High Precision, Low Voltage Current Sense Amplifier MAX9934 Data Sheet and Circuit
Overview
The MAX9934 is primarily used for bidirectional (charge/discharge), unidirectional current measurement in battery-powered portable devices and notebooks. At +25°C, the input offset voltage (VOS) is only 10μV (max) over the entire -0.1V to 5.5V input common-mode voltage range and is independent of VCC. The device's high-precision input parameters allow the use of very small sense voltages (typically ±10mV full scale) to support minimum leakage current detection.
The MAX9934 outputs a current signal proportional to the input VSENSE, providing a gain selection of 25μA/mV or 5μA/mV (GM) with a gain accuracy of better than 0.25% (max) at +25°C. A Chip Select (CS) signal allows multiple current outputs of the MAX9934 to be multiplexed into the ADC channel of a single microcontroller (see the Typical Operating Circuit). CS is compatible with 1.8V and 3.3V logic systems.
The MAX9934 operates from a 2.5V to 3.6V VCC supply and has a quiescent current of only 120μA (typ). At power-down (VCC = 0V), RS+ and RS- leakage currents are less than 0.1nA (typ), reducing battery load. The MAX9934 is extremely reliable, with input differential voltage fault protection up to ±6V between RS+ and RS-.
The MAX9934 operates over the -40°C to +125°C temperature range and is available in an 8-pin μMAX? or 6-bump UCSP? (1mm x 1.5mm x 0.6mm) package ideal for space-constrained systems.
Key characteristics
Input offset voltage: 10μV (max)
Gain error is less than 0.25%
-0.1V to +5.5V Input Common-Mode Voltage Range Chip Select Signal Allows Multiple MAX9934 Current Detectors to Be Multiplexed to One ADC
Current output allows selection of ROUT for maximum gain flexibility Single-supply operation: 2.5V to 3.6V
2 gain options: GM is 25μA/mV (MAX9934T) and 5μA/mV (MAX9934F)
Bidirectional or Unidirectional Work Small 6-Ball UCSP (1mm x 1.5mm x 0.6mm) and 8-Lead μMAX Package
Application/use
MP3 player
Notebook PC and Super Mobile PC
PDA and smart phone
Portable current monitoring
Sensor instrumentation amplifier
Typical Application Circuit for the MAX9934
The MAX9934 data sheet can be found in the PDF file. For more information, please visit:
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