MAX1744 Maxim, MAX1744 Datasheet
MAX1744
Manufacturer Part Number
MAX1744
Description
High-Voltage / Step-Down DC-DC Controller in MAX
Manufacturer
Maxim
Datasheet
1.MAX1744.pdf
(14 pages)
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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.
19-1776; Rev 1; 10/01
________________________Applications
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.
ON
5V
4.5V TO 36V
Automotive Electronics
Telecom Systems
Wall-Cube-Powered Devices
Industrial Control Systems
Firewire/IEEE1394
IN
OFF
3.3V
Typical Operating Circuit
SHDN
3/5
VL
REF
________________________________________________________________ Maxim Integrated Products
MAX1744
IN
GND
VH
General Description
OUT
EXT
CS
P
High-Voltage, Step-Down DC-DC
OUT
3.3V
OR 5V
o High-Voltage Operation (up to 36V IN)
o Efficiency >90%
o Output Power Capability Exceeds 50W
o 10-Pin µMax Package
o Low-Dropout Voltage
o 100% (max) Duty Cycle
o 90µA Quiescent Current
o 4µA Shutdown Current
o Up to 330kHz Switching Frequency
o Output Voltage
o Current-Limited Control Scheme
____________________________Features
MAX1744EUB
MAX1744AUB
MAX1745EUB
MAX1745AUB
( ) ARE FOR MAX1745 ONLY.
TOP VIEW
5V or 3.3V (MAX1744)
Adjustable 1.25V to 18V (MAX1745)
PART
Controller in µMAX
3/5 (FB)
GND
OUT
REF
VL
1
2
3
4
5
-40°C to +85°C
-40°C to +125°C
-40°C to +85°C
-40°C to +125°C
TEMP RANGE
Ordering Information
MAX1744
MAX1745
µMAX
Pin Configuration
10
9
8
7
6
PIN-PACKAGE
10 µMAX
10 µMAX
10 µMAX
10 µMAX
IN
EXT
VH
SHDN
CS
1
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