MAX8555 MAXIM [Maxim Integrated Products], MAX8555 Datasheet
MAX8555
Available stocks
Related parts for MAX8555
MAX8555 Summary of contents
Page 1
... MOSFET is turned on, these controllers monitor the load, protecting the bus against overvoltage, undervolt- age, and reverse-current fault conditions. The MAX8555 is available with a 40mV reverse-current threshold, while the MAX8555A is available with a 20mV reverse-current threshold. Overvoltage and undervoltage fault thresholds are adjustable and can be disabled. The current-limit trip points are set by the external MOSFETs’ ...
Page 2
Low-Cost, High-Reliability, 0.5V to 3.3V ORing MOSFET Controllers ABSOLUTE MAXIMUM RATINGS GATE to GND .........................................................-0.3V to +12V FAULT GND ...................................................-0.3V to +6V OVP, UVP, TIMER, CS+, CS- to GND .......-0. GND..................................................(V DD Continuous Power ...
Page 3
... V = 2.5V CS+ R TIMER 2.5V, TIMER CS TIMER 2.5V, TIMER CS TIMER V TIMER I fault REV = V = +5V CS GATE CS+ MAX8555 MAX8555A = 50kΩ FAULT VDD GATE MIN TYP MAX 1.22 1.25 1.28 85 100 115 1.0 0.5 0 100 120 open 25k ...
Page 4
Low-Cost, High-Reliability, 0.5V to 3.3V ORing MOSFET Controllers ELECTRICAL CHARACTERISTICS (continued 12V 1.4V 1.5V CS- CS 0°C to +85°C, unless otherwise noted.) A PARAMETER OVERVOLTAGE PROTECTION OVP rising OVP Fault ...
Page 5
... MOSFET Controllers = 25kΩ 1V 0.25V, R TIMER UVP OVP CONDITIONS = 1.0V = 1.5V = 10mA = 0.4V MAX8555 MAX8555A R = open TIMER = V = 2.5V CS 25k TIMER V falling TIMER I fault REV MAX8555 MAX8555A = 50kΩ 0.01µF, FAULT VDD GATE VL MIN TYP MAX 1.22 1.28 85 115 15 1 1.1 0.5 0 120 ...
Page 6
... Low-Cost, High-Reliability, 0.5V to 3.3V ORing MOSFET Controllers (V = 12V 1.5V 25kΩ CS+ TIMER +25° 2Ω in Figure 3, MAX8555A, unless otherwise noted.) GATE-CHARGE CURRENT vs. TIMER RESISTOR (V = 12V +85° -40° +25° 100 1000 TIMER RESISTOR (kΩ) REVERSE-CURRENT THRESHOLD vs. ...
Page 7
... Low-Cost, High-Reliability, 0.5V to 3.3V ORing (V = 12V 1.5V 25kΩ CS+ TIMER +25° 2Ω in Figure 3, MAX8555A, unless otherwise noted.) POWER-UP AND DOWN WAVEFORMS USING TIMER V TIMER V GATE I MOSFET 5ms/div UVP SHUTDOWN WAVEFORMS V FAULT V GATE V CS- AC-COUPLED V UVP 200ns/div POWER-SUPPLY OUTPUT SHORT-CIRCUIT SHUTDOWN WAVEFORMS ...
Page 8
Low-Cost, High-Reliability, 0.5V to 3.3V ORing MOSFET Controllers PIN NAME FUNCTION Gate-Drive Output. Nominal GATE load is a 0.01µF capacitor to ground. Gate is discharged to GND in 1 GATE shutdown. 2 GND Ground Low-Voltage Optional Input Power. Leave disconnected ...
Page 9
... Low-Cost, High-Reliability, 0.5V to 3.3V ORing GATE VL CHARGE PUMP CLK VL CONTROL LOGIC FAULT I OSC TIMER 1.25V REF MAX8555/ (MAX8555A) V Figure 1. MAX8555/MAX8555A Functional Diagram _______________________________________________________________________________________ MOSFET Controllers 100mV (50mV) SHUTDOWN VOLTAGE SHARE REVERSE CURRENT FORWARD CURRENT OVERVOLTAGE INTERNAL OVERVOLTAGE EXTERNAL UNDERVOLTAGE ENABLE VL VL REGULATOR GND ...
Page 10
Low-Cost, High-Reliability, 0.5V to 3.3V ORing MOSFET Controllers CS- + 10mV CS- CS- - 40mV/20mV CS- - 100mV/50mV V LATCH SET SHARE CS+ 4.1ms I FORWARD I REVERSE V = ((CS-) - CS+) < 0.1V/0.05V SHARE I = ((CS+) - ...
Page 11
... CS+ and CS- inputs. CS+ connects ), the CS- to the positive side of the input voltage. CS- connects to the positive side of the system bus. The MAX8555/ MAX8555A use the voltage drop across CS+ and CS- to determine operating mode and must be greater than 0.01V (typ) to ...
Page 12
... R2A R6 47kΩ 1kΩ R2B 150pF 150pF 6.04kΩ FAULT OVP Figure 2. OVP Connection when Multiple MAX8555s Are Used (defined as V > 0.01V), the MAX8555/ CS+ CS- MAX8555A discharge GATE to GND and FAULT is latched low. If the I condition is not detected, FORWARD OVP is disabled. In redundant systems, when one input ...
Page 13
... R9 1kΩ 2kΩ R10 665Ω C4 1000pF 2Ω 1000pF 0.01µF GATE CS- CS+ 5V FAULT VL MAX8555 MAX8555A UVP OVP TIMER GND C2 0.01µF R7 24.9kΩ Applications Information OUTPUT: 1.5V/20A C3 1000pF R5 R2 15kΩ 51kΩ R6 10kΩ OUTPUT: 1.5V/20A R5 R2 15kΩ ...
Page 14
... To dissipate the heat generated by the MOSFET, make the power traces very wide with a large amount of copper area and place the MAX8555 as close as possible to the drain of the external MOS- FET. A more efficient way to achieve good power dissi- ...
Page 15
... Low-Cost, High-Reliability, 0.5V to 3.3V ORing OUT+ INPUT SUPPLY OUT- Chip Information TRANSISTOR COUNT: 2309 PROCESS: BiCMOS ______________________________________________________________________________________ MOSFET Controllers GATE CS 13.25V CS FAULT MAX8555/ UVP MAX8555A VL OVP TIMER GND Typical Operating Circuit OUTPUT: 1.5V AT 20A 15 ...
Page 16
Low-Cost, High-Reliability, 0.5V to 3.3V ORing MOSFET Controllers (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages PIN 1 INDEX AREA NUMBER OF LEADS ...
Page 17
Low-Cost, High-Reliability, 0.5V to 3.3V ORing (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, www.maxim-ic.com/packages ÿ 0.50±0.1 0.6±0.1 1 0.6±0.1 TOP VIEW D2 A2 ...