LTC3780IG

Synchronous 4-Switch Buck-Boost Controller, 4V-36V In, 98% Eff, SSOP-28

11885

Effective Inventory
Go to Inquiry

Image for reference only

Manufacturer Part：

LTC3780IG

Package：

SSOP-28, 10.2 x 5.3 x 1.95 mm

Brand：
Product Categories：
Quality Commitment
Shipping & Payment
Service & Packaging
Product Manual
Other recommendations you may be interested in.

OC5A2B00

NCV887103D1R2G

NAE12S17-A

MIC4428YM

MIC2951-03BN

LTM4673Y

LTC3112EFE

LTC2955CTS8-1

Description

Product Overview

The LTC3780IG is a high-efficiency synchronous four-switch buck-boost switching regulator controller from Analog Devices. Operating from a 4V to 36V input with a 0.8V to 34V output range, this device delivers seamless transitions between buck, boost, and buck-boost modes using a single inductor. Constant frequency current-mode control with programmable 200kHz-400kHz switching frequency and phase-lockable capability provides predictable operation and easy EMI management. With synchronous rectification achieving up to 98% efficiency, the LTC3780 is ideal for high-power automotive, industrial, and telecom applications where the input voltage varies above and below the output voltage.

Key Specifications

Parameter Value
Manufacturer Analog Devices
Part Number LTC3780IG
Product Category Synchronous Buck-Boost Controllers
Topology 4-Switch Buck-Boost Controller (external MOSFETs)
Input Voltage Range 4V to 36V
Output Voltage Range 0.8V to 34V (adjustable)
Output Current Up to 10A+ (depends on external MOSFETs)
Switching Frequency 200kHz to 400kHz (programmable)
Control Mode Current mode, constant frequency
Peak Efficiency Up to 98% (synchronous rectification)
Package / Case SSOP-28
Operating Temperature -40°C to +125°C

Features

  • Wide 4V to 36V input voltage range
  • Wide 0.8V to 34V output voltage range
  • Single inductor architecture (four switches)
  • Synchronous rectification: up to 98% efficiency
  • Constant frequency current mode control
  • Programmable switching frequency: 200kHz to 400kHz
  • Phase-lockable frequency (external sync)
  • Power good (PGOOD) output flag
  • Output overvoltage protection
  • Programmable soft-start
  • Thermal shutdown protection
  • SSOP-28 package

Applications

  • Automotive and industrial power supplies
  • Battery-powered equipment and UPS systems
  • Distributed power systems and intermediate buses
  • Telecom power supplies (24V/48V)
  • High-power LED drivers
  • 12V to 12V battery backup and regulation

The LTC3780IG is a high-performance synchronous four-switch buck-boost controller from Analog Devices. This controller drives external N-channel MOSFETs to form a complete buck-boost power supply that can operate from input voltages above, below, or equal to the output voltage. This makes it suitable for applications where the input varies significantly, such as automotive systems with cold-crank and load-dump conditions, battery backup systems, and telecom 24V/48V infrastructure.

Using a single inductor four-switch topology, the LTC3780 provides seamless transitions between buck mode (VIN > VOUT), boost mode (VIN < VOUT), and buck-boost mode (VIN ≈ VOUT). The controller uses current-mode control with constant frequency operation, providing excellent line and load transient response as well as easy input filter design for EMI compliance. Synchronous rectification (all four switches are MOSFETs, no diodes) achieves very high efficiency — up to 98% — by eliminating the forward voltage drop of Schottky diodes. The switching frequency is programmable from 200kHz to 400kHz via a single resistor, and can be synchronized to an external clock for multi-phase operation or noise-sensitive applications. Key features include a power good output, output overvoltage protection, programmable soft-start, and thermal shutdown. The SSOP-28 package provides a compact solution with standard pin spacing for easy PCB layout. The LTC3780 is available in industrial (-40°C to +125°C) and commercial grades.

The LTC3780 is a four-switch buck-boost controller with current-mode control:

1. Four-Switch Topology: The controller drives four external N-channel MOSFETs arranged around a single inductor. Switches A (top-left) and D (bottom-left) form the input-side pair, while switches B (top-right) and C (bottom-right) form the output-side pair. The inductor is connected between the two switch nodes (SW1 and SW2).

