Analog Devices Inc. LTC3416EFE#TRPBF

Overview

LTC3416EFE#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC regulator delivering up to 4A output current with 67mΩ P-channel and 50mΩ N-channel internal MOSFETs, programmable 300kHz–4MHz switching frequency via external resistor, ±2% output voltage accuracy over 0.8V–5V range, and tracking capability for supply sequencing in multi-rail systems.

For engineers reviewing the LTC3416EFE#TRPBF datasheet, LTC3416EFE#TRPBF pinout, LTC3416EFE#TRPBF application, or LTC3416EFE#TRPBF equivalent, key selection considerations include its forced continuous conduction mode for low-noise operation, OPTI-LOOP® compensation for transient optimization across load/capacitor variations, 100% duty cycle low-dropout capability, power-good monitoring, and thermal protection - all in a 20-lead thermally enhanced TSSOP package with exposed ground pad.

Technical Context

The LTC3416EFE#TRPBF employs a constant-frequency current-mode architecture with integrated P-channel and N-channel synchronous power switches. Its peak-current limit is adjustable via the ITH pin (0.2V–1.4V control range), and slope compensation recovery maintains consistent maximum inductor peak current across duty cycles >40%.

Voltage tracking is implemented through the TRACK pin (0–0.8V range), enabling precise start-up sequencing between core and I/O rails; tracking control is gradually released as TRACK exceeds 0.8V and fully disabled above 1.05V. The device operates in forced continuous mode to suppress subharmonic oscillation and minimize EMI, with undervoltage lockout at 1.75V–2.25V and overtemperature shutdown at ~150°C junction temperature.

Key Specifications

Pinout & Package

Package: 20-lead thermally enhanced TSSOP with exposed ground pad (Pin 21), θ_JA = 38°C/W. Exposed pad must be soldered to PCB ground plane for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2451DT-LF-Z and TPS54332DDAR, the LTC3416EFE#TRPBF uniquely integrates precision tracking, 4A capability, and ultra-low 2.25V minimum input - making it optimal for compact, multi-rail battery-operated devices where sequencing integrity and dropout performance are critical.

Availability

LTC3416EFE#TRPBF is available at Aetrix Electronics and suitable for portable instruments, notebook computers, distributed power systems, and battery-powered equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for LTC3416EFE#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 continues to develop high-performance power management ICs with emphasis on efficiency, integration, and reliability for demanding analog and mixed-signal applications.

The LTC3416EFE#TRPBF belongs to Linear's monolithic synchronous buck regulator product line, designed specifically for high-current, low-voltage point-of-load conversion in space-constrained, battery-sensitive systems requiring precise supply sequencing and robust thermal performance.

FAQ

What is the minimum input voltage supported by the LTC3416EFE#TRPBF?

The LTC3416EFE#TRPBF supports a minimum input voltage of 2.25V, enabling direct operation from partially discharged single-cell Li-ion batteries or low-voltage intermediate rails. This specification is guaranteed over the full –40°C to 85°C operating temperature range and allows the device to maintain regulation in dropout mode down to input voltages within ~100mV of the output voltage.

How does the TRACK pin function in the LTC3416EFE#TRPBF?

The TRACK pin on the LTC3416EFE#TRPBF accepts a 0–0.8V analog voltage to enable output voltage ramp tracking of another power rail. When the TRACK voltage is below 0.8V, the feedback loop regulates V_FB to match that voltage, allowing ratiometric or coincident sequencing. Tracking control is gradually released as TRACK rises above 0.8V and fully disabled above 1.05V - a feature confirmed in the LTC3416EFE#TRPBF datasheet Figure 3 and Functional Description section.

What package type and thermal characteristics does the LTC3416EFE#TRPBF use?

The LTC3416EFE#TRPBF uses a 20-lead thermally enhanced TSSOP package with an exposed ground pad (Pin 21). Its thermal resistance is θ_JA = 38°C/W and θ_JC = 10°C/W. The exposed pad must be soldered to a PCB ground plane to achieve rated performance and prevent thermal shutdown under 4A load conditions at elevated ambient temperatures.

Can the LTC3416EFE#TRPBF operate in discontinuous conduction mode (DCM)?

No - the LTC3416EFE#TRPBF operates exclusively in forced continuous conduction mode (FCCM) to ensure predictable transient response and reduced EMI. This behavior is hard-coded in its current-mode architecture and cannot be disabled. FCCM eliminates the variable-frequency operation and associated noise peaks typical of DCM, making the LTC3416EFE#TRPBF suitable for noise-sensitive applications like portable instrumentation and audio systems.

What is the purpose of the ITH pin on the LTC3416EFE#TRPBF?

The ITH pin on the LTC3416EFE#TRPBF serves as the error amplifier output and peak current threshold control node. Its voltage (0.2V–1.4V) directly sets the inductor peak current limit. It is also the primary compensation point for the control loop - connecting a resistor-capacitor network here adjusts phase margin and transient response. This dual role is explicitly documented in the LTC3416EFE#TRPBF datasheet's Pin Functions and Functional Diagram sections.