MAX5053BEUA+ ,Current-Mode PWM Controllers with an Error Amplifier for Isolated/Nonisolated Power SuppliesFeaturesThe MAX5052/MAX5053 current-mode PWM controllers ♦ Available in a Tiny 8-Pin µMAX Packageco ..
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MAX5054AATA+T ,4A, 20ns, Dual MOSFET DriversApplicationsRANGE PACKAGE MARKPower MOSFET Switching Motor ControlMAX5054AATA+ -40°C to +125°C 8 TD ..
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MAX9311ECJ+ ,1:10 Differential LVPECL/LVECL/HSTL Clock and Data DriversApplicationsMAX9313ECJ -40°C to +85°C 32 LQFP (7mm ✕ 7mm)Precision Clock DistributionMAX9313EGJ* -4 ..
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MAX5053BEUA+-MAX5053BEUA+T
Current-Mode PWM Controllers with an Error Amplifier for Isolated/Nonisolated Power Supplies
General DescriptionThe MAX5052/MAX5053 current-mode PWM controllers
contain all the control circuitry required for the design of
wide-input-voltage isolated and nonisolated power
supplies. The MAX5052 is well suited for universal input
(rectified 85VAC to 265VAC) or telecom (-36VDC to
-72VDC) power supplies. The MAX5053 is well suited for
low-input-voltage (10.8VDC to 24VDC) power supplies.
The MAX5052/MAX5053 contain an internal error ampli-
fier that regulates the tertiary winding output voltage.
This implements a primary-side regulated, isolated
power supply, eliminating the need for an optocoupler.
An input undervoltage lockout (UVLO) is provided for
programming the input-supply start voltage and to
ensure proper operation during brownout conditions.
The input-supply start voltage is externally programma-
ble with a voltage-divider. To shutdown the device, the
UVLO pin is pulled low. Internal digital soft-start
reduces output voltage overshoot. The internal thermal
shutdown circuit protects the device in the event the
junction temperature exceeds +130°C.
The MAX5052 has an internal bootstrap UVLO with
large hysteresis that requires a minimum voltage of
23.6V for startup. The MAX5053 does not have the
internal bootstrap UVLO and can be biased directly
from a minimum voltage of 10.8V.
The 262kHz switching frequency is internally trimmed to
±12% accuracy; this allows the optimization of the
magnetic and filter components resulting in compact,
cost-effective power supplies. The MAX5052A/
MAX5053A are offered with a 50% maximum duty-cycle
limit. The MAX5052B/MAX5053B are offered with a 75%
maximum duty-cycle limit. These devices are available
in 8-pin µMAX packages and operate over the -40°C to
+85°C temperature range.
Applications
FeaturesAvailable in a Tiny 8-Pin µMAX PackageCurrent-Mode Control50W Output PowerUniversal Offline Input Voltage Range
Rectified 85VAC to 265VAC (MAX5052)VINDirectly Driven from 10.8V to 24V Input
(MAX5053)Digital Soft-StartProgrammable Input Startup VoltageInternal Bootstrap UVLO with Large Hysteresis
(MAX5052)Internal Error Amplifier with 1% Accurate
ReferenceThermal Shutdown45µA (typ) Startup Supply Current1.4mA (typ) Operating Supply CurrentFixed Switching Frequency of 262kHz ±12%50% Maximum Duty-Cycle Limit
(MAX5052A/MAX5053A)75% Maximum Duty-Cycle Limit
(MAX5052B/MAX5053B)60ns Cycle-by-Cycle Current-Limit Response Time
MAX5052/MAX5053
Current-Mode PWM Controllers with an Error
Amplifier for Isolated/Nonisolated Power Supplies
Ordering Information19-2590; Rev 1; 11/03
Functional Diagram/Typical Operating Circuit/Selector
PARTTEMP RANGEPIN-PACKAGE
MAX5052AEUA-40°C to +85°C8 µMAX
MAX5052BEUA-40°C to +85°C8 µMAX
MAX5053AEUA-40°C to +85°C8 µMAX
MAX5053BEUA-40°C to +85°C8 µMAX
NDRV
GNDCS
VIN
VCCFB
COMP
UVLO/EN
µMAX
TOP VIEW
MAX5052
MAX5053
Pin Configuration
Warning:The MAX5052/MAX5053 are designed to work with
high voltages. Exercise caution.
