LM5576Q0 Datasheet, PDF (1/27 Pages) Texas Instruments – LM5576Q0 SIMPLE SWITCHER® 75V, 3A Step-Down Switching Regulator

LM5576Q0
www.ti.com
SNOSB24B – OCTOBER 2008 – REVISED APRIL 2013
LM5576Q0 SIMPLE SWITCHER^® 75V, 3A Step-Down Switching Regulator
Check for Samples: LM5576Q0
FEATURES
1
•2 LM5576Q0 is an Automotive Grade Product
that is AEC-Q100 Grade 0 Qualified
• -40°C to 150°C Operating Junction
Temperature
• Integrated 75V, 170mΩ N-Channel MOSFET
• Ultra-Wide Input Voltage Range from 6V to 75V
• Adjustable Output Voltage as Low as 1.225V
• 1.65% 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
APPLICATIONS
• Automotive
• Industrial
DESCRIPTION
The LM5576Q0 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
LM5576Q0 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 LM5576Q0 ensures 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 LM5576Q0 is supported by the full
suite of WEBENCH^® On-Line design tools.
PACKAGE
• TSSOP-20EP (Exposed Pad)
SIMPLIFIED APPLICATION SCHEMATIC
VIN
VIN
BST
SYNC
SW
LM5576
SD
IS
VOUT
RT
OUT
VCC
FB
SS
RAMP
COMP
GND
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
SIMPLE SWITCHER, WEBENCH are registered trademarks of Texas Instruments Incorporated.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008–2013, Texas Instruments Incorporated