MAX5043ETN+ ,Two-Switch Power ICs with Integrated Power MOSFETs and Hot-Swap ControllerApplicationsMAX5042ATN -40°C to +125°C 56 TQFN● High-Eficiency Telecom/Datacom Power SuppliesMAX504 ..
MAX5048AAUT ,7.6A, 12ns, SOT23/TDFN MOSFET DriverFeaturesThe MAX5048A/MAX5048B are high-speed MOSFET ♦ Independent Source-and-Sink Outputs fordriver ..
MAX5048AAUT#TG16 ,7.6A, 12ns, SOT23/TDFN MOSFET DriverApplicationsV /2CCMAX5048AAUT-T -40°C to +125°C 6 SOT23 ABECCMOSPower MOSFET SwitchingMAX5048BAUT-T ..
MAX5048BATT ,7.6A, 12ns, SOT23/TDFN MOSFET Driver MAX50487.6A, 12ns, SOT23/TDFN, MOSFET Driver
MAX5048BATT+T ,7.6A, 12ns, SOT23/TDFN MOSFET Driver MAX50487.6A, 12ns, SOT23/TDFN, MOSFET Driver
MAX5048BAUT ,7.6A, 12ns, SOT23/TDFN MOSFET DriverELECTRICAL CHARACTERISTICS(V+ = +12V, T = -40°C to +125°C, unless otherwise noted. Typical values a ..
MAX923CUA ,Ultra Low-Power, Single/Dual-Supply ComparatorsMAX921–MAX92419-0115; Rev 3; 3/95Ultra Low-Power, Single/Dual-Supply Comparators_______________
MAX923CUA+ ,Ultra Low-Power, Single/Dual-Supply ComparatorsApplications5 HYSTBattery-Powered SystemsThreshold DetectorsMAX9216 REFWindow ComparatorsGNDV-Oscil ..
MAX923ESA ,Ultra Low-Power, Single/Dual-Supply ComparatorsELECTRICAL CHARACTERISTICS: 5V OPERATION(V+ = 5V, V- = GND = 0V, T = T to T , unless otherwise note ..
MAX923ESA+ ,Ultra Low-Power, Single/Dual-Supply ComparatorsELECTRICAL CHARACTERISTICS: 5V OPERATION (continued)(V+ = 5V, V- = GND = 0V, T = T to T , unless ot ..
MAX923MSA/PR ,Ultra Low-Power, Single/Dual-Supply ComparatorsELECTRICAL CHARACTERISTICS: 5V OPERATION (continued)(V+ = 5V, V- = GND = 0V, T = T to T , unless ot ..
MAX924 ,Ultra-Low-Power, Single/Dual Supply Comparator with 1% Precision Referenceapplications, the Dual ±1.25V to ±5.5VMAX921–MAX924 operate from a single +2.5V to +11V♦ Input Volt ..
MAX5043ETN+
Two-Switch Power ICs with Integrated Power MOSFETs and Hot-Swap Controller
General DescriptionThe MAX5042/MAX5043 isolated multimode PWM power
ICs feature integrated switching power MOSFETs con-
nected in a voltage-clamped, two-transistor, power-circuit
configuration. These devices operate from a wide 20V to
76V input voltage range. The MAX5042 includes a hot-
swap controller for use with an external power MOSFET
to limit inrush current for applications where the power
supply is plugged into a live power backplane. The
MAX5043 does not include a hot-swap controller.
The voltage-clamped power topology of the MAX5042/
MAX5043 enables full recovery of stored magnetizing
and leakage inductive energy for enhanced efficiency and
reliability. Operating at up to 500kHz switching frequency,
these devices provide up to 50W of output power. The
MAX5042/MAX5043 allow the implementation of both
forward and flyback voltage or current-mode converter
topologies. A dedicated latched external shutdown pro-
vides protection in addition to internal thermal shutdown.
The MAX5042/MAX5043 achieve higher efficiency when
used with secondary-side synchronous rectification.
These devices generate a look-ahead signal for driving
secondary-side synchronous rectifiers.
The MAX5042/MAX5043 are rated for operation over the
-40°C to +125°C and -40°C to +85°C temperature range,
respectively, and are available in a small surface-mount
56-pin TQFN package.
Warning: The MAX5042/MAX5043 are designed to
work with high voltages. Exercise caution.
Applications●High-Eficiency Telecom/Datacom Power Supplies●Router/Switch Cards with 48V Backplane Power
Systems●Servers with 48V Backplane Power Systems●xDSL Line Cards●xDSL Line-Driver Power Supplies●Distributed Power Systems with 48V Bus●Power-Supply Modules
Features●Reliable Single-Stage Clamped Two-Switch Power
ICs for High Efficiency●No Reset Winding Required●Up to 50W Output Power●Integrated High-Voltage 75mΩ Power MOSFETs●20V to 76V Wide Input Voltage Range●Feed-Forward Voltage or Current-Mode Control●Programmable Brownout Undervoltage Lockout●Integrated Current Signal Amplifier for High-
Efficiency, Current-Mode Control●Internal Overtemperature Shutdown●Indefinite Short-Circuit Protection●Integrated Thermally Protected High-Voltage Startup Linear Regulator●Integrated Hot-Swap Controller (MAX5042)●Integrated Look-Ahead Signal Output Drives High-
Speed Optocoupler for Secondary-Side Synchronous
Rectification●>90% Efficiency with Synchronous Rectification●Up to 500kHz Switching Frequency●High-Power, Small-Footprint 56-Pin Thermally
Enhanced TQFN Package
Pin Configurations appear at end of data sheet.
PARTTEMP RANGEPIN-PACKAGE
MAX5042ATN-40°C to +125°C56 TQFN
MAX5043ETN-40°C to +85°C56 TQFN
PARTDESCRIPTIONMAX5042
Two-Switch Power IC with Integrated Power
MOSFETs and Hot-Swap Controller for
Isolated Power Supplies
MAX5043Two-Switch Power IC with Integrated Power
MOSFETs for Isolated Power Supplies
MAX5042/MAX5043Two-Switch Power ICs with Integrated
Power MOSFETs and Hot-Swap Controller
Ordering Information
Selector Guide
EVALUATION KIT AVAILABLE
PWMNEG, POSINPWM, DRNH, XFRMRH, XFRMRL, SRC to NEGIN ................-0.3V to +80V
BST to NEGIN .......................................................-0.3V to +95V
BST to XFRMRH ...................................................-0.3V to +12V
SRC to PWMNEG ...................................................-0.3V to +6V
REG15 to PWMNEG .............................................-0.3V to +40V
REG15 to POSINPWM..........................................-80V to +0.3VREG9, DRVIN to PWMNEG ..................................-0.3V to +12V
REG5 to PWMNEG .................................................-0.3V to +6V
REG15 Current .................................................................±80mA
REG9 Current .....................................................................40mA
REG5 Current .....................................................................20mAUVLO, RAMP, CSS, FLTINT, CSOUT,
RCFF, RCOSC to PWMNEG .............................-0.3V to +12V
OPTO, PWMSD, SYNC, CSP, CSN, DRVDEL to PWMNEG.........................................-0.3V to +6V
PPWM to PWMNEG ..............................-0.3V to (REG5 + 0.3V)
PPWM Current ................................................................±20mA
PWMPNEG to PWMNEG .....................................-0.3V to +0.3VDRNH Continuous Average Current (all pins combined)
TJ = +125°C ........................................................................2A
TJ = +150°C .....................................................................1.4A
XFRMRH Continuous Average Current (all pins combined)
TJ = +125°C ........................................................................2A
TJ = +150°C .....................................................................1.4AXFRMRL Continuous Average Current (all pins combined)
TJ = +125°C ........................................................................2A
TJ = +150°C .....................................................................1.4A
SRC Continuous Current (all pins combined)
TJ = +125°C ........................................................................2A
TJ = +150°C .....................................................................1.4A
POSINHS to NEGIN ..............................................-0.3V to +80V
HSEN to NEGIN ......................................................-0.3V to +4VDEN to PWMNEG ...................................................-0.3V to +4V
HSGATE to NEGIN ...............................................-0.3V to +12VHSDRAIN, HSOK to NEGIN .................................-0.3V to +80V
HSOK Current ....................................................................20mAContinuous Power Dissipation (TA = +70°C)
56-Pin TQFN (derate 47.6mW/°C above +70°C) ............3.8W
Operating Temperature Range
MAX5042ATN ...............................................-40°C to +125°C
MAX5043ETN .................................................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range ............................-65°C to +150°CLead Temperature (soldering, 10s) .................................+300°C
(See the Absolute Maximum Ratings Diagram below to better understand the absolute maximum ratings of the various blocks.)
