Analog Devices Inc. LTC3112IDHD#PBF

Overview

LTC3112IDHD#PBF 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 integrated 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 LTC3112IDHD#PBF datasheet, LTC3112IDHD#PBF pinout, LTC3112IDHD#PBF application, or LTC3112IDHD#PBF equivalent, key selection criteria include its 750kHz synchronizable switching frequency, output current monitor (24µA/A), <1µA shutdown current, and thermal performance in the 16-lead 4mm × 5mm DFN package with exposed GND pad.

Technical Context

The LTC3112IDHD#PBF implements a proprietary voltage-mode control algorithm with dual current-limit protection: an average current limit (6A typical) enforced via feedback injection and a fast peak current limit (~10A) for hard short-circuit response. Its 4-switch topology dynamically selects buck, boost, or buck-boost conduction paths without inductor current discontinuity, enabling low-noise operation across input-output crossover.

Internal circuitry includes a 750kHz PLL-based oscillator with 300kHz–1.5MHz synchronization capability, a 0.8V reference with ±2.5% FB accuracy over temperature, and independent UVLO thresholds for VIN (2.3V rising) and VCC (2.35V rising). Thermal shutdown activates at ~170°C with automatic restart at ~160°C, and output disconnect is enforced during shutdown.

Key Specifications

Pinout & Package

Package: 16-lead (4mm × 5mm × 0.75mm) plastic DFN with exposed GND pad (Pin 17), rated for –40°C to +125°C junction temperature. Exposed pad must be soldered to PCB ground plane with multiple thermal vias for effective heat dissipation (θ_JA = 43°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT8390AEDD#PBF and TPS63020DSJR, the LTC3112IDHD#PBF uniquely balances 2.5A output, integrated MOSFETs, analog current monitoring, and comprehensive protection in a thermally optimized 4mm × 5mm DFN - making it the optimal choice for mid-power battery-backed industrial and RF systems demanding both performance and simplicity.

Availability

LTC3112IDHD#PBF is available at Aetrix Electronics and suitable for handheld inventory terminals, RF transmitter power supplies, LED lighting with current regulation, and multiple power input systems requiring stable component supply across extended temperature ranges.

Supply support for LTC3112IDHD#PBF 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 industrial, automotive, communications, and healthcare markets.

The LTC3112 product line was designed specifically for wide-input, high-current buck-boost conversion in battery-powered and multi-rail industrial equipment - emphasizing seamless VIN/VOUT crossover, integrated protection, and thermal robustness in compact packages.

FAQ

What is the maximum continuous output current of the LTC3112IDHD#PBF?

The LTC3112IDHD#PBF 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 per the demo board layout. At higher ambient temperatures or with reduced copper area, derating applies per the die temperature rise curves in the datasheet.

Does the LTC3112IDHD#PBF support output voltage adjustment?

Yes, the LTC3112IDHD#PBF supports adjustable output voltage from 2.5V to 14V using a resistor divider on the FB pin. The formula is VOUT = 0.8V × (1 + R1/R2), where R1 connects between VOUT and FB, and R2 connects between FB and GND. The FB reference voltage is trimmed to ±2.5% over temperature, ensuring stable regulation across operating conditions.

How does the IOUT pin function on the LTC3112IDHD#PBF?

The IOUT pin on the LTC3112IDHD#PBF sources a precise 24µA per ampere of SW2-to-VOUT output current, enabling analog current monitoring or closed-loop current limiting. When paired with an RC network (e.g., 42.2kΩ + 100pF), it generates a voltage proportional to load current - allowing real-time measurement or active regulation without a discrete sense resistor or amplifier.

What thermal considerations apply to the LTC3112IDHD#PBF in high-current operation?

The LTC3112IDHD#PBF requires soldering of its exposed GND pad (Pin 17) to a PCB ground plane with ≥6 thermal vias to maintain safe junction temperature. Under 2.5A load at 5VOUT, die temperature rise is ~40°C above ambient on a 4-layer demo board. Continuous operation above 125°C junction degrades lifetime; thermal shutdown activates at ~170°C with automatic restart at ~160°C.

Can the LTC3112IDHD#PBF synchronize to an external clock?

Yes, the LTC3112IDHD#PBF can synchronize to an external clock applied to the PWM/SYNC pin across 300kHz to 1.5MHz. The input must be a square wave with minimum high/low times ≥100ns. This feature allows EMI reduction by shifting switching noise away from sensitive frequency bands or aligning multiple converters for interleaved operation.