MAX8811 19-3974 Rev 1 4/07 High-Speed, Dual-Phase Driver with Integrated Boost Diodes General Description Features The MAX8811 2-phase gate driver controls power Dual-Phase Synchronous Buck Driver MOSFETs in multiphase synchronous step-down con- Integrated Bootstrap Diodes verter applications, providing up to 30A output current per phase. The MAX8811 and MAX8810A (multiphase Up to 26V System Input Voltage power-supply controller) combine to provide an efficient, 6A Peak Gate Drive Current low-cost solution for a wide range of multiphase power- supply applications. The MAX8811 handles system input Capable of 30A per Phase voltages up to 26V. Each MOSFET driver is capable of 0.4/0.9 Low-Side, 0.7/1.0 High-Side driving 3000pF capacitive loads with 11ns typical rise and fall times. Drivers (typ) Adaptive shoot-through protection circuitry is imple- Typical 11ns Rise/Fall Times with 3000pF Load mented to prevent shoot-through currents for the high- Adaptive Dead-Time Control side off to low-side on transition. A programmable delay is provided for the low-side off to high-side on User-Programmable Delay Time transition. This maximizes overall converter efficiency Enable Function with 0.04A (typ) Quiescent while supporting operation with a variety of MOSFETs. Current in Shutdown The MAX8811 provides an easy upgrade path from the Space-Saving, Lead-Free, 16-Pin QSOP MAX8523 dual driver. Integrated bootstrap diodes reduce external component count, while an enable input provides flexibility for power sequencing. The MAX8811 is available in a space-saving, 16-pin QSOP. Ordering Information Applications PIN- PKG PART TEMP RANGE Processor Core Voltage Regulators PACKAGE CODE Multiphase Buck Converters MAX8811EEE+ -40C to +85C 16 QSOP E16-4 Voltage-Regulator Modules (VRMs) +Denotes a lead-free package. Switching Power Supplies DC-DC Converter Modules Pin Configuration Typical Operating Circuit POWER INPUT UP TO 26V GATE-DRIVE SUPPLY 4.5V TO 7V 4 VL1 TOP VIEW 13 2 VL2 DH1 1 + BST1 BST1 1 16 BST2 OUTPUT 3 LX1 DH1 2 15 DH2 + 5 DL1 LX1 14 LX2 3 6 8 VL1 4 MAX8811 13 VL2 DLY PGND1 DL1 5 12 DL2 MAX8811 PGND1 6 11 PGND2 15 DH2 ON 16 EN 7 10 PWM2 7 BST2 OFF EN DLY 8 9 PWM1 14 9 LX2 PWM1 12 QSOP 10 DL2 PWM2 11 PWM CONTROL PGND2 SIGNALS 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. EVALUATION KIT AVAILABLEHigh-Speed, Dual-Phase Driver with Integrated Boost Diodes ABSOLUTE MAXIMUM RATINGS DLY, EN, PWM , DL to PGND .................-0.3V to (V + 0.3V) VL to BST Internal Diode Current .........................50mA RMS VL BST to PGND ............................................-0.3V to (V + 8V) PGND1 to PGND2 .................................................-0.3V to +0.3V LX BST to VL ...............................................................-1V to +30V Continuous Power Dissipation (T = +70C) A LX to PGND ............................................................-1V to +28V 16-Pin QSOP (derate 8.3 mW/C above +70C)......666.7 mW DH to PGND .........................................-0.3V to (V + 0.3V) Operating Temperature Range ...........................-40C to +85C BST DH , BST to LX .....................................................-0.3V to +8V Junction Temperature......................................................+150C VL to PGND ..........................................................-0.3V to +8V Storage Temperature Range .............................-65C to +150C DH , DL Current ................................................. 200mA RMS Lead Temperature (soldering, 10s) .................................+300C 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 = 6.5V, V = V = V = 0V, T = -40C to +85C, unless otherwise noted. Typical values are PWM DLY EN BST VL PGND LX A at T = +25C.) (Note 1) A PARAMETER CONDITIONS MIN TYP MAX UNITS GENERAL VL Input Voltage Range 4.5 7 V LX Operating Range 26 V VL Undervoltage Lockout V rising, 250mV hysteresis (typ) 3.25 3.8 V VL (UVLO) V = 0V 0.7 1.5 Supply Current (per Channel) PWM mA I + I BST VL V = V = V 1.4 2 PWM DLY VL Shutdown Supply Current V = 0V, V = 0V or V 0.04 1 A EN PWM VL (per Channel) I + I BST VL PWM Input Leakage V = 0V or 7.0V, V = 0V or 7.0V 0.01 A PWM EN Input Voltage High Threshold 3.5 V Input Voltage Low Threshold 1.2 V Input Threshold Hysteresis 20 % EN Input Leakage V = 0V or 7.0V, V = 0V or 7.0V 0.01 A PWM EN Input Voltage High Threshold 2.6 V Input Voltage Low Threshold 0.8 V Input Voltage Hysteresis 0.5 V DLY Delay Disable Threshold 0.8 1.2 V V - V VL DLY 2 MAX8811