TQFN Junction-to-Ambient Thermal Resistance (θJA) ..........21°C/W
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
PWMNEG,
PWMPNEG,
HSDRAIN,
HSOK
POSINHS,
POSINPWM
REG15
REG9, UVLO, RAMP, CSS, FLTINT,
CSOUT, RCFF, RCOSC, DRVIN
REG5, OPTO, PWMSD, SYNC, CSP,
CSN, DRVDEL, SRC, PPWM
HSEN
HSGATE
XFRMRL
XFRMRH, DRNH
BST
DEN
80V
80V80V
40V
12V
80V
12V
12V
80V
80V
95V
MAX5042/MAX5043Two-Switch Power ICs with Integrated
Power MOSFETs and Hot-Swap Controller
Absolute Maximum Ratings
Absolute Maximum Ratings Diagram
Package Thermal Characteristics (Note 1)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.
(VPOSINPWM = 20V to 76V, VREG15 = 18V, CREG15 = 4.7µF, CREG9 = 1µF, CREG5 = 1µF, RRCOSC = 24kΩ, CRCOSC = 100pF, CBST
= 0.22µF, RDRVDEL = 10kΩ, CDRVDEL = 0.22µF, VCSS = VCSP = VCSN = VRAMP = VPWMNEG = VNEGIN = 0, TA = TMIN to TMAX,
unless otherwise noted. Typical values are at VPOSINPWM = 48V, TA = +25°C, unless otherwise noted. All voltages are referred to
PWMNEG, unless otherwise noted.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSInput Supply RangeVPOSINPWM2076V
REG15 REGULATORREG15 Output Voltage RangeVREG15VPOSINPWM = 20V to 76V13.016.6V
REG15 Output Voltage Load
Regulation
VPOSINPWM = 20V,
IREG15 = 0 to 80mA1.5V
REG15 Output CurrentInferred from load regulation test80mA
REG15 Current LimitREG15 shorted to PWMNEG with 10Ω140mA
REG15 Overdrive Voltage1840V
REG9 REGULATORREG9 Output Voltage RangeVREG15 = 18V to 40V8.310.1V
REG9 Output Voltage Load
RegulationIREG9 = 0 to 40mA0.35V
REG9 Output CurrentInferred from load regulation test40mA
REG9 Current LimitREG9 shorted to PWMNEG with 10Ω100mA
REG5 REGULATORREG5 Output Voltage RangeVREG15 = 18V to 40V4.55.5V
REG5 Output Voltage Load
RegulationIREG5 = 0 to 20mA0.35V
REG5 Output CurrentInferred from load regulation test20mA
REG5 Current LimitREG5 shorted to PWMNEG with 10Ω40mA
PWM COMPARATORCommon-Mode RangeVCM-PWM05.5V
Input Offset Voltage10mV
Input Bias Current-2.5+2.5µA
Propagation Delay50mV overdrive, 0 ≤ VCM-PWM ≤ 5.5V70ns
RCOSC OSCILLATORPWM PeriodtOSC-PWM3.9µs
Maximum Duty Cycle47%
Maximum RCOSC FrequencyfRCOSC1.2MHz
RCOSC Peak Trip LevelVTH2.55V
RCOSC Valley Trip Level0.2V
RCOSC Input Bias Current-0.3µA
RCOSC Discharge MOSFET RDS(ON)Sinking 10mA60120Ω
RCOSC Discharge Pulse Width50ns
SYNC High Level3.5V
SYNC Low Level0.8V
MAX5042/MAX5043Two-Switch Power ICs with Integrated
Power MOSFETs and Hot-Swap Controller
Electrical Characteristics
(VPOSINPWM = 20V to 76V, VREG15 = 18V, CREG15 = 4.7µF, CREG9 = 1µF, CREG5 = 1µF, RRCOSC = 24kΩ, CRCOSC = 100pF, CBST
