INA293A1

Part: INA293A3IDBVT — Texas Instruments

Type: Current Sense Amplifier (high-side/low-side, zero-drift)

Description: -4 V to 110 V common-mode, 1.3 MHz bandwidth, ultra-precise current sense amplifier with 2.7–20 V supply, ±0.15% max gain error, and 1.5 mA typical quiescent current. The A3 variant has a fixed gain of 100 V/V.

Operating Conditions:

• Supply voltage: 2.7–20 V
• Operating temperature: -40 to +125 °C
• Common-mode input range: -4 V to +110 V
• Differential sense input range: 0 to Vs/G

Absolute Maximum Ratings:

• Max supply voltage: 22 V
• Common-mode input voltage: -20 V to 120 V
• Differential input voltage (INA293A3): ±12 V
• Max junction temperature: 150 °C
• Storage temperature: -65 to 150 °C

Key Specs:

• Gain (INA293x3): 100 V/V; gain error ±0.02% typ, ±0.15% max; gain drift ±1 ppm/°C typ, ±10 ppm/°C max (Vs = 5 V, TA = -40 to +125 °C)
• Offset voltage (x3): ±10 μV typ, ±50 μV max; drift ±0.05 μV/°C typ, ±0.5 μV/°C max
• CMRR: 140 dB min, 160 dB typ (DC, -4 V ≤ VCM ≤ 110 V); 85 dB typ at 50 kHz
• Bandwidth (x3): 1000 kHz typ (CLOAD = 5 pF, VSENSE = 40 mV)
• Slew rate: 2.5 V/μs typ
• Input bias current: 20 μA typ (10–30 μA) per input
• Quiescent current: 1.5 mA typ, 2 mA max at 25 °C, 2.25 mA max over -40 to +125 °C
• Output swing: Vs - 0.07 V typ to Vs rail (Vs - 0.15 V max); 5 mV typ to ground (20 mV max), RLOAD = 10 kΩ
• Voltage noise density: 50 nV/√Hz

Features:

• Wide common-mode range of -4 V to +110 V (survival -20 V to +120 V)
• 160 dB DC CMRR and 85 dB AC CMRR at 50 kHz
• Five gain options: 20, 50, 100, 200, 500 V/V
• Suited to fast overcurrent protection
• Two pin-out variants (INA293A and INA293B)
• Capacitive load tolerance up to 500 pF without isolation resistor

Applications:

• Active antenna system mMIMO (AAS)
• Macro remote radio unit (RRU)
• 48-V rack server
• 48-V merchant network and server PSU
• 48-V battery management systems (BMS)

Package:

• SOT-23 (DBV), 5 pins, 2.90 mm × 1.60 mm nominal

• Wide common-mode voltage:
• -Operational voltage: -4 V to +110 V
• -Survival voltage: -20 V to +120 V
• Excellent CMRR:
• -160-dB DC-CMRR
• -85-dB AC-CMRR at 50 kHz
• Accuracy:
• -Gain:
• Gain error: ±0.15% (maximum)
• Gain drift: ±10 ppm/ °C (maximum)
• -Offset:
• Offset voltage: ±15 μV (typical)

·

Offset drift: ±0.05 μV/ °C (typical)

• Available gains:
• -INA293A1, INA293B1 : 20 V/V
• -INA293A2, INA293B2 : 50 V/V
• -INA293A3, INA293B3 : 100 V/V
• -INA293A4, INA293B4 : 200 V/V
• -INA293A5, INA293B5 : 500 V/V
• High bandwidth: 1.3 MHz
• Slew rate: 2.5 V/μs
• ·
• Quiescent current: 1.5 mA

• Active antenna system mMIMO (AAS)
• Macro remote radio unit (RRU)
• 48-V rack server
• 48-V merchant network & server power supply (PSU)
• 48-V battery management systems (BMS)

Figure 5-1. INA293A: DBV Package 5-Pin SOT-23 Top View

Figure 5-2. INA293B: DBV Package 5-Pin SOT-23 Top View

at T A = 25 °C, V S = 5 V, V SENSE = VIN+ - V IN= 0.5 V / Gain, V CM = VIN- = 48 V (unless otherwise noted)

over operating free-air temperature range (unless otherwise noted) (1)

over operating free-air temperature range (unless otherwise noted)

The INA293 amplifies the voltage developed across a current-sensing resistor as current flows through the resistor to the load. The wide input common-mode voltage range and high common-mode rejection of the INA293 make it usable over a wide range of voltage rails while still maintaining an accurate current measurement.