Linear Voltage Regulator - Bias Rail, Low Noise, Very Low Dropout, Programmable Soft-Start 3 A www.onsemi.com NCV59745 Description The NCV59745 is very low dropout low noise dualrail voltage regulator that is capable of providing an output current in excess of 3.0 A with a dropout voltage of 115 mV typ. at full load current. This QFNW20 series contains fixed output voltage devices. The high output current MW SUFFIX CASE 484AP capability with high accuracy, broad bandwidth high PSRR and low noise makes this VLDOs ideal for powering noise sensitive high speed communication devices, high end FPGAs and microprocessors. MARKING DIAGRAM The NCV59745 is offered in QFNW20 4.0 mm x 4.0 mm package. Features 59745 Output Current in Excess of 3.0 A V100A ALLYW 0.25% Typical Accuracy Over Line and Load V Range: 0.8 V to 5.5 V IN V Range: 2.2 V to 5.5 V BIAS A = Assembly Location LL = Wafer Lot Output Voltage Range: 0.8 V to 3.6 V Y = Year Dropout Voltage: 105 mV typ. at 3 A W = Work Week Programmable Soft Start = PbFree Package Open Drain Power Good Output (Note: Microdot may be in either location) Low Noise, 6 V Typically RMS Excellent Transient Response PIN CONNECTIONS NCV Prefix for Automotive and Other Applications Requiring Unique Site and Control Change Requirements AECQ100 Qualified and PPAP Capable 20 1 These are PbFree Devices, Wettable Flank for AOI OUT IN SNS EN Applications NC Thermal Pad SS High Speed Analog VCO, DAC, ADC PG BIAS FPGAs, DSPs, SerDes NC NC Imaging Sensors and ASICs Automotive, Telecom and Industrial Equipment Point of Load Regulation NCV59745 ORDERING INFORMATION V IN PG IN See detailed ordering, marking and shipping information on EN RPG page 10 of this data sheet. C IN V OUT OUT BIAS V BIAS C SS SNS OUT GND C SS CBIAS Figure 1. Typical Application Schematic Semiconductor Components Industries, LLC, 2018 1 Publication Order Number: April, 2020 Rev. 3 NCV59745/D NC OUT NC OUT GND GND NC IN NC INNCV59745 Current OUT IN Limit BIAS Active Discharge* V Voltage REF + Reference + - I SS SS SNS C SS Discharge UVLO PG - Hysteresis Internal + EN & Deglitch Controller Thermal Limit 0.9 x V REF *Active output discharge function is present only in NCV59745A option devices. Figure 2. Simplified Schematic Block Diagram Table 1. PIN FUNCTION DESCRIPTION Name QFNW20 Description IN 1517 Unregulated voltage input to the device. EN 14 Enable pin. Driving this pin high enables the regulator. Driving this pin low puts the regulator into shut- down mode. This pin must not be left floating. SS 13 SoftStart pin. A capacitor connected on this pin to ground sets the Soft Start time. BIAS 12 Bias input voltage for error amplifier, reference, and internal control circuits. PG 4 PowerGood (PG) is an opendrain, activehigh output that indicates the status of V . When V OUT OUT exceeds the PG trip threshold, the PG pin goes into a highimpedance state. When V is below this OUT threshold the pin is driven to a lowimpedance state. A pullup resistor from 10 k to 100 k should be connected from this pin to a supply up to 5.5 V. The supply can be higher than the input voltage. Alternatively, the PG pin can be left floating if output monitoring is not necessary. SNS 2 Output voltage sense input pin. This pin must not be left floating. OUT 1, 19, 20 Regulated output voltage. It is recommended that the output capacitor 10 F (effective value). NC 3, 57, 911 No connection. Each one pin is true NC and can be left floating or connected to GND to allow better thermal contact to the PCB topside plane. GND 8, 18 Ground pins. Both these pins must be connected to ground. PAD/TAB Should be soldered to the ground plane for increased thermal performance www.onsemi.com 2