MAX5094AASA+ ,High-Performance, Single-Ended, Current-Mode PWM Controllersfeatures required for wide input-voltage range♦ 2A Drive Source and 1A Sink Capabilityisolated/noni ..
MAX5095AAUA , High-Performance, Single-Ended, Current-Mode PWM Controllers
MAX5098AATJ+ ,Dual, 2.2MHz, Buck or Boost Converter with 80V Load-Dump ProtectionApplications● IndustrialPin Configuration appears at end of data sheet.19-4111; Rev 1; 10/14Downloa ..
MAX509ACAP ,Quad, Serial 8-Bit DACs with Rail-to-Rail OutputsELECTRICAL CHARACTERISTICS(V = +5V ±10%, V = 0V to -5.5V, V = 4V, AGND = DGND = 0V, R = 10kΩ, C = 1 ..
MAX509ACAP+ ,Quad, Serial, 8-Bit DACs with Rail-to-Rail OutputsMAX509/MAX51019-0155; Rev 3; 12/10Quad, Serial 8-Bit DACswith Rail-to-Rail Outputs_______________
MAX509ACPP ,Quad, Serial 8-Bit DACs with Rail-to-Rail OutputsFeaturesThe MAX509/MAX510 are quad, serial-input, 8-bit volt- ' Single +5V or Dual ±5V Supply Opera ..
MAX941CPA ,High-Speed, Low-Power, 3V/5V, Rail-to-Rail Single-Supply ComparatorsFeaturesThe MAX941/MAX942/MAX944 are single/dual/quad' Available in µMAX Packagehigh-speed comparat ..
MAX941CPA+ ,High-Speed, Low-Power, 3V/5V, Rail-to-Rail, Single-Supply ComparatorsApplications 3V or 5V supply. These devices combine high speed, low (Operation Down to 2.7V)power, ..
MAX941CSA ,High-Speed, Low-Power, 3V/5V, Rail-to-Rail Single-Supply ComparatorsMAX941/MAX942/MAX94419-0229; Rev 3; 6/97High-Speed, Low-Power, 3V/5V, Rail-to-Rail Single-Supply Co ..
MAX941CSA ,High-Speed, Low-Power, 3V/5V, Rail-to-Rail Single-Supply ComparatorsApplicationsMAX941CSA 0°C to +70°C 8 SO3V/5V SystemsMAX941C/D 0°C to +70°C Dice*Battery-Powered Sys ..
MAX941CSA ,High-Speed, Low-Power, 3V/5V, Rail-to-Rail Single-Supply ComparatorsELECTRICAL CHARACTERISTICS(V+ = 2.7V to 6.0V, T = T to T , unless otherwise noted. Typical values a ..
MAX941CSA-T ,High-Speed, Low-Power, 3V/5V, Rail-to-Rail, Single-Supply ComparatorsFeaturesThe MAX941/MAX942/MAX944 are single/dual/quad high- ● Available in μMAX Packagespeed compar ..
MAX5094AASA+
High-Performance, Single-Ended, Current-Mode PWM Controllers
General DescriptionThe MAX5094A/B/C/D/MAX5095A/B/C BiCMOS, high-
performance, current-mode PWM controllers have all the
features required for wide input-voltage range
isolated/nonisolatedpower supplies. These controllers
are used for low- and high-power universal input volt-
age and telecom power supplies.
The MAX5094/MAX5095 contain a fast comparator with
only 60ns typical delay from current sense to the output
for overcurrent protection. The MAX5094 has an inte-
grated error amplifier with the output at COMP. Soft-
start is achieved by controlling the COMP voltage rise
using external components.
The oscillator frequency is adjustable from 20kHz to
1MHz with an external resistor and capacitor. The tim-
ing capacitor discharge current is trimmed allowing for
programmable dead time and maximum duty cycle for
a given frequency. The available saw-toothed waveform
at RTCTcan be used for slope compensation when
needed.
