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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 the RT9237/RT9241 series of 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 with 12V. Independent driving of upper gate through PVCC pin is achievable. This drive-voltage flexibility provides the advantage of optimizing applications involving tradeoffs between switching losses and conduction losses. The output drivers in the RT9600 can efficiently switch power MOSFETs at frequency up to 500KHz. Switching frequency above 500KHz has to take into account the thermal dissipation of SOP-8 package. RT9600 is capable of driving a 3000pF load with a 30ns rise time. RT9600 implements bootstrapping on the upper gate with only an external capacitor required. This reduces implementation complexity and allows the use of higher performance, cost effective, N-Channel MOSFETs. Adaptive shootthrough protection is integrated to prevent both MOSFETs from conducting simultaneously.
Features
Drives Two N-Channel MOSFETs Adaptive Shoot-Through Protection Internal Bootstrap Device Supports High Switching Frequency - Fast Output Rise Time Small SOP-8 Package Dual Gate-Drive Voltages for Optimal Efficiency Tri-State Input for Bridge Shutdown Supply Under Voltage Protection
Applications
Core Voltage Supplies for Intel Pentium 4, AMD TM Athlon 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 7 6 5
PHASE PVCC VCC LGATE
Ordering Information
RT9600 Package type S : SOP-8 Operating temperature range C: Commercial standard
DS9600-00 August, 2002
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RT9600
Pin Description
Pin No. Pin Name 1 2 3 4 5 6 7 8 UGATE BOOT PWM GND LGATE VCC PVCC PHASE
Preliminary
Pin Function 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 UGATE PHASE
Internal 5V 500K PWM 500K
LGATE
GND
Typical Application Circuit
+12V
10 +12V 6 VCC 7 PVCC C13 1F 3 2 BOOT 1 UGATE PHASE 8
C8 1F C11 1F
C9 1000F/16V
Q3 PHB83N03LT L3 2H VCORE C15 x1500F C16 x1500F ISEN2 R13 2.4K ISN2 There 2 PCB trace have to parallel and place R near to PWM IC
RT9600
PWM GND 4 LGATE
PWM
5 Q4 PHB95N03LT R10 2.4K
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Preliminary Absolute Maximum Ratings
Supply Voltage (VCC) Supply Voltage (PVCC) BOOT Voltage (Vboot-Vphase) PWM Input Voltage UGATE LGATE Power Dissipation, PD @ TA = 25C SOP-8 Package Thermal Resistance SOP-8, JA Ambient Temperature Range Junction Temperature Storage Temperature Range Lead Temperature (Soldering, 10 sec.) EDS Level HBM MM
RT9600
15V VCC + 0.3V 15V GND - 0.3V to 7V VPHASE - 0.3V to VBOOT + 0.3V GND - 0.3V To VPVCC + 0.3V 0.625W 160C /W 0C ~ 70C 0C ~ 125C -40C ~ 150C 260C 2KV 200V
Electrical Characteristics
Parameter VCC Supply Current Bias Supply Current Power Supply Current Power-On Reset VCC Rising Threshold VCC Falling Threshold Output Upper Drive Source Upper Drive Sink Lower Drive Source Lower Drive Sink PWM Input Maximum Input Current PWM Floating Voltage PWM Rising Threshold PWM Falling Threshold UGATE Rise Time VPVCC = VVCC = 12V, 3nF load VPWM = 0 or 5V VCC = 12V -----60 1.9 3.7 1.1 30 -----A V V V ns RUGATE RUGATE RLGATE RLGATE VVCC = 12V, VPVCC = 12V VVCC = 12V, VPVCC = 12V VVCC = 12V, VPVCC = 12V VVCC = VPVCC = 12V ----1.5 1.45 1.6 0.75 -2 -1 9.1 7.5 9.6 8.1 10 8.5 V V IVCC IPVCC fPWM = 250KHz, VPVCC = 12V, Cboot = 0.1F, Rphase = 20 fPWM = 500kHz, VPVCC = 12V, Cboot = 0.1F, Rphase = 20 --5.2 3.7 6 5 mA mA Symbol Test Conditions Min Typ Max Units
To be continued
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RT9600
Parameter LGATE Rise Time UGATE Fall Time LGATE Fall Time UGATE Turn-Off Propagation Delay LGATE Turn-Off Propagation Delay Shutdown Window Symbol
Preliminary
Test Conditions 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 Min -----1.1 Typ 30 40 30 60 45 -Max -----3.7 Units ns ns ns ns ns V
Operation Descriptions
The RT9600 is designed to drive both high side and low side N-channel MOSFET through externally input PWM control signal. It has power on protection function which held UGATE and LGATE low before VCC up across the rising threshold voltage. After the initialization, the PWM signal takes the control. The rising PWM signal first forces the LGATE signal turns low then UGATE signal is allowed to go high just after a non-overlapping time to avoid shoot-through current. The falling of PWM signal first forces UGATE to go low. When UGATE and PHASE signal reach a predetermined low level, LGATE signal is allowed to turn high. The non-overlapping function is also presented between UG and LG signal transient. The PWM signal is recognized as high if above rising threshold and as low if below falling threshold. Any signal level in this window is considered as tri-state, which causes turn-off of both high side and low-side MOSFET. When PWM input is floating (not connected), internal divider will pull the PWM to 1.9V to give the controller a recognizable level. The maximum sink/source capability of internal PWM reference is 60A. The PVCC pin provides flexibility of high side MOSFET gate drive voltage. If 8V, for example, is applied to PVCC, then high side MOSFET gate drive is 8V-1.5V(approximately, internal diode plus series resistance voltage drop). The RT9600 typically operates at frequency of 200~250KHz. A 1N4148 diode connecting PVCC and BOOT is recommended for higher operating frequency.
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Testing Conditions
The CU and CL capacitors in the test circuit are high side and low side low capacitors. The 20 resistor between PHASE and ground is implemented as the load of the buck converter. For output resistance, typical voltage/current measurements are made to calculate the RDS(ON). It should be noted that source of both high side and low side drivers are both current controlled current sources, the output resistance is acquired by interpolation.
+12V +12V +12V BOOT PVCC UGATE 0.1F 0.1F
2N7002 CU 3nF
RT9600
VCC 0.1F PWM PWM LGATE GND PHASE
20 2N7002 CL 3nF
Testing Circuit
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Preliminary Package Information
H A M
RT9600
JB
F
C
D
I
Dimensions In Millimeters Symbol A B C D F H I J M 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 August, 2002
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RT9600
Preliminary
RICHTEK TECHNOLOGY CORP.
Headquarter
5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611
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.com
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