MAXIM MAX5071BAUA

19-3283; Rev 3; 10/06
High-Performance, Single-Ended, Current-Mode
PWM Controllers
The MAX5070/MAX5071 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 voltage and telecom power
supplies.
The MAX5070/MAX5071 contain a fast comparator with
only 60ns typical delay from current sense to the output
for overcurrent protection. The MAX5070A/MAX5070B
have an integrated error amplifier with the output at
COMP. Soft-start is achieved by controlling the COMP
voltage rise using external components.
The frequency is adjustable from 20kHz to 1MHz with
an external resistor and capacitor. The timing capacitor
discharge current is trimmed allowing for programmable dead time and maximum duty cycle for a given frequency. The available saw-toothed waveform at RTCT
can be used for slope compensation when needed.
The MAX5071A/MAX5071B include a bidirectional synchronization circuit allowing for multiple controllers to
run at the same frequency to avoid beat frequencies.
Synchronization is accomplished by simply connecting
the SYNC pins of all devices together. When synchronizing with other devices, the MAX5071A/MAX5071B
with the highest frequency synchronizes the other
devices. Alternatively, the MAX5071A/MAX5071B can
be synchronized to an external clock with an opendrain output stage running at a higher frequency.
The MAX5071C 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 MAX5070/MAX5071 are available in 8-pin µMAX®
and SO packages and operate over the automotive temperature range of -40°C to +125°C.
Applications
Features
♦ Pin-for-Pin Replacement for UC2842 (MAX5070A)
and UC2844 (MAX5070B)
♦ 2A Drive Source and 1A Sink Capability
♦ Up to 1MHz Switching Frequency Operation
♦ Bidirectional Synchronization
(MAX5071A/MAX5071B)
♦ Advanced Output Drive for Secondary-Side
Synchronous Rectification (MAX5071C)
♦ Fast 60ns Cycle-by-Cycle Current Limit
♦ Trimmed Oscillator Capacitor Discharge Current
Sets Maximum Duty Cycle Accurately
♦ Accurate 5% Start and Stop Voltage with 6V
Hysteresis
♦ Low 32µA Startup Current
♦ 5V Regulator Output (VREF) with 20mA Capability
♦ Overtemperature Shutdown
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX5070AASA
-40°C to +125°C
8 SO
MAX5070AAUA
-40°C to +125°C
8 µMAX
MAX5070BASA
-40°C to +125°C
8 SO
MAX5070BAUA
-40°C to +125°C
8 µMAX
Specify lead-free by adding the + symbol at the end of the part
number when ordering.
Ordering Information continued at end of data sheet.
Selector Guide appears at end of data sheet.
Pin Configurations
TOP VIEW
Universal Input AC/DC Power Supplies
Isolated Telecom Power Supplies
Isolated Power-Supply Modules
Networking Systems
COMP
1
FB 2
3
Computer Systems/Servers
CS
Industrial Power Conversion
RT/CT 4
MAX5070A
MAX5070B
8
VREF
7
VCC
6
OUT
5
GND
Isolated Keep-Alive Circuits
µMAX/SO
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
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.
1
MAX5070/MAX5071
General Description
MAX5070/MAX5071
High-Performance, Single-Ended, Current-Mode
PWM Controllers
ABSOLUTE MAXIMUM RATINGS
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, VREF to GND ...........-0.3V to +6V
COMP Sink Current (MAX5070)..........................................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 (Automotive) ....-40°C to +125°C
Maximum Junction Temperature .....................................+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
(VCC = +15V, RT = 10kΩ, CT = 3.3nF, VVREF = OPEN, CVREF = 0.1µF, COMP = OPEN, VFB = 2V, CS = GND, TA = -40°C to +85°C,
unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
4.950
5.000
5.050
V
0.4
4
mV
25
mV
REFERENCE
Output Voltage
VVREF
TA = +25°C, IVREF = 1mA
Line Regulation
∆VLINE
12V < VCC < 25V, IVREF = 1mA
Load Regulation
∆VLOAD
1mA < IVREF < 20mA
Total Output Variation
VREFT
1mA < IVREF < 20mA, 12V < VCC < 25V
