LM25119/25119Q
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SNVS680E –AUGUST 2010–REVISED FEBRUARY 2013
LM25119/LM25119Q Wide Input Range Dual Synchronous Buck Controller
Check for Samples: LM25119/25119Q
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FEATURES
• Programmable output from 0.8V
• Precision 1.5% voltage reference
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• LM25119Q is an Automotive Grade product
that is AEC-Q100 grade 1 qualified (-40°C to
• Programmable current limit
125°C operating junction temperature).
• Hiccup mode overload protection
• Emulated peak current mode control
• Programmable soft-start
• Wide operating range from 4.5V to 42V
• Programmable line under-voltage lockout
• Easily configurable for dual outputs or
• Automatic switch-over to external bias supply
interleaved single output
• Channel2 enable logic input
• Robust 3.3A peak gate drive
• Thermal Shutdown
• Switching frequency programmable to 750kHz
• Leadless LLP32 (5mm x 5mm) package
• Optional diode emulation mode
DESCRIPTION
The LM25119 is a dual synchronous buck controller intended for step-down regulator applications from a high
voltage or widely varying input supply. The control method is based upon current mode control utilizing an
emulated current ramp. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting
and ease of loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width
modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications.
The switching frequency is programmable from 50kHz to 750kHz. The LM25119 drives external high-side and
low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode
enables discontinuous mode operation for improved efficiency at light load conditions. A high voltage bias
regulator with automatic switch-over to external bias further improves efficiency. Additional features include
thermal shutdown, frequency synchronization, cycle-by-cycle and hiccup mode current limit and adjustable line
under-voltage lockout. The device is available in a power enhanced leadless LLP-32 package featuring an
exposed die attach pad to aid thermal dissipation.
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PRODUCTION DATA information is current as of publication date.
Copyright © 2010–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.