Analog Devices Inc. LTC3112IFE#TRPBF

Overview

LTC3112IFE#TRPBF from Analog Devices (formerly Linear Technology) is a fixed-frequency synchronous buck-boost DC/DC converter with 4-switch single-inductor architecture, supporting input voltages from 2.7V to 15V and regulated output from 2.5V to 14V. It delivers up to 2.5A continuous output current at 5VOUT in PWM mode with VIN ≥ 5V, features internal N-channel MOSFETs (R_DS(ON) = 40–60 mΩ), and enables seamless regulation when VIN is above, below, or equal to VOUT - ideal for multi-cell Li-ion, backup capacitor, or wide-input industrial power rails.

For engineers reviewing the LTC3112IFE#TRPBF datasheet, LTC3112IFE#TRPBF pinout, LTC3112IFE#TRPBF application, or LTC3112IFE#TRPBF equivalent, key selection criteria include its 750kHz synchronizable switching frequency, selectable Burst Mode® (I_Q = 50 µA) or PWM operation, output disconnect in shutdown, integrated current monitor (24 µA/A), and thermal protection across –40°C to 125°C junction range.

Technical Context

The LTC3112IFE#TRPBF implements a proprietary voltage-mode control algorithm with a high-gain error amplifier and COMP-compensated feedback loop, enabling stable regulation across buck, buck-boost, and boost topologies without inductor current discontinuity. Its dual floating gate drivers (BST1/BST2) support efficient 4-switch operation using external 0.1µF bootstrap capacitors per switch pair.

It integrates independent UVLO circuits for VIN (2.3V rising) and VCC (2.35V rising), overvoltage protection (OVP threshold = 0.83V at pin), reverse current limiting (–1A typical), and thermal shutdown activation at ~170°C with auto-restart at ~160°C - all coordinated within a single monolithic IC requiring only one external inductor and minimal passive components.

Key Specifications

Pinout & Package

The LTC3112IFE#TRPBF is housed in a thermally enhanced 20-lead plastic TSSOP package (5mm × 6.5mm × 1.1mm) with exposed GND pad (Pin 21) requiring PCB soldering for optimal thermal performance (θ_JA = 38°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar buck-boost regulator applications.

Compared with LT8390AEMSE#TRPBF and TPS63020DSJR, the LTC3112IFE#TRPBF uniquely balances wide 2.7–15V input, integrated MOSFETs, analog current monitoring, and OVP programmability in a thermally optimized TSSOP - making it optimal for mid-power industrial and portable systems demanding flexibility and reliability without external FETs.

Availability

LTC3112IFE#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, RF power amplifier bias supplies, industrial handheld terminals, and automotive interior LED lighting requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC3112IFE#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, communications, and industrial markets.

The LTC3112 product line was designed specifically for high-efficiency, wide-input-range DC/DC conversion in battery-backed, multi-rail, and transient-tolerant systems - emphasizing seamless buck-boost operation, integrated protection, and minimal external component count.

FAQ

What is the maximum continuous output current capability of the LTC3112IFE#TRPBF?

The LTC3112IFE#TRPBF delivers up to 2.5A continuous output current at 5VOUT when VIN ≥ 5V and operating in PWM mode. This rating assumes proper thermal management using the exposed GND pad and a 4-layer PCB with adequate copper area. At lower input voltages (e.g., VIN = 2.7V), output current is reduced due to increased conduction losses and thermal limits - refer to Figure G04 in the datasheet for derating curves.

Does the LTC3112IFE#TRPBF support output voltage adjustment, and what is the range?

Yes, the LTC3112IFE#TRPBF supports fully adjustable output voltage from 2.5V to 14V using a resistor divider connected to the FB pin. The internal 0.8V reference enables precise setting via VOUT = 0.8V × (1 + R1/R2), where R1 connects between VOUT and FB, and R2 connects between FB and GND. This flexibility allows single-design reuse across multiple output requirements without changing the IC.

How does the IOUT pin on the LTC3112IFE#TRPBF function, and what is its accuracy?

The IOUT pin on the LTC3112IFE#TRPBF sources a current of 24µA per ampere of SW2-to-VOUT output current, enabling direct analog current monitoring or closed-loop current regulation. At 1.5A load, it delivers 36µA ±4µA (typical); accuracy degrades slightly at temperature extremes and light loads. An RC filter (e.g., 42.2kΩ + 100pF) converts this to a measurable voltage - 1V per ampere - for ADC interfacing or comparator-based current limiting.

Can the LTC3112IFE#TRPBF be synchronized to an external clock, and what is the supported frequency range?

Yes, the LTC3112IFE#TRPBF can be synchronized to an external clock applied to the PWM/SYNC pin. It accepts a square-wave signal from 300kHz to 1.5MHz with minimum high/low times of 100ns. This feature allows EMI reduction through frequency spreading or alignment with system clocks - critical in noise-sensitive applications like medical sensors or RF modules - without requiring additional timing components.

What thermal considerations apply to the LTC3112IFE#TRPBF in a 20-lead TSSOP package?

The LTC3112IFE#TRPBF in 20-lead TSSOP relies on its exposed GND pad (Pin 21) for thermal dissipation. To maintain junction temperature below 150°C, the pad must be soldered to a large internal or external copper plane using ≥4 thermal vias (0.3mm diameter). Thermal resistance is θ_JA = 38°C/W on a 4-layer demo board; inadequate copper area or poor via design will cause premature thermal shutdown and current derating - especially at high input/output differentials.