MAX6880MAX6883 19-3772 Rev 1 10/05 Dual-/Triple-Voltage, Power-Supply Sequencers/Supervisors General Description Features The MAX6880MAX6883 dual-/triple-voltage monitors Capacitor-Adjustable Power-Up Sequencing are designed to sequence power supplies during Delay power-up condition. When all of the voltages exceed Internal Charge Pumps to Enhance External their respective thresholds, these devices turn on volt- n-Channel FETs ages to the system sequentially, enhancing n-channel Capacitor-Adjustable Timeout Period Power-Good MOSFETs used as switches. The time between each Output (MAX6880/MAX6882) sequenced voltage is determined by an external capacitor, thus allowing flexibility in delay timing. The Adjustable Undervoltage Lockout or MAX6880/MAX6881 sequence three voltages and the Logic-Enable Input MAX6882/MAX6883 sequence two voltages. Internal 100 Pulldown for Each Output to These devices initially monitor all of the voltages and Discharge Capacitive Load Quickly when all of them are within their tolerances, the inter- 0.5V to 5.5V Nominal IN /OUT Range nal charge pumps enhance external n-channel 2.7V to 5.5V Operating Voltage Range MOSFETs in a sequential manner to apply the volt- ages to the system. Internal charge pumps drive the Immune to Short Voltage Transients gate voltages 5V above the respective input voltage Small 4mm x 4mm 24-Pin or 16-Pin Thin QFN thereby ensuring the MOSFETs are fully enhanced to Packages reduce the on-resistance. The MAX6880MAX6883 feature capacitor-adjustable Ordering Information slew-rate control to provide controlled turn-on charac- teristics. After all of the voltages reach 92.5% of their PIN- PKG PART TEMP RANGE PACKAGE CODE final value, a power-good output (MAX6880/MAX6882) signal is active. The power-good output (PG/RST) can MAX6880ETG+ -40C to +85C 24 Thin QFN T2444-4 be delayed with an external capacitor to create a MAX6881ETE+ -40C to +85C 16 Thin QFN T1644-4 power-on reset delay. After the initial power-up phase, MAX6882ETE+ -40C to +85C 16 Thin QFN T1644-4 the MAX6880MAX6883 continue to monitor the volt- ages. If any of the voltages falls below its threshold, the MAX6883ETE+ -40C to +85C 16 Thin QFN T1644-4 MOSFETs are quickly turned off and the voltages are +Denotes lead-free package. tracked down together. An internal 100 pulldown resistor ensures that the capacitance at the MOSFETs Pin Configurations source is discharged quickly. The power-good output goes low to provide a system reset. TOP VIEW The MAX6880MAX6883 are available in small 4mm x 4mm 24-pin and 16-pin thin QFN packages and speci- 18 17 16 15 14 13 fied over the -40C to +85C extended operating tem- perature range. 12 GATE2 19 N.C. Applications OUT1 20 11 N.C. Multivoltage Systems GATE1 21 10 TIMEOUT MAX6880 Networking Systems IN3 22 9 SLEW Telecom EP* IN2 23 8 DELAY + Storage Equipment IN1 24 7 GND Servers/Workstations 12 3 45 6 4mm x 4mm THIN QFN *EXPOSED PADDLE CONNECTED TO GND. Selector Guide appears at end of data sheet. Pin Configurations continued at end of data sheet. 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. N.C. OUT2 ABP GATE3 SET3 OUT3 SET2 N.C. SET1 PG/RST EN/UV MARGINDual-/Triple-Voltage, Power-Supply Sequencers/Supervisors ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND, unless otherwise noted.) IN1, IN2, IN3.............................................................-0.3V to +6V Input/Output Current (all pins except ABP .........................................-0.3V to the highest of V V OUT and GND) ...........................................................20mA IN1 - IN3 SET1, SET2, SET3 ....................................................-0.3V to +6V Continuous Power Dissipation (T = +70C) A GATE1, GATE2, GATE3 .........................................-0.3V to +12V 16-Pin 4mm x 4mm Thin QFN OUT1, OUT2, OUT3 .................................................-0.3V to +6V (derate 16.9mW/C above +70C).............................1349mW MARGIN ...................................................................-0.3V to +6V 24-Pin 4mm x 4mm Thin QFN PG/RST, EN/UV ........................................................-0.3V to +6V (derate 20.8mW/C above +70C).............................1667mW DELAY, SLEW, TIMEOUT.........................................-0.3V to +6V Operating Temperature Range ...........................-40C to +85C OUT Current....................................................................50mA Storage Temperature Range .............................-65C to +150C GND Current.....................................................................50mA Maximum Junction Temperature .....................................+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 (IN1, IN2, or IN3 = +2.7V to +5.5V, EN/UV = MARGIN = ABP, T = -40C to +85C, unless otherwise specified. Typical values are A at T = +25C, unless otherwise noted.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Voltage on the highest of IN to ensure that 1.4 PG/RST is valid and GATE = 0 Operating Voltage Range IN V Voltage on the highest of IN to ensure the 2.7 5.5 device is fully operational Supply Current I IN1 = 5.5V, IN2 = IN3 = 3.3V, no load 1.1 1.8 mA CC o SET falling, T = +25 C 0.4925 0.5 0.5075 A SET Threshold Range V V TH SET falling, T = -40 C to +85C 0.4875 0.5 0.5125 A SET Threshold Hysteresis V SET rising 0.5 % TH HYST SET Input Current I SET = 0.5V -100 +100 nA SET V Input rising 1.286 EN R EN/UV Input Voltage V V Input falling 1.22 1.25 1.28 EN F EN/UV Input Current I -5 +5 A EN EN/UV Input Pulse Width t EN/UV falling, 100mV overdrive 7 s EN DELAY, TIMEOUT Output Current I (Notes 2, 3) 2.12 2.5 2.88 A D DELAY, TIMEOUT Threshold V = 3.3V 1.25 V CC Voltage SLEW Output Current I ( N ote 4) 22.5 25 27.5 A S Sequence Slew-Rate Timebase SR C = 200pF -15 +15 % SLEW Accuracy Timebase/C Ratio 100pF < C < 1nF 104 k SLEW SLEW S l ew- Rate Accurac y dur i ng P ow er - C = 200pF, V = 5.5V ( N ote 4) -50 +50 % SLEW IN U p and P ow er - D own 2 MAX6880MAX6883