LM5576MHX

SIMPLE SWITCHER® 75V, 3A Step-Down Switching Regulator

General Description

The LM5576 is an easy to use SIMPLE SWITCHER® buck regulator which allows design engineers to design and optimize a robust power supply using a minimum set of components. Operating with an input voltage range of 6 - 75V, the LM5576 delivers 3A of continuous output current with an integrated 170mΩ N-Channel MOSFET. The regulator utilizes an Emulated Current Mode architecture which provides inherent line regulation, tight load transient response, and ease of loop compensation without the usual limitation of low-duty cycles associated with current mode regulators. The operating frequency is adjustable from 50kHz to 500kHz to allow optimization of size and efficiency. To reduce EMI, a frequency synchronization pin allows multiple IC’s from the LM(2)557x family to self-synchronize or to synchronize to an external clock. The LM5576 guarantees robustness with cycle-by-cycle current limit, short-circuit protection, thermal shut-down, and remote shut-down. The device is available in a power enhanced TSSOP-20 package featuring an exposed die attach pad for thermal dissipation. The LM5576 is supported by the full suite of WEBENCH® On-Line design tools

Features

■ Integrated 75V, 170mΩ N-channel MOSFET

■ Ultra-wide input voltage range from 6V to 75V

■ Adjustable output voltage as low as 1.225V

■ 1.5% feedback reference accuracy

■ Operating frequency adjustable between 50kHz and 500kHz with single resistor

■ Master or slave frequency synchronization

■ Adjustable soft-start

■ Emulated current mode control architecture

■ Wide bandwidth error amplifier

■ Built-in protection Package

■ TSSOP-20EP (Exposed Pad)

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.

VIN to GND 76V

BST to GND 90V

PRE to GND 76V

SW to GND (Steady State) -1.5V

BST to VCC 76V SD, VCC to GND 14V

BST to SW 14V

OUT to GND Limited to Vin SYNC, SS, FB, RAMP to GND 7V

ESD Rating (Note 2) Human Body Model 2kV

Storage Temperature Range -65°C to +150°C

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