MAX17480 19-4443 Rev 0 2/09 AMD 2-/3-Output Mobile Serial VID Controller General Description Features The MAX17480 is a triple-output, step-down, fixed- Dual-Output Fixed-Frequency Core Supply frequency controller for AMDs serial VID interface (SVI) Controller CPU and northbridge (NB) core supplies. The MAX17480 Split or Combinable Outputs Detected at consists of two high-current SMPSs for the CPU cores Power-Up and one 4A internal switch SMPS for the NB core. The Dynamic Phase Selection Optimizes two CPU core SMPSs run 180 out-of-phase for true Active/Sleep Efficiency interleaved operation, minimizing input capacitance. The 4A internal switch SMPS runs at twice the switching Transient Phase Repeat Reduces Output frequency of the core SMPS, reducing the size of the Capacitance external components. True Out-of-Phase Operation Reduces Input The MAX17480 is fully AMD SVI compliant. Output volt- Capacitance ages are dynamically changed through a 2-wire SVI, Programmable AC and DC Droop allowing the SMPSs to be individually programmed to Accurate Current Balance and Current Limit different voltages. A slew-rate controller allows con- Integrated Drivers for Large Synchronous- trolled transitions between VID codes and controlled Rectifier MOSFETs soft-start. SVI also allows each SMPS to be individually set into a low-power pulse-skipping state. Programmable 100kHz to 600kHz Switching Frequency Transient phase repeat improves the response of the fixed-frequency architecture, reducing the total output 4V to 26V Battery Input Voltage Range capacitance for the CPU core. A thermistor-based tem- 4A Internal Switch Northbridge SMPS perature sensor provides a programmable thermal-fault 2.7V to 5.5V Input Voltage Range output (VRHOT). 2x Programmable Switching Frequency The MAX17480 includes output overvoltage protection 75m /40m Power Switches (OVP), undervoltage protection (UVP), and thermal pro- 0.5% V Accuracy over Line, Load, and OUT tection. When any of these protection features detect a Temperature fault, the controller shuts down. True differential current sensing improves current limit and load-line accuracy. AMD SVI-Compliant Serial Interface with The MAX17480 has an adjustable switching frequency, Switchable Address allowing 100kHz to 600kHz operation per core SMPS, 7-Bit On-Board DAC: 0 to +1.550V Output Adjust and twice that for the NB SMPS. Range Integrated Boost Switches Applications Adjustable Slew-Rate Control Mobile AMD SVI Core Supplies Power-Good (PWRGD) and Thermal-Fault Multiphase CPU Core Supplies (VRHOT) Outputs Voltage-Positioned, Step-Down Converters System Power-OK (PGD IN) Input Overvoltage, Undervoltage, and Thermal-Fault Notebook/Desktop Computers Protection Voltage Soft-Startup and Passive Shutdown < 1A Typical Shutdown Current Ordering Information PART TEMP RANGE PIN-PACKAGE MAX17480GTL+ -40C to +105C 40 TQFN-EP* +Denotes a lead(Pb)-free/RoHS-compliant package. Pin Configuration appears at end of data sheet. *EP = Exposed pad. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLEAMD 2-/3-Output Mobile Serial VID Controller ABSOLUTE MAXIMUM RATINGS (Note 1) V V V , V to AGND ..............................-0.3V to +6V LX2 to BST2..............................................................-6V to +0.3V DD, IN3, CC DDIO PWRGD to AGND.....................................................-0.3V to +6V LX3 to PGND (Note 2) ..............................................-0.6V to +6V SHDN to AGND ........................................................-0.3V to +6V DH1 to LX1 ..............................................-0.3V to (V + 0.3V) BST1 GNDS1, GNDS2, THRM, VRHOT to AGND..............-0.3V to +6V DH2 to LX2 ..............................................-0.3V to (V + 0.3V) BST2 CSP , CSN , ILIM12 to AGND .................................-0.3V to +6V DL1 to PGND..............................................-0.3V to (V + 0.3V) DD SVC, SVD, PGD IN to AGND ...................................-0.3V to +6V DL2 to PGND..............................................-0.3V to (V + 0.3V) DD FBDC , FBAC , OUT3 to AGND ..............................-0.3V to +6V Continuous Power Dissipation (T = +70C) A OSC, TIME, OPTION, ILIM3 to AGND........-0.3V to (V + 0.3V) 40-Pin TQFN (derate 22.2mW/C above +70C) .......1778mW CC BST1, BST2 to AGND.............................................-0.3V to +36V Operating Temperature Range .........................-40C to +105C BST1, BST2 to V .................................................-0.3V to +30V Junction Temperature......................................................+150C DD BST3 to AGND...................................(V - 0.3V) to (V + 6V) Storage Temperature Range .............................-65C to +150C DD LX3 LX1 to BST1..............................................................-6V to +0.3V Lead Temperature (soldering, 10s) .................................+300C LX3 RMS Current (Note 2).....................................................4A Note 1: Absolute Maximum Ratings measured with 20MHz scope bandwidth. Note 2: LX3 has clamp diodes to PGND and IN3. If continuous current is applied through these diodes, thermal limits must be observed. 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 2, V = 12V, V = V = V = SHDN = PGD IN = 5V, V = 1.8V, OPTION = GNDS = AGND = PGND, IN CC DD IN3 DDIO FBDC = FBAC = OUT3 = CSP = CSN = 1.2V, all DAC codes set to the 1.2V code, T = 0C to +85C, unless otherwise noted. A Typical values are at T = +25C.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS INPUT SUPPLIES V Drain of external high-side MOSFET 4 26 IN V V , V 4.5 5.5 BIAS CC DD Input Voltage Range V V 2.7 5.5 IN3 V 1.0 2.7 DDIO V Undervoltage-Lockout V rising, 50mV typical hysteresis, CC CC V 4.10 4.25 4.45 V UVLO Threshold latched, UV fault Falling edge, typical hysteresis = 1.1V, V Power-On Reset Threshold faults cleared and DL forced high when 1.8 V CC V falls below this level CC V Undervoltage-Lockout V rising, 100mV typical hysteresis, DDIO DDIO 0.7 0.8 0.9 V Threshold latched, UV fault V Undervoltage-Lockout IN3 V rising, 100mV typical hysteresis 2.5 2.6 2.7 V IN3 Threshold Skip mode, FBDC and OUT3 forced Quiescent Supply Current (V) I 5 10 mA CC CC above their regulation points Skip mode, FBDC and OUT3 forced Quiescent Supply Currents (V) I 0.01 1 A DD DD above their regulation points, T = +25C A Quiescent Supply Current (V ) I 10 25 A DDIO DDIO Skip mode, OUT3 forced above its Quiescent Supply Current (IN3) I 50 200 A IN3 regulation point Shutdown Supply Current (V ) SHDN = GND, T = +25C 0.01 1 A CC A 2 MAX17480