nanoPower, 4-Bump UCSP/SOT23, Precision Current-Sense Amplifier

The MAX9634 high-side current-sense amplifier offers precision accuracy specifications of VOS less than 250µV (max) and gain error less than 0.5% (max). Quiescent supply current is an ultra-low 1µA. The MAX9634 fits in a tiny, 1mm x 1mm UCSP™ package size or a 5-pin SOT23 package, making the part ideal for applications in notebook computers, cell phones, PDAs, and all battery-operated portable devices where accuracy, low quiescent current, and small size are critical.

The MAX9634 features an input common-mode voltage range from 1.6V to 28V. These current-sense amplifiers have a voltage output and are offered in four gain versions: 25V/V (MAX9634T), 50V/V (MAX9634F), 100V/V (MAX9634H), and 200V/V (MAX9634W).

The four gain selections offer flexibility in the choice of the external current-sense resistor. The very low 250µV (max) input offset voltage allows small 25mV to 50mV full-scale VSENSE voltage for very low voltage drop at full-current measurement.

The MAX9634 is offered in tiny 4-bump UCSP (1mm x 1mm x 0.6mm footprint) and 5-pin SOT23 packages.

Applications

* Cell Phones * Notebook Computers * PDAs * Portable/Battery-Powered Systems * Power-Management Systems

* Ultra-Low Supply Current of 1µA (max)

* Low 250µV (max) Input Offset Voltage

* Low < 0.5% (max) Gain Error

* Input Common Mode: +1.6V to +28V

* Voltage Output

* Four Gain Versions Available

* 25V/V (MAX9634T)

* 50V/V (MAX9634F)

* 100V/V (MAX9634H)

* 200V/V (MAX9634W)

* Tiny 1mm x 1mm x 0.6mm, 4-Bump UCSP or 5-Pin SOT23 Packages