MAX5003EEE ,High-Voltage PWM Power-Supply ControllerELECTRICAL CHARACTERISTICS(V+ = V = V = +12V, V = 2V, V = 0, R = R = 200kΩ , T = T to T , unless ot ..
MAX5003EEE ,High-Voltage PWM Power-Supply ControllerFeaturesThe MAX5003 high-voltage switching power-supply Wide Input Range: 11V to 110Vcontroller ha ..
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 ..
MAX9140EXK+T ,40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply ComparatorsApplicationsMAX9144EUD 14 TSSOP —● Line ReceiversMAX9144ESD 14 SO —● Battery-Powered Systems● Thres ..
MAX9140EXK+T ,40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply ComparatorsFeatures● Fast, 40ns Propagation Delay (10mV Overdrive)The MAX9140/MAX9141 are single and the MAX91 ..
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 ..
MAX5003CEE-MAX5003EEE-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 Range
MAX5003
High-Voltage PWM
Power-Supply Controller
Pin Configuration
Ordering Information
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
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.)
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.
MAX5003
High-Voltage PWM
Power-Supply ControllerV+ INPUT CURRENT vs. VOLTAGE
MAX5003-04
V+ (V)
+ (mA)0
V+ INPUT CURRENT vs. TEMPERATURE
MAX5003-05
TEMPERATURE (°C)
+ (mA)
MAX5003-06345
MAXIMUM DUTY CYCLE vs. VINDIVVINDIV (V)
DUTY CYCLE (%)
0.1k1k10k100k1M10M
ERROR AMP FREQUENCY RESPONSEMAX5003-07
FREQUENCY (Hz)
GAIN (dB)20
PHASE (degrees)
MAX5003-08
SWITCHING FREQUENCY AND PERIOD
vs. RFREQ
RFREQ (kΩ)
FREQUENCY (kHz)
PERIOD (
V+ SHUTDOWN CURRENT
vs. TEMPERATURE
MAX5003-09
TEMPERATURE (°C)
+ (5101520
VCC LOAD REGULATION MAX5003-11
ICC (mA)
(V)
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)
MAX5003-13
MAXIMUM FREQUENCY vs. INPUT VOLTAGE
AND FET TOTAL GATE-SWITCHING CHARGE
V+ (V)
MAX SWITCHING FREQUENCY (kHz)
Pin Description
Typical Operating Characteristics (continued)(VDD= +12V, RFREQ= 200kΩ, RMAXTON= 200kΩ, TA= +25°C, unless otherwise noted.)
MAX5003
High-Voltage PWM
Power-Supply Controller
Pin Description (continued)
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 Controller
