CS3361YDR14G Current Sense Amplifier Product Functional Description
1. Overview
The CS3361YDR14G is a high – precision, bidirectional current sense amplifier from Cirrus Logic, designed for accurate current measurement in low – voltage applications. It features a wide input common – mode voltage range and low offset, making it ideal for battery management, motor control, and power monitoring systems.
Key Features
• Bidirectional Current Sensing: Supports both positive and negative current flow.
• Wide Input Common – Mode Range: -0.3V to 26V, independent of supply voltage.
• High Accuracy
◦ Low Offset Voltage: ±150 µV (max)
◦ Gain Error: ±0.5% (max)
• Adjustable Gain: 20 V/V, 50 V/V, or 100 V/V (set via external resistors).
• Low Quiescent Current: 350 µA (typical), suitable for power – sensitive designs.
• Small Package: SOIC – 8 (5mm × 4mm), space – efficient for PCB layouts.
2. Functional Description
2.1 Current Sensing & Amplification
• Measures voltage drop across a shunt resistor (e.g., 1 mΩ to 100 mΩ).
• Differential Input: Rejects common – mode noise for precise measurements.
• Bidirectional Operation: Detects current flow in both directions (e.g., charging/discharging in battery systems).
2.2 Output & Signal Conditioning
• Rail – to – Rail Output: Ensures full dynamic range even at low supply voltages.
• Bandwidth: 120 kHz (typical), suitable for dynamic current monitoring.
• Reference Pin (VREF): Allows output offset adjustment for single – supply systems.
2.3 Power Supply & Protection
• Supply Voltage Range: 2.7V to 5.5V (single supply).
• Built – in Protection
◦ Overvoltage tolerance on input pins (±30V).
◦ Thermal shutdown.
3. Applications
• Battery Management Systems (BMS): Charge/discharge current monitoring.
• Motor Control: Overcurrent detection in brushed/brushless DC motors.
• Power Supplies & Converters: Load current feedback.
• Industrial & Automotive Systems: Current sensing in 12V/24V buses.
