MAX17409 19-4590 Rev 1 7/09 1-Phase Quick-PWM GPU Controller General Description Features The MAX17409 is a 1-phase Quick-PWM step-down 1-Phase Quick-PWM Controller VID power-supply controller for high-performance graph- 6mV V Accuracy Over Line, Load, and OUT ics processors. The Quick-PWM control provides instan- Temperature taneous response to fast-load current steps. Active 6-Bit Graphics DAC (12.5mV LSB) voltage positioning reduces power dissipation and bulk output capacitance requirements and allows ideal posi- Active Voltage Positioning with Adjustable Gain tioning compensation for tantalum, polymer, or ceramic Accurate Droop and Current Limit bulk output capacitors. Remote Output and Ground Sense The MAX17409 is intended for two different notebook Buffered 2V Reference Output for Offsets processor core applications: either bucking down the bat- tery directly to create the core voltage, or bucking down Power-Good Window Comparator the +5V system supply. The single-stage conversion Temperature Comparator method allows this device to directly step down high-volt- Drives Large Synchronous Rectifier FETs age batteries for the highest possible efficiency. Alternatively, 2-stage conversion (stepping down the +5V 2V to 26V Power Input Range system supply instead of the battery) at higher switching Adjustable Switching Frequency (600kHz max) frequency provides the minimum possible physical size. Output Overvoltage and Undervoltage Protection A slew-rate controller allows controlled transitions Soft-Startup and Soft-Shutdown between VID codes. A thermistor-based temperature sensor provides programmable thermal protection. Internal Boost Diodes The MAX17409 is available in a 28-pin, 4mm x 4mm TQFN package. Ordering Information Applications PART TEMP RANGE PIN-PACKAGE Graphics Core (GPU) Power Supplies MAX17409GTI+ -40C to +105C 28 TQFN-EP* Voltage-Positioned Step-Down Converters +Denotes a lead(Pb)-free/RoHS-compliant package. 2-to-4 Li+ Cells Battery to Processor Core *EP = Exposed pad. Supply Converters Notebooks/Desktops/Servers Pin Configuration TOP VIEW 21 20 19 18 17 16 15 DH 22 14 G3 GND 23 13 G2 24 12 G1 VRHOT MAX17409 G0 25 11 REF PAD 26 10 ILIM SHDN GND 9 PWRGD V 27 CC 28 8 CCV TON 12 3 45 6 7 THIN QFN Quick-PWM is a trademark of Maxim Integrated Products, Inc. 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 AVAILABLE IMON LX GNDS/OFSP BST FB V DD CSN DL PGND CSP SKIP G5 G4 THRM1-Phase Quick-PWM GPU Controller ABSOLUTE MAXIMUM RATINGS V , V to GND .....................................................-0.3V to +6V LX to BST...............................................................-6V to +0.3V CC DD G0G5 to GND .........................................................-0.3V to +6V BST to V ..........................................................-0.3V to +30V DD CSP, CSN to GND ....................................................-0.3V to +6V DH to LX .................................................-0.3V to (V + 0.3V) BST ILIM, THRM, VRHOT, PWRGD to GND ....................-0.3V to +6V Continuous Power Dissipation (T = +70C) A SKIP to GND.............................................................-0.3V to +6V 28-Pin 4mm x 4mm TQFN CCV, FB, IMON, REF to GND.....................-0.3V to (V + 0.3V) (derate 21.3mW/C above +70C) ............................1702mW CC SHDN to GND (Note 1)...........................................-0.3V to +30V Operating Temperature Range .........................-40C to +105C TON to GND ...........................................................-0.3V to +30V Junction Temperature......................................................+150C GNDS/OFSP, PGND to GND (Note 2)...................-0.3V to +0.3V Storage Temperature Range .............................-65C to +165C Internal Driver (Note 2) Lead Temperature (soldering, 10s) .................................+300C DL to PGND.............................................-0.3V to (V + 0.3V) DD BST to GND.........................................................-0.3V to +36V Note 1:SHDN might be forced to 12V for the purpose of debugging prototype breadboards using the no-fault test mode, which dis- ables fault protection. Note 2: Measurements valid using a 20MHz bandwidth limit. 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 = 12V, V = V = 5V, SHDN = ILIM = V , SKIP = GNDS = PGND = GND, V = V = V = 1.05V IN DD CC CC FB CSP CSN G5G0 set for 1.05V (G0G5 = 100110) T = 0C to +85C, unless otherwise specified. Typical values are at T = +25C.) (Note 3) A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS PWM CONTROLLER Input Voltage Range V , V 4.5 5.5 V CC DD Measured at FB with respect to GNDS DC Output-Voltage Accuracy -6 +6 mV includes load-regulation error (Note 4) Line Regulation Error V = 4.5V to 5.5V, V = 4.5V to 26V 0.1 % CC IN GNDS Input Range -200 +200 mV GNDS/OFSP Gain A V / V , -200mV V +200mV 0.97 1.00 1.03 V/V GNDS OUT GNDS GNDS GNDS/OFSP Input Bias Current I -2 +2 A GNDS V = 4.5V to 5.5V, I = 100A 1.98 2.000 2.02 CC REF REF Voltage V V REF I = 0 to 1mA 1.97 2.000 2.02 REF Dynamic VID Slew-Rate Accuracy 11.0 12.5 14.0 mV/s Soft-Start/Soft-Shutdown 1.248 1.56 1.872 mV/s Slew-Rate Accuracy R = 96.75k 142 167 192 TON On-Time (Note 5) t V = 12V, V = 1.2V R = 200k 300 333 366 ns ON IN FB TON R = 303.25k 425 500 575 TON Minimum Off-Time t Measured at DH (Note 5) 300 375 ns OFF(MIN) TON Shutdown Input Current SHDN = GND, V = 26V, V = V = 0 or 5V 0.01 0.1 A IN CC DD 2 MAX17409