar and PV Inverters and Charge Controllers with MPPT Current Sensing
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