Low Voltage OR-ing FET Controller ISL6146 Features The ISL6146 represents a family of OR-ing MOSFET controllers OR-ing Down to 1V and Up to 20V with ISL6146A, ISL6146B, capable of OR-ing voltages from 1V to 18V. Together with suitably ISL6146D and ISL6146E sized N-channel power MOSFETs, the ISL6146 increases power Programmable Voltage Compliant Operation with ISL6146C distribution efficiency when replacing a power OR-ing diode in high VIN Hot Swap Transient Protection Rating to +24V current applications. It provides gate drive voltage for the MOSFET(s) with a fully integrated charge pump. High Speed Comparator Provides Fast <0.3s Turn-off in The ISL6146 allows users to adjust with external resistor(s) the Response to Shorts on Sourcing Supply V - V trip point, which adjusts the control sensitivity to system OUT IN Fastest Reverse Current Fault Isolation with 6A Turn-off power supply noise. An open drain FAULT pin will indicate if a Current conditional or FET fault has occurred. Very Smooth Switching Transition The ISL6146A and ISL6146B are optimized for very low voltage operation, down to 1V with an additional independent bias of 3V Internal Charge Pump to Drive N-channel MOSFET or greater. User Programmable V - V Vth for Noise Immunity IN OUT The ISL6146C provides a voltage compliant mode of operation Open Drain FAULT Output with Delay down to 3V with programmable Undervoltage Lock Out and - Short between any two of the OR-ing FET Terminals Overvoltage Protection threshold levels - GATE Voltage and Excessive FET V DS The ISL6146D and ISL6146E are like the ISL6146A and ISL6146B - Power-Good Indicator (ISL6146C) respectively but do not have conduction state reporting via the fault output. MSOP and DFN Package Options TABLE 1. KEY DIFFERENCES BETWEEN PARTS IN FAMILY Applications PART NUMBER KEY DIFFERENCES N+1 Industrial and Telecom Power Distribution Systems ISL6146A Separate BIAS and VIN with Active High Enable Uninterruptable Power Supplies ISL6146B Separate BIAS and VIN with Active Low Enable Low Voltage Processor and Memory ISL6146C VIN with OVP/UVLO Inputs Storage and Datacom Systems ISL6146D ISL6146A wo Conduction Monitor & Reporting ISL6146E ISL6146B wo Conduction Monitor & Reporting + C Q1 O + M M O N VIN GATE VOUT P VOLTAGE GATE FAST OFF, ~200ns FALL TIME BIAS ADJ O DC/DC W ~70ns FROM 20V TO 12.6V ACROSS 57nF ISL6146B (3V - 20V) E GATE OUTPUT SINKING ~ 6A FLT R B EN GND U S - + C Q2 O M + M O N VIN GATE VOUT VOUT P VOLTAGE BIAS ADJ O DC/DC W ISL6146B (3V - 20V) E FLT R B EN GND U S - FIGURE 1. TYPICAL APPLICATION FIGURE 2. ISL6146 GATE HIGH CURRENT PULL-DOWN April 26, 2013 CAUTION: These devices are sensitive to electrostatic discharge follow proper IC Handling Procedures. 1 1-888-INTERSIL or 1-888-468-3774 Copyright Intersil Americas LLC 2011-2013. All Rights Reserved FN7667.4 Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners.+ - ISL6146 Block Diagram FAULT DIAGNOSTIC Q-PUMP BIAS 1. V - V > 570mV IN OUT 2. GATE - V < 220mV (A,B,C only) FLT IN VDS FORWARD 3. TEMP > +150C + REGULATOR VIN 4. V < POR (ISL6146A/B/D/E) BIAS GATE 5. V OR V < POR (ISL6146C) IN OUT 6. V < V 19mV IN OUT VOUT 7. Gate to Drain and Gate to Source Shorts REVERSE DETECTION COMPARATOR 57mV + + UVLO 8mA EN/EN ENABLE EN ENABLE * + OVP V REF - 4A + ADJ HIGH SPEED + COMPARATOR + ISL6146A/B/D/E V REF - * Connected to BIAS on ISL6146A/B/D/E Connected to VOUT on ISL6146C ISL6146C Pin Configuration ISL6146 (8 LD MSOP/DFN) TOP VIEW ISL6146A, ISL6146B, ISL6146D, ISL6146E ISL6146C GATE 1 8 VOUT GATE 1 8 VOUT VIN 2 7 VIN 7 ADJ 2 ADJ BIAS 6 6 FAULT 3 FAULT 3 UVLO EN ISL6146A/D 4 5 GND 5 GND 4 OVP EN ISL6146B/E EPAD on DFN only, connect to GND Pin Descriptions MSOP/ DFN SYMBOL DESCRIPTION 1 GATE Gate Drive output to the external N-Channel MOSFET generated by the IC internal charge pump. Gate turn-on time is typically <1ms. Allows active control of external N-Channel FET gate to perform OR-ing function. The GATE drive is between V + 7V at V = 3.3V and V +12V at V = 18V. IN IN IN IN 2 VIN Connected to the sourcing supply side (OR-ing MOSFET Source), this pin serves as the sense pin to determine the ORd supply voltage. The OR-ing MOSFET will be turned off when V becomes lower than V by a value more than the externally IN OUT set threshold or the defaulted internal threshold. Range: 0V to 24V 3 BIAS Primary bias pin. Connected to an independent voltage supply greater than or equal to 3V and greater than V . IN ISL6146A Range: 3.0 to 24V ISL6146B ISL6146D ISL6146E 3 UVLO Programmable UVLO protection to prevent premature turn-on prior to VIN being adequately biased. Range: 0V to 24V ISL6146C 4 EN Active high enable input to turn on the FET. Internally pulled low to GND through 2M. ISL6146A Range: 0V to 24V ISL6146D FN7667.4 2 April 26, 2013 + -