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MAX1745EUBMAXIMN/a202avaiHigh-Voltage, Step-Down DC-DC Controller in レMAX
MAX1745EUBMAXN/a18avaiHigh-Voltage, Step-Down DC-DC Controller in レMAX
MAX1745AUBMAXIMN/a638avaiHigh-Voltage, Step-Down DC-DC Controller in レMAX
MAX1744AUBMAXN/a5avaiHigh-Voltage, Step-Down DC-DC Controller in レMAX
MAX1744EUBMAXIMN/a9avaiHigh-Voltage, Step-Down DC-DC Controller in レMAX


MAX1745AUB ,High-Voltage, Step-Down DC-DC Controller in レMAXELECTRICAL CHARACTERISTICS(V = SHDN = 5.5V to 36V, 3/5 = GND, I = 0, T = 0°C to +85°C, unless other ..
MAX1745AUB+ ,High-Voltage, Step-Down DC-DC Controller in µMAXELECTRICAL CHARACTERISTICS(V = V = 5.5V to 36V, 3/5 = GND, I = 0, T = 0°C to +85°C, unless otherwis ..
MAX1745EUB ,High-Voltage, Step-Down DC-DC Controller in レMAXapplications.Operation to 100% duty cycle permits the lowest possi- Low-Dropout Voltageble dropout ..
MAX1745EUB ,High-Voltage, Step-Down DC-DC Controller in レMAXGeneral Description ________
MAX1745EUB+ ,High-Voltage, Step-Down DC-DC Controller in µMAXFeaturesThe MAX1744/MAX1745 are step-down DC-DC con-♦ High-Voltage Operation (Up to 36V IN)trollers ..
MAX1745EUB+T ,High-Voltage, Step-Down DC-DC Controller in µMAXMAX1744/MAX174519-1776; Rev 4; 8/09High-Voltage, Step-Down DC-DC Controllers in µMAX
MAX4580CWE ,1.25з, Dual SPST, CMOS Analog SwitchesELECTRICAL CHARACTERISTICS–Dual Supplies(V+ = +15V, V- = -15V, V = +5V, V = +2.4V, V = +0.8V, T = T ..
MAX4580CWE+ ,1.25Ω, Dual SPST, CMOS Analog SwitchesApplicationsMAX4580EAE -40°C to +85°C 16 SSOPReed Relay ReplacementMAX4580EWE -40°C to +85°C 16 Wid ..
MAX4580EAE ,1.25з, Dual SPST, CMOS Analog Switchesapplications where current switching' Guaranteed ESD Protection >2kV per is required. They have low ..
MAX4580EAE+ ,1.25Ω, Dual SPST, CMOS Analog Switchesapplications and are♦ Rail-to-Rail Signal Handlingthe preferred solution over mechanical relays in ..
MAX4581ASE ,Low-Voltage, CMOS Analog Multiplexers/SwitchesFeaturesThe MAX4581/MAX4582/MAX4583 are low-voltage, ♦ Pin Compatible with Industry-Standard CMOS a ..
MAX4581CEE ,Low-Voltage, CMOS Analog Multiplexers/SwitchesMAX4581/MAX4582/MAX458319-1328; Rev 1; 10/99Low-Voltage, CMOS AnalogMultiplexers/Switches__________ ..


MAX1744AUB-MAX1744EUB-MAX1745AUB-MAX1745EUB
High-Voltage, Step-Down DC-DC Controller in レMAX
General Description
The MAX1744/MAX1745 are step-down DC-DC con-
trollers capable of handling up to 36V inputs. These
parts use a proprietary current-limited control scheme
for excellent light- and full-load efficiency, while their
330kHz (max) switching frequency permits small exter-
nal components for space-critical applications.
Operation to 100% duty cycle permits the lowest possi-
ble dropout voltage.
The MAX1744 contains an internal feedback network
that provides a pin-selectable output voltage of either
3.3V or 5V. The MAX1745 uses an external feedback
network to generate an adjustable output voltage
between 1.25V and 18V.
The MAX1744/MAX1745 are available in a space-sav-
ing 10-pin µMAX package.
________________________Applications

Automotive Electronics
Telecom Systems
Wall-Cube-Powered Devices
Industrial Control Systems
Firewire/IEEE1394
____________________________Features
High-Voltage Operation (up to 36V IN)Efficiency >90%Output Power Capability Exceeds 50W10-Pin µMax PackageLow-Dropout Voltage100% (max) Duty Cycle90µA Quiescent Current4µA Shutdown CurrentUp to 330kHz Switching FrequencyOutput Voltage
5V or 3.3V (MAX1744)
Adjustable 1.25V to 18V (MAX1745)
Current-Limited Control Scheme
MAX1744/MAX1745
High-Voltage, Step-Down DC-DC
Controller in µMAX

