DATASHEET ISL62871, ISL62872 FN6707 Rev 1.00 PWM DC/DC Controller With VID Inputs For Portable GPU Core-Voltage May 8, 2014 Regulator The ISL62871 and ISL62872 ICs are Single-Phase Features Synchronous-Buck PWM voltage regulators featuring 3 Input Voltage Range: 3.3V to 25V Intersils Robust Ripple Regulator (R ) Technology. The wide 3.3V to 25V input voltage range is ideal for systems Output Voltage Range: 0.5V to 3.3V that run on battery or AC-adapter power sources. The Output Load up to 30A ISL62871 and ISL62872 are low-cost solutions for Extremely Flexible Output Voltage Programmability applications requiring dynamically selected slew-rate controlled output voltages. The soft-start and dynamic - 2-Bit VID (ISL62872) Selects Four Independent Setpoint Voltages setpoint slew-rates are capacitor programmed. Voltage identification logic-inputs select two (ISL62871) or four - 1-Bit VID (ISL62871) Selects Two Independent Setpoint Voltages (ISL62872) resistor-programmed setpoint reference voltages that directly set the output voltage of the converter between - Simple Resistor Programming of Setpoint Voltages 0.5V to 1.5V, and up to 3.3V using a feedback voltage - Accepts External Setpoint Reference Such as DAC divider. Optionally, an external reference such as the DAC 0.75% System Accuracy: -10C to +100C output from a microcontroller, can be used by either IC to One Capacitor Programs Soft-start and Setpoint Slew-rate program the setpoint reference voltage, and still maintain the controlled slew-rate features. Robust integrated MOSFET Fixed 300kHz PWM Frequency in Continuous Conduction drivers and Schottky bootstrap diode reduce the External Compensation Affords Optimum Control Loop implementation area and lower component cost. Tuning 3 Intersils R Technology combines the best features of Automatic Diode Emulation Mode for Highest Efficiency both fixed-frequency and hysteretic PWM control. The PWM frequency is 300kHz during static operation, becoming Integrated High-current MOSFET Drivers and Schottky Boot-Strap Diode for Optimal Efficiency variable during changes in load, setpoint voltage, and input voltage when changing between battery and AC-adapter Choice of Overcurrent Detection Schemes power. The modulators ability to change the PWM switching - Lossless Inductor DCR Current Sensing frequency during these events in conjunction with external - Precision Resistive Current Sensing loop compensation produces superior transient response. Power-Good Monitor for Soft-Start and Fault Detection For maximum efficiency, the converter automatically enters diode-emulation mode (DEM) during light-load conditions Fault Protection such as system standby. - Undervoltage - Overvoltage - Overcurrent (DCR-Sense or Resistive-Sense Capability) - Over-Temperature Protection - Fault Identification by PGOOD Pull-Down Resistance Pb-Free (RoHS compliant) Applications Mobile PC Graphical Processing Unit VCC rail Mobile PC I/O Controller Hub (ICH) VCC rail Mobile PC Memory Controller Hub (GMCH) VCC rail Built-in voltage margin for system-level test FN6707 Rev 1.00 Page 1 of 25 May 8, 2014ISL62871, ISL62872 Pinouts ISL62872 ISL62871 (20 LD 3.2X1.8 TQFN) (16 LD 2.6X1.8 TQFN) TOP VIEW TOP VIEW PGND 2 19 VCC GND 1 GND 3 18 BOOT 12 BOOT EN 2 11 UGATE EN 4 17 UGATE VID0 3 10 PHASE VID1 5 16 PHASE 4 9 OCSET SREF VID0 6 15 NC SREF 7 14 OCSET SET0 8 13 VO SET1 9 12 FB Ordering Information PART NUMBER PART TEMP RANGE PACKAGE PKG. (Note) MARKING (C) (Pb-Free) DWG. ISL62872HRUZ -T* GAN -10 to +100 20 Ld 3.2x1.8 TQFN L20.3.2x1.8 ISL62871HRUZ -T* GAM -10 to +100 16 Ld 2.6x1.8 TQFN L16.2.6x1.8A *Please refer to TB347 for details on reel specifications. NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets molding compounds/die attach materials and NiPdAu plate - e4 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. FN6707 Rev 1.00 Page 2 of 25 May 8, 2014 SET2 10 1 LGATE PGOOD 11 20 PVCC PGND SET0 5 16 15 LGATE PGOOD 6 FB 7 14 PVCC VO 8 13 VCC