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LM25145RGYR 데이터시트(PDF) 1 Page - Texas Instruments

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부품명 LM25145RGYR
상세설명  6-V to 42-V Synchronous Buck DC-DC Controller With Wide Duty Cycle Range
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제조업체  TI1 [Texas Instruments]
홈페이지  http://www.ti.com
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LM25145RGYR 데이터시트(HTML) 1 Page - Texas Instruments

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BST
HO
SW
VCC
PGND
RT
SS/TRK
COMP
FB
AGND
VIN
VOUT
LM25145
VOUT
SYNC In
GND
PG
SYNCOUT
SYNCIN
EN/UVLO
VIN
ILIM
PGOOD
SYNC Out
LO
LF
COUT
Q1
Q2
CIN
RILIM
CVCC
CBST
CSS
RFB2
RFB1
RC2
CC2
CC1
RC1
CC3
RRT
EN
VIN
Product
Folder
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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.
LM25145
SNVSAT9 – JUNE 2017
LM25145 6-V to 42-V Synchronous Buck DC-DC Controller With Wide Duty Cycle Range
1
1 Features
1
Versatile Synchronous Buck DC-DC Controller
Wide Input Voltage Range of 6 V to 42 V
Adjustable Output Voltage From 0.8 V to 40 V
Meets EN55022 / CISPR 22 EMI Standards
Lossless RDS(on) or Shunt Current Sensing
Switching Frequency From 100 kHz to 1 MHz
SYNC In and SYNC Out Capability
40-ns Minimum On-Time for High VIN / VOUT Ratio
140-ns Minimum Off-Time for Low Dropout
0.8-V Reference With ±1% Feedback Accuracy
7.5-V Gate Drivers for Standard VTH MOSFETs
14-ns Adaptive Dead-Time Control
2.3-A Source and 3.5-A Sink Capability
Low-Side Soft-Start for Prebiased Start-Up
Adjustable Soft-Start or Optional Voltage Tracking
Fast Line and Load Transient Response
Voltage-Mode Control With Line Feedforward
High Gain-Bandwidth Error Amplifier
Precision Enable Input and Open-Drain Power
Good Indicator for Sequencing and Control
Inherent Protection Features for Robust Design
Hiccup Mode Overcurrent Protection
Input UVLO With Hysteresis
VCC and Gate Drive UVLO Protection
Thermal Shutdown Protection With Hysteresis
VQFN-20 Package With Wettable Flanks
Create a Custom Design Using the LM25145 With
WEBENCH® Power Designer
2 Applications
Telecom Infrastructure
Factory Automation
Test and Measurement
Industrial Motor Drives
3 Description
The LM25145 42-V synchronous buck controller is
designed to regulate from a high input voltage source
or from an input rail subject to high voltage transients,
minimizing the need for external surge suppression
components. A high-side switch minimum on-time of
40 ns facilitates large step-down ratios, enabling the
direct step-down conversion from a 24 V nominal
input
to
low-voltage
rails
for
reduced
system
complexity and solution cost. The LM25145 continues
to operate during input voltage dips as low as 6 V, at
nearly 100% duty cycle if needed, making it well
suited for high-performance industrial control, robotic,
datacom, and RF power amplifier applications.
Forced-PWM (FPWM) operation eliminates frequency
variation to minimize EMI, while a user-selectable
diode emulation feature lowers current consumption
at light-load conditions. Cycle-by-cycle overcurrent
protection is accomplished by measuring the voltage
drop across the low-side MOSFET or by using an
optional
current
sense
resistor.
The
adjustable
switching frequency as high as 1 MHz can be
synchronized to an external clock source to eliminate
beat frequencies in noise-sensitive applications.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM25145
VQFN (20)
3.50 mm × 4.50 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Circuit and Efficiency Performance, VOUT = 5 V, FSW = 225 kHz


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