Buck Controller. LM5140-Q1 Datasheet

LM5140-Q1 Controller. Datasheet pdf. Equivalent

LM5140-Q1 Datasheet
Recommendation LM5140-Q1 Datasheet
Part LM5140-Q1
Description Wide Input Range Dual Synchronous Buck Controller
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Texas Instruments LM5140-Q1
Product
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Sample &
Buy
Technical
Documents
Tools &
Software
Support &
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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.



Texas Instruments 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
2 Submit Documentation Feedback
Product Folder Links: LM5140-Q1
Copyright © 2016, Texas Instruments Incorporated



Texas Instruments LM5140-Q1
www.ti.com
5 Pin Configuration and Functions
RWG Package
40-Pin VQFN
Top View
LM5140-Q1
SNVSA02A – JANUARY 2016 – REVISED DECEMBER 2016
40 39
38 37 36 35 34 33 32 31
SS2 1
COMP2 2
FB2 3
CS2 4
VOUT2 5
VCCX 6
PG2 7
HOL2 8
HO2 9
SW2 10
Exposed Pad on Bottom
Connect to Ground
30 SS1
29 COMP1
28 FB1
27 CS1
26 VOUT1
25 VIN
24 PG1
23 HOL1
22 HO1
21 SW1
11 12 13 14 15 16 17 18 19 20
Connect Exposed Pad on bottom to AGND and PGND on the PCB.
PIN
NO. NAME
1 SS2
2 COMP2
3 FB2
4 CS2
5 VOUT2
6 VCCX
7 PG2
8 HOL2
9 HO2
10 SW2
11 HB2
12 LOL2
13 LO2
14 PGND2
Pin Functions
I/O DESCRIPTION
Channel 2 soft-start programming pin. An external capacitor and an internal 20-μA current
I
source set the ramp rate of the internal error amplifier reference during soft-start. Pulling SS
pin below 80 mV turns off the channel 2 gate driver outputs, but all the other functions
remain active.
O Output of the channel 2 transconductance error amplifier.
Feedback input of channel 2. Connect the FB2 pin to VDD for a 5-V output or connect FB2
I
to ground for a fixed 8-V output. A resistive divider from the VOUT2 to the FB2 pin sets the
output voltage level between 1.5 V and 15 V. The regulation threshold at the FB2 pin is 1.2
V.
I
Channel 2 current sense amplifier input. Make a low current Kelvin connection between this
pin and the inductor side of the external current sense resistor.
I
Output and the current sense amplifier input of channel 2 . Connect this pin to the output
side of the channel 2 current sense resistor.
I
Optional input for an external bias supply. If VCCX > 4.5 V, VCCX is internally connected to
VCC and the internal VCC regulator is disabled. If VCCX is unused, it must be grounded.
O An open-collector output which goes low if VOUT2 is outside a specified regulation window.
O Channel 2 high-side gate driver turnoff output.
O Channel 2 high-side gate driver turnon output.
I
Switching node of the channel 2 buck regulator. Connect to the bootstrap capacitor, the
source terminal of the high-side MOSFET and the drain terminal of the low-side MOSFET.
O Channel 2 high-side driver supply for bootstrap gate drive.
O Channel 2 low-side gate driver turnoff output.
O Channel 2 low-side gate driver turnon output.
G Power ground connection pin for low-side NMOS gate driver.
Copyright © 2016, Texas Instruments Incorporated
Product Folder Links: LM5140-Q1
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