General Description
The 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/nonisolated power 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 µMAX pack-
age. All devices operate over the automotive tempera-
ture range of -40°C to +125°C.
Applications
Universal 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
Features
♦Pin-for-Pin Replacement for UCC28C43
(MAX5094A) and UCC28C45 (MAX5094B)
♦2A Drive Source and 1A Sink Capability
♦Up to 1MHz Switching Frequency Operation
♦Bidirectional Frequency Synchronization
(MAX5095A/MAX5095B)
♦Advanced Output Drive for Secondary-Side
Synchronous Rectification (MAX5095C)
♦Fast 60ns Cycle-by-Cycle Current Limit
♦Trimmed Oscillator Capacitor Discharge Current
Sets Maximum Duty Cycle Accurately
♦Accurate ±5% Start Voltage with 0.8V Hysteresis
♦Low 32µA Startup Current
♦5V Regulator Output (REF) with 20mA Capability
♦Versions with 0.3V Current-Sense Threshold
♦Overtemperature Shutdown
MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM Controllers
________________________________________________________________ Maxim Integrated Products 1
OUT
GNDRT/CT
1
2
8
7
REF
VCC
FB
CS
COMP
µMAX/SO
TOP VIEW
3
4
6
5
MAX5094
Pin Configurations
Ordering Information
19-3864; Rev 3; 10/06
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
PART TEMP RANGE PIN-
PACKAGE
PKG
CODE
MAX5094AASA
-40°C to +125°C
8 SO S8-4
MAX5094AASA+
-40°C to +125°C
8 SO S8-4
MAX5094AAUA*
-40°C to +125°C
8 µMAX
U8-1
MAX5094AAUA+
-40°C to +125°C
8 µMAX
U8-1
MAX5094BASA*
-40°C to +125°C
8 SO S8-4
MAX5094BASA+
-40°C to +125°C
8 SO S8-4
MAX5094BAUA*
-40°C to +125°C
8 µMAX
U8-1
MAX5094BAUA+
-40°C to +125°C
8 µMAX
U8-1
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
2 _______________________________________________________________________________________
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
PARAMETER SYMBOL CONDITIONS
MIN TYP MAX
UNITS
REFERENCE
Output Voltage VREF TA = +25°C, IREF = 1mA
4.950 5.000 5.050
V
Line Regulation ∆VLINE 12V ≤ VCC ≤ 25V, IREF = 1mA 0.4 4 mV
Load Regulation ∆VLOAD 1mA ≤ IREF ≤ 20mA 6 25 mV
Total Output Variation VREFT 1mA ≤ IREF ≤ 20mA, 12V ≤ VCC ≤ 25V 4.9 5.1 V
Reference Output-Noise Voltage
VNOISE 10Hz ≤ f ≤ 10kHz, TA = +25°C 50 µV
Reference Output Short Circuit IS_SC VREF = 0V -30
-100 -180
mA
OSCILLATOR
Initial Accuracy TA = +25°C 51 54 57 kHz
Voltage Stability 12V ≤ VCC ≤ 25V 0.2 0.5 %
Temp Stability -40°C ≤ TA ≤ +85°C 0.5 %
RT/CT Voltage Ramp (P-P)V
RAMP 1.7 V
RT/CT Voltage Ramp Valley
VRAMP_VALLEY
1.1 V
VRT/CT = 2V, TA = +25°C 7.9 8.3 8.7
Discharge Current IDIS VRT/CT = 2V, -40°C ≤ TA ≤ +85°C 7.5 8.3 9.0 mA
Frequency Range fOSC 20
1000
kHz
ERROR AMPLIFIER (MAX5094)
FB Input Voltage VFB FB shorted to COMP
2.465
2.5
2.535
V
FB Input Bias Current IB(FB)
-0.01 -0.1
µA
Open-Loop Voltage Gain AVOL 2V ≤ VCOMP ≤ 4V
100
dB
Unity-Gain Bandwidth fGBW 1
MHz
Power-Supply Rejection Ratio PSRR 12V ≤ VCC ≤ 25V (Note 2) 60 80 dB
COMP Sink Current ISINK VFB = 2.7V, VCOMP = 1.1V 2 6 mA
COMP Source Current ISOURCE VFB = 2.3V, VCOMP = 5V
-0.5 -1.2 -1.8
mA
COMP Output High Voltage VCOMPH VFB = 2.3V, RCOMP = 15kΩ to GND 5 5.8 V
COMP Output Low Voltage VCOMPL VFB = 2.7V, RCOMP = 15kΩ to REF 0.1 1.1 V
CURRENT-SENSE AMPLIFIER
(MAX5094A/MAX5094B)
2.85
3
3.26
V/V
Gain (Notes 3, 4) ACS (MAX5094C/D, MAX5095_)
2.85
3
3.40
V/V
MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM Controllers
_______________________________________________________________________________________ 3
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)