Reference Output-Noise Voltage
VNOISE
10Hz < f < 10kHz, TA = +25°C
Reference Output Short Circuit
IS_SC
6
4.9
5.1
50
V
µV
VVREF = 0V
-30
-100
-180
mA
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
%
1.7
V
OSCILLATOR
RT/CT Voltage Ramp (P-P)
RT/CT Voltage Ramp Valley
VRAMP
VRAMP_VALLEY
Discharge Current
IDIS
Frequency Range
fOSC
1.1
VRT/CT = 2V, TA = +25°C
7.9
8.3
20
%
V
8.7
mA
1000
kHz
ERROR AMPLIFIER (MAX5070A/MAX5070B)
FB Input Voltage
VFB
FB shorted to COMP
2.465
2.5
2.535
V
-0.01
-0.1
µA
FB Input Bias Current
IB(FB)
Open-Loop Voltage Gain
AVOL
Unity-Gain Bandwidth
fGBW
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
-0.5
-1.2
5
5.8
2V ≤ VCOMP ≤ 4V
COMP Source Current
ISOURCE
VFB = 2.3V, VCOMP = 5V
COMP Output High Voltage
VCOMPH
VFB = 2.3V, RCOMP = 15kΩ to GND
COMP Output Low Voltage
VCOMPL
VFB = 2.7V, RCOMP = 15kΩ to VREF
100
dB
1
MHz
-1.8
mA
V
0.1
0.5
V
V/V
CURRENT-SENSE AMPLIFIER
Gain
Maximum Current-Sense Signal
2
ACS
VCS_MAX
(Notes 3, 4)
2.85
3
3.26
MAX5070A/B (Note 3)
0.95
1
1.05
VCOMP = 5V, MAX5071_
0.95
1
1.05
_______________________________________________________________________________________
V
High-Performance, Single-Ended, Current-Mode
PWM Controllers
(VCC = +15V, RT = 10kΩ, CT = 3.3nF, VVREF = OPEN, CVREF = 0.1µF, COMP = OPEN, VFB = 2V, CS = GND, TA = -40°C to +85°C,
unless otherwise noted.) (Note 1)
PARAMETER
Power-Supply Rejection Ratio
SYMBOL
MIN
TYP
MAX
UNITS
12V ≤ VCC ≤ 25V
70
VCOMP = 0V
-1
tCS_DELAY
50mV overdrive
60
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
Input Bias Current
PSRR
CONDITIONS
ICS
Delay From CS to OUT
dB
-2.5
µA
ns
MOSFET DRIVER
ISOURCE (Peak)
ISOURCE
COUT = 10nF
2
ISINK
COUT = 10nF
1
A
Rise Time
tr
COUT = 1nF
15
ns
Fall Time
tf
COUT = 1nF
22
ns
ISINK (Peak)
A
UNDERVOLTAGE LOCKOUT/STARTUP
Startup Voltage Threshold
VCC_START
15.2
16
16.8
V
Minimum Operating Voltage After
Turn-On
VCC_MIN
9.2
10
10.8
V
Undervoltage-Lockout Hysteresis
UVLOHYST
6
V
PWM
Maximum Duty Cycle
DMAX
Minimum Duty Cycle
DMIN
MAX5070A/MAX5071A
MAX5070B/MAX5071B/MAX5071C
94.5
96
97.5
48
49.8
50
0
%
%
SUPPLY CURRENT
Startup Supply Current
ISTART
Operating Supply Current
ICC
VFB = VCS = 0V
Zener Bias Voltage at VCC
VZ
ICC = 25mA
24
32
65
µA
3
5
mA
26.5
V
THERMAL SHUTDOWN
Thermal Shutdown
TSHDN
+150
°C
Thermal-Shutdown Hysteresis
THYST
4
°C
SYNCHRONIZATION (MAX5071A/MAX5071B only) (Note 5)
SYNC Frequency Range
fSYNC
20
SYNC Clock Input High
Threshold
VSYNCINH
3.5
SYNC Clock Input Low Threshold
VSYNCINL
SYNC Clock Input Minimum
Pulse Width
tPW_SYNCIN
200
VSYNCOH
1mA external pulldown
SYNC Clock Output Low Level
VSYNCOL
RSYNC = 5kΩ
ISYNC
VSYNC = 0V
4.0
kHz
V
0.8
SYNC Clock Output High Level
SYNC Leakage Current
1000
V
ns
4.7
V
0
0.1
V
0.01
0.1
µA
_______________________________________________________________________________________
3
MAX5070/MAX5071
ELECTRICAL CHARACTERISTICS (continued)
MAX5070/MAX5071
High-Performance, Single-Ended, Current-Mode
PWM Controllers
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +15V, RT = 10kΩ, CT = 3.3nF, VVREF = OPEN, CVREF = 0.1µF, COMP = OPEN, VFB = 2V, CS = GND, TA = -40°C to +85°C,
unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
2.4
3
MAX
UNITS
ADV_CLK (MAX5071C only)
ADV_CLK High Voltage
VADV_CLKH
IADV_CLK = 10mA source
ADV_CLK Low Voltage
VADV_CLKL
IADV_CLK = 10mA sink
V
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, VVREF = OPEN, CVREF = 0.1µF, COMP = OPEN, VFB = 2V, CS = GND, TA = -40°C to +125°C,
unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
4.950
5.000
5.050
V
0.4
4
mV
6
25
mV
REFERENCE
Output Voltage
VVREF
TA = +25°C, IVREF = 1mA
Line Regulation
∆VLINE
12V < VCC < 25V, IVREF = 1mA
Load Regulation
∆VLOAD
1mA < IVREF < 20mA
Total Output Variation
VREFT
1mA < IVREF < 20mA, 12V < VCC < 25V
Reference Output Noise Voltage
VNOISE
10Hz < f < 10kHz, TA = +25°C
Reference Output Short Circuit
IS_SC
4.9
5.1
50
V
µV
VVREF = 0V
-30
-100
-180
mA
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
OSCILLATOR
RT/CT Voltage Ramp (P-P)
RT/CT Voltage Ramp Valley
VRAMP
VRAMP_VALLEY
Discharge Current
IDIS
Frequency Range
fOSC
%
1.7
V
1.1
VRT/CT = 2V, TA = +25°C
7.9
%
1
8.3
20
V
8.7
mA
1000
kHz
ERROR AMPLIFIER (MAX5070A/MAX5070B)
FB Input Voltage
VFB
FB shorted to COMP
FB Input Bias Current
IB(FB)
Open-Loop Voltage Gain
AVOL
Unity-Gain Bandwidth
fGBW
Power-Supply Rejection Ratio
PSRR
12V ≤ VCC ≤ 25V (Note 2)
ISINK
VFB = 2.7V, VCOMP = 1.1V
COMP Sink Current
2V ≤ VCOMP ≤ 4V
COMP Source Current
ISOURCE
VFB = 2.3V, VCOMP = 5V
COMP Output High Voltage
VCOMPH
VFB = 2.3V, RCOMP =15kΩ to GND
COMP Output Low Voltage
VCOMPL
VFB = 2.7V, RCOMP = 15kΩ to VREF
4
2.465
60
2.5
2.535
V
-0.01
-0.1
µA
100
dB
1
MHz
80
dB
2
6
-0.5
-1.2
5
5.8
0.1
_______________________________________________________________________________________
mA
-1.8
mA
V
0.5
V
High-Performance, Single-Ended, Current-Mode
PWM Controllers
(VCC = +15V, RT = 10kΩ, CT = 3.3nF, VVREF = OPEN, CVREF = 0.1µF, COMP = OPEN, VFB = 2V, CS = GND, TA = -40°C to +125°C,
unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
(Notes 3, 4)
2.85
3
3.26
V/V
MAX5070A/B (Note 3)
0.95
1
1.05
VCOMP = 5V, MAX5071_
0.95
1
1.05
CURRENT-SENSE AMPLIFIER
Gain
ACS
Maximum Current-Sense Signal
Power-Supply Rejection Ratio
Input Bias Current
VCS_MAX
PSRR
12V ≤ VCC ≤ 25V
70
ICS
Delay From CS to OUT
-1
V
dB
-2.5
60
µA
tCS_DELAY
50mV overdrive
ns
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
MOSFET DRIVER
ISOURCE (Peak)
ISOURCE
COUT = 10nF
2
ISINK
COUT = 10nF
1
A
Rise Time
tr
COUT = 1nF
15
ns
Fall Time
tf
COUT = 1nF
22
ns
ISINK (Peak)
A
UNDERVOLTAGE LOCKOUT/STARTUP
Startup Voltage Threshold
VCC_START
15.2
16
16.8
V
Minimum Operating Voltage After
Turn-On
VCC_MIN
9.2
10
10.8
V
Undervoltage-Lockout Hysteresis
UVLOHYST
6
V
PWM
Maximum Duty Cycle
DMAX
Minimum Duty Cycle
DMIN
MAX5070A/MAX5071A
MAX5070B/MAX5071B/MAX5071C
94.5
96
97.5
48
49.8
50
0
%
%
SUPPLY CURRENT
Startup Supply Current
ISTART
Operating Supply Current
ICC
VFB = VCS = 0V
Zener Bias Voltage at VCC
VZ
ICC = 25mA
24
32
65
µA
3
5
mA
26.5
V
THERMAL SHUTDOWN
Thermal Shutdown
TSHDN
+150
°C
Thermal-Shutdown Hysteresis
THYST
4
°C
SYNCHRONIZATION (MAX5071A/MAX5071B only, Note 5)
SYNC Frequency Range
fSYNC
20
SYNC Clock Input High
Threshold
VSYNCINH
3.5
SYNC Clock Input Low Threshold
VSYNCINL
SYNC Clock Input Minimum
Pulse Width
1000
V
0.8
tPW_SYNCIN
200
SYNC Clock Output High Level
VSYNCOH
1mA external pulldown
SYNC Clock Output Low Level
VSYNCOL
RSYNC = 5kΩ
4.0
kHz
V
ns
4.7
0
V
0.1
V
_______________________________________________________________________________________
5
MAX5070/MAX5071
ELECTRICAL CHARACTERISTICS (continued)
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +15V, RT = 10kΩ, CT = 3.3nF, VVREF = OPEN, CVREF = 0.1µF, COMP = OPEN, VFB = 2V, CS = GND, TA = -40°C to +125°C,
unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
SYNC Leakage Current
CONDITIONS
ISYNC
MIN
VSYNC = 0V
TYP
MAX
UNITS
0.01
0.1
µA
ADV_CLK (MAX5071C only)
ADV_CLK High Voltage
VADV_CLKH
IADV_CLK = 10mA source
ADV_CLK Low Voltage
VADV_CLKL
IADV_CLK = 10mA sink
2.4
3
V
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
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
10
mA
All devices are 100% tested at +25°C. All limits over temperature are guaranteed by design, not production tested.
Guaranteed by design, not production tested.
Parameter measured at trip point of latch with VFB = 0V (MAX5070A/MAX5070B only).
Gain is defined as A = ∆VCOMP/∆VCS, 0 ≤ VCS ≤ 0.8V.
Output Frequency equals oscillator frequency for MAX5070A/MAX5071A. Output frequency is one-half oscillator frequency
for MAX5070B/MAX5071B/MAX5071C.
Typical Operating Characteristics
(VCC = 15V, TA = +25°C, unless otherwise noted.)
VCC FALLING
7
6
5
6
HYSTERESIS
MAX5070 toc02
6.0
38
37
36
35
34
33
32
31
CT = 100pF
5.5
SUPPLY CURRENT (mA)
13
12
11
10
9
8
STARTUP CURRENT (µA)
15
14
STARTUP CURRENT vs. TEMPERATURE
40
39
MAX5070 toc01
VCC RISING
OPERATING SUPPLY CURRENT (ICC)
vs. TEMPERATURE AFTER STARTUP
(fOSC = fSW = 250kHz)
MAX5070 toc03
BOOTSTRAP UVLO vs. TEMPERATURE
17
16
VCC (V)
MAX5070/MAX5071
High-Performance, Single-Ended, Current-Mode
PWM Controllers
5.0
4.5
4.0
3.5
3.0
30
29
28
2.5
2.0
-40 -25 -10 5 20 35 50 65 80 95 110 125
-40 -25 -10 5 20 35 50 65 80 95 110 125
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
_______________________________________________________________________________________
High-Performance, Single-Ended, Current-Mode
PWM Controllers
5.3
5.20
5.15
5.0
4.90
4.7
4.85
4.6
4.80
4.5
4.995
4.75
4.990
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
30
10
45
12
14
16
18
20
22
IREF (mA)
VCC (V)
OSCILLATOR FREQUENCY (fOSC)
vs. TEMPERATURE
OSCILLATOR RT/CT DISCHARGE CURRENT
vs. TEMPERATURE
MAXIMUM DUTY CYCLE
vs. TEMPERATURE
510
500
490
480
470
460
450
8.35
8.30
8.25
8.20
8.15
MAX5070A/MAX5071A
80
8.45
8.40
RT = 3.01kΩ
CT = 1nF
90
DUTY CYCLE (%)
520
VRT/CT = 2V
8.55
8.50
24
100
MAX5070 toc08
530
8.60
RT/CT DISCHARGE CURRENT (mA)
MAX5070 toc07
RT = 3.01kΩ
CT = 1nF
26
70
60
MAX5070B/MAX5071B/MAX5071C
50
40
30
20
8.10
8.05
8.00
10
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
-40 -25 -10 5 20 35 50 65 80 95 110 125
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
MAX5070A/MAX5071A
MAXIMUM DUTY CYCLE vs. FREQUENCY
70
CT = 220pF
60
50
CT = 1nF
40
CT = 560pF
MAX5070 toc11
80
1.10
1.08
1.06
CS THRESHOLD (V)
CT = 100pF
90
CURRENT-SENSE (CS) TRIP THRESHOLD
vs. TEMPERATURE
MAX5070 toc10
100
DUTY CYCLE (%)
OSCILLATOR FREQUENCY (kHz)
15
TEMPERATURE (°C)
550
540
5.000
4.95
IREF = 20mA
4.8
5.00
MAX5070 toc09
4.9
5.05
VVREF (V)
IREF = 1mA
5.1
IREF = 1mA
5.005
5.10
VVREF (V)
VVREF (V)
5.2
5.010
MAX5070 toc06
5.4
MAX5070 toc05
5.25
MAX5070 toc04
5.5
REFERENCE VOLTAGE (VREF)
vs. VCC VOLTAGE
REFERENCE VOLTAGE (VREF)
vs. REFERENCE LOAD CURRENT
REFERENCE VOLTAGE (VREF)
vs. TEMPERATURE
1.04
1.02
1.00
0.98
30
0.96
20
0.94
10
0.92
0.90
0
0
400
800
1200
1600
OSCILLATOR FREQUENCY (kHz)
2000
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
_______________________________________________________________________________________
7
MAX5070/MAX5071
Typical Operating Characteristics (continued)
(VCC = 15V, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
(VCC = 15V, TA = +25°C, unless otherwise noted.)
OUT IMPEDANCE vs. TEMPERATURE
(RDS_ON PMOS DRIVER)
10
1
CT = 10nF
CT = 4.7nF
CT = 3.3nF
CT = 2.2nF
0.1
ISOURCE = 100mA
9.0
8.5
ISINK = 200mA
8.0
7.5
RDS_ON (Ω)
100
5.0
4.8
4.6
4.4
4.2
4.0
3.8
3.6
3.4
3.2
3.0
2.8
2.6
2.4
2.2
2.0
MAX5070 toc13
MAX5070 toc12
CT = 1nF
CT = 560pF
CT = 220pF
CT = 100pF
RDS_ON (Ω)
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
TEMPERATURE (°C)
PROPAGATION DELAY FROM CURRENT-LIMIT
COMPARATOR TO OUT vs. TEMPERATURE
ERROR-AMPLIFIER OPEN-LOOP GAIN
AND PHASE vs. FREQUENCY
COMP VOLTAGE LEVEL TO TURN OFF DEVICE
vs. TEMPERATURE
100k
1M
10M
MAX5070 toc16
90
80
70
GAIN (dB)
60
50
40
2.5
140
10
120
-15
2.3
100
-40
2.2
GAIN
-65
80
PHASE
60
-90
2.4
VCOMP (V)
MAX5070 toc15
100
2.1
2.0
1.9
40
-115
20
20
-140
10
0
-165
1.6
0
-20
-190
10k 100k 1M 10M 100M
1.5
30
-40 -25 -10 5 20 35 50 65 80 95 110 125
0.01 1
TEMPERATURE (°C)
10 100 1k
10V < VCC < 18V
1.8
1.7
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
FREQUENCY (Hz)
ADV_CLK RISING EDGE TO OUT RISING EDGE
PROPAGATION DELAY vs. TEMPERATURE
ADV_CLK AND OUT WAVEFORMS
PROPAGATION DELAY (ns)
MAX5070 toc18
MAX5070 toc19
114
112
110
108
106
104
102
100
98
96
94
92
90
MAX5071C
VCC = 15V
MAX5071C
ADV_CLK
5V/div
10kΩ LOAD
OUT
10V/div
-40 -25 -10 5 20 35 50 65 80 95 110 125
20ns/div
TEMPERATURE (°C)
8
MAX5070 toc17
-40 -25 -10 5 20 35 50 65 80 95 110 125
FREQUENCY (Hz)
10k
PHASE (DEGREES)
RT RESISTANCE (kΩ)
1000
OUT IMPEDANCE vs. TEMPERATURE
(RDS_ON NMOS DRIVER)
MAX5070 toc14
TIMING RESISTANCE (RT)
vs. OSCILLATOR FREQUENCY
PROPAGATION DELAY (ns)
MAX5070/MAX5071
High-Performance, Single-Ended, Current-Mode
PWM Controllers
_______________________________________________________________________________________
High-Performance, Single-Ended, Current-Mode
PWM Controllers
IOUT
2A/div
SUPPLY CURRENT (mA)
90
80
8
TA = +125°C
7
6
MAX5070 toc22
9
VOUT
10V/div
100
MAX5070 toc21
10
TA = +85°C
TA = +25°C
5
DUTY CYCLE (%)
MAX5070 toc20
VCC = 15V
COUT = 10nF
MAX5070A/MAX5071A
MAXIMUM DUTY CYCLE vs. RT
SUPPLY CURRENT (ICC)
vs. OSCILLATOR FREQUENCY (CT = 100pF)
OUT SOURCE AND SINK CURRENTS
CT = 1nF
CT = 560pF
CT = 220pF
CT = 100pF
70
60
50
40
4
TA = -40°C
30
3
20
2
20 120 220 320 420 520 620 720 820 920 1020
20Ons/div
FREQUENCY (kHz)
100
1k
10k
100k
RT (Ω)
Pin Descriptions
MAX5070A/MAX5070B
PIN
NAME
FUNCTION
1
COMP
2
FB
Error-Amplifier Inverting Input
3
CS
Input to the PWM Comparator and Overcurrent Protection Comparator. The current-sense signal is
compared to a signal proportional to the error-amplifier output voltage.
4
RT/CT
Timing Resistor and Capacitor Connection. A resistor RT from RT/CT to VREF and capacitor CT from
RT/CT to GND set the oscillator frequency.
5
GND
Power-Supply Ground. Place the VCC and VREF 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.
7
VCC
Power-Supply Input for MAX5070. 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
VREF
5V Reference Output. Bypass VREF to GND with a 0.1µF ceramic capacitor or a parallel combination
of a 0.1µF and a higher value ceramic capacitor.
Error-Amplifier Output. COMP can be used for soft-start.
_______________________________________________________________________________________
9
MAX5070/MAX5071
Typical Operating Characteristics (continued)
(VCC = 15V, TA = +25°C, unless otherwise noted.)
MAX5070/MAX5071
High-Performance, Single-Ended, Current-Mode
PWM Controllers
Pin Descriptions (continued)
MAX5071A/MAX5071B/MAX5071C
PIN
NAME
FUNCTION
1
COMP
COMP is level-shifted and connected to the inverting input of the PWM comparator. Pull
up COMP to VREF through a resistor and connect an optocoupler from COMP to GND for
proper operation.
2
—
SYNC
Bidirectional Synchronization Input. When synchronizing with other
MAX5071A/MAX5071Bs, the higher frequency part synchronizes all other devices.
—
2
ADV_CLK
3
3
CS
4
4
RT/CT
Timing Resistor and Capacitor Connection. A resistor RT from RT/CT to VREF and
capacitor CT from RT/CT to GND set the oscillator frequency.
5
5
GND
Power-Supply Ground. Place the VCC and VREF 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.
MAX5071A/
MAX5071B
MAX5071C
1
10
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).
Input to the PWM Comparator and Overcurrent Protection Comparator. The currentsense signal is compared to the voltage at COMP.
7
7
VCC
Power-Supply Input for MAX5071. 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
VREF
5V Reference Output. Bypass VREF to GND with a 0.1µF ceramic capacitor or a parallel
combination of a 0.1µF and a higher value ceramic capacitor.
______________________________________________________________________________________
High-Performance, Single-Ended, Current-Mode
PWM Controllers
UVLO
2.5V
REFERENCE
2.5V
16V/10V
PREREGULATOR
5V
VOLTAGEDIVIDER
2.5V
7 VCC
THERMAL
SHUTDOWN
EN-REF
26.5V
VDD
BG 5V REGULATOR
SNS
EN-DRV-BAR
REG_OK
8 VREF
VP
DELAY
VOLTAGEDIVIDER
1V
ILIM
S
6 OUT
Q
CLK
R
CS 3
CPWM
GND 5
OSC Q
4 RT/CT
2R
VEA
FB 2
COMP 1
R
100% MAX DUTY CYCLE (MAX5070A)
50% MAX DUTY CYCLE (MAX5070B)
Figure 1. MAX5070A/MAX5070B Functional Diagram
Detailed Description
The MAX5070/MAX5071 current-mode PWM controllers
are designed for use as the control and regulation core of
flyback or forward topology switching power supplies.
These devices incorporate an integrated low-side driver,
adjustable oscillator, error amplifier (MAX5070A/
MAX5070B only), current-sense amplifier, 5V reference,
and external synchronization capability (MAX5071A/
MAX5071B only). An internal +26.5V current-limited VCC
clamp prevents overvoltage during startup.
Five different versions of the MAX5070/MAX5071 are
available. The MAX5070A/MAX5070B are the standard
versions with a feedback input (FB) and internal error
amplifier. The MAX5071A/MAX5071B include bidirectional synchronization (SYNC). This enables multiple
MAX5071A/MAX5071Bs to be connected and synchronized to the device with the highest frequency. The
MAX5071C includes an ADV_CLK output, which precedes the MAX5071C’s drive output (OUT) by 110ns.
Figures 1, 2, and 3 show the internal functional diagrams
of the MAX5070A/MAX5070B, MAX5071A/MAX5071B,
and MAX5071C, respectively. The MAX5070A/
MAX5071A are capable of 100% maximum duty cycle.
The MAX5070B/MAX5071B/MAX5071C are designed to
limit the maximum duty cycle to 50%.
______________________________________________________________________________________
11
MAX5070/MAX5071
VP
MAX5070A/MAX5070B
MAX5070/MAX5071
High-Performance, Single-Ended, Current-Mode
PWM Controllers
VP
MAX5071A/MAX5071B
UVLO
2.5V
1V
REFERENCE
2.5V
16V/10V
PREREGULATOR
5V
VOLTAGEDIVIDER
2.5V
7 VCC
THERMAL
SHUTDOWN
EN-REF
26.5V
VDD
BG 5V REGULATOR
SNS
EN-DRV-BAR
REG_OK
8 VREF
VP
DELAY
VOLTAGEDIVIDER
1V
ILIM
S
Q
6 OUT
CLK
R
CS 3
CPWM
GND 5
OSC Q
100% MAX DUTY CYCLE (MAX5071A)
50% MAX DUTY CYCLE (MAX5071B)
2R
COMP 1
4 RT/CT
R
SYNC 2
BIDIRECTIONAL
SYNC
Figure 2. MAX5071A/MAX5071B Functional Diagram
Current-Mode Control Loop
The advantages of current-mode control over voltagemode 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-bycycle basis. Secondly, the stability requirements of the
current-mode controller are reduced to that of a singlepole system unlike the double pole in the voltage-mode
control scheme.
12
The MAX5070/MAX5071 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 signal is lower than the noninverting input of the PWM comparator, the output of the CPWM comparator is low and
the switch is turned on at each clock pulse. When the
current-sense signal is higher than the inverting input of
the CPWM, the output of the CPWM comparator is high
and the switch is turned off.
______________________________________________________________________________________
High-Performance, Single-Ended, Current-Mode
PWM Controllers
MAX5070/MAX5071
VP
MAX5071C
UVLO
2.5V
1V
REFERENCE
2.5V
16V/10V
PREREGULATOR
5V
2.5V
7 VCC
THERMAL
SHUTDOWN
EN-REF
26.5V
VDD
BG 5V REGULATOR
SNS
EN-DRV-BAR
REG_OK
VOLTAGEDIVIDER
8 VREF
VP
DELAY
VOLTAGEDIVIDER
1V
ILIM
S
Q
6 OUT
CLK
R
CS 3
CPWM
GND 5
OSC Q
50% MAX DUTY CYCLE
2R
4 RT/CT
COMP 1
R
ADV_CLK 2
Figure 3. MAX5071C Functional Diagram
VCC and Startup
In normal operation, VCC is derived from a tertiary winding 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 V CC reaches the undervoltage-lockout
threshold of 16V, the output driver begins to switch and
the tertiary winding will supply 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 maximum startup bias (ISTART) of the device (65µA max)
and the charging current for CST. The startup capacitor
CST must charge to 16V within the desired time period
t ST (for example, 500ms). The size of the startup
capacitor depends on:
1) IC operating supply current at a programmed oscillator frequency (fOSC).
2) The time required for the bias voltage, derived from
a bias winding, to go from 0 to 11V.
3) The MOSFET total gate charge.
4) The operating frequency of the converter (fSW).
______________________________________________________________________________________
13
MAX5070/MAX5071
High-Performance, Single-Ended, Current-Mode
PWM Controllers
To calculate the capacitance required, use the following
formula:
⎡
⎛V
− 13V ⎞ ⎤
⎢ICC + IG − ⎜ INMIN
⎟ ⎥(t SS )
RST
⎝
⎠ ⎥⎦
⎢⎣
CST =
VHYST
where:
IG = QG fSW
ICC is the MAX5070/MAX5071s’ maximum internal supply 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 hysteresis (6V), 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 following equations to calculate the average charging current
(ICST) and the startup resistor (RST).
V
× CST
ICST = SUVR
t ST
VSUVR ⎞
⎛
⎜ VINMIN −
⎟
⎝
2 ⎠
RST ≅
ICST + ISTART
Where VINMIN is the minimum input supply voltage for
the application (36V for telecom), VSUVR is the bootstrap UVLO wake-up level (16V), 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 in order to minimize
power loss in RST.
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 16V to 10V
must be greater than the soft-start time (tSS).
Undervoltage Lockout (UVLO)
The minimum turn-on supply voltage for the
MAX5070/MAX5071 is 16V. Once VCC reaches 16V, the
reference powers up. There is 6V of hysteresis from the
minimum turn-on voltage to the UVLO threshold. Once
VCC reaches 16V, the MAX5070/MAX5071 will operate
with VCC down to 10V. Once VCC goes below 10V the
device is in UVLO. When in UVLO, the quiescent supply current into VCC falls back to 37µA (typ), and OUT
and VREF 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 3.5Ω and the on-resistance of the NMOS
typically 4.5Ω. The driver can source 2A typically and
sink 1A typically. This allows for the MAX5070/MAX5071
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 MAX5070/MAX5071. 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
MAX5070/MAX5071 is a function of the average output
drive current (IDRIVE). Use the following equation to calculate the power dissipation in the device due to IDRIVE:
IDRIVE = QG x fSW
PD = (IDRIVE + ICC) x VCC
where I CC is the operating supply current. See the
Typical Operating Characteristics for the operating
supply current at a given frequency.
