MAX8770/MAX8771/MAX8772 CONFIDENTIAL INFORMATION RESTRICTED TO INTEL IMVP-6 LICENSEES 19-3913 Rev 0 10/05 MAX8770/MAX8771/MAX8772 Dual-Phase, Quick- PWM Controller for IMVP-6+ CPU Core Power Supplies General Description Features The MAX8770/MAX8771/MAX8772 are 2/1-phase inter- Single/Dual-Phase, Quick-PWM Controller leaved Quick-PWM step-down VID power-supply con- 0.4% V Accuracy Over Line, Load, and OUT trollers for notebook CPUs. True out-of-phase operation Temperature reduces input ripple current requirements and output volt- age ripple while easing component selection and layout 7-Bit On-Board DAC: 0 to +1.5000V Output Adjust difficulties. The Quick-PWM control provides instanta- Range neous response to fast load current steps. Active voltage Dynamic Phase Selection Optimizes Active/Sleep positioning reduces power dissipation and bulk output Efficiency capacitance requirements and allows ideal positioning compensation for tantalum, polymer, or ceramic bulk out- Transient Phase Overlap Reduces Output put capacitors. Capacitance The MAX8770/MAX8771/MAX8772 are intended for two Integrated Boost Switches different notebook CPU core applications: either bucking Active Voltage Positioning with Adjustable Gain down the battery directly to create the core voltage, or else bucking down the +5V system supply. The single- Programmable 200kHz to 600kHz Switching stage conversion method allows this device to directly Frequency step down high-voltage batteries for the highest possible Accurate Current Balance and Current Limit efficiency. Alternatively, 2-stage conversion (stepping Adjustable Slew-Rate Control down the +5V system supply instead of the battery) at higher switching frequency provides the minimum possi- Power-Good (PWRGD), Clock Enable (CLKEN), ble physical size. Power Monitor (POUT) and Thermal Fault A slew-rate controller allows controlled transitions (VRHOT) Outputs between VID codes, controlled soft-start and shutdown, Phase Fault (PHASEGD) Output (MAX8771) and controlled exit from suspend. A thermistor-based temperature sensor provides a programmable thermal- Drives Large Synchronous Rectifier MOSFETs fault output (VRHOT). A power-monitor output (POUT) 4V to 26V Battery-Input-Voltage Range provides an analog voltage output proportional to the Output OV Protection (MAX8770/MAX8771) power consumed by the CPU. The MAX8770/MAX8771/ MAX8772 include output undervoltage protection (UVP) UV and Thermal-Fault Protection and thermal protection, and the MAX8770/MAX8771 also Power Sequencing and Timing include overvoltage protection (OVP). When any of these protection features detect a fault, the controller shuts Soft-Startup and Soft-Shutdown down. A voltage-regulator power-OK (PWRGD) output indicates the output is in regulation. A clock enable Ordering Information (CLKEN) output provides proper system startup sequenc- ing. Additionally, the MAX8771 has a phase-good PART TEMP PIN-PACKAGE (PHASEGD) output, and the MAX8770/MAX8772 includes MAX8770GTL+ -40C to +105C 40 Thin QFN 6mm x 6mm true differential current sense. MAX8771GTL+ -40C to +105C 40 Thin QFN 6mm x 6mm The MAX8770/MAX8771/MAX8772 implement the Intel MAX8772GTL+ -40C to +105C 40 Thin QFN 6mm x 6mm IMVP-6+ code set and the required IMVP-6+ control sig- +Denotes lead-free package. nals. The MAX8770/MAX8771/MAX8772 are available in a 40-pin TQFN package. Applications IMVP-6+ Core Supply Pin Configuration appears at end of data sheet. 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 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. CONFIDENTIAL INFORMATION RESTRICTED TO INTEL IMVP-6 LICENSEES MAX8770/MAX8771/MAX8772 Dual-Phase, Quick- PWM Controller for IMVP-6+ CPU Core Power Supplies ABSOLUTE MAXIMUM RATINGS V , V to GND .....................................................-0.3V to +6V BST to GND ..........................................................-0.3V to +36V CC DD D0D6, CSP to GND...............................................-0.3V to +6V LX to BST ..............................................................-6V to +0.3V CSN12 (MAX8771) to GND ......................................-0.3V to +6V BST to VDD...........................................................-0.3V to +30V CSN (MAX8770/MAX8772) to GND........................-0.3V to +6V DH to LX ..................................................-0.3V to V +0.3V BST PHASEGD (MAX8771) to GND.................................-0.3V to +6V REF Short Circuit to GND...........................................Continuous THRM, VRHOT, CLKEN to GND...............................-0.3V to +6V Continuous Power Dissipation TIME, PWRGD, POUT to GND......................-0.3V to V + 0.3V 40-Pin 6mm x 6mm Thin QFN CC REF, FB, CCV, CCI to GND ..........................-0.3V to V + 0.3V (derate 23.2mW/C above +70C).............................2051mW CC SHDN to GND (Note 1)...........................................-0.3V to +14V Operating Temperature Range .........................-40C to +105C TON to GND ...........................................................-0.3V to +30V Junction Temperature......................................................+150C DPRSLPVR, DPRSTP, PSI to GND ...........................-0.3V to +6V Storage Temperature Range .............................-65C to +165C GNDS, PGND to GND .........................................-0.3V to +0.3V Lead Temperature (soldering, 10s) .................................+300C DL to PGND ...............................................-0.3V to V + 0.3V DD Note 1: SHDN may be forced to 12V for the purpose of debugging prototype boards using the no-fault test mode, which disables fault protection and disables overlapping operation. 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 (Circuit of Figure 1. V = V = V = V = V = 5V, DPRSLPVR = GNDS = PGND = GND, V = V = V = V DD CC SHDN PSI DPRSTP FB CCI CSP CSN = 1.200V, D0D6 set for 1.20V (D0D6 = 0001100). T = 0C to +85C, unless otherwise specified. Typical values are at T = +25C.) A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS PWM CONTROLLER Input Voltage Range V , V 4.5 5.5 V CC DD DAC codes from -0.4 +0.4 % 0.8375V to 1.500V Includes load- DAC codes from DC Output-Voltage Accuracy V regulation error -4 +4 OUT 0.500V to 0.825V (Note 2) mV DAC codes below -10 +10 0.4875V Boot Voltage V 1.19 1.20 1.21 V BOOT GNDS Input Range V -200 +200 mV GNDS GNDS Gain A V / V , -200mV V +200mV 0.95 1.00 1.05 V/V GNDS OUT GNDS GNDS GNDS Input Bias Current I -25 -15 +2 A GNDS FB Input Bias Current I CSP = CSN for both enabled phases -2 +2 A FB R = 96.75k 142 167 192 TON V = 12V IN On-Time Accuracy (Note 3) t R = 200k 300 333 366 ns ON TON V = V = 1.2V FB CCI R = 303.25k 425 500 575 TON TON Shutdown Input Current SHDN = 0, V = 26V, V = V = 0 or 5V 0.01 0.1 A IN CC DD Minimum FB and CCI Voltages Switching frequency is reduced if FB and/or for Pseudo-Fixed-Frequency 0.2 0.25 V CCI are less than this value Operation Minimum Off-Time t (Note 3) 300 375 ns OFF(MIN) 2 MAX8770/MAX8771/MAX8772