Analog Devices Inc. LTC3416EFE#PBF

Overview

LTC3416EFE#PBF 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, ±2% output voltage accuracy, and tracking capability for supply sequencing in multi-rail systems.

For engineers reviewing the LTC3416EFE#PBF datasheet, LTC3416EFE#PBF pinout, LTC3416EFE#PBF application, or LTC3416EFE#PBF equivalent, key selection criteria include input voltage range (2.25V–5.5V), 0.8V reference enabling sub-1V outputs, 100% duty cycle low-dropout operation, OPTI-LOOP® compensation for wide-load transient optimization, and thermal performance in the 20-lead TSSOP package with exposed pad.

Technical Context

The LTC3416EFE#PBF employs a constant-frequency current-mode architecture with dual internal MOSFETs (67mΩ P-FET, 50mΩ N-FET), enabling forced continuous conduction mode for low noise and fast transient response. Its ITH pin controls peak current limit (6A–8A) and integrates slope compensation recovery to maintain consistent inductor peak current across duty cycles >40%.

Voltage tracking is implemented via the TRACK pin (0–0.8V range), allowing ratiometric or coincident sequencing of core/I/O rails; the device also features overtemperature protection (125°C TJ max), undervoltage lockout (1.75V–2.25V), and open-drain PGOOD with ±7.5% output voltage monitoring tolerance.

Key Specifications

Pinout & Package

Package: 20-lead thermally enhanced TSSOP with exposed pad (Pin 21), θ_JA = 38°C/W, θ_JC = 10°C/W. Exposed pad must be soldered 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-down regulator applications.

Compared with TPS544B20RJER and MP2315GJ-Z, the LTC3416EFE#PBF uniquely combines analog tracking, 2.25V minimum input, and OPTI-LOOP® for optimal transient response in low-voltage portable systems-making it irreplaceable where hardware-based sequencing and sub-3V operation are mandatory.

Availability

LTC3416EFE#PBF is available at Aetrix Electronics and suitable for portable instruments, notebook computers, distributed power systems, and battery-powered equipment requiring stable component supply with guaranteed long-term manufacturability.

Supply support for LTC3416EFE#PBF 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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.

The LTC3416EFE#PBF belongs to ADI's Power by Linear™ portfolio of high-efficiency DC/DC converters, designed specifically for space-constrained, high-current POL applications demanding precision regulation, robust sequencing, and thermal resilience in portable and embedded systems.

FAQ

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

The LTC3416EFE#PBF supports a minimum input voltage of 2.25V, enabling direct operation from single-cell Li-ion batteries down to end-of-discharge. This specification is guaranteed over the full –40°C to 85°C operating temperature range and allows 100% duty cycle operation to maintain regulation as VIN approaches VOUT. Below 2.25V, undervoltage lockout activates at 1.75V–2.25V threshold.

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

The TRACK pin on the LTC3416EFE#PBF enables hardware-based voltage sequencing by accepting an external voltage (0–0.8V) to force the feedback loop to regulate VFB to that value. When TRACK voltage exceeds 0.8V, tracking control is gradually released; full release occurs above 1.05V. This allows precise coincident or ratiometric startup of multiple rails without external controllers-critical for preventing latch-up in microprocessors and FPGAs.

Can the LTC3416EFE#PBF operate without an external RT resistor?

No, the LTC3416EFE#PBF requires an external resistor connected between the RT pin and ground to set its switching frequency. The oscillator relies on this resistor to determine the ramp current charging an internal timing capacitor. Without it, the device will not switch. The practical frequency range is 300kHz to 4MHz; 294kΩ yields ~1MHz. Leaving RT open or shorted results in undefined or disabled operation.

What thermal design considerations apply to the LTC3416EFE#PBF?

The LTC3416EFE#PBF has θ_JA = 38°C/W in its 20-lead TSSOP package and requires the exposed pad (Pin 21) to be soldered to a PCB ground plane for effective heat dissipation. At 4A load and 85°C ambient, thermal analysis must confirm junction temperature remains below 125°C. Layout best practices include minimizing SW node copper area, using multiple vias under the exposed pad, and separating PGND/SGND planes with single-point connection.

Does the LTC3416EFE#PBF support forced continuous conduction mode (FCCM)?

Yes, the LTC3416EFE#PBF operates exclusively in forced continuous conduction mode, eliminating discontinuous mode transitions. This ensures consistent switching frequency, reduced output voltage ripple, lower EMI, and superior transient response-especially beneficial in POL applications powering sensitive analog or RF circuitry where noise and instability must be minimized.