PARAMETER SYMBOL CONDITIONS
MIN TYP MAX
MAX5094A/B (Note 3)
0.95
1
1.05
MAX5094C/MAX5094D (Note 3)
0.275
0.3
0.325
Maximum Current-Sense Signal VCS_MAX
VCOMP = 5V, MAX5095
0.275
0.3
0.325
V
Power-Supply Rejection Ratio PSRR 12V ≤ VCC ≤ 25V 70 dB
Input Bias Current ICS VCOMP = 0V -1
-2.5
µA
Delay From CS to OUT
tCS_DELAY
50mV overdrive 60 ns
MOSFET DRIVER
OUT Low-Side On-Resistance
VRDS_ONL
ISINK = 200mA 4.5 10 Ω
OUT High-Side On-Resistance
VRDS_ONH
ISOURCE = 100mA 3.5 7 Ω
ISOURCE (Peak) ISOURCE COUT = 10nF 2 A
ISINK (Peak) ISINK COUT = 10nF 1 A
Rise Time tRCOUT = 1nF 15 ns
Fall Time tFCOUT = 1nF 22 ns
UNDERVOLTAGE LOCKOUT/STARTUP
Startup Voltage Threshold
VCC_START 7.98 8.40 8.82
V
Minimum Operating Voltage After
Turn-On VCC_MIN 7.1 7.6 8.0 V
Undervoltage-Lockout Hysteresis
UVLOHYST
0.8 V
PWM
MAX5094A/MAX5094C/MAX5095A
94.5
96
97.5
Maximum Duty Cycle DMAX MAX5094B/MAX5094D/MAX5095B/
MAX5095C 48
49.8
50 %
Minimum Duty Cycle DMIN 0%
SUPPLY CURRENT
Startup Supply Current ISTART VCC = 7.5V 32 65 µA
Operating Supply Current ICC VFB = VCS = 0V 3 5 mA
Zener Bias Voltage at VCC VZICC = 25mA 24
26.5
V
THERMAL SHUTDOWN
Thermal Shutdown TSHDN Junction temperature rising
150
°C
Thermal Shutdown Hysteresis THYST 4°C
SYNCHRONIZATION (MAX5095A/MAX5095B Only) (Note 5)
SYNC Frequency Range fSYNC 20
1000
kHz
SYNC Clock Input High
Threshold VSYNCINH 3.5 V
SYNC Clock Input Low Threshold
VSYNCINL 0.8 V
SYNC Clock Input Minimum
Pulse Width
tPW_SYNCIN 200
ns
SYNC Clock Output High Level VSYNCOH 1mA external pulldown 4.0 4.7 V
SYNC Clock Output Low Level VSYNCOL RSYNC = 5kΩ0 0.1 V
SYNC Leakage Current ISYNC VSYNC = 0V
0.01
0.1 µA
MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM Controllers
4 _______________________________________________________________________________________
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)
PARAMETER SYMBOL CONDITIONS
MIN
TYP
MAX
ADV_CLK (MAX5095C Only)
ADV_CLK High Voltage
VADV_CLKH
IADV_CLK = 10mA source 2.4 3 V
ADV_CLK Low Voltage
VADV_CLKL
IADV_CLK = 10mA sink 0.4 V
ADV_CLK Output Pulse Width tPULSE 85 ns
ADV_CLK Rising Edge to OUT
Rising Edge tADV_CLK
110
ns
ADV_CLK Source and Sink
Current IADV_CLK 10 mA
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)
PARAMETER SYMBOL CONDITIONS
MIN TYP MAX
UNITS
REFERENCE
Output Voltage VREF TA = +25°C, IREF = 1mA
4.950 5.000 5.050
V
Line Regulation ∆VLINE 12V ≤ VCC ≤ 25V, IREF = 1mA 0.4 4 mV
Load Regulation ∆VLOAD 1mA ≤ IREF ≤ 20mA 6 25 mV
Total Output Variation VREFT 1mA ≤ IREF ≤ 20mA, 12V ≤ VCC ≤ 25V 4.9 5.1 V
Reference Output-Noise Voltage
VNOISE 10Hz ≤ f ≤ 10kHz, TA = +25°C 50 µV
Reference Output Short Circuit IS_SC VREF = 0V -30
-100 -180
mA
OSCILLATOR
Initial Accuracy TA = +25°C 51 54 57 kHz
Voltage Stability 12V ≤ VCC ≤ 25V 0.2 0.5 %
Temp Stability -40°C ≤ TA ≤ +125°C 1 %
RT/CT Voltage Ramp (P-P)V
RAMP 1.7 V
RT/CT Voltage Ramp Valley
VRAMP_VALLEY
1.1 V
VRT/CT = 2V, TA = +25°C 7.9 8.3 8.7
Discharge Current IDIS VRT/CT = 2V, -40°C ≤ TA ≤ +125°C 7.5 8.3 9.0 mA
Frequency Range fOSC 20
1000
kHz
ERROR AMPLIFIER (MAX5094)
FB Input Voltage VFB FB shorted to COMP
2.465
2.5
2.535
V
FB Input Bias Current IB(FB)
-0.01 -0.1
µA
Open-Loop Voltage Gain AVOL 2V ≤ VCOMP ≤ 4V
100
dB
Unity-Gain Bandwidth fGBW 1
MHz
Power-Supply Rejection Ratio PSRR 12V ≤ VCC ≤ 25V (Note 2) 60 80 dB
COMP Sink Current ISINK VFB = 2.7V, VCOMP = 1.1V 2 6 mA
COMP Source Current ISOURCE VFB = 2.3V, VCOMP = 5V
-0.5 -1.2 -1.8
mA
COMP Output High Voltage VCOMPH VFB = 2.3V, RCOMP =15kΩ to GND 5 5.8 V
