MAX5051AUI+

MAX5051AUI+ Datasheet

MAX5051

Part	Datasheet
MAX5051AUI+	MAX5051AUI+ (pdf)

Related Parts	Information
MAX5051AUI+T	MAX5051AUI+T

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MAX5051 Parallelable, Clamped Two-Switch Power-Supply Controller IC The MAX5051 is a clamped, two-switch power-supply controller IC. This device can be used both in forward or flyback configurations with input voltage ranges from 11V to 76V. It provides comprehensive protection mechanisms against possible faults, resulting in very high reliability power supplies. When used in conjunction with secondary-side synchronous rectification, power-supply efficiencies can easily reach 92% for a +3.3V output power supply operated from a 48V bus. The integrated high- and low-side gate drivers provide more than 2A of peak gate-drive current to two external N-channel MOSFETs. Low startup current reduces the power loss across the bootstrap resistor. A feed-forward voltagemode topology provides excellent line rejection while avoiding the pitfalls of traditional current-mode control. The MAX5051 power-supply controller is primary as well as secondary-side parallelable, allowing the design of scaleable power systems when necessary. When paralleling the primary side, dedicated pins allow for simultaneous wakeup or shutdown of all paralleled units, thus preventing current-hogging during startup or fault conditions. The MAX5051 generates a lookahead signal for driving secondary-side synchronous MOSFETs. Special primary-side synchronization inputs/outputs allow two primaries to be operated 180° out of phase for increased output power and lower input ripple currents. The MAX5051 is available in a 28-pin TSSOP-EP package and operates over a wide -40°C to +125°C temperature range. Warning The MAX5051 is designed to work with high voltages. Exercise caution. o Wide Input Voltage Range, 11V to 76V o Voltage Mode with Input Voltage Feed-Forward o Ripple-Phased Parallel Topology for High Current/Power Output o 2A Integrated High- and Low-Side MOSFET Drivers o SYNCIN And SYNCOUT Pins Enable 180° Out-OfPhase Operation o Programmable Brownout and Bootstrap UVLOs o High-Side Driver Bootstrap Capacitor Precharge Driver o Low Current-Limit Threshold for High Efficiency o Programmable Switching Frequency o Reference Voltage Soft-Start for Startup Without Overshoots o Startup Synchronization with Multiple Paralleled Primaries o Programmable Integrating Current-Limit Fault Protection o Look-Ahead PWM Signal for Secondary-Side Synchronous Rectifier Drivers o Look-Ahead Drivers for Either A High-Speed Optocoupler or Pulse Transformer o Wide -40°C to +125°C Operating Range o Thermally Enhanced 28-Pin TSSOP Package High-Efficiency, Isolated Telecom/Datacom Power Supplies 48V and 12V Server Power Supplies 48V Power-Supply Modules 42V Automotive Power Systems Industrial Power Supplies Ordering Information PART TEMP RANGE MAX5051AUI -40°C to +125°C EP = Exposed pad. PIN-PACKAGE 28-TSSOP-EP Pin Configuration appears 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 MAX5051 Parallelable, Clamped Two-Switch Power-Supply Controller IC ABSOLUTE MAXIMUM RATINGS AVIN, PVIN, XFRMRH to GND................................-0.3V to +80V BST to GND to +95V BST, DRVH to +12V REG9, DRVDD, DRVL to GND................................-0.3V to +12V DRVB, LXVDD, LXL, LXH to GND ..........................-0.3V to +12V UVLO, STT, COMP, CON to GND ..........................-0.3V to +12V FLTINT, RCFF to GND to +12V REG5, CS, CSS, FB to GND to +6V STARTUP, SYNCIN to +6V SYNCOUT, RCOSC to GND to +6V PGND to GND to +0.3V LXL, LXH Current DRVL, DRVH Current DRVL, DRVH Peak Current <500ns ....................................±5A PVIN, REG9 Continuous Current REG5 Continuous Current DRVB, RCFF, RCOSC, CSS Continuous Current .............±20mA COMP, SYNCOUT Continuous Current ............................±20mA REG9, REG5, and COMP Short to GND ....................Continuous Power Dissipation TA = +70°C 28-Pin TSSOP derate 23.8mW/°C above +70°C .....1905mW 28-Pin TSSOP Operating Temperature Range .........................-40°C to +125°C Maximum Junction Temperature TJ ..............................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature soldering, 10s .................................+300°C 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 AVIN = 12V, PVIN = 12V, VUVLO = VSTT = 3V, VCON = 3V, RRCOSC = CCSS = 10nF, CRCOSC = 100pF, CREG9 = 4.7µF, CREG5 = 4.7µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C. All driver, voltage-regulator, and reference outputs unconnected except for bypass capacitors. PARAMETER SUPPLY CURRENT AVIN, PVIN CONDITIONS MIN TYP MAX UNITS AVIN Standby Current PVIN Standby Current IASTBY IPSTBY VAVIN = VPVIN = 11V to 76V VSTARTUP = VCS = 0V VBST = VXFRMRH = VDRVDD = VREG9 RCFF floating 300 450 400 650 AVIN Supply Current PVIN Supply Current AVIN Input Voltage Range +9V LDO REG9 PVIN Input Voltage Range REG9 Output-Voltage Set Point REG9 Line Regulation REG9 Load Regulation REG9 Dropout Voltage REG9 Undervoltage Lockout Threshold REG9 Undervoltage Lockout Threshold Hysteresis +5V LDO REG5 Output-Voltage Set Point REG5 Load Regulation REG5 Dropout Voltage IAVIN IPVIN VAVIN = VPVIN = 11V to 76V VCS = 0V VBST = VDRVDD = VREG9 VXFRMRH = 0V STARTUP, RCFF floating Inferred from AVIN supply current test VPVIN VREG9 Inferred from PVIN supply current test VPVIN = 11V VPVIN = 11V to 76V IREG9 = 0 to 80mA IREG9 = 80mA VREG9 falling VREG5 IREG5 = 0 to 40mA IREG5 = 40mA, measured with respect to VREG9 mV/V MAX5051 Parallelable, Clamped Two-Switch Power-Supply Controller IC ELECTRICAL CHARACTERISTICS continued AVIN = 12V, PVIN = 12V, VUVLO = VSTT = 3V, VCON = 3V, RRCOSC = CCSS = 10nF, CRCOSC = 100pF, CREG9 = 4.7µF, CREG5 = 4.7µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C. All driver, voltage-regulator, and reference outputs unconnected except for bypass capacitors. PARAMETER CONDITIONS SOFT-START/REFERENCE CSS Reference Voltage

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MAX5051

Parallelable, Clamped Two-Switch Power-Supply Controller IC

The MAX5051 is a clamped, two-switch power-supply controller IC. This device can be used both in forward or flyback configurations with input voltage ranges from 11V to 76V. It provides comprehensive protection mechanisms against possible faults, resulting in very high reliability power supplies. When used in conjunction with secondary-side synchronous rectification, power-supply efficiencies can easily reach 92% for a +3.3V output power supply operated from a 48V bus. The integrated high- and low-side gate drivers provide more than 2A of peak gate-drive current to two external N-channel MOSFETs. Low startup current reduces the power loss across the bootstrap resistor. A feed-forward voltagemode topology provides excellent line rejection while avoiding the pitfalls of traditional current-mode control.

The MAX5051 power-supply controller is primary as well as secondary-side parallelable, allowing the design of scaleable power systems when necessary. When paralleling the primary side, dedicated pins allow for simultaneous wakeup or shutdown of all paralleled units, thus preventing current-hogging during startup or fault conditions.

The MAX5051 generates a lookahead signal for driving secondary-side synchronous MOSFETs. Special primary-side synchronization inputs/outputs allow two primaries to be operated 180° out of phase for increased output power and lower input ripple currents.

The MAX5051 is available in a 28-pin TSSOP-EP package and operates over a wide -40°C to +125°C temperature range.

Warning The MAX5051 is designed to work with high voltages. Exercise caution.
o Wide Input Voltage Range, 11V to 76V o Voltage Mode with Input Voltage Feed-Forward o Ripple-Phased Parallel Topology for High

Current/Power Output
o 2A Integrated High- and Low-Side MOSFET Drivers
o SYNCIN And SYNCOUT Pins Enable 180° Out-OfPhase Operation
o Programmable Brownout and Bootstrap UVLOs o High-Side Driver Bootstrap Capacitor Precharge

Driver
o Low Current-Limit Threshold for High Efficiency o Programmable Switching Frequency o Reference Voltage Soft-Start for Startup Without

Overshoots
o Startup Synchronization with Multiple Paralleled Primaries
o Programmable Integrating Current-Limit Fault Protection
o Look-Ahead PWM Signal for Secondary-Side Synchronous Rectifier Drivers
o Look-Ahead Drivers for Either A High-Speed Optocoupler or Pulse Transformer
o Wide -40°C to +125°C Operating Range o Thermally Enhanced 28-Pin TSSOP Package

High-Efficiency, Isolated Telecom/Datacom Power Supplies 48V and 12V Server Power Supplies 48V Power-Supply Modules 42V Automotive Power Systems Industrial Power Supplies
Ordering Information

PART

TEMP RANGE

MAX5051AUI
-40°C to +125°C
*EP = Exposed pad.

