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Current Sense Amplifiers

 

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Silicon Labs' unidirectional and bi-directional, voltage-output current-sense amplifiers are the lowest-power and most accurate current-sense amplifiers available today. Consuming a very low 1 µA supply current, these high-side current-sense amplifiers exhibit a 100-µV (max) VOS and a 0.6% (max) gain error, both specifications are optimized for precision current measurement. For all high-side bidirectional current-sensing applications, the current sense amplifier devices are self-powered and feature a wide input common-mode voltage range from 2 V to 25 V.

A SIGN comparator digital output is also provided that indicates the direction of current flow depending on the external connections to the current sense amplifiers RS+ and RS- input terminals.

The SOT23 package makes the devices an ideal choice for pcb-area-critical, supply-current-conscious, high-accuracy current-sense applications in all battery-powered and portable instruments.

All current sense amplifiers are specified for operation over the -40 °C to +105 °C extended temperature range.

 

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Features

  • Ultra-Low Supply Current: 1 µA
  • Wide Input Common Mode Range: +2 V to +25 V
  • Low Input Offset Voltage: 100 µV (max)
  • Low Gain Error: 0.6% (max)
  • Bi-directional parts have SIGN Comparator Output with No "Dead Zone" at ILOAD Switchover 
  •  5- or 6- Lead SOT23 Packaging
  • Four Gain Options Available:
    • TS110x-25: Gain = 25 V/V
    • TS110x-50: Gain = 50 V/V
    • TS110x-100: Gain = 100 V/V
    • TS110x-200: Gain = 200 V/V

Current Sense Amplifiers Product Matrix

Devices
Part Number Description Bidirectional Buffered? Coulomb Counter Current Limit
TS1100-100
Unidirectional Current-Sense Amplifier, G=100V/V, 100µV VOS No — No No
TS1100-200
Unidirectional Current-Sense Amplifier, G=200V/V, 100µV VOS No — No No
TS1100-25
Unidirectional Current-Sense Amplifier, G=50V/V, 100µV VOS No — No No
TS1100-50
Unidirectional Current-Sense Amplifier, G=25V/V, 100µV VOS No — No No
TS1101-100
Bidirectional Current-Sense Amplifier, G=100V/V, 100µV VOS Yes — No No
TS1101-200
Bidirectional Current-Sense Amplifier, G=200V/V, 100µV VOS Yes — No No
TS1101-25
Bidirectional Current-Sense Amplifier, G=50V/V, 100µV VOS Yes — No No
TS1101-50
Bidirectional Current-Sense Amplifier, G=25V/V, 100µV VOS Yes — No No
TS1102-100
Unidirectional Current-Sense Amplifier, G=100V/V, 200µV VOS No — No No
TS1102-200
Unidirectional Current-Sense Amplifier, G=200V/V, 200µV VOS No — No No
TS1102-25
Unidirectional Current-Sense Amplifier, G=50V/V, 200µV VOS No — No No
TS1102-50
Unidirectional Current-Sense Amplifier, G=25V/V, 200µV VOS No — No No
TS1103-100
Bidirectional Current-Sense Amplifier, G=100V/V, 200µV VOS Yes — No No
TS1103-200
Bidirectional Current-Sense Amplifier, G=200V/V, 200µV VOS Yes — No No
TS1103-25
Bidirectional Current-Sense Amplifier, G=50V/V, 200µV VOS Yes — No No
TS1103-50
Bidirectional Current-Sense Amplifier, G=25V/V, 200µV VOS Yes — No No
TS1105-20
Unidirectional Current-Sense Amplifier, Buffered Unipolar Output G=20V/V No Unipolar No No
TS1105-200
Unidirectional Current-Sense Amplifier, Buffered Unipolar Output G=200V/V No Unipolar No No
TS1106-20
Bidirectional Current-Sense Amplifier, Buffered Unipolar Output G=20V/V Yes Unipolar No No
TS1106-200
Bidirectional Current-Sense Amplifier, Buffered Unipolar Output G=200V/V Yes Unipolar No No
TS1107-20
Current Sense Amplifier with Current Limiter G=20V/V Yes Bipolar No Yes
TS1107-200
Current Sense Amplifier with Current Limiter G=200V/V Yes Bipolar No Yes
TS1108-20
Coulomb Counter G=20V/V Yes Bipolar Yes No
TS1108-200
Coulomb Counter G=200V/V Yes Bipolar Yes No
TS1109-20
Bidirectional Current-Sense Amplifier, Buffered Bipolar Output G=20V/V Yes Bipolar No No
TS1109-200
Bidirectional Current-Sense Amplifier, Buffered Bipolar Output G=200V/V Yes Bipolar No No
TS1110-20
Current Sense Amplifier with Current Limiter & FET control G=20V/V Yes Bipolar No Yes
TS1110-200
Current Sense Amplifier with Current Limiter FET & control G=200V/V Yes Bipolar No Yes
TSM9634F
Unidirectional Current-Sense Amplifier, G=50V/V, 250µV VOS No — No No
TSM9634H
Unidirectional Current-Sense Amplifier, G=100V/V, 250µV VOS No — No No
TSM9634T
Unidirectional Current-Sense Amplifier, G=25V/V, 250µV VOS No — No No
TSM9634W
Unidirectional Current-Sense Amplifier, G=200V/V, 250µV VOS No — No No
TSM9938F
Unidirectional Current-Sense Amplifier, G=50V/V, 500µV VOS No — No No
TSM9938H
Unidirectional Current-Sense Amplifier, G=100V/V, 500µV VOS No — No No
TSM9938T
Unidirectional Current-Sense Amplifier, G=25V/V, 500µV VOS No — No No
TSM9938W
Unidirectional Current-Sense Amplifier, G=200V/V, 500µV VOS No — No No

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