Boost Controller. LM5121 Datasheet

LM5121 Controller. Datasheet pdf. Equivalent

Part LM5121
Description Wide Input Synchronous Boost Controller
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LM5121
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LM5121, LM5121-Q1
SNVS963C – SEPTEMBER 2013 – REVISED JUNE 2016
LM5121/-Q1 Wide Input Synchronous Boost Controller with Disconnection Switch Control
1 Features
1 AEC-Q100 Qualified with the following results:
– Device Temperature Grade 1: -40°C to +125°C
Ambient Operating Temperature Range
– Device HBM ESD Classification Level 2
– Device CDM ESD Classification Level C6
• Maximum Input Voltage: 65 V
• Min Input Voltage: 3.0 V (4.5 V for startup)
• Output Voltage Up to 100 V
• Bypass (VOUT = VIN) Operation
• 1.2-V Reference with ±1.0% Accuracy
• Free-Run/Synchronizable up to 1 MHz
• Peak Current Mode Control
• Robust Integrated 3-A Gate Drivers
• Adaptive Dead-Time Control
• Optional Diode Emulation Mode
• Programmable Cycle-by-Cycle Current Limit
• 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
• Supports External VCC Bias Supply Option
• Load Disconnection in Shutdown Mode (True
Shutdown)
• Inrush Current Limiting
• Hiccup Mode Short Circuit/Overload Protection
• Circuit Breaker Function
• Capable of Input Transient Suppression
• Capable of Reverse Battery Protection
• Thermally Enhanced 20-Pin HTSSOP
2 Applications
• 12-V, 24-V, and 48-V Power Systems
• Automotive Start-Stop
• High Current Boost Power Supply
• Battery Powered System
3 Description
The LM5121 is a synchronous boost controller
intended for high-efficiency, high-power 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 using two robust
N-channel MOSFET gate drivers with adaptive dead-
time control. A user-selectable diode emulation mode
enables discontinuous mode operation for improved
efficiency at light load conditions.
The LM5121 provides disconnection switch control
which completely disconnects the output from the
input during an output short or a shutdown condition.
During start-up sequence, inrush current is limited by
the disconnection switch control.
An internal charge pump allows 100% duty cycle
operation of the high-side synchronous switch
(Bypass operation). 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)
LM5121
LM5121-Q1
HTSSOP (20)
6.50 mm x 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Simplified Application Diagram
VIN VOUT
VCC BST
DS
DG
CSN
CSP
VIN
UVLO
SLOPE
SYNCIN/RT
LM5121
SW
LO
HO
COMP
FB
RES
SS
MODE
PGND
AGND
+
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.



LM5121
LM5121, LM5121-Q1
SNVS963C – SEPTEMBER 2013 – REVISED JUNE 2016
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......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings: LM5121 .............................................. 5
6.3 ESD Ratings: LM5121-Q1 ........................................ 5
6.4 Recommended Operating Conditions....................... 5
6.5 Thermal Information .................................................. 5
6.6 Electrical Characteristics........................................... 6
6.7 Typical Characteristics .............................................. 9
7 Detailed Description ............................................ 12
7.1 Overview ................................................................. 12
7.2 Functional Block Diagram ....................................... 12
7.3 Feature Description................................................. 13
7.4 Device Functional Modes........................................ 21
8 Application and Implementation ........................ 24
8.1 Application Information............................................ 24
8.2 Typical Application .................................................. 32
9 Power Supply Recommendations...................... 40
10 Layout................................................................... 40
10.1 Layout Guidelines ................................................. 40
10.2 Layout Example .................................................... 40
11 Device and Documentation Support ................. 41
11.1 Related Links ........................................................ 41
11.2 Receiving Notification of Documentation Updates 41
11.3 Community Resources.......................................... 41
11.4 Trademarks ........................................................... 41
11.5 Electrostatic Discharge Caution ............................ 41
11.6 Glossary ................................................................ 41
12 Mechanical, Packaging, and Orderable
Information ........................................................... 41
4 Revision History
Changes from Revision B (December 2014) to Revision C
Page
• Added Automotive ESD Features........................................................................................................................................... 1
• Changed equation ............................................................................................................................................................... 20
Changes from Revision A (September 2013) to Revision B
Page
• Added Pin Configuration and Functions section, Handling Rating table, Feature Description section, Device
Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout
section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information
section ................................................................................................................................................................................... 1
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Product Folder Links: LM5121 LM5121-Q1





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