ISL78210ARUZ-T7A

DATASHEET ISL78210 FN7583 Rev 1.00 December 4, 2013 Automotive PWM DC/DC Voltage Controller The ISL78210 IC is a Single-Phase Synchronous-Buck PWM voltage controller featuring Intersil’s Robust Ripple Regulator (R3™) Technology. The ISL78210 provides a low cost solution for compact high performance applications. The wide 3.3V to 25V input voltage range is ideal for systems that run on battery or AC adapter power sources. Resistor programmed output voltage setpoint and capacitor programmed soft-start delay allow for fast and easy implementation. Robust integrated MOSFET drivers and Schottky bootstrap diode reduce the implementation area and lower component cost. Intersil’s R3 Technology™ combines the best features of both fixed-frequency and hysteretic PWM control. The PWM frequency is 300kHz during static operation, becoming variable during changes in load, setpoint voltage, and input voltage when changing between battery and AC adapter power. The modulators ability to change the PWM switching frequency during these events in conjunction with external loop compensation produces superior transient response. For maximum efficiency, the converter automatically enters diode-emulation mode (DEM) during light-load conditions such as system standby. Pin Configuration GND 1 13 VCC 14 PVCC 15 LGATE 16 PGND ISL78210 (16 LD 2.6X1.8 µTQFN) TOP VIEW Features • Input Voltage Range: 3.3V to 25V • Output Voltage Range: 0.5V to 3.3V • Output Load to 30A • Simple Resistor Programming for Output Voltage • ±0.75% System Accuracy: -40°C to +105°C • Capacitor Programming for Soft-Start Delay • Fixed 300kHz PWM Frequency in Continuous Conduction • External Compensation Affords Optimum Control Loop Tuning • Automatic Diode Emulation Mode for Highest Efficiency • Integrated High-Current MOSFET Drivers and Schottky Boot-Strap Diode for Optimal Efficiency • Choice of Overcurrent Detection Schemes - Lossless Inductor DCR Current Sensing - Precision Resistive Current Sensing • Power-Good Monitor for Soft-Start and Fault Detection • Fault Protection - Undervoltage - Overvoltage - Overcurrent (DCR-Sense or Resistive-Sense Capability) - Over-Temperature Protection - Fault Identification by PGOOD Pull-Down Resistance • Fully AEC-Q100 tested • Pb-Free (RoHS Compliant) 12 BOOT Applications 9 OCSET • Automotive PC Memory Controller Hub (GMCH) VCC Rail FN7583 Rev 1.00 December 4, 2013 VO 8 • Automotive PC I/O Controller Hub (ICH) VCC Rail SREF 4 FB 7 • Automotive PC Graphical Processing Unit VCC Rail PGOOD 6 11 UGATE 10 PHASE NC 5 EN 2 NC 3 Page 1 of 17 ISL78210 Pin Descriptions PIN SYMBOL DESCRIPTION 1 GND 2 EN Enable input for the IC. Pulling EN above the VENTHR rising threshold voltage initializes the soft-start sequence. 3, 5 NC No internal connection. Pins 3 and 5 should be connected to the GND pin. 4 SREF 6 PGOOD Power-good open-drain indicator output. This pin changes to high impedance when the converter is able to supply regulated voltage. The pull-down resistance between the PGOOD pin and the GND pin identifies which protective fault has shut down the regulator. See Table 1 on page 10. 7 FB Voltage feedback sense input. Connects internally to the inverting input of the control-loop error amplifier. The converter is in regulation when the voltage at the FB pin equals the voltage on the SREF pin. The control loop compensation network connects between the FB pin and the converter output. See Figure 8 on page 11. 8 VO Output voltage sense input for the R3 modulator. The VO pin also serves as the reference input for the overcurrent detection circuit. See Figure 5 on page 7. 9 OCSET Input for the overcurrent detection circuit. The overcurrent setpoint programming resistor ROCSET connects from this pin to the sense node. See “OVERCURRENT PROGRAMMING CIRCUIT” on page 7. 