LM25576MH Integrated Circuits ICs Chip 42V 3A Step Down Switching Regulator

LM25576MH Integrated Circuit Chip 42V 3A Step Down Switching Regulator

General Description

The LM25576 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 - 42V, the LM25576 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 1MHz 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 LM25576 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 LM25576 is supported by the full suite of WEBENCH® On-Line design tools.

Features

■ Integrated 42V, 170mΩ N-channel MOSFET

■ Ultra-wide input voltage range from 6V to 42V

■ Adjustable output voltage as low as 1.225V

■ 1.5% feedback reference accuracy

■ Operating frequency adjustable between 50kHz and 1MHz 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.

V_IN to GND 45V

BST to GND 60V

PRE to GND 45V

SW to GND (Steady State) -1.5V

BST to V_CC 45V

SD, V_CC 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

Operating Ratings (Note 1)

V_IN 6V to 42V

Operation Junction Temperature −40°C to + 125°C

Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics.

Note 2: The human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin.

Simplified Application Schematic

Connection Diagram

Ordering Information

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