MAX5039/MAX5040 19-2461 Rev 1 12/03 Voltage-Tracking Controllers for PowerPC, DSPs, and ASICs General Description Features The MAX5039/MAX5040 provide intelligent control to Provide Tracking of Two External Power Supplies power systems where two supply voltages need track- During Power-Up and Power-Down ing. These cases include PowerPC , DSP, and ASIC Compatible with a Wide Range of External Power systems, which require a lower CORE voltage supply and a higher I/O voltage supply. Supplies Independent of Output Power The MAX5039/MAX5040 control the output voltage of Bus Voltage Undervoltage Lockout Enables/ the CORE and I/O supplies during power-up, power- Disables CORE and I/O Supplies Together down, and brownout situations. They ensure that the Detect Short Circuit on V and V , Disable CORE I/O two power supplies rise or fall at the same rate, limiting CORE and I/O Supplies in Either Case the voltage difference between the CORE and I/O sup- plies. This eliminates stresses on the processor. The Output Undervoltage Monitoring MAX5039/MAX5040 shut down both the CORE and I/O POK Status (MAX5040) supplies if either one is shorted or otherwise fails to come up. Operating V Supply Voltage Range: 2.5V to 5.5V CC The MAX5040 provides a power-OK (POK) signal that I/O Voltage Range: V to 4V CORE signals the processor if the CORE supply, the I/O sup- ply, and the system bus supply (V ) are above their CORE Voltage Range: 0.8V to V CC I/O respective specified levels. The MAX5039/MAX5040 are targeted for nominal bus V voltages from 4V to CC 5.5V. The MAX5039/MAX5040 work with CORE volt- ages ranging from 800mV to about 3V (depending on Ordering Information the gate-to-source turn-on threshold of the external N- channel MOSFET) and I/O voltages ranging from PART TEMP RANGE PIN-PACKAGE V to 4V. The MAX5039/MAX5040 provide tracking CORE MAX5039EUA-T -40C to +85C 8 MAX control of the I/O and CORE voltages using a single MAX5040EUB-T -40C to +85C 10 MAX external N-channel MOSFET connected across them. This MOSFET is not in series with the power paths and does not dissipate any additional power during normal system operation. The external MOSFET is only on for brief periods during power-up/power-down cycling so a low-cost, small-size MOSFET with a rating of 1/4th to 1/8th of the normal supply current is suitable. The MAX5039/MAX5040 are offered in space-saving I/O V CC 8-pin MAX and 10-pin MAX packages, respectively. WITH MAX5039 CORE OR MAX5040 Applications PowerPC Systems Embedded DSPs and ASICs WITHOUT V CC MAX5039 Embedded 16- and 32-Bit Controller Systems OR MAX5040 I/O Telecom/Base Station/Networking CORE Power-On and Power-Off With and Without Voltage Tracking Typical Operating Circuit and Pin Configurations appear at end of data sheet. PowerPC is a registered trademark of IBM 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. EVALUATION KIT AVAILABLEVoltage-Tracking Controllers for PowerPC, DSPs, and ASICs ABSOLUTE MAXIMUM RATINGS (All Voltages Referenced to GND) Continuous Power Dissipation (T = +70C) A V , NDRV, SDO, and POK ..................................-0.3V to +14V 8-Pin MAX (derate 4.5mW/C above +70C) .............362mW CC CORE FB, UVLO, I/O SENSE, I/O, CORE..........-0.3V to +4.25V 10-Pin MAX (derate 5.6mW/C above +70C) ...........444mW All Pins to V (except POK)............................................. +0.3V Operating Temperature Range ...........................-40C to +85C CC NDRV Continuous Current .................................................50mA Junction Temperature......................................................+150C Continuous Current, All Other Pins .....................................20mA Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C 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 = 2.5V to 5.5V, V = 2V, V = 1.8V, V = 2.5V, V = 1V, V = 2V (MAX5040 only), CC UVLO CORE I/O CORE FB I/O SENSE T = -40C to +85C, unless otherwise specified. Typical values are at V = 5V, T = +25C.) A CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS EXTERNAL SUPPLY CONDITIONS V V (Note 1) 2.5 5.5 V CC CC V Supply Current I 1.3 2.25 mA CC CC Lowest V Where SDO Is Valid V (Note 2) 0.9 V CC CCLO SDO Output Low Voltage at V = V = V , I = 50A, UVLO CC CCLO SDO 0.4 V V = V measure V (Note 2) CC CCLO SDO V rising 2.43 2.5 CC V IC Turn-On Voltage CC V Threshold (Note 3) Hysteresis 0.05 CORE Voltage Range V I/O and CORE valid, V = 5.5V (Notes 4, 5) 0.8 V V CORE CC I/O I/O and CORE valid (Note 5) V > 4V V 4.0 CC CORE I/O Voltage Range V V I/O I/O and CORE valid (Note 5), V V CORE CC 2.5V V 4V CC USER-PROGRAMMABLE UNDERVOLTAGE LOCKOUT V rising 1.200 1.230 1.260 V UVLO UVLO Trip Threshold V UVCC Hysteresis 110 mV UVLO Input Bias Current V = 2V 250 nA UVLO CORE AND I/O REGULATION CORE Feedback, CORE FB, and V 784 800 816 mV C REF Reference Voltage C O RE Regul at or Lar g e-S i g nal Gai n A CORE FB to NDRV 60 dB V CORE Regulator Crossover CORE FB to NDRV 400 kHz Frequency Pullup strength, V 3V 40 80 CC V = 1V, I/O V 2.5V 50 100 V = 2V, I = -10mA CC CORE NDRV NDRV Output Resistance Pulldown strength, V 3V 13 27 CC V = 2V, I/O V 2.5V 17 35 CC V = 1V, I = 10mA CORE NDRV V - V , V falling 60 90 130 I/O-CORE Comparator Trip CORE I/O I/O V mV TH Threshold (Note 6) V - V , V rising -15 0 +15 CORE I/O I/O 2 MAX5039/MAX5040