= 0.22µF, RDRVDEL = 10kΩ, CDRVDEL = 0.22µF, VCSS = VCSP = VCSN = VRAMP = VPWMNEG = VNEGIN = 0, TA = TMIN to TMAX,
unless otherwise noted. Typical values are at VPOSINPWM = 48V, TA = +25°C, unless otherwise noted. All voltages are referred to
PWMNEG, unless otherwise noted.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSSYNC Leakage Current±1µA
SYNC Maximum FrequencyfSYNC2.4MHz
SYNC On-Time50ns
SYNC Off-Time200ns
PWM LOGICPWM Comparator Propagation Delay70ns
PPWM to XFRMRL DelayPPWM rising120ns
DRVDEL Reference Voltage1.141.38V
PPWM Output HighSourcing 2mA2.8V
PPWM Output LowSinking 2mA0.4V
PWMSD Logic High3.5V
PWMSD Logic Low0.8V
PWMSD Leakage Current±1µA
SOFT-STARTSoft-Start CurrentICSS33µA
Minimum OPTO VoltageCSS = 0, sinking 2mA1.4V
RAMP GENERATORMinimum RCFF VoltageRCFF sinking 2mA2.1V
RCFF Leakage±0.1±1µA
OVERLOAD FAULTFLTINT Pulse CurrentIFLTINT80µA
FLTINT Trip Point2.02.73.5V
FLTINT Hysteresis0.75V
INTERNAL POWER FETsOn-ResistanceRDSONVDRVIN = VBST = 9V,
VXFRMRH = VSRC = 0, IDS = 190mA75200mΩ
Off-State Leakage Current10µA
Total Gate Charge Per FETInferred from supply current with
VDS = 50V45nC
HIGH-SIDE DRIVERLow-to-High LatencyDriver delay until FET VGS reaches 0.9 x
(VBST - VXFRMRH)80ns
High-to-Low LatencyDriver delay until FET VGS reaches 0.1 x
(VBST - VXFRMRH)45ns
Output Drive VoltageBST to XFRMRH with high side on8V
LOW-SIDE DRIVERDriver delay until FET VGS reaches
MAX5042/MAX5043Two-Switch Power ICs with Integrated
Power MOSFETs and Hot-Swap Controller
Electrical Characteristics (continued)
(VPOSINPWM = 20V to 76V, VREG15 = 18V, CREG15 = 4.7µF, CREG9 = 1µF, CREG5 = 1µF, RRCOSC = 24kΩ, CRCOSC = 100pF, CBST
= 0.22µF, RDRVDEL = 10kΩ, CDRVDEL = 0.22µF, VCSS = VCSP = VCSN = VRAMP = VPWMNEG = VNEGIN = 0, TA = TMIN to TMAX,
unless otherwise noted. Typical values are at VPOSINPWM = 48V, TA = +25°C, unless otherwise noted. All voltages are referred to
PWMNEG, unless otherwise noted.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSHigh-to-Low LatencyDriver delay until FET VGS reaches
0.1 x VDRVIN45ns
CURRENT-SENSE COMPARATORCurrent-Limit-Comparator
Threshold Voltage140156172mV
Current-Limit-ComparatorPropagation Delay10mV overdrive40ns
CURRENT-SENSE AMPLIFIERCurrent Ampliier GainVCSN = 0, VCSP = 0 to 0.35V9.751010.25V/V
Input Voltage OffsetVCN = VCSP = -0.3V to +0.3V185200230mV
Input Common-Mode Range-0.3+0.3V
Input Differential-Mode RangeInferred from current ampliier gain test0.35V
CSP Input Bias CurrentVCSP = -0.3V to +0.3V, VCSN = 0-160-40µA
CSN Input Bias CurrentVCSP = -0.3V to +0.3V, VCSN = 0-160-30µA
