DATASHEET ISL62870 FN6708 Rev 0.00 PWM DC/DC Voltage Regulator Controller August 14, 2008 The ISL62870 IC is a Single-Phase Synchronous-Buck Features PWM voltage regulator featuring Intersils Robust Ripple 3 Input Voltage Range: 3.3V to 25V Regulator (R ) Technology. The ISL62870 provides a low cost solution for compact high performance applications.The Output Voltage Range: 0.5V to 3.3V wide 3.3V to 25V input voltage range is ideal for systems Output Load to 30A that run on battery or AC adapter power sources. Resistor Simple Resistor Programming for Output Voltage programmed output voltage setpoint and capacitor programmed soft-start delay allow for fast and easy 0.75% System Accuracy: -10C to +100C implementation. Robust integrated MOSFET drivers and Capacitor Programming for Soft-Start Delay Schottky bootstrap diode reduce the implementation area and lower component cost. Fixed 300kHz PWM Frequency in Continuous Conduction 3 Intersils R Technology combines the best features of External Compensation Affords Optimum Control Loop both fixed-frequency and hysteretic PWM control. The PWM Tuning frequency is 300kHz during static operation, becoming Automatic Diode Emulation Mode for Highest Efficiency variable during changes in load, setpoint voltage, and input Integrated High-Current MOSFET Drivers and Schottky voltage when changing between battery and AC adapter Boot-Strap Diode for Optimal Efficiency power. The modulators ability to change the PWM switching frequency during these events in conjunction with external Choice of Overcurrent Detection Schemes loop compensation produces superior transient response. - Lossless Inductor DCR Current Sensing For maximum efficiency, the converter automatically enters - Precision Resistive Current Sensing diode-emulation mode (DEM) during light-load conditions Power-Good Monitor for Soft-Start and Fault Detection such as system standby. Fault Protection Pinout - Undervoltage ISL62870 - Overvoltage (16 LD 2.6X1.8 TQFN) - Overcurrent (DCR-Sense or Resistive-Sense Capability) TOP VIEW - Over-Temperature Protection - Fault Identification by PGOOD Pull-Down Resistance Pb-Free (RoHS Compliant) GND BOOT 1 12 Applications EN UGATE 2 11 Mobile PC Graphical Processing Unit VCC Rail NC PHASE 3 10 Mobile PC I/O Controller Hub (ICH) VCC Rail 4 OCSET SREF 9 Mobile PC Memory Controller Hub (GMCH) VCC Rail Ordering Information PART NUMBER PART TEMP RANGE PACKAGE PKG. (Note) MARKING (C) (Pb-Free) DWG. ISL62870HRUZ GAL -10 to +100 16 Ld 2.6x1.8 TQFN L16.2.6x1.8A ISL62870HRUZ-T* GAL -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. FN6708 Rev 0.00 Page 1 of 17 August 14, 2008 PGND NC 5 16 PGOOD 15 LGATE 6 FB PVCC 7 14 VCC VO 8 13ISL62870 FN6708 Rev 0.00 Page 2 of 17 August 14, 2008 Block Diagram EN VCC 100k POR FB BOOT V COMP RUN EA RUN PWM FAULT DRIVER UGATE 100pF H PHASE SHOOT-THROUGH L OTP PROTECTION IN V PVCC W PWM DRIVER LGATE RUN PGND VCC VSET g V m IN C r V R SREF g V m O OVP VO OCP FB OCSET FAULT I OCSET UVP 10F VREF GND 500mV PGOOD FIGURE 1. SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM OF ISL62870