Users Manual ISL8274MEVAL1Z Users Manual: Evaluation Board Industrial Analog and Power Rev 0.00 Jan 2018USERS MANUAL ISL8274MEVAL1Z UG156 Rev.0.00 Evaluation Board Jan 9, 2018 1. Overview The ISL8274M is a dual-channel, step-down DC/DC power supply module capable of delivering up to 30A per channel. With an integrated digital PWM controller, synchronous power switches, an inductor and passives, only input and output capacitors are needed to finish the design. A set of optional external resistors allows the user to easily configure the device for standard operation. For advanced configurations, a standard PMBus interface addresses tasks such as sequencing and fault management, as well as real-time full telemetry and point-of-load monitoring. The ISL8274M uses ChargeMode control architecture, which responds to a transient load within a single switching cycle. Operating across an input voltage range from 4.5V to 14V, the ISL8274M offers adjustable output voltage from 0.6V to 5V. The ISL8274MEVAL1Z evaluation board is a 4.0inx4.5in 8-layer FR4 board with 2oz. copper on top and bottom layer and 1oz. copper in buried layers. This evaluation board comes with a placeholder for pin-strap resistors to adjust output voltage, switching frequency, input Undervoltage Lockout (UVLO) protection threshold, device PMBus address, overcurrent limit, ASCR setting, and soft start setting. More configurations can be easily programmed or changed using a PMBus compliant serial bus interface. The ZLUSBEVAL3Z (USB to PMBus adapter) is provided with this evaluation board, which connects the evaluation board to a PC to activate the PMBus communication interface. The PMBus command set is accessed by using the PowerNavigator evaluation software from a PC running Microsoft Windows. The ISL8274MEVAL1Z can operate in Pin-Strap mode without needing the ZLUSBEVAL3Z adapter or PMBus communication. 1.1 Key Features V range of 4.5V to 14V, V adjustable from 0.6V to 5V. Up to 95.5% efficiency IN OUT Programmable V , margining, UVP/OVP, OTP/UTP, I limit, soft-start/stop, sequencing, and external OUT OUT synchronization Monitor: V , V , I , temperature, duty cycle, switching frequency, and faults IN OUT OUT ChargeMode control tunable with PMBus Mechanical switch for enable and power-good LED indicator 1.2 Specifications This board has been configured and optimized for the following operating conditions: V = 5V to 12V IN V = 1.5V OUT I = 30A per channel, IOUT avg OCP = 35A per channel MAX f = 889kHz SW ASCR gain = 525, ASCR residual = 90 On/off delay = 5ms (Ch1), 5ms (Ch2), on/off ramp time = 2ms (Ch1), 5ms (Ch2) Input UVLO = 4.5V PMBus address = 0x28h UG156 Rev.0.00 Page 2 of 24 Jan 9, 2018