MAX9929

19-4251; Rev 0; 8/08 -0.1V to +28V Input Range, Micropower, Uni-/Bidirectional, Current-Sense Amplifiers www.datasheet4u.com General Description Features ♦ Wide -0.1V to +28V Common-Mode Range, Independent of Supply Voltage ♦ 2.5V to 5.5V Operating Supply Voltage ♦ 20µA Quiescent Supply Current ♦ 0.4mV (max) Input Offset Voltage ♦ Gain Accuracy Better than 1% (max) ♦ SIGN Output Indicates Current Polarity ♦ Two IOUT Transconductance Versions Available 2µA/mV (MAX9928T) 5µA/mV (MAX9928F) ♦ Two VOUT Gain Versions Available 20V/V (MAX9929T) 50V/V (MAX9929F) ♦ Pin Compatible with the MAX4372 in UCSP ♦ Available in Ultra-Small 3x2 UCSP (1mm x 1.5mm) and 8-Pin µMAX Packages MAX9928/MAX9929 The MAX9928/MAX9929 low-cost, uni-/bidirectional, high-side, current-sense amplifiers are ideal for monitoring battery charge and discharge currents in notebooks, cell phones, and other portable equipment. These devices feature a wide -0.1V to +28V input common-mode voltage range, low 20µA supply current with VOS less than 0.4mV, and a gain accuracy better than 1.0%. The input common-mode range is independent of the supply voltage, ensuring that the current-sense information remains accurate even when the measurement rail is shorted to ground. The MAX9928F/MAX9928T feature a current output with transconductance ratios of 5µA/mV and 2µA/mV, respectively. An external resistor converts the output current to a voltage, allowing adjustable gain so that the input sense voltage can be matched to th...