MAX17007A/MAX17007B/MAX17008 19-3200 Rev 3 9/10 Dual and Combinable QPWM Graphics Core Controllers for Notebook Computers General Description Features Dual Quick-PWM with Fast Transient Response The MAX17007A/MAX17007B/MAX17008 are dual Quick- PWM step-down controllers intended for general power Automatic Dynamic REFIN1 Detection and PGOOD1/Fault Blanking generation in battery-powered systems. The two switched-mode power supplies (SMPSs) can also be Fixed and Adjustable Output Voltages 0.7% Output Accuracy Over Line and Load combined to operate in a two-phase single-output mode. OUT1: 0 to 2V Dynamic Output or Preset 1.05V Constant on-time Quick-PWM operation provides fast OUT2: 0.7V to 2V Range or Preset 1.5V response to load transients and handles wide input/out- Resistor-Programmable Switching Frequency put (I/O) voltage ratios with ease, while maintaining a rela- Integrated BST Switches tively constant switching frequency. The switching frequency can be individually adjusted between 200kHz Differential Current-Sense Inputs Low-Cost DCR Sensing or Accurate Current- and 600kHz with external resistors. Differential output cur- Sense Resistors rent sensing allows output sense-resistor sensing for an Internally Coupled Current-Sense Compensation accurate current limit, or lossless inductor direct-current Combinable Mode Supports High-Current resistance (DCR) current sensing for lower power dissipa- Dynamic Output Voltages tion while maintaining 0.7% output accuracy. Overvoltage Selectable Forced-PWM, Pulse Skip, or Ultrasonic (MAX17007A/MAX17007B only), undervoltage protection, Mode Operation and accurate user-selectable current limits (15mV, 30mV, 26V Maximum Input Voltage Rating 45mV, and 60mV) ensure robust operations. Independent Enable Inputs The SMPS outputs can operate in skip mode or in ultra- Independent Power-Good Outputs sonic mode for improved light-load efficiency. The ultra- Overvoltage Protection (MAX17007A/MAX17007B sonic mode eliminates audible noises by maintaining a Only) minimum switching frequency of 25kHz in pulse- Undervoltage/Thermal Protection skipping mode. Voltage Soft-Start and Soft-Shutdown The output voltage of SMPS1 can be dynamically adjusted by changing the voltage at the REFIN1 pin. Ordering Information The device includes a 0.5% accurate reference output PART TEMP RANGE PIN-PACKAGE that can be used to set the REFIN1 voltage. An external 5V bias supply is required to power the internal circuitry MAX17007AGTI+ -40C to +105C 28 TQFN-EP* and its gate drivers. MAX17007BGTI+ -40C to +105C 28 TQFN-EP* Independent on/off controls with well-defined logic thresh- MAX17008GTI+ -40C to +105C 28 TQFN-EP* olds and independent open-drain power-good outputs +Denotes a lead(Pb)-free/RoHS-compliant package. provide flexible system configurations. To prevent current *EP = Exposed pad. surges at startup, the internal voltage target is slowly Pin Configuration ramped up from zero to the final target with a slew rate of 1.3mV/s for SMPS1 at CSL1 and 0.65mV/s for SMPS2 TOP VIEW at FB2. To prevent the output from ringing off below 21 20 19 18 17 16 15 ground in shutdown, the internal voltage target is ramped LX2 22 14 LX1 down from its previous value to zero with the same DH2 DH1 respective slew rates. Integrated bootstrap switches 23 13 eliminate the need for external bootstrap diodes. PGOOD2 PGOOD1 24 12 MAX17007A The MAX17007A/MAX17007B/MAX17008 are available EN2 EN1 25 11 MAX17007B in a space-saving, 28-pin, 4mm x 4mm, TQFN package MAX17008 CSH2 CSH1 26 10 with an exposed backside pad. The MAX17007B CSL2 CSL1 27 9 improves crosstalk performance over the MAX17007A. FB2 REFIN1 28 8 Applications + 1 2 3 4 5 6 7 Notebook Computers GPU Core Supplies Low-Power I/O Supplies 2 to 4 Li+ Cells Battery- Powered Devices THIN QFN (4mm x 4mm) 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 REF BST2 ILIM1 PGND (CCI) ILIM2 DL2 V V CC DD SKIP DL1 TON1 GND TON2 BST1Dual and Combinable QPWM Graphics Core Controllers for Notebook Computers ABSOLUTE MAXIMUM RATINGS BST1, BST2 to GND ...............................................