PGND PWRGD PGND FREQ OUT IN IN FB IN COMP EN GND Buck Converter - High-Efficiency, Synchronous 4 A, 6 A, 2 MHz NCP1594A, NCP1594B www.onsemi.com The NCP1594 is a high output current synchronous PWM converter that integrates two Nchannel Power MOSFETs. The MARKING NCP1594 utilizes externally compensated voltage mode control to DIAGRAM provide good transient response, ease of implementation, and excellent loop stability. It regulates input voltages from 2.9 V to 6.0 V 24 PIN WQFN NCP down to an output voltage as low as 0.6 V and is able to supply up to 1594x MT SUFFIX ALYW CASE 510BC 4.0 A of load current (NCP1594A). Please contact factory for 1 NCP1594B which supports 6.0 A load current. x = A or B The NCP1594 includes an internal softstart to limit inrush current. A = Assembly Location Other features include cyclebycycle current limit, 92% max duty L = Wafer Lot cycle, shortcircuit protection, and thermal shutdown. Y = Year W = Work Week Features = PbFree Package (Note: Microdot may be in either location) Wide Input Voltage Range from 2.9 V to 6.0 V Nine Preset Output Voltages (0.6 V, 0.7 V, 0.8 V, 1.0 V, 1.2 V, 1.5 V, PIN CONNECTIONS 1.8 V, 2.0 V, and 2.5 V) Adjustable Output Voltage Down to 0.6 V Adjustable 500 kHz to 2 MHz Switching Frequency Externally Adjustable SoftStart and Able to Start Up with 24 23 22 21 20 19 PreBiased Output Load MODE 1 18 PGND Selectable Forced PWM with and without Prebiased Startup VDD 2 17 PGND Compatible with Ceramic, Polymer, and Electrolytic Output CTL1 3 16 LX Capacitors NCP1594 CTL2 4 15 LX CyclebyCycle Current Limiting REFIN 5 14 LX Hiccup Mode ShortCircuit Protection SS 6 13 BST Over Temperature Protection 7 8 9 10 11 12 This is a 24 Pin 4 x 4 mm 0.5P WQFN PbFree Device These are PbFree Devices Typical Applications Telecom and Networking Power Management (Top View) Computing Power Management ORDERING INFORMATION Datacom Power Management Device Package Shipping Point of Load NCP1594AMNTXG WQFN24 4000 / ASIC/CPU/DSP Core and I/O Voltages (PbFree) Tape & Reel DDR Termination Voltage NCP1594BMNTXG** WQFN24 4000 / (PbFree) Tape & Reel For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. **This device is End of Life. Please contact sales for additional information and assistance with replacement devices. Semiconductor Components Industries, LLC, 2016 1 Publication Order Number: March, 2021 Rev. 2 NCP1594/DNCP1594A, NCP1594B EN BST 0.1uF INPUT OUTPUT 0.47uH 2.9V~5.5V 1.8V / 6A IN LX 22uF 22uF PGND PGND CTL1 CTL2 158 560pF VDD OUT 2.2uF NCP1594 20k GND FB 2.67k1500pF PWRGD COMP MODE REFIN 33pF FREQ SS 0.022uF 49.9k Figure 1. Functional Block Diagram 6 5 4 3 2 1 VOLTAGE CONTROL CIRCUITRY EN GND 7 24 VOLTAGE BIAS SHUTDOWN SOFTSTART REFERENCE GENERATOR CONTROL IN COMP 8 23 COMP CLAMPS THERMAL 3.3V LDO UVLO SHUTDOWN CIRCUITRY IN FB 9 22 CURRENTLIMIT ERROR COMPARATOR PWM AMPLIFIER COMPARATOR BST SWITCH CONTROL LOGIC IN OUT 10 21 8k 1Vpp IN PGND FREQ 11 20 OSCILLATOR PGND PWRGD 12 19 SHDN FB CURRENTLIMIT 0.9 x V REFIN COMPARATOR 13 14 15 16 17 18 Figure 2. Functional Block Diagram www.onsemi.com 2 BST SS REFIN LX CTL2 LX MODE LX CTL1 PGND VDD MODE PGND