COMP Output Low Voltage VCOMPL VFB = 2.7V, RCOMP = 15kΩ to REF 0.1 1.1 V
MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM Controllers
_______________________________________________________________________________________ 5
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)
PARAMETER SYMBOL CONDITIONS
MIN TYP MAX
UNITS
CURRENT-SENSE AMPLIFIER
MAX5094A/MAX5094B
2.85
3
3.26
Gain (Notes 3, 4) ACS MAX5094C/D, MAX5095_
2.85
3
3.40
V/V
MAX5094A/B (Note 3)
0.95
1
1.05
MAX5094C/MAX5094D (Note 3)
0.275 0.300 0.325
Maximum Current-Sense Signal VCS_MAX
VCOMP = 5V, MAX5095_
0.275 0.300 0.325
V
Power-Supply Rejection Ratio PSRR 12V ≤ VCC ≤ 25V 70 dB
Input Bias Current ICS VCOMP = 0V -1
-2.5
µA
Delay From CS to OUT
tCS_DELAY
50mV overdrive 60 ns
MOSFET DRIVER
OUT Low-Side On-Resistance
VRDS_ONL
ISINK = 200mA 4.5 12 Ω
OUT High-Side On-Resistance
VRDS_ONH
ISOURCE = 100mA 3.5 9 Ω
ISOURCE (Peak) ISOURCE COUT = 10nF 2 A
ISINK (Peak) ISINK COUT = 10nF 1 A
Rise Time tRCOUT = 1nF 15 ns
Fall Time tFCOUT = 1nF 22 ns
UNDERVOLTAGE LOCKOUT/STARTUP
Startup Voltage Threshold
VCC_START 7.98
8.4
8.82
V
Minimum Operating Voltage After
Turn-On VCC_MIN 7.1 7.6 8.0 V
Undervoltage-Lockout Hysteresis
UVLOHYST
0.8 V
PWM
MAX5094A/MAX5094C/MAX5095A
94.5
96
97.5
Maximum Duty Cycle DMAX MAX5094B/MAX5094D/MAX5095B/
MAX5095C 48
49.8
50 %
Minimum Duty Cycle DMIN 0%
SUPPLY CURRENT
Startup Supply Current ISTART VCC = 7.5V 32 65 µA
Operating Supply Current ICC VFB = VCS = 0V 3 5 mA
Zener Bias Voltage at VCC VZICC = 25mA 24
26.5
V
THERMAL SHUTDOWN
Thermal Shutdown TSHDN Junction temperature rising
150
°C
Thermal Shutdown Hysteresis THYST 4°C
SYNCHRONIZATION (MAX5095A/MAX5095B Only) (Note 5)
SYNC Frequency Range fSYNC 20
1000
kHz
SYNC Clock Input High
Threshold
VSYNCINH
3.5 V
SYNC Clock Input-Low Threshold
VSYNCINL 0.8 V
SYNC Clock Input Minimum
Pulse Width
tPW_SYNCIN 200
ns
MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM Controllers
6 _______________________________________________________________________________________
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)
PARAMETER SYMBOL CONDITIONS
MIN TYP MAX
UNITS
SYNC Clock Output High Level VSYNCOH 1mA external pulldown 4.0 4.7 V
SYNC Clock Output Low Level VSYNCOL RSYNC = 5kΩ0 0.1 V
SYNC Leakage Current ISYNC VSYNC = 0V
0.01
0.1 µA
ADV_CLK (MAX5095C Only)
ADV_CLK High Voltage
VADV_CLKH
IADV_CLK = 10mA source 2.4 3 V
ADV_CLK Low Voltage
VADV_CLKL
IADV_CLK = 10mA sink 0.4 V
ADV_CLK Output Pulse Width tPULSE 85 ns
ADV_CLK Rising Edge to OUT
Rising Edge tADV_CLK
110
ns
ADV_CLK Source and Sink
Current IADV_CLK 10 mA
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.
Typical Operating Characteristics
(VCC = 15V, TA = +25°C, unless otherwise noted.)
BOOTSTRAP UVLO vs. TEMPERATURE
MAX5094/95 toc01
TEMPERATURE (°C)
VCC (V)
1109565 80-10 520 35 50-25
0
1
2
3
4
5
6
7
8
9
10
-40 125
VCC RISING
VCC FALLING
HYSTERESIS
25
27
39
31
29
33
35
37
41
-40 -10 5 20-25 35 50 9580 11065 125
STARTUP CURRENT
vs. TEMPERATURE
MAX5094/95 toc02
TEMPERATURE (°C)
ICC (µA)
VCC = 7.5V
3.5
3.7
4.9
4.1
3.9
4.3
4.5
4.7
5.1
OPERATING SUPPLY CURRENT
vs. TEMPERATURE AFTER STARTUP
(fOSC = fSW = 300kHz)
MAX5094/95 toc03
ICC (mA)
-40 -10 5 20-25 35 50 9580 11065 125
TEMPERATURE (°C)
CT = 560pF
MAX5094A/MAX5094C/MAX5095A
MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM Controllers
_______________________________________________________________________________________ 7
Typical Operating Characteristics (continued)
(VCC = 15V, TA = +25°C, unless otherwise noted.)
4.90
4.94
4.92
5.00
4.98
4.96
5.02
5.04
5.06
5.08
REFERENCE VOLTAGE
vs. TEMPERATURE
MAX5094/95 toc04
VREF (V)
-40 -10 5 20-25 35 50 9580 11065 125
TEMPERATURE (°C)
IREF = 1mA
IREF = 20mA
4.65
4.75
4.70
4.85
4.80
5.00
4.95
4.90
5.05
02010 30 40 50 60 70
REFERENCE VOLTAGE
vs. REFERENCE LOAD CURRENT
MAX5094/95 toc05
IREF (mA)
VREF (V)
4.980
4.984
4.982
4.988
4.986
4.992
4.990
4.994
4.998
4.996
5.000
10 14 1612 18 20 22 24 26
REFERENCE VOLTAGE
vs. SUPPLY VOLTAGE
MAX5094/95 toc06
VCC (V)
VREF (V)
IREF = 1mA
450
470
460
500
490
480
510
520
540
530
550
-40 -10 5-25 20 35 50 65 80 95 110 125
OSCILLATOR FREQUENCY (fOSC)
vs. TEMPERATURE
MAX5094/95 toc07
TEMPERATURE (°C)
OSCILLATOR FREQUENCY (kHz)
RT = 3.65kΩ
CT = 560pF
7.88
7.90
8.02
7.94
7.92
7.96
7.98
8.00
8.04
-40 -10 5 20-25 35 50 9580 11065 125
OSCILLATOR RT/CT DISCHARGE CURRENT
vs. TEMPERATURE
MAX5094/95 toc08
TEMPERATURE (°C)
RT/CT DISCHARGE CURRENT (mA)
VRT/CT = 2V
0
20
10
50
40
30
60
70
90
80
100
MAXIMUM DUTY CYCLE
vs. TEMPERATURE
MAX5094/95 toc09
DUTY CYCLE (%)
MAX5094A/MAX5094C/MAX5095A
-40 -10 5 20-25 35 50 9580 11065 125
TEMPERATURE (°C)
MAX5094B/MAX5094D/MAX5095B/MAX5095C
RT = 5kΩ
CT = 560pF
0 1000 1500500 2000 2500 3000 3500 4000
MAXIMUM DUTY CYCLE vs. FREQUENCY
MAX5094A/MAX5094C/MAX5095A
MAX5094/95 toc10
OSCILLATOR FREQUENCY (kHz)
CT = 100pF
CT = 220pF
CT = 560pF
CT = 1000pF
0
20
10
50
40
30
60
70
90
80
100
DUTY CYCLE (%)
0.90
0.94
0.92
1.00
0.98
0.96
1.02
1.04
1.08
1.06
1.10
CURRENT-SENSE TRIP THRESHOLD
vs. TEMPERATURE
MAX5094/95 toc11a
CS THRESHOLD (V)
MAX5094A/MAX5094B
-40 -10 5 20-25 35 50 9580 11065 125
TEMPERATURE (°C)
VFB = 0V
0.20
0.24
0.22
0.30
0.28
0.26
0.32
0.34
0.38
0.36
0.40
CURRENT-SENSE TRIP THRESHOLD
vs. TEMPERATURE
MAX5094/95 toc11b
CS THRESHOLD (V)
-40 -10 5 20-25 35 50 9580 11065 125
TEMPERATURE (°C)
MAX5094C/D: VFB = 0V
MAX5095_: VCOMP = 5V
MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM Controllers
8 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(VCC = 15V, TA = +25°C, unless otherwise noted.)
TIMING RESISTANCE
vs. OSCILLATOR FREQUENCY
MAX5094/95 toc12
FREQUENCY (Hz)
RT (kΩ)
1,000,000100,000
1
10
100
1000
0.1
10,000 10,000,000
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)
RDS_ON (Ω)
1109565 80-10 5 20 35 50-25
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
4.0
4.2
4.4
4.6
4.8
5.0
2.0
-40 125
ISOURCE = 100mA
0
2
1
5
4
3
6
7
9
8
10
OUT IMPEDANCE vs. TEMPERATURE
(RDS_ON NMOS DRIVER)
MAX5094/95 toc14
RDS_ON (Ω)
-40 -10 5 20-25 35 50 9580 11065 125
TEMPERATURE (°C)
ISINK = 200mA
0
20
10
50
40
30
60
70
90
80
100
PROPAGATION DELAY FROM CURRENT-LIMIT
COMPARATOR TO OUT vs. TEMPERATURE
MAX5094/95 toc15
PROPAGATION DELAY (ns)
-40 -10 5 20-25 35 50 9580 11065 125
TEMPERATURE (°C)
ERROR-AMPLIFIER OPEN-LOOP GAIN
AND PHASE vs. FREQUENCY
MAX5094/95 toc16
FREQUENCY (Hz)
GAIN (dB)
1M100k1k 10k10 1001
0
20
40
60
80
100
120
140
-20
0.01 100M
10M
-165
-140
-115
-90
-65
-40
-15
10
-190
PHASE
GAIN
PHASE (DEGREES)
1.5
1.6
2.2
1.8
1.7
1.9
2.0
2.1
2.3
-40 -10 5 20-25 35 50 9580 11065 125
COMP VOLTAGE LEVEL TO TURN
OFF DEVICE vs. TEMPERATURE
MAX5094/95 toc17
TEMPERATURE (°C)
VCOMP (V)
VCC = 15V
100
104
102
110
108
106
112
114
118
116
120
ADV_CLK RISING EDGE TO OUT RISING
EDGE TIME vs. TEMPERATURE
MAX5094/95 toc18
TIME (ns)
-40 -10 5 20-25 35 50 9580 11065 125
TEMPERATURE (°C)
MAX5095C
t = 20ns/div
ADV_CLK AND OUT WAVEFORMS
OUT
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
_______________________________________________________________________________________ 9
Typical Operating Characteristics (continued)
(VCC = 15V, TA = +25°C, unless otherwise noted.)
Pin Descriptions
PIN NAME FUNCTION
1 COMP Error-Amplifier Output. COMP can be used for soft-start.
2 FB Error-Amplifier Inverting Input
3CS
PWM Comparator and Overcurrent Protection Comparator Input. The current-sense signal is
compared to a signal proportional to the error-amplifier output voltage.
4R
T/CTTiming Resistor/Capacitor Connection. A resistor RT from RT/CT to REF and capacitor CT from RT/CT
to GND set the oscillator frequency.
5 GND Power-Supply Ground. Place the VCC and REF bypass capacitors close to the IC to minimize ground
loops.
6 OUT MOSFET Driver Output. OUT connects to the gate of the external n-channel MOSFET.
7V
CC Power-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.
