LM25116MH National Semiconductor, LM25116MH Datasheet
LM25116MH
Manufacturer Part Number
LM25116MH
Description
IC,SMPS CONTROLLER,CURRENT-MODE,TSSOP,20PIN,PLASTIC
Manufacturer
National Semiconductor
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© 2007 National Semiconductor Corporation
LM25116
Wide Range Synchronous Buck Controller
General Description
The LM25116 is a synchronous buck controller intended for
step-down regulator applications from a high voltage or widely
varying input supply. The control method is based upon cur-
rent 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 appli-
cations. The operating frequency is programmable from
50kHz to 1MHz. The LM25116 drives external high-side and
low-side NMOS power switches with adaptive dead-time con-
trol. A user-selectable diode emulation mode enables discon-
tinuous mode operation for improved efficiency at light load
conditions. A low quiescent current shutdown disables the
controller and consumes less than 10µA of total input current.
Additional features include a high voltage bias regulator, au-
tomatic switch-over to external bias for improved efficiency,
thermal shutdown, frequency synchronization, cycle by cycle
current limit and adjustable line under-voltage lockout. The
device is available in a power enhanced TSSOP-20 package
featuring an exposed die attach pad to aid thermal dissipation.
Typical Application
300156
Features
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Emulated peak current mode
Wide operating range up to 42V
Low I
Drives standard or logic level MOSFETs
Robust 3.5A peak gate drive
Free-run or synchronous operation to 1MHz
Optional diode emulation mode
Programmable output from 1.215V to 36V
Precision 1.5% voltage reference
Programmable current limit
Programmable soft-start
Programmable line under-voltage lockout
Automatic switch to external bias supply
TSSOP-20EP exposed pad
Thermal shutdown
Q
shutdown (<10µA)
30015601
www.national.com
April 2007
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