ZXCT1021 Low offset high-side current monitor Description The ZXCT1021 is a precision high-side current giving better tolerances for small sense sense monitor. Using this type of device resistors necessary at higher currents. eliminates the need to disrupt the ground The wide input voltage range of 20V down to as plane when sensing a load current. low as 2.5V make it suitable for a range of The ZXCT1021 provides a fixed gain of 10 for applications. With a minimum operating applications where minimal sense voltage is current of just 25A, combined with its SOT23- required. 5 package make it suitable for portable battery equipment too. The very low offset voltage enables a typical accuracy of 3% for sense voltages of only 10mV, Features Applications Accurate high-side current sensing Battery chargers Output voltage scaling Smart battery packs 2.5V 20V supply range DC motor control 25 A quiescent current Over current monitor 1% typical accuracy Power management SOT23-5 package Level translating Programmable current source Pinout information Typical application circuit NC V - SENSE GND V + V SENSE OUT Pinout - top view Ordering information Order reference Package Device Status Reel size Quantity Tape width marking (inches) per reel (mm) ZXCT1021E5TA SOT23-5 1021 Released 7 3000 8 Issue 9 - July 2007 1 www.zetex.com Zetex Semiconductors plc 2007ZXCT1021 Absolute maximum ratings Voltage on any pin -0.6V to 20V with respect to END pin V -0.6V to V +0.5V SENSE IN Operating temperature -40 to 85C Storage temperature -55 to 150C Package power dissipation (T = 25C) amb SOT23-5 300mW Pinout information Pin name Pin function N/C Not internally connected GND Ground V Voltage output referenced to GND. Intended to drive high impedance loads OUT V High impedance negative sense voltage input - SENSE V Supply and positive sense voltage input SENSE+ Issue 9 - July 2007 2 www.zetex.com Zetex Semiconductors plc 2007