Error Amplifier (MAX5070A/MAX5070B)
The MAX5070 includes an internal error amplifier. The
inverting input is at FB and the noninverting input is internally 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 will be:
R1 ⎞
⎛
VOUT = ⎜1 +
⎟ × 2.5V
⎝ R2 ⎠
where R1 and R2 are from Figure 6.
14
______________________________________________________________________________________
High-Performance, Single-Ended, Current-Mode
PWM Controllers
The MAX5071A/MAX5071B/MAX5071C are designed to
be used with either an external error amplifier when
designed into a nonisolated 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 pin to the output
of the external error amplifier for nonisolated design.
Pull COMP high externally to at least 5V (or VREF) 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. If the maximum external COMP voltage is below
4.9V, it may reduce the PWM current-limit threshold
below 1V. Use the following equation to calculate minimum COMP voltage (VCOMP) required for a guaranteed
peak primary current (IP-P):
VCOMP = (3 x IP-P x RCS) + 1.95V
where RCS is a current-sense resistor.
Oscillator
The oscillator frequency is adjusted by adding an
external capacitor and resistor at RT/CT (see RT and CT
in the Typical Application Circuits). RT is connected
from RT/CT to the 5V reference (VREF) and CT is connected from RT/CT to GND. VREF charges CT through
RT until its voltage reaches 2.8V. CT then discharges
through an 8.3mA internal current sink until CT’s voltage
reaches 1.1V, at which time C T is allowed to charge
through RT again. 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 RT x CT
The discharge time is then:
tD =
RT × CT × 103
4.88 × RT − 1.8 × 103
The oscillator frequency will then be:
fOSC =
1
tC + tD
Reference Output
VREF is a 5V reference output that can source 20mA.
Bypass VREF to GND with a 0.1µF capacitor.
Current Limit
The MAX5070/MAX5071 include a fast current-limit comparator to terminate the ON cycle during an overload or a
fault condition. The current-sense resistor (RCS), connected between the source of the MOSFET and GND, sets
the current limit. The CS input has a voltage trip level
(VCS) of 1V. Use the following equation to calculate RCS:
V
RCS = CS
IP − P
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 currentlimit 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 (MAX5071A/MAX5071B)
SYNC
SYNC is a bidirectional input/output that outputs a synchronizing pulse and accepts a synchronizing pulse
from other MAX5071A/MAX5071Bs (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) from between
500Ω and 5kΩ. As an input, SYNC accepts the output
pulses from other MAX5071A/MAX5071Bs.
Synchronize multiple MAX5071A/MAX5071Bs by connecting 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 CT discharge time tD. Adjust
RT/CT such that the minimum discharge time tD is 200ns.
For the MAX5070A/MAX5071A, the converter output
switching frequency (fSW) is the same as the oscillator
frequency (f OSC ). For the MAX5070B/MAX5071B/
MAX5071C, the output switching frequency is 1/2 the
oscillator frequency.
______________________________________________________________________________________
15
MAX5070/MAX5071
MAX5071A/MAX5071B/MAX5071C
Feedback
MAX5070/MAX5071
High-Performance, Single-Ended, Current-Mode
PWM Controllers
Advance Clock Output (ADV_CLK) (MAX5071C)
ADV_CLK is an advanced pulse output provided to
facilitate the easy implementation of secondary-side
synchronous rectification using the MAX5071C. 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 synchronous-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 highspeed optocoupler. The 85ns pulse, with 3V drive voltage (10mA source), significantly reduces the
volt-second requirement of the pulse transformer and
the advanced pulse alleviates the need for a highspeed optocoupler.
RT/CT
OUT
tADV_CLK = 110ns
ADV_CLK
tPULSE = 85ns
Thermal Shutdown
Figure 4. ADV_CLK
When the MAX5070/MAX5071s’ die temperature goes
above +150°C, the thermal-shutdown circuitry will shut
down the 5V reference and pull OUT low.
