MAX1544ETL+TG51

19-2745; Rev 1; 9/03 KIT ATION EVALU E L B A AVAIL Dual-Phase, Quick-PWM Controller for AMD Hammer CPU Core Power Supplies ♦ Adjustable Slew-Rate Control ♦ Drives Large Synchronous Rectifier MOSFETs ♦ Selectable Output Overvoltage Protection ♦ Undervoltage and Thermal-Fault Protection ♦ Power Sequencing and Timing ♦ Selectable Suspend Voltage ♦ Soft-Shutdown ♦ Selectable Single- or Dual-Phase Pulse Skipping Ordering Information PART TEMP RANGE MAX1544ETL -40°C to +100°C PIN-PACKAGE 40 Thin QFN 6mm ✕ 6mm LXS DHS DLS PGND 34 31 32 V+ BSTS 36 33 CMP 37 35 CSN CMN 38 CSP 39 TOP VIEW 40 Pin Configuration TIME TON SUS S0 S1 SHDN 1 30 2 29 3 28 6 25 OFS REF ILIM 7 24 8 23 VDD DLM DHM LXM BSTM VROK D0 D1 9 22 D2 VCC 10 21 D3 4 27 5 26 18 19 OVP D4 20 17 SKIP 16 15 14 MAX1544 CCI FB OAINOAIN+ Quick-PWM is a trademark of Maxim Integrated Products, Inc. ♦ 4V to 28V Battery Input Voltage Range 13 Servers/Desktop Computers ♦ Selectable 100kHz/200kHz/300kHz/550kHz Switching Frequency 12 Voltage-Positioned Step-Down Converters ♦ 5-Bit On-Board DAC: 0.675V to 1.55V Output Adjust Range 11 Multiphase CPU Core Supply ♦ Active Voltage Positioning with Adjustable Gain and Offset CCV GNDS AMD Hammer Desktop or Notebook PCs ♦ ±0.75% VOUT Accuracy Over Line, Load, and Temperature (1.3V) GND Applications Features ♦ Dual-Phase, Quick-PWM Controller THIN QFN Hammer is a trademark of AMD. ________________________________________________________________ Maxim Integrated Products 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. 1 MAX1544 General Description The MAX1544 is a dual-phase, Quick-PWM™, stepdown controller for AMD Hammer™ CPU core supplies. Dual-phase operation reduces input ripple current requirements and output voltage ripple while easing component selection and layout difficulties. The QuickPWM control scheme provides instantaneous response to fast load-current steps. The MAX1544 includes active voltage positioning with adjustable gain and offset, reducing power dissipation and bulk output capacitance requirements. The MAX1544 is intended for two different notebook CPU core applications: stepping down the battery directly or stepping down the 5V system supply to create the core voltage. The single-stage conversion method allows this device to directly step down high-voltage batteries for the highest possible efficiency. Alternatively, two-stage conversion (stepping down the 5V system supply instead of the battery) at a higher switching frequency provides the minimum possible physical size. The MAX1544 complies with AMD’s desktop and mobile CPU specifications. The switching regulator features soft-start and power-up sequencing, and soft-shutdown. The MAX1544 also features independent four-level logic inputs for setting the suspend voltage (S0–S1). The MAX1544 includes output undervoltage protection, thermal protection, and voltage regulator power-OK (VROK) output. When any of these protection features detect a fault, the controller shuts down. Additionally, the MAX1544 includes selectable overvoltage protection. The MAX1544 is available in a low-profile, 40-pin 6mm x 6mm thin QFN package. For other CPU platforms, refer to the pin-to-pin compatible MAX1519/MAX1545 and MAX1532/MAX1546/MAX1547 data sheets. MAX1544 Dual-Phase, Quick-PWM Controller for AMD Hammer CPU Core Power Supplies ABSOLUTE MAXIMUM RATINGS V+ to GND ..............................................................