8 REF 5V 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 CURRENTS
IOUT
4A/div
VOUT
10V/div
MAX5094/95 toc20
VCC = 15V
COUT = 10nF
2.0
3.0
2.5
4.0
3.5
5.0
4.5
5.5
6.5
6.0
7.0
20 220 320 420120 520 620 720 920820 1020
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/MAX5095A
MAX5094/95 toc22
RT (Ω)
DUTY CYCLE (%)
10,0001000
30
40
50
60
70
80
90
100
20
100 100,000
CT = 100nF
CT = 560pF
CT = 220pF
CT = 1000pF
MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM Controllers
10 ______________________________________________________________________________________
Pin Descriptions (continued)
PIN
MAX5095A/
MAX5095B
MAX5095C
NAME FUNCTION
1 1 COMP
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.
2 — SYNC Bidirectional Synchronization Input. When synchronizing with other
MAX5095A/MAX5095Bs, the higher frequency part synchronizes all other devices.
—2
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).
33CS
PWM Comparator/Overcurrent Protection Comparator Input. The current-sense signal is
compared to the level shifted voltage at COMP.
44R
T/CTTiming Resistor/Capacitor Connection. A resistor RT from RT/CT to REF and capacitor CT
from RT/CT to GND set the oscillator frequency.
5 5 GND Power-Supply Ground. Place the VCC and REF bypass capacitors close to the IC to
minimize ground loops.
6 6 OUT MOSFET Driver Output. OUT connects to the gate of the external n-channel MOSFET.
77V
CC Power-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.
8 8 REF 5V 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 Description
The 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 VCC clamp 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 Controllers
______________________________________________________________________________________ 11
UVLO
REFERENCE
2.5V
PREREGULATOR
5V
VOLTAGE-
DIVIDER
THERMAL
SHUTDOWN
EN-REF
BG
SNS
VDD
5V REGULATOR
VOLTAGE-
DIVIDER
8
7
26.5V
VCC
REF
2.5V
VP
REG_OK
DELAY
S
R
Q
OSC Q
4RT/CT
6OUT
ILIM
CPWM
1V (MAX5094A/B)
0.3V (MAX5094C/D)
EN-DRV-BAR
R
2R
VEA
3
5
2
1
CS
GND
FB
COMP
CLK
MAX5094_
VP
2.5V
8.4V/7.6V
100% MAX DUTY CYCLE (MAX5094A/MAX5094C)
50% MAX DUTY CYCLE (MAX5094B/MAX5094D)
Figure 1. MAX5094_ Functional Diagram
MAX5094A/B/C/D/MAX5095A/B/C
Current-Mode Control Loop
The advantages of current-mode control over voltage-
mode control are twofold. First, there is the feed-forward
characteristic brought on by the controller’s ability to
adjust for variations in the input voltage on a cycle-by-
cycle basis. Secondly, the stability requirements of the
current-mode controller are reduced to that of a single-
pole system unlike the double pole in the voltage-mode
control scheme.
The MAX5094/MAX5095 use a current-mode control loop
where the output of the error amplifier is compared to the
current-sense voltage (VCS). When the current-sense sig-
nal is lower than the inverting input of the CPWM com-
parator, the output of the comparator is low and the
switch is turned on at each clock pulse. When the cur-
rent-sense signal is higher than the inverting input of the
CPWM comparator, the output is high and the switch is
turned off.
High-Performance, Single-Ended, Current-Mode
PWM Controllers
12 ______________________________________________________________________________________
UVLO
REFERENCE
2.5V
PREREGULATOR
5V
VOLTAGE-
DIVIDER
THERMAL
SHUTDOWN
EN-REF
BG
SNS
VDD
5V REGULATOR
VOLTAGE-
DIVIDER
8
7
26.5V
VCC
REF
2.5V
VP
REG_OK
DELAY
S
R
Q
OSC Q
4RT/CT
6OUT
ILIM
CPWM
0.3V
EN-DRV-BAR
R
2R
3
5
1
2
CS
GND
COMP
SYNC
CLK
MAX5095A
MAX5095B
VP
2.5V
BIDIRECTIONAL
SYNC
100% MAX DUTY CYCLE (MAX5095A)
50% MAX DUTY CYCLE (MAX5095B)
8.4V/7.6V
Figure 2. MAX5095A/B Functional Diagram
VCC and Startup
In normal operation, VCC is derived from a tertiary wind-
ing of the transformer. However, at startup there is no
energy delivered through the transformer, thus a resistor
must be connected from VCC to the input power source
(see RST and CST in Figures 5 to 8). During startup, CST
charges up through RST. The 5V reference generator,
comparator, error amplifier, oscillator, and drive circuit
remain off during UVLO to reduce startup current below
65µA. When VCC reaches the undervoltage-lockout
threshold of 8.4V, the output driver begins to switch and
the tertiary winding supplies power to VCC. VCC has an
internal 26.5V current-limited clamp at its input to protect
the device from overvoltage during startup.
Size the startup resistor, RST, to supply both the maxi-
mum startup bias (ISTART) of the device (65µA max)
and the charging current for CST. The startup capacitor
CST must charge to 8.4V within the desired time period
tST (for example, 500ms). The size of the startup
capacitor depends on:
1) IC operating supply current at a programmed oscilla-
tor frequency (fOSC).
2) The time required for the bias voltage, derived from
a bias winding, to go from 0 to 9V.
3) The MOSFET total gate charge.
4) The operating frequency of the converter (fSW).
MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM Controllers
______________________________________________________________________________________ 13
UVLO
REFERENCE
2.5V
PREREGULATOR
5V
VOLTAGE-
DIVIDER
THERMAL
SHUTDOWN
EN-REF
BG
SNS
VDD
5V REGULATOR
VOLTAGE-
DIVIDER
8
7
26.5V
VCC
REF
2.5V
VP
REG_OK
DELAY
S
R
Q
OSC Q
4RT/CT
6OUT
ILIM
CPWM
0.3V
EN-DRV-BAR
R
2R
3
5
1
2
CS
GND
COMP
ADV_CLK
CLK
MAX5095C
VP
2.5V
50% MAX DUTY CYCLE
8.4V/7.6V
Figure 3. MAX5095C Functional Diagram
MAX5094A/B/C/D/MAX5095A/B/C
To calculate the capacitance required, use the following
formula:
where:
IG= QGfSW
ICC is the MAX5094/MAX5095s’ maximum internal sup-
ply current after startup (see the Typical Operating
Characteristics to find the IIN at a given fOSC). QG is the
total gate charge for the MOSFET, fSW is the converter
switching frequency, VHYST is the bootstrap UVLO hys-
teresis (0.8V), and tSS is the soft-start time, which is set
by external circuitry.
Size the resistor RST according to the desired startup
time period, tST, for the calculated CST. Use the follow-
ing equations to calculate the average charging current
(ICST) and the startup resistor (RST):
Where VINMIN is the minimum input supply voltage for
the application (36V for telecom), VSUVR is the bootstrap
UVLO wake-up level (8.4V), and ISTART is the VIN supply
current at startup (65µA, max). Choose a higher value for
RST than the one calculated above if longer startup times
can be tolerated to minimize power loss in RST.
The equation for CST above gives a good approximation
of CST, yet neglects the current through RST. Fine tune
CST using:
The above startup method is applicable to circuits where
the tertiary winding has the same phase as the output
windings. Thus, the voltage on the tertiary winding at any
given time is proportional to the output voltage and goes
through the same soft-start period as the output voltage.
The minimum discharge time of CST from 8.4V to 7.6V
must be greater than the soft-start time (tSS).
Undervoltage Lockout (UVLO)
The minimum turn-on supply voltage for the
MAX5094/MAX5095 is 8.4V. Once VCC reaches 8.4V,
the reference powers up. There is 0.8V of hysteresis
from the minimum turn-on voltage to the UVLO thresh-
old. Once VCC reaches 8.4V, the MAX5094/MAX5095
operates with VCC down to 7.6V. Once VCC goes below
7.6V the device is in UVLO. When in UVLO, the quies-
cent supply current into VCC falls back to 32µA (typ),
and OUT and REF are pulled low.
MOSFET Driver
OUT drives an external n-channel MOSFET and swings
from GND to VCC. Ensure that VCC remains below the
absolute maximum VGS rating of the external MOSFET.
OUT is a push-pull output with the on-resistance of the
PMOS typically 3.5Ωand the on-resistance of the NMOS
typically 4.5Ω. The driver can source 2A typically and
sink 1A typically. This allows for the MAX5094/MAX5095
to quickly turn on and off high gate-charge MOSFETs.
Bypass VCC with one or more 0.1µF ceramic capacitors
to GND, placed close to the MAX5094/MAX5095. The
average current sourced to drive the external MOSFET
depends on the total gate charge (QG) and operating
frequency of the converter. The power dissipation in the
MAX5094/MAX5095 is a function of the average output-
drive current (IDRIVE). Use the following equation to cal-
culate the power dissipation in the device due to IDRIVE:
IDRIVE = QGx fSW
PD = (IDRIVE + ICC) x VCC
where, ICC is the operating supply current. See the
Typical Operating Characteristics for the operating
supply current at a given frequency.
Error Amplifier (MAX5094)
The MAX5094 includes an internal error amplifier. The
inverting input is at FB and the noninverting input is inter-
nally connected to a 2.5V reference. The internal error
amplifier is useful for nonisolated converter design (see
Figure 6) and isolated design with primary-side regulation
through a bias winding (see Figure 5). In the case of a
nonisolated power supply, the output voltage is:
where, R1 and R2 are from Figure 6.
VR
RV
OUT =+
⎛
⎝
⎜⎞
⎠
⎟×11
225.
C
IIVV
R
Vt
ST
CC G INMIN
ST
HYST SS
=
+− −
⎛
⎝
⎜⎞
⎠
⎟
⎡
⎣
⎢
⎢
⎢
⎢
⎢
⎤
⎦
⎥
⎥
⎥
⎥
⎥
8
()
R
VV
II
ST
INMIN SUVR
CST START
≅
−
⎛
⎝
⎜⎞
⎠
⎟
+
2
IVC
t
CST SUVR ST
ST
=×
CIIt
V
ST CC G SS
HYST
=+
[]
()
High-Performance, Single-Ended, Current-Mode
PWM Controllers
14 ______________________________________________________________________________________
MAX5095_Feedback
The MAX5095A/MAX5095B/MAX5095C use either an
external error amplifier when designed into a nonisolat-
ed converter or an error amplifier and optocoupler
when designed into an isolated power supply. The
COMP input is level-shifted and connected to the
inverting terminal of the PWM comparator (CPWM).
Connect the COMP input to the output of the external
error amplifier for nonisolated design. Pull COMP high
externally to 5V (or REF) and connect the optocoupler
transistor as shown in Figures 7 and 8. COMP can be
used for soft-start and also as a shutdown. See the
Typical Operating Characteristics to find the turn-off
COMP voltage at different temperatures.
Oscillator
The oscillator frequency is programmed by adding an
external capacitor and resistor at RT/CT(see RTand CT
in the Typical Application Circuits). RTis connected
from RT/CTto the 5V reference (REF) and CTis con-
nected from RT/CTto GND. REF charges CTthrough RT
until its voltage reaches 2.8V. CTthen discharges
through an 8.3mA internal current sink until CT’s voltage
reaches 1.1V, at which time CTis allowed to charge
through RTagain. The oscillator’s period will be the
sum of the charge and discharge times of CT. Calculate
the charge time as
tC= 0.57 x RTx CT
The discharge time is then
The oscillator frequency will then be
For the MAX5094A/MAX5094C/MAX5095A, the convert-
er output switching frequency (fSW) is the same as the
oscillator frequency (fOSC). For the MAX5094B/
MAX5094D/MAX5095B/MAX5095C, the output switch-
ing frequency is 1/2 the oscillator frequency.
