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LM25119 データシート(PDF) 1 Page - Texas Instruments

部品番号 LM25119
部品情報  Wide Input Range, Dual Synchronous Buck Controller
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
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LM25119 データシート(HTML) 1 Page - Texas Instruments

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VOUT2
SS2
RES
RT
AGND
SS1
UVLO
COMP2
FB2
VOUT1
VIN
RAMP2
PGND2
CSG2
CS2
LO2
SW2
HO2
HB2
VCC2
VIN
LM25119
VIN
COMP1
FB1
RAMP1
PGND1
CSG1
CS1
LO1
SW1
HO1
HB1
VCC1
Copyright © 2016, Texas Instruments Incorporated
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Design
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
LM25119, LM25119-Q1
SNVS680H – AUGUST 2010 – REVISED MAY 2016
LM25119, LM25119-Q1 Wide Input Range, Dual Synchronous Buck Controller
1
1 Features
1
LM25119-Q1 Qualified for Automotive
Applications
AEC-Q100 Qualified With the Following Results:
Device Temperature Grade 1: –40°C to 125°C
Ambient Operating Temperature Range
Device HBM ESD Classification Level 1C
Device CDM ESD Classification Level C4A
Emulated Peak Current Mode Control
Wide Operating Range (4.5 V to 42 V)
Easily Configurable for Dual Outputs or
Interleaved Single Output
Robust 3.3-A Peak Gate Drive
Switching Frequency Programmable to 750 kHz
Optional Diode Emulation Mode
Programmable Output From 0.8 V
Precision 1.5% Voltage Reference
Programmable Current Limit
Hiccup Mode Overload Protection
Programmable Soft-Start
Programmable Line Undervoltage Lockout
Automatic Switch-Over to External Bias Supply
Channel2 Enable Logic Input
Thermal Shutdown
Leadless 32-Pin WQFN Package
2 Applications
Automotive Infotainment
Industrial DC-DC Motor Drivers
Automotive USB Accessory Adapters
Telecom: Servers and Routers
3 Description
The LM25119 device 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 using an emulated current ramp.
Current
mode
control
provides
inherent
line
feedforward, 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 50 kHz to 750 kHz. 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 undervoltage lockout. The device is
available in a power enhanced leadless 32-pin WQFN
package featuring an exposed die attach pad to aid
thermal dissipation.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM25119,
LM25119-Q1
WQFN (32)
5.00 mm × 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Circuit


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