900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf






etcTI

LM51571-Q1 Datasheet Preview

LM51571-Q1 Datasheet

Boost/SEPIC/Flyback Converter

No Preview Available !

www.ti.com
LM5157-Q1, LM51571-Q1
SNVSBK8A – OCTOBERLM20521057R-EQV1IS,ELDMM5A1R5C7H12-Q0211
SNVSBK8A – OCTOBER 2020 – REVISED MARCH 2021
LM5157x-Q1 2.2-MHz Wide VIN 50-V Boost/SEPIC/Flyback Converter with Dual
Random Spread Spectrum
1 Features
• AEC-Q100 qualified for automotive applications
– Temperature grade 1: –40°C to +125°C TA
Functional Safety-Capable
Documentation available to aid functional safety
system design
• Suited for wide operating range for car battery
applications
– 2.9-V to 45-V input operating range
– 48-V maximum output (50-V abs max)
– Minimum boost supply voltage of 1.5 V when
BIAS ≥ 2.9 V
– Input transient protection up to 50 V
– Minimized battery drain
• Low shutdown current (IQ ≤ 2.6 µA)
• Low operating current (IQ ≤ 700 µA)
• Small solution size and low cost
– Maximum switching frequency up to 2.2 MHz
– 16-pin QFN package (3 mm × 3 mm) with
wettable flanks
– Integrated error amplifier allows primary-side
regulation without optocoupler (flyback)
– Minimized undershoot during cranking (start-
stop application)
– Accurate current limit (see the Device
Comparison Table)
• EMI mitigation
– Selectable dual random spread spectrum
– Lead-less package
• Higher efficiency with low-power dissipation
– 45-mΩ RDSON switch
– Fast switching, small switching loss
• Avoid AM band interference and crosstalk
– Optional clock synchronization
– Dynamically programmable wide switching
frequency from 100 kHz to 2.2 MHz
• Integrated protection features
– Constant current limiting over input voltage
– Selectable hiccup mode overload protection
– Programmable line UVLO
– OVP protection
– Thermal shutdown
• Accurate ±1% accuracy feedback reference
• Adjustable soft start
• PGOOD indicator
• Create a custom design using the LM5157x-Q1
with the WEBENCH® Power Designer
2 Applications
Battery-powered wide input boost, SEPIC, flyback
converter
• Automotive voltage stabilizer in SEPIC
Automotive start-stop application
Automotive emergency call application/backup
battery booster
High voltage LiDAR power supply
Automotive LED bias supply
Multiple-output flyback without optocoupler
• Holdup capacitor charger
Audio amplifier power supply
• Piezo driver/motor driver bias supply
3 Description
The LM5157x-Q1 device is a wide input range, non-
synchronous boost converter with integrated 50-V,
6.5-A (LM5157-Q1) or 50-V, 4.33-A (LM51571-Q1)
power switch.
The device can be used in boost, SEPIC, and flyback
topologies. The device can start up from a single-cell
battery with a minimum of 2.9 V. It can operate with
the input supply voltage as low as 1.5 V if the BIAS
pin is greater than 2.9 V.
Device Information
PART NUMBER
PACKAGE(1)
BODY SIZE (NOM)
LM5157-Q1
LM51571-Q1
WQFN (16)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
VSUPP LY
VLOAD
BIAS VCC SW
UVLO
FB
RT
COMP
SS
PGO OD
PGND AGND MODE
Typical SEPIC Application
CopyrighAtn©I2M0P21OTReTxaAsNInTsNtruOmTeInCtsEInactotrhpeoreatnedd of this data sheet addresses availability, warranty, changes, use iSnusbamfeittyD-corcituicmael anpt pFleiceadtbioancsk,
1
intellectual property matters and other important disclaimers. UNLESS OTHERWISE NOTED, this document contains PRODUCTION
DATA.
Product Folder Links: LM5157-Q1 LM51571-Q1




etcTI

LM51571-Q1 Datasheet Preview

LM51571-Q1 Datasheet

Boost/SEPIC/Flyback Converter

No Preview Available !

LM5157-Q1, LM51571-Q1
SNVSBK8A – OCTOBER 2020 – REVISED MARCH 2021
www.ti.com
Table of Contents
1 Features............................................................................1
2 Applications..................................................................... 1
3 Description.......................................................................1
4 Revision History.............................................................. 2
5 Description (continued).................................................. 2
6 Device Comparison Table...............................................3
7 Pin Configuration and Functions...................................4
8 Specifications.................................................................. 6
8.1 Absolute Maximum Ratings ....................................... 6
8.2 ESD Ratings .............................................................. 6
8.3 Recommended Operating Conditions ........................7
8.4 Thermal Information ...................................................7
8.5 Electrical Characteristics ............................................7
8.6 Typical Characteristics.............................................. 10
9 Detailed Description......................................................13
9.1 Overview................................................................... 13
9.2 Functional Block Diagram......................................... 14
9.3 Feature Description...................................................14
9.4 Device Functional Modes..........................................26
10 Application and Implementation................................ 27
10.1 Application Information........................................... 27
10.2 Typical Application.................................................. 27
10.3 System Examples................................................... 30
11 Power Supply Recommendations..............................34
12 Layout...........................................................................35
12.1 Layout Guidelines................................................... 35
12.2 Layout Examples.................................................... 36
13 Device and Documentation Support..........................37
13.1 Device Support....................................................... 37
13.2 Documentation Support.......................................... 37
13.3 Receiving Notification of Documentation Updates..37
13.4 Support Resources................................................. 38
13.5 Trademarks............................................................. 38
13.6 Electrostatic Discharge Caution..............................38
13.7 Glossary..................................................................38
14 Mechanical, Packaging, and Orderable
Information.................................................................... 39
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision * (October 2020) to Revision A (March 2021)
Page
• Changed the LM51571-Q1 device status from Advance Information to Production Data.................................. 1
5 Description (continued)
The BIAS pin operates up to 45 V (50-V absolute maximum) for automotive load dump. The switching frequency
is dynamically programmable with an external resistor from 100 kHz to 2.2 MHz. Switching at 2.2 MHz minimizes
AM band interference and allows for a small solution size and fast transient response. To reduce the EMI of the
power supply, the device provides a selectable Dual Random Spread Spectrum, which reduces the EMI over a
wide frequency range.
The device features an accurate peak current limit over the input voltage, which avoids overdesigning the power
inductor. Low operating current and pulse-skipping operation improve efficiency at light loads.
The device has built-in protection features such as overvoltage protection, line UVLO, thermal shutdown, and
selectable hiccup mode overload protection. Additional features include low shutdown IQ, programmable soft
start, precision reference, power-good indicator, and external clock synchronization.
2
Submit Document Feedback
Product Folder Links: LM5157-Q1 LM51571-Q1
Copyright © 2021 Texas Instruments Incorporated


Part Number LM51571-Q1
Description Boost/SEPIC/Flyback Converter
Maker etcTI
PDF Download

LM51571-Q1 Datasheet PDF






Similar Datasheet

1 LM51571-Q1 Boost/SEPIC/Flyback Converter
etcTI





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z



Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy