General Description
The MAX5021/MAX5022 current-mode PWM controllers
contain all the control circuitry required for the design
of wide input voltage range isolated power supplies.
These devices are well suited for use in universal input
(85VAC to 265VAC) off-line or telecom (-36VDC to
-72VDC) power supplies.
An undervoltage lockout (UVLO) circuit with large hys-
teresis coupled with low startup and operating current
reduce power dissipation in the startup resistor and
allow use of ceramic bypass capacitors. The 262kHz
switching frequency is internally trimmed to ±12%
accuracy; this allows the optimization of the magnetic
and filter components resulting in compact, cost-effec-
tive power supplies. The MAX5021 with 50% maximum
duty cycle and MAX5022 with 75% maximum duty
cycle are recommended for forward converters and fly-
back converters, respectively. The MAX5021/MAX5022
are available in 6-pin SOT23, 8-pin µMAX, and 8-pin
DIP packages and are rated for operation over the
-40°C to +85°C temperature range.
Applications
Universal Off-Line Power Supplies
Standby Power Supplies
Isolated Power Supplies
Isolated Telecom Power Supplies
Mobile Phone Chargers
Features
♦Available in a Tiny 6-Pin SOT23 Package
♦50µA Typical Startup Current
♦1.2mA Typical Operating Current
♦Large UVLO Hysteresis of 14V
♦Fixed Switching Frequency of 262kHz ±12%
♦50% Maximum Duty Cycle Limit (MAX5021)
♦75% Maximum Duty Cycle Limit (MAX5022)
♦60ns Cycle-by-Cycle Current-Limit Response
Time
MAX5021/MAX5022
Current-Mode PWM Controllers for Isolated
Power Supplies
________________________________________________________________ Maxim Integrated Products 1
GND
VCC
NDRV
16OPTO
5VIN
CS
MAX5021
MAX5022
SOT23
TOP VIEW
2
34
NDRV
N.C.N.C.
1
2
8
7
CS
GNDVIN
VCC
OPTO
PDIP/µMAX
3
4
6
5
MAX5021
MAX5022
Pin Configuration
Ordering Information
MAX5021
MAX5022
VOUT
VSUPPLY
OPTO NDRV
CS
VCC VIN
GND
Typical Operating Circuit
19-2066; Rev 1; 9/01
EVALUATION KIT AVAILABLE
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
MAX
DUTY
CYCLE
TEMP.
RANGE
PIN-
PACKAGE
TOP
MARK
MAX5021EUT 50% -40°C to +85°C 6 SOT23-6 AASQ
MAX5021EUA 50% -40°C to +85°C 8 µMAX —
MAX5021EPA 50% -40°C to +85°C 8 PDIP —
MAX5022EUT 75% -40°C to +85°C 6 SOT23-6 AASR
MAX5022EUA 75% -40°C to +85°C 8 µMAX —
MAX5022EPA 75% -40°C to +85°C 8 PDIP —
WARNING: The MAX5021/MAX5022 are designed to work
with high voltages. Exercise caution!
MAX5021/MAX5022
Current-Mode PWM Controllers for Isolated
Power Supplies
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN = +11V to +28V, VCS = 0, OPTO is unconnected, 10nF bypass capacitors at VIN and VCC, NDRV unconnected, TA= -40°C to
+85°C, unless otherwise noted. Typical values are at VIN = +12V, TA= +25°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.