Settling TimeVCSN = 0, VCSP steps from 0 to 0.2V, 10%
settling time, CL = 20pF70ns
3dB Bandwidth7MHz
BOOST VOLTAGE CIRCUITQB RDS(ON)Sinking 100mA1020Ω
Driver Output Delay200ns
One-Shot Pulse Width300ns
THERMAL SHUTDOWNShutdown TemperatureTemperature rising150°C
Thermal Hysteresis14.5°C
PWM CONVERTER UNDERVOLTAGE LOCKOUT (UVLO)Preset UVLO ThresholdMeasured at POSINPWM rising283134V
UVLO Threshold Hysteresis3V
UVLO ResistanceLooking into UVLO3075kΩ
UVLO Trip PointMeasured at UVLO rising1.151.271.39V
UVLO Hysteresis+127mV
Preset DEN ThresholdMAX5043 only, measured at
POSINPWM rising2734V
DEN Threshold HysteresisMAX5043 only3.1V
DEN Startup DelayMAX5043 only3.51227.0ms
DEN Turn-Off DelayMAX5043 only0.20.71.5ms
DEN Trip PointMAX5043 only, rising with respect to
PWMNEG1.111.35V
MAX5042/MAX5043Two-Switch Power ICs with Integrated
Power MOSFETs and Hot-Swap Controller
Electrical Characteristics (continued)
(VPOSINPWM = 20V to 76V, VREG15 = 18V, CREG15 = 4.7µF, CREG9 = 1µF, CREG5 = 1µF, RRCOSC = 24kΩ, CRCOSC = 100pF, CBST
= 0.22µF, RDRVDEL = 10kΩ, CDRVDEL = 0.22µF, VCSS = VCSP = VCSN = VRAMP = VPWMNEG = VNEGIN = 0, TA = TMIN to TMAX,
unless otherwise noted. Typical values are at VPOSINPWM = 48V, TA = +25°C, unless otherwise noted. All voltages are referred to
PWMNEG, unless otherwise noted.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSDEN HysteresisMAX5043 only124mV
DEN Input ResistanceMAX5043 only, looking into DEN1855kΩ
SUPPLY CURRENTSupply Current
From VPOSINHS = VPOSINPWM = 76V,
CSS shorted to PWMNEG, REG15 = 18V23
From REG15 = 18V, VPOSINHS =
VPOSINPWM = 76V, CSS shorted to
PWMNEG8.5
From REG15 = 18V, VPOSINHS =
VPOSINPWM = 76V, VDRNH = VXFRMRH =
VXFRMRL = VSRC = 0V
Standby Supply Current
MAX5042 only, VPOSINHS = VPOSINPWM
= VPWMNEG = VPWMPNEG = VHSDRAIN
= 76V, HSEN = NEGIN
0.61mA
HOT-SWAP CONTROLLER (MAX5042 Only)Hot-Swap UVLO ThresholdPOSINHS with respect to NEGIN,
voltage rising2734V
Hot-Swap UVLO Hysteresis3.1V
Hot-Swap UVLO ResistanceLooking into HSEN1855kΩ
Startup DelayFrom HSEN rising to HSOK falling50165350ms
HSEN Turn-Off DelayFrom HSEN falling to HSOK rising31025ms
HSOK Output-High Leakage
Current±1µA
HSEN Reference ThresholdRising with respect to NEGIN1.111.35V
HSEN Hysteresis124mV
HSOK Output Low VoltageSinking 5mA0.4V
HSGATE Voltage High7.510.0V
Hot-Swap Slew RateCL = 10µF, from HSDRAIN to NEGIN10V/ms
MAX5042/MAX5043Two-Switch Power ICs with Integrated
Power MOSFETs and Hot-Swap Controller
Electrical Characteristics (continued)
(VPOSINPWM = 20V, TA = +25°C, unless otherwise noted.)
