Datasheet ISL81802 80V Dual Synchronous Buck Controller The ISL81802 is a dual synchronous buck controller Features that generates two independent outputs or one output Wide input voltage range: 4.5V to 80V with two interleaved phases for a wide variety of Wide output voltage range: 0.8V to 76V applications in industrial and general purpose segments. With a wide input and output voltage Four MOSFET drivers with adaptive shoot-through ranges, the controller is suitable for protection telecommunication, data center, and computing Constant output voltage and output current applications. feedback loop control The ISL81802 uses peak current mode control with Light-load efficiency enhancement phase interleaving for the two outputs. Each output has a voltage regulator, current monitor, and average Low ripple diode emulation and burst mode current regulator to provide independent average operation voltage and current control. The internal Programmable soft-start Phase-Locked Loop (PLL) oscillator assures an Supports startup into pre-biased rails accurate frequency setting from 100kHz to 1MHz, and the oscillator can be synchronized to an external clock Programmable frequency: 100kHz to 1MHz signal for frequency synchronization and phase Supports current sharing with cascade phase interleave paralleling applications. This PLL circuit interleaving can output a phase-shift-programmable clock signal External clock sync that is expanded to three, four, and six phases with required interleaving phase shift. Clock out with accurate phase angle controlled by PLL or frequency dithering The ISL81802 features programmable soft-start and accurate threshold enable functions along with a PGOOD indicator power-good indicator to simplify power supply rail Output current monitor sequencing. It also provides full protection features such as OVP, UVP, OTP, and average and peak Selectable mode between PWM/DE/Burst current limit on both outputs to ensure high reliability. Accurate EN/UVLO threshold: 2% The IC is packaged in a spac- conscious 32 Ld Low shut down current: 5A 5mmx5mm TQFN or an easy to assemble Complete protection: OCP (pulse by pulse and 4.4mmx9.7mm 38 Ld HTSSOP package. Both optional hiccup or constant current mode), OVP, packages use an EPAD to improve thermal OTP, and UVP performance and noise immunity. The full feature design with low pin count makes the ISL81802 an Applications ideal solution for quick time to market simple power supply designs. Telecommunication Server and data center Related Literature Automotive electronics For a full list of related documents, visit our website: Industrial equipment ISL81802 device page Power system R16DS0033EU0101 Rev.1.01 Page 1 of 44 Oct.15.20ISL81802 VIN VDD VDD PGND BOOT1 SGND ISL81802 TQFN VCC5V UG1 PLL COMP VOUT CLKOUT/DITHER PHASE1 RT/SYNC LG1/PWM MODE FB1 EPAD VDD COMP1 BOOT2 SS/TRK1 UG2 SS/TRK2/OV PHASE2 COMP2/CLKEN FB2/PFMEN LG2/OC MODE Figure 1. Typical Application Diagram 100 98 96 94 92 90 88 86 Vin = 18V Vin = 24V 84 Vin = 36V Vin = 48V 82 Vin = 60V Vin = 80V 80 0 5 10 15 20 Output Current (A) Figure 2. Efficiency (V = 12V, CC Mode) OUT R16DS0033EU0101 Rev.1.01 Page 2 of 44 Oct.15.20 IMON1 IMON2 EN/UVLO2 PGOOD Efficiency (%) EXTBIAS EN/UVLO1 VIN CS2- CS1- CS2+ CS1+