VIN to GND .............................................................-0.3V to +30V
VCC to GND............................................................-0.3V to +13V
NDRV to GND.............................................-0.3V to (VCC + 0.3V)
CS, OPTO to GND ....................................................-0.3V to +6V
NDRV Short-Circuit to GND........................................Continuous
Continuous Power Dissipation (TA= +70°C)
6-Pin SOT23 (derate 8.7mW/°C above +70°C).............696mW
8-Pin µMAX (derate 4.5mW/°C above +70°C) ..............362mW
8-Pin PDIP (derate 9.1mW/°C above +70°C)................727mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-55°C to +150°C
Lead Temperature (soldering 10s) ..................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
UNDERVOLTAGE LOCKOUT/STARTUP
Undervoltage Lockout Wakeup
Level VUVR VIN rising 22 24 26 V
Undervoltage Lockout Shutdown
Level VUVF VIN falling 9.3 10 10.9 V
VIN Supply Current at Startup ISTART VIN = +22V 50 85 µA
VIN Range VIN 11 28 V
TUVR VIN steps up from +9V to +26V 5
Undervoltage Lockout
Propagation Delay TUVF VIN steps down from +26V to +9V 1 µs
INTERNAL SUPPLY
VCC Regulator Set Point VCCSP VIN = +11V to +28V, sourcing 1µA to 5mA
from VCC 7.0 10.5 V
VIN = +28V, OPTO connected to GND 0.9 2.43
VIN Supply Current after Startup IIN VIN = +28V, OPTO unconnected (Note 2) 0.4 mA
GATE DRIVER
RON
(
LOW
)
Measured at NDRV sinking 5mA 10 20
Driver Output Impedance RON
(
HIGH
)
Measured at NDRV sourcing 5mA 20 40 Ω
Driver Peak Sink Current ISINK 250 mA
Driver Peak Source Current ISOURCE 150 mA
PWM COMPARATOR
Comparator Offset Voltage VOPWM VOPTO - VCS 600 750 900 mV
CS Input Bias Current ICS -2 +2 µA
Propagation Delay from
Comparator Input to NDRV TPWM 25mV overdrive 60 ns
Minimum On-Time TON
(
MIN
)
150 ns
CURRENT-LIMIT COMPARATOR
Current-Limit Trip Threshold VCS 540 600 660 mV
Current-Limit Propagation Delay
from Comparator Input to NDRV TCL 25mV overdrive 60 ns
MAX5021/MAX5022
Current-Mode PWM Controllers for Isolated
Power Supplies
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VIN = +11V to +28V, VCS = 0, OPTO is unconnected, 10nF bypass capacitors at VIN and VCC, NDRV unconnected, TA= -40°C to
+85°C, unless otherwise noted. Typical values are at VIN = +12V, TA= +25°C, unless otherwise noted.) (Note 1)
Note 1: All devices are 100% tested at TA= +25°C. All limits over temperature are guaranteed by characterization.
Note 2: This minimum current after startup is a safeguard that prevents the VIN pin voltage from rising in the event
that OPTO and NDRV become unconnected.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OSCILLATOR
Switching Frequency fSW 230 262 290 kHz
MAX5021 50 51
Maximum Duty Cycle DMAX MAX5022 75 76 %
OPTO INPUT
OPTO Pullup Voltage VOPTO OPTO sourcing 10µA 5.5 V
OPTO Pullup Resistance ROPTO 4.5 6.2 7.9 kΩ
Typical Operating Characteristics
(VIN = 15V, TA = +25°C, unless otherwise noted.)
23.9
24.0
24.1
24.2
24.3
UNDERVOLTAGE LOCKOUT
vs. TEMPERATURE
MAX5021/22 toc01
TEMPERATURE (°C)
UNDERVOLTAGE LOCKOUT (V)
-40 20 40-20 0 60 80
VIN RISING
9.8
9.9
10.0
10.1
10.2
UNDERVOLTAGE LOCKOUT
vs. TEMPERATURE
MAX5021/22 toc02
TEMPERATURE (°C)
UNDERVOLTAGE LOCKOUT (V)
-40 20 40-20 0 60 80
VIN FALLING
47
48
49
50
51
52
53
-40 -20 0 20 40 60 80
STARTUP CURRENT
vs. TEMPERATURE
MAX5021/22 toc03
TEMPERATURE (°C)
STARTUP CURRENT (µA)
VIN = 23.0V
MAX5021/MAX5022
Current-Mode PWM Controllers for Isolated
Power Supplies
4 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(VIN = 15V, TA = +25°C, unless otherwise noted.)