HOT-SWAP STARTUP DELAY
vs. TEMPERATUREMAX5042 toc02
TEMPERATURE (°C)
HOT-SWAP STARTUP DELAY (ms)
HOT-SWAP GATE VOLTAGE
vs. INPUT VOLTAGE
MAX5042 toc03
INPUT VOLTAGE (V)
HOT-SWAP GATE VOLTAGE (V)60504030
HOT-SWAP STARTUP WAVEFORM
MAX5042 toc04
VHSGATE
5V/div
10ms/div
VHSDRAIN
20V/div
VHSOK
20V/div100kΩ
PULLUP
PWM UNDERVOLTAGE LOCKOUT
THRESHOLD vs. TEMPERATUREMAX5042 toc05
TEMPERATURE (°C)
PWM UVLO THRESHOLD (V)
VPOSINPWM RISING
VPOSINPWM FALLING
POSINPWM INPUT CURRENT, REG15
INPUT CURRENT vs. TEMPERATUREMAX5042 toc06
SUPPLY CURRENT (mA)
IREG15, VPOSINPWM = 76V
IPOSINPWM, VPOSINPWM = 76V
VREG15 = 18V, CSS = 0,
XFRMRH = 0, NO SWITCHING
HOT-SWAP UNDERVOLTAGE LOCKOUT
THRESHOLD vs. TEMPERATUREMAX5042 toc01
TEMPERATURE (°C)
HOT-SWAP UNDERVOLTAGE LOCKOUT THRESHOLD (V)1007550250-25
VPOSINHS RISING
VPOSINHS FALLING
POSINPWM INPUT CURRENT, REG15
INPUT CURRENT vs. INPUT VOLTAGEMAX5042 toc07
SUPPLY CURRENT (mA)6050403080
IREG15
IPOSINPWM
VREG15 = 18V, CSS = 0,
XFRMRH = 0, NO SWITCHING
OPERATING FREQUENCY
vs. TEMPERATUREMAX5042 toc08
OPERATING FREQUENCY (kHz)
RRCOSC = 25kΩ, CRCOSC = 100pF
RRCOSC = 19kΩ, CRCOSC = 100pF
MAX5042/MAX5043Two-Switch Power ICs with Integrated
Power MOSFETs and Hot-Swap Controller
Typical Operating Characteristics
(VPOSINPWM = 20V, TA = +25°C, unless otherwise noted.)
MAXIMUM DUTY CYCLE
vs. TEMPERATUREMAX5042 toc09
TEMPERATURE (°C)
MAXIMUM DUTY CYCLE (%)
MEASURED AT XFRMRL
REG15 VOLTAGE
vs. REG15 LOAD CURRENTMAX5042 toc10
REG15 LOAD CURRENT (mA)
REG15
(V)4020
REG15 VOLTAGE vs. INPUT VOLTAGE
MAX5042 toc11
INPUT VOLTAGE (V)
REG15
(V)60504030
REG9 VOLTAGE
vs. REG9 LOAD CURRENT
MAX5042 toc12
REG9 LOAD CURRENT (mA)
REG9
(V)2010
VREG15 = 20V
REG9 OUTPUT VOLTAGE
vs. REG15 VOLTAGEMAX5042 toc13
REG15 VOLTAGE (V)
REG9
(V)3025
VPOSINPWM = 48V
REG5 VOLTAGE
vs. REG5 LOAD CURRENTMAX5042 toc14
REG5 LOAD CURRENT (mA)
REG5
(V)1284
VREG15 = 20V
REG5 OUTPUT VOLTAGE
vs. REG15 VOLTAGEMAX5042 toc15
REG5
(V)3025
VPOSINPWM = 48V
SOFT-START CURRENT
vs. TEMPERATUREMAX5042 toc16
SOFT-START CURRENT (µA)
MINIMUM RCFF LEVEL, MINIMUM OPTO
LEVEL vs. TEMPERATURE
MAX5042 toc17
OPTO
, V
RCFF
(V)
VRCFF
VOPTO
IPULLUP INTO OPTO AND
RCFF = 2mA, CSS = 0
MAX5042/MAX5043Two-Switch Power ICs with Integrated
Power MOSFETs and Hot-Swap Controller
Typical Operating Characteristics (continued)
(VPOSINPWM = 20V, TA = +25°C, unless otherwise noted.)