Reference Output
REF is a 5V reference output that can source 20mA.
Bypass REF to GND with a 0.1µF capacitor.
Current Limit
The MAX5094/MAX5095 include a fast current-limit com-
parator to terminate the ON cycle during an overload or a
fault condition. The current-sense resistor (RCS), connect-
ed between the source of the MOSFET and GND, sets
the current limit. The CS input has a voltage trip level
(VCS) of 1V (MAX5094A/B) or 0.3V (MAX5094C/D,
MAX5095_). Use the following equation to calculate RCS:
IP-P is the peak current in the primary that flows through
the MOSFET. When the voltage produced by this current
(through the current-sense resistor) exceeds the current-
limit comparator threshold, the MOSFET driver (OUT) will
turn the switch off within 60ns. In most cases, a small RC
filter is required to filter out the leading-edge spike on the
sense waveform. Set the time constant of the RC filter at
50ns. Use a current transformer to limit the losses in the
current-sense resistor and achieve higher efficiency
especially at low input-voltage operation.
Synchronization (MAX5095A/MAX5095B)
SYNC
SYNC is a bidirectional input/output that outputs a syn-
chronizing pulse and accepts a synchronizing pulse
from other MAX5095A/MAX5095Bs (see Figures 7 and
9). As an output, SYNC is an open-drain p-channel
MOSFET driven from the internal oscillator and requires
an external pulldown resistor (RSYNC) between 500Ω
and 5kΩ. As an input, SYNC accepts the output pulses
from other MAX5095A/MAX5095Bs.
Synchronize multiple MAX5095A/MAX5095Bs by con-
necting their SYNC pins together. All devices connected
together will synchronize to the one operating at the
highest frequency. The rising edge of SYNC will precede
the rising edge of OUT by approximately the discharge
time (tD) of the oscillator (see the Oscillator section). The
pulse width of the SYNC output is equal to the time
required to discharge the stray capacitance at SYNC
through RSYNC plus the CTdischarge time tD. Adjust
RT/CTsuch that the minimum discharge time tDis 200ns.
RV
I
CS CS
PP
=−
ftt
OSC CD
=+
1
tRC
R
DTT
T
=××
×−×
10
488 18 10
3
3
..
MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM Controllers
______________________________________________________________________________________ 15
MAX5094A/B/C/D/MAX5095A/B/C
Advance Clock Output (ADV_CLK) (MAX5095C)
ADV_CLK is an advanced pulse output provided to
facilitate the easy implementation of secondary-side
synchronous rectification using the MAX5095C. The
ADV_CLK pulse width is 85ns (typically) with its rising
edge leading the rising edge of OUT by 110ns. Use
this leading pulse to turn off the secondary-side syn-
chronous-rectifier MOSFET (QS) before the voltage
appears on the secondary (see Figure 8). Turning off
the secondary-side synchronous MOSFET earlier
avoids the shorting of the secondary in the forward
converter. The ADV_CLK pulse can be propagated to
the secondary side using a pulse transformer or high-
speed optocoupler. The 85ns pulse, with 3V drive volt-
age (10mA source), significantly reduces the
volt-second requirement of the pulse transformer and
the advanced pulse alleviates the need for a high-
speed optocoupler.
Thermal Shutdown
When the MAX5094/MAX5095’s die temperature goes
above +150°C, the thermal shutdown circuitry will shut
down the 5V reference and pull OUT low.
High-Performance, Single-Ended, Current-Mode
PWM Controllers
16 ______________________________________________________________________________________
tADV_CLK = 110ns
tPULSE = 85ns
OUT
ADV_CLK
RT/CT
Figure 4. ADV_CLK
Typical Application Circuits
RT
R1
R2
1
2
4
3
REF
VCC
GND
OUT
COMP
FB
RT/CT
CS
8
7
5
6
MAX5094_
CT
RST
VIN
CST VOUT
N
RCS
Figure 5. MAX5094_ Typical Application Circuit (Isolated Flyback with Primary-Side Regulation)
MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM Controllers
______________________________________________________________________________________ 17
Typical Application Circuits (continued)
RT
R1
R2
1
2
4
3
REF
VCC
GND
OUT
COMP
FB
RT/CT
CS
8
7
5
6
MAX5094_
CT
RST
VIN
CST
RCS
VOUT
N
Figure 6. MAX5094_ Typical Application Circuit (Nonisolated Flyback)
RT
1
2
4
3
REF
VCC
GND
OUT
COMP
SYNC
RT/CT
CS
8
7
5
6
MAX5095A
MAX5095B
CT
