RT9600CS

Preliminary RT9600 Synchronous-Rectified Buck MOSFET Drivers General Description The RT9600 is a high frequency, dual MOSFET driver specifically designed to drive two power NChannel MOSFETs in a synchronous-rectified buck converter topology. This driver combined with a RT9237 Multi-Phase Buck PWM controller form a complete core-voltage regulator solution for advanced microprocessors. The RT9600 drives both the lower/upper gate in a synchronous-rectifier bridge to 12V. Independent driving of upper gate through PVCC pin is achievable. Recommended PVCC ranges are from 8 to 12V for Rds(on) concern. This drive-voltage flexibility provides the advantage of optimizing applications involving trade-offs between switching losses and conduction losses. The output drivers in the RT9600 have the capacity to efficiently switch power MOSFETs at frequencies up to 2MHz. Each driver is capable of driving a 3000pF load with a 30ns propagation delay and 50ns external higher transition capacitor time. RT9600 This implements reduces N-Channel from bootstrapping on the upper gate with only an required. implementation complexity and allows the use of performance, cost effective, to prevent both MOSFETs. Adaptive shoot-through protection is integrated MOSFETs conducting simultaneously. Features Drives Two N-Channel MOSFETs Adaptive Shoot-Through Protection Internal Bootstrap Device Supports High Switching Frequency − Fast Output Rise Time − Propagation Delay 30ns Small SOP-8 Package Dual Gate-Drive Voltages for Optimal Efficiency Three-State Input for Bridge Shutdown Supply Under Voltage Protection High Side Short Circuit Protection Applications Core Voltage Supplies for Intel Pentium AMD Athlon  TM  4, Microprocessors High Frequency Low Profile DC-DC Converters High Current Low Voltage DC-DC Converters Pin Configurations Part Number RT9600CS (Plastic SOP-8) Pin Configurations TOP VIEW UGATE 1 BOOT 2 PWM 3 GND 4 8 PHASE 7 PVCC 6 VCC 5 LGATE Ordering Information RT9600 Package Type S : SOP-8 Operating temperature range C: Commercial standard DS9600-00 July 2001 www.richtek-ic.com.tw 1 RT9600 Pin Description Pin No. Pin Name 1 2 3 4 5 6 7 8 UGATE BOOT PWM GND LGATE VCC PVCC PHASE Pin Function Preliminary Upper Gate Drive Output. Connect to gate of high-side power N-Channel MOSFET Floating bootstrap supply pin for upper gate drive. Input PWM signal for controlling the driver. Ground Lower gate drive output. Connect to gate of low-side power N-Channel MOSFET. +12V Supply Voltage Upper Gate Drive Supply Bias. Typical +12V Connect this pin to the source of the high-side MOSFET and the drain of the low-side MOSFET Function Block Diagram PVCC BOOT VCC Control Logic Shootthrough Protect VCC High Side Short-CKT Protection LGATE UGATE Phase Internal 5V 500K PWM 500K GND Typical Application Circuit +12V C8 1µF +12V 6 VCC 7 PVCC C13 1µF 3 2 BOOT 1 UGATE PHASE 8 C11 1µF C9 100µF SANYO OS-CON 16V Q3 PHB83NO3LT L3 1µH VCORE C15 1000 µF C16 1000 µF ISEN2 ISN2 RT9600 PWM GND 4 LGATE PWM 5 Q4 PHB95NO3LT R10 2.4K R13 2.4K There 2 PCB trace have to parallel and place R near to PWM IC www.richtek-ic.com.tw DS9600-00 July 2001 2 Preliminary Absolute Maximum Ratings Supply Voltage (VCC) Supply Voltage (PVCC) BOOT Voltage Input Voltage UGATE LGATE EDS Level HBM MM Power Dissipation, PD @ TA = 25°C SOP-8 Package Thermal Resistance SOP-8, θJA Ambient Temperature Range Operating Junction Temperature Lead Temperature (Soldering, 10 sec.) Storage Temperature Range 160°C /W 0°C ~ 85°C 125°C 300°C -65°C ~ 150°C 0.625W 2KV 200V 12V VCC + 0.3V 12V RT9600 GND – 0.3V to 7V VPHASE – 0.3V to VBOOT + 0.3V GND – 0.3V To VPVCC + 0.3V Electrical Characteristics (VIN = 5V, CIN = COUT = 1µF, TA = 25°C, unless otherwise specified) Parameter VCC Supply Current Bias Supply Current Power Supply Current Power-On Reset VCC Rising Threshold VCC Falling Threshold Output VVCC = 12V, VPVCC = 8V, Instantaneous VVCC = VPVCC = 12V, Instantaneous VVCC = 12V, VPVCC = 8V VVCC = 12V, VPVCC = 12V VVCC = 12V, VPVCC = 12V, Instantaneous. ------1.7 3 4 2.6 3 1.3 -A -----Ω A Ω --9.2 8.1 --V V IVCC IPVCC fPWM = 1MHz, VPVCC = 12V fPWM = 1MHz, VPVCC = 12V, Cboot=0.1µF --3 1.5 --mA mA Symbol Test Conditions Min Typ Max Units Upper Drive Source IUGATE Upper Drive Sink Lower Drive Source Lower Drive Sink RUGATE ILGATE RLGATE VVCC = VPVCC = 12V To be continued DS9600-00 July 2001 www.richtek-ic.com.tw 3 RT9600 Parameter PWM Input Input Current PWM Rising Threshold PWM Falling Threshold UGATE Rise Time LGATE Rise Time UGATE Fall Time LGATE Fall Time UGATE Turn-Off Propagation Delay LGATE Turn-Off Propagation Delay Shutdown Window Shutdown Holdoff Time Symbol Preliminary Test Conditions Min ---VPVCC = VVCC = 12V, 3nF load VPVCC = VVCC = 12V, 3nF load VPVCC = VVCC = 12V, 3nF load VPVCC = VVCC = 12V, 3nF load VVCC = VPVCC = 12V, 3nF load VVCC = VPVCC = 12V, 3nF load ------1.5 -Typ 15 3.7 1.3 30 30 40 30 30 20 -230 Max ---------3.6 -Units µA V V ns ns ns ns ns ns V ns VPWM = 0 or 5V www.richtek-ic.com.tw DS9600-00 July 2001 4 Preliminary Package Information RT9600 H A M JB F C D I Symbol A B C D F H I J M Dimensions In Millimeters Min 4.801 3.810 1.346 0.330 1.194 0.178 0.102 5.791 0.406 Max 5.004 3.988 1.753 0.508 1.346 0.254 0.254 6.198 1.270 Dimensions In Inches Min 0.189 0.150 0.053 0.013 0.047 0.007 0.004 0.228 0.016 Max 0.197 0.157 0.069 0.020 0.053 0.010 0.010 0.244 0.050 8–Lead SOP Plastic Package DS9600-00 July 2001 www.richtek-ic.com.tw 5 RT9600 Preliminary RICHTEK TECHNOLOGY CORP. Headquarter 6F, No. 35, Hsintai Road, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5510047 Fax: (8863)5537749 RICHTEK TECHNOLOGY CORP. Taipei Office (Marketing) 8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek-ic.com.tw www.richtek-ic.com.tw DS9600-00 July 2001 6