Analog Devices Inc. LTC3814EFE-5#TRPBF

Overview

LTC3814EFE-5#TRPBF from Analog Devices (formerly Linear Technology) is a 60V synchronous step-up DC/DC controller IC using constant off-time peak current mode control to deliver high-duty-cycle boost conversion without a current sense resistor. It features ±0.5% reference accuracy, 25MHz error amplifier bandwidth, 1Ω gate drivers, and programmable soft-start. It is used in 24V fan supplies and 48V telecom power systems.

For engineers reviewing the LTC3814EFE-5#TRPBF datasheet, LTC3814EFE-5#TRPBF pinout, LTC3814EFE-5#TRPBF application, or LTC3814EFE-5#TRPBF equivalent, key selection criteria include its 60V output capability, no-R_SENSE architecture, dual N-channel MOSFET drive, adjustable off-time via IOFF/VOFF, and thermal performance in the 16-pin TSSOP package with exposed pad.

Technical Context

The LTC3814EFE-5#TRPBF implements a constant off-time (COT) current-mode control architecture where top MOSFET on-time is set by IOFF current and VOFF voltage, enabling stable operation at very high duty cycles. Its cycle-by-cycle current limit is adjusted via VRNG pin (0.5V–2V), setting nominal sense thresholds from 60mV to 320mV without external sensing.

It integrates dual 1Ω gate drivers (TG and BG), supports floating BOOST supply generation via external diode and capacitor, and provides independent INTVCC regulation from EXTVCC or NDRV-controlled external NMOS. Protection includes PGOOD with ±10% output window, INTVCC UVLO (4.2V), and output overvoltage shutdown.

Key Specifications

Pinout & Package

Package: 16-lead plastic TSSOP with exposed GND pad (Pin 17), thermally enhanced for high-power density applications. Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous step-up controller applications.

Compared with LTC3780EFE#TRPBF and LM5122MMX/NOPB, the LTC3814EFE-5#TRPBF offers superior reference accuracy (±0.5%), no-R_SENSE operation, and tighter thermal specs in the same TSSOP package - making it the optimal choice for high-precision, high-voltage boost applications where output stability and component count matter.

Availability

LTC3814EFE-5#TRPBF is available at Aetrix Electronics and suitable for 24V fan supplies, 48V telecom power supplies, and industrial control system rails requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LTC3814EFE-5#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.

The LTC3814EFE-5#TRPBF belongs to Linear's high-voltage synchronous controller product line, designed specifically for efficient, high-reliability boost conversion in telecom, industrial, and networking infrastructure where precision, thermal robustness, and no-R_SENSE operation are critical.

FAQ

What is the maximum output voltage supported by the LTC3814EFE-5#TRPBF?

The LTC3814EFE-5#TRPBF supports output voltages up to 60V, as specified in its absolute maximum ratings and confirmed in the Typical Application schematic and Efficiency vs Load Current curves. This limit is enforced by internal protection circuits and validated across the full –40°C to 125°C operating junction temperature range.

Does the LTC3814EFE-5#TRPBF require an external current sense resistor?

No, the LTC3814EFE-5#TRPBF does not require an external current sense resistor. It uses the R_DS(ON) of the bottom N-channel MOSFET for current sensing, with the VRNG pin configuring the nominal sense voltage threshold between 60mV and 320mV - a core feature documented in the Applications Information section.

What package type and thermal characteristics does the LTC3814EFE-5#TRPBF have?

The LTC3814EFE-5#TRPBF is housed in a 16-lead plastic TSSOP with exposed GND pad (Pin 17). Its thermal resistance is θ_JA = 38°C/W when the exposed pad is properly soldered to PCB ground, enabling continuous operation at 125°C junction temperature - verified in the Absolute Maximum Ratings and Package/Order Information tables.

How is the switching frequency programmed on the LTC3814EFE-5#TRPBF?

The switching frequency of the LTC3814EFE-5#TRPBF is programmed indirectly via the IOFF and VOFF pins. A resistor from VOUT to IOFF sets the one-shot timer current, while VOFF (tied to a VIN divider) sets the comparator trip point. The resulting off-time is t_OFF = V_VOFF/I_IOFF × 76pF - detailed in the Electrical Characteristics and Operation sections.

What protection features are integrated into the LTC3814EFE-5#TRPBF?

The LTC3814EFE-5#TRPBF integrates PGOOD output with ±10% output voltage window and 125μs delay, INTVCC undervoltage lockout (4.2V threshold), output overvoltage shutdown, and cycle-by-cycle current limiting via the VRNG-configurable sense threshold - all explicitly listed in the Features and Fault Monitoring/Protection sections.