MAX17000A Complete DDR2 and DDR3 Memory Power-Management Solution General Description Features SMPS Regulator (VDDQ) The MAX17000A pulse-width modulation (PWM) con- Quick-PWM with 100ns Load-Step Response troller provides a complete power solution for notebook Output VoltagesPreset 1.8V, 1.5V, or DDR, DDR2, and DDR3 memory. It comprises a step- Adjustable 1.0V to 2.5V down controller, a source-sink LDO regulator, and a ref- 1% V Accuracy Over Line and Load OUT erence buffer to generate the required VDDQ, VTT, and 26V Maximum Input Voltage Rating VTTR rails. Accurate Valley Current-Limit Protection The VDDQ rail is supplied by a step-down converter 200kHz to 600kHz Switching Frequency using Maxims proprietary Quick-PWM controller. The Source/Sink Linear Regulator (VTT) high-efficiency, constant-on-time PWM controller han- 2A Peak Source/Sink dles wide input/output voltage ratios (low duty-cycle Low-Output Capacitance Requirement applications) with ease and provides 100ns response Output Voltages-Preset VDDQ/2 or REFIN to load transients while maintaining a relatively constant Adjustable from 0.5V to 1.5V switching frequency. The Quick-PWM architecture cir- Soft-Start/Soft-Shutdown cumvents the poor load-transient timing problems of SMPS Power-Good Window Comparator fixed-frequency current-mode PWMs while also avoid- VTT Power-Good Window Comparator ing the problems caused by widely varying switching frequencies in conventional constant-on-time and con- Selectable Overvoltage Protection stant-off-time PWM schemes. The controller senses the Undervoltage/Thermal Protections current to achieve an accurate valley current-limit pro- 3mA Reference Buffer (VTTR) tection. It is also built in with overvoltage, undervoltage, and thermal protections. The MAX17000A can be set to Ordering Information run in three different modes: power-efficient SKIP mode, low-noise forced-PWM mode, and standby PART TEMP RANGE PIN-PACKAGE mode to support memory in notebook computer stand- MAX17000AETG+ -40C to +85C 24 Thin QFN-EP* by operation. The switching frequency is programma- ble from 200kHz to 600kHz to allow small components +Denotes a lead(Pb)-free/RoHS-compliant package. and high efficiency. The VDDQ output voltage can be *EP = Exposed pad. set to a preset 1.8V or 1.5V, or be adjusted from 1.0V to 2.5V by an external resistor-divider. This output has 1% Pin Configuration accuracy over line-and-load operating range. The MAX17000A includes a 2A source-sink LDO reg- ulator for the memory termination VTT rail. This VTT reg- TOP VIEW ulator has a 5mV deadband that either sources or sinks, ideal for the fast-changing load burst present in 18 17 16 15 14 13 memory termination applications. This feature also V 19 12 CSL reduces output capacitance requirements. DD The VTTR reference buffer sources and sinks 3mA, PGND1 20 11 FB providing the reference voltage needed by the memory AGND 21 10 REFIN controller and devices on the memory bus. MAX17000A The MAX17000A is available in a 24-pin, 4mm x 4mm, SKIP 22 9 VTTI thin QFN package. V VTT 23 8 CC *EP Applications SHDN 24 7 PGND2 Notebook Computers 1 2 3 45 6 DDR, DDR2, and DDR3 Memory Supplies SSTL Memory Supplies THIN QFN 4mm x 4mm Quick-PWM is a trademark of Maxim Integrated Products, Inc. *EXPOSED PAD For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maximintegrated.com. 19-4307 Rev 3 4/13 OVP DL PGOOD1 BST PGOOD2 LX STDBY DH VTTS TON VTTR CSHMAX17000A Complete DDR2 and DDR3 Memory Power-Management Solution ABSOLUTE MAXIMUM RATINGS TON to PGND1.......................................................-0.3V to +28V VTTI to PGND2 .........................................................-0.3V to +6V V to PGND1..........................................................-0.3V to +6V VTT to PGND2 ............................................-0.3V to (V + 0.3V) DD TTI V to V ............................................................-0.3V to +0.3V VTTS to AGND............................................-0.3V to (V + 0.3V) CC DD CC OVP to AGND...........................................................-0.3V to +6V VTTR to AGND ..........................................-0.3V to (V + 0.3V) CSL SHDN, STDBY, SKIP to AGND.................................-0.3V to +6V PGND1, PGND2 to AGND.....................................-0.3V to +0.3V REFIN, FB, PGOOD1, Continuous Power Dissipation (T = +70C) A PGOOD2 to AGND ................................-0.3V to (V + 0.3V) 24-Pin, 4mm x 4mm Thin QFN CC CSH, CSL to AGND....................................-0.3V to (V + 0.3V) (derated 27.8mW/C above +70C) ..........................2222mW CC DL to PGND1..............................................-0.3V to (V + 0.3V) Operating Temperature Range ...........................-40C to +85C DD BST to PGND1...........................................................-1V to +34V Junction Temperature......................................................+150C BST to LX..................................................................-0.3V to +6V Storage Temperature Range .............................-65C to +150C DH to LX....................................................-0.3V to (V + 0.3V) Lead Temperature (soldering, 10s) .................................+300C BST BST to V .............................................................-0.3V to +28V Soldering Temperature (reflow) .......................................+260C DD 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 = 1.8V, STDBY = SKIP = AGND, T = 0C to +85C, unless otherwise noted. IN CC DD SHDN REFIN CSL A Typical values are at T = +25C.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS PWM CONTROLLER V 3 26 IN Input Voltage Range V V , V 4.5 5.5 CC DD FB = AGND 1.485 1.500 1.515 V = 4.5V to 26V, IN Output-Voltage Accuracy V FB = V 1.782 1.800 1.818 V CSL CC SKIP = V CC FB = Adj 0.99 1.000 1.01 Output-Voltage Range V 1 2.7 V CSL Load Regulation Error V - V = 0 to 18mV, SKIP = V 0.1 % CSH CSL CC Line Regulation Error V = 4.5V to 5.5V, V = 4.5V to 26V 0.25 % DD IN Soft-Start Ramp Time t Rising edge of SHDN 1.4 2.1 ms SSTART Soft-Stop Ramp Time t Falling edge of SHDN 2.8 ms SSTOP Soft-Stop Threshold 25 mV R = 96.75k (600kHz), TON -15 +15 167ns nominal V = 12V, R = 200k (300kHz), IN TON On-Time Accuracy (Note 2) t -10 +10 % ON V = 1.2V 333ns nominal CSL R = 303.25k TON -15 +15 (200kHz), 500ns nominal 2 Maxim Integrated