2. Buck Mode Operation: When VIN > VOUT, the converter operates in buck mode. Switch A is always on, switch D is always off. Switches B and C alternate like a standard buck converter, stepping down the input voltage. The current through the inductor flows from left to right.

3. Boost Mode Operation: When VIN < VOUT, the converter operates in boost mode. Switch B is always on, switch C is always off. Switches A and D alternate like a standard boost converter, stepping up the input voltage. Inductor current still flows left to right. 4. Buck-Boost Mode Transition: When VIN is close to VOUT, the controller enters buck-boost mode where all four switches operate in a carefully timed sequence. This provides seamless transition through the VIN = VOUT point without output voltage glitches or excessive ripple. 5. Current-Mode Control: The LTC3780 uses peak current-mode control. The error amplifier sets a target peak inductor current. The current sense comparator terminates each switching cycle when the inductor current reaches this threshold. This provides inherent cycle-by-cycle current limiting and good line transient response. 6. Frequency and Synchronization: An internal oscillator sets the switching frequency, programmable from 200kHz to 400kHz with an external resistor. The PLLIN pin allows synchronization to an external clock, enabling multiple converters to operate at the same frequency (reducing beat frequencies) or to be phase-shifted for interleaved multi-phase operation. 7. Protection Features: Output overvoltage protection (OVP) clamps the output if it exceeds the regulation level by more than 10%. Current limit protects the MOSFETs and inductor from overcurrent. Thermal shutdown disables the controller at excessive junction temperatures. Soft-start gradually ramps the output voltage to limit inrush current.

Pin Name Type Description
1 RUN/SS I/O Run / soft-start. Pull above 1.5V to enable. Capacitor to GND programs soft-start time.
2 FB Input Feedback input. Connect resistor divider from VOUT to FB to GND. Regulation point = 0.8V.
3 ITH Comp Current threshold / loop compensation. Connect RC network to GND for compensation of the current-mode control loop.
4 PLLIN/MODE Input PLL synchronization input / mode select. External clock for sync, or tie to GND/VCC for mode selection.
5 RT Input Frequency programming. Resistor to GND sets oscillator frequency (200kHz to 400kHz).
6 PLLFLTR Comp PLL filter pin. Connect RC network to GND for PLL loop filter when using synchronization.
7 PGOOD Output Power-good open-drain output. Pulled low when VOUT is out of regulation by more than ±7.5%.
8 EXTVCC Input External VCC supply. Connect to VOUT if VOUT > 5V to power the IC from the output for higher efficiency.
9 INTVCC Output Internal 5V regulator output. Bypass with 1µF ceramic capacitor to GND.
10 VIN Power Input Main input voltage supply (4V to 36V). Bypass with ceramic capacitor to GND.
11 BG1 Output Bottom gate drive 1 (input side low-side MOSFET gate). Connect to gate of switch D.
12 TG1 Output Top gate drive 1 (input side high-side MOSFET gate). Connect to gate of switch A via bootstrap circuit.
13 SW1 I/O Switch node 1 (input side). Connect to source of switch A, drain of switch D, and one end of inductor.
14 SENSE+ Input Current sense positive input. Connect to VIN side of sense resistor.
15 SENSE- Input Current sense negative input. Connect to SW1 side of sense resistor.
16 SGND Ground Signal ground. Low-current reference ground for control circuitry.
17 PGND Ground Power ground. High-current ground return for gate drivers.
18 BG2 Output Bottom gate drive 2 (output side low-side MOSFET gate). Connect to gate of switch C.
19 TG2 Output Top gate drive 2 (output side high-side MOSFET gate). Connect to gate of switch B via bootstrap circuit.
20 SW2 I/O Switch node 2 (output side). Connect to source of switch B, drain of switch C, and other end of inductor.
21 VOUT Output Output voltage sense. Connect to output rail for overvoltage protection and EXTVCC detection.
22-28 N/C or GND — Additional pins — refer to datasheet for exact pinout (SSOP-28).
  • Automotive 12V systems with cold-crank and load-dump
  • Industrial 24V to 12V/5V/3.3V high-current supplies
  • Telecom 48V to 24V/12V intermediate bus converters
  • UPS and battery backup systems (charge/discharge regulation)
  • High-power constant current LED drivers
  • Solar MPPT battery charging systems
Manufacturer Part Number Package Notes
Analog Devices LTC3112 TSSOP-20 Integrated 2.5A buck-boost (lower power)
Analog Devices LTC3789 QFN-32 High efficiency synchronous buck-boost
Analog Devices LTC3729 SSOP-28 Dual phase buck-boost controller
Texas Instruments LM5175 QFN-28 4-switch buck-boost controller
Texas Instruments LM5176 HTSSOP-28 55V buck-boost controller
MPS MP8755 QFN Synchronous buck-boost alternative
Recommend Parts

