Analog Devices Inc. LTC3624IMSE-25#TRPBF

Overview

LTC3624IMSE-25#TRPBF from Analog Devices (formerly Linear Technology) is a 2.25MHz, 2A synchronous step-down DC/DC regulator with fixed 5V output, operating from 2.7V to 17V input and delivering ±1% output voltage accuracy with only 3.5µA quiescent current in Burst Mode. It integrates PMOS/NMOS power switches, internal compensation, soft-start, and overtemperature protection in a compact 12-lead MSOP package - ideal for space-constrained battery-powered instrumentation requiring high light-load efficiency.

For engineers reviewing the LTC3624IMSE-25#TRPBF datasheet, LTC3624IMSE-25#TRPBF pinout, LTC3624IMSE-25#TRPBF application, or LTC3624IMSE-25#TRPBF equivalent, key selection criteria include its 2.25MHz switching frequency for small external components, fixed 5V output eliminating feedback resistor network, ultralow 3.5µA IQ in shutdown, and support for pulse-skipping, forced continuous, and Burst Mode® operation to balance ripple vs. efficiency.

Technical Context

The LTC3624IMSE-25#TRPBF employs a constant-frequency peak current mode control architecture with internal slope compensation, enabling stable regulation across wide input (2.7V–17V) and load (0–2A) ranges. Its 2.25MHz switching frequency allows use of sub-3.3µH inductors and low-ESR ceramic capacitors while maintaining tight transient response.

It features three selectable operating modes via the MODE/SYNC pin: Burst Mode® (for <3.5µA IQ), pulse-skipping (for lowest VOUT ripple), and forced continuous (for EMI-sensitive applications). The device includes integrated 0.6V reference, ±7.5% PGOOD window, 1ms internal soft-start, and VIN overvoltage lockout at 19V.

Key Specifications

Pinout & Package

Package: 12-lead plastic MSOP (3mm × 4.4mm) with exposed thermal pad (Pin 13 = GND). Requires soldering of exposed pad to PCB ground plane for rated θ_JA = 40°C/W and thermal reliability.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down regulator applications.

Compared with TPS62840DLCR and MP2143GJ-Z, the LTC3624IMSE-25#TRPBF uniquely combines 2.7V–17V input range, 3.5µA Burst Mode IQ, integrated PGOOD, and 19V overvoltage protection - making it optimal for mixed-source (battery + adapter) portable equipment requiring long runtime and robustness.

Availability

LTC3624IMSE-25#TRPBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, emergency radios, and industrial handheld terminals requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to 125°C.

Supply support for LTC3624IMSE-25#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, industrial, automotive, and communications markets.

The LTC3624 product line delivers ultralow-quiescent-current monolithic buck regulators for battery-critical applications - designed specifically to extend runtime in portable medical, test equipment, and emergency-response devices without compromising regulation accuracy or transient response.

FAQ

What is the maximum input voltage rating for the LTC3624IMSE-25#TRPBF?

The LTC3624IMSE-25#TRPBF has an absolute maximum input voltage rating of 17V. It also incorporates VIN overvoltage protection that suspends operation when VIN exceeds 19V and resumes normal regulation once VIN falls below 18.5V. This dual-level protection safeguards the internal PMOS/NMOS switches during transient events, ensuring reliable operation in environments with unstable or shared power sources.

Does the LTC3624IMSE-25#TRPBF require external feedback resistors to set the output voltage?

No, the LTC3624IMSE-25#TRPBF does not require external feedback resistors. As a fixed 5V output variant, the FB pin is internally connected to the regulated 5V output. This eliminates resistor tolerance errors, temperature drift, and layout sensitivity - simplifying design and improving long-term output accuracy to ±1% over temperature and line/load conditions.

How does the MODE/SYNC pin function on the LTC3624IMSE-25#TRPBF?

The MODE/SYNC pin on the LTC3624IMSE-25#TRPBF selects operating mode: tie to INTVCC for Burst Mode® (3.5µA IQ), ground for pulse-skipping (lowest ripple), or apply an external clock (2.05–2.6MHz) for synchronization. In all cases, the pin also enables forced continuous mode when biased between 1V and V_INTVCC–1.2V - giving designers full control over the trade-off between efficiency, noise, and EMI.

What thermal considerations apply to the LTC3624IMSE-25#TRPBF in a 12-lead MSOP package?

The LTC3624IMSE-25#TRPBF in the 12-lead MSOP package has θ_JA = 40°C/W and requires soldering of the exposed thermal pad (Pin 13) to a minimum 100mm² PCB copper area for rated performance. Without proper pad connection, junction temperature can exceed 150°C under 2A load at elevated ambient - triggering thermal shutdown. Layout must prioritize low-thermal-resistance GND plane connection and avoid isolation cuts beneath the pad.

Is the LTC3624IMSE-25#TRPBF RoHS-compliant and lead-free?

Yes, the LTC3624IMSE-25#TRPBF is RoHS-compliant and features a lead-free finish. The "#TRPBF" suffix explicitly denotes tape-and-reel packaging with lead-free (Pb-free) termination. It meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) and is compatible with standard SnPb and lead-free reflow profiles per Analog Devices' packaging specifications.