MAX1718 19-1960 Rev 4 8/05 Notebook CPU Step-Down Controller for Intel - Mobile Voltage Positioning (IMVP II) General Description Features Quick-PWM Architecture The MAX1718 step-down controller is intended for core CPU DC-DC converters in notebook computers. It fea- 1% V Accuracy Over Line and Load OUT tures a dynamically adjustable output, ultra-fast transient 5-Bit On-Board DAC with Input Muxes response, high DC accuracy, and high efficiency need- Precision-Adjustable V Slew Control OUT ed for leading-edge CPU core power supplies. Maxims 0.6V to 1.75V Output Adjust Range proprietary Quick-PWM quick-response, constant-on- time PWM control scheme handles wide input/output Precision Offset Control voltage ratios with ease and provides 100ns instant-on Supports Voltage-Positioned Applications response to load transients while maintaining a relatively 2V to 28V Battery Input Range constant switching frequency. Requires a Separate 5V Bias Supply The output voltage can be dynamically adjusted through 200/300/550/1000kHz Switching Frequency the 5-bit digital-to-analog converter (DAC) over a 0.6V to Over/Undervoltage Protection 1.75V range. The MAX1718 has an internal multiplexer that accepts three unique 5-bit VID DAC codes corre- Drives Large Synchronous-Rectifier FETs sponding to Performance, Battery, and Suspend modes. 700A (typ) I Supply Current CC Precision slew-rate control provides just-in-time arrival 2A (typ) Shutdown Supply Current at the new DAC setting, minimizing surge currents to 2V 1% Reference Output and from the battery. VGATE Blanking During Transition The internal DAC of the MAX1718B is synchronized to Small 28-Pin QSOP Package the slew-rate clock for improved operation under aggressive power management of newer chipsets and Ordering Information operating systems that can make incomplete mode tran- sitions. PART TEMP RANGE PIN-PACKAGE A pair of complementary offset control inputs allows MAX1718EEI -40C to +85C 28 QSOP easy compensation for IR drops in PC board traces or MAX1718BEEI+ -40C to +85C 28 QSOP creation of a voltage-positioned power supply. Voltage- MAX1718BEEI -40C to +85C 28 QSOP positioning modifies the load-transient response to MAX1718BEEIB+ -40C to +85C 28 QSOP reduce output capacitor requirements and total system power dissipation. +Denotes lead-free package. Single-stage buck conversion allows these devices to Minimal Operating Circuit directly step down high-voltage batteries for the highest possible efficiency. Alternatively, two-stage conversion 5V INPUT (stepping down the 5V system supply instead of the bat- BATT 2V TO 28V tery) at a higher switching frequency allows the mini- V V CC DD SKP/SDN V+ mum possible physical size. SHUTDOWN ILIM BST The MAX1718 is available in a 28-pin QSOP package. OUTPUT MAX1718 DH 0.6V TO 1.75V D0 D1 LX Applications DUAL MODE VID D2 MUX INPUTS D3 DL IMVP-II Notebook Computers D4 GND 2-Cell to 4-Cell Li+ Battery to CPU Core Supply ZMODE MUX CONTROL SUS Converters SUSPEND S0 5V to CPU Core Supply Converters INPUT S1 FB DECODER NEG TIME Pin Configuration appears at end of data sheet. V POS CC CC REF POWER-GOOD P. VGATE OUTPUT TON OVP Quick-PWM is a trademark of Maxim Integrated Products, Inc. IMVP-II is a trademark of Intel Corp. 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.Notebook CPU Step-Down Controller for Intel - Mobile Voltage Positioning (IMVP II) ABSOLUTE MAXIMUM RATINGS V+ to GND..............................................................-0.3V to +30V LX to BST..................................................................-6V to +0.3V V , V to GND .....................................................-0.3V to +6V REF Short Circuit to GND...........................................Continuous CC DD D0D4, ZMODE, VGATE, OVP, SUS, to GND .........-0.3V to +6V Continuous Power Dissipation SKP/SDN to GND ...................................................-0.3V to +16V 28-Pin QSOP (derate 10.8mW/C above +70C).........860mW ILIM, CC, REF, POS, NEG, S1, S0, Operating Temperature Range ..........................-40C to +85C TON, TIME to GND.................................-0.3V to (V + 0.3V) Junction Temperature......................................................+150C CC Storage Temperature.........................................-65C to +150C DL to GND..................................................-0.3V to (V + 0.3V) DD BST to GND............................................................-0.3V to +36V Lead Temperature (soldering, 10s) .................................+300C DH to LX .....................................................-0.3V to (BST + 0.3V) 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 = SKP/SDN = 5V, V = 1.25V, T = 0C to +85C, unless otherwise noted.) CC DD OUT A PARAMETER CONDITIONS MIN TYP MAX UNITS PWM CONTROLLER Battery voltage, V+ 228 Input Voltage Range V V , V 4.5 5.5 CC DD V+ = 4.5V to 28V, DAC codes from 0.9V to 1.75V -1 +1 % DC Output Voltage Accuracy includes load regulation error DAC codes from 0.6V to 0.875V -1.5 +1.5 % Line Regulation Error V = 4.5V to 5.5V, V = 4.5V to 28V 5 mV CC BATT Input Bias Current FB, POS, NEG -0.2 +0.2 A POS, NEG Common-Mode Range 0.4 2.5 V POS, NEG Differential Range POS - NEG -80 +80 mV POS, NEG Offset Gain V / (POS - NEG) POS - NEG = 50mV 0.81 0.86 0.91 V/V FB 150kHz nominal, R = 120k -8 +8 TIME TIME Frequency Accuracy 380kHz nominal, R = 47k -12 +12 % TIME 38kHz nominal, R = 470k -12 +12 TIME V+ = 5V, FB = 1.2V, TON = GND (1000kHz) 230 260 290 165 190 215 TON = REF (550kHz) On-Time (Note 1) ns V+ = 12V, FB = 1.2V TON = open (300kHz) 320 355 390 TON = V (200kHz) 465 515 565 CC TON = V , open, or REF (200kHz, 300kHz, or 550kHz) 400 500 CC Minimum Off-Time (Note 1) ns TON = GND (1000kHz) 300 375 BIAS AND REFERENCE Quiescent Supply Current (V ) Measured at V , FB forced above the regulation point 700 1200 A CC CC Quiescent Supply Current (V ) Measured at V , FB forced above the regulation point <1 5 A DD DD Quiescent Battery Supply 25 40 A Current (V+) Shutdown Supply Current (V ) SKP/SDN = GND 25 A CC Shutdown Supply Current (V ) <1 5 A SKP/SDN = GND DD Shutdown Battery Supply SKP/SDN = GND, V = V = 0V or 5V <1 5 A CC DD Current (V+) Reference Voltage V = 4.5V to 5.5V, no REF load 1.98 2 2.02 V CC 2 MAX1718