Typical Application Circuits
VIN
RST
VOUT
CST
1
R1
2
R2
RT
3
4
COMP
VREF
FB
MAX5070A VCC
MAX5070B
CS
OUT
RT/CT
GND
8
7
6
N
5
CT
RCS
Figure 5. MAX5070A/MAX5070B Typical Application Circuit (Isolated Flyback with Primary-Side Regulation)
16
______________________________________________________________________________________
High-Performance, Single-Ended, Current-Mode
PWM Controllers
VIN
RST
VOUT
CST
1
R1
2
R2
3
RT
4
COMP
VREF
FB
MAX5070A VCC
MAX5070B
CS
OUT
RT/CT
GND
8
7
6
N
5
CT
RCS
Figure 6. MAX5070A/MAX5070B Typical Application Circuit (Non-Isolated Flyback)
VIN
RST
SYNC
INPUT/OUTPUT
VOUT
CST
RSYNC
1
2
RT
3
4
COMP
VREF
SYNC MAX5071A
VCC
MAX5071B
CS
OUT
RT/CT
GND
8
7
6
N
5
CT
RCS
Figure 7. MAX5071A/MAX5071B Typical Application Circuit (Isolated Flyback)
______________________________________________________________________________________
17
MAX5070/MAX5071
Typical Application Circuits (continued)
High-Performance, Single-Ended, Current-Mode
PWM Controllers
MAX5070/MAX5071
Typical Application Circuits (continued)
VD
VIN
VOUT
RST
N
QS
CST
N
QR
VD
VCC
VREF
RT
N
OUT
MAX5071C
RT/CT
CS
CT
RCS
COMP
ADV_CLK
MAX5078
GND
0.5V/µs PULSE TRANSFORMER
Figure 8. MAX5071C Typical Application Circuit (Isolated Forward with Secondary-Side Synchronous Rectification)
18
______________________________________________________________________________________
High-Performance, Single-Ended, Current-Mode
PWM Controllers
VIN
VIN
VCC
VREF
RT
VCC
OUT
VREF
RT
MAX5071A
MAX5071B
RT/CT
N
VCC
OUT
N
N
MAX5071A
MAX5071B
CS
CT
SYNC
GND
OUT
RT/CT
CS
CT
SYNC
VREF
RT
MAX5071A
MAX5071B
RT/CT
CS
CT
MAX5070/MAX5071
VIN
SYNC
GND
GND
TO OTHER
MAX5071A/Bs
RSYNC
Figure 9. Synchronization of MAX5071s
______________________________________________________________________________________
19
MAX5070/MAX5071
High-Performance, Single-Ended, Current-Mode
PWM Controllers
Selector Guide
PART
FEEDBACK/
ADVANCED CLOCK
MAXIMUM DUTY
CYCLE (%)
PIN-PACKAGE
PIN COMPATIBLE
MAX5070AASA
Feedback
100
8 SO
UC2842/UCC2842
MAX5070AAUA
Feedback
100
8 µMAX
UC2842/UCC2842
MAX5070BASA
Feedback
50
8 SO
UC2844/UCC2844
MAX5070BAUA
Feedback
50
8 µMAX
UC2844/UCC2844
MAX5071AASA
Sync.
100
8 SO
—
MAX5071AAUA
Sync.
100
8 µMAX
—
MAX5071BASA
Sync.
50
8 SO
—
MAX5071BAUA
Sync.
50
8 µMAX
—
MAX5071CASA
ADV_CLK
50
8 SO
—
MAX5071CAUA
ADV_CLK
50
8 µMAX
—
Pin Configurations (continued)
TOP VIEW
COMP
1
SYNC
2
CS
3
MAX5071A
MAX5071B
RT/CT 4
8
VREF
7
VCC
-40°C to +125°C
8 SO
MAX5071AAUA
-40°C to +125°C
8 µMAX
MAX5071BASA
-40°C to +125°C
8 SO
MAX5071BAUA
-40°C to +125°C
8 µMAX
MAX5071CASA
-40°C to +125°C
8 SO
MAX5071CAUA
-40°C to +125°C
8 µMAX
7
VCC
MAX5071C
CS
3
6
OUT
5
GND
RT/CT 4
5
GND
PIN-PACKAGE
MAX5071AASA
VREF
OUT
Ordering Information (continued)
TEMP RANGE
ADV_CLK 2
8
6
µMAX/SO
PART
COMP 1
µMAX/SO
Chip Information
TRANSISTOR COUNT: 1987
PROCESS: BiCMOS
Specify lead-free by adding the + symbol at the end of the part
number when ordering.
20
______________________________________________________________________________________
High-Performance, Single-Ended, Current-Mode
PWM Controllers
N
E
H
INCHES
MILLIMETERS
MAX
MIN
0.069
0.053
0.010
0.004
0.014
0.019
0.007
0.010
0.050 BSC
0.150
0.157
0.228
0.244
0.016
0.050
MAX
MIN
1.35
1.75
0.10
0.25
0.35
0.49
0.19
0.25
1.27 BSC
3.80
4.00
5.80
6.20
0.40
SOICN .EPS
DIM
A
A1
B
C
e
E
H
L
1.27
VARIATIONS:
1
INCHES
TOP VIEW
DIM
D
D
D
MIN
0.189
0.337
0.386
MAX
0.197
0.344
0.394
MILLIMETERS
MIN
4.80
8.55
9.80
MAX
5.00
8.75
10.00
N MS012
8
AA
14
AB
16
AC
D
A
B
e
C
0∞-8∞
A1
L
FRONT VIEW
SIDE VIEW
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, .150" SOIC
APPROVAL
DOCUMENT CONTROL NO.
21-0041
REV.
B
1
1
______________________________________________________________________________________
21
MAX5070/MAX5071
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.)
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.)
4X S
8
E
Ø0.50±0.1
8
INCHES
DIM
A
A1
A2
b
H
c
D
e
E
H
0.6±0.1
1
L
1
α
0.6±0.1
S
BOTTOM VIEW
D
MIN
0.002
0.030
MAX
0.043
0.006
0.037
0.014
0.010
0.007
0.005
0.120
0.116
0.0256 BSC
0.120
0.116
0.198
0.188
0.026
0.016
6°
0°
0.0207 BSC
8LUMAXD.EPS
MAX5070/MAX5071
High-Performance, Single-Ended, Current-Mode
PWM Controllers
MILLIMETERS
MAX
MIN
0.05
0.75
1.10
0.15
0.95
0.25
0.36
0.13
0.18
2.95
3.05
0.65 BSC
2.95
3.05
4.78
5.03
0.41
0.66
0°
6°
0.5250 BSC
TOP VIEW
A1
A2
e
A
c
b
FRONT VIEW
α
L
SIDE VIEW
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, 8L uMAX/uSOP
APPROVAL
DOCUMENT CONTROL NO.
21-0036
REV.
J
1
1
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.