SQ52110TDD

Application Note: SQ52110 Current Sensing Comparator with Overcurrent Protection General Description Features The SQ52110 is a current sensing comparator with overcurrent protection and used for the overcurrent protection applications. It measures the voltage across a shunt resistor and compares this voltage with an adjustable threshold set by an external resistor. Independent of the supply voltage, SQ52110 can handle the common voltage range between 0V and 36V and the differential input range from 0mV to 250mV. An open drain alert output can be configured to operate in either a transparent mode where the output status follows the input state or in a latched mode where the alert output is cleared when the latch is cleared. The device response time setting is selectable, which enables overcurrent alerts to be issued in as fast as 10μs. The SQ52110 operates from a single 2.7V to 5.5V supply, drawing a typical supply current of 135μA. It is specified over the extended operating temperature range of –40°C to +125°C, and is available in DFN2×2-10 packages.    Ordering Information SQ52110 □(□□□ ) Package Code      Wide Common Mode Range: 0V to 36V Selectable Response Times: 10μs, 50μs, 100μs Programmable Threshold:  Adjust Using Single Resistor  Programmable from 0 mV to 250 mV Accuracy:  Offset Voltage: ±500μV (Max)  Offset Voltage Drift: 0.5μV/°C (Max) Selectable Hysteresis: 2 mV, 4 mV, 8 mV Active Quiescent Current: 135μA (Typ) Selectable Disable Mode  Disabled Quiescent Current: 1.2μA (Max)  Disabled Input Bias Current: 500nA (Max) Open Drain Output with Latch Mode Available Applications       Overcurrent Protection Computers Servers Telecom Equipment Power Supplies Battery Chargers Optional Spec Code Ordering Number SQ52110TDD Package type Note DFN2×2-10 Typical Application 2.7V to 5.5V RPullup VS Power Supply 0V to 36V ENABLE LATCH IN+ Processor GPIO GPIO + CMP IN- ALERT GPIO LIMIT DAC DELAY Load RLIMIT HYS GND Figure 1. Typical Application AN_SQ52110 Rev. 0.9 © 2021 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 1 All Rights Reserved. AN_SQ52110 Pin out IN+ 1 10 HYS IN- 2 9 VS LIMIT 3 8 GND ENABLE 4 7 DELAY ALERT 5 6 LATCH Thermal Pad Top mark: W2xyz (Device code: W2, x=year code, y=week code, z= lot number code) Pin Number 1 2 3 4 5 6 7 8 9 10 Thermal pad Pin Name IN+ INLIMIT ENABLE ALERT LATCH DELAY GND VS HYS Function Description Connect to supply side of shunt resistor Connect to load side of shunt resistor Alert threshold limit input Enable or disable selection input Overlimit alert, active-low, open-drain output Transparent or latch mode selection input Response time selection input Ground Power supply, 2.7 V to 5.5 V Hysteresis setting input This pad can be connected to ground or left floating. Absolute Maximum Ratings (Note 1) VS---------------------------------------------------------------------------------------------------------------------------- -0.3V~6V Differential VIN+ - VIN- -------------------------------------------------------------------------------------------------- -40V~40V Common mode, VIN+, VIN- --------------------------------------------------------------------------------------------- -0.3V~40V Alert output VALERT ------------------------------------------------------------------------------------------------------- -0.3V~6V Input voltage at Any Pin------------------------------------------------------------------------------------------ -0.3V~VS+0.3V Operating Temperature ------------------------------------------------------------------------------------------------- -40~125°C Maximum Junction Temperature ------------------------------------------------------------------------------------------- 150°C Storage Temperature Range --------------------------------------------------------------------------------------- -65°C ~ 150°C ESD Susceptibility HBM (Human Body Mode) -------------------------------------------------------------------------------------------------- ±2kV CDM (Charged Device Mode) ----------------------------------------------------------------------------------------------- ±1kV Recommended Operating Conditions VS---------------------------------------------------------------------------------------------------------------------------------- 3.3V Common mode, VIN+, VIN- ------------------------------------------------------------------------------------------------------ 12V Delay setting ------------------------------------------------------------------------------------------------------------------- 100μs Operating free-air Temperature---------------------------------------------------------------------------------------- -40~125°C AN_SQ52110 Rev. 0.9 © 2021 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 2 All Rights Reserved. AN_SQ52110 Electrical Characteristics At TA=25°C, VIN=VIN+–VIN–=0mV, VS=3.3V, VIN+=12V, VLIMIT=10mV, and DELAY=100μs, unless otherwise noted. Symbol Parameter Conditions Min Typ Max Units 0 36 V 0 250 mV Input VCM Common Mode Input Voltage VIN Differential Input Voltage VIN=VIN+-VIN- CMR Common Mode Rejection VIN=0V~36V, TA=-40°C~+125°C VS=3.3V, DELAY=100μs VS=3.3V, DELAY=50μs VS=3.3V, DELAY=10μs TA=-40°C~+125°C VS=2.7V~5.5V, VIN+=12V, TA=-40°C~+125°C VOS Offset Voltage, RTI dVOS/dT Offset Voltage Drift, RTI PSR Power Supply Rejection Ratio IB Input Bias Current(1) IOS Input Offset Current(2) ILIMIT Limit Threshold Output Current 110 Disable mode TA=25°C TA=-40°C~+125°C 19.85 19.8 120 -75 -125 -350 0.1 -500 -500 -650 0.5 dB μV/°C 5 60 μV/V 3.5 0.05 ±0.1 20 8 0.5 μA μV μA 20.15 20.2 μA Digital Input/Output tp Alert Propagation Delay HYS Hysteresis Delay=open, overdrive(3)=1mV 10 Delay=GND, overdrive=1mV 50 Delay=VS, overdrive=1mV 100 HYS=open 2 HYS=GND 4 HYS=VS 8 Latch, enable μs mV 1.4 6 VS-0.5 6 Latch, enable 0 0.4 Delay, hysteresis 0 0.5 VIH High Level Input Voltage VIL Low Level Input Voltage VOL Alert Low Level Output Voltage IOL=3mA 50 100 mV ALERT Terminal Leakage Input Current VOH=3.3V 0.1 1 μA 1 2 μA 135 155 0.6 1.2 Digital Leakage Input Current Delay, hysteresis Pin ENABLE, LATCH, DELAY and HYS, 0