The MAX5095A/MAX5095B include a bidirectional syn-
chronization circuit allowing for multiple controllers to
run at the same frequency to avoid beat frequencies.
Synchronization is accomplished by simply connecting
the SYNC of all devices together. When synchronizing
with other devices, the MAX5095A/MAX5095B with the
highest frequency synchronizes the other devices.
Alternatively, the MAX5095A/MAX5095B can be syn-
chronized to an external clock with an open-drain out-
put stage running at a higher frequency.
The MAX5095C provides a clock output pulse
(ADV_CLK) that leads the driver output (OUT) by
110ns. The advanced clock signal is used to drive the
secondary-side synchronous rectifiers.
The MAX5094A/B/C are available in the 8-pin SO and
8-pin µMAX®packages. The MAX5094D and
MAX5095A/B/C are available in the 8-pin µMAXpack-
age. All devices operate over the automotive tempera-
ture range of -40°C to +125°C.
ApplicationsUniversal Input AC/DC Power Supplies
Isolated Telecom Power Supplies
Isolated Power-Supply Modules
Networking Systems
Computer Systems/Servers
Industrial Power Conversion
Isolated Keep-Alive Circuits
FeaturesPin-for-Pin Replacement for UCC28C43
(MAX5094A) and UCC28C45 (MAX5094B)2A Drive Source and 1A Sink CapabilityUp to 1MHz Switching Frequency OperationBidirectional Frequency Synchronization
(MAX5095A/MAX5095B)Advanced Output Drive for Secondary-Side
Synchronous Rectification (MAX5095C)Fast 60ns Cycle-by-Cycle Current LimitTrimmed Oscillator Capacitor Discharge Current
Sets Maximum Duty Cycle AccuratelyAccurate ±5% Start Voltage with 0.8V HysteresisLow 32µA Startup Current5V Regulator Output (REF) with 20mA CapabilityVersions with 0.3V Current-Sense ThresholdOvertemperature Shutdown
MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM ControllersOUT
GNDRT/CT
REF
VCCFB
COMP
μMAX/SO
TOP VIEW
MAX5094
Pin Configurations
Ordering Information19-3864; Rev 3; 10/06
PARTTEMP RANGEPIN-
PACKAGE
PKG
CODE
MAX5094AASA-40°C to +125°C8 SOS8-4
MAX5094AASA+-40°C to +125°C8 SOS8-4
MAX5094AAUA*-40°C to +125°C8 µMAXU8-1
MAX5094AAUA+-40°C to +125°C8 µMAXU8-1
MAX5094BASA*-40°C to +125°C8 SOS8-4
MAX5094BASA+-40°C to +125°C8 SOS8-4
MAX5094BAUA*-40°C to +125°C8 µMAXU8-1
MAX5094BAUA+-40°C to +125°C8 µMAXU8-1
Pin Configurations continued at end of data sheet.µMAX is a registered trademark of Maxim Integrated Products, Inc.
+Denotes lead-free package.
*Future product—contact factory for availability.
Ordering Information continued at end of data sheet.
MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM Controllers
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC= +15V, RT= 10kΩ, CT= 3.3nF, REF = open, CREF= 0.1µF, COMP = open, VFB= 2V, CS = GND, TA
= TJ= -40°C to +85°C,unless otherwise noted.) (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.
VCC(Low-Impedance Source) to GND..................-0.3V to +30V
VCC(ICC< 30mA).....................................................Self Limiting
OUT to GND...............................................-0.3V to (VCC+ 0.3V)
OUT Current.............................................................±1A for 10µs
FB, SYNC, COMP, CS, RT/CT, REF to GND.............-0.3V to +6V
COMP Sink Current (MAX5094)..........................................10mA
Continuous Power Dissipation (TA = +70°C)
8-Pin µMAX (derate 4.5mW/°C above +70°C).............362mW
8-Pin SO (derate 5.9mW/°C above +70°C)...............470.6mW
Operating Temperature Range.........................-40°C to +125°C
Maximum Junction Temperature.....................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
REFERENCEOutput VoltageVREFTA = +25°C, IREF = 1mA4.9505.0005.050V
Line Regulation∆VLINE12V ≤ VCC ≤ 25V, IREF = 1mA0.44mV
Load Regulation∆VLOAD1mA ≤ IREF ≤ 20mA625mV
Total Output VariationVREFT1mA ≤ IREF ≤ 20mA, 12V ≤ VCC ≤ 25V4.95.1V
Reference Output-Noise VoltageVNOISE10Hz ≤ f ≤ 10kHz, TA = +25°C50µV
Reference Output Short CircuitIS_SCVREF = 0V-30-100-180mA
OSCILLATORInitial AccuracyTA = +25°C515457kHz
Voltage Stability12V ≤ VCC ≤ 25V0.20.5%
Temp Stability-40°C ≤ TA ≤ +85°C0.5%
RT/CT Voltage Ramp (P-P)VRAMP1.7V
RT/CT Voltage Ramp ValleyVRAMP_VALLEY1.1V
VRT/CT = 2V, TA = +25°C7.98.38.7Discharge CurrentIDISVRT/CT = 2V, -40°C ≤ TA ≤ +85°C7.58.39.0mA
Frequency RangefOSC201000kHz
ERROR AMPLIFIER (MAX5094)FB Input VoltageVFBFB shorted to COMP2.4652.52.535V
FB Input Bias CurrentIB(FB)-0.01-0.1µA
Open-Loop Voltage GainAVOL2V ≤ VCOMP ≤ 4V100dB
Unity-Gain BandwidthfGBW1MHz
Power-Supply Rejection RatioPSRR12V ≤ VCC ≤ 25V (Note 2)6080dB
COMP Sink CurrentISINKVFB = 2.7V, VCOMP = 1.1V26mA
COMP Source CurrentISOURCEVFB = 2.3V, VCOMP = 5V-0.5-1.2-1.8mA
COMP Output High VoltageVCOMPHVFB = 2.3V, RCOMP = 15kΩ to GND55.8V
COMP Output Low VoltageVCOMPLVFB = 2.7V, RCOMP = 15kΩ to REF0.11.1V
CURRENT-SENSE AMPLIFIER(MAX5094A/MAX5094B)2.8533.26V/VGain (Notes 3, 4)ACS(MAX5094C/D, MAX5095_)2.8533.40V/V
MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM Controllers
ELECTRICAL CHARACTERISTICS (continued)(VCC= +15V, RT= 10kΩ, CT= 3.3nF, REF = open, CREF= 0.1µF, COMP = open, VFB= 2V, CS = GND, TA
= TJ= -40°C to +85°C,unless otherwise noted.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSMAX5094A/B (Note 3)0.9511.05
MAX5094C/MAX5094D (Note 3)0.2750.30.325Maximum Current-Sense SignalVCS_MAX
VCOMP = 5V, MAX50950.2750.30.325
Power-Supply Rejection RatioPSRR12V ≤ VCC ≤ 25V70dB
Input Bias CurrentICSVCOMP = 0V-1-2.5µA
Delay From CS to OUTtCS_DELAY50mV overdrive60ns
MOSFET DRIVEROUT Low-Side On-ResistanceVRDS_ONLISINK = 200mA4.510Ω
OUT High-Side On-ResistanceVRDS_ONHISOURCE = 100mA3.57Ω
