Analog Devices Inc. LTC3624EDD-2#TRPBF

Overview

LTC3624EDD-2#TRPBF from Analog Devices (formerly Linear Technology) is a 17V, 2A synchronous step-down regulator in an 8-lead 3mm × 3mm DFN package, operating at a fixed 2.25MHz switching frequency with ±40% synchronization range, 3.5µA quiescent current in Burst Mode, and adjustable 0.6V to VIN output voltage - deployed in portable instrumentation and emergency radios requiring high light-load efficiency and compact power conversion.

For engineers reviewing the LTC3624EDD-2#TRPBF datasheet, LTC3624EDD-2#TRPBF pinout, LTC3624EDD-2#TRPBF application, or LTC3624EDD-2#TRPBF equivalent, key selection criteria include its 2.25MHz fixed-frequency operation, ultralow 3.5µA IQ in shutdown, ±1% output voltage accuracy over temperature, 100% duty-cycle dropout capability, and MODE/SYNC pin configurability for Burst Mode, pulse-skipping, or forced continuous operation.

Technical Context

The LTC3624EDD-2#TRPBF employs a constant-frequency peak current mode control architecture with internal compensation, enabling stable regulation across 2.7V–17V input and 0.6V–VIN output ranges. Its 2.25MHz oscillator supports external synchronization within ±40% of nominal frequency and features programmable operation modes via the MODE/SYNC pin.

It integrates dual MOSFETs (115mΩ NMOS, 200mΩ PMOS at VIN = 5V), delivers up to 2A output current, and includes overtemperature protection, PGOOD monitoring with ±7.5% window and 32-cycle delay, and 1ms internal soft-start. The device maintains ±1% VFB accuracy (0.591V–0.609V) and supports 100% duty cycle for low-dropout operation.

Key Specifications

Pinout & Package

Package: 8-Lead (3mm × 3mm) Plastic DFN with exposed thermal pad (Pin 9 = GND). Requires soldering of exposed pad to PCB ground for rated thermal performance (θJA = 43°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS62840DRVR and MP2144GJ-Z, the LTC3624EDD-2#TRPBF uniquely balances 2.25MHz operation, 17V input tolerance, 3.5µA IQ, and full MODE/SYNC configurability - making it optimal for wide-input, battery-critical, space-constrained applications where both efficiency and flexibility matter.

Availability

LTC3624EDD-2#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, emergency radios, and low-power industrial controllers requiring stable component supply, long-lifecycle assurance, and guaranteed parametric compliance.

Supply support for LTC3624EDD-2#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 acquired Linear Technology in 2017 and maintains its high-performance power management portfolio with rigorous qualification and long-term product support.

The LTC3624EDD-2#TRPBF belongs to the LTC® monolithic synchronous buck regulator family, designed specifically for high-efficiency, low-quiescent-current power conversion in battery-powered and space-constrained embedded systems.

FAQ

What is the switching frequency of the LTC3624EDD-2#TRPBF and can it be synchronized?

The LTC3624EDD-2#TRPBF operates at a fixed 2.25MHz switching frequency. It supports external synchronization via the MODE/SYNC pin across a ±40% range (1.35MHz to 3.15MHz). Synchronization engages within 2–3 external clock cycles and disengages after ~2µs of missing clock edges. This capability allows noise-sensitive systems to avoid interference bands while maintaining tight regulation.

How does the MODE/SYNC pin configure operating modes on the LTC3624EDD-2#TRPBF?

The MODE/SYNC pin configures three distinct operating modes on the LTC3624EDD-2#TRPBF: tie to INTVCC for Burst Mode (3.5µA IQ, 800mA peak clamp), tie to GND for pulse-skipping (lowest output ripple), or apply 1.0V–2.4V for forced continuous mode (fixed 2.25MHz, zero-load capable). Each mode directly affects light-load efficiency, output ripple, and transient response - enabling application-specific optimization without external components.

What is the minimum input voltage and dropout behavior of the LTC3624EDD-2#TRPBF?

The LTC3624EDD-2#TRPBF operates down to 2.7V input and supports 100% duty cycle operation, enabling regulation even when VIN approaches VOUT - critical for battery discharge scenarios. In dropout, the top PMOS switch remains fully on, sustaining output voltage with minimal headroom. This behavior is maintained across all MODE/SYNC configurations, though Burst Mode and pulse-skipping will cycle into sleep states to preserve ultralow IQ during light loads.

Does the LTC3624EDD-2#TRPBF require external compensation components?

No, the LTC3624EDD-2#TRPBF features fully internal compensation - no external RC networks or type-II/type-III compensators are needed. Its current-mode architecture with integrated slope compensation provides inherent stability across the full 0.6V–VIN output range and 2.7V–17V input range. This simplifies design, reduces bill-of-materials cost, and eliminates tuning effort while ensuring robust transient response and loop stability.

What thermal considerations apply to the LTC3624EDD-2#TRPBF in its DFN package?

The LTC3624EDD-2#TRPBF uses an 8-lead 3mm × 3mm DFN with exposed thermal pad (Pin 9 = GND). For rated thermal performance (θJA = 43°C/W), the exposed pad must be soldered to a minimum 100mm² copper pour on the PCB. Insufficient thermal relief increases junction temperature, potentially triggering overtemperature protection at >125°C. Layout best practices include multiple thermal vias under the pad and minimizing trace resistance between GND pins and the main ground plane.