-0.3V to +34V DL1 to GND ................................................-0.3V to (V + 0.3V) DD BST1, BST2 to V .................................................-0.3V to +28V DL2 to PGND..............................................-0.3V to (V + 0.3V) DD DD TON1, TON2 to GND..............................................-0.3V to +28V PGND to GND ......................................................-0.3V to + 0.3V V to GND..............................................................-0.3V to +6V REF Short Circuit to GND...........................................Continuous DD V to V ............................................................-0.3V to +0.3V Continuous Power Dissipation (T = +70C) DD CC A LX1 to BST1..............................................................-6V to +0.3V 28-Pin TQFN T2844-1 LX2 to BST2..............................................................-6V to +0.3V (derate 20.8mW/C above +70C) ............................1667mW DH1 to LX1 ..............................................-0.3V to (V + 0.3V) Extended Operating Temperature Range .........-40C to +105C BST1 DH2 to LX2 ..............................................-0.3V to (V + 0.3V) Junction Temperature......................................................+150C BST2 ILIM1, ILIM2, REF to GND ..........................-0.3V to (V + 0.3V) Storage Temperature Range .............................-65C to +150C CC CSH1, CSH2, CSL1, CSL2, FB2, REFIN1 to GND....-0.3V to +6V Lead Temperature (soldering, 10s) .................................+300C EN1, EN2, SKIP, PGOOD1, PGOOD2 to GND.........-0.3V to +6V Soldering Temperature ....................................................+260C 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 (V = 12V, V = V = V = V = 5V, V = 2V, SKIP = GND, T = 0 to +85C, unless otherwise noted. Typical values are IN DD CC EN1 EN2 REFIN1 A at T = +25C.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS PWM CONTROLLER Input Voltage Range V 4.5 26 V IN Quiescent Supply Current Output forced above regulation voltage, I + I 1.7 2.5 mA DD CC (V , V ) V = V = 5V DD CC EN1 EN2 Shutdown Supply Current I EN1 = EN2 = GND, T = +25C 0.1 5 A SHDN A (V , V ) DD CC R = R = 142 194 TON1 TON2 174 V = 12V, IN 97.5k (600kHz) (-15%) (+15%) V = V = CSL1 CSL2 R = R = 305 368 TON1 TON2 On-Time (Note 1) t , t V = 1.2V, ns 336 ON1 ON2 CCI 200k (300kHz) (-10%) (+10%) separate or R = R = 425 575 TON1 TON2 combined mode 500 302.5k (200kHz) (-15%) (+15%) Minimum Off-Time t (Note 1) 250 400 ns OFF(MIN) TON1, TON2, Shutdown Supply I , EN1 = EN2 = GND, V = V = 26V, TON1 TON1 TON2 0.01 1 A Current I V = 0 or 5V, T = +25C TON2 DD A REFIN1 Voltage Range V (Note 2) 0 V V REFIN1 REF FB2 Regulation Voltage V Adjustable mode 0.7 V FB2 FB2 Input Voltage Range Preset mode 1.7 2.3 V V - V - CC CC FB2 Combined-Mode Threshold Combined mode 3.8 V 1V 0.4 REFIN1 Dual Mode V - V - CC CC 3.8 V Switchover Threshold 1V 0.4 I , REFIN1 = 0.5V to 2V REFIN1 REFIN1, FB2 Bias Current -0.1 +0.1 A I V = 0.7V, T = +25C FB2 FB2 A Measured at CSL1, REFIN1 = V , CC V 1.043 1.05 1.057 V CSL1 V = 2V to 26V, SKIP = V (Note 2) IN CC T = +25C -12 +12 SMPS1 Voltage Accuracy REFIN1 = 500mV, A V - CSL1 SKIP = V CC T = 0C to +85C -20 +20 mV A V REFIN1 REFIN1 = 2V, SKIP = V -20 +20 CC Dual Mode is a trademark of Maxim Integrated Products, Inc. 2 MAX17007A/MAX17007B/MAX17008