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LM5122MH Datasheet Preview

LM5122MH Datasheet

Wide-Input Synchronous Boost Controller

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LM5122
SNVS954H – FEBRUARY 2013 – REVISED JUNE 2017
LM5122 Wide-Input Synchronous Boost Controller With Multiple Phase Capability
1 Features
1 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 or 24-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
HTSSOP (20)
6.50 mm × 4.40 mm
LM5122Z
HTSSOP (24)
7.80 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.




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LM5122MH Datasheet Preview

LM5122MH Datasheet

Wide-Input Synchronous Boost Controller

No Preview Available !

LM5122
SNVS954H – FEBRUARY 2013 – 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: LM5122, LM5122Z ............................. 6
6.3 Recommended Operating Conditions....................... 7
6.4 Thermal Information ................................................. 7
6.5 Electrical Characteristics........................................... 7
6.6 Typical Characteristics ............................................ 11
7 Detailed Description ............................................ 14
7.1 Overview ................................................................. 14
7.2 Functional Block Diagram ....................................... 14
7.3 Feature Description................................................. 15
7.4 Device Functional Modes........................................ 22
8 Application and Implementation ........................ 25
8.1 Application Information............................................ 25
8.2 Typical Application .................................................. 35
9 Power Supply Recommendations...................... 44
10 Layout................................................................... 44
10.1 Layout Guidelines ................................................. 44
10.2 Layout Example .................................................... 44
11 Device and Documentation Support ................. 45
11.1 Device Support...................................................... 45
11.2 Receiving Notification of Documentation Updates 45
11.3 Community Resources.......................................... 45
11.4 Trademarks ........................................................... 45
11.5 Electrostatic Discharge Caution ............................ 45
11.6 Glossary ................................................................ 45
12 Mechanical, Packaging, and Orderable
Information ........................................................... 46
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
• Changed by splitting out the automotive datasheet from this commercial datasheet ........................................................... 1
• Added 24-pin HTTSOP package option ................................................................................................................................. 1
• Added links for WEBENCH ................................................................................................................................................... 1
• Added 24-HTSSOP pin configuration..................................................................................................................................... 4
• Added 24-HTSSOP Functions ............................................................................................................................................... 5
• Changed UVLO value............................................................................................................................................................. 6
• Changed VCC value .............................................................................................................................................................. 6
• Changed one NC value ......................................................................................................................................................... 6
• Changed from outlet to contact ............................................................................................................................................. 6
• Added LM5122Z part number ................................................................................................................................................ 6
• Changed 20-HTSSOP Thermal Information and added 24-HTSSOP thermal values ........................................................... 7
• Added ICSP –ICSN (LM5122Z only) specs ................................................................................................................................ 9
• Added No load, 50% to 50% (LM5122Z only) specs ........................................................................................................... 10
• Added 24-pin HTSSOP ........................................................................................................................................................ 14
• Added Negative to Positive conversion example ................................................................................................................. 34
Changes from Revision F (May 2015) to Revision G
Page
• Added Automotive ESD feature.............................................................................................................................................. 1
• Added paragraph and second equation .............................................................................................................................. 22
• Changed equation ............................................................................................................................................................... 22
2
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Copyright © 2013–2017, Texas Instruments Incorporated


Part Number LM5122MH
Description Wide-Input Synchronous Boost Controller
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