-0.3V to +30V VCC to GND ..............................................................-0.3V to +6V VDD to PGND............................................................-0.3V to +6V SKIP, SUS, D0–D4 to GND.......................................-0.3V to +6V ILIM, FB, OFS, CCV, CCI, REF, OAIN+, OAIN- to GND.........................................-0.3V to (VCC + 0.3V) CMP, CSP, CMN, CSN, GNDS to GND ......-0.3V to (VCC + 0.3V) TON, TIME, VROK, S0–S1, OVP to GND ....-0.3V to (VCC + 0.3V) SHDN to GND (Note 1)...........................................-0.3V to +18V DLM, DLS to PGND ....................................-0.3V to (VDD + 0.3V) BSTM, BSTS to GND ..............................................-0.3V to +36V DHM to LXM ...........................................-0.3V to (VBSTM + 0.3V) LXM to BSTM............................................................-6V to +0.3V DHS to LXS..............................................-0.3V to (VBSTS + 0.3V) LXS to BSTS .............................................................-6V to +0.3V GND to PGND .......................................................-0.3V to +0.3V REF Short-Circuit Duration .........................................Continuous Continuous Power Dissipation (TA = +70°C) 40-Pin 6mm ✕ 6mm Thin QFN (derate 23.2mW/°C above +70°C) ...............................1.860W Operating Temperature Range .........................-40°C to +100°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C 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, VCC = VDD = V SHDN = VTON = V SKIP = VS0 = VS1 = VOVP = 5V, VFB = VCMP = VCMN = VCSP = VCSN = 1.3V, OFS = SUS = GNDS = D0–D4 = GND; TA = 0°C to +85°C, unless otherwise specified. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS PWM CONTROLLER Battery voltage, V+ Input Voltage Range 4 28 4.5 5.5 DAC codes ≥ 1V -10 +10 DAC codes from 0.60V to 1V -15 +15 VCC, VDD DC Output Voltage Accuracy (Note 2) V+ = 4.5V to 28V, includes load regulation error Line Regulation Error VCC = 4.5V to 5.5V, V+ = 4.5V to 28V Input Bias Current IFB, IGNDS IOFS FB, GNDS OFS OFS Input Range OFS Gain AOFS TIME Frequency Accuracy +2 +0.1 0 2 -0.129 -0.125 -0.117 ∆VOUT/∆VOFS; ∆VOFS = VOFS-VREF, VOFS = 1V to 2V -0.129 -0.125 -0.117 fTIME µA V V/V +200 mV 0.97 0.99 1.01 V/V 1000kHz nominal, RTIME = 15kΩ 900 1000 1100 500kHz nominal, RTIME = 30kΩ 460 500 540 250kHz nominal, RTIME = 60kΩ 225 250 275 ∆VOUT/∆VGNDS Shutdown, RTIME = 30kΩ 2 -2 -0.1 -20 AGNDS mV mV ∆VOUT/∆VOFS; ∆VOFS = VOFS, VOFS = 0 to 1V GNDS Input Range GNDS Gain 5 V 125 _______________________________________________________________________________________ kHz Dual-Phase, Quick-PWM Controller for AMD Hammer CPU Core Power Supplies (Circuit of Figure 1, V+ = 15V, VCC = VDD = V SHDN = VTON = V SKIP = VS0 = VS1 = VOVP = 5V, VFB = VCMP = VCMN = VCSP = VCSN = 1.3V, OFS = SUS = GNDS = D0–D4 = GND; TA = 0°C to +85°C, unless otherwise specified. Typical values are at TA = +25°C.) PARAMETER On-Time (Note 3) SYMBOL tON Minimum Off-Time (Note 3) tOFF(MIN) CONDITIONS V+ = 12V, VFB = VCCI = 1.2V MIN TYP MAX TON = GND (550kHz) 155 180 205 TON = REF (300kHz) 320 355 390 UNITS ns TON = open (200kHz) 475 525 575 TON = VCC (100kHz) 920 1000 1140 TON = GND 300 375 TON = VCC, open, or REF 400 480 1.70 3.20 mA ns BIAS AND REFERENCE Quiescent Supply Current (VCC) ICC Measured at VCC, FB forced above the regulation point, OAIN- = FB, VOAIN+ = 1.3V Quiescent Supply Current (VDD) IDD Measured at VDD, FB forced above the regulation point