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LM5574/LM5574Q,pdf datasheet (
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2009-09-29
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The LM5574 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
LM5574 delivers 0.5A of continuous output current with an
integrated 750mΩ 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 lowduty
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 LM5574 guarantees robustness with cycle-
by-cycle current limit, short-circuit protection, thermal
shut-down, and remote shut-down. The device is available in
a TSSOP-16 package. The LM5574 is supported by the full
suite of WEBENCH® On-Line design tools.
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
LM5574 delivers 0.5A of continuous output current with an
integrated 750mΩ 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 lowduty
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 LM5574 guarantees robustness with cycle-
by-cycle current limit, short-circuit protection, thermal
shut-down, and remote shut-down. The device is available in
a TSSOP-16 package. The LM5574 is supported by the full
suite of WEBENCH® On-Line design tools.
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