General Description

The MAX9934** high-precision, low-voltage, high-side current-sense amplifier is ideal for both bidirectional (charge/discharge) and unidirectional current measure ments 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.

Features

♦ 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 (2mm x 2mm x 0.6mm), and 8-Pin µMAX Packages

Applications

  PDAs and Smartphones

  MP3 Players

  Sensor Instrumentation Amplifiers

  Notebook PCs and Ultra-Mobile PCs

  Portable Current Monitoring