ISOURCE (Peak)ISOURCECOUT = 10nF2A
ISINK (Peak)ISINKCOUT = 10nF1A
Rise TimetRCOUT = 1nF15ns
Fall TimetFCOUT = 1nF22ns
UNDERVOLTAGE LOCKOUT/STARTUPStartup Voltage ThresholdVCC_START7.988.408.82V
Minimum Operating Voltage After
Turn-OnVCC_MIN7.17.68.0V
Undervoltage-Lockout HysteresisUVLOHYST0.8V
PWMMAX5094A/MAX5094C/MAX5095A94.59697.5
Maximum Duty CycleDMAXMAX5094B/MAX5094D/MAX5095B/
MAX5095C4849.850%
Minimum Duty CycleDMIN0%
SUPPLY CURRENTStartup Supply CurrentISTARTVCC = 7.5V3265µA
Operating Supply CurrentICCVFB = VCS = 0V35mA
Zener Bias Voltage at VCCVZICC = 25mA2426.5V
THERMAL SHUTDOWNThermal ShutdownTSHDNJunction temperature rising150°C
Thermal Shutdown HysteresisTHYST4°C
SYNCHRONIZATION (MAX5095A/MAX5095B Only) (Note 5)SYNC Frequency RangefSYNC201000kHz
SYNC Clock Input High
ThresholdVSYNCINH3.5V
SYNC Clock Input Low ThresholdVSYNCINL0.8V
SYNC Clock Input Minimum
Pulse WidthtPW_SYNCIN200ns
SYNC Clock Output High LevelVSYNCOH1mA external pulldown4.04.7V
SYNC Clock Output Low LevelVSYNCOLRSYNC = 5kΩ00.1V
SYNC Leakage CurrentISYNCVSYNC = 0V0.010.1µA
MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM Controllers
ELECTRICAL CHARACTERISTICS (continued)(VCC= +15V, RT= 10kΩ, CT= 3.3nF, REF = open, CREF= 0.1µF, COMP = open, VFB= 2V, CS = GND, TA
= TJ= -40°C to +85°C,unless otherwise noted.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
ADV_CLK (MAX5095C Only)ADV_CLK High VoltageVADV_CLKHIADV_CLK = 10mA source2.43V
ADV_CLK Low VoltageVADV_CLKLIADV_CLK = 10mA sink0.4V
ADV_CLK Output Pulse WidthtPULSE85ns
ADV_CLK Rising Edge to OUT
Rising EdgetADV_CLK110ns
ADV_CLK Source and Sink
CurrentIADV_CLK10mA
ELECTRICAL CHARACTERISTICS(VCC= +15V, RT= 10kΩ, CT= 3.3nF, REF = open, CREF= 0.1µF, COMP = open, VFB= 2V, CS = GND, TA
= TJ= -40°C to +125°C,unless otherwise noted.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
REFERENCEOutput VoltageVREFTA = +25°C, IREF = 1mA4.9505.0005.050V
Line Regulation∆VLINE12V ≤ VCC ≤ 25V, IREF = 1mA0.44mV
Load Regulation∆VLOAD1mA ≤ IREF ≤ 20mA625mV
Total Output VariationVREFT1mA ≤ IREF ≤ 20mA, 12V ≤ VCC ≤ 25V4.95.1V
Reference Output-Noise VoltageVNOISE10Hz ≤ f ≤ 10kHz, TA = +25°C50µV
Reference Output Short CircuitIS_SCVREF = 0V-30-100-180mA
OSCILLATORInitial AccuracyTA = +25°C515457kHz
Voltage Stability12V ≤ VCC ≤ 25V0.20.5%
Temp Stability-40°C ≤ TA ≤ +125°C1%
RT/CT Voltage Ramp (P-P)VRAMP1.7V
RT/CT Voltage Ramp ValleyVRAMP_VALLEY1.1V
VRT/CT = 2V, TA = +25°C7.98.38.7Discharge CurrentIDISVRT/CT = 2V, -40°C ≤ TA ≤ +125°C7.58.39.0mA
Frequency RangefOSC201000kHz
ERROR AMPLIFIER (MAX5094)FB Input VoltageVFBFB shorted to COMP2.4652.52.535V
FB Input Bias CurrentIB(FB)-0.01-0.1µA
Open-Loop Voltage GainAVOL2V ≤ VCOMP ≤ 4V100dB
Unity-Gain BandwidthfGBW1MHz
Power-Supply Rejection RatioPSRR12V ≤ VCC ≤ 25V (Note 2)6080dB
