LMR514X0中文資料德州儀器數(shù)據(jù)手冊PDF規(guī)格書
LMR514X0規(guī)格書詳情
1 Features
? Functional Safety-Capable
– Documentation available to aid functional safety
system design
? Configured for rugged industrial applications
– Wide Input voltage range: 4 V to 36 V
– 4-A or 5-A continuous output current
– ±1.0 tolerance voltage reference at room
temperature
– Minimum switching-on time: 75 ns (typical)
– Low Quiescent current: 25 μA
– Adjustable Frequency: 200 kHz to 1.1 MHz
– Frequency spread spectrum (PFM variant)
– Protection features
? Precision enable input
? Open-drain PGOOD
? VIN undervoltage lockout (UVLO)
? Cycle-by-cycle current limiting
? Short-circuit protection with hiccup mode
? Thermal shutdown
– Low dropout mode operation
– Junction temperature range: –40°C to 150°C
? Small solution size and ease of use
– Integrated synchronous rectification
– Internal compensation for ease of use
– WSON-12 package
? Various options in pin-to-pin compatible package
– PFM and forced PWM (FPWM) options
? Create a custom design using the LMR5144x0
with the WEBENCH? Power Designer
2 Applications
? Major appliances
? PLC, DCS, and PAC
? Test and measurement instrumentation
? Power delivery
3 Description
The LMR514x0 is a wide-VIN, easy-to-use
synchronous buck converter capable of driving up to
4-A or 5-A load current. With a wide input range of 4
V to 36 V, the device is suitable for a wide range of
industrial applications for power conditioning from an
unregulated source.
The LMR514x0 features adjustable switching
frequency from 200 kHz to 1.1 MHz with an external
resistor, which provides the flexibility to optimize either
efficiency or external component size. The device has
PFM version to realize high efficiency at light load and
FPWM version to achieve constant frequency, and
small output voltage ripple over the full load range.
Soft-start and compensation circuits are implemented
internally which allows the device to be used with
minimum external components.
The device has built-in protection features, such as
cycle-by-cycle current limit, hiccup mode short-circuit
protection, and thermal shutdown in case of excessive
power dissipation. The LMR514x0 is available in
WSON-12 package.
