›

MAX1745

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

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

Download Data Sheet

Please check latest availability status for a specific part variant.

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

Enlarge+

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 (389)

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 >

Order

Status:

Package:

Temperature:

Related Resources

New Products

MAX20473
Low-Voltage Synchronous Boost Converter

Synchronous Boost Converter
3.0V to 4.0V Operating Supply Voltage
True Output Shutdown

High Precision

±1.5% Output-Voltage Accuracy
93V ±2% Undervoltage Monitoring
107V ±2% Overvoltage Monitoring

Robust for the Automotive Environment

Current-Mode Control, Forced-PWM, and Skip Operation
Overtemperature and Overcurrent Protection
12-Pin (3mm × 3mm) TDFN

MAX17662
3.5V to 36V, 2A, High-Efficiency, Synchronous Step-Down DC-DC Converter

Reduces External Components and Total Cost
Reduces Number of DC-DC Regulators to Stock
Reduces Power Dissipation

MAX77504
14V Input, 3A High-Efficiency Buck Converter in WLP or QFN

3A Single-Channel Buck Regulator
2.6V to 14V Input Voltage
0.6V to 6V Output Voltage Range

MAX20458
36V Boost Controller with 3.5A Synchronous Buck Converter For Automotive Applications

Meets Stringent OEM Module Power Consumption and Performance Specifications
Enables Crank-Ready Designs
EMI Reduction Features Reduce Interference with Sensitive Radio Bands without Sacrificing Wide Input Voltage Range

MAX20057
36V Boost Controller with Dual 3.5A/2A Synchronous Buck Converters for Automotive Applications

Meets Stringent OEM Module Power Consumption and Performance Specifications
Enables Crank-Ready Designs
Integration and Thermally Enhanced Packages Save Board Space and Cost

MAX17631
4.5V to 36V, 1.5A, High-Efficiency, Synchronous Step-Down DC-DC Converter

Reduces External Components and Total Cost
Reduces Number of DC-DC Regulators to Stock
Reduces Power Dissipation

MAX17634A
4.5V to 36V, 4.25A, High-Efficiency, Synchronous Step-Down DC-DC Converter

Reduces External Components and Total Cost
Reduces Number of DC-DC Regulators to Stock
Reduces Power Dissipation

MAX17634B
4.5V to 36V, 4.25A, High-Efficiency, Synchronous Step-Down DC-DC Converter

Reduces External Components and Total Cost
Reduces Number of DC-DC Regulators to Stock
Reduces Power Dissipation

MAX17634C
4.5V to 36V, 4.25A, High-Efficiency, Synchronous Step-Down DC-DC Converter

Reduces External Components and Total Cost
Reduces Number of DC-DC Regulators to Stock
Reduces Power Dissipation

MAX77501
110V_PK-PK High-Efficiency Piezo Haptic Actuator Boost Driver

110V_PK-PK Haptic Waveforms Generation
Optimized for up to 2µF Haptic Piezo Actuator
2.8V to 5.5V Input Supply Range

MAX20457
36V Dual 3.5A/2A Synchronous Buck Converters for Automotive Applications

Meets Stringent OEM Module Power Consumption and Performance Specifications
Enables Crank-Ready Designs
EMI Reduction Features Reduce Interference with Sensitive Radio Bands without Sacrificing Wide Input-Voltage Range

MAXM17536
4.5V to 60V, 4A High-Efficiency, DC-DC Step-Down SiP Power Module with Integrated Inductor