1.40
1.45
1.50
1.55
1.60
SUPPLY CURRENT
vs. TEMPERATURE
MAX5021/22 toc04
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
-40 20 40-20 0 60 80
VIN = 28.0V
VOPTO = VCS = 0
9.00
9.03
9.09
9.06
9.12
9.15
-40 0-20 20 40 60 80
MAXIMUM VCC
vs. TEMPERATURE
MAX5021/22 toc05
TEMPERATURE (°C)
MAXIMUM VCC (V)
VIN = 28.0V
VCS = 0
OPTO = UNCONNECTED
7.70
7.90
7.80
8.10
8.00
8.20
8.30
-40 20 40-20 0 60 80
MINIMUM VCC
vs. TEMPERATURE
MAX5021/22 toc06
TEMPERATURE (°C)
MINIMUM VCC (V)
VIN = 10.8V
5mA LOAD ON VCC
VCS = 0
OPTO = UNCONNECTED
570
590
580
610
600
630
620
640
-40 0 20-20 40 60 80
CURRENT SENSE THRESHOLD
vs. TEMPERATURE
MAX5021/22 toc07
TEMPERATURE (°C)
CURRENT SENSE THRESHOLD (mV)
+3σ
-3σ
MEAN
TOTAL NUMBER OF
DEVICES = 50
0
5
15
10
20
25
540 580560 620 640 660
CURRENT SENSE
THRESHOLD
MAX5021/22 toc08
CURRENT SENSE THRESHOLD (mV)
FREQUENCY (%)
TOTAL NUMBER
OF DEVICES = 200
600
245
255
250
265
260
275
270
280
-40 0 20-20 40 60 80
OSCILLATOR FREQUENCY
vs. TEMPERATURE
MAX5021/22 toc09
TEMPERATURE (°C)
OSCILLATOR FREQUENCY (kHz)
TOTAL NUMBER
OF DEVICES = 50
+3σ
-3σ
MEAN
0
5
15
10
20
25
230 250240 260 270 280 290
OSCILLATOR FREQUENCY
MAX5021/22 toc10
OSCILLATOR FREQUENCY (kHz)
FREQUENCY (%)
TOTAL NUMBER
OF DEVICES = 200
50
55
65
60
70
75
-40 0-20 20 40 60 80
CURRENT SENSE DELAY
vs. TEMPERATURE
MAX5021/22 toc11
TEMPERATURE (°C)
CURRENT SENSE DELAY (ns)
0
2
1
4
3
5
6
-40 20 40-20 0 60 80
UNDERVOLTAGE LOCKOUT
DELAY vs. TEMPERATURE
MAX5021/22 toc12
TEMPERATURE (°C)
UNDERVOLTAGE LOCKOUT DELAY (µs)
VIN RISING
VIN FALLING
Detailed Description
The MAX5021/MAX5022 are current-mode PWM con-
trollers that have been specifically designed for use in
isolated power supplies. An undervoltage lockout cir-
cuit (UVLO) with a large hysteresis (14V) along with
very low startup and operating current result in high-
efficiency, universal input power supplies. Both devices
can be used in power supplies capable of operating
from a universal 85VAC to 265VAC line or the telecom
voltage range of -36VDC to -72VDC.
Power supplies designed with these devices use a
high-value startup resistor, RS, (series combination of
R1and R2) that charges a reservoir capacitor, C2 (see
Figure 1). During this initial period while the voltage is
less than the UVLO start threshold, the IC typically con-
sumes only 50µA of quiescent current. This low startup
current and the large UVLO hysteresis combined with
the use of a ceramic capacitor C2 keeps the power dis-
sipation in RSto less than 1/4W even at the high end of
the universal AC input voltage (265VAC).
The MAX5021/MAX5022 include a cycle-by-cycle cur-
rent limit which turns off the gate drive to the external
MOSFET during an overcurrent condition. If the output
on the secondary side of transformer T1 is shorted, the
tertiary winding voltage will drop below the 10V thresh-
old causing the UVLO circuit to turn off the gate drive to
the external power MOSFET, thus re-initiating the start-
up sequence.