Universal Input AC
Power Supplies
Isolated Telecom Power
Supplies
Networking Systems
Computer Systems/
Servers
Industrial Power
Conversion
Isolated Keep-Alive
Circuits
12V Boost Regulators
12V SEPIC Regulators
EVALUATION KIT
AVAILABLE
MAX5052/MAX5053
Current-Mode PWM Controllers with an Error
Amplifier for Isolated/Nonisolated Power Supplies
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VIN= +12V (for MAX5052, VINmust first be brought up to 23.6V for startup), 10nF bypass capacitors at VINand VCC, CNDRV= 0,
VUVLO= +1.4V, VFB= +1.0V, VCOMP= floating, VCS= 0V, typical values are measured at TA= +25°C, TA= -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.
VINto GND.............................................................-0.3V to +30V
VCCto GND............................................................-0.3V to +13V
FB, COMP, UVLO, CS to GND.................................-0.3V to +6V
NDRV to GND.............................................-0.3V to (VCC+ 0.3V)
Continuous Power Dissipation (TA= +70°C)
8-Pin µMAX (derate 4.5mW/°C above +70°C)..............362mW
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range ............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
UNDERVOLTAGE LOCKOUT/STARTUPBootstrap UVLO Wake-Up LevelVSUVRVIN rising (MAX5052 only)19.6821.623.60V
Bootstrap UVLO Shutdown LevelVSUVFVIN falling (MAX5052 only)9.059.7410.43V
UVLO/EN Wake-Up ThresholdVULR2UVLO/EN rising1.1881.281.371V
UVLO/EN Shutdown ThresholdVULF2UVLO/EN falling1.1681.231.291V
UVLO/EN Input CurrentIUVLOTJ = +125°C25nA
UVLO/EN Hysteresis50mV
VIN Supply Current In
Undervoltage LockoutISTARTVIN = +19V, for MAX5052 only when in
bootstrap UVLO4590µA
VIN RangeVIN10.824V
tEXTRUVLO/EN steps up from +1.1V to +1.4V12UVLO/EN Propagation DelaytEXTFUVLO/EN steps down from +1.4V to +1.1V1.8µs
tBUVRVIN steps up from +9V to +24V5Bootstrap UVLO Propagation
DelaytBUVFVIN steps down from +24V to +9V1µs
INTERNAL SUPPLYVCC Regulator Set PointVCCSPVIN = +10.8V to +24V, sinking 1µA to 20mA
from VCC710.5V
VIN Supply Current After StartupIINVIN = +24V1.42.5mA
Shutdown Supply CurrentUVLO/EN = low90µA
GATE DRIVERRON(LOW)Measured at NDRV sinking, 100mA24Driver Output ImpedanceRON(HIGH)Measured at NDRV sourcing, 20mA412Ω
Driver Peak Sink Current1A
Driver Peak Source Current0.65A
PWM COMPARATORComparator Offset VoltageVOPWMVCOMP - VCS1.151.381.70V
CS Input Bias CurrentICSVCS = 0V-2+2µA
Comparator Propagation DelaytPWMVCS = +0.1V60ns
Minimum On-TimetON(MIN)150ns
MAX5052/MAX5053
Current-Mode PWM Controllers with an Error
Amplifier for Isolated/Nonisolated Power Supplies
Note 1:All devices are 100% tested at TA= +85°C. All limits over temperature are guaranteed by characterization.
Note 2:VREFis measured with FB connected to the COMP pin (see Functional Diagram).
Note 3:The MAX5052 is intended for use in universal input power supplies. The internal clamp circuit is used to prevent the boot-
strap capacitor (C1 in Figure 1) from charging to a voltage beyond the absolute maximum rating of the device when
EN/UVLO is low. The maximum current to VIN(hence to clamp) when UVLO is low (device in shutdown) must be externally
limited to 2mA, max. Clamp currents higher than 2mA may result in clamp voltage higher than 30V, thus exceeding the
absolute maximum rating for VIN. For the MAX5053, do not exceed the 24V maximum operating voltage of the device.
ELECTRICAL CHARACTERISTICS (continued)(VIN= +12V (for MAX5052, VINmust first be brought up to 23.6V for startup), 10nF bypass capacitors at VINand VCC, CNDRV= 0,
VUVLO= +1.4V, VFB= +1.0V, VCOMP= floating, VCS= 0V, typical values are measured at TA= +25°C, TA= -40°C to + 85°C, unless
otherwise noted.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
CURRENT-LIMIT COMPARATORCurrent-Limit Trip ThresholdVCS262291320mV
CS Input Bias CurrentICSVCS = 0V-2+2µA
Propagation Delay From
Comparator Input to NDRVtPWM50mV overdrive60ns
Switching FrequencyfSW230262290kHz
MAX505_A5050.5Maximum Duty CycleDMAXMAX505_B7576%
VIN CLAMP VOLTAGEVIN Clamp VoltageVINC2mA sink current, MAX5052 only (Note 3)24.126.129.0V
ERROR AMPLIFIERVoltage GainRLOAD = 100kΩ80dB
Unity-Gain BandwidthRLOAD = 100kΩ, CLOAD = 200pF2MHz
Phase MarginRLOAD = 100kΩ, CLOAD = 200pF65degrees
FB Input Offset Voltage3mV
High2.23.5COMP Pin Clamp VoltageLow0.41.1V
Source Current0.5mA
Sink Current0.5mA
Reference VoltageVREF(Note 2)1.2181.2301.242V
Input Bias Current50nA
COMP Short-Circuit Current8mA
THERMAL SHUTDOWNThermal-Shutdown Temperature130°C
Thermal Hysteresis25°C
DIGITAL SOFT-STARTSoft-Start Duration15,872clock
cycles
Reference Voltage Steps During
Soft-Start31steps
Reference Voltage Step40mV
MAX5052/MAX5053
Current-Mode PWM Controllers with an Error
Amplifier for Isolated/Nonisolated Power Supplies
Typical Operating Characteristics(UVLO = +1.4V, VFB= +1V, VCOMP= floating, VCS= 0V, TA= +25°C, unless otherwise noted.)
BOOTSTRAP UVLO WAKE-UP LEVEL
vs. TEMPERATUREMAX5052 toc01
TEMPERATURE (°C)
(V)40200-20
MAX5052 VIN RISING
BOOTSTRAP UVLO SHUTDOWN LEVEL
vs. TEMPERATUREMAX5052 toc02
TEMPERATURE (°C)
(V)40200-20
MAX5052 VIN FALLING
UVLO/EN WAKE-UP THRESHOLD
vs. TEMPERATUREMAX5052 toc03
TEMPERATURE (°C)
UVLO/EN (V)40200-20
UVLO/EN RISING
UVLO/EN SHUTDOWN THRESHOLD
vs. TEMPERATUREMAX5052 toc04
TEMPERATURE (°C)
UVLO/EN (V)40200-20
UVLO/EN FALLING
VIN SUPPLY CURRENT IN UNDERVOLTAGE
LOCKOUT vs. TEMPERATUREMAX5052 toc05
TEMPERATURE (°C)
START40200-20
VIN = 19V
MAX5052 WHEN IN BOOTSTRAP UVLO
MAX5053 WHEN UVLO/EN IS LOW
VIN SUPPLY CURRENT AFTER STARTUP
vs. TEMPERATUREMAX5052 toc06
TEMPERATURE (°C)
IIN
(mA)40200-20
VIN = 24V
VCC REGULATOR SET POINT
vs. TEMPERATUREMAX5052 toc07
TEMPERATURE (°C)
(V)40200-20
VIN = 19V
NO LOAD
NDRV OUTPUT IS NOT
SWITCHING, VFB = 1.5V
NDRV OUTPUT IS
SWITCHING
VCC REGULATOR SET POINT
vs. TEMPERATUREMAX5052 toc08
TEMPERATURE (°C)
(V)40200-20
VIN = 10.8V
10mA LOAD
20mA LOAD
CURRENT-LIMIT TRIP THRESHOLD
vs. TEMPERATUREMAX5052 toc09
TEMPERATURE (°C)
CURRENT-LIMIT TRIP THRESHOLD (mV)40200-20
+3σ
-3σ
MEAN
TOTAL NUMBER OF
DEVICES = 100
MAX5052/MAX5053
Current-Mode PWM Controllers with an Error
Amplifier for Isolated/Nonisolated Power Supplies
CURRENT-LIMIT TRIP THRESHOLDMAX5052 toc10
CURRENT-LIMIT TRIP THRESHOLD (mV)
PERCENTAGE OF UNITS (%)
TOTAL NUMBER OF
DEVICES = 200
SWITCHING FREQUENCY
vs. TEMPERATUREMAX5052 toc11
TEMPERATURE (°C)
SWITCHING FREQUENCY (kHz)40200-20
+3σ
-3σ
MEAN
TOTAL NUMBER OF
DEVICES = 100
SWITCHING FREQUENCYMAX5052 toc12
SWITCHING FREQUENCY (kHz)
PERCENTAGE OF UNITS (%)
TOTAL NUMBER OF
DEVICES = 200
PROPAGATION DELAY FROM CURRENT-LIMIT
COMPARATOR INPUT TO NDRV vs. TEMPERATUREMAX5052 toc13
TEMPERATURE (°C)
tPWM
(ns)40200-20
UVLO/EN PROPAGATION DELAY
vs. TEMPERATURE
MAX5052 toc14
TEMPERATURE (°C)
UNDERVOLTAGE LOCKOUT DELAY (40200-20
UVLO/EN RISING
UVLO/EN FALLING
REFERENCE VOLTAGE
vs. TEMPERATUREMAX5052 toc15
TEMPERATURE (°C)
REFERENCE VOLTAGE (V)40200-20
VIN = 12V
INPUT CURRENT
vs. INPUT CLAMP VOLTAGEMAX5052 toc16
INPUT VOLTAGE (V)
INPUT CURRENT (mA)
INPUT CLAMP VOLTAGE
vs. TEMPERATURE
MAX5052 toc17
TEMPERATURE (°C)
INPUT CLAMP VOLTAGE (V)40200-20
IIN = 2mA
NDRV OUTPUT IMPEDANCE
vs. TEMPERATUREMAX5052 toc18
TEMPERATURE (°C)40200-20
VIN = 24V
SINKING 100mA
Typical Operating Characteristics (continued)(UVLO = +1.4V, VFB= +1V, VCOMP= floating, VCS= 0V, TA= +25°C, unless otherwise noted.)
MAX5052/MAX5053
Detailed DescriptionThe MAX5052/MAX5053 are current-mode PWM con-
trollers that have been specifically designed for use in
isolated and nonisolated power-supply applications. A
bootstrap UVLO with a large hysteresis (11.9V), very
low startup current, and low operating current result in
efficient universal-input power supplies. In addition to
the internal bootstrap UVLO, these devices also offer
programmable input startup voltage programmed
through the UVLO/EN pin. This feature is useful in pre-
venting the power supply from entering a brownout
condition, in case the input voltage drops below its
minimum value. This is important since switching power
supplies increases their input supply current as the
input voltage drops in order to keep the output power
constant. The MAX5052 is well suited for universal input
(rectified 85VAC to 265VAC) or telecom (-36VDC to
-72VDC) power supplies. The MAX5053 is well suited for
low-input-voltage (10.8VDC to 24VDC) power supplies.
Power supplies designed with the MAX5052 use a
high-value startup resistor, R1, that charges a reservoir
capacitor, C1 (see Figure 1). During this initial period,
while the voltage is less than the internal bootstrap
UVLO threshold, the device typically consumes only
45µA of quiescent current. This low startup current and
the large bootstrap UVLO hysteresis helps to minimize
Current-Mode PWM Controllers with an Error
Amplifier for Isolated/Nonisolated Power Supplies
Pin Description
NDRV OUTPUT IMPEDANCE
vs. TEMPERATUREMAX5052 toc19
TEMPERATURE (°C)40200-20
VIN = 24V
SOURCING 20mA
ERROR AMP OPEN-LOOP GAIN
AND PHASE vs. FREQUENCYMAX5052 toc20
FREQUENCY (Hz)
GAIN (dB)
10M1M10k1k100k101001
PHASE (DEGREES)
0.1100M
GAIN
PHASE
Typical Operating Characteristics (continued)(UVLO = +1.4V, VFB= +1V, VCOMP= floating, VCS= 0V, TA= +25°C, unless otherwise noted.)
PINNAMEFUNCTIONUVLO/ENExternally Programmable Undervoltage Lockout. UVLO programs the input start voltage. Connect UVLO to
GND to disable the device.
2FBError-Amplifier Inverting InputCOMPError-Amplifier Output
4CSCurrent-Sense Connection for PWM Regulation and Overcurrent Protection. Connect to high side of sense
resistor. An RC filter may be necessary to eliminate leading-edge spikes.GNDPower-Supply GroundNDRVExternal N-Channel MOSFET Gate Connection
7VCCGate-Drive Supply. Internally regulated down from VIN. Decouple with a 10nF or larger capacitor to GND.
8VIN
IC Supply. Decouple with a 10nF or larger capacitor to GND. For bootstrapped operation (MAX5052)
connect a startup resistor from the input supply line to VIN. Connect the bias winding supply to this point as
well (see the Typical Operating Circuit). For the MAX5053, connect VIN directly to 10.8V to 24V supply.
the power dissipation across R1 even at the high end of
the universal AC input voltage (265VAC).
The MAX5052/MAX5053 include a cycle-by-cycle cur-
rent limit that turns off the gate drive to the external
MOSFET during an overcurrent condition. When using
the MAX5052 in the bootstrapped mode (if the power-
supply output is shorted), the tertiary winding voltage
drops below the 10V threshold causing the UVLO to
turn off the gate drive to the external power MOSFET.
This reinitiates a startup sequence with soft-start.
MAX5052/MAX5053
Undervoltage Lockout The MAX5052/MAX5053 have an input voltage
UVLO/EN pin. The threshold for this UVLO is 1.28V.
Before any operation can commence, the voltage on
this pin has to exceed 1.28V. The UVLO circuit keeps
the CPWM comparator, ILIM comparator, oscillator,
and output driver shut down to reduce current con-
sumption (see the Functional Diagram).
Use this UVLO function to program the input-supply
start voltage. For example, a reasonable start voltage
for a 36V to 72V telecom range might be set at 34V.
Calculate the divider resistor values, R2 and R3 (see
Figure 1) by using the following formulas:
The value of R3 is calculated to minimize the voltage-
drop error across R2 as a result of the input bias cur-
rent of the UVLO/EN pin. VULR2= 1.28V, IUVLO= 50nA
(max). VINis the value of the input-supply voltage
where the power supply must start.
where IUVLOis the UVLO/EN pin input current (50nA),
and VULR2is the UVLO/EN wake-up threshold.
MAX5052 Bootstrap
Undervoltage Lockout In addition to the externally programmable UVLO func-
tion offered in both the MAX5052 and MAX5053, the
MAX5052 has an additional internal bootstrap UVLO
that is very useful when designing high-voltage power
supplies (see the Functional Diagram). This allows the
device to bootstrap itself during initial power-up. The
MAX5052 attempts to start when VINexceeds the boot-
strap UVLO threshold of 21.6V.
During startup, the UVLO circuit keeps the CPWM com-
parator, ILIM comparator, oscillator, and output driver
shut down to reduce current consumption. Once VIN
reaches 21.6V, the UVLO circuit turns on both the CPWM
and ILIM comparators, as well as the oscillator, and
allows the output driver to switch. If VINdrops below
9.7V, the UVLO circuit will shut down the CPWM com-
parator, ILIM comparator, oscillator, and output driver
returning the MAX5052/MAX5053 to the startup mode.
MAX5052 Startup OperationNormally VINis derived from a tertiary winding of the
transformer. However, at startup there is no energy
delivered through the transformer, hence, a special
bootstrap sequence is required. Figure 2 shows the
voltages on VINand VCCduring startup. Initially, both
VINand VCCare 0V. After the line voltage is applied,
C1 charges through the startup resistor, R1, to an inter-
mediate voltage. At this point, the internal regulator
begins charging C2 (see Figure 1). The MAX5052 uses
only 45µA of the current supplied by R1, and the
remaining input current charges C1 and C2. The charg-
ing of C2 stops when the VCCvoltage reaches approxi-
mately 9.5V, while the voltage across C1 continues
rising until it reaches the wake-up level of 21.6V. Once
VINexceeds the bootstrap UVLO threshold, NDRV
begins switching the MOSFET and transfers energy to
the secondary and tertiary outputs. If the voltage on the
tertiary output builds to higher than 9.9V (the bootstrap
UVLO lower threshold), then startup has been accom-
plished and sustained operation commences.VVRINULR
ULR2− VVV
ULRIN
UVLOINULR500≅×()−
MAX5052/MAX5053
Current-Mode PWM Controllers with an Error
Amplifier for Isolated/Nonisolated Power SuppliesVIN
VCC
COMP
GND
NDRV
UVLO/EN
VSUPPLYVOUTC3R4
MAX5052
Figure 1. Nonisolated Power Supply with Programmable Input-
Supply Start Voltage