COMP Sink CurrentISINKVFB = 2.7V, VCOMP = 1.1V26mA
COMP Source CurrentISOURCEVFB = 2.3V, VCOMP = 5V-0.5-1.2-1.8mA
COMP Output High VoltageVCOMPHVFB = 2.3V, RCOMP =15kΩ to GND55.8V
COMP Output Low VoltageVCOMPLVFB = 2.7V, RCOMP = 15kΩ to REF0.11.1V
MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM Controllers
ELECTRICAL CHARACTERISTICS (continued)(VCC= +15V, RT= 10kΩ, CT= 3.3nF, REF = open, CREF= 0.1µF, COMP = open, VFB= 2V, CS = GND, TA
= TJ= -40°C to +125°C,unless otherwise noted.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
CURRENT-SENSE AMPLIFIERMAX5094A/MAX5094B2.8533.26Gain (Notes 3, 4)ACSMAX5094C/D, MAX5095_2.8533.40V/V
MAX5094A/B (Note 3)0.9511.05
MAX5094C/MAX5094D (Note 3)0.2750.3000.325Maximum Current-Sense SignalVCS_MAX
VCOMP = 5V, MAX5095_0.2750.3000.325
Power-Supply Rejection RatioPSRR12V ≤ VCC ≤ 25V70dB
Input Bias CurrentICSVCOMP = 0V-1-2.5µA
Delay From CS to OUTtCS_DELAY50mV overdrive60ns
MOSFET DRIVEROUT Low-Side On-ResistanceVRDS_ONLISINK = 200mA4.512Ω
OUT High-Side On-ResistanceVRDS_ONHISOURCE = 100mA3.59Ω
ISOURCE (Peak)ISOURCECOUT = 10nF2A
ISINK (Peak)ISINKCOUT = 10nF1A
Rise TimetRCOUT = 1nF15ns
Fall TimetFCOUT = 1nF22ns
UNDERVOLTAGE LOCKOUT/STARTUPStartup Voltage ThresholdVCC_START7.988.48.82V
Minimum Operating Voltage After
Turn-OnVCC_MIN7.17.68.0V
Undervoltage-Lockout HysteresisUVLOHYST0.8V
PWMMAX5094A/MAX5094C/MAX5095A94.59697.5
Maximum Duty CycleDMAXMAX5094B/MAX5094D/MAX5095B/
MAX5095C4849.850%
Minimum Duty CycleDMIN0%
SUPPLY CURRENTStartup Supply CurrentISTARTVCC = 7.5V3265µA
Operating Supply CurrentICCVFB = VCS = 0V35mA
Zener Bias Voltage at VCCVZICC = 25mA2426.5V
THERMAL SHUTDOWNThermal ShutdownTSHDNJunction temperature rising150°C
Thermal Shutdown HysteresisTHYST4°C
SYNCHRONIZATION (MAX5095A/MAX5095B Only) (Note 5)SYNC Frequency RangefSYNC201000kHz
SYNC Clock Input High
ThresholdVSYNCINH3.5V
SYNC Clock Input-Low ThresholdVSYNCINL0.8V
SYNC Clock Input Minimum
Pulse WidthtPW_SYNCIN200ns
MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM Controllers
ELECTRICAL CHARACTERISTICS (continued)(VCC= +15V, RT= 10kΩ, CT= 3.3nF, REF = open, CREF= 0.1µF, COMP = open, VFB= 2V, CS = GND, TA
= TJ= -40°C to +125°C,unless otherwise noted.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSSYNC Clock Output High LevelVSYNCOH1mA external pulldown4.04.7V
SYNC Clock Output Low LevelVSYNCOLRSYNC = 5kΩ00.1V
SYNC Leakage CurrentISYNCVSYNC = 0V0.010.1µA
ADV_CLK (MAX5095C Only)ADV_CLK High VoltageVADV_CLKHIADV_CLK = 10mA source2.43V
ADV_CLK Low VoltageVADV_CLKLIADV_CLK = 10mA sink0.4V
ADV_CLK Output Pulse WidthtPULSE85ns
ADV_CLK Rising Edge to OUT
Rising EdgetADV_CLK110ns
ADV_CLK Source and Sink
CurrentIADV_CLK10mA
Note 1:All devices are 100% tested at +25°C. All limits over temperature are guaranteed by design, not production tested.