PIN-PACKAGE 28-TSSOP-EP*

Pin Configuration appears 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

MAX5051

Parallelable, Clamped Two-Switch Power-Supply Controller IC

ABSOLUTE MAXIMUM RATINGS

AVIN, PVIN, XFRMRH to GND................................-0.3V to +80V BST to GND to +95V BST, DRVH to +12V REG9, DRVDD, DRVL to GND................................-0.3V to +12V DRVB, LXVDD, LXL, LXH to GND ..........................-0.3V to +12V UVLO, STT, COMP, CON to GND ..........................-0.3V to +12V FLTINT, RCFF to GND to +12V REG5, CS, CSS, FB to GND to +6V STARTUP, SYNCIN to +6V SYNCOUT, RCOSC to GND to +6V PGND to GND to +0.3V LXL, LXH Current DRVL, DRVH Current

DRVL, DRVH Peak Current <500ns ....................................±5A PVIN, REG9 Continuous Current REG5 Continuous Current DRVB, RCFF, RCOSC, CSS Continuous Current .............±20mA COMP, SYNCOUT Continuous Current ............................±20mA REG9, REG5, and COMP Short to GND ....................Continuous Power Dissipation TA = +70°C
28-Pin TSSOP derate 23.8mW/°C above +70°C .....1905mW 28-Pin TSSOP Operating Temperature Range .........................-40°C to +125°C Maximum Junction Temperature TJ ..............................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature soldering, 10s .................................+300°C

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

AVIN = 12V, PVIN = 12V, VUVLO = VSTT = 3V, VCON = 3V, RRCOSC = CCSS = 10nF, CRCOSC = 100pF, CREG9 = 4.7µF, CREG5 = 4.7µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C. All driver, voltage-regulator, and reference outputs unconnected except for bypass capacitors.

PARAMETER

SUPPLY CURRENT AVIN, PVIN

CONDITIONS

MIN TYP MAX UNITS

AVIN Standby Current PVIN Standby Current

IASTBY IPSTBY

VAVIN = VPVIN = 11V to 76V VSTARTUP = VCS = 0V VBST = VXFRMRH = VDRVDD = VREG9 RCFF floating
300 450
400 650

AVIN Supply Current

PVIN Supply Current

AVIN Input Voltage Range +9V LDO REG9 PVIN Input Voltage Range REG9 Output-Voltage Set Point REG9 Line Regulation REG9 Load Regulation REG9 Dropout Voltage REG9 Undervoltage Lockout Threshold REG9 Undervoltage Lockout Threshold Hysteresis +5V LDO REG5 Output-Voltage Set Point REG5 Load Regulation

REG5 Dropout Voltage

IAVIN IPVIN

VAVIN = VPVIN = 11V to 76V VCS = 0V VBST = VDRVDD = VREG9 VXFRMRH = 0V STARTUP, RCFF floating

Inferred from AVIN supply current test

VPVIN VREG9

Inferred from PVIN supply current test VPVIN = 11V VPVIN = 11V to 76V IREG9 = 0 to 80mA IREG9 = 80mA

VREG9 falling

VREG5

IREG5 = 0 to 40mA

IREG5 = 40mA, measured with respect to VREG9
mV/V

MAX5051

Parallelable, Clamped Two-Switch Power-Supply Controller IC

ELECTRICAL CHARACTERISTICS continued

AVIN = 12V, PVIN = 12V, VUVLO = VSTT = 3V, VCON = 3V, RRCOSC = CCSS = 10nF, CRCOSC = 100pF, CREG9 = 4.7µF, CREG5 = 4.7µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C. All driver, voltage-regulator, and reference outputs unconnected except for bypass capacitors.

PARAMETER

CONDITIONS

SOFT-START/REFERENCE CSS

Reference Voltage

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Datasheet ID: MAX5051AUI+ 647362