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LM5574MT Image
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LM5574MT

In Stock: 7,931

75V, 0.5A Step-Down Switching Regulator

LM5574MT Information

Description

The LM5574MT is a switching voltage regulator from Texas Instruments that provides high-efficiency power conversion with synchronous rectification. It features soft-start for smooth startup, flexible frequency control, and various protection mechanisms such as overvoltage, undervoltage lockout, short-circuit, and overtemperature protection. This device is suitable for applications requiring step-down voltage regulation, including industrial control systems, automotive electronics, portable devices, LED lighting, point-of-load converters, telecom infrastructure, and battery-powered equipment. It offers a wide operating voltage range and can be used in fault-tolerant operation. The LM5574MT has a high level of integration, making it suitable for compact designs. Its features include digital-pulse width modulation, safe startup and shutdown, low-voltage ride-thru capability, and robust overcurrent protection.

Features

According to the product information, the LM5574MT features include:

  • High Efficiency Power Conversion
  • Synchronous Rectification
  • Soft-Start for Smooth Startup
  • Flexible Frequency Control
  • Overvoltage Protection
  • Undervoltage Lockout
  • Short-Circuit Protection
  • Current Limiting for Safety
  • Overtemperature Protection
  • Synchronous Switching
  • Efficiency-Enhancing Architecture
  • Fault-Tolerant Operation
  • Error Amplifier Feedback Control
  • Resistor-Adjustable Frequency
  • Wide Operating Voltage Range
  • Digital-Pulse Width Modulation
  • Safe Startup and Shutdown
  • Low-Voltage Ride-Thru Capability
  • Robust Overcurrent Protection
  • Pulse-Width Modulation
  • Digital Voltage Regulation
  • Programmable Output Current
  • Thermal Shutdown Protection

Package

The package type of LM5574MT is TSSOP-16.

Manufacturer

The manufacturer of the LM5574MT is Texas Instruments (TI).

Applications

The LM5574MT is commonly used in industrial control systems, automotive electronics, power management for portable devices, LED lighting, point-of-load converters, telecom infrastructure, and battery-powered equipment. It provides high efficiency power conversion with features like synchronous rectification, soft-start, and overcurrent protection.

Specifications

Vin (min) (V) 6 Vin (max) (V) 75
Vout (min) (V) 1.23 Vout (max) (V) 70
Iout (max) (A) 0.5 Iq (typ) (mA) 1
Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 500
Features Enable, Frequency synchronization, Over Current Protection, Tracking Operating temperature range (°C) -40 to 125
Rating Catalog Regulated outputs (#) 1
Control mode current mode Duty cycle (max) (%) 95
Type Converter feature-type Synchronous Step Down
feature-isolation feature-process-technology
feature-output-type Adjustable feature-switching-frequency-khz 50 to 500
feature-number-of-outputs 1 feature-output-voltage-v 1.23 to 70
feature-maximum-output-current-a 0.5 feature-maximum-output-power-w
feature-minimum-input-voltage-v 6 feature-maximum-input-voltage-v 75
feature-typical-switch-current-a 0.7 feature-efficiency-
feature-packaging Tube feature-rad-hard
feature-pin-count 16 feature-cecc-qualified No
feature-esd-protection feature-escc-qualified
feature-military No feature-aec-qualified No
feature-aec-qualified-number feature-auto-motive No
feature-p-pap No feature-eccn-code EAR99
feature-svhc Yes feature-svhc-exceeds-threshold Yes
Package/Case TSSOP16

LM5574MT FAQs

1.Q: Does the TPS55740 require external compensation?

A: Yes, the COMP pin connects to an external RC network for loop stability. Follow the datasheet’s guidelines for component selection and layout.

2.Q: What is the typical efficiency of the TPS55740 at full load?

A: Typical efficiency exceeds 90% under optimal conditions (e.g., 12V input to 5V output at 500mA), depending on external components and switching frequency.

3.Q: What thermal considerations apply to the TPS55740 in high-temperature environments?

A: Ensure proper PCB layout for heat dissipation, as the junction-to-ambient thermal resistance (θJA) impacts performance. Use thermal vias or heatsinks if operating near maximum temperatures.

4.Q: What related parts are comparable to the TPS55740?

A: Similar devices include the LM5017 (100V input) and TPS54360 (60V input) from Texas Instruments, offering varying voltage/current capabilities.

5.Q: What package does the TPS55740 use?

A: The device is housed in a 16-pin TSSOP package with dimensions 5.1mm x 4.5mm x 1.05mm (max) for compact surface-mount designs.

6.Q: What are the recommended operating conditions for the TPS55740?

A: Operate with 6V to 75V input, 1.225V to 70V output, -40°C to +125°C ambient temperature, and ensure a load current ≤500mA.

7.Q: What are the absolute maximum ratings for the TPS55740?

A: Absolute maximum ratings include 75V input voltage, 500mA switch current, and a junction temperature range of -40°C to +150°C. Exceeding these may damage the device.

8.Q: What applications is the TPS55740 suitable for?

A: It is ideal for industrial power systems, automotive electronics, and battery-powered devices requiring high-efficiency step-down conversion.

9.Q: What are the key features of the Texas Instruments TPS55740 75V Buck Regulator?

A: Key features include a 6V to 75V input range, adjustable output voltage (1.225V to 70V), 500mA output current, 500kHz switching frequency, and operation from -40°C to +125°C.

10.Q: What is the pinout configuration for the Texas Instruments TPS55740 synchronous buck converter?

A: The TPS55740 in a 16-pin TSSOP package includes pins for VIN, GND, SW (switch node), FB (feedback), EN (enable), BOOT, COMP (compensation), and PG (power good). Refer to the datasheet for the complete pinout diagram.

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Ratings and Reviews

  • N
    N**s

    07/04/2025

    6

    All quality, delivery about 1 week! For such trifles very quickly. Threw in the mailbox, the parcel was not tracked! I'm not going to recalculate shit tipo, for this price is very worthy! In the case did not check, but i think everything is fine, even if half will work, i'm enough))) the only thing, i counted on a slightly larger size, well, come on! Thank you seller!!!

  • A
    A**n

    09/17/2020

    2

    All three workers. Came in 25 days. New version. When the power is turned off, the program does not fly off. I recommend the seller.

  • J
    J**n

    07/30/2020

    16

    Shipping 14 days. Shine bright seller thanks.

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