Note 2:Guaranteed by design, not production tested.
Note 3:Parameter measured at trip point of latch with VFB= 0 (MAX5094 only).
Note 4:Gain is defined as A = ∆VCOMP / ∆VCS, 0 ≤VCS≤0.8V for MAX5094A/MAX5094B, 0 ≤VCS≤0.2V for
MAX5094C/MAX5094D/ MAX5095_.
Note 5:Output frequency equals oscillator frequency for MAX5094A/MAX5094C/MAX5095A. Output frequency is one-half oscillator
frequency for MAX5094B/MAX5094D/MAX5095B/MAX5095C.
ypical Operating Characteristics(VCC= 15V, TA = +25°C, unless otherwise noted.)
BOOTSTRAP UVLO vs. TEMPERATUREMAX5094/95 toc01
TEMPERATURE (°C)
(V)
VCC RISING
VCC FALLING
HYSTERESIS
STARTUP CURRENT
vs. TEMPERATURE
MAX5094/95 toc02
TEMPERATURE (°C)
ICC
VCC = 7.5V
OPERATING SUPPLY CURRENT
vs. TEMPERATURE AFTER STARTUP
(fOSC = fSW = 300kHz)
MAX5094/95 toc03
ICC
(mA)
TEMPERATURE (°C)
CT = 560pF
MAX5094A/MAX5094C/MAX5095A
MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM Controllers
Typical Operating Characteristics (continued)(VCC= 15V, TA = +25°C, unless otherwise noted.)
REFERENCE VOLTAGE
vs. TEMPERATURE
MAX5094/95 toc04
REF
(V)
TEMPERATURE (°C)
IREF = 1mA
IREF = 20mA
REFERENCE VOLTAGE
vs. REFERENCE LOAD CURRENT
MAX5094/95 toc05
IREF (mA)
REF
(V)
REFERENCE VOLTAGE
vs. SUPPLY VOLTAGE
MAX5094/95 toc06
VCC (V)
REF
(V)
IREF = 1mA
OSCILLATOR FREQUENCY (fOSC)
vs. TEMPERATURE
MAX5094/95 toc07
TEMPERATURE (°C)
OSCILLATOR FREQUENCY (kHz)
RT = 3.65kΩ
CT = 560pF
OSCILLATOR RT/CT DISCHARGE CURRENT
vs. TEMPERATURE
MAX5094/95 toc08
TEMPERATURE (°C)
T DISCHARGE CURRENT (mA)
VRT/CT = 2V
MAXIMUM DUTY CYCLE
vs. TEMPERATURE
MAX5094/95 toc09
DUTY CYCLE (%)
MAX5094A/MAX5094C/MAX5095A
TEMPERATURE (°C)
MAX5094B/MAX5094D/MAX5095B/MAX5095C
RT = 5kΩ
CT = 560pF1000150050020002500300035004000
MAXIMUM DUTY CYCLE vs. FREQUENCY
MAX5094A/MAX5094C/MAX5095AMAX5094/95 toc10
OSCILLATOR FREQUENCY (kHz)
CT = 100pF
CT = 220pFCT = 560pF
CT = 1000pF
DUTY CYCLE (%)
CURRENT-SENSE TRIP THRESHOLD
vs. TEMPERATURE
MAX5094/95 toc11a
CS THRESHOLD (V)
MAX5094A/MAX5094B
TEMPERATURE (°C)
VFB = 0V
CURRENT-SENSE TRIP THRESHOLD
vs. TEMPERATURE
MAX5094/95 toc11b
CS THRESHOLD (V)
TEMPERATURE (°C)
MAX5094C/D: VFB = 0V
MAX5095_: VCOMP = 5V
MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM Controllers
Typical Operating Characteristics (continued)(VCC= 15V, TA = +25°C, unless otherwise noted.)
