NCP3133A Integrated Synchronous Buck Converter 3 A NCP3133A is a fully integrated synchronous buck converter for www.onsemi.com 3.3 V and 5 V step down applications. It can provide up to 3 A load current. NCP3133A supports high efficiency, fast transient response and provides power good indicator. The control scheme includes two operation modes: FCCM and automatic CCM/DCM. In automatic 1 CCM/DCM mode, the controller can smoothly switch between CCM QFN16 3 x 3, 0.5P and DCM, where converter runs at reduced switching frequency with CASE 485DA much higher efficiency. NCP3133A is available in 3 mm x 3 mm QFN16 pin package. SUGGESTED PIN ARRANGEMENT Features PGND PGND VIN VIN High Efficiency in both CCM and DCM 16 15 14 13 High Operation Frequency at 1.1 MHz Support MLCC Output Capacitor EN VDD 1 12 Small Footprint, 3 mm x 3 mm, 16pin QFN Package NC AGND Up to 3 A Continuous Output Current 2 11 NCP3133A 2.9 V to 5.5 V Wide Conversion Voltage Range PGD 10 FB 3 Output Voltage Range from 0.6 V to 0.84 X Vin Internal 400 s SoftStart VBST 4 9 COMP Automatic PowerSaving Mode 5 67 8 Voltage Mode Control SW SW SW PS Support Pre-bias Startup Functionality Output Discharge Operation MARKING DIAGRAM OverTemperature Protection Builtin OverVoltage, UnderVoltage and Over-Current Protection 3133A Power Good Indicator ALYW This is a PbFree Device Applications 3133A = Specific Device Code A = Assembly Location 5 V Step Down Rail L = Wafer Lot 3.3 V Step Down Rail Y = Year W = Work Week = PbFree Package (Note: Microdot may be in either location) ORDERING INFORMATION See detailed ordering, marking and shipping information in the package dimensions section on page 12 of this data sheet. Semiconductor Components Industries, LLC, 2016 1 Publication Order Number: August, 2019 Rev. 2 NCP3133A/DNCP3133A VIN VBST UVLO OSC NC Ramp Control Logic DRVH & PS PWM Logic SS EN SW COMP VREF + DRVL +E/A Power Good, FB PGND UVP, OVP, UVLO, Overtemperature OCP PGD and Vout discharge UVLO VDD AGND Figure 1. Block Diagram Table 1. PIN DESCRIPTION Pin No. Symbol Description 1 EN Logic control to enabling the switcher. Internally pulled up to VDD with a 1.35 M resistor 2 NC Not connected 3 PGD Open drain power good output 4 VBST Gate drive voltage for high side FET. Connect capacitor from this pin to SW 5, 6, 7 SW Switch node between highside MOSFET and lowside MOSFET 8 PS Mode configuration pin (with 10 A current): Pulled high or floating (internally pulled high): Forced Continuous Conduction Mode Connect with resistor equal to or lower than ()174 k to GND: Automatic CCM/DCM 9 COMP Output of the error amplifier 10 FB Feedback pin. Connect to resistor divider to set up the desired output voltage 11 AGND Analog ground 12 VDD Power supply input for control circuitry 13, 14 VIN Power input for power conversion and gate driver supply 15, 16 PGND Power ground www.onsemi.com 2