Buck Controller. LM5140-Q1 Datasheet

LM5140-Q1 Controller. Datasheet pdf. Equivalent

Part LM5140-Q1
Description Wide Input Range Dual Synchronous Buck Controller
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Total Page 30 Pages
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LM5140-Q1
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Sample &
Buy
Technical
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LM5140-Q1
SNVSA02A – JANUARY 2016 – REVISED DECEMBER 2016
LM5140-Q1 Wide Input Range Dual Synchronous Buck Controller
1 Features
1 Qualified for Automotive Applications
• AEC-Q100 Test Guidance With the Following
– Device Temperature Grade 1: –40ºC to
+125ºC Ambient Operating Temperature
– Device HBM ESD Classification Level 2
– Device CDM ESD Classification Level C4B
• Input Operating Range from 3.8 V to 65 V (70 V
Absolute Maximum)
• Two Interleaved Buck Controllers With:
– VOUT1 Fixed 3.3 V, 5 V, or Adjustable
from 1.5 V – 15 V, Accuracy ±1%
– VOUT2 Fixed 5 V, 8 V, or Adjustable
from 1.5 V – 15 V, Accuracy ±1%
• Fixed 2.2-MHz or 440-kHz Switching Frequency,
Accuracy ±7%
• Optional Synchronization to an External Clock
• SYNC Output Clock for Additional Converters
• Shutdown Mode Current: 9 µA Typical
• No Load Standby Current: 35 µA Typical (One
Channel Operating)
• Current Limit Threshold Programmable to 50 mV
or 75 mV, Accuracy ±10%
• Independent Enable Inputs for VOUT1 and
VOUT2
• Hiccup Mode Protection for Sustained Overload
• Independent Power Good Outputs
• High-Side and Low-Side Gate Drivers With
Adjustable Slew Rate Control
• Selectable Diode Emulation or Continuous
Conduction at Light Load
• 40-Pin VQFN Package With Wettable Flanks
2 Applications
• Automotive Electronics
• Infotainment Systems
• Instrument Clusters
• Advanced Driver Assistance (ADAS)
3 Description
The LM5140-Q1 is a dual synchronous buck
controller intended for high voltage wide VIN step-
down converter applications. The control method is
based on current mode control. Current mode control
provides inherent line feedforward, cycle-by-cycle
current limiting, and easier loop compensation.
The LM5140-Q1 features adjustable slew rate control
to simplify compliance with the CISPR and
automotive EMI requirements. The LM5140-Q1
operates at selectable switching frequencies of 2.2
MHz or 440 kHz with the two controller channels
switching 180º out of phase. In light or no-load
conditions, the LM5140-Q1 operates in skip cycle
mode for improved low power efficiency. The
LM5140-Q1 includes a high voltage bias regulator
with automatic switchover to an external bias supply
to improve efficiency and reduce input current.
Additional features include frequency synchronization,
cycle-by-cycle current limit, hiccup mode fault
protection for sustained overloads, independent
power good outputs, and independent enable inputs.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM5140-Q1
VQFN (40)
6.00 mm × 6.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
VIN
VOUT1
VIN
VCC
VCC
VCC
VIN
HB1
HO1
HOL1
SW1
LO1
LOL1
PGND1
PG1
EN1
ILSET
CS1
VOUT1
SYNIN
COMP1
HB2
LM5140-Q1
HO2
HOL2
SW2
LO2
LOL2
PGND2
EN2
PG2
SYNOUT
CS2
VOUT2
VCCX
COMP2
FB1 FB2
OSC AGND SS1 RES SS2 DEMB VDDA
VCC
VIN
VCC
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.



LM5140-Q1
LM5140-Q1
SNVSA02A – JANUARY 2016 – REVISED DECEMBER 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......................................................... 5
6.1 Absolute Maximum Ratings ...................................... 5
6.2 ESD Ratings.............................................................. 5
6.3 Recommended Operating Conditions....................... 6
6.4 Thermal Information .................................................. 6
6.5 Electrical Characteristics........................................... 7
6.6 Switching Characteristics .......................................... 9
6.7 Typical Characteristics ............................................ 11
7 Detailed Description ............................................ 14
7.1 Overview ................................................................. 14
7.2 Functional Block Diagram ....................................... 15
7.3 Feature Description................................................. 16
7.4 Device Functional Modes........................................ 23
8 Application and Implementation ........................ 26
8.1 Application Information............................................ 26
8.2 Typical Application ................................................. 26
9 Power Supply Recommendations...................... 38
10 Layout................................................................... 38
10.1 Layout Guidelines ................................................. 38
10.2 Layout Example .................................................... 39
11 Device and Documentation Support ................. 41
11.1 Receiving Notification of Documentation Updates 41
11.2 Community Resources.......................................... 41
11.3 Trademarks ........................................................... 41
11.4 Electrostatic Discharge Caution ............................ 41
11.5 Glossary ................................................................ 41
12 Mechanical, Packaging, and Orderable
Information ........................................................... 41
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (January 2016) to Revision A
Page
• Updated data sheet text to the latest TI documentation and translations standards ............................................................. 1
• Added AEC-Q100 Test Guidance bullets to Features............................................................................................................ 1
• Added content to the Minimum Output Voltage Adjustment section .................................................................................... 21
• Changed Equation 11........................................................................................................................................................... 22
• Changed content and Equation 12 in Slope Compensation section .................................................................................... 23
• Changed content and Equation 14 and Equation 15 in Inductor Calculation section .......................................................... 27
• Changed Equation 39........................................................................................................................................................... 30
• Changed Equation 41........................................................................................................................................................... 31
• Changed content and Equation 52 through Equation 55 in Control Loop section ............................................................... 34
• Changed content, Equation 57, and Equation 60 through Equation 63 in Error Amplifier section ..................................... 35
• Added equations Equation 56, Equation 58 and Equation 61 in Error Amplifier section .................................................... 35
• Changed Figure 38............................................................................................................................................................... 36
• Changed Equation 64........................................................................................................................................................... 36
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