900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf






etcTI

LM25145 Datasheet Preview

LM25145 Datasheet

6-V to 42-V Synchronous Buck DC-DC Controller

No Preview Available !

Product
Folder
Order
Now
Technical
Documents
Tools &
Software
Support &
Community
LM25145
SNVSAT9 – JUNE 2017
LM25145 6-V to 42-V Synchronous Buck DC-DC Controller With Wide Duty Cycle Range
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.
VOUT
RC2
CC3
RFB2
Typical Application Circuit and Efficiency Performance, VOUT = 5 V, FSW = 225 kHz
VIN
EN
VIN
VIN EN/UVLO
Q1
SYNC In
SYNCIN
HO
SYNC Out
RFB1 CC1
RC1
CC2
RRT
CSS
SYNCOUT
COMP
FB LM25145
RT
SS/TRK
BST
SW
LO
VCC
AGND
PGND
PGOOD ILIM
CBST
Q2
CVCC
LF
VOUT
CIN
COUT
GND
PG
RILIM
1
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.




etcTI

LM25145 Datasheet Preview

LM25145 Datasheet

6-V to 42-V Synchronous Buck DC-DC Controller

No Preview Available !

LM25145
SNVSAT9 – JUNE 2017
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Description (continued)......................................... 3
6 Pin Configuration and Functions ......................... 4
6.1 Wettable Flanks ........................................................ 5
7 Specifications......................................................... 6
7.1 Absolute Maximum Ratings ...................................... 6
7.2 ESD Ratings.............................................................. 6
7.3 Recommended Operating Conditions....................... 7
7.4 Thermal Information .................................................. 7
7.5 Electrical Characteristics........................................... 7
7.6 Switching Characteristics ........................................ 10
7.7 Typical Characteristics ............................................ 11
8 Detailed Description ............................................ 16
8.1 Overview ................................................................. 16
8.2 Functional Block Diagram ....................................... 16
8.3 Feature Description................................................. 17
8.4 Device Functional Modes........................................ 25
9 Application and Implementation ........................ 27
9.1 Application Information............................................ 27
9.2 Typical Applications ................................................ 36
10 Power Supply Recommendations ..................... 47
11 Layout................................................................... 48
11.1 Layout Guidelines ................................................. 48
11.2 Layout Example .................................................... 51
12 Device and Documentation Support ................. 53
12.1 Device Support .................................................... 53
12.2 Documentation Support ........................................ 53
12.3 Related Links ........................................................ 54
12.4 Receiving Notification of Documentation Updates 54
12.5 Community Resources.......................................... 54
12.6 Trademarks ........................................................... 54
12.7 Electrostatic Discharge Caution ............................ 54
12.8 Glossary ................................................................ 54
13 Mechanical, Packaging, and Orderable
Information ........................................................... 54
4 Revision History
SPACER
DATE
June 2017
REVISION
*
NOTES
Initial release
2
Submit Documentation Feedback
Product Folder Links: LM25145
Copyright © 2017, Texas Instruments Incorporated


Part Number LM25145
Description 6-V to 42-V Synchronous Buck DC-DC Controller
Maker etcTI
PDF Download

LM25145 Datasheet PDF






Similar Datasheet

1 LM25141 Wide Input Range Synchronous Buck Controller
etcTI
2 LM25141-Q1 Wide Input Range Synchronous Buck Controller
etcTI
3 LM25145 6-V to 42-V Synchronous Buck DC-DC Controller
etcTI





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z



Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy