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LM5118 Datasheet Preview

LM5118 Datasheet

Wide Voltage Range Buck-Boost Controller

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LM5118
SNVS566J – APRIL 2008 – REVISED JUNE 2017
LM5118 Wide Voltage Range Buck-Boost Controller
1 Features
1 Ultra-Wide Input Voltage Range From 3 V to 75 V
• Emulated Peak Current Mode Control
• Smooth Transition Between Step-Down and Step-
Up Modes
• Switching Frequency Programmable to 500 KHz
• Oscillator Synchronization Capability
• Internal High Voltage Bias Regulator
• Integrated High and Low-Side Gate Drivers
• Programmable Soft-Start Time
• Ultra-Low Shutdown Current
• Enable Input Wide Bandwidth Error Amplifier
• 1.5% Feedback Reference Accuracy
• Thermal Shutdown
• Package: 20-Pin HTSSOP (Exposed Pad)
• Create a Custom Design Using the LM5118 With
the WEBENCH® Power Designer
2 Applications
Industrial Buck-Boost Supplies
3 Description
The LM5118 wide voltage range Buck-Boost
switching regulator controller features all of the
functions necessary to implement a high-
performance, cost-efficient Buck-Boost regulator
using a minimum of external components. The Buck-
Boost topology maintains output voltage regulation
when the input voltage is either less than or greater
than the output voltage, making it especially suitable
for automotive applications. The LM5118 operates as
a buck regulator while the input voltage is sufficiently
greater than the regulated output voltage and
gradually transitions to the buck-boost mode as the
input voltage approaches the output. This dual-mode
approach maintains regulation over a wide range of
input voltages with optimal conversion efficiency in
the buck mode and a glitch-free output during mode
transitions. This easy-to-use controller includes
drivers for the high-side buck MOSFET and the low-
side boost MOSFET. The regulators control method
is based upon current mode control using an
emulated current ramp. Emulated current mode
control reduces noise sensitivity of the pulse-width
modulation circuit, allowing reliable control of the very
small duty cycles necessary in high input voltage
applications. Additional protection features include
current limit, thermal shutdown and an enable input.
The device is available in a power-enhanced, 20-pin
HTSSOP package featuring an exposed die attach
pad to aid thermal dissipation.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM5118
HTSSOP (20)
6.50 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
VIN VCC
LM5118
HB
HO
HS
SS
CS
RAMP
RT
GND
CSG
LO
VOUT
FB
COMP
VOUT
Efficiency vs VIN and IOUT, VOUT = 12 V
100
95
3 AMP
xxx90
xxx
xxxxxx1AMP
xx
xxx
85
x
2 AMP
80
75
0 10 20 30 40 50 60 70
VIN (V)
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

LM5118 Datasheet Preview

LM5118 Datasheet

Wide Voltage Range Buck-Boost Controller

No Preview Available !

LM5118
SNVS566J – APRIL 2008 – REVISED JUNE 2017
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 4
6 Specifications......................................................... 6
6.1 Absolute Maximum Ratings ...................................... 6
6.2 ESD Ratings.............................................................. 6
6.3 Recommended Operating Conditions....................... 6
6.4 Thermal Information .................................................. 6
6.5 Electrical Characteristics........................................... 7
6.6 Typical Characteristics ............................................ 10
7 Detailed Description ............................................ 12
7.1 Overview ................................................................. 12
7.2 Functional Block Diagram ....................................... 12
7.3 Feature Description................................................. 13
7.4 Device Functional Modes........................................ 20
8 Application and Implementation ........................ 23
8.1 Application Information............................................ 23
8.2 Typical Application ................................................. 23
9 Power Supply Recommendations...................... 35
9.1 Thermal Considerations .......................................... 35
9.2 Bias Power Dissipation Reduction .......................... 36
10 Layout................................................................... 38
10.1 Layout Guidelines ................................................. 38
10.2 Layout Example .................................................... 38
11 Device and Documentation Support ................. 39
11.1 Device Support...................................................... 39
11.2 Trademarks ........................................................... 39
11.3 Electrostatic Discharge Caution ............................ 39
11.4 Glossary ................................................................ 39
12 Mechanical, Packaging, and Orderable
Information ........................................................... 39
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision I (August 2014) to Revision J
Page
• Moved the automotive device to a standalone data sheet (SNVSAX9) ................................................................................ 1
• Moved the storage temp parameters to the Absolute Maximum Ratings .............................................................................. 6
• Changed junction temperature range from: ±150°C max to: –40°C to 150°C ....................................................................... 6
• Changed Handling Ratings table to ESD Ratings .................................................................................................................. 6
• Moved the junction temperature ranges to the condition statement ...................................................................................... 7
• Removed the VOLL minimum value ......................................................................................................................................... 8
• Removed the VOLH minimum value......................................................................................................................................... 8
Changes from Revision H (October 2013) to Revision I
Page
• Changed data sheet flow and layout to conform with new TI standards. Added the following sections: Application
and Implementation; Power Supply Recommendations; Layout; Device and Documentation Support; Mechanical,
Packaging, and Ordering Information .................................................................................................................................... 1
• Deleted footnote "These pins must not be raised above VIN." .............................................................................................. 6
Changes from Revision G (February, 2013) to Revision H
Page
• Deleted VIN Range on Functional Block Diagram................................................................................................................. 12
• Changed Figure 19............................................................................................................................................................... 24
• Changed Inductor Selection, L1 Text ................................................................................................................................... 27
• Changed Equation 15........................................................................................................................................................... 27
• Changed Equation 16 .......................................................................................................................................................... 27
• Added Efficiency Parameter ................................................................................................................................................. 27
• Changed II(PEAK) Value .......................................................................................................................................................... 28
• Changed I2(PEAK) Value.......................................................................................................................................................... 28
• Changed R13 = RSENSEText ................................................................................................................................................ 28
• Added Equation 19 .............................................................................................................................................................. 28
2 Submit Documentation Feedback
Product Folder Links: LM5118
Copyright © 2008–2017, Texas Instruments Incorporated


Part Number LM5118
Description Wide Voltage Range Buck-Boost Controller
Maker etcTI
Total Page 30 Pages
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