ZXCT1041E5TA Diodes Incorporated

ZXCT1041 Bidirectional precision high-side current monitor Description The ZXCT1041 is a bidirectional precision high- The very low offset voltage enables a typical side current sense monitor. The output voltage accuracy of 2% for sense voltages of only is proportional to the differential input voltage. 10mV, giving better tolerances for small sense Direction of current flow is indicated by the resistors necessary at higher currents. Flag pin. The wide input voltage range of 20V down to The ZXCT1041 provides a fixed gain of 10 for as low as 2.7V make it suitable for a range of applications where minimal external applications. components are required. A minimum operating current of just 40 A, combined with a SOT23-5 package makes the ZXCT1041 particularly suitable for portable battery equipment. Applications Features Battery management Bidirectional high side measurement Over current monitor Output voltage scaling x10 Battery gas gauging 2.7V to 20V high side voltage Motor control 35A quiescent current 1% typical accuracy SOT23-5 package Typical application circuit Pin connections V - R IN S V + IN 4 5 S- S+ Flag S- Flag 1 ZXCT1041 GND GND OUT 2 3 OUT S+ V OUT Ordering information Order code Package Partmark Reel size Tape width Quantity (inches) (mm) per reel ZXCT1041E5TA SOT23-5 1041 7 8 3000 Issue 2 - January 2008 1 www.zetex.com Zetex Semiconductors plc 2008ZXCT1041 Absolute maximum ratings Voltage on V and V -0.6 to 20V S- S+ Voltage on all other pins -0.6V to (V or V ) +0.6V S+ S- V (V ) - (V ) +/-6V sense S+ S- Operating temperature, T -40 to 125C A Storage temperature -55 to 150C Maximum junction temperature, T 150C J Package power dissipation 300mW at T = 25C (De-rate to zero at 150C) A Operation above the absolute maximum rating may cause device failure. Operation at the absolute maximum ratings, for extended periods, may reduce device reliability. Recommended operating conditions Parameter Min. Max. Units V Common-mode sense input range 2.7 20 V S Flag Current direction flag output 0 V V S V Differential sense input voltage range 0 0.8 V SENSE V Output voltage range 0 V -1.5 V OUT S T Ambient temperature range -40 125 C A Pin function table Pin Name Description 1Flag This is the current direction pin. It is open collector and allows the logic high level to be set independent of V voltage. Low indicates V is greater than V S+ S+ S- 2 GND Ground pin 3 OUT Output voltage pin 4 S+ This is the positive input of the current monitor. It also acts as the supply voltage pin providing current for internal circuitry. The current through this pin varies with differential sense voltage 5 S- This is the negative input of the current monitor. The current through this pin varies with differential sense voltage Issue 2 - January 2008 2 www.zetex.com Zetex Semiconductors plc 2008