Analog Devices Inc. LTC3626EUDC#TRPBF

Overview

LTC3626EUDC#TRPBF from Analog Devices (formerly Linear Technology) is a 20V, 2.5A monolithic synchronous step-down regulator with current mode control, integrated power MOSFETs, and real-time input/output current + die temperature monitoring. It operates from 3.6V to 20V input, delivers 0.6V–6V output, achieves up to 95% efficiency, and supports programmable 500kHz–3MHz switching frequency - ideal for point-of-load regulation in space-constrained industrial and battery-powered systems.

For engineers reviewing the LTC3626EUDC#TRPBF datasheet, LTC3626EUDC#TRPBF pinout, LTC3626EUDC#TRPBF application, or LTC3626EUDC#TRPBF equivalent, key selection criteria include its controlled on-time architecture for fast transient response, dual-mode operation (Burst Mode® vs forced continuous), ±1% reference accuracy over temperature, and integrated current/temperature limit functions requiring no external sense resistors.

Technical Context

The LTC3626EUDC#TRPBF implements a phase-lockable controlled on-time current mode architecture: an internal one-shot timer sets top-FET conduction time based on VON voltage, while valley current sensing via bottom-FET R_DS(ON) determines off-time. An internal PLL aligns switching edges to either the internal oscillator (set by RT resistor) or an external clock applied to MODE/SYNC.

It integrates two independent current-monitoring paths - IMONIN and IMONOUT - each delivering a 1/16,000-scaled replica of average input or output current, referenced to a 1.22V threshold for programmable limiting. Die temperature is monitored via TMON (200 mV/°C scaling) against a user-set TSET voltage, triggering shutdown at configurable junction temperature with 10°C hysteresis.

Key Specifications

Pinout & Package

Package: 20-lead (3mm × 4mm) plastic QFN with exposed PGND pad (Pin 21), rated for –40°C to 125°C operating junction temperature. Exposed pad must be soldered to PCB for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2451DT-LF-Z and TPS54202DRCT, the LTC3626EUDC#TRPBF uniquely integrates precision current monitoring (no sense resistors), die temperature telemetry (TMON), and programmable thermal shutdown (TSET) - making it optimal for applications demanding reliability, telemetry, and compact high-current PoL design.

Availability

LTC3626EUDC#TRPBF is available at Aetrix Electronics and suitable for industrial PLCs, portable test equipment, medical imaging sensors, and automotive ADAS camera modules requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for LTC3626EUDC#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 industrial, automotive, communications, and healthcare markets.

The LTC3626EUDC#TRPBF belongs to Linear's high-efficiency monolithic DC/DC regulator product line, designed specifically for demanding point-of-load applications requiring integrated current/temperature monitoring, fast transient response, and robust protection in compact QFN packages.

FAQ

What is the maximum supported output voltage for stable operation of the LTC3626EUDC#TRPBF?

The LTC3626EUDC#TRPBF is optimized for output voltages from 0.6V to 6V. While the datasheet states a theoretical range up to 97% of VIN, operation above 6V compromises the controlled on-time architecture's frequency stability and is not recommended for production designs. For outputs >6V, alternative regulators with voltage-mode control should be considered. The LTC3626EUDC#TRPBF's VON pin configuration and internal timing constraints are validated only up to 6V.

How does the LTC3626EUDC#TRPBF implement current limiting without external sense resistors?

The LTC3626EUDC#TRPBF uses internal MOSFET R_DS(ON) sensing to generate scaled current monitor outputs: IMONIN delivers 1/16,000× average input current, and IMONOUT delivers 1/16,000× average output current. Each pin connects to SGND via a resistor; when the resulting voltage reaches 1.22V (typical), the error amplifier throttles duty cycle to enforce the limit. This eliminates power loss and board space associated with external shunts. The LTC3626EUDC#TRPBF's architecture inherently avoids sense resistor inaccuracies and thermal drift.

Can the LTC3626EUDC#TRPBF be synchronized to an external clock, and what happens to its operating mode?

Yes - applying a clean square wave to the MODE/SYNC pin synchronizes the LTC3626EUDC#TRPBF's internal PLL to that clock across 500kHz–3MHz. During synchronization, the LTC3626EUDC#TRPBF defaults to forced continuous mode regardless of MODE/SYNC pin DC bias. This ensures deterministic switching edges for EMI reduction but disables Burst Mode® operation. The external clock must meet specified VIH/VIL thresholds (≥1.4V/≤0.4V) and have low jitter to maintain lock stability.

What thermal protection mechanisms does the LTC3626EUDC#TRPBF provide, and how are they configured?

The LTC3626EUDC#TRPBF provides two-tier thermal protection: (1) User-configurable shutdown via TSET/TMON - set TSET voltage to trigger shutdown at desired junction temperature (e.g., 1.7V = 100°C); (2) Internal secondary overtemperature shutdown at ~150°C (per Note 4). TMON outputs 200 mV/°C for telemetry. Both features are active simultaneously. The LTC3626EUDC#TRPBF resumes operation automatically once die temperature falls 10°C below the TSET threshold, enabling self-recovery in intermittent overload conditions.

Is the LTC3626EUDC#TRPBF pin-compatible with other members of the LTC362x family?

No - the LTC3626EUDC#TRPBF is not pin-compatible with LTC3621, LTC3622, or LTC3624. Although all share the 20-lead QFN package, pin assignments differ significantly: for example, LTC3621 places RUN on Pin 13 but uses Pin 17 for SYNC-only (no MODE function), and LTC3624 lacks TSET/TMON pins entirely. Layout reuse is not possible. The LTC3626EUDC#TRPBF's unique feature set - including dual current monitors and die temperature interface - mandates dedicated PCB design.