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MAX1745

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

High-Voltage (36V) Step-Down DC-DC Controller in µMAX

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Overview

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.

MAX1744, MAX1745: Typical Operating Circuit

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Key Features

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

Applications/Uses

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

Parametric Specs

Part Number

V_IN
(V)

V_OUT1
(V)

Preset V_OUT
(V)

Output Adjust. Method

I_OUT1
(A)

Switch Type

DC-DC Outputs

Oper. Freq.
(kHz)

Package/Pins

Budgetary
Price

min

max

min

max

See Notes

MAX1744

4.5

3.3

Preset

Resistor

External

330

UMAX/10

$2.97 @1k

MAX1745

1.25

Resistor

UMAX/10

$3.32 @1k

See All Step-Down Switching Regulators (404)

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 and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources

MAX1744EVKIT: Evaluation Kit for the MAX1744, MAX1745
MAX1745EVKIT: Evaluation Kit for the MAX1744, MAX1745

Technical Documents

App Note 1845 Choosing the Right DC-DC Converter for Automotive Applications
App Note 912 Turn-On Switching Loss of An Asynchronous Buck Converter

Quality and Environmental Data

Product Reliability Reports: MAX1745.pdf
Lead-Free Package Tin (Sn) Whisker Reports

Quality And Environmental

Device	Fab Process	Technology	Sample size	Rejects	FIT at 25°C	FIT at 55°C

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >

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