MAX5003EEE+ ,High-Voltage PWM Power-Supply Controllerfeatures and building blocks need-♦ Internal High-Voltage Startup Circuited for a cost-effective fl ..
MAX5003EEE+T ,High-Voltage PWM Power-Supply ControllerApplicationsPin ConfigurationTelecommunication Power SuppliesISDN Power SuppliesTOP VIEW+42V Automo ..
MAX5003EEE+T ,High-Voltage PWM Power-Supply ControllerFeaturesThe MAX5003 high-voltage switching power-supply♦ Wide Input Range: 11V to 110Vcontroller ha ..
MAX5003ESE ,High-Voltage PWM Power-Supply ControllerApplicationsPin ConfigurationTelecommunication Power SuppliesISDN Power SuppliesTOP VIEW+42V Automo ..
MAX5003ESE+ ,High-Voltage PWM Power-Supply ControllerELECTRICAL CHARACTERISTICS(V+ = V = V = +12V, V = 2V, V = 0, R = R = 200kΩ, T = T to T , unless oth ..
MAX5005BCUB ,150mA USB LDO Regulators with ±15kV TVS and µP ResetApplicationsMAX5007_CUB* 0°C to +70°C 10 µMAXHighUSB Peripherals*Insert “A” for a 7.5% reset thresh ..
MAX9140EXK-T ,40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply ComparatorsApplicationsMAX9141EKA-T -40°C to +85°C 8 SOT23-8 AAFDLine ReceiversMAX9141ESA -40°C to +85°C 8 SO ..
MAX9142ESA ,40ns / Low-Power / 3V/5V / Rail-to-Rail Single-Supply ComparatorsApplicationsMAX9141EKA-T -40°C to +85°C 8 SOT23-8 AAFDLine ReceiversMAX9141ESA -40°C to +85°C 8 SO ..
MAX9142ESA+T ,40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply Comparatorsfeatures latch enable and device shutdown. These devices ● Rail-to-Rail Input Voltage Rangecombine ..
MAX9144EUD ,40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply ComparatorsELECTRICAL CHARACTERISTICS(V = 5V, V = 0, SHDN = LE = V (MAX9141 only), C = 15pF, T = T to T , unle ..
MAX9150EUI ,Low-Jitter / 10-Port LVDS Repeaterapplications(Deterministic and Random)that require high-speed data or clock distribution while 100 ..
MAX9150EUI ,Low-Jitter / 10-Port LVDS RepeaterELECTRICAL CHARACTERISTICS(V = +3.0V to +3.6V, R = 50Ω ±1%, V = 0.1V to 1.0V, V = V / 2 to 2.4V - ..
MAX5003CEE+-MAX5003CSE+-MAX5003EEE+-MAX5003EEE+T-MAX5003ESE+
High-Voltage PWM Power-Supply Controller
General DescriptionThe MAX5003 high-voltage switching power-supply
controller has all the features and building blocks need-
ed for a cost-effective flyback and forward voltage-
mode control converter. This device can be used to
design both isolated and nonisolated power supplies
with multiple output voltages that operate from a wide
range of voltage sources. It includes a high-voltage
internal start-up circuit that operates from a wide 11V to
110V input range. The MAX5003 drives an external N-
channel power MOSFET and has a current-sense pin
that detects overcurrent conditions and turns off the
power switch when the current-limit threshold is
exceeded. The choice of external power MOSFET and
other external components determines output voltage
and power.
The MAX5003 offers some distinctive advantages: soft-
start, undervoltage lockout, external frequency synchro-
nization, and fast input voltage feed-forward. The
device is designed to operate at up to 300kHz switch-
ing frequency. This allows use of miniature magnetic
components and low-profile capacitors. Undervoltage
lockout, soft-start, switching frequency, maximum duty
cycle, and overcurrent protection limit are all adjustable
using a minimum number of external components. In
systems with multiple controllers, the MAX5003 can be
externally synchronized to operate from a common sys-
tem clock.