CURRENT-LIMIT THRESHOLD
vs. TEMPERATUREMAX5042 toc18
TEMPERATURE (°C)
CURRENT-LIMIT THRESHOLD (mV)
CURRENT-LIMIT PROPAGATION DELAY
vs. TEMPERATURE
MAX5042 toc19
TEMPERATURE (°C)
CURRENT-LIMIT PROPAGATION DELAY (ns)
MEASURED FROM CSP RISING
TO XFRMRL RISING
CPWM PROPAGATION DELAY
vs. TEMPERATUREMAX5042 toc20
TEMPERATURE (°C)
CPWM PROPAGATION DELAY (ns)
MEASURED FROM RAMP RISING
TO XFRMRL RISING
PPWM TO XFRMRL SKEW
vs. RDRVDELMAX5042 toc21
RDRVDEL (kΩ)
PPWM TO POWER PULSE SKEW (ns)6050403020
MEASURED FROM PPWM RISING
TO XFRMRL FALLING
CSA OFFSET vs. TEMPERATUREMAX5042 toc22
TEMPERATURE (°C)
CSA OFFSET (mV)
FAULT INTEGRATION CURRENT
vs. TEMPERATURE
MAX5042 toc23
TEMPERATURE (°C)
FAULT INTEGRATION CURRENT (µA)
FAULT INTEGRATION SHUTDOWN
VOLTAGE vs. TEMPERATURE
MAX5042 toc24
FAULT INTEGRATION SHUTDOWN VOLTAGE (V)
FAULT INTEGRATION RESTART
VOLTAGE vs. TEMPERATURE
MAX5042 toc25
FAULT INTEGRATION RESTART VOLTAGE (V)
POWER FETs ON-RESISTANCE
vs. TEMPERATURE
MAX5042 toc26
POWER FETs ON-RESISTANCE (
HIGH-SIDE FET
LOW-SIDE FET
MAX5042/MAX5043Two-Switch Power ICs with Integrated
Power MOSFETs and Hot-Swap Controller
Typical Operating Characteristics (continued)
PINNAMEFUNCTIONMAX5042MAX50431, 2, 14, 15,
40, 42–45, 56
1, 2, 14, 15,
40, 42–45, 56N.C.No Connection. Not internally connected.3RCFF
Voltage-Mode PWM Ramp. Connect a resistor to the input supply and a capacitor
to PWMNEG for input voltage feed-forward. Input voltage feed-forward provides
instantaneous input-voltage transient rejection and constant loop gain with varying
input voltage.4RAMP
PWM Ramp Input. For voltage-mode control, connect RAMP to RCFF. For
current- mode control, connect RAMP to CSOUT, the output of the current-sense ampliier.5OPTOInverting Input of the PWM Comparator. Connect OPTO to the collector of the
optotransistor. Connect a pullup resistor from OPTO to REG5.6CSSSoft-Start. Connect a capacitor from CSS to PWMNEG to soft-start the converter.7BSTBoost-Capacitor Bypass for High-Side MOSFET Gate Drive. Connect a 0.1µF
capacitor from BST to XFRMRH for the internal high-side MOSFET driver.8DRVINLow-Side MOSFET Driver Supply. Bypass DRVIN with a 0.22µF capacitor to
PWMPNEG.9PWMPNEGLow-Side MOSFET Driver Return. Connect PWMPNEG externally to PWMNEG
with a short trace.10RCOSC
Oscillator Timing Resistor and Capacitor Connection. Connect a capacitor from
RCOSC to PWMNEG and a resistor from RCOSC to REG5. The switching
frequency is half the frequency of the sawtooth signal at this connection.11FLTINT
Fault Integration Input. Use FLTINT in addition to cycle-by-cycle current limit. During persistent current-limit faults, a capacitor connected to FLTINT charges
with an internal 80µA current source. Switching terminates when the voltage
reaches 2.7V. An external resistor connected in parallel discharges the capacitor.