RST
VIN
CST VOUT
SYNC
INPUT/OUTPUT
N
RSYNC
RCS
Figure 7. MAX5095A/MAX5095B Typical Application Circuit (Isolated Flyback)
MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM Controllers
18 ______________________________________________________________________________________
Typical Application Circuits (continued)
MAX5095C
VCC
GND
COMP
RT/CT
REF
CS
OUT
RT
CT
VIN
ADV_CLK
CST
RST
0.5V/µs PULSE TRANSFORMER
MAX5078
VD
QR
N
N
N
QS
VOUT
VD
RCS
Figure 8. MAX5095C Typical Application Circuit (Isolated Forward with Secondary-Side Synchronous Rectification)
MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM Controllers
______________________________________________________________________________________ 19
MAX5095A
MAX5095B
VCC
GND
SYNC
RT/CT
REF
CS
OUT
RT
CT
VIN
MAX5095A
MAX5095B
VCC
GND
SYNC
RT/CT
REF
CS
OUT
RT
CT
VIN
MAX5095A
MAX5095B
VCC
GND
SYNC
RT/CT
REF
CS
OUT
RT
CT
VIN
TO OTHER
MAX5095A/Bs
RSYNC
NN N
Figure 9. Synchronization of MAX5095A/MAX5095B
MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM Controllers
20 ______________________________________________________________________________________
Chip Information
TRANSISTOR COUNT: 1987
PROCESS: BiCMOS
OUT
GNDRT/CT
1
2
8
7
REF
VCC
SYNC
CS
COMP
µMAX
TOP VIEW
3
4
6
5
MAX5095A
MAX5095B OUT
GNDRT/CT
1
2
8
7
REF
VCC
ADV_CLK
CS
COMP
µMAX
3
4
6
5
MAX5095C
Pin Configurations (continued)
Selector Guide
PART FEATURE
UVLO
THRESHOLD
(V)
CS
THRESHOLD
(V)
MAX DUTY
CYCLE
(%)
COMPETITORS PART
NUMBER
PIN-
PACKAGE
MAX5094AASA Feedback 8.4 1 100
UCC28C43 2nd source
8 SO
MAX5094AAUA Feedback 8.4 1 100
UCC28C43 2nd source
8 µMAX
MAX5094BASA Feedback 8.4 1 50
UCC28C45 2nd source
8 SO
MAX5094BAUA Feedback 8.4 1 50
UCC28C45 2nd source
8 µMAX
MAX5094CASA Feedback 8.4 0.3 100 Improved UCC28C43 8 SO
MAX5094CAUA Feedback 8.4 0.3 100 Improved UCC28C43 8 µMAX
MAX5094DAUA Feedback 8.4 0.3 50 Improved UCC28C45 8 µMAX
MAX5095AAUA Sync 8.4 0.3 100 Improved UCC28C43 8 µMAX
MAX5095BAUA Sync 8.4 0.3 50 Improved UCC28C45 8 µMAX
MAX5095CAUA ADV_CLK 8.4 0.3 50 Improved UCC28C45 8 µMAX
Ordering Information (continued)
PART TEMP RANGE PIN-
PACKAGE
PKG
CODE
MAX5094CASA*
-40°C to +125°C
8 SO S8-4
MAX5094CASA+
-40°C to +125°C
8 SO S8-4
MAX5094CAUA*
-40°C to +125°C
8 µMAX
U8-1
MAX5094CAUA+
-40°C to +125°C
8 µMAX
U8-1
MAX5094DAUA*
-40°C to +125°C
8 µMAX
U8-1
MAX5094DAUA+
-40°C to +125°C
8 µMAX
U8-1
MAX5095AAUA
-40°C to +125°C
8 µMAX
U8-1
MAX5095AAUA+*
-40°C to +125°C
8 µMAX
U8-1
MAX5095BAUA*
-40°C to +125°C
8 µMAX
U8-1
MAX5095BAUA+
-40°C to +125°C
8 µMAX
U8-1
MAX5095CAUA*
-40°C to +125°C
8 µMAX
U8-1
MAX5095CAUA+
-40°C to +125°C
8 µMAX
U8-1
+Denotes lead-free package.
*Future product—contact factory for availability.
MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM Controllers
______________________________________________________________________________________ 21
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
SOICN .EPS
PACKAGE OUTLINE, .150" SOIC
1
1
21-0041 B
REV.DOCUMENT CONTROL NO.APPROVAL
PROPRIETARY INFORMATION
TITLE:
TOP VIEW
FRONT VIEW
MAX
0.010
0.069
0.019
0.157
0.010
INCHES
0.150
0.007
E
C
DIM
0.014
0.004
B
A1
MIN
0.053A
0.19
3.80 4.00
0.25
MILLIMETERS
0.10
0.35
1.35
MIN
0.49
0.25
MAX
1.75
0.050
0.016L0.40 1.27
0.3940.386D
D
MINDIM
D
INCHES
MAX
9.80 10.00
MILLIMETERS
MIN MAX
16 AC
0.337 0.344 AB8.758.55 14
0.189 0.197 AA5.004.80 8
N MS012
N
SIDE VIEW
H 0.2440.228 5.80 6.20
e 0.050 BSC 1.27 BSC
C
HE
eBA1
A
D
0∞-8∞
L
1
VARIATIONS:
MAX5094A/B/C/D/MAX5095A/B/C
High-Performance, Single-Ended, Current-Mode
PWM Controllers
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
22 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2006 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
8LUMAXD.EPS
PACKAGE OUTLINE, 8L uMAX/uSOP
1
1
21-0036 J
REV.DOCUMENT CONTROL NO.APPROVAL
PROPRIETARY INFORMATION
TITLE:
MAX
0.043
0.006
0.014
0.120
0.120
0.198
0.026
0.007
0.037
0.0207 BSC
0.0256 BSC
A2 A1
c
eb
A
L
FRONT VIEW SIDE VIEW
E H
0.6±0.1
0.6±0.1
Ø0.50±0.1
1
TOP VIEW
D
8
A2 0.030
BOTTOM VIEW
16°
S
b
L
H
E
D
e
c
0°
0.010
0.116
0.116
0.188
0.016
0.005
8
4X S
INCHES
-
A1
A
MIN
0.002
0.950.75
0.5250 BSC
0.25 0.36
2.95 3.05
2.95 3.05
4.78
0.41
0.65 BSC
5.03
0.66
6°0°
0.13 0.18
MAX
MIN
MILLIMETERS
- 1.10
0.05 0.15
α
α
DIM