TIMING RESISTANCE
vs. OSCILLATOR FREQUENCYMAX5094/95 toc12
FREQUENCY (Hz)
(k
1,000,000100,000
10,00010,000,000
CT = 1nF
CT = 560pF
CT = 220pF
CT = 100pF
CT = 10nF
CT = 4.7nF
CT = 3.3nF
CT = 2.2nF
OUT IMPEDANCE vs. TEMPERATURE
(RDS_ON PMOS DRIVER)MAX5094/95 toc13
TEMPERATURE (°C)
DS_ON
ISOURCE = 100mA
OUT IMPEDANCE vs. TEMPERATURE
(RDS_ON NMOS DRIVER)MAX5094/95 toc14
DS_ON
TEMPERATURE (°C)
ISINK = 200mA
PROPAGATION DELAY FROM CURRENT-LIMIT
COMPARATOR TO OUT vs. TEMPERATURE
MAX5094/95 toc15
PROPAGATION DELAY (ns)
TEMPERATURE (°C)
ERROR-AMPLIFIER OPEN-LOOP GAIN
AND PHASE vs. FREQUENCYMAX5094/95 toc16
FREQUENCY (Hz)
GAIN (dB)100k1k10k101001
0.01100M10M
PHASE
GAIN
PHASE (DEGREES)
COMP VOLTAGE LEVEL TO TURN
OFF DEVICE vs. TEMPERATURE
MAX5094/95 toc17
TEMPERATURE (°C)
COMP
(V)
VCC = 15V
ADV_CLK RISING EDGE TO OUT RISING
EDGE TIME vs. TEMPERATURE
MAX5094/95 toc18
TIME (ns)
TEMPERATURE (°C)
MAX5095C
t = 20ns/div
ADV_CLK AND OUT WAVEFORMSOUT
10V/div
ADV_CLK
5V/div
LOAD = 4.75kΩ
MAX5094/95 toc19
VCC = 15V
MAX5095C
MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM Controllers
Typical Operating Characteristics (continued)(VCC= 15V, TA = +25°C, unless otherwise noted.)
Pin Descriptions
PINNAMEFUNCTIONCOMPError-Amplifier Output. COMP can be used for soft-start.FBError-Amplifier Inverting Input
3CSPWM Comparator and Overcurrent Protection Comparator Input. The current-sense signal is
compared to a signal proportional to the error-amplifier output voltage.
4RT/CTTiming Resistor/Capacitor Connection. A resistor RT from RT/CT to REF and capacitor CT from RT/CT
to GND set the oscillator frequency.GNDPower-Supply Ground. Place the VCC and REF bypass capacitors close to the IC to minimize ground
loops.OUTMOSFET Driver Output. OUT connects to the gate of the external n-channel MOSFET.
7VCCPower-Supply Input. Bypass VCC to GND with a 0.1µF ceramic capacitor or a parallel combination of
a 0.1µF and a higher value ceramic capacitor.REF5V Reference Output. Bypass REF to GND with a 0.1µF ceramic capacitor or a parallel combination
of a 0.1µF and a higher value ceramic capacitor no larger then 4.7µF.
