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LM5155XSS

65V boost/flyback/SEPIC controller, 2.2MHz, spread-spectrum, 100V/2A gate, ±1% Vref, WQFN-16

4500

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制造商零件：

LM5155XSS

包装：

WQFN-16 (4.0 x 4.0 x 0.8mm)

品牌：
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说明

产品概览

The LM5155XSS is a 2.2MHz automotive-grade boost/flyback/SEPIC controller from Texas Instruments with 3.5V to 65V input range and 100V/2A gate driver. The spread-spectrum option (X suffix) reduces EMI. With 1µA shutdown current, ±1% reference accuracy, programmable soft start, and slope compensation, it supports high-power non-isolated and isolated power supply designs in a WQFN-16 (4x4mm) package.

主要规格

拓扑结构 Boost / Flyback / SEPIC Controller
输入电压 3.5V to 65V
Gate Drive Voltage 100V maximum / 2A peak
开关频率 100kHz to 2.2MHz (resistor programmable)
Spread Spectrum Yes (X suffix, ±7% frequency dithering)
Reference Voltage 1V (±1% over temperature)
Quiescent Current (ON) 500µA typical
关机电流 1µA typical
Duty Cycle Up to 92%
控制模式 Current mode (peak)
Slope Compensation Internal, programmable with Rslope
Soft Start Programmable (external capacitor)
VCC LDO 7.2V internal, bypassable for external bias
Enable/UVLO Adjustable with hysteresis
Protection OCP, OVP, thermal shutdown
包装 WQFN-16 (4.0 x 4.0mm)
工作温度 -40°C to +125°C
资格 AEC-Q100

特点

  • 3.5V to 65V wide input voltage range
  • 100V/2A gate driver for external N-FET
  • Up to 2.2MHz switching frequency
  • Spread-spectrum frequency dithering (±7%) for EMI reduction
  • ±1% reference voltage accuracy
  • Current-mode control with programmable slope compensation
  • 1µA shutdown current
  • Adjustable UVLO with hysteresis
  • Programmable soft start
  • Output overvoltage and cycle-by-cycle overcurrent protection
  • Internal 7.2V VCC LDO (bypassable)
  • AEC-Q100 qualified

应用

  • Automotive LED headlight boost drivers
  • Industrial PLC power supplies
  • Telecom 48V isolated flyback
  • SEPIC converters for battery-powered systems
  • Boost converters for automotive ADAS
  • Multi-output flyback for IGBT gate drivers

The LM5155XSS is a high-performance non-synchronous boost/flyback/SEPIC controller from Texas Instruments designed for automotive and industrial power supply applications. It features a 3.5V to 65V input range and drives an external N-channel MOSFET with a 100V/2A gate driver, supporting output voltages up to 100V. The X suffix denotes the spread-spectrum feature, which dithers the switching frequency by ±7% to reduce peak EMI emissions — critical for passing automotive CISPR 25 radiated emissions tests. The 2.2MHz maximum switching frequency allows small inductors and places switching harmonics above the AM radio band. Current-mode control with programmable slope compensation ensures stable operation across wide input/output ranges. The ±1% reference accuracy provides tight output regulation. The 1µA shutdown current preserves battery life in always-connected automotive systems.

The LM5155XSS uses peak current-mode control. In each switching cycle, the oscillator sets the RS flip-flop, turning on the external N-channel MOSFET. Current ramps in the inductor (boost) or primary winding (flyback), sensed by the CS pin through an external sense resistor. When the sensed current reaches the error amplifier’s command level (plus slope compensation), the flip-flop resets and the MOSFET turns off. The inductor current then flows through the output diode to the load. The error amplifier compares a fraction of the output voltage (via the FB pin) with the internal 1V reference, adjusting the peak current command to maintain regulation. Slope compensation (programmable via an external resistor from COMP to SLOPE) prevents sub-harmonic oscillation at duty cycles above 50%. The spread-spectrum feature modulates the oscillator frequency with a pseudo-random pattern, spreading the switching energy across a wider bandwidth and reducing peak EMI at any single frequency. The internal 7.2V VCC LDO can be bypassed by connecting an external supply to VCC for higher efficiency at high input voltages.