Startup
Figure 2 shows the voltages on VIN and VCC during
startup. Initially, both VIN and VCC are 0V. After the line
voltage is applied, C2 charges through the startup
resistor, RS, to an intermediate voltage at which point
the internal reference and regulator begin charging C3
(see Figure 1). The bias current consumed by the
device during this period is only 50µA; the remaining
input current charges C2 and C3. Charging of C3 stops
when the VCC voltage reaches approximately 9.5V,
while the voltage across C2 continues rising until it
reaches the wakeup level of 24V. Once VIN exceeds
the UVLO threshold, NDRV begins switching the
MOSFET, transferring energy to the secondary and ter-
tiary outputs. If the voltage on the tertiary output builds
to higher than 10V (UVLO lower threshold), then startup
has been accomplished and sustained operation
will commence.
If VIN drops below 10V before startup is complete, then
the IC goes back into UVLO. In this case, increase the
value of C2 and/or use a MOSFET with a lower gate-
charge requirement.
Startup Time Considerations
The VIN bypass capacitor C2 supplies current immediate-
ly after wakeup. The size of C2 will determine the number
of cycles available for startup. Large values for C2 will
increase the startup time, but will also supply more gate
charge, allowing for more cycles after wakeup. If the
value of C2 is too small, VIN will drop below 10V because
MAX5021/MAX5022
Current-Mode PWM Controllers for Isolated
Power Supplies
_______________________________________________________________________________________ 5
Pin Description
PIN
SOT23 PDIP
µMAX
NAME FUNCTION
18CS
C ur r ent S ense C onnecti on for P WM Reg ul ati on and Over cur r ent P r otecti on. The cur r ent- l i m i t
com p ar ator thr eshol d i s i nter nal l y set to 0.6V .
2 7 GND Power-Supply Ground
3 6 NDRV External N-Channel MOSFET Gate Connection
43V
CC Gate Drive Supply. Internally regulated down from VIN. Decouple with a 10nF or larger
capacitor to GND.
52V
IN
IC Supply. Decouple with a 10nF or larger capacitor to GND. Connect a startup resistor
(Rs) from the input supply line to VIN. Connect to bias winding through diode rectifier.
See Typical Operating Circuit.
6 1 OPTO Optocoupler Transistor Collector Connection. Connect emitter of optocoupler to GND.
The OPTO has an internal pullup resistor with a typical value of 6.2kΩ.
—4, 5 N.C. No Connection. Do not make connections to these pins.
MAX5021/MAX5022
NDRV did not switch enough times to build up sufficient
voltage across the tertiary output to power the device.
The device will go back into UVLO and will not start. Use
a low-leakage ceramic or film capacitor for C2 and C3.
As a rule of thumb, off-line power supplies keep typical
startup times to less than 500ms even in low-line condi-
tions (85VAC input). Size the startup resistor, RS, to sup-
ply the maximum startup bias of the IC (85µA) plus the
additional current required for charging the capacitors
C2 and C3 in less than 500ms. This resistor dissipates
continuous power in normal operation, despite the fact
that it is only used during the startup sequence.
Therefore it must be chosen to provide enough current
for the low-line condition as well as have an appropriate
power rating for the high-line condition (265VAC). In
most cases, split the value into two resistors connected
in series for the required voltage of approximately
400VDC.
The typical value for C2 and C3 is 220nF. The startup
resistor, RS, provides both the maximum quiescent cur-
rent of 85µA and the charging current for C2 and C3.
Bypass capacitor C3 charges to 9.5V and C2 charges
to 24V all within the desired time period of 500ms, for
an overall average charging current of 15µA. Hence,
the startup resistor must provide a total of at least
100µA. Developing 100µA from an input voltage of
Current-Mode PWM Controllers for Isolated
Power Supplies
6 _______________________________________________________________________________________
D1
AC
L
N
G
CENTRAL SEMICONDUCTOR
CBR1-D100S
AC
L2
470µH
MAX5022
OPTO
FAIRCHILD
CNY17-3
OPTO
NOTE: ALL RESISTORS ARE 5% UNLESS OTHERWISE SPECIFIED.