OC5A2B00

High-voltage buck LED driver, 6-60V input, constant current up to 3A, PWM+analog dimming, ESOP-8

Brand:

Package:

ESOP-8 (4.9 x 3.9 x 0.8 mm, exposed thermal pad)

In stock:

6500pcs

Cargo cycle: 3~7 Days
The minimum order is 1

Go to Inquiry

NCV887103D1R2G

Automotive boost controller, 3.2-40V input, 340kHz, peak current mode, AEC-Q100, SOIC-8

Brand:

Package:

SOIC-8 (4.9 x 3.9 x 1.5 mm, 1.27mm pitch)

In stock:

10000pcs

Cargo cycle: 3~7 Days
The minimum order is 1

Go to Inquiry

NAE12S17-A

17W isolated DC-DC converter, 12V input, 15V output, 1500VDC isolation, DIP package, industrial

Brand:

Package:

DIP Module (50.8 x 25.4 x 10.2 mm, through-hole)

In stock:

2400pcs

Cargo cycle: 3~7 Days
The minimum order is 1

Go to Inquiry

MIC4428YM

Dual 1.5A low-side MOSFET driver, 4.5-18V, 15ns rise time, TTL/CMOS input, SOIC-8, industrial

Brand:

Package:

SOIC-8 (150 mils body width)

In stock:

8400pcs

Cargo cycle: 3~7 Days
The minimum order is 1

Go to Inquiry

MIC2951-03BN

3.0V 500mA LDO regulator, ultra-low dropout 58mV, 26V input, reverse battery protection, TO-263-5

Brand:

Package:

TO-263-5 (D2PAK, 10.16 x 10.67 mm)

In stock:

9100pcs

Cargo cycle: 3~7 Days
The minimum order is 1

Go to Inquiry

LTM4673Y

Quad-Output 5A Digital μModule Regulator, PMBus, 4.5V-17V In, BGA-144

Brand:

Package:

BGA-144 (15 x 9 x 3.42 mm)

In stock:

4236pcs

Cargo cycle: 3~7 Days
The minimum order is 1

Go to Inquiry
Quality Assurance

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:
  • Automotive Electronics: All automotive-grade components pass AEC-Q series certification, featuring excellent stability and durability to adapt to complex vehicle operating environments.
  • Medical Devices: 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.

Contact Us

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

 

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

 

Shipping & Payment

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
  1. Shipping Fee Rules
  • Shipping cost is calculated based on package weight, volume, destination and delivery method.
  • Both freight prepaid and freight collect are available. Please provide your courier account number in advance if you choose freight collect.
  • Free international express delivery is offered for large orders. Terms for long-term partners can be negotiated separately.
  1. Shipment Tracking
     

    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.

  2. Handling of Lost or Damaged Goods
  • 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.
  • We shall not be liable for any losses caused by incorrect delivery address, wrong contact information or the buyer’s refusal to complete customs clearance.

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@ic-vendor.com

Tel / WhatsApp: +86 13760382860

Service & Packaging

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;
  • Shockproof buffer materials are added for fragile products to ensure transportation safety;
  • 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@ic-vendor.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

Online Inquiry Form

Support Excel, PDF, CSV format files for full BOM list quotation

Submit your component procurement and custom packaging needs via the form below. We will provide a detailed quotation and professional solution within 1–8 working hours.

Company
insights
Industries
All Products
Integrated Circuits
C&I Devices
Discrete
Memory Chips
MPUs & MCUs