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MAX6882 Dataheets PDF



Part Number MAX6882
Manufacturers Maxim Integrated Products
Logo Maxim Integrated Products
Description Power-Supply Sequencers/Supervisors
Datasheet MAX6882 DatasheetMAX6882 Datasheet (PDF)

www.DataSheet4U.com 19-3772; Rev 1; 10/05 Dual-/Triple-Voltage, Power-Supply Sequencers/Supervisors General Description The MAX6880–MAX6883 dual-/triple-voltage monitors are designed to sequence power supplies during power-up condition. When all of the voltages exceed their respective thresholds, these devices turn on voltages to the system sequentially, enhancing n-channel MOSFETs used as switches. The time between each sequenced voltage is determined by an external capacitor, thus allowing f.

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www.DataSheet4U.com 19-3772; Rev 1; 10/05 Dual-/Triple-Voltage, Power-Supply Sequencers/Supervisors General Description The MAX6880–MAX6883 dual-/triple-voltage monitors are designed to sequence power supplies during power-up condition. When all of the voltages exceed their respective thresholds, these devices turn on voltages to the system sequentially, enhancing n-channel MOSFETs used as switches. The time between each sequenced voltage is determined by an external capacitor, thus allowing flexibility in delay timing. The MAX6880/MAX6881 sequence three voltages and the MAX6882/MAX6883 sequence two voltages. These devices initially monitor all of the voltages and when all of them are within their tolerances, the internal charge pumps enhance external n-channel MOSFETs in a sequential manner to apply the voltages to the system. Internal charge pumps drive the gate voltages 5V above the respective input voltage thereby ensuring the MOSFETs are fully enhanced to reduce the on-resistance. The MAX6880–MAX6883 feature capacitor-adjustable slew-rate control to provide controlled turn-on characteristics. After all of the voltages reach 92.5% of their final value, a power-good output (MAX6880/MAX6882) signal is active. The power-good output (PG/RST) can be delayed with an external capacitor to create a power-on reset delay. After the initial power-up phase, the MAX6880–MAX6883 continue to monitor the voltages. If any of the voltages falls below its threshold, the MOSFETs are quickly turned off and the voltages are tracked down together. An internal 100 Ω pulldown resistor ensures that the capacitance at the MOSFET’s source is discharged quickly. The power-good output goes low to provide a system reset. The MAX6880–MAX6883 are available in small 4mm x 4mm 24-pin and 16-pin thin QFN packages and specified over the -40°C to +85°C extended operating temperature range. Features ♦ Capacitor-Adjustable Power-Up Sequencing Delay ♦ Internal Charge Pumps to Enhance External n-Channel FETs ♦ Capacitor-Adjustable Timeout Period Power-Good Output (MAX6880/MAX6882) ♦ Adjustable Undervoltage Lockout or Logic-Enable Input ♦ Internal 100Ω Pulldown for Each Output to Discharge Capacitive Load Quickly ♦ 0.5V to 5.5V Nominal IN_/OUT_ Range ♦ 2.7V to 5.5V Operating Voltage Range ♦ Immune to Short Voltage Transients ♦ Small 4mm x 4mm 24-Pin or 16-Pin Thin QFN Packages MAX6880–MAX6883 Ordering Information PART MAX6880ETG+ MAX6881ETE+ MAX6882ETE+ MAX6883ETE+ TEMP RANGE -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C PINPACKAGE 24 Thin QFN 16 Thin QFN 16 Thin QFN 16 Thin QFN PKG CODE T2444-4 T1644-4 T1644-4 T1644-4 +Denotes lead-free package. Pin Configurations OUT2 OUT3 N.C. TOP VIEW 18 GATE2 19 OUT1 20 GATE1 21 IN3 22 IN2 23 + IN1 24 1 N.C. 17 16 15 14 13 12 11 10 N.C. N.C. TIMEOUT SLEW DELAY GND Applications Multivoltage Systems Networking Systems Telecom Storage Equipment Servers/Workstations MAX6880 EP* MARGIN 9 8 7 6 EN/UV 2 ABP 3 SET3 4 SET2 4mm x 4mm THIN QFN Selector Guide appears at end of data sheet. *EXPOSED PADDLE CONNECTED TO GND. 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 Maxim’s website at www.maxim-ic.com. SET1 PG/RST 5 GATE3 Dual-/Triple-Voltage, Power-Supply Sequencers/Supervisors MAX6880–MAX6883 ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND, unless otherwise noted.) IN1, IN2, IN3.............................................................-0.3V to +6V ABP .........................................-0.3V to the highest of VIN1 - VIN3 SET1, SET2, SET3 ....................................................-0.3V to +6V GATE1, GATE2, GATE3 .........................................-0.3V to +12V OUT1, OUT2, OUT3 .................................................-0.3V to +6V MARGIN ...................................................................-0.3V to +6V PG/RST, EN/UV ........................................................-0.3V to +6V DELAY, SLEW, TIMEOUT .........................................-0.3V to +6V OUT_ Current....................................................................±50mA GND Current.....................................................................±50mA Input/Output Current (all pins except OUT_ and GND) ...........................................................±20mA Continuous Power Dissipation (TA = +70°C) 16-Pin 4mm x 4mm Thin QFN (derate 16.9mW/°C above +70°C) .............................1349mW 24-Pin 4mm x 4mm Thin QFN (derate 20.8mW/°C above +70°C) .............................1667mW Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range .............................-65°C to +150°C Maximum Junction Temperature .....................................+150°C Lead Temperature (soldering, 10s) .......


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