MAX5094_t = 400ns/div
OUT SOURCE AND SINK CURRENTSIOUT
4A/div
VOUT
10V/div
MAX5094/95 toc20
VCC = 15V
COUT = 10nF
SUPPLY CURRENT
vs. OSCILLATOR FREQUENCY
MAX5094/95 toc21
FREQUENCY (kHz)
ICC
(mA)
TA = +125°C
MAX5095C
CT = 100pF
TA = -40°C
MAXIMUM DUTY CYCLE
vs. RT MAX5094A/MAX5095AMAX5094/95 toc22
RT (Ω)
DUTY CYCLE (%)
10,0001000
100100,000
CT = 100nF
CT = 560pF
CT = 220pF
CT = 1000pF
MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM Controllers
Pin Descriptions (continued)
PIN
MAX5095A/
MAX5095BMAX5095CNAMEFUNCTION1COMP
Current Limit/PWM Comparator Input. COMP is level-shifted and connected to the
inverting input of the PWM comparator. Pull up COMP to REF through a resistor and
connect an optocoupler from COMP to GND for proper operation.—SYNCBidirectional Synchronization Input. When synchronizing with other
MAX5095A/MAX5095Bs, the higher frequency part synchronizes all other devices.ADV_CLK
Advance Clock Output. ADV_CLK is an 85ns clock output pulse preceding the rising
edge of OUT (see Figure 4). Use the pulse to drive the secondary-side synchronous
rectifiers through a pulse transformer or an optocoupler (see Figure 8).CSPWM Comparator/Overcurrent Protection Comparator Input. The current-sense signal is
compared to the level shifted voltage at COMP.RT/CTTiming Resistor/Capacitor Connection. A resistor RT from RT/CT to REF and capacitor CT
from RT/CT to GND set the oscillator frequency.5GNDPower-Supply Ground. Place the VCC and REF bypass capacitors close to the IC to
minimize ground loops.6OUTMOSFET Driver Output. OUT connects to the gate of the external n-channel MOSFET.VCCPower-Supply Input. Bypass VCC to GND with a 0.1µF ceramic capacitor or a parallel
combination of a 0.1µF and a higher value ceramic capacitor.8REF5V Reference Output. Bypass REF to GND with a 0.1µF ceramic capacitor or a parallel
combination of a 0.1µF and a higher value ceramic capacitor no larger than 4.7µF.
MAX5095_
Detailed DescriptionThe MAX5094_/MAX5095_ current-mode PWM con-
trollers are designed for use as the control and regulation
core of flyback or forward topology switching power sup-
plies. These devices incorporate an integrated low-side
driver, adjustable oscillator, error amplifier (MAX5094_
only), current-sense amplifier, 5V reference, and external
synchronization capability (MAX5095A/MAX5095B only).
An internal +26.5V current-limited VCCclamp prevents
overvoltage during startup.
Eight different versions of the MAX5094/MAX5095 are
available as shown in the Selector Guide. The
MAX5094A/MAX5094B are the standard versions with a
feedback input (FB) and internal error amplifier. The
MAX5095A/MAX5095B include bidirectional synchroniza-
tion (SYNC). This enables multiple MAX5095A/
MAX5095Bs to be connected and synchronized to the
device with the highest frequency. The MAX5095C
includes an ADV_CLK output, which precedes the
MAX5095C’s drive output (OUT) by 110ns. Figures 1, 2,
and 3 show the internal functional diagrams of the
MAX5094_, MAX5095A/MAX5095B, and MAX5095C,
respectively. The MAX5094A/MAX5094C/MAX5095A are
capable of 100% maximum duty cycle. The MAX5094B/
MAX5094D/MAX5095B/MAX5095C limit the maximum
duty cycle to 50%.
MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM ControllersUVLO
REFERENCE
2.5V
PREREGULATOR
VOLTAGE-
DIVIDER
THERMAL
SHUTDOWN
EN-REF
SNS
VDD
5V REGULATOR
VOLTAGE-
DIVIDER
26.5V
VCC
REF
2.5VREG_OKDELAY
OSCQRT/CTOUTILIM
CPWM
1V (MAX5094A/B)
0.3V (MAX5094C/D)
EN-DRV-BAR
VEA
GND
COMP
CLK
MAX5094_
2.5V
8.4V/7.6V
100% MAX DUTY CYCLE (MAX5094A/MAX5094C)
50% MAX DUTY CYCLE (MAX5094B/MAX5094D)
Figure 1. MAX5094_ Functional Diagram
