Boost Controller. LM5122-Q1 Datasheet

LM5122-Q1 Controller. Datasheet pdf. Equivalent

Part LM5122-Q1
Description Wide-Input Synchronous Boost Controller
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LM5122-Q1
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LM5122-Q1
SNVSAW9 – JUNE 2017
LM5122-Q1 Wide-Input Synchronous Boost Controller With Multiple Phase Capability
1 Features
1 AEC-Q100 Qualified with the following results:
– Device Temperature Grade 1: –40°C to
+125°C Ambient Operating Temperature
– Device HBM ESD Classification Level 2
– Device CDM ESD Classification Level C6
• Maximum Input Voltage: 65 V
• Minimum Input Voltage: 3 V (4.5 V for Start-Up)
• Output Voltage up to 100 V
• Bypass (VOUT = VIN) Operation
• 1.2-V Reference with ±1% Accuracy
• Free-Run and Synchronizable Switching to 1 MHz
• Peak-Current-Mode Control
• Robust 3-A Integrated Gate Drivers
• Adaptive Dead-Time Control
• Optional Diode-Emulation Mode
• Programmable Cycle-by-Cycle Current Limit
• Hiccup-Mode Overload Protection
• Programmable Line UVLO
• Programmable Soft Start
• Thermal Shutdown Protection
• Low Shutdown Quiescent Current: 9 μA
• Programmable Slope Compensation
• Programmable Skip-Cycle Mode Reduces
Standby Power
• Allows External VCC Supply
• Inductor DCR Current Sensing Capability
• Multi-phase Capability
• Thermally Enhanced 20-Pin HTSSOP
• Create a Custom Design Using the LM5122 With
the WEBENCH® Power Designer
2 Applications
• 12-V, 24-V, and 48-V Power Systems
• Automotive Start-Stop
• Audio Power Supply
• High-Current Boost Power Supply
3 Description
The LM5122 is a multi-phase capable synchronous
boost controller intended for high-efficiency
synchronous boost regulator applications. The control
method is based upon peak-current-mode control.
Current-mode control provides inherent line feed
forward, cycle-by-cycle current limiting, and ease of
loop compensation.
The switching frequency is programmable up to
1 MHz. Higher efficiency is achieved by two robust N-
channel MOSFET gate drivers with adaptive dead-
time control. A user-selectable diode-emulation mode
also enables discontinuous-mode operation for
improved efficiency at light load conditions.
An internal charge pump allows 100% duty cycle for
high-side synchronous switch (bypass operation). A
180° phase shifted clock output enables easy multi-
phase interleaved configuration. 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)
LM5122-Q1
HTSSOP (20)
6.50 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
space
space
Simplified Application Diagram
VIN VOUT
VCC BST
CSN
CSP
VIN
UVLO
SLOPE
SYNCIN/RT
SYNCOUT
LM5122
SW
LO
HO
COMP
FB
RES
SS
MODE
PGND
AGND
OPT
+
Copyright © 2017, 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.



LM5122-Q1
LM5122-Q1
SNVSAW9 – 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 ......................... 3
6 Specifications......................................................... 5
6.1 Absolute Maximum Ratings ...................................... 5
6.2 ESD Ratings: LM5122-Q1 ........................................ 5
6.3 Recommended Operating Conditions....................... 6
6.4 Thermal Information ................................................. 6
6.5 Electrical Characteristics........................................... 6
6.6 Typical Characteristics ............................................ 10
7 Detailed Description ............................................ 13
7.1 Overview ................................................................. 13
7.2 Functional Block Diagram ....................................... 13
7.3 Feature Description................................................. 14
7.4 Device Functional Modes........................................ 21
8 Application and Implementation ........................ 24
8.1 Application Information............................................ 24
8.2 Typical Application .................................................. 34
9 Power Supply Recommendations...................... 43
10 Layout................................................................... 43
10.1 Layout Guidelines ................................................. 43
10.2 Layout Example .................................................... 43
11 Device and Documentation Support ................. 44
11.1 Device Support...................................................... 44
11.2 Receiving Notification of Documentation Updates 44
11.3 Community Resources.......................................... 44
11.4 Trademarks ........................................................... 44
11.5 Electrostatic Discharge Caution ............................ 44
11.6 Glossary ................................................................ 44
12 Mechanical, Packaging, and Orderable
Information ........................................................... 45
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from May 1, 2017 to June 9, 2017
Page
• Split out LM5122-Q1 from the combined datasheet SNVS954 commercial and automotive document started
February 2013. This document SNVSAW9 details the Automotive LM5122-Q1 portion. ...................................................... 1
• Added links for WEBENCH ................................................................................................................................................... 1
• Changed 20-HTSSOP Thermal Information........................................................................................................................... 6
• Added Negative to Positive conversion example ................................................................................................................. 33
2 Submit Documentation Feedback
Product Folder Links: LM5122-Q1
Copyright © 2017, Texas Instruments Incorporated





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