Converter. LM5160 Datasheet

LM5160 Datasheet PDF


Part

LM5160

Description

2-A Synchronous Buck / Fly-Buck DC/DC Converter

Manufacture

etcTI

Page 30 Pages
Datasheet
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LM5160 Datasheet
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LM5160, LM5160A
SNVSA03E – OCTOBER 2014 – REVISED OCTOBER 2018
LM5160, LM5160A Wide Input 65-V, 2-A Synchronous Buck / Fly-Buck™ DC/DC Converter
1 Features
1 Wide 4.5-V to 65-V Input Voltage Range
• Integrated High-Side and Low-Side Switches
– No External Schottky Diode Required
• 2-A Maximum Load Current
• Adaptive Constant On-Time Control
– No External Loop Compensation
– Fast Transient Response
• Selectable Forced PWM or DCM Operation
– FPWM Supports Multi-Output Fly-Buck™
• Nearly Constant Switching Frequency
– Resistor Adjustable up to 1 MHz
• Programmable Soft-Start Time
• Prebiased Start-Up
• ±1% Feedback Voltage Reference
• LM5160A Allows External VCC Bias
• Inherent Protection Features for Robust Design
– Peak Current Limiting Protection
– Adjustable Input UVLO and Hysteresis
– VCC and Gate Drive UVLO Protection
– Thermal Shutdown Protection With Hysteresis
• Create a Custom Design Using the LM5160A With
the WEBENCH® Power Designer
2 Applications
• Industrial Programmable Logic Controller
• IGBT Gate Drive Bias Supply
• Telecom Primary and Secondary Side Bias
• E-Meter Power Line Communication
• Low-Power Isolated DC/DC (Fly-Buck)
Typical Synchronous Buck Application Circuit
VIN
VIN BST
LM5160A
LM5160
SW
VOUT
RON
EN/UVLO
FB
VCC
SS FPWM
AGND PGND
3 Description
The LM5160/A is a 65-V, 2-A synchronous step-down
converter with integrated high-side and low-side
MOSFETs. The adaptive constant on-time control
scheme requires no loop compensation and supports
high step-down ratios with fast transient response. An
internal feedback amplifier maintains ±1% output
voltage regulation over the entire operating
temperature range. The on-time varies inversely with
input voltage resulting in nearly constant switching
frequency.
Peak and valley current limit circuits protect against
overload conditions. The undervoltage lockout
(EN/UVLO) circuit provides independently adjustable
input undervoltage threshold and hysteresis. The
LM5160/A is programmed through the FPWM pin to
operate in continuous conduction mode (CCM) from
no load to full load or to automatically switch to
discontinuous conduction mode (DCM) at light load
for higher efficiency. Forced CCM operation supports
multiple-output and isolated Fly-Buck applications
using a coupled inductor.
The LM5160A shares the same features and pin
configuration as the LM5160. An external bias supply
can be connected to the VCC pin of the LM5160A in
Buck and Fly-Buck applications. This additional
capability lowers IC power dissipation and improves
efficiency at high input voltages.
Device Information(1)
PART NUMBER PACKAGE
BODY SIZE (NOM)
LM5160A
LM5160
WSON (12)
4.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Fly-Buck Application Circuit
VIN
VIN
BST
VOUT(SEC)
LM5160A
LM5160
SW
RON
VOUT(PRI)
EN/UVLO
FB
VCC
SS FPWM
AGND PGND
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.

