Buck Controller. LM5117-Q1 Datasheet

LM5117-Q1 Controller. Datasheet pdf. Equivalent

Part LM5117-Q1
Description Wide Input Range Synchronous Buck Controller
Feature Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM5117, LM.
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Total Page 30 Pages
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LM5117-Q1
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Sample &
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Technical
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Tools &
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LM5117, LM5117-Q1
SNVS698F – APRIL 2011 – REVISED AUGUST 2015
LM5117/Q1 Wide Input Range Synchronous Buck Controller with Analog Current Monitor
1 Features
1 LM5117-Q1 is Qualified for Automotive
Applications
• AEC-Q100 Qualified With the Following Results:
– Device Temperature Grade 1: -40°C to 125°C
Ambient Operating Temperature Range
• Emulated Peak Current Mode Control
• Wide Operating Range from 5.5 V to 65 V
• Robust 3.3-A Peak Gate Drives
• Adaptive Dead-Time Output Driver Control
• Free-Run or Synchronizable Clock up to 750 kHz
• Optional Diode Emulation Mode
• Programmable Output from 0.8 V
• Precision 1.5% Voltage Reference
• Analog Current Monitor
• Programmable Current Limit
• Hiccup Mode Overcurrent Protection
• Programmable Soft-Start and Tracking
• Programmable Line Undervoltage Lockout
• Programmable Switchover to External Bias Supply
• Thermal Shutdown
2 Applications
• Automotive Infotainment
• Industrial DC-DC Motor Drivers
• Automotive USB Power
• Telecom Server
3 Description
The LM5117 is a 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
utilizing an emulated current ramp. Current mode
control provides inherent line feed-forward, 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 operating frequency is programmable from 50
kHz to 750 kHz. The LM5117 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 that allows
external bias supply further improves efficiency. The
LM5117’s unique analog telemetry feature provides
average output current information. Additional
features include thermal shutdown, frequency
synchronization, hiccup mode current limit, and
adjustable line undervoltage lockout.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM5117
HTSSOP (20) PWP 6.50 mm × 4.40 mm
LM5117-Q1
WQFN (24) RTW 4.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Typical Application
VIN
SW
VOUT
UVLO VIN DEMB VCC
RAMP
LM5117
VCCDIS
HB
HO
SW
COMP
FB
CM
LO
CS
CSG
RT RES SS AGND PGND
VOUT
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.



LM5117-Q1
LM5117, LM5117-Q1
SNVS698F – APRIL 2011 – REVISED AUGUST 2015
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 5
6.1 Absolute Maximum Ratings ..................................... 5
6.2 ESD Ratings (LM5117) ............................................. 5
6.3 ESD Ratings (LM5117-Q1) ....................................... 5
6.4 Recommended Operating Conditions....................... 6
6.5 Thermal Information .................................................. 6
6.6 Electrical Characteristics........................................... 7
6.7 Switching Characteristics .......................................... 8
6.8 Typical Characteristics .............................................. 9
7 Detailed Description ............................................ 11
7.1 Overview ................................................................. 11
7.2 Functional Block Diagram ....................................... 12
7.3 Feature Description................................................. 13
7.4 Device Functional Modes........................................ 21
8 Application and Implementation ........................ 22
8.1 Application Information............................................ 22
8.2 Typical Applications ............................................... 22
8.3 Detailed Design Procedure ..................................... 22
8.4 Application Curves .................................................. 32
9 Power Supply Recommendations...................... 35
10 Layout................................................................... 35
10.1 Layout Guideline ................................................... 35
11 Device and Documentation Support ................. 36
11.1 Related Links ........................................................ 36
11.2 Community Resources.......................................... 36
11.3 Trademarks ........................................................... 36
11.4 Electrostatic Discharge Caution ............................ 36
11.5 Glossary ................................................................ 36
12 Mechanical, Packaging, and Orderable
Information ........................................................... 36
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision E (March 2013) to Revision F
Page
• Added Device Information and Pin Configuration and Functions sections, ESD Rating table, Feature Description,
Device Functional Modes, Application and Implementation, Power Supply Recommendations, Layout, Device and
Documentation Support , and Mechanical, Packaging, and Orderable Information sections ................................................ 1
• Changed µH into µF ............................................................................................................................................................ 29
Changes from Revision D (March 2013) to Revision E
Page
• Changed layout of National Data Sheet to TI format ........................................................................................................... 34
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