NCP1589D Low Voltage Synchronous Buck Controller with Light Load Efficiency and Transient Enhancement www.onsemi.com The NCP1589D is a low cost PWM controller designed to operate from a 5 V or 12 V supply. This device is capable of producing an MARKING output voltage as low as 0.8 V and converting voltage from as low as DIAGRAM 2.5 V. It is easy to operate and provides an optimal level of integration to reduce size and cost of the power supply. It operates in Ramp Pulse 1589D Modulation mode for superior load step and release response. In DFN10 ALYW addition to fast transient response, it also includes a 1.5 A gate driver CASE 485C design and light load efficiency features such as adaptive nonoverlap circuitry and diode emulation. It normally operates at a range of 1589D = Specific Device Code A = Assembly Location 200500 kHz in continuous current conduction mode, which reduces L = Wafer Lot with current at light load for further power saving. Protection features Y = Year include programmable overcurrent protection, output overvoltage and W = Work Week undervoltage protection and input undervoltage lockout (UVLO). = PbFree Device (Note: Microdot may be in either location) Features V Range from 4.5 V to 13.2 V CC Adjustable Operating frequency PIN CONNECTIONS Boost Pin Operates to 35 V Ramp Pulse Modulation Control 1 PGOOD BOOT 10 Precision 0.8 V Internal Reference LX 2 9 VORPM Adjustable Output Voltage 3 UG 8 FB Internal 1.5 A Gate Drivers LG 4 7 COMP/DISB 80% Max Duty Cycle Flag GND 5 V 6 Input Under Voltage Lockout CC Programmable Current Limit (Top View) Adaptive Diode Mode Emulation in Light Load This is a PbFree Device ORDERING INFORMATION Applications Device Package Shipping Graphics Cards Desktop Computers NCP1589DMNTWG DFN10 3000 / (PbFree) Tape & Reel Servers / Networking DSP & FPGA Power Supply For information on tape and reel specifications, including part orientation and tape sizes, please DCDC Regulator Modules refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. Semiconductor Components Industries, LLC, 2017 1 Publication Order Number: January, 2017 Rev. 2 NCP1589D/DNCP1589D V = 4.5 V 13.2 V V = 4.5 V 15 V V = 2.5 V 19 V CC BST IN VCC PGOOD BOOT COMP/DISB UG R2 C1 VOUT LX C2 FB LG FLAG GND VORPM C3 R4 R1 R3 R9 R10 GND Figure 1. Typical Application Diagram PGOOD 10 PGOOD 9 VORPM 10% of V ref MONITOR OV and UV 25% of V ref 0.8 V (V ) ref POR VCC 6 UVLO + VOCP FAULT LATCH FB 8 1 BOOT FAULT + R + PWM UG Q 3 OUT 0.8 V S (V ) ref 2 LX + RPMSET 2 V + RAMP LX COMP VPRM VCC VORPM LG COMP/DISB 7 4 FAULT 5 GND AZCD logic LX Figure 2. Detailed Block Diagram www.onsemi.com 2 ROCSET