Warning:The MAX5003 is designed to operate with
high voltages. Exercise caution.
The MAX5003is available in 16-pin SO and QSOP pack-
ages. An evaluation kit (MAX5003EVKIT) is also available.
ApplicationsTelecommunication Power Supplies
ISDN Power Supplies
+42V Automobile Systems
High-Voltage Power-Supply Modules
Industrial Power Supplies
FeaturesWide Input Range: 11V to 110VInternal High-Voltage Startup CircuitExternally Adjustable Settings
Output Switch Current Limit
Oscillator Frequency
Soft-Start
Undervoltage Lockout
Maximum Duty CycleLow External Component CountExternal Frequency SynchronizationPrimary or Secondary RegulationInput Feed-Forward for Fast Line-Transient
ResponsePrecision ±2.5% Reference over Rated
Temperature RangeThermal Shutdown
MAX5003
High-Voltage PWM
Power-Supply ControllerVDD
VCC
NDRV
PGND
AGND
MAXTON
TOP VIEW
MAX5003
QSOP/Narrow SOINDIV
REF
FREQ
CON
COMP
19-1555; Rev 2; 4/02
PARTMAX5003CEE
MAX5003CSE
MAX5003EEE-40°C to +85°C
0°C to +70°C
0°C to +70°C
TEMP. RANGEPIN-PACKAGE16 QSOP
16 Narrow SO
16 QSOP
EVALUATION KITAVAILABLE
Note: Dice are designed to operate over a -40°C to +140°C junc-tion temperature (Tj) range, but are tested and guaranteed at = +25°C.
Pin Configuration
Ordering InformationMAX5003ESE-40°C to +85°C16 Narrow SO
MAX5003C/D(Note A)Dice
MAX5003
High-Voltage PWM
Power-Supply Controller
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(V+ = VES= VDD= +12V, VINDIV= 2V, VCON = 0, RFREQ= RMAXTON= 200kΩ, TA= TMINto TMAX, unless otherwise noted. Typical
values are at TA= +25°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.
V+ to GND............................................................-0.3V to +120V
ES to GND..............................................................-0.3V to +40V
VDDto GND............................................................-0.3V to +19V
VCCto GND.........................................................-0.3V to +12.5V
MAXTON, COMP, CS, FB, CON to GND..................-0.3V to +8V
NDRV, SS, FREQ to GND...........................-0.3V to (VCC+ 0.3V)
INDIV, REF to GND.................................................-0.3V to +4.5V
VCC, VDD, V+, ES Current................................................±20mA
NDRV Current, Continuous...............................................±25mA
NDRV Current, ≤1µs.............................................................±1A
CON and REF Current......................................................±20mA
All Other Pins....................................................................±20mA
Continuous Power Dissipation (TA= +70°C)
16-Pin SO (derate 9.5mW/°C above +70°C)...............762mW
16-Pin QSOP (derate 8.3mW/°C above +70°C)..........667mW
Maximum Junction Temperature (TJ)..............................+150°C
Operating Temperature Ranges
MAX5003C_E ....................................................0°C to +70°C
MAX5003E_E..................................................-40°C to +85°C
Operating Junction Temperature (TJ) .............................+125°C
16-Pin SO θJA.................................................................105°C/W
