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MAX1744, MAX1745
High-Voltage, Step-Down DC-DC Controller in µMAX
High-Voltage (36V) Step-Down DC-DC Controller in µMAX
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Status
Active: In Production.
Description
The MAX1744/MAX1745 are step-down DC-DC controllers 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 external components for space-critical applications. Operation to 100% duty cycle permits the lowest possible 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-saving 10-pin µMAX® package.
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Data Sheet
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An evaluation kit is available: MAX1744EVKIT, MAX1745EVKIT
Key Features
- High-Voltage Operation (up to 36VIN)
- Efficiency > 90%
- Output Power Capability Exceeds 50W
- 10-Pin µMax Package
- Low-Dropout Voltage
- 100% (max) Duty Cycle
- 90µA Quiescent Current
- 4µA Shutdown Current
- Up to 330kHz Switching Frequency
- Output Voltage
- 5V or 3.3V (MAX1744)
- Adjustable 1.25V to 18V (MAX1745)
- Current-Limited Control Scheme
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Applications/Uses
- Automotive Electronics
- FireWire®/IEEE® 1394
- Industrial Control Systems
- Telecom Systems
- Wall-Cube-Powered Devices
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Key Specifications:
| Step-Down Switching Regulators |
| Part Number |
VIN
(V) |
VIN
(V) |
VOUT
(V) |
VOUT
(V) |
Preset VOUT
(V) |
Max. IOUT
(A) |
Output Adjust. Method |
DC-DC Outputs |
Oper. Freq.
(kHz) |
Package/Pins |
Smallest Available Pckg.
(mm2) |
Budgetary Price |
| min |
max |
min |
max |
≤ |
max w/pins |
See Notes |
| MAX1744 |
4.5 |
36 |
3.3 |
5 |
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10 |
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1 |
330 |
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15.4 |
$2.75 @1k |
| MAX1745 |
1.25 |
18 |
- |
Resistor |
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$3.16 @1k |
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See All Step-Down Switching Regulators (288)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
 Typical Operating Circuit
More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-1776
Rev 4;
2010-02-10
This page last modified: 2010-02-10
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