The MAX9934** high-precision, low-voltage, high-side current-sense amplifier is ideal for both bidirectional (charge/discharge) and unidirectional current measurements in battery-powered portable and laptop devices. Input offset voltage (VOS) is a low 10µV (max) at +25°C
across the -0.1V to 5.5V input common-mode voltage range, and is independent of VCC. Its precision input specification allows the use of very small sense-voltages (typically ±10mV full-scale) for minimally invasive
current sensing.
The output of the MAX9934 is a current proportional to input VSENSE and is available in either 25µA/mV or 5µA/mV gain options (GM) with gain accuracy better than 0.25% (max) at +25°C. A chip select (CS) allows
multiplexing of several MAX9934 current outputs to a single microcontroller ADC channel (see the Typical Operating Circuit). CS is compatible with 1.8V and 3.3V logic systems.
The MAX9934 is designed to operate from a 2.5V to 3.6V VCC supply, and draws just 120µA (typ) quiescent current. When powered down (VCC = 0V), RS+ and RS- draw less than 0.1nA (typ) leakage current to reduce battery load. The MAX9934 is robust and protected from input faults of up to ±6V input differential voltage between RS+ and RS-.
The MAX9934 is specified for operation over the -40°C to +125°C temperature range and is available in 8-pin µMAX®, 6-pin µDFN (2mm x 2mm x 0.8mm), or a 6-bump UCSP™ (1mm x 1.5mm x 0.6mm), making it ideal for space sensitive applications.
Key Features
Applications/Uses
Input Offset Voltage: 10µV (max)
Gain Error Less than 0.25%
-0.1V to +5.5V Input Common-Mode Voltage Range
Chip Select Allows Multiplexing Several MAX9934 Current Monitors to One ADC
Current Output Allows ROUT Selection for Gain Flexibility
Single Supply Operation: 2.5V to 3.6V
Two Gain Options: GM of 25µA/mV (MAX9934T) and 5µA/mV (MAX9934F)
Bidirectional or Unidirectional Operation
Small, 6-Bump UCSP (1mm x 1.5mm x 0.6mm), 6-Pin µDFN Packages (2mm x 2mm x 0.6mm), and 8-Pin µMAX
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