16-Pin QSOP θJA............................................................120°C/W
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
IREF = 0 to 1mA
No load
V+ = VES, VDD= 18.75
INDRV= 50 mA
VINDIV= 0, V+ = 110V, VES= VDD=
unconnected
INDRV= 50 mA
VNDRV= VCC
VNDRV= 0, VCCsupported by VCCcapacitor
V+ = 36V, ES = unconnected,
VDD= 18.75V
VCCfalling
V+ = 36V, IV+< 75µA,
ES = unconnected
V+ = VES= 36V, INDRV= 7.5mA
V+ = 110V, VDD= unconnected
V+ = 36V, IDD= 0 to 7.5mA,
ES = unconnected520ΔVREFREF Voltage Regulation2.9053.0003.098VREFREF Output Voltage1ROLNDRV Resistance Low412ROHNDRV Resistance High1000 Peak Sink Current570Peak Source Current6.3VCCLOVCCUndervoltage
Lockout Voltage
VCCVCCOutput Voltage1.2IDD3575I+Shutdown Current
Supply Current7.41210.75VTOVDDRegulator Turn-Off Voltage10.7518.75VDDVDDInput Voltage Range2510.836VESIESInput Voltage (Note 1)36VESOESOutput Voltage99.7510.5VDDVDDOutput Voltage
CONDITIONSUNITSMINTYPMAXSYMBOL PARAMETERVDD= unconnected, V+ = VES, INDRV= 7.5mA110V+V+ Input Voltage (Note 1)ES= VDD= uncon-
nected
REFERENCE
OUTPUT DRIVER
CHIP SUPPLY (VCC)
PREREGULATOR/STARTUP
SUPPLY CURRENTINDRV= 2mA
INDRV= 5mA
MAX5003
High-Voltage PWM
Power-Supply Controller
ELECTRICAL CHARACTERISTICS (continued)(V+ = VES= VDD= +12V, VINDIV= 2V, VCON = 0, RFREQ= RMAXTON= 200kΩ, TA= TMIN to TMAX, unless otherwise noted. Typical
values are at TA= +25°C.)
(Note 2)
VFREQ= 5V, VCON= 3.0V
VCON= 3.0V
VCON= 3.0V
From end of blanking time 25mV overdrive
0 < VCS< 0.1V
VINDIV= 1.28V
FB = COMP, VCON= 1.5V
V+ = VES= VDD=
10.8V and 18.75V
At COMP
At COMP
ICOMP= 5µA; VCOMP= 0.5V, 2.5V
RLOAD= 200kΩ, CLOAD= 100pF
AVOL= 1V/V, CLOAD= 100pF
VFB= 1.5V
kHz2001200fFREQFREQ Range813tEXTExternal Oscillator Maximum
Low Time1IOLFREQ Output Low2.7VIHFREQ Input High0.8VILFREQ Input Low-10.01+1INDIV Bias Current125VHYSTINDIV Hysteresis
1.231.321.45V1.151.201.25VINDIVLOINDIV Undervoltage Lockout
ppm/°C100TCFBFB VSETTempco-10.1+1IFBFB Bias Current70tBCS Blanking Time240tD-1+1ICSCS Input Bias Current
Overcurrent Delay1.4481.4851.522VSETFB Regulation Voltage3.00VCOMPHOutput Clamp High0.25VCOMPLOutput Clamp Low6080AVVoltage Gain
MHz1.2BWUnity-Gain Bandwidth
degrees65 φPhase Margin
fS = 1/4 fFREQ150 FREQ HI/LO Pulse Width
kHz50300fSFrequency Range
CONDITIONSUNITS MINTYPMAXSYMBOLPARAMETERSVFREQ= 1.5V
VFREQ= 01IOLFREQ Output Current Low300IOHFREQ Output Current High
kHz80100120Oscillator Frequency50500RFREQFREQ Resistor Range
VINDIV= 1.25V%75Maximum Programmable
Duty Cycle
VCON= 1.25VmV80100120VCSCS Threshold Voltage
MAXIMUM DUTY CYCLE(MAXTON)
MAIN OSCILLATOR—INTERNAL MODE
MAIN OSCILLATOR—EXTERNAL MODE
UNDERVOLTAGE LOCKOUT
FEEDBACK INPUT AND SET POINT
ERROR AMPLIFIER
CURRENT LIMITVINDIVfalling
VINDIVrising
FB SET-POINT VOLTAGE CHANGE
vs. TEMPERATURE
MAX5003-01
TEMPERATURE (°C)
FB SET-POINT VOLTAGE CHANGE (%)
FB SET-POINT VOLTAGE CHANGE
vs. SUPPLY VOLTAGE
MAX5003-02
VDD (V)
FB SET-POINT VOLTAGE CHANGE (%)
SWITCHING FREQUENCY CHANGE
vs. TEMPERATURE
MAX5003-03
TEMPERATURE (°C)
FREQUENCY CHANGE (%)
Typical Operating Characteristics(VDD= +12V, RFREQ= 200kΩ, RMAXTON= 200kΩ, TA= +25°C, unless otherwise noted.)
