Analog Devices Inc. LTC3407AEMSE-2#TRPBF

Overview

LTC3407AEMSE-2#TRPBF from Analog Devices (formerly Linear Technology) is a dual synchronous step-down DC/DC converter IC designed for low-power portable applications. It delivers up to 800mA per channel from a 2.5V–5.5V input, regulates two independent outputs from 0.6V to 5V, operates at a fixed 2.25MHz switching frequency, and achieves up to 95% efficiency with Burst Mode operation in handheld devices requiring compact power solutions.

For engineers reviewing the LTC3407AEMSE-2#TRPBF datasheet, LTC3407AEMSE-2#TRPBF pinout, LTC3407AEMSE-2#TRPBF application, or LTC3407AEMSE-2#TRPBF equivalent, key selection criteria include its dual-channel 2.25MHz constant-frequency current-mode architecture, 0.35Ω internal P-channel MOSFET R_DS(ON), 40μA quiescent current in active mode, ±8.5% POR threshold, and MSOP-10 thermal performance with exposed PGND pad.

Technical Context

The LTC3407AEMSE-2#TRPBF employs a current-mode control architecture with shared 2.25MHz oscillator across both channels, enabling precise in-phase switching and excellent transient response. Its MODE/SYNC pin supports either Burst Mode (for <40μA IQ at light load) or pulse-skip mode (for <35mV_PK-PK output ripple), with automatic transition between continuous and low-current modes based on load demand.

Each channel features independent RUN/SS enable/soft-start inputs, dedicated VFB pins referenced to a trimmed 0.6V internal bandgap, and integrated overvoltage/undervoltage detection feeding a common open-drain POR output. Dropout operation maintains regulation down to 100% duty cycle using the internal P-channel high-side switch, while short-circuit protection and thermal shutdown ensure robustness.

Key Specifications

Pinout & Package

Package: 10-Lead Plastic MSOP (MSE), 3mm × 3mm × 1.1mm profile with exposed thermal pad (Pin 11 = PGND). RoHS-compliant, lead-free finish. Thermal resistance θ_JA = 45°C/W, θ_JC = 10°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC3407AEMSE-2#TRPBF, TPS62400DRCT offers simpler fixed-output implementation but sacrifices voltage flexibility and POR assurance, while MAX8646ETE+ enables higher-frequency operation yet increases light-load power consumption and removes critical reset signaling-making LTC3407AEMSE-2#TRPBF optimal for battery-powered systems requiring programmable dual rails and deterministic boot behavior.

Availability

LTC3407AEMSE-2#TRPBF is available at Aetrix Electronics and suitable for digital cameras, cellular phones, wireless modems, and PDAs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for LTC3407AEMSE-2#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, communications, and industrial markets.

The LTC3407A series belongs to Linear's µPower synchronous buck regulator product line, engineered specifically for space-constrained, battery-operated portable electronics demanding high efficiency, low noise, and reliable power sequencing.

FAQ

What is the maximum output current per channel for the LTC3407AEMSE-2#TRPBF?

The LTC3407AEMSE-2#TRPBF delivers up to 800mA per channel continