Network Interface Card Smart Regulator MAX1810 powers peripheral

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Network Interface Card Smart Regulator MAX1810 powers peripheral

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19-1678; 4/00
Network Interface Card Smart Regulator
MAX1810 powers peripheral component interconnect (PCI) Ethernet network interface cards (NICs), modem cards, other devices that utilize both main auxiliary (standby) voltages supplied PCIcompliant systems. device generates uninterrupted +3.3V 500mA from either main standby supply. When both inputs fall below +4.1V, internal switch connects +3.3V auxiliary input output. auxiliary switch resistance only 0.18 minimizes output droop from +3.3V auxiliary supply. addition, MAX1810 guarantees that reverse current flows from output unbiased inactive input, remains stable with little output bypass capacitance output. MAX1810 available compact 8-pin highpower (0.9W) package. Uninterrupted +3.3V Output 500mA Output Current High-Power 0.9W SO-8 Package Thermal Overcurrent Protection Only Output Capacitor Internal 0.18 +3.3V Auxiliary Switch Reverse Current Inactive Inputs
Features
MAX1810
_Applications
Adapter Cards Network Interface Cards Modem Cards
PART MAX1810ESA
Ordering Information
TEMP. RANGE -40oC +85oC PIN-PACKAGE
Typical Operating Circuit
VIEW
MAIN INPUT MAIN +3.3V, 500mA COUT 1.0µF STBY INPUT STBY STBY
Configuration
MAX1810
MAIN
MAX1810
+3.3V INPUT
Maxim Integrated Products
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Network Interface Card Smart Regulator MAX1810
ABSOLUTE MAXIMUM RATINGS
MAIN, STBY, AUX, .-0.3V +6.0V .-0.3V +6.0V Maximum Output Current .1750mA Continuous Power Dissipation +70°C) 8-Pin (derate 11.75mW/°C above +70°C).900mW Operating Temperature Range .-40°C +85°C Junction Temperature .+150°C Storage Temperature Range .-65°C +150°C Lead Temperature (soldering, 10s) .+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
ELECTRICAL CHARACTERISTICS
(VMAIN VSTBY +5.0V, VAUX +3.3V, +85°C, unless otherwise noted. Typical values +25°C.)
PARAMETER MAIN STBY Input Range Input Range Maximum Load Current MAIN STBY Quiescent Current Quiescent Current Reverse Leakage from MAIN STBY Reverse Leakage from MAIN STBY Load Capacitance MAIN STBY Detect Threshold MAIN STBY High Threshold MAIN STBY Hysteresis Voltage Line Regulation Load Regulation Voltage Drop Switch Resistance Disable Threshold Thermal Shutdown Thermal Shutdown Hysteresis Current-Limit Threshold VAUX VOUT +4.5V (VMAIN VSTBY) +5.5V, IOUT 400mA +4.5V< (VMAIN VSTBY) +5.5V IOUT 30mA 400mA, VMAIN VSTBY IOUT 400mA MAIN STBY 1750 3.234 IOUT 10mA VMAIN VSTBY VAUX +3.6V VAUX +3.6V, VMAIN VSTBY VAUX VMAIN VSTBY +5.5V COUT MAIN STBY falling MAIN STBY rising 0.01 0.22 0.180 0.295 3.366 3.925 CONDITIONS 0.75 4.100 4.275 4.475 UNITS
Network Interface Card Smart Regulator
ELECTRICAL CHARACTERISTICS
(VMAIN VSTBY +5.0V, VAUX +3.3V, -40°C +85°C, unless otherwise noted.) (Note
PARAMETER MAIN STBY Input Range Input Range Maximum Load Current MAIN STBY Quiescent Current Quiescent Current Reverse Leakage from MAIN STBY Reverse Leakage from MAIN STBY MAIN STBY Detect Threshold MAIN STBY High Threshold Voltage Voltage Drop Switch Resistance Disable Threshold Current-Limit Threshold IOUT 10mA VMAIN VSTBY VAUX +3.6V VAUX +3.6V, VMAIN VSTBY VAUX VMAIN VSTBY +5.5V MAIN STBY falling MAIN STBY rising +4.5V (VMAIN VSTBY) +5.5V, IOUT 400mA IOUT 400mA MAIN STBY VAUX VOUT 3.234 3.925 CONDITIONS 4.275 4.475 3.366 0.295 1750 UNITS
MAX1810
Note Specifications -40°C guaranteed design, production tested.
Typical Operating Characteristics
(VMAIN, VSTBY +5V, VAUX +3.3V, COUT 1µF, +25°C unless otherwise noted.)
OUTPUT VOLTAGE INPUT VOLTAGE
MAX1810-02 MAX1810-01
MAIN STANDBY UNDERVOLTAGE LOCKOUT
OUTPUT VOLTAGE INPUT VOLTAGE OUTPUT VOLTAGE IOUT 250mA
OUTPUT VOLTAGE OUTPUT CURRENT (MAIN STANDBY)
MAX1810-03
3.35 3.30 OUTPUT VOLTAGE 3.25 3.20 3.15 3.10 3.05 3.00
SWITCH SWITCH BODY DIODE ACTIVE
VMAIN VSTBY IOUT 100mA
INPUT VOLTAGE
OUTPUT CURRENT (mA)
Network Interface Card Smart Regulator MAX1810
Typical Operating Characteristics (continued)
(VMAIN, VSTBY +5V, VAUX +3.3V, COUT 1µF, +25°C unless otherwise noted.)
OUTPUT VOLTAGE OUTPUT CURRENT (AUX)
MAX1810-04
GROUND CURRENT INPUT VOLTAGE (MAIN STANDBY)
MAX1810-05
GROUND CURRENT INPUT VOLTAGE (AUX)
MAX1810-06
1000 GROUND CURRENT (µA) IOUT IOUT 250mA
OUTPUT VOLTAGE
GROUND CURRENT (µA) SWITCH
VMAIN VSTBY IOUT INPUT VOLTAGE INPUT VOLTAGE
OUTPUT CURRENT (mA)
GROUND CURRENT OUTPUT CURRENT (MAIN STANDBY)
MAX1810-07
GROUND CURRENT OUTPUT CURRENT (AUX)
MAX1810-08
ON-RESISTANCE INPUT VOLTAGE
IOUT
MAX1810-09
1400 1200 GROUND CURRENT (µA) 1000 4.2V
VMAIN VSTBY
ON-RESISTANCE
GROUND CURRENT (µA)
OUTPUT CURRENT (mA) OUTPUT CURRENT (mA)
INPUT VOLTAGE
ON-RESISTANCE TEMPERATURE
IOUT 400mA
MAX1810-10
ON-RESISTANCE
TEMPERATURE (°C)
Network Interface Card Smart Regulator
Typical Operating Characteristics (continued)
(VMAIN, VSTBY +5V, VAUX +3.3V, COUT 1µF, +25°C unless otherwise noted.)
MAX1810
MAIN STANDBY LINE-TRANSIENT RESPONSE
MAX1810-11
MAIN STANDBY LOAD-TRANSIENT RESPONSE
MAX1810-12
4.3V IOUT
200mA 10mA
VOUT
20mV/div AC-COUPLED 10mV/div AC-COUPLED IOUT 50mA 200µs/div 40µs/div VOUT
MAIN-T0-STANDBY TRANSITION WAVEFORM
MAX1810-13
MAIN STANDBY TRANSITION WAVEFORM
MAX1810-14
VMAIN
2V/div
MAIN STBY
2.4V
VOUT IOUT 250mA VSTBY 20ms/div
50mV/div AC-COUPLED
VOUT IOUT 250mA VAUX +3.3V 10ms/div
3.3V 100mV/div DC-COUPLED
Description
NAME STBY MAIN Standby Input Main Input +3.3V Output. Bypass with capacitor GND. +3.3V Auxilliary Input Ground. Must connect pins through together ground plane power dissipation. FUNCTION
Network Interface Card Smart Regulator MAX1810
Detailed Description
MAIN STBY STBY MAIN 3.3V
3.3V CONTROL LOGIC
Figure Functional Diagram
MAIN STBY INPUT VOLTAGE 5.5V MAIN STBY GUARANTEED 4.475V DETECTION THRESHOLD RANGE
MAX1810 powers NICs, modem cards, other devices that utilize both main auxiliary power supplies PCI-compliant system, other systems that utilize standby sleep-mode power bus. MAX1810 supplies 3.3V, 500mA output from three inputs: main, standby, +3.3V auxiliary voltage. Each input separately monitored (Figure During normal operation, MAIN input powers fixed +3.3V output (OUT) through internal linear regulator. When MAIN falls below +4.1V disconnected, STBY input powers output through internal linear regulator. When STBY voltage below +4.1V, internal switch connects +3.3V input OUT. input maintains output until falls below +2.5V. Figure shows MAX1810 input transition thresholds. Switchover from input another fast enough prevent from falling below under cases unless inputs below their required voltages. both MAIN STBY above +4.475V, MAIN input supplies output. MAX1810 prevents reverse current from flowing from output unbiased low-voltage input.
Linear Regulators
MAIN STBY inputs generate +3.3V output through linear regulators. Each regulator uses internal P-channel MOSFET pass transistor. MAIN STBY linear regulator will operate until input falls below +4.1V, when shuts off. Either remaining regulator input then powers output. MAIN takes precedence when both MAIN STBY valid.
4.1V(TYP)
+3.3V Switch
0.18 internal switch connects input output when both MAIN STBY below 4.1V greater than 2.5V. When both MAIN STBY below 4.1V unconnected, below 2.5V, internal switch does activate follows less diode drop.
3.925V SWITCH GUARANTEED 2.5V)
Thermal Overcurrent Protection
Thermal overload protection limits total power dissipation MAX1810. When junction temperature exceeds +170°C, MAX1810 turns off. device turns back once junction temperature drops approximately +20°C. continuous short will result pulsed output thermal overload circuitry cycles device off.
Figure MAIN, STBY, Transition Voltages
Network Interface Card Smart Regulator MAX1810
MAXIMUM OUTPUT CURRENT *REQUIRED ONLY INPUT SUPPLIES HAVE NEARBY OUTPUT CAPACITANCE. SUPPLY VOLTAGE MAXIMUM CONTINUOUS CURRENT LIMIT TYPICAL SUPPLY VOLTAGE LIMIT UNDERVOLTAGE LOCKOUT LIMIT MAIN INPUT 2.2µF STBY INPUT 2.2µF +3.3V INPUT 0.1µF MAIN COUT 1.0µF STBY +3.3V, 500mA
+70°C +50°C
MAX1810
+80°C TJ(MAX) +150°C
Figure Power Operating Region: Maximum Output Current Supply Voltage
Figure Typical Application Circuit
Thermal overload protection safeguards MAX1810 event fault conditions. continuous operation, exceed absolute maximum junctiontemperature rating +150°C. Both MAIN STBY regulators also feature overcurrent protection nominally 900mA. switch current limited.
Applications Information
Capacitor Selection
MAX1810 requires ceramic bypass capacitor maintain regulator stability (Figure When switching between input supplies, MAX1810 cause voltage disturbance either MAIN STBY input. Limit this disturbance below hysteresis level (150mV) guarantee precise switchover. MAIN STBY input supplies have filter capacitance their near MAX1810 inputs, then bypass capacitors (2.2µF recommended) needed MAIN STBY. input supplies MAIN STBY already have greater than 2.2µF output capacitance, then additional capacitance required. Place input output filter capacitors close device possible minimize effect lead inductance board traces.
Operating Region Power Dissipation
Maximum power dissipation MAX1810 depends thermal resistance case circuit board, temperature difference between junction ambient air, rate airflow. power dissipation device IOUT (VIN VOUT). resulting maximum power dissipation PMAX ((TJ(MAX) CA)) where TJ(MAX) maximum junction temperature (150°C) ambient temperature, thermal resistance from junction package case, thermal resistance from case through board, copper traces, other materials surrounding (Figure optimum power dissipation, large ground plane with good thermal contact pins through multilayer boards, multiple vias recommended.
Chip Information
TRANSISTOR COUNT: PROCESS: BiCMOS
Network Interface Card Smart Regulator MAX1810
Package Information
SOICN.EPS
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
_Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 2000 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

Network Interface Card Smart Regulator MAX1810 powers peripheral

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