MAX5003
High-Voltage PWM
Power-Supply Controller
ELECTRICAL CHARACTERISTICS (continued)(V+ = VES =VDD= +12V, VINDIV= 2V, VCON= 0, RFREQ= RMAXTON= 200kΩ, TA= TMINto TMAX, unless otherwise noted. Typical
values are at TA= +25°C.)
Note 1:See the Typical Operating Characteristicsfor preregulator current-to-voltage characteristics.
Note 2:Maximum time FREQ can be held below VIL and still remain in external mode.
Note 3:Feed-forward Ratio = Duty cycle at (VINDIV= 1.5V)/Duty cycle at (VINDIV= 1.875V)
Note 4:Occurs at start-up and until VREFis valid.
CONDITIONSUNITS MINTYPMAXSYMBOLPARAMETERSMinimum On-Time200ns
SS Source CurrentVSS= 0.5V, VDD= unconnected, VCON= 1.5V3.45.59µA
SS Sink CurrentVSS = 0.4V (Note 4)10mA
SS Time0.45s/µF
CON Bias CurrentICONVCON= 0.5V and 2.5V -10.011µA
RMAXTON = 200kΩ, VINDIV= 1.25Vµs7.5tONMaximum On-Time Range
VINDIV= 1.875VV0.480.50.53RAMP Voltage Low2.5RAMP Voltage High
VINDIVstepped from 1.5V to 1.875V, VCON=
3.0V (Note 3)0.720.80.88Input Voltage Feed Forward
Ratio50500RMAXTONMAXTON Resistor Range
PWM COMPARATOR
SOFT-START
PWM OSCILLATORThermal Shutdown Temperature150°C
Thermal Hysteresis20°C
THERMALSHUTDOWN
MAX5003
High-Voltage PWM
Power-Supply ControllerV+ INPUT CURRENT vs. VOLTAGE
MAX5003-04
V+ (V)
+ (mA)
VCON = VCOMP = VFB
SWITCHING0
V+ INPUT CURRENT vs. TEMPERATURE
MAX5003-05
TEMPERATURE (°C)
+ (mA)
VCON = VCOMP = VFB
SWITCHING
V+ = 110V
MAX5003-06
MAXIMUM DUTY CYCLE vs. VINDIV
VINDIV (V)
DUTY CYCLE (%)
400kΩ
PARAMETER IS
RMAXTON
100kΩ
VCON CLAMPED HIGH
300kΩ
200kΩ
0.1k1k10k100k1M10M
ERROR AMP FREQUENCY RESPONSEMAX5003-07
FREQUENCY (Hz)
GAIN (dB)20
PHASE (degrees)
PHASE
GAIN
MAX5003-08
SWITCHING FREQUENCY AND PERIOD
vs. RFREQ
RFREQ (kΩ)
FREQUENCY (kHz)
PERIOD (
FREQUENCY
PERIOD
V+ SHUTDOWN CURRENT
vs. TEMPERATURE
MAX5003-09
TEMPERATURE (°C)
+ (
V+ = 110V
VINDIV = 0
VDD = UNCONNECTED
V+ CURRENT IN BOOTSTRAPPED
OPERATION vs. TEMPERATURE
MAX5003-10
TEMPERATURE (°C)
+ (
V+ = 110V
VINDIV = 1.5V5101520
VCC LOAD REGULATION MAX5003-11
ICC (mA)
(V)
V+ = 50V TO 110V
ES = UNCONNECTED
VDD = UNCONNECTED
V+ = 12V
V+ = 13V
V+ = 15V
V+ = 14V
ypical Operating Characteristics (continued)(VDD= +12V, RFREQ= 200kΩ, RMAXTON= 200kΩ, TA= +25°C, unless otherwise noted.)
MAX5003
High-Voltage PWM
Power-Supply Controller5101520
VCC LOAD REGULATION MAX5003-12
ICC (mA)
(V)
V+ = VES = 12V TO 36V
VDD = UNCONNECTED
MAX5003-13
MAXIMUM FREQUENCY vs. INPUT VOLTAGE
AND FET TOTAL GATE-SWITCHING CHARGE
V+ (V)
MAX SWITCHING FREQUENCY (kHz)
25nC
30nC
10nC
15nC
20nC
Pin Description
Typical Operating Characteristics (continued)(VDD= +12V, RFREQ= 200kΩ, RMAXTON= 200kΩ, TA= +25°C, unless otherwise noted.)
NAMEFUNCTIONV+Preregulator Input. Connect to the power line for use with 25V to 110V line voltages. Bypass V+ to ground
with a 0.1µF capacitor, close to the IC. Connects internally to the drain of a depletion FET preregulator. INDIV
Undervoltage Sensing and Feed-Forward Input. Connect to the center point of an external resistive divider
connected between the main power line and AGND. Undervoltage lockout takes over and shuts down
the controller when VINDIV< 1.2V. INDIV bias is typically 0.01µA.
PINESPreregulator Output. When V+ ranges above 36V, bypass ES to AGND with a 0.1µF capacitor close to
the IC. When V+ is always below 36V, connect ES to V+.FREQ
Oscillator Frequency Adjust and Synchronization Input. In internal free-running mode, the voltage on this
pin is internally regulated to 1.25V. Connect a resistor between this pin and AGND to set the PWM fre-
quency. Drive between VILand VIHat four times the desired frequency for external synchronization.COMPCompensation Connection. Output of the error amplifier, available for compensation.CONControl Input of the PWM ComparatorREFReference Voltage Output (3.0V). Bypass to AGND with a 0.1µF capacitor.SSSoft-Start Capacitor Connection. Ramp time to full current limit is approximately 0.5ms/nF. Limits duty
cycle when VSS< VCON.MAXTON
Maximum On-Time Programming. A resistor from MAXTON to AGND sets the PWM gain and limits the
maximum duty cycle. The voltage on MAXTON tracks the voltage on the INDIV pin. Maximum on-time is
proportional to the value of the programming resistor. The maximum duty cycle is limited to 75%, regard-
less of the programming resistor. FBFeedback Input. Regulates to VFB= VREF/ 2 = 1.5V.
MAX5003
High-Voltage PWM
Power-Supply Controller
Pin Description (continued)
NAMEFUNCTIONPINPGNDPower Ground. Connect to AGND.CS
Current Sense with Blanking. Turns power switch off if VCSrises above 100mV (referenced to PGND).
Connect a 100Ωresistor between CSand the current-sense resistor (Figure 2). Connect CS to PGND if
not used.AGNDAnalog Ground. Connect to PGND close to the IC.NDRVGate Drive for External N-Channel Power FETVCC
Output Driver Power-Rail Decoupling Point. Connect a capacitor to PGND with half the value used for
VDDbypass very close to the pin. If synchronizing several controllers, power the fan-out buffer driving the
FREQ pins from this pin.VDD9.75V Internal Linear-Regulator Output. Drive VDDto a voltage higher than 10.75V to bootstrap the chip
supply. VDDis also the supply voltage rail for the chip. Bypass to AGND with a 5µF to 10µF capacitor.
