ZXCT1023DFGTA

ZXCT1023 MICROPOWER FIXED GAIN OF 50 CURRENT MONITOR Description Pin Assignments The ZXCT1023 is a precision high-side current sense TDFN1218-4L monitor. Using this type of device eliminates the need to disrupt the ground plane when sensing a load current. OUT 1 4 S+ The ZXCT1023 has a fixed internal gain of 50 and the only external component required is the external current sense resistor this combined with its 1.2mm x 1.8mm TDFN 3 S- GND 2 package more than quarters the solution size of the ZXCT1010. Top View The wide input voltage range of 20V down to as low as 2.5V makes it suitable for a range of applications. The combination of operation down to 2.5V and just 3.5A quiescent current makes it ideal for single cell Li-Ion/polymer battery charge/discharge measurement applications. Features Applications Accurate high-side current sensing Battery capacity measurement Fixed gain of 50 output scaling Battery chargers 2.5V 20V operating range Over-current monitor 3.5A quiescent current TDFN1218 package Typical Application Circuit S+ R S- S R GT + V OUT R G GND 1 of 8 June 2011 ZXCT1023 Diodes Incorporated www.diodes.com Document number: DS31997 Rev. 3 - 2 ZXCT1023 MICROPOWER FIXED GAIN OF 50 CURRENT MONITOR Pin Descriptions Pin Name Pin Number Description Voltage output. The output voltage is referenced to GND. The overall voltage gain is 50, i.e., 1 OUT V = 50 x V where V = V - V OUT SENSE SENSE S+ S- 2 GND Ground and substrate connection of device 3 S- High impedence negative sense voltage input 4 S+ Positive sense input. Also acts as power supply pin to ZXCT1023 Central Paddle Substrate. Connect to GND Absolute Maximum Ratings Description Rating Unit Voltage on S+ (Note 1) -0.5 to 20 V Voltage on S- (Note 1, 2), OUT(Note 1) -0.5 V +0.5 V S+ V (Note 3) -0.5 to +2.5 V SENSE Junction Temperature -40 to 125 C Storage Temperature -55 to 150 C Package Power Dissipation (T = 25C) A mW TDFN1218 ESD Ratings Human Body Model 2000 V Machine Model 150 V These are stress ratings only. Operation outside the absolute maximum ratings may cause device failure. Operation at the absolute maximum rating for extended periods may reduce device reliability. Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when handling and transporting these devices. Notes: 1. Measured with respect to GND pin 2. Subject to absolute maximum V not being exceeded. SENSE 3. V is defined as the voltage difference across the sense resistor, R . SENSE S 4. The usable V range is limited by the output voltage range and as such will be reduced at lower V values. SENSE S+ Recommended Operating Conditions (T = 25C) A Symbol Parameter Min Max Unit V (Note 1) Common-Mode Sense Input Range 2.5 20 V S+ 380 V Differential Sense Input Voltage Range 0 mV SENSE (Note 4) V V - 1 Output Voltage Range 0 V OUT S- T Ambient Temperature Range -40 85 C A 2 of 8 June 2011 ZXCT1023 Diodes Incorporated www.diodes.com Document number: DS31997 Rev. 3 - 2