MAX6876 19-3479 Rev 0 10/04 EEPROM-Programmable, Quad, Power-Supply Tracker/Sequencer Circuit General Description Features The MAX6876 EEPROM-configurable, multivoltage Tracking/Sequencing for Up to Four Supply power tracker/supervisor monitors four system voltages Voltages (With One MAX6876 Device) and and ensures proper power-up and power-down condi- Tracking for Up to 16 Supply Voltages (Using tions for systems requiring voltage tracking and/or Four MAX6876 Devices) sequencing. The MAX6876 provides a highly config- EEPROM-Configurable Tracking/Sequencing urable solution as key thresholds and timing parame- Control 2 ters are programmed through an I C interface and these values are stored in internal EEPROM. The Bus Voltage Independent Operation (MAX6876 Is MAX6876 also provides supervisory functions and an Powered from the Tracked Supply Voltages or overcurrent detection circuit. Always-On Supply) The MAX6876 features programmable undervoltage and EEPROM-Selectable Undervoltage/Overvoltage- overvoltage thresholds for each input supply. When all Lockout Thresholds for Each Input Supply voltages are within specifications, the device turns on the EEPROM-Selectable Power-Up/Down Slew Rate external n-channel MOSFETs to either sequence or track the voltages to the system. All of the voltages can be Programmable Power-Good Output Thresholds sequenced or tracked or powered up with a combination and Timing of the two options. During tracking, the voltage at the Global Adjustable Undervoltage Lockout or Logic GATE of each MOSFET is increased to slowly turn on ENABLE Input each supply. The voltages at the source of each MOSFET are compared to each other to ensure that the voltage dif- Independent Internal Charge Pumps to Enhance ferential between each monitored supply does not External n-Channel FETs (V = 5V) GATE SOURCE exceed 250mV (typ). Tracking is dynamically adjusted to Post Power-Up Selectable Overcurrent Detection force all outputs to track within a 125mV window from a reference ramp if, for any reason, any supply fails to 0.5V to 5.5V IN Threshold Range track within 250mV from the reference ramp, a FAULT 1.5% Threshold Accuracy output is asserted, the power-up mode is terminated, and 2 I C/SMBus-Compatible Serial Interface all outputs are powered off. Power-up mode is also termi- nated if the controlled voltages fail to complete the ramp- Small 6mm x 6mm, 36-Pin Thin QFN Package up within a programmable FAULT timeout. The MAX6876 features latch-off and autoretry modes to power on again Ordering Information after a fault condition has been detected. PIN- PKG PART TEMP RANGE Other features of the MAX6876 include a reset circuit, a PACKAGE CODE manual reset input (MR), and a margin disable input MAX6876ETX -40C to +85C 36 Thin QFN T3666-3 (MARGIN). The device also features outputs for indicat- ing a power-good condition (PG ) and an overcurrent Pin Configuration condition (OC), and a bus-removal (REM) output. The MAX6876 is available in a small 6mm x 6mm, 36- TOP VIEW pin thin QFN package and is fully specified over the extended -40C to +85C temperature range. 36 35 34 33 32 31 30 29 28 Applications V 1 27 IN4 CC GND 2 26 GATE4 Multivoltage Systems Storage Equipment ABP 3 25 OUT4 TRKEN 4 24 REFIN Networking Systems Servers/Workstations SYNCH 5 23 N.C. MAX6876 HOLD 6 22 PG4 Telecom OC 7 21 PG3 PG2 REM 8 20 EP* FAULT 9 19 PG1 10 11 12 13 14 15 16 17 18 6mm x 6mm *EXPOSED PADDLE THIN QFN SMBus 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. EVALUATION KIT AVAILABLE RESET IN1 ENABLE GATE1 MARGIN OUT1 N.C. IN2 MR GATE2 SDA OUT2 SCL IN3 A0 GATE3 A1 OUT3EEPROM-Programmable, Quad, Power-Supply Tracker/Sequencer Circuit ABSOLUTE MAXIMUM RATINGS (All voltages are referenced to GND, unless otherwise noted.) OUT , GND Current..........................................................50mA GATE .............................................................-0.3V to (IN + 6V) Continuous Power Dissipation (T = +70C) A IN1IN4, V ............................................................-0.3V to +6V 36-Pin, 6mm x 6mm Thin QFN CC OUT1OUT4, SYNCH, ABP, (derate 26.3mW/C above +70C)..............................2105mW REFIN...............................-0.3V to Max (IN1IN4, V ) + 0.3V Operating Temperature Range ...........................-40C to +85C CC ENABLE, TRKEN, HOLD, FAULT, MR, MARGIN......-0.3V to +6V Storage Temperature Range .............................-65C to +150C RESET, PG1PG4, OC, REM....................................-0.3V to +6V Maximum Junction Temperature .....................................+150C SDA, SCL, A0, A1.....................................................-0.3V to +6V Lead Temperature (soldering, 10s) .................................+300C Input/Output Current (all pins except OUT and GND) ...20mA 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 , IN1IN4 = +2.7V to +5.5V ENABLE = MARGIN = MR = ABP = TRKEN T = -40C to +85C, unless otherwise specified. CC A Typical values are at T = +25C.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS GATE = PG = RESET = 0 1.4 Operating Voltage Range V V CC Voltage on ABP (from V or IN1IN4) to CC (Note 2) 2.7 5.5 ensure the device is fully operational Minimum voltage on ABP (from V or CC Undervoltage Lockout V IN1IN4) to ensure the device is EEPROM 2.5 V UVLO configured V = 5.5V, IN1IN4 = 3.3V, no load 1.8 3 CC Supply Current I mA CC Configuration registers or memory access, 2.5 4 no load IN1IN4 (in 20mV increments) 1.00 5.50 IN Threshold Range V V TH IN1IN4 (in 10mV increments) 0.50 3.05 0.5V < IN < 5.5V, IN T = 0C to +85C falling for UV, rising for -1.5 +1.5 % A OV 2V < IN < 5.5V, IN % falling for UV, rising for -2.5 +2.5 OV (20mV increments) 1V < IN < 2V, IN mV falling for UV, rising for -50 +50 Threshold Accuracy OV (20mV increments) T = -40C to A +85C 1V < IN < 3.05V, IN % falling for UV, rising for -2.5 +2.5 OV (10mV increments) 0.5V < IN < 1V, IN mV falling for UV, rising for -25 +25 OV (10mV increments) Threshold Hysteresis V 0.5 %V TH HYS TH RESET Threshold Tempco V 50 ppm/C TH/C 2 MAX6876