10 PHASE Return current path for the UGATE high-side MOSFET driver. VIN sense input for the R3 modulator. Inductor current polarity detector input. Connect to junction of output inductor, high-side MOSFET, and low-side MOSFET. See “Application Schematics” on page 4 (Figures 2 and 3). 11 UGATE High-side MOSFET gate driver output. Connect to the gate terminal of the high-side MOSFET of the converter. 12 BOOT Positive input supply for the UGATE high-side MOSFET gate driver. The BOOT pin is internally connected to the cathode of the Schottky boot-strap diode. Connect an MLCC between the BOOT pin and the PHASE pin. 13 VCC Input for the IC bias voltage. Connect +5V to the VCC pin and decouple with at least a 1µF MLCC to the GND pin. See “Application Schematics” on page 4 (Figures 2 and 3). 14 PVCC Input for the LGATE and UGATE MOSFET driver circuits. The PVCC pin is internally connected to the anode of the Schottky boot-strap diode. Connect +5V to the PVCC pin and decouple with a 10µF MLCC to the PGND pin. See “Application Schematics” on page 4 (Figures 2 and 3). 15 LGATE Low-side MOSFET gate driver output. Connect to the gate terminal of the low-side MOSFET of the converter. 16 PGND Return current path for the LGATE MOSFET driver. Connect to the source of the low-side MOSFET. IC ground for bias supply and signal reference. Soft-start programming capacitor input. Connects internally to the inverting input of the VSET voltage setpoint amplifier. Ordering Information PART NUMBER (Notes 1, 2, 3) ISL78210ARUZ-T PART MARKING GAT TEMP RANGE (°C) -40 to +105 PACKAGE Tape & Reel (Pb-Free) 16 Ld 2.6x1.8 µTQFN PKG. DWG. # L16.2.6x1.8A 1. Please refer to TB347 for details on reel specifications. 2. 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. 3. For Moisture Sensitivity Level (MSL), please see device information page for ISL78210. For more information on MSL please see techbrief TB363. FN7583 Rev 1.00 December 4, 2013 Page 2 of 17 EN ISL78210 FN7583 Rev 1.00 December 4, 2013 Block Diagram VCC 100k POR FB  EA  VCOMP PWM FAULT 100pF VW BOOT RUN RUN H L IN DRIVER UGATE PHASE SHOOT-THROUGH PROTECTION OTP PVCC PWM RUN DRIVER LGATE PGND  VCC VSET gmVIN    Cr VR  SREF gmVO  OVP   OCP  FB VREF GND  UVP   FAULT 500mV Page 3 of 17 FIGURE 1. SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM OF ISL78210 VO OCSET IOCSET 10µF PGOOD ISL78210 Application Schematics RVCC +5V VCC 4 9 QLS OCSET CBOOT COC COB COCSET VO FB NC VOUT 0.5V TO 3.3V LO PHASE 8 10 7 3 UGATE ROCSET 11 QHS BOOT RO RCOMP CSOFT CINB 13 PVCC 14 2 5 SREF CINC 12 6 NC 15 16 EN GPIO VIN 3.3V TO 25V 1 PGOOD GND LGATE CVCC PGND CPVCC CCOMP ROFS RPGOOD VCC RFB GPIO FIGURE 2. ISL78210 APPLICATION SCHEMATIC WITH DCR CURRENT SENSE RVCC +5V VCC 4 9 LO PHASE RSNS QLS OCSET CBOOT VO FB NC 8 10 7 3 UGATE ROCSET 11 QHS BOOT VOUT 0.5V TO 3.3V COC COB COCSET RO RCOMP CSOFT CINB 13 PVCC 14 2 5 SREF CINC 12 6 NC 15 16 EN GPIO VIN 3.3V TO 25V 1 PGOOD GND LGATE CVCC PGND CPVCC CCOMP ROFS RPGOOD VCC RFB GPIO FIGURE 3. ISL78210 APPLICATION SCHEMATIC WITH RESISTOR CURRENT SENSE FN7583 Rev 1.00 December 4, 2013 Page 4 of 17 ISL78210 Absolute Maximum Ratings Thermal Information VCC, PVCC, PGOOD to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +7.0V VCC, PVCC to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +7.0V GND to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +0.3V EN, VO, FB, OCSET, SREF . . . . . . . . . . . . . . . . . . . . -0.3V to GND, VCC +0.3V BOOT Voltage (VBOOT-GND) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 33V BOOT To PHASE Voltage (VBOOT-PHASE). . . . . . . . . . . . . . . . -0.3V to 7V (DC) -0.3V to 9V (