MAX1744, MAX1745 High-Voltage, Step-Down DC-DC Controller in µMAX

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.

Key Features

Applications/Uses

High-Voltage Operation (up to 36V_IN)
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

	Automotive Electronics
	FireWire®/IEEE 1394™
	Industrial Control Systems
	Telecom Systems
	Wall-Cube-Powered Devices

Key Specifications: Switch-Mode DC-DC Power Supplies

Part Number

Topology

V_IN (min) (V)

V_IN (max) (V)

Number of DC-DC Outputs

Preset V_OUT (V)

Digital/VID Programmed Output

Min. Adjustable V_OUT (V)

Max. Adjustable V_OUT (V)

I_OUT (A)

Operating Current, I_CC (max) (mA)

Fixed Freq/PWM Operation

Operating Freq. (kHz)

Internal Power Switch(es)

Synchronous Rectifier

Industry Qualified

Package

Smallest Available Package (max w/pins) (mm²)

Price^**

MAX1744

Step-Down

4.5

3.3

0.14

330

uMAX/10

$2.75 @ 1k

MAX1745

1.25

Automotive - General

$2.75 @ 1k

See All Switch-Mode DC-DC Power Supplies (413)

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.

Ordering Information

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-16 of 16

MAX1744

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX1744AUB+

uMAX;10 pin;15 mm²
Dwg: 21-0061J (PDF)
Use pkgcode/variation: U10C+4*

-40°C to +125°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1744AUB+T

uMAX;10 pin;15 mm²
Dwg: 21-0061J (PDF)
Use pkgcode/variation: U10C+4*

-40°C to +125°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1744AUB

uMAX;10 pin;15 mm²
Dwg: 21-0061J (PDF)
Use pkgcode/variation: U10C-4*

-40°C to +125°C

RoHS/Lead-Free: No
Materials Analysis

MAX1744AUB-T

uMAX;10 pin;15 mm²
Dwg: 21-0061J (PDF)
Use pkgcode/variation: U10C-4*

-40°C to +125°C

RoHS/Lead-Free: No
Materials Analysis

MAX1744EUB

uMAX;10 pin;15 mm²
Dwg: 21-0061J (PDF)
Use pkgcode/variation: U10C-4*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1744EUB+T

uMAX;10 pin;15 mm²
Dwg: 21-0061J (PDF)
Use pkgcode/variation: U10C+4*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1744EUB+

uMAX;10 pin;15 mm²
Dwg: 21-0061J (PDF)
Use pkgcode/variation: U10C+4*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1744EUB-T

uMAX;10 pin;15 mm²
Dwg: 21-0061J (PDF)
Use pkgcode/variation: U10C-4*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1745

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX1745AUB+

uMAX;10 pin;15 mm²
Dwg: 21-0061J (PDF)
Use pkgcode/variation: U10C+4*

-40°C to +125°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1745AUB+T

uMAX;10 pin;15 mm²
Dwg: 21-0061J (PDF)
Use pkgcode/variation: U10C+4*

-40°C to +125°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1745AUB-T

uMAX;10 pin;15 mm²
Dwg: 21-0061J (PDF)
Use pkgcode/variation: U10C-4*

-40°C to +125°C

RoHS/Lead-Free: No
Materials Analysis

MAX1745AUB

uMAX;10 pin;15 mm²
Dwg: 21-0061J (PDF)
Use pkgcode/variation: U10C-4*

-40°C to +125°C

RoHS/Lead-Free: No
Materials Analysis

MAX1745EUB-T

uMAX;10 pin;15 mm²
Dwg: 21-0061J (PDF)
Use pkgcode/variation: U10C-4*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1745EUB+

uMAX;10 pin;15 mm²
Dwg: 21-0061J (PDF)
Use pkgcode/variation: U10C+4*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1745EUB+T

uMAX;10 pin;15 mm²
Dwg: 21-0061J (PDF)
Use pkgcode/variation: U10C+4*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1745EUB

uMAX;10 pin;15 mm²
Dwg: 21-0061J (PDF)
Use pkgcode/variation: U10C-4*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

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