针脚 名称 说明
1 VIN Input supply (3.5V to 65V)
2 EN/UVLO Enable/UVLO adjust
3 RT Switching frequency programming resistor
4 SS Soft start capacitor
5 COMP Error amplifier output / loop compensation
6 SLOPE Slope compensation resistor
7 FB Feedback voltage (target 1V)
8 AGND Analog ground
9 CS Current sense input
10 PGND Power ground
11 GATE Gate driver output (to external N-FET)
12 VCC Internal 7.2V LDO output (bypass cap)
13 OV Output overvoltage sense
14 北卡罗来纳州 无连接
15 北卡罗来纳州 无连接
16 PG Power good output (open drain)
  • Automotive LED Headlight Boost: Boost the 12V battery to 48V at 2A for an LED headlight string. The 2.2MHz switching frequency places harmonics above the AM band, and the spread-spectrum feature reduces EMI peaks to pass CISPR 25 Class 5. The 100V gate driver supports the 48V output with margin. Current-mode control provides fast LED current regulation during automotive transients (ISO 7637 pulse testing).
  • 48V Telecom Isolated Flyback: Generate isolated ±12V at 1A from a 48V telecom bus using a flyback topology. The LM5155 drives the primary MOSFET; a coupled inductor provides isolation and multiple outputs. The ±1% reference ensures tight primary-side regulation. The 65V input rating accommodates the 48V ±20% input range (38V to 72V including transients).
  • SEPIC for Wide Input Battery: Build a SEPIC converter that accepts 6V to 36V (2S to 8S Li-ion) and delivers a regulated 12V at 2A. The SEPIC topology handles input voltages both above and below the output, unlike a boost converter. The spread-spectrum option reduces EMI that could interfere with sensitive RF circuits in the same enclosure.
模型 Vin Topologies 主要区别
LM5155SS 3.5-65V Boost/Flyback/SEPIC No spread spectrum
LM5156 3.5-65V Boost/Flyback/SEPIC Higher gate drive, HV start-up
LM5180 4-65V Flyback (integrated FET) Integrated 1.5A FET, lower power
MAX17597 4.5-60V Boost/Flyback ADI/Maxim, no spread spectrum
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质量保证

Quality is the core foundation of our long-term global cooperation. With over 20 years of experience in the electronic component industry, Materialparts has built a strict and standardized quality management system covering component sourcing, incoming inspection, full-batch testing, packaging and delivery. We are committed to delivering 100% genuine, high-reliability electronic components for industrial control, automotive electronics, consumer electronics and medical device industries, and fully safeguarding your production and R&D projects.

1. Authorized & Genuine Sourcing Promise

All of our electronic components are procured from official authorized distributors and original manufacturers. We strictly reject counterfeits, refurbished parts, disassembled components and gray-market goods. Every product is guaranteed to be brand-new original parts and fully consistent with the original technical parameters. For branded products such as NXP IC series, we maintain complete supply channel documents to realize full product traceability.

2. Strict Full-batch Quality Inspection

We implement 100% full-batch quality control for all goods before shipment. Our professional QC team conducts multi-dimensional tests including appearance inspection, electrical parameter testing, performance verification and packaging check. Each batch of components is attached with complete inspection reports and batch records. We stick to zero-tolerance standards for defective products to ensure every piece of component meets industrial application requirements.

3. Industry Standard Compliance

Our products comply with a variety of international industry quality standards to adapt to high-standard application scenarios:
  • 汽车电子: All automotive-grade components pass AEC-Q series certification, featuring excellent stability and durability to adapt to complex vehicle operating environments.
  • 医疗设备: High-reliability components meet medical industry safety and compliance regulations, ensuring stable operation for medical equipment.
  • Industrial Control & Consumer Electronics: Products conform to universal international electronic industry standards, suitable for long-term continuous operation of various equipment.