Switching resumes when the voltage drops to 1.8V.12SYNCSynchronization Input. The switching frequency of the power supply is half the
synchronization frequency, ensuring less than 50% maximum duty cycle.13PWMSD
Latched Shutdown Input. Pull PWMSD low with respect to PWMNEG to stop
switching. To restart, release PWMSD and cycle the input supply. Do not leave
PWMSD unconnected. Use PWMSD to prevent catastrophic secondary rectiier
overheating by monitoring the temperature and issuing a shutdown command with
an optocoupler. Connect PWMSD to REG5 when not used.
16, 17, 20,
21, 24
16, 17, 20,
21, 24SRCSource Connection for the Internal Low-Side Power MOSFET. Connect SRC to
PWMPNEG with a low-value resistor for current limiting.
18, 19, 22, 2318, 19, 22, 23XFRMRLLow-Side Connection for the Isolation Transformer—POSINHSHot-Swap Controller Positive Input Supply (MAX5042 Only). Connect POSINHS
along with POSINPWM to the most positive rail of the input supply.
MAX5042/MAX5043Two-Switch Power ICs with Integrated
Power MOSFETs and Hot-Swap Controller
Pin Description
PINNAMEFUNCTIONMAX5042MAX5043—HSOKHot-Swap OK (MAX5042 Only). HSOK’s open-drain output is forced to NEGIN
upon hot-swap completion.—HSEN
Hot-Swap Enable (MAX5042 Only). HSEN is the center point of the internal hot-swap UVLO divider. Use an external voltage-divider or a 100kΩ pullup resistor to
the most positive rail to override.
28, 29—NEGIN
Negative Supply Input (MAX5042 Only). NEGIN connects to the most negative
input supply rail. NEGIN provides the hot-swap circuit’s most negative connection.
NEGIN is at the same potential as the IC substrate.—HSGATEHot-Swap Gate (MAX5042 Only). Connect HSGATE to the gate of the external
hot- swap MOSFET.—HSDRAINHot-Swap MOSFET Drain Sense (MAX5042 Only). Connect HSDRAIN to the drain
of the external hot-swap MOSFET.32CSOUTCurrent-Sense Ampliier Output. The ampliier has a gain of 10. Connect CSOUT
to RAMP for current-mode control.33CSPPositive Current-Sense Connection. Place the current-sense resistor as close as
possible to the device and use a Kelvin connection.34CSNNegative Current-Sense Connection. Place the current-sense resistor as close as
possible to the device and use a Kelvin connection.26, 28, 29,
31, 35PWMNEGAnalog Signal Return for the PWM Section36DRVDEL
Driver Delay Adjust Connection. Connect a resistor and a 0.22µF capacitor from DRVDEL to PWMNEG. The resistor at DRVDEL controls the skew between the
PPWM signal and the power pulse applied to the internal power MOSFETs. Use in conjunction with a secondary-side synchronous-rectiier controller. The skew allows for the optimization of the synchronous-rectiier drive pulse.37PPWMPWM Pulse Output. PPWM leads the internal power MOSFET pulse by an amount determined with the resistor value at DRVDEL.38REG99V Internal Regulator Output. Use primarily as a source for the internal gate
drivers. Bypass REG9 to PWMNEG with a 1µF ceramic capacitor.39REG55V Internal Regulator Output. Bypass REG5 to PWMNEG with a 1µF ceramic
capacitor.41REG1515V Startup Regulator Output. A voltage greater than 18V on REG15 disables the
regulator. Bypass REG15 to PWMNEG with at least one 1µF ceramic capacitor.46UVLO
PWM Undervoltage Lockout. UVLO is the center point of the PWM undervoltage lockout divider. Use an external divider or a 100kΩ pullup resistor to POSINPWM
to override. Connect the external resistor-divider network from POSINPWM to
PWMNEG.
MAX5042/MAX5043Two-Switch Power ICs with Integrated
Power MOSFETs and Hot-Swap Controller
Pin Description (continued)
