Analog Devices Inc. LTC3315BJV#TRPBF

Overview

LTC3315BJV#TRPBF from Analog Devices is a dual monolithic synchronous step-down DC/DC converter delivering 2A per channel from a 2.25V–5.5V input, regulating outputs as low as 500mV with ±1% feedback accuracy and 6MHz switching frequency in a thermally enhanced 2mm × 2mm LQFN-12 package. It integrates two independent 2A buck regulators with 180° phase interleaving, internal compensation, and precision enable thresholds-designed for FPGA, ASIC, and µP core supplies in space-constrained automotive and industrial systems.

For engineers reviewing the LTC3315BJV#TRPBF datasheet, LTC3315BJV#TRPBF pinout, LTC3315BJV#TRPBF application, or LTC3315BJV#TRPBF equivalent, key selection criteria include its AEC-Q100 qualification (–40°C to 150°C junction), 25ns minimum on-time, 19mΩ NMOS / 75mΩ PMOS R_DS(ON), Burst Mode® operation for light-load efficiency, and MODE/SYNC pin programmability across forced continuous, pulse-skip, and Burst Mode®.

Technical Context

The LTC3315BJV#TRPBF employs peak current mode control with internal slope compensation, enabling stable operation up to 10MHz synchronization while maintaining fast transient response via 25ns minimum on-time and 180° interleaved switching. Its dual-buck architecture shares a common oscillator but maintains independent FB, EN, and SW pins for flexible output configuration and sequencing.

Each regulator features forward/reverse inductor current limiting, soft-start with 0.25–3ms ramp time, output overvoltage protection (110% V_OUT threshold), and thermal shutdown at 165°C with 5°C hysteresis. The MODE/SYNC pin selects operating mode-Burst Mode® (high), pulse-skip (low), or forced continuous (floating)-and serves as synchronization input for external clocks from 3MHz to 10MHz.

Key Specifications

Pinout & Package

Package: 12-lead LQFN (2mm × 2mm × 0.74mm) with exposed thermal pad (Pin 13 = GND). Thermally enhanced design achieves θ_JA = 51°C/W and θ_JB = 12°C/W when soldered to PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output buck regulator applications.

Compared with TPS62150ARGTR and MP2451DT-LF-Z, the LTC3315BJV#TRPBF delivers true dual-rail integration with phase interleaving, AEC-Q100 qualification, and sub-3V operation-reducing component count, PCB area, and thermal footprint in demanding embedded systems.

Availability

LTC3315BJV#TRPBF is available at Aetrix Electronics and suitable for FPGA core supplies, automotive ADAS processors, and optical networking line cards requiring stable component supply with long-term automotive-grade availability.

Supply support for LTC3315BJV#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision power, sensing, and timing solutions.

The LTC3315B product line delivers highly integrated, high-frequency dual buck regulators targeting space-constrained, high-reliability applications such as automotive infotainment, server POL, and FPGA/ASIC core supplies-emphasizing thermal robustness, light-load efficiency, and seamless system integration.

FAQ

What is the maximum junction temperature rating for the LTC3315BJV#TRPBF?

The LTC3315BJV#TRPBF is rated for operation up to 150°C junction temperature and is AEC-Q100 qualified for automotive Grade 1 applications. Its overtemperature shutdown activates at 165°C (typical) with 5°C hysteresis, and thermal performance relies on proper soldering of the exposed pad to a PCB ground plane to achieve θ_JB = 12°C/W.

Does the LTC3315BJV#TRPBF support independent enable and feedback for each buck channel?

Yes, the LTC3315BJV#TRPBF provides fully independent control: EN1/FB1 for Buck 1 and EN2/FB2 for Buck 2. Each enable pin has a precision 400mV threshold, and each feedback pin regulates to 500mV, allowing separate voltage programming, sequencing, and fault monitoring-critical for multi-rail digital systems.

Can the LTC3315BJV#TRPBF synchronize to an external clock, and what is the supported frequency range?

Yes, the LTC3315BJV#TRPBF accepts an external clock on the MODE/SYNC pin for synchronization across 3MHz to 10MHz. During sync, both bucks operate in forced continuous mode with Buck 1 aligned to the rising edge and Buck 2 180° out of phase-enabling EMI reduction and deterministic timing in noise-sensitive systems.

What protection features does the LTC3315BJV#TRPBF include?

The LTC3315BJV#TRPBF integrates output overvoltage protection (110% V_OUT trip), thermal shutdown (165°C), undervoltage lockout (2.25V start), short-circuit recovery, and reverse-current limiting. Its PGOOD pin reports faults-including UVLO, OT, or any buck falling outside 97–99% regulation-with 120µs filtering to reject transients.

How does the LTC3315BJV#TRPBF achieve high efficiency at light loads?

The LTC3315BJV#TRPBF uses Burst Mode® operation-where the regulator bursts charge the output capacitor above regulation, then sleeps while the load draws from capacitance. This reduces quiescent current to ~70µA (both bucks enabled), achieving >85% efficiency at 1mA load while maintaining low output ripple.