19-1776; Rev 1; 10/01
Ordering Information
Typical Operating Circuit
Pin Configuration
MAX1744/MAX1745
High-Voltage, Step-Down DC-DC
Controller in µMAX
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(VIN= SHDN= 5.5V to 36V, 3/5 = GND, ILOAD = 0, TA= 0°C to +85°C, unless otherwise noted. Typical values at VIN= SHDN=
36V, 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.
IN, EXT, SHDNto GND...........................................-0.3V to +38V
VH to GND..............................................................-0.3V to +34V
VH, EXT to IN............................................................-7V to +0.3V
CS, OUT to GND....................................................-0.3V to +20V
FB, 3/5, REF to GND.....................................-0.3V to (VL + 0.3V)
VL to GND...................................................................-0.3V to 6V
Continuous Power Dissipation (TA= +70°C)
10-Pin µMAX (derate 5.6mW/°C above 70°C).............444mW
Operating Temperature Range
MAX174_EUB..................................................-40°C to +85°C
MAX174_AUB................................................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................+300°C
MAX1744/MAX1745
High-Voltage, Step-Down DC-DC
Controller in µMAX
ELECTRICAL CHARACTERISTICS

(VIN= SHDN= 5.5V to 36V, 3/5 = GND, ILOAD = 0, TA= -40°C to +85°C, unless otherwise noted.) (Note 1)
MAX1744/MAX1745
High-Voltage, Step-Down DC-DC
Controller in µMAX
ELECTRICAL CHARACTERISTICS
Note 1:
Specifications to -40°C are guaranteed by design, not production tested.
MAX1744/MAX1745
High-Voltage, Step-Down DC-DC
Controller in µMAX

EFFICIENCY vs. LOAD CURRENT
(VOUT = +3.3V)

MAX1744/5toc01
LOAD CURRENT (A)
EFFICIENCY (%)40
IN PIN QUIESCENT CURRENT
vs. INPUT VOLTAGE (5.5V TO 36V)
MAX1744/5toc03
INPUT VOLTAGE (V)
QUIESCENT CURRENT (
IN PIN QUIESCENT CURRENT
vs. INPUT VOLTAGE (3.5V TO 5.5V)
MAX1744/5toc04
INPUT VOLTAGE (V)
QUIESCENT CURRENT (mA)
SWITCHING FREQUENCY
vs. INPUT VOLTAGE
MAX1744/5toc05
INPUT VOLTAGE (V)
SWITCHING FREQUENCY (kHz)
IN PIN QUIESCENT CURRENT
vs. TEMPERATURE

MAX1744/5toc06
TEMPERATURE (°C)
QUIESCENT CURRENT (
EXT RISE AND FALL TIMES
vs. CAPACITANCE
MAX1744/5toc07
CAPACITANCE (pF)
tRISE
AND t
FALL
(ns)
EXT RISE AND FALL TIMES
vs. TEMPERATURE

MAX1744/5toc08
TEMPERATURE (°C)
tRISE
AND t
FALL
(ns)
CURRENT-SENSE TRIP LEVEL
vs. TEMPERATURE
MAX1744/5toc09
TEMPERATURE (°C)
CURRENT-SENSE TRIP LEVEL (mV)
-50125ypical Operating Characteristics
(Circuit of Figure 1, TA = +25°C, unless otherwise specified.)
MAX1744/MAX1745
High-Voltage, Step-Down DC-DC
Controller in µMAX
Typical Operating Characteristics (continued)

(Circuit of Figure 1, TA = +25°C, unless otherwise specified.)
MAX1744/MAX1745
High-Voltage, Step-Down DC-DC
Controller in µMAX
Detailed Description

The MAX1744/MAX1745 are high-voltage step-down
DC-DC converter controllers. These devices offer high
efficiency over a wide range of input/output voltages
and currents, making them optimal for use in applica-
tions such as telecom, automotive, and industrial con-
trol. Using an external P-channel MOSFET and
current-sense resistor allows design flexibility and
improved efficiency. The MAX1744/MAX1745 automati-
cally switch from PWM operation at medium and heavy
loads to pulse-skipping operation at light loads to
improve light-load efficiency. The low 90µA quiescent
current further optimizes these parts for applications
where low input current is critical. Operation to 100%
duty cycle allows the lowest possible dropout voltage,
which allows a wider input voltage variation. The small
size, high switching frequency, and low parts count
minimize the required circuit board area and compo-
nent cost. Figure 1 shows the MAX1744 typical applica-
tion circuit.
Operating Modes

When delivering low output currents, the MAX1744/
MAX1745 operate in discontinuous-conduction mode.
Current through the inductor starts at zero, rises as
high as the current limit, then ramps down to zero dur-
ing each cycle (Figure 3). The switch waveform exhibits
ringing, which occurs at the resonant frequency of the
inductor and stray capacitance, due to residual energy
trapped in the core when the commutation diode (D1 in
Figure 1) turns off.
When delivering medium-to-high output currents, the
MAX1744/MAX1745 operate in PWM continuous-con-
duction mode (Figure 4). In this mode, current always
flows through the inductor and never ramps to zero.
The control circuit adjusts the switch duty cycle to
maintain regulation without exceeding the peak switch-
ing current set by the current-sense resistor.
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