4. Professional Reliability Control

For static-sensitive, moisture-sensitive and precision components such as ICs, PCBs, sensors and connectors, we carry out reliability screening in advance. Combined with standardized ESD anti-static packaging and vacuum moisture-proof packaging, we avoid component damage caused by static electricity, dampness or collision during storage and transportation, and retain the original performance of products.

5. Traceability Management System

We establish a complete product traceability system. Each batch of goods corresponds to independent batch number, sourcing record, inspection record and delivery record. Customers can query the whole lifecycle information of components at any time. This system effectively solves quality risks and facilitates after-sales handling and production quality control for your company.

6. After-sales Quality Guarantee

If any product is confirmed to have non-conformity quality problems due to our reasons after receipt, we provide free return, exchange and supplementary delivery services. Our professional quality team will also conduct root cause analysis to optimize our quality control process. We respond to quality feedback within 24 hours to resolve your worries efficiently.

联系我们

If you have inquiries about our quality standards, inspection procedures or product certification documents, please feel free to contact us:

 

Email: info@materialparts.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China

 

发货与付款

Materialparts is a professional global supplier of electronic components with over 20 years of industry experience. We provide one-stop supply of passive components, integrated circuits, as well as parts for industrial control, automotive electronics, consumer electronics and medical devices. Below are the unified shipping and payment policies applicable to all orders, samples and bulk purchases worldwide.

1. Payment Terms

We offer a variety of secure and convenient payment methods to meet diverse business cooperation needs. Details are as follows:
  1. Accepted Payment Methods
  • T/T (Bank Wire Transfer): The primary settlement method for bulk orders and a widely used international payment channel.
  • PayPal: Ideal for small orders, sample orders and quick payments.

  1. Settlement Currency

     

    US Dollar (USD) is the default settlement currency. RMB is available for domestic customers.

  2. Bank Charges

     

    All transfer fees, intermediary bank charges and other remittance-related expenses shall be borne by the buyer.

  3. Payment Requirements
  • Sample and small orders: Shipment will be arranged upon full payment.
  • In-stock bulk orders: Goods will be delivered within 2 to 3 working days after full payment.

2. Shipping & Delivery

We partner with leading global logistics providers to ensure safe and fast delivery worldwide. Relevant details are listed below:
  1. Logistics Partners
  • International Express: DHL, FedEx, UPS, TNT
  • Economy Logistics: Air freight and sea freight for large-volume cargo
  • Domestic Delivery: SF Express, Yunda Express
  1. Order Processing Time
  • In-stock items: Orders confirmed and fully paid before 14:00 (GMT+8) will be shipped on the same day. All other orders will be dispatched within 1 to 2 working days.
  • Out-of-stock or sourced items: The delivery lead time will be confirmed separately according to brand and inventory status.
  1. Estimated Transit Time
  • International Express: 3 – 7 working days globally
  • Air Freight: 7 – 12 working days
  • Sea Freight: 25 – 40 working days for heavy and large bulk cargo
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  • Free international express delivery is offered for large orders. Terms for long-term partners can be negotiated separately.
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    Within 24 hours after dispatch, we will send the tracking number, commercial invoice, packing list and other documents to your email or communication account. You may check the shipment status online in real time.

3. General Order Rules & Notes

  1. MOQ & Sample Service

     

    We support flexible minimum order quantities for samples, small-batch and large-batch orders. All sample orders shall comply with the above shipping and payment policies.

  2. Packaging Standard

     

    All electronic components are packed with professional anti-static and shockproof materials. Original factory packaging is available for branded chips and integrated circuits.

4. Customs & Liability Statement

  1. Import Duties & Taxes

     

    All import duties, customs clearance fees and local taxes incurred for international shipments shall be borne by the buyer. We will provide complete customs documents to assist you with clearance procedures.

