Buck Controller. LM5119Q Datasheet

LM5119Q Controller. Datasheet pdf. Equivalent

Part LM5119Q
Description Wide Input Range Dual Synchronous Buck Controller
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Total Page 30 Pages
Datasheet
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LM5119Q
Product
Folder
Order
Now
Technical
Documents
Tools &
Software
Support &
Community
Reference
Design
LM5119Q
SLUSD96 – APRIL 2018
LM5119Q Wide Input Range Dual Synchronous Buck Controller
1 Features
1 Qualified for Automotive Applications
• 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 1C
– Device CDM ESD Classification Level C4A
• Emulated Peak Current Mode Control
• Wide Operating Range (5.5 V to 65 V)
• Easily Configurable for Dual Outputs or
Interleaved Single Output
• Robust 3.3-A Peak Gate Drive
• Switching Frequency Programmable to 750 kHz
• Optional Diode Emulation Mode
• Programmable Output from 0.8 V
• Precision 1.5% Voltage Reference
• Programmable Current Limit
• Hiccup Mode Overload Protection
• Programmable Soft-Start
• Programmable Line Undervoltage Lockout
• Automatic Switch-Over to External Bias Supply
• Channel2 Enable Logic Input
• Thermal Shutdown
• Leadless 32-Pin WQFN Package
2 Applications
• Automotive Infotainment
• Automotive USB Accessory Adapters
3 Description
The LM5119Q device is a dual 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 using an emulated current ramp.
Current mode control provides inherent line
feedforward, 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 switching frequency is
programmable from 50 kHz to 750 kHz. The
LM5119Q device 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 with automatic switch-over to external bias
further improves efficiency. Additional features
include thermal shutdown, frequency synchronization,
cycle-by-cycle and hiccup mode current limit and
adjustable line undervoltage lockout. The device is
available in a power enhanced leadless 32-pin WQFN
package featuring an exposed die attach pad to aid
thermal dissipation.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM5119Q
WQFN (32)
5.00 mm × 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Application Circuit
VIN
VCC1 VIN VCC2
VOUT1
VIN
HB1
HO1
HB2
HO2
SW1
SW2
LO1
CS1
CSG1
LM5119Q
LO2
CS2
CSG2
PGND1
PGND2
RAMP1
RAMP2
FB1 FB2
COMP1
COMP2
UVLO AGND SS1 RT SS2 RES
VOUT2
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.



LM5119Q
LM5119Q
SLUSD96 – APRIL 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 ......................... 3
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 .......................................... 8
6.7 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........................................ 18
8 Application and Implementation ........................ 19
8.1 Application Information............................................ 19
8.2 Typical Applications ................................................ 21
9 Power Supply Recommendations...................... 34
10 Layout................................................................... 34
10.1 Layout Guidelines ................................................. 34
10.2 Layout Example .................................................... 35
11 Device and Documentation Support ................. 36
11.1 Receiving Notification of Documentation Updates 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.
DATE
April 2018
REVISION
*
NOTES
Initial release. Previously included with the
LM5119 data sheet. To view previous
revision history, see SNVS680.
2 Submit Documentation Feedback
Product Folder Links: LM5119Q
Copyright © 2018, Texas Instruments Incorporated





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