CTX03-15256
T1
D2
3A, 40V
ON SEMICONDUCTOR
MBRS340T3
R6
10Ω
C4
150µF
6.3V
C7
1000pF
C6
0.1µF
C9
10µF
400V
C1
10µF
400V R3
1kΩ
1%
R4
24.9kΩ
1%
R10
10Ω
8T
3T
480µH, 60T
R1
360kΩ
R8
1.2kΩ
R2
360kΩR11
10Ω
+5V OUT
C5
0.01µF
C8
8200pF
C2
0.22µF
N1
INTERNATIONAL RECTIFIER
IRFRC20
C3
0.22µF
85VAC TO
265VAC IN
D1
250mA, 75V
CENTRAL SEMICONDUCTOR
CMPD914
R5
8.06kΩ
1%
RCS
1.78Ω
1%
R9
240kΩ
TEXAS
INSTRUMENTS
TLV431AIDBV
OPTO NDRV
U1
CS
VCC VIN
GND
RS = R1 + R2
Figure 1. Universal 5W Off-Line Standby Power Supply
0
5
15
10
20
25
TIME (ms)
VIN, VCC (V)
VCC
VIN
0 10050 150 200
VCC DROPS SLIGHTLY WHEN
NDRV BEGINS SWITCHING
IC COMES OUT OF UVLO
(WAKEUP)
VIN SUPPLIED BY TERTIARY
WINDING (NORMAL OPERATION)
VCC BYPASS CAPACITOR
FULLY CHARGED
VIN SUPPLIED BY C2
Figure 2. VIN and VCC During Startup
85VAC (corresponding to 120VDC) to the 24V wakeup
level results in a resistor value of about 1MΩ. If we
assume RSvalues between 750kΩand 1MΩ, then at
the high-line voltage of 265VAC (corresponding to
374VDC) power dissipation will be between 140mW to
190mW. A single 1/4W resistor or a series combination
of two 1/4W resistors is adequate.
Undervoltage Lockout (UVLO)
The device will attempt to start when VIN exceeds the
UVLO threshold of 24V. During startup, the UVLO cir-
cuit keeps the CPWM comparator, ILIM comparator,
oscillator, and output driver shut down to reduce cur-
rent consumption (Functional Diagram). Once VIN
reaches 24V, the UVLO circuit turns on both the CPWM
and ILIM comparators, as well as the oscillator, and
allows the output driver to switch. If VIN drops below
10V, the UVLO circuit will shut down the CPWM com-
parator, ILIM comparator, oscillator, and output driver
returning the MAX5021/MAX5022 to the startup mode.
N-Channel MOSFET Switch Driver
The NDRV pin drives an external N-channel MOSFET.
The NDRV output is supplied by the internal regulator
(VCC), which is internally set to approximately 9V. For
the universal input voltage range, the MOSFET used
must be able to withstand the DC level of the high-line
input voltage plus the reflected voltage at the primary
of the transformer. For most applications that use the
discontinuous flyback topology, this requires a MOS-
FET rated at 600V. NDRV can source/sink 150mA/
250mA peak current, thus select a MOSFET that will
yield acceptable conduction and switching losses.
Internal Oscillator
The internal oscillator switches at 1.048MHz and is
divided down to 262kHz by two D flip-flops. The
MAX5021 inverts the Q output of the last D flip-flop to
provide a duty cycle of 50% (Figure 3). The MAX5022
performs a logic NAND operation on the Q outputs of
both D flip-flops to provide a duty cycle of 75%.
Optocoupler Feedback
The MAX5021/MAX5022 do not include an internal error
amplifier and are recommended for use in optocoupler
feedback power supplies. Isolated voltage feedback is
achieved by using an optocoupler and a shunt regula-
tor as shown in the Typical Operating Circuit. The out-
put voltage set point accuracy is a function of the
accuracy of the shunt regulator and resistor divider.
When a TLV431 shunt regulator is used for output volt-
age regulation, the output voltage is set by the ratio of
R4 and R5 (Figure 1). Output voltage is given by the
following equation:
where VREF = 1.24V for the TLV431.
During normal operation, the optocoupler feedback pin
(OPTO) is pulled up through a 6.2kΩresistor to the
internal supply voltage of 5.25V. When the device is in
UVLO, OPTO is disconnected from the 5.25V regulator
and connected to ground (Functional Diagram). This
helps initial startup by reducing the current consump-
tion of the device.
Current Limit
The current limit is set by a current sense resistor, RCS,
connected between the source of the MOSFET and
ground. The CS input has a voltage trip level (VCS) of
600mV. Use the following equation to calculate the
value of RCS:
where IPRI 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 dri-
ver (NDRV) will quickly terminate the current ON-cycle,
typically within 60ns. In most cases a small RC filter will
be required to filter out the leading-edge spike on the
sense waveform. Set the corner frequency at a
few MHz.
Applications Information
Universal Off-Line Power Supply
Figure 1 shows the design of a 5V/1A isolated power
supply capable of operating from a line voltage of
85VAC to 265VAC. This circuit is implemented in the
MAX5022EVKIT.
RV
I
CS CS
PRI
=
VV R
R
OUT REF
=×+
14
5
MAX5021/MAX5022
Current-Mode PWM Controllers for Isolated
Power Supplies
_______________________________________________________________________________________ 7
OSCILLATOR
1.048MHz
DQ
Q
DQ
Q
262kHz WITH 50%
(MAX5021)
262kHz WITH 75%
(MAX5022)
Figure 3. Internal Oscillator
MAX5021/MAX5022
WARNING! DANGEROUS AND LETHAL VOLTAGES
ARE PRESENT IN OFF-LINE CIRCUITS! USE
EXTREME CAUTION IN THE CONSTRUCTION,
TESTING, AND USE OF OFF-LINE CIRCUITS.
Isolated Telecom Power Supply
Figure 4 shows a -48VDC telecom power supply capa-
ble of generating an isolated +5V output.
Layout Recommendations
All printed circuit board traces carrying switching cur-
rents must be kept as short as possible, and the cur-
rent loops they form must be minimized. The pins of the
SOT23 package have been placed to allow simple
interfacing to the external MOSFET. The order of these
pins directly corresponds to the order of a TO-220 or
similar package MOSFET.
For universal AC input design all applicable safety reg-
ulations must be followed. Off-line power supplies may
require UL, VDE, and other similar agency approvals.
These agencies can be contacted for the latest layout
and component rules.
Typically there are two sources of noise emission in a
switching power supply: high di/dt loops and high dv/dt
surfaces. For example, traces that carry the drain cur-
rent often form high di/dt loops. Similarly the heatsink of
the MOSFET presents a dv/dt source, thus the surface
area of the heatsink must be minimized as much
as possible.
To achieve best performance, a star ground connection
is recommended to avoid ground loops. For example,
the ground returns for the power-line input filter, power
MOSFET switch, and sense resistor should be routed
separately through wide copper traces to meet at a sin-
gle system ground connection.
Chip Information
TRANSISTOR COUNT: 519
PROCESS: BiCMOS
Current-Mode PWM Controllers for Isolated
Power Supplies
8 _______________________________________________________________________________________
MAX5022
-36VDC TO -72VDC IN
T1
RSVOUT
C2
C3
OPTO NDRV
CS
VCC VIN
GND
Figure 4. -48VDC Input to +5V Output
MAX5021/MAX5022
Current-Mode PWM Controllers for Isolated
Power Supplies
_______________________________________________________________________________________ 9
Functional Diagram
Q
S
R
OSCILLATOR
262kHz*
0.75V
(INTERNAL 5.25V
SUPPLY)
DRIVER
OPTO
CS
NDRV
REFERENCE
1.25V
IN
GND
REGULATOR
IN VCC
VIN VCC
VL
6.2kΩ
UVLO
24V
10V
REG_OK
GND
*MAX5021: 50% MAXIMUM DUTY CYCLE
MAX5022: 75% MAXIMUM DUTY CYCLE
CPWM
ILIM
VOPWM
VCS
0.6V
MAX5021/MAX5022
Current-Mode PWM Controllers for Isolated
Power Supplies
10 ______________________________________________________________________________________
Package Information
PACKAGE OUTLINE, 8L uMAX/uSOP
1
1
21-0036 J
REV.DOCUMENT CONTROL NO.APPROVAL
PROPRIETARY INFORMATION
TITLE:
6LSOT.EPS
MAX5021/MAX5022
Current-Mode PWM Controllers for Isolated
Power Supplies
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
© 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
Package Information (continued)
PDIPN.EPS