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  • In case of loss or severe damage during transit, please contact us within 48 hours after receiving the tracking information. We will assist you in filing a claim with the logistics provider.
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5. Local Pickup in Shenzhen

Local pickup service is available for customers in Shenzhen and surrounding areas:
  • Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong Province, China
  • Business Hours: 09:00 – 18:00, Monday to Friday. Closed on weekends and official public holidays.
  • Notice: Please make an appointment via email or communication tools one day in advance, and present your order information upon pickup.

Contact Information

Email: info@materialparts.com

Tel / WhatsApp: +86 13760382860

服务与包装

Materialparts is a professional electronic component supplier based in Shenzhen, China, with over 20 years of global trading experience. We integrate component procurement, quality inspection, technical support, customized packaging, and global delivery services to provide one-stop supply chain solutions. Our business covers industrial control, automotive electronics, consumer electronics, medical devices and other industries. We always adhere to genuine sources, stable supply and considerate after-sales service.

Core Services

1. One-stop Sourcing & BOM Support

We specialize in a full range of passive and active electronic components, including SMD resistors, power resistors, connectors, aviation connectors, LED beads, flexible circuit boards, printed circuit boards, and integrated circuits. Our professional team provides BOM list consolidation, component matching, and alternative model recommendation services. We support sample orders, small-batch trial production, and mass production orders with flexible MOQs to meet diverse procurement needs.

2. Genuine Product Guarantee & Full-process Quality Inspection

All products are sourced from official authorized channels and are 100% original genuine parts. Every batch of goods undergoes strict full-process quality inspection before delivery, with complete batch records and traceability documents provided. Our products comply with AEC-Q standards for automotive electronics and high-reliability specifications for medical devices. We eliminate counterfeits, refurbished parts and defective products from the source to secure your project production.

3. Fast Quotation & Order Processing

Our customer service team responds promptly to inquiries and quotation requests. All in-stock orders will be processed within one working day. We provide stocking reservation services for long-term cooperative customers, effectively solving problems such as component shortages and unstable supply chains.

4. Professional Technical Support

Our senior engineer team provides free technical consultation, model selection guidance and original manufacturer datasheets. We assist customers in solving problems related to product R&D, circuit design and component application, providing reliable technical support for project progress.

5. Sourcing for Special Components

Relying on our global supply chain network, we professionally source scarce components, obsolete parts and customized special components to efficiently solve your procurement difficulties.

6. Global Logistics & Document Services

We cooperate with mainstream international logistics providers including DHL, FedEx, UPS and TNT to achieve fast global delivery. We can provide complete export documents such as customs declaration files, commercial invoices and packing lists to ensure smooth customs clearance for international shipments. Local pickup is also available for customers in Shenzhen, China.

Professional Packaging Standards

Electronic components are sensitive to static electricity, collision, moisture and dust. We adopt industry-standard anti-static packaging solutions to fully ensure the integrity of goods during transportation and storage.

1. General Packaging Specifications

  • All components are packed separately to avoid damage caused by friction and collision;
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  • Each package is clearly marked with part number, quantity, batch number and specifications for easy inventory counting and management.

2. Classified Professional Packaging

  • Anti-static Packaging: Static-sensitive components such as chips, circuit boards and sensors are packaged with anti-static bags, shielding boxes and conductive foam in strict accordance with international anti-static standards to prevent static damage.
  • Vacuum Moisture-proof Packaging: Moisture-sensitive components are vacuum-sealed with desiccants to isolate humid air, suitable for ocean transportation and long-term storage.
  • Original Factory Packaging: Integrated circuits of brands such as NXP are delivered with original reels, trays or tubes by default, retaining complete original packaging and adapting to automated SMT production lines.
  • Discrete Device Packaging: Discrete devices such as SMD resistors, power resistors and LEDs are quantitatively and classifiedly packaged with accurate quantity and clear marking.
  • Connector / Aviation Connector Packaging: Hard outer packaging is adopted to prevent pin bending and structural deformation.

3. Custom Packaging Services

We provide value-added services including personalized packaging, custom labeling and re-reeling according to customer requirements, fully matching your production and warehouse management standards.

Contact Information

For service consultation or packaging customization, please feel free to contact us:
Email: info@materialparts.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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