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MAX8770 Dataheets PDF



Part Number MAX8770
Manufacturers Maxim Integrated Products
Logo Maxim Integrated Products
Description (MAX8770 - MAX8772) PWM Controller
Datasheet MAX8770 DatasheetMAX8770 Datasheet (PDF)

CONFIDENTIAL INFORMATION – RESTRICTED TO INTEL® IMVP-6 LICENSEES 19-3913; Rev 0; 10/05 MAX8770/MAX8771/MAX8772 Dual-Phase, QuickPWM Controller for IMVP-6+ CPU Core Power Supplies General Description The MAX8770/MAX8771/MAX8772 are 2/1-phase interleaved Quick-PWM™ step-down VID power-supply controllers for notebook CPUs. True out-of-phase operation reduces input ripple current requirements and output voltage ripple while easing component selection and layout difficulties. The Quick-PWM control p.

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CONFIDENTIAL INFORMATION – RESTRICTED TO INTEL® IMVP-6 LICENSEES 19-3913; Rev 0; 10/05 MAX8770/MAX8771/MAX8772 Dual-Phase, QuickPWM Controller for IMVP-6+ CPU Core Power Supplies General Description The MAX8770/MAX8771/MAX8772 are 2/1-phase interleaved Quick-PWM™ step-down VID power-supply controllers for notebook CPUs. True out-of-phase operation reduces input ripple current requirements and output voltage ripple while easing component selection and layout difficulties. The Quick-PWM control provides instantaneous response to fast load current steps. Active voltage positioning reduces power dissipation and bulk output capacitance requirements and allows ideal positioning www.DataSheet4U.com compensation for tantalum, polymer, or ceramic bulk output capacitors. The MAX8770/MAX8771/MAX8772 are intended for two different notebook CPU core applications: either bucking down the battery directly to create the core voltage, or else bucking down the +5V system supply. The singlestage conversion method allows this device to directly step down high-voltage batteries for the highest possible efficiency. Alternatively, 2-stage conversion (stepping down the +5V system supply instead of the battery) at higher switching frequency provides the minimum possible physical size. A slew-rate controller allows controlled transitions between VID codes, controlled soft-start and shutdown, and controlled exit from suspend. A thermistor-based temperature sensor provides a programmable thermalfault output (VRHOT). A power-monitor output (POUT) provides an analog voltage output proportional to the power consumed by the CPU. The MAX8770/MAX8771/ MAX8772 include output undervoltage protection (UVP) and thermal protection, and the MAX8770/MAX8771 also include overvoltage protection (OVP). When any of these protection features detect a fault, the controller shuts down. A voltage-regulator power-OK (PWRGD) output indicates the output is in regulation. A clock enable (CLKEN) output provides proper system startup sequencing. Additionally, the MAX8771 has a phase-good (PHASEGD) output, and the MAX8770/MAX8772 includes true differential current sense. The MAX8770/MAX8771/MAX8772 implement the Intel IMVP-6+ code set and the required IMVP-6+ control signals. The MAX8770/MAX8771/MAX8772 are available in a 40-pin TQFN package. Features ♦ Single/Dual-Phase, Quick-PWM Controller ♦ ±0.4% VOUT Accuracy Over Line, Load, and Temperature ♦ 7-Bit On-Board DAC: 0 to +1.5000V Output Adjust Range ♦ Dynamic Phase Selection Optimizes Active/Sleep Efficiency ♦ Transient Phase Overlap Reduces Output Capacitance ♦ Integrated Boost Switches ♦ Active Voltage Positioning with Adjustable Gain ♦ Programmable 200kHz to 600kHz Switching Frequency ♦ Accurate Current Balance and Current Limit ♦ Adjustable Slew-Rate Control ♦ Power-Good (PWRGD), Clock Enable (CLKEN), Power Monitor (POUT) and Thermal Fault (VRHOT) Outputs ♦ Phase Fault (PHASEGD) Output (MAX8771) ♦ Drives Large Synchronous Rectifier MOSFETs ♦ 4V to 26V Battery-Input-Voltage Range ♦ Output OV Protection (MAX8770/MAX8771) ♦ UV and Thermal-Fault Protection ♦ Power Sequencing and Timing ♦ Soft-Startup and Soft-Shutdown MAX8770/MAX8771/MAX8772 Ordering Information PART TEMP PIN-PACKAGE MAX8770GTL+ -40°C to +105°C 40 Thin QFN 6mm x 6mm MAX8771GTL+ -40°C to +105°C 40 Thin QFN 6mm x 6mm MAX8772GTL+ -40°C to +105°C 40 Thin QFN 6mm x 6mm +Denotes lead-free package. Applications IMVP-6+ Core Supply Multiphase CPU Core Supply Voltage-Positioned, Step-Down Converters Notebook/Desktop Computers Blade Servers Intel is a registered trademark of Intel, Corp. Quick-PWM is a trademark of Maxim Integrated Products, Inc. ________________________________________________________________ Maxim Integrated Products 1 Pin Configuration appears at end of data sheet. For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. CONFIDENTIAL INFORMATION – RESTRICTED TO INTEL® IMVP-6 LICENSEES MAX8770/MAX8771/MAX8772 Dual-Phase, QuickPWM Controller for IMVP-6+ CPU Core Power Supplies MAX8770/MAX8771/MAX8772 ABSOLUTE MAXIMUM RATINGS BST_ to GND ..........................................................-0.3V to +36V LX_ to BST_ ..............................................................-6V to +0.3V BST_ to VDD...........................................................-0.3V to +30V DH_ to LX_ ..................................................-0.3V to VBST_ +0.3V REF Short Circuit to GND ...........................................Continuous Continuous Power Dissipation 40-Pin 6mm x 6mm Thin QFN (derate 23.2mW/°C above +70°C) .............................2051mW Operating Temperature Range .........................-40°C to +105°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +165°C Lead Temperature (soldering, 10s) .................................


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