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LM5175 Datasheet Preview

LM5175 Datasheet

Synchronous 4-Switch Buck-Boost Controller

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LM5175
SNVSA37A – OCTOBER 2015 – REVISED MAY 2016
LM5175 42-V Wide VIN Synchronous 4-Switch Buck-Boost Controller
1 Features
1 Single Inductor Buck-Boost Controller for Step-
Up/Step-Down DC/DC Conversion
• Wide VIN Range: 3.5 V to 42 V, 60 V Maximum
• Flexible VOUT Range: 0.8 V to 55 V
• VOUT Short Protection
• High Efficiency Buck-Boost Transition
• Adjustable Switching Frequency
• Optional Frequency Sync and Dithering
• Integrated 2-A MOSFET Gate Drivers
• Cycle-by-Cycle Current Limit and Optional Hiccup
• Optional Input or Output Average Current Limiting
• Programmable Input UVLO and Soft-Start
• Power Good and Output Overvoltage Protection
• Selectable CCM or DCM with Pulse Skipping
• Available in HTSSOP-28 and QFN-28 Packages
• Create a Custom Design Using the LM5175 with
the WEBENCH Power Designer
2 Applications
3 Description
The LM5175 is a synchronous four-switch buck-boost
DC/DC controller capable of regulating the output
voltage at, above, or below the input voltage. The
LM5175 operates over a wide input voltage range of
3.5 V to 42 V (60 V maximum) to support a variety of
applications.
The LM5175 employs current-mode control both in
buck and boost modes of operation for superior load
and line regulation. The switching frequency is
programmed by an external resistor and can be
synchronized to an external clock signal.
The device also features a programmable soft-start
function and offers protection features including
cycle-by-cycle current limiting, input undervoltage
lockout (UVLO), output overvoltage protection (OVP),
and thermal shutdown. In addition, the LM5175
features selectable Continuous Conduction Mode
(CCM) or Discontinuous Conduction Mode (DCM)
operation, optional average input or output current
limiting, optional spread spectrum to reduce peak
EMI, and optional hiccup mode protection in
sustained overload conditions.
• Automotive Start-Stop Systems
• Backup Battery and Supercapacitor Charging
• Industrial PC Power Supplies
• USB Power Delivery
• LED Lighting
Device Information
ORDER NUMBER
PACKAGE
BODY SIZE
LM5175PWP
HTSSOP-28
9.7 mm x 4.4 mm
LM5175RHF
QFN-28
4.0 mm x 5.0 mm
4 Simplified Schematic
VIN
Enable
Power Good
EN/UVLO
PGOOD
SS
SLOPE
RT/SYNC
COMP
AGND
PGND
VCC
LM5175
BOOT1
HDRV1
SW1
LDRV1
CS
CSG
LDRV2
SW2
BOOT2
HDRV2
VOSNS
VCC
VCC
VOUT
Copyright © 2016, Texas Instruments Incorporated
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

LM5175 Datasheet Preview

LM5175 Datasheet

Synchronous 4-Switch Buck-Boost Controller

No Preview Available !

LM5175
SNVSA37A – OCTOBER 2015 – REVISED MAY 2016
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Simplified Schematic............................................. 1
5 Revision History..................................................... 2
6 Pin Configuration and Functions ......................... 3
7 Specifications......................................................... 5
7.1 Absolute Maximum Ratings ...................................... 5
7.2 ESD Ratings.............................................................. 5
7.3 Recommended Operating Conditions....................... 5
7.4 Thermal Information .................................................. 6
7.5 Electrical Characteristics........................................... 6
7.6 Typical Characteristics .............................................. 9
8 Detailed Description ............................................ 12
8.1 Overview ................................................................. 12
8.2 Functional Block Diagram ....................................... 13
8.3 Feature Description................................................. 13
8.4 Device Functional Modes........................................ 19
9 Application and Implementation ........................ 20
9.1 Application Information............................................ 20
9.2 Typical Application .................................................. 20
10 Power Supply Recommendations ..................... 28
11 Layout................................................................... 28
11.1 Layout Guidelines ................................................. 28
11.2 Layout Example .................................................... 29
12 Device and Documentation Support ................. 30
12.1 Custom Design with WEBENCH Tools................. 30
12.2 Receiving Notification of Documentation Updates 30
12.3 Documentation Support ........................................ 30
12.4 Community Resources.......................................... 30
12.5 Trademarks ........................................................... 30
12.6 Electrostatic Discharge Caution ............................ 30
12.7 Glossary ................................................................ 30
13 Mechanical, Packaging, and Orderable
Information ........................................................... 31
5 Revision History
Changes from Original (October 2015) to Revision A
Page
• Added QFN-28 Packages....................................................................................................................................................... 1
• Added LM5175RHF information ............................................................................................................................................ 1
• Added RHF package .............................................................................................................................................................. 3
• Added QFN pins .................................................................................................................................................................... 4
• Changed first plus to minus ................................................................................................................................................. 18
• Changed all 1.22 V to 1.23 V .............................................................................................................................................. 19
• Changed equation ............................................................................................................................................................... 24
• Changed equation ............................................................................................................................................................... 26
• Changed equation ............................................................................................................................................................... 26
2 Submit Documentation Feedback
Product Folder Links: LM5175
Copyright © 2015–2016, Texas Instruments Incorporated


Part Number LM5175
Description Synchronous 4-Switch Buck-Boost Controller
Maker etcTI
Total Page 30 Pages
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