MAX1544 19-2745 Rev 1 9/03 Dual-Phase, Quick-PWM Controller for AMD Hammer CPU Core Power Supplies General Description Features The MAX1544 is a dual-phase, Quick-PWM, step- Dual-Phase, Quick-PWM Controller down controller for AMD Hammer CPU core supplies. 0.75% V Accuracy Over Line, Load, and OUT Dual-phase operation reduces input ripple current Temperature (1.3V) requirements and output voltage ripple while easing Active Voltage Positioning with Adjustable Gain component selection and layout difficulties. The Quick- and Offset PWM control scheme provides instantaneous response to fast load-current steps. The MAX1544 includes active 5-Bit On-Board DAC: 0.675V to 1.55V Output voltage positioning with adjustable gain and offset, Adjust Range reducing power dissipation and bulk output capacitance Selectable 100kHz/200kHz/300kHz/550kHz requirements. Switching Frequency The MAX1544 is intended for two different notebook CPU 4V to 28V Battery Input Voltage Range core applications: stepping down the battery directly or stepping down the 5V system supply to create the core Adjustable Slew-Rate Control voltage. The single-stage conversion method allows this Drives Large Synchronous Rectifier MOSFETs device to directly step down high-voltage batteries for the Selectable Output Overvoltage Protection highest possible efficiency. Alternatively, two-stage con- version (stepping down the 5V system supply instead of Undervoltage and Thermal-Fault Protection the battery) at a higher switching frequency provides the Power Sequencing and Timing minimum possible physical size. Selectable Suspend Voltage The MAX1544 complies with AMDs desktop and Soft-Shutdown mobile CPU specifications. The switching regulator fea- tures soft-start and power-up sequencing, and Selectable Single- or Dual-Phase Pulse Skipping soft-shutdown. The MAX1544 also features indepen- dent four-level logic inputs for setting the suspend volt- Ordering Information age (S0S1). The MAX1544 includes output undervoltage protection, PART TEMP RANGE PIN-PACKAGE thermal protection, and voltage regulator power-OK MAX1544ETL -40C to +100C 40 Thin QFN 6mm 6mm (VROK) output. When any of these protection features detect a fault, the controller shuts down. Additionally, the MAX1544 includes selectable overvoltage protection. Pin Configuration The MAX1544 is available in a low-profile, 40-pin 6mm x 6mm thin QFN package. For other CPU platforms, TOP VIEW refer to the pin-to-pin compatible MAX1519/MAX1545 and MAX1532/MAX1546/MAX1547 data sheets. TIME 1 30 V DD Applications TON 2 29 DLM 3 28 DHM SUS AMD Hammer Desktop or Notebook PCs S0 4 27 LXM Multiphase CPU Core Supply S1 5 26 BSTM MAX1544 SHDN 6 25 VROK Voltage-Positioned Step-Down Converters OFS 7 24 D0 Servers/Desktop Computers REF 8 23 D1 ILIM 9 22 D2 V 10 21 D3 CC Quick-PWM is a trademark of Maxim Integrated Products, Inc. THIN QFN Hammer 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 GND 11 40 CSP CCV 12 39 CSN GNDS 13 38 CMN 37 CCI 14 CMP 15 36 FB V+ OAIN- 16 35 BSTS OAIN+ 17 34 LXS 18 33 SKIP DHS 19 32 DLS OVP D4 20 31 PGNDDual-Phase, Quick-PWM Controller for AMD Hammer 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, D0D4 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, OVP 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 = V = V = 5V, V = V = V = V = V = CC DD SHDN TON SKIP S0 S1 OVP FB CMP CMN CSP CSN 1.3V, OFS = SUS = GNDS = D0D4 = 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 0.60V 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 Shutdown, R = 30k 125 TIME 2 MAX1544