About us Contact Us Submit BOM
RFQs(0)
English
Close Menu
View All

Please refer to the English Version as our Official Version.Return

Europe
France(Français) Germany(Deutsch) Italy(Italia) Russian(русский) Poland(polski) Czech(Čeština) Luxembourg(Lëtzebuergesch) Netherlands(Nederland) Iceland(íslenska) Hungarian(Magyarország) Spain(español) Portugal(Português) Turkey(Türk dili) Bulgaria(Български език) Ukraine(Україна) Greece(Ελλάδα) Israel(עִבְרִית) Sweden(Svenska) Finland(Svenska) Finland(Suomi) Romania(românesc) Moldova(românesc) Slovakia(Slovenská) Denmark(Dansk) Slovenia(Slovenija) Slovenia(Hrvatska) Croatia(Hrvatska) Serbia(Hrvatska) Montenegro(Hrvatska) Bosnia and Herzegovina(Hrvatska) Lithuania(lietuvių) Spain(Português) Switzerland(Deutsch) United Kingdom(English)
Asia/Pacific
Japan(日本語) Korea(한국의) Thailand(ภาษาไทย) Malaysia(Melayu) Singapore(Melayu) Vietnam(Tiếng Việt) Philippines(Pilipino)
Africa, India and Middle East
United Arab Emirates(العربية) Iran(فارسی) Tajikistan(فارسی) India(हिंदी) Madagascar(malaɡasʲ)
South America / Oceania
New Zealand(Maori) Brazil(Português) Angola(Português) Mozambique(Português)
North America
United States(English) Canada(English) Haiti(Ayiti) Mexico(español)
HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - DC DC Switching ControllersLM51551DSST
LM51551DSST Image
LM51551DSST Image - 1
Image may be representation.
See specifications for product details.
Share
 Favorite
EXPRESS OPTION
Payment method

LM51551DSST - Texas Instruments

Manufacturer Part Number
LM51551DSST
Manufacturer
Texas Instruments
Allelco Part Number
32D-LM51551DSST
Warranty
1 Year Allelco Warranty - Find out more
Parts Description
2.2MHZ WIDE VIN NON-SYNCHRONOUS
Package
12-WSON (3x2)
Data sheet
1.LM51551DSST.pdf ...

HTML Datasheet

LM5155.pdf
RoHs Status
ROHS3 Compliant
Compare
Our certification
In stock: 29308

Required fields are indicated by an asterisk (*)
Please send RFQ, we will respond immediately.

Quantity
EXPRESS OPTION
Payment method
Our certification

Specifications

LM51551DSST Tech Specifications
Texas Instruments - LM51551DSST technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - LM51551DSST

Product Attribute Attribute Value  
Manufacturer Texas Instruments  
Voltage - Supply (Vcc/Vdd) 2.97V ~ 45V  
Topology Boost, Flyback, SEPIC  
Synchronous Rectifier No  
Supplier Device Package 12-WSON (3x2)  
Series -  
Serial Interfaces -  
Package / Case 12-WFDFN Exposed Pad  
Package Tape & Reel (TR)  
Output Type Transistor Driver  
Output Phases 1  
Product Attribute Attribute Value  
Output Configuration Positive  
Operating Temperature -40°C ~ 125°C (TJ)  
Number of Outputs 1  
Mounting Type Surface Mount  
Function Step-Up, Step-Up/Step-Down  
Frequency - Switching 100kHz ~ 2.2MHz  
Duty Cycle (Max) 96%  
Control Features Soft Start  
Clock Sync Yes  
Base Product Number LM51551  

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 2 (1 Year)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

Manufacturer Part Number

LM51551DSST

Manufacturer

Texas Instruments

Introduction

The LM51551DSST is a high-performance, synchronous step-up/step-down (buck-boost) DC/DC controller from Texas Instruments. It is designed to provide a regulated output voltage from a wide range of input voltages.

Product Features and Performance

Wide input voltage range: 2.97V to 45V

Switching frequency range: 100kHz to 2.2MHz

Supports boost, flyback, and SEPIC topologies

Integrated high-side and low-side MOSFET drivers

Soft-start function for controlled startup

Clock synchronization capability

Maximum duty cycle of 96%

Single-phase operation

Thermally enhanced 12-WSON (3x2) package

Product Advantages

Wide input voltage range for versatile applications

High-efficiency power conversion

Flexible topology support

Integrated driver simplifies design

Soft-start and clock sync for system-level optimization

Small, thermally enhanced package

Key Technical Parameters

Input voltage range: 2.97V to 45V

Switching frequency: 100kHz to 2.2MHz

Maximum duty cycle: 96%

Output configuration: Positive

Synchronous rectifier: No

Number of outputs: 1

Quality and Safety Features

RoHS3 compliant

Suitable for industrial and automotive applications

Compatibility

The LM51551DSST is compatible with a wide range of electronic systems and devices that require a regulated power supply within its input and output specifications.

Application Areas

Industrial equipment

Automotive electronics

Portable devices

Power supplies

Battery-powered systems

Product Lifecycle

The LM51551DSST is an active product from Texas Instruments and is not nearing discontinuation. Replacement or upgrade options may be available as technology evolves.

Key Reasons to Choose This Product

Wide input voltage range for versatile applications

High-efficiency power conversion with flexible topology support

Integrated driver simplifies design and reduces component count

Soft-start and clock synchronization for system-level optimization

Small, thermally enhanced package for compact designs

RoHS3 compliance for use in a variety of applications

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments LM51551DSST

Product Attribute LM51551QDSSTQ1 LM51551DSSR LM51551QDSSRQ1 LM5155QDSSRQ1
Part Number LM51551QDSSTQ1 LM51551DSSR LM51551QDSSRQ1 LM5155QDSSRQ1
Manufacturer Texas Instruments Texas Instruments Texas Instruments Texas Instruments
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Output Type - Current - Unbuffered Voltage - Buffered -
Output Configuration - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Voltage - Supply (Vcc/Vdd) - - - -
Number of Outputs - - - -
Function - - - -
Control Features - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Output Phases - - - -
Topology - - - -
Clock Sync - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Frequency - Switching - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Series - - - -
Synchronous Rectifier - - - -
Duty Cycle (Max) - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Serial Interfaces - - - -

LM51551DSST Datasheet PDF

Download LM51551DSST pdf datasheets and Texas Instruments documentation for LM51551DSST - Texas Instruments.

HTML Datasheet
LM5155.pdf

Customers Also Interested in

Recommended Products

Customer Reviews

Evaluation: 10 Articles

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

  • Daic***K.
    Mar 23, 2026

    Very good. No issue after long time testing.

  • Kevi***.
    Mar 17, 2026

    Fast switching and stable output. Very satisfied with this IC

  • Daou***hekebkeb
    Jun 16, 2024

    I had a great experience purchasing items from Allelcoelec, I recommend

  • Uri ***al
    Jun 19, 2024

    Good comunication,
    Transpnt regarding the process and price.

  • Yaqu***l Ali
    Jun 19, 2024

    Providing reasonable prices, regular follow-up of orders, providing accurate and regular invoices, timely delivery of goods, excellent customer service and providing original goods and best quality materials.

  • Lea ***
    Jun 19, 2024

    Morrey was very helpful and right on top of things!
    He replied quickly to my RFQ. He was very courteous and professional.

Write a Review

Your Email address will not be published.

Shipment

Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

Delivery Cost

  1. Use your express account for shipment if you have one.
  2. Use our account for the shipment. Refer to the table below for the approximate charges.
(Different time frame / countries / package size has different price.)

Delivery Method

  1. Global Common Shipment by DHL / UPS / FedEx / TNT / EMS / SF we support.
  2. Others more shipping ways, please get in touch with your customer manager.

Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.

Payment Support

The payment method can be chosen from the methods shown below: Wire Transfer (T/T, Bank Transfer), Western Union, Credit card, PayPal.

Your Faithful Supply Chain Partner -

Contact us if you have any questions.

  1. Phone
    +00852 9146 4856

Certifications & Memberships

View More
LM51551DSST Image

LM51551DSST

Texas Instruments
32D-LM51551DSST

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

Allelco
About Us
History
Certifications
Recruitment
Policies
Terms & Conditions
Privacy Policy
Cookie Policy
Services
Order Tracking
Return & Replacement
Frequently Asked Questions
Contact Us
Order
Shipping & Delivering
Payment Methods
My Account
The BlogsHot PartsChange LanguageNewsSite map
Contact Us
Headquarters Address:
Room C 13/F Harvard Commercial Building
105-111 Thomson Road Wan Chai
HongKong
Service Tel: +852-91464856
Service Email: info@allelco.com
Follow us
Copyright © 2012-2025 AllelcoElec.com. All rights reserved.
0 RFQ
Shopping cart (0 Items)
It is empty.
Submit RFQ
Compare List (0 Items)
It is empty.
Feedback

Your feedback matters! At Allelco, we value the user experience and strive to improve it constantly.
Please share your comments with us via our feedback form, and we'll respond promptly.
Thank you for choosing Allelco.

Subject
E-mail
Comments
Captcha
Drag or click to upload file
Upload File
types: .xls, .xlsx, .doc, .docx, .jpg, .png and .pdf.
Max file size: 10MB