MAX8523 4 . 9 P m O m S 19-2860 Rev 0 4/03 High-Speed, Dual-Phase Gate Driver for Multiphase, Step-Down Converters General Description Features The MAX8523 dual-phase gate driver, along with the 6A Peak Gate-Drive Current MAX8524*/MAX8525 multiphase controllers, provides Up to 1.2MHz Operation flexible 2- to 8-phase CPU core-voltage supplies. The 0.5 /0.95 driver resistance allows up to 30A output Up to 6.5V Gate-Drive Voltage current per phase. 0.5 /0.95 Low-Side Drivers Each MOSFET driver in the MAX8523 is capable of dri- Capable of 30A Output per Phase ving 3000pF capacitive loads with only 15ns propaga- tion delay and 11ns typical rise and fall times, allowing Adaptive Shoot-Through Protection operations up to 1.2MHz per phase. Adaptive dead time controls low-side MOSFET turn-on, and user-pro- User-Programmable Delay Time grammable dead time controls high-side MOSFET turn- TTL and CMOS Input Compatible on. This maximizes converter efficiency while allowing operation with a variety of MOSFETs and controller ICs. UVLO for Proper Sequencing An undervoltage lockout (UVLO) circuit allows proper Flexible 2- to 8-Phase Implementation with power-on sequencing. PWM signal inputs are both MAX8524 and MAX8525 TTL and CMOS compatible. Space-Saving (4.9mm 6mm) 16-Pin QSOP The MAX8523 is available in a space-saving 16-pin QSOP package, and specified for -40C to +85C operation. Package Applications Ordering Information Core Voltage Supplies for Pentium IV Microprocessors PART TEMP RANGE PIN-PACKAGE Servers and Workstations MAX8523EEE -40C to +85C 16 QSOP Desktop Computers Voltage Regulator Modules (VRMs) *Future product. Contact factory for availability. DC-to-DC Regulator Modules Switches, Routers, and Storage Typical Operating Circuit 3V TO 13.2V +4.5V TO +6.5V GATE DRIVE SUPPLY 1 7 BST1 V CC 16 2 DH1 BST2 PHASE 1 OUTPUT 3 15 LX1 DH2 PHASE 2 OUTPUT MAX8523 5 14 DL1 LX2 6 12 PGND1 DL2 4 11 PV1 PGND2 13 10 PV2 PWM2 8 9 DLY PWM1 PHASE 2 PWM INPUT PHASE 1 PWM INPUT Pentium is a trademark of Intel Corp. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. Q x - 6 6 m 1 mHigh-Speed, Dual-Phase Gate Driver for Multiphase, Step-Down Converters ABSOLUTE MAXIMUM RATINGS BST to PGND ......................................................-0.3V to +26V PWM to PGND1 ........................................-0.3V to (PV2 + 0.3V) LX to PGND ............................................................-1V to +14V V to PV1 ..............................................................-7V to +0.3V CC DH to PGND ..........................................-0.3V to (BST + 0.3V) DH , DL Continuous Current .......................................200mA DH to LX ................................................................-0.3V to +7V Continuous Power Dissipation (T = +70C) A BST to LX ..............................................................-0.3V to +7V 16-Pin QSOP (derate 8.3mW/C above +70C).............667mW DL to PGND .............................................-0.3V to (PV + 0.3V) Operating Temperature Range ...........................-40C to +85C PV to PGND ..........................................................-0.3V to +7V Junction Temperature......................................................+150C PGND2 to PGND1 .................................................-0.3V to +0.3V Storage Temperature Range .............................-65C to +150C V to PGND1..........................................................-0.3V to +7V Lead Temperature (soldering, 10s) .................................+300C CC DLY to PGND1............................................-0.3V to (V + 0.3V) CC Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V = V = V = V = V = V = 5V, V = V = V = V = 0V T = 0C to +85C, unless otherwise VCC PV1 PV2 BST1 BST2 DLY PGND1 PGND2 LX1 LX2 A noted. Typical values are at T = +25C.) A PARAMETER CONDITIONS MIN TYP MAX UNITS UNDERVOLTAGE PROTECTION Supply Voltage Range 4.5 6.5 V V rising 3.25 3.5 3.8 CC UVLO V V falling 3.0 3.5 CC DLY = V 50 100 A CC I VCC Dynamic, R = 50k 0.5 1 mA DLY PWM = GND 1 10 A I PV PWM = V 1.2 2 mA CC PWM = GND 0.1 10 A I BST PWM = V 1.2 2 mA CC I + I + I + I 250kHz 4 8 mA BST1 PV1 BST2 PV2 DRIVER SPECIFICATIONS PWM = PGND1, V = 4.5V 0.65 1.2 BST DH Driver Resistance PWM = V , V = 4.5V 0.8 1.35 CC BST PWM = PGND1, V = 4.5V 0.95 1.6 PV DL Driver Resistance PWM = V , V = 4.5V 0.5 0.9 CC PV DH Rise Time PWM = V , V = 5V, 3nF load 11 ns CC BST DH Fall Time PWM = PGND1, V = 5V, 3nF load 9.5 ns BST DL Rise Time PWM = V , V = 5V, 3nF load 8.5 ns CC PV DL Fall Time PWM = PGND1, V = 5V, 3nF load 6.5 ns PV DH Propagation Delay PWM falling, V = 5V 15 ns BST DL Propagation Delay PWM rising, V = 5V 8 ns BST PWM INPUT Input Current V = 0V or 6.5V 0.01 1 A PWM Input Voltage High 2.5 V Input Voltage Low 0.8 V 2 MAX8523