MAX8760 19-3721 Rev 0 5/05 Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies General Description Features The MAX8760 is a dual-phase, Quick-PWM, step- Dual-Phase, Quick-PWM Controller down controller for 6-bit VID AMD Mobile Turion 64 0.75% V Accuracy Over Line, Load, and OUT CPU core supplies. Dual-phase operation reduces input Temperature (1.3V) ripple current requirements and output voltage ripple Active Voltage Positioning with Adjustable Gain while easing component selection and layout difficulties. and Offset The Quick-PWM control scheme provides instantaneous response to fast-load current steps. The MAX8760 6-Bit On-Board DAC: 0.375V to 1.55V Output includes active voltage positioning with adjustable gain Adjust Range and offset, reducing power dissipation and bulk output Selectable 100kHz/200kHz/300kHz/550kHz capacitance requirements. Switching Frequency The MAX8760 is intended for two different notebook CPU 4V to 28V Battery Input Voltage Range core applications: stepping down the battery directly or Adjustable Slew-Rate Control stepping down the 5V system supply to create the core voltage. The single-stage conversion method allows this Drives Large Synchronous Rectifier MOSFETs device to directly step down high-voltage batteries for the Undervoltage and Thermal-Fault Protection highest possible efficiency. Alternatively, two-stage con- version (stepping down the 5V system supply instead of Power Sequencing and Timing the battery) at a higher switching frequency provides the Selectable Suspend Voltage minimum possible physical size. Soft-Start and Soft-Shutdown The MAX8760 complies with AMDs desktop and mobile Selectable Single- or Dual-Phase Pulse Skipping CPU specifications. The switching regulator features soft- start and power-up sequencing, and soft-shutdown. The MAX8760 also features independent four-level logic inputs Ordering Information for setting the suspend voltage (S0, S1). PART TEMP RANGE PIN-PACKAGE The MAX8760 includes output undervoltage protection, MAX8760ETL -40C to +100C 40 Thin QFN 6mm x 6mm thermal protection, and voltage regulator power-OK (VROK) output. When any of these protection features MAX8760ETL+ -40C to +100C 40 Thin QFN 6mm x 6mm detect a fault, the controller shuts down. +Denotes lead-free package. The MAX8760 is available in a low-profile, 40-pin 6mm x 6mm thin QFN package. For other CPU platforms, refer to Pin Configuration the pin-to-pin compatible MAX1544, MAX1519/MAX1545, TOP VIEW and MAX1532/MAX1546/MAX1547 data sheets. 30 29 28 27 26 25 24 23 22 21 Applications PGND 31 20 D4 6-Bit VID AMD Mobile Turion 64 CPU DLS 32 19 D5 Multiphase CPU Core Supply 18 DHS 33 SKIP 34 17 LXS OAIN+ Voltage-Positioned Step-Down Converters BSTS 35 16 OAIN- Servers/Desktop Computers MAX8760 V+ 36 15 FB CMP 37 14 CCI 13 GNDS CMN 38 39 12 CSN CCV 40 11 GND CSP 12 3 4 5 6 78 9 10 Quick-PWM is a trademark of Maxim Integrated Products, Inc. THIN QFN Turion is a trademark of AMD. 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 AVAILABLE TIME V DD TON DLM DHM SUS S0 LXM S1 BSTM SHDN VROK OFS D0 D1 REF ILIM D2 V D3 CCDual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies ABSOLUTE MAXIMUM RATINGS V+ to GND..............................................................-0.3V to +30V LXM to BSTM............................................................-6V to +0.3V V to GND..............................................................-0.3V to +6V DHS to LXS..............................................-0.3V to (V + 0.3V) CC BSTS V to PGND............................................................-0.3V to +6V LXS to BSTS .............................................................-6V to +0.3V DD SKIP, SUS, D0D5 to GND.......................................-0.3V to +6V GND to PGND .......................................................-0.3V to +0.3V ILIM, FB, OFS, CCV, CCI, REF, OAIN+, REF Short-Circuit Duration .........................................Continuous OAIN- to GND.........................................-0.3V to (V + 0.3V) Continuous Power Dissipation (T = +70C) CC A CMP, CSP, CMN, CSN, GNDS to GND......-0.3V to (V + 0.3V) 40-Pin 6mm 6mm Thin QFN CC TON, TIME, VROK, S0S1 to GND..............-0.3V to (V + 0.3V) (derate 23.2mW/C above +70C)...............................1.860W CC SHDN to GND (Note 1)...........................................-0.3V to +18V Operating Temperature Range .........................-40C to +100C DLM, DLS to PGND....................................-0.3V to (V + 0.3V) Junction Temperature......................................................+150C DD BSTM, BSTS to GND ..............................................-0.3V to +36V Storage Temperature Range .............................-65C to +150C DHM to LXM ...........................................-0.3V to (V + 0.3V) Lead Temperature (soldering, 10s) .................................+300C BSTM 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 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+ = 15V, V = V = V = V = V = V = 5V, V = V = V = V = V = 1.3V, OFS = CC DD SHDN SKIP S0 S1 FB CMP CMN CSP CSN SUS = GNDS = D0D5 = GND, T = 0C to +85C, unless otherwise specified. Typical values are at T = +25C.) A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS PWM CONTROLLER Battery voltage, V+ 4 28 Input Voltage Range V V , V 4.5 5.5 CC DD DAC codes 1V -10 +10 V+ = 4.5V to 28V, DC Output Voltage Accuracy includes load mV DAC codes from (Note 2) -15 +15 regulation error 0.375V to 1V Line Regulation Error V = 4.5V to 5.5V, V+ = 4.5V to 28V 5 mV CC I , I FB, GNDS -2 +2 FB GNDS Input Bias Current A I OFS -0.1 +0.1 OFS OFS Input Range 02V V /V OUT OFS -0.129 -0.125 -0.117 V = V V = 0 to 1V OFS OFS, OFS OFS Gain A V/V OFS V /V OUT OFS -0.129 -0.125 -0.117 V = V - V V = 1V to 2V OFS OFS REF, OFS GNDS Input Range -20 +200 mV GNDS Gain A V /V 0.97 0.99 1.01 V/V GNDS OUT GNDS 1000kHz nominal, R = 15k 900 1000 1100 TIME 500kHz nominal, R = 30k 460 500 540 TIME TIME Frequency Accuracy f kHz TIME 250kHz nominal, R = 60k 225 250 275 TIME Startup and shutdown, R = 30k 125 TIME 2 MAX8760