60A Exposed Top Integrated PowIRstage IR3575 FEATURES DESCRIPTION The IR3575 exposed-top integrated PowIRstage is a Peak efficiency up to 95% at 1.2V synchronous buck gate driver co-packed with a control Integrated driver, control MOSFET, synchronous MOSFET and a synchronous MOSFET with integrated MOSFET and Schottky diode Schottky diode. It is optimized internally for PCB layout, Input voltage (VIN) operating range up to 15V heat transfer and driver/MOSFET timing. Custom designed gate driver and MOSFET combination enables higher Output voltage range from 0.25V to Vcc-2.5V, or to efficiency at lower output voltages required by cutting 5.5V if internal current sense amplifier is not used edge CPU, GPU and DDR memory designs. Output current capability of 60A DC Up to 1.0MHz switching frequency enables high Operation up to 1.0MHz performance transient response, allowing miniaturization Integrated current sense amplifier of output inductors, as well as input and output capacitors VCC under voltage lockout while maintaining industry leading efficiency. The IR3575s superior efficiency enables smallest size and lower solution Thermal flag cost. The IR3575 PCB footprint is compatible with the Body-Braking load transient support IR3550 (60A), IR3551 (50A) and IR3553 (40A). Diode-emulation high efficiency mode Integrated current sense amplifier achieves superior Compatible with 3.3V PWM logic and VCC tolerant current sense accuracy and signal to noise ratio vs. best-in- Compliant with Intel DrMOS V4.0 class controller based Inductor DCR sense methods. PCB footprint compatible with IR3550 and IR3551 The IR3575 incorporates the Body-Braking feature which Enhanced top side cooling through exposed pad enables reduction of output capacitors. Synchronous diode emulation mode in the IR3575 removes the zero-current Small 6mm x 6mm x 0.9mm PQFN package detection burden from the PWM controller and increases Lead free RoHS compliant package system light-load efficiency. The IR3575 is optimized specifically for CPU core power APPLICATIONS delivery in server applications. The ability to meet the stringent requirements of the server market also makes Voltage Regulators for CPUs, GPUs, and DDR memory arrays the IR3575 ideally suited to powering GPU and DDR memory designs and other high current applications. High current, low profile DC-DC converters 95 20 BASIC APPLICATION 93 18 91 16 89 14 IR3575 VIN VCC VCC VIN 87 12 4.5V to 15V 4.5V to 7V BOOST 85 10 83 8 VOUT PHSFLT PHSFLT SW 81 6 PWM PWM 79 4 BBRK BBRK 77 2 REFIN REFIN CSIN+ 75 0 IOUT IOUT CSIN- 0 5 10 15 20 25 30 35 40 45 50 55 60 LGND PGND Output Current (A) Figure 2: Typical IR3575 Efficiency & Power Loss (See Note 2 on Page 8) Figure 1: IR3575 Basic Application Circuit 1 September 6, 2017 DATASHEET V3.4 Efficiency (%) Power Loss (W)60A Exposed Top Integrated PowIRstage IR3575 PINOUT DIAGRAM ORDERING INFORMATION Package Tape & Reel Qty Part Number PQFN, 32 Lead 3000 IR3575MTRPBF 6mm x 6mm Package Qty Part Number PQFN, 32 Lead 100 IR3575MPBF 6mm x 6mm Figure 3: IR3575 Pin Diagram, Top View TYPICAL APPLICATION DIAGRAM VCC VIN C3 C1 C2 4.5V to 15V 4.5V to 7V 1uF 3 18-23 0.1uF 10uF x 2 R1 VCC VIN 10k IR3575 25 PHSFLT PHSFLT 24 C5 BOOST L1 26 PWM 0.22uF PWM 150nH C6 C7 Gate 22uF 470uF 27 BBRK SW BBRK Drivers VOUT C9 6-15 and 22nF Optional for Current 28 LGND diode emulation Sense R2 C4 setup 2.49k 0.22uF 29 REFIN Amplifier REFIN 16, 17 PGND C8 30 IOUT PGND 1nF 4 IOUT TGND CSIN- CSIN+ 31 1 2 No Connect Figure 4: Application Circuit with Current Sense Amplifier 2 September 6, 2017 DATASHEET V3.4