LTC3112EFE

2.5A Synchronous Buck-Boost Converter, 2.7V-40V In, 1V-38V Out, TSSOP-20

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Manufacturer Part：

LTC3112EFE

Package：

TSSOP-20, 6.5 x 4.4 x 1.0 mm

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Description

Product Overview

The LTC3112EFE is a high-efficiency 2.5A synchronous buck-boost DC-DC converter from Analog Devices, capable of operating from input voltages above, below, or equal to the output voltage. With a wide 2.7V to 40V input range and 1V to 38V adjustable output, this device is ideal for battery-powered applications where the input voltage varies across the output voltage level (e.g., single-cell Li-ion to 3.3V, or multi-cell alkaline to 5V). Synchronous rectification delivers efficiencies up to 95%, while Burst Mode® operation reduces quiescent current to just 35µA for extended battery life. The TSSOP-20 package provides a compact solution for industrial, automotive, solar-powered, and battery-powered systems.

Key Specifications

Parameter Value
Manufacturer Analog Devices
Part Number LTC3112EFE
Product Category Synchronous Buck-Boost Converters
Topology 4-Switch Buck-Boost (SEPIC alternative)
Input Voltage Range 2.7V to 40V
Output Voltage Range 1V to 38V (adjustable)
Output Current 2.5A continuous (buck mode, VIN=12V, VOUT=5V)
Switching Frequency 100kHz to 2MHz (programmable)
Peak Efficiency Up to 95% (synchronous rectification)
Quiescent Current 35µA (Burst Mode operation)
Package / Case TSSOP-20
Operating Temperature -40°C to +125°C

Features

  • Wide 2.7V to 40V input voltage range
  • Wide 1V to 38V output voltage range
  • 2.5A continuous output current (buck mode conditions)
  • Synchronous rectification: up to 95% efficiency
  • Programmable switching frequency: 100kHz to 2MHz
  • Burst Mode operation: 35µA quiescent current for light loads
  • Seamless transitions between buck, boost, and buck-boost modes
  • Programmable soft-start
  • Output disconnect during shutdown
  • Thermal overload and short-circuit protection
  • TSSOP-20 package with exposed pad for thermal performance

Applications

  • Industrial and automotive power supplies
  • Battery-powered instruments and handheld devices
  • Distributed power systems and intermediate buses
  • Solar-powered systems and energy harvesting
  • High-power LED drivers
  • Single-/multi-cell battery to 3.3V/5V/12V conversion

The LTC3112EFE is a high-performance synchronous buck-boost DC-DC converter from Analog Devices, designed for applications where the input voltage can be above, below, or equal to the output voltage. This makes it ideal for battery-powered systems where the battery discharge curve crosses the desired output voltage, such as a single Li-ion cell (2.7V-4.2V) powering a 3.3V system, or a 12V automotive supply (9V-16V) regulating a 12V output.

The LTC3112 uses a four-switch (two high-side, two low-side) synchronous buck-boost topology that provides seamless transitions between buck mode (VIN > VOUT), boost mode (VIN < VOUT), and buck-boost mode (VIN ≈ VOUT). Unlike SEPIC or flyback topologies, the four-switch buck-boost uses a single inductor and provides high efficiency across all operating modes. Synchronous rectification (both high-side and low-side switches are MOSFETs, not diodes) delivers high efficiency up to 95%. For light-load efficiency, Burst Mode operation reduces quiescent current to just 35µA, significantly extending battery life in always-on systems. The switching frequency is programmable from 100kHz to 2MHz via a single resistor, allowing optimization between component size and efficiency. Additional features include programmable soft-start to limit inrush current, output disconnect during shutdown (prevents battery drain through the output), and comprehensive protection including thermal shutdown, overcurrent protection, and short-circuit protection. The TSSOP-20 package with exposed pad provides good thermal dissipation for reliable operation at high power levels.

The LTC3112 is a four-switch synchronous buck-boost converter operating as follows:

1. Four-Switch Topology: The converter uses four MOSFETs: two high-side (A and B) and two low-side (C and D), arranged around a single inductor. Switch A connects VIN to the inductor, switch D connects the inductor to ground (input side). Switch B connects VOUT to the inductor, switch C connects the inductor to ground (output side). This allows operation in buck, boost, and buck-boost modes.

2. Buck Mode (VIN > VOUT): In buck mode, switches B and C form the buck pair on the output side. Switch A is always on, switch D is always off. B and C switch alternately like a standard buck converter, stepping down the voltage.

3. Boost Mode (VIN < VOUT): In boost mode, switches A and D form the boost pair on the input side. Switch B is always on, switch C is always off. A and D switch alternately like a standard boost converter, stepping up the voltage. 4. Buck-Boost Mode (VIN ≈ VOUT): When input and output voltages are close, all four switches operate in a combined sequence that maintains regulation through the transition region. This ensures seamless mode transitions without glitches or excessive output ripple. 5. Control Architecture: The LTC3112 uses current-mode control with an inner current loop and outer voltage loop. The error amplifier compares the feedback voltage against a 0.8V reference and sets the peak inductor current. This provides good line and load regulation plus inherent cycle-by-cycle current limiting. 6. Burst Mode Operation: At light loads, the converter enters Burst Mode. It delivers short bursts of current to the output, then shuts down most of the control circuitry for extended periods. This reduces the average quiescent current to 35µA, maximizing efficiency at low output currents. 7. Protection Features: Cycle-by-cycle current limit on both switches, output overvoltage protection, thermal shutdown, and output disconnect (prevents reverse current when shut down).

Pin Name Type Description
1 SW1 I/O Switch node 1 (input side). Connect to one end of inductor and drain of switch A / source of switch D.
2 VIN Power Input Input voltage supply (2.7V to 40V). Bypass with ceramic capacitors to GND.
3 VIN Power Input Second VIN pin. Connected internally. Both pins must be connected together.
4 RUN Input Run / enable input. Drive above 1.2V to enable. Pull below 0.5V to shut down.
5 FB Input Feedback input. Connect resistor divider from VOUT to FB to GND. Regulation point = 0.8V.
6 ISET Input Current limit programming. Resistor to GND sets peak switch current limit.
7 RT Input Oscillator frequency programming. Resistor to GND sets switching frequency (100kHz to 2MHz).
8 SS I/O Soft-start pin. Connect capacitor to GND to program soft-start time. Limits inrush current during start-up.
9 SYNC/MODE Input Synchronization / mode select. External clock input for sync, or tie to GND/VCC for Burst Mode/pulse-skipping selection.
10 GND Ground Signal ground. Connect to ground plane.
11 PG Output Power-good open-drain output. Flags when VOUT is within regulation. Requires external pull-up.
12 CLKOUT Output Clock output. 180° out-of-phase clock for driving additional converters in multiphase designs.
13 GND Ground Power ground. Return path for high-current switching.
14 GND Ground Second power ground pin.
15 VOUT Output Output voltage sense. Connect to VOUT rail for output voltage sensing.
16 VOUT Output Output power. Connect to output capacitors and load.
17 SW2 I/O Switch node 2 (output side). Connect to other end of inductor and drain of switch B / source of switch C.
18 SW2 I/O Second SW2 pin. Connected internally. Both pins connected together externally.
19 GND Ground Additional power ground pin.
20 GND Ground Additional power ground pin.
Pad EP Thermal Exposed pad. Solder to ground plane with multiple vias for thermal dissipation.
  • Battery-powered instruments (Li-ion to 3.3V / 5V)
  • Automotive 12V systems with cold-crank and load-dump conditions
  • Industrial 24V to 12V/5V/3.3V power supplies
  • Solar-powered sensor nodes and energy harvesting
  • High-power LED drivers with wide input voltage range
  • Distributed power architectures with variable input
Manufacturer Part Number Package Notes
Analog Devices LTC3115-1 DFN-12 2A 2.7V-40V buck-boost
Analog Devices LTC3780 SSOP-28 Controller version (external FETs, higher power)
Analog Devices LTC3533 DFN 2.4V-15V, 200mA lower power
Texas Instruments LM5175 QFN-28 4-switch buck-boost controller
Texas Instruments TPS63070 QFN-15 2A 2V-16V buck-boost
MPS MP8869 QFN 3A buck-boost alternative
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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:
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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.

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Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China

 

Shipping & Payment

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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.

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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.

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Contact Information

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Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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