LM5160 Datasheet
LM5160, LM5160A
SNVSA03E – OCTOBER 2014 – REVISED OCTOBER 2018
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......................................................... 5
6.1 Absolute Maximum Ratings ..................................... 5
6.2 ESD Ratings.............................................................. 5
6.3 Recommended Operating Conditions....................... 5
6.4 Thermal Information .................................................. 6
6.5 Electrical Characteristics........................................... 6
6.6 Switching Characteristics .......................................... 7
6.7 Typical Characteristics ............................................. 8
7 Detailed Description ............................................ 11
7.1 Overview ................................................................ 11
7.2 Functional Block Diagram ....................................... 11
7.3 Feature Description ................................................ 12
7.4 Device Functional Modes ....................................... 15
8 Application and Implementation ........................ 16
8.1 Application Information............................................ 16
8.2 Typical Applications ................................................ 17
8.3 Do's and Don'ts ...................................................... 26
9 Power Supply Recommendations...................... 27
10 Layout................................................................... 28
10.1 Layout Guidelines ................................................ 28
10.2 Layout Example ................................................... 28
11 Device and Documentation Support ................. 29
11.1 Device Support...................................................... 29
11.2 Documentation Support ........................................ 29
11.3 Related Links ........................................................ 30
11.4 Receiving Notification of Documentation Updates 30
11.5 Community Resources.......................................... 30
11.6 Trademarks ........................................................... 30
11.7 Electrostatic Discharge Caution ............................ 31
11.8 Glossary ................................................................ 31
12 Mechanical, Packaging, and Orderable
Information ........................................................... 31
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision D (November 2017) to Revision E
Page
• Changed Features ................................................................................................................................................................. 1
• Changed Description .............................................................................................................................................................. 1
• Changed front page schematics............................................................................................................................................. 1
• Changed Pinout Drawing........................................................................................................................................................ 4
• Changed Function Block Diagram........................................................................................................................................ 11
• Changed Power Supply Recommendations......................................................................................................................... 27
• Changed Related Documentation ....................................................................................................................................... 29
Changes from Revision C (August 2016) to Revision D
Page
• Added WEBENCH links to the data sheet.............................................................................................................................. 1
• Deleted the lead temperature from the Absolute Maximum Ratings table ............................................................................ 5
• Changed the Ripple Configuration section to the Application Information section............................................................... 16
• Changed the Application Performance Plots title to Application Curves in both typical application sections ...................... 21
• Changed the Electrostatic Discharge Caution statement..................................................................................................... 30
Changes from Revision B (July 2015) to Revision C
Page
• Changed full load rating in title from 1.5-A to 2-A .................................................................................................................. 1
• Changed full load rating from 1.5-A to 2-A ............................................................................................................................ 1
• Changed full load rating from 1.5-A to 2-A ............................................................................................................................ 1
• Updated data sheet text to the latest documentation and translations standards ................................................................. 1
• Changed recommended output current rating from 1.5-A to 2-A ........................................................................................... 5
• Changed full load rating from 1.5 A to 2 A ........................................................................................................................... 11
• Changed minimum ripple injection equation......................................................................................................................... 16
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Product Folder Links: LM5160 LM5160A


Features Datasheet pdf Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity Reference Design LM5160, LM516 0A SNVSA03E – OCTOBER 2014 – REVISE D OCTOBER 2018 LM5160, LM5160A Wide Inp ut 65-V, 2-A Synchronous Buck / Fly-Buc k™ DC/DC Converter 1 Features •1 W ide 4.5-V to 65-V Input Voltage Range Integrated High-Side and Low-Side Sw itches – No External Schottky Diode R equired • 2-A Maximum Load Current Adaptive Constant On-Time Control – No External Loop Compensation – Fast Transient Response • Selectable Forc ed PWM or DCM Operation – FPWM Suppor ts Multi-Output Fly-Buck™ • Nearly Constant Switching Frequency – Resist or Adjustable up to 1 MHz • Programma ble Soft-Start Time • Prebiased Start -Up • ±1% Feedback Voltage Reference • LM5160A Allows External VCC Bias Inherent Protection Features for Rob ust Design – Peak Current Limiting Pr otection – Adjustable Input UVLO and Hysteresis – VCC and Gate Drive UVLO Protection – Thermal Shutdown Protection With Hysteresis • Create a Cus.
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