Detailed DescriptionThe MAX5003 is a PWM controller designed for use as
the control and regulation core of voltage-mode control
flyback converters or forward-voltage power convert-
ers. It provides the power-supply designer with maxi-
mum flexibility and ease of use. The device is specified
up to 110V and will operate from as low as 11V. Its
maximum operating frequency of 300kHz permits the
use of miniature magnetic components to minimize
board space. The range, polarity, and range of output
voltages and power are limited only by design and by
the external components used.
This device works in isolated and nonisolated configu-
rations, and in applications with single or multiple out-
put voltages. All the building blocks of a PWM
voltage-mode controller are present in the MAX5003
and its settings are adjustable. The functional diagram
is shown on Figure 1.
Modern Voltage-Mode ControllersThe MAX5003 offers a voltage-mode control topology
and adds features such as fast input voltage feed for-
ward, programmable maximum duty cycle, and high
operating frequencies. It has all the advantages of cur-
rent-mode control—good control loop bandwidth,
same-cycle response to input voltage changes, and
pulse-by-pulse current limiting. It eliminates disadvan-
tages such as the need for ramp compensation, noise
sensitivity, and the analytical and design difficulties of
dealing with two nested feedback loops. In summary,
voltage-mode control has inherent superior noise
immunity and uses simpler compensation schemes.
Internal Power RegulatorsThe MAX5003’s power stages operate over a wide
range of supply voltages while maintaining low power
consumption. For the high end of the range (+36V to
+110V), power is fed to the V+ pin into a depletion
junction FET preregulator. This input must be decou-
pled with a 0.1µF capacitor to the power ground pin
(PGND). To decouple the power line, other large-value
capacitors must be placed next to the power trans-
former connection.
The preregulator drops the input voltage to a level low
enough to feed a first low-dropout regulator (LDO)
(Figure 1). The input to the LDO is brought out at the ES
pin. ES must also be decoupled with a 0.1µF capacitor.
In applications where the maximum input voltage is
below 36V, connect ES and V+ together and decouple
with a 0.1µF capacitor.
The first LDO generates the power for the VDDline. The
VDDline is available at the VDDpin for decoupling. The
bypass to AGND must be a 5µF to 10µF capacitor.
When the maximum input voltage is always below
18.75V, power may also be supplied at VDD; in this
case, connect V+, ES, and VDDtogether.
Forcing voltages at VDDabove 10.75V (see Electrical
Characteristics) disables the first LDO, typically reduc-
ing current consumption below 50µA (see Typical
Operating Characteristics).
Following the VDDLDO is another regulator that drives
VCC: the power bus for the internal logic, analog cir-
cuitry, and external power MOSFET driver. This regula-
tor is needed because the VDDvoltage level would be
too high for the external N-channel MOSFET gate. The
MAX5003
High-Voltage PWM
Power-Supply ControllerFREQ
REFOK
SDN
INDIV
MAXTON
RAMP
AGND
VCC
VCC
CLK
RAMP
VCC
VREF
CS BLANK
DRIVER
NDRV
CURRENT
SENSE
LIMIT
REF
REFOK
VINOKVINOK
BANDGAP
REFERENCE
LINEAR
REGULATOR
VCCOK
VDDVDD
VCC
VCC
SDNAGND
AGND
LINEAR
REGULATORVDDVES
AGND
100ns
STRETCHING
VCC
VCC
PGND
VDD1
1.2V
UV LOCKOUT
INDIV
FREQ
REF
CON
COMP8
VCC
NDRV
PGND
AGND
MAXTON
VCC
PGND
AGND
HIGH-VOLTAGE EPIFET
VFETBIAS
VCC
PGND
0.1V
PWM COMP
SDN
ERROR AMP
VCON
AGND
AGND
CLKQ“D”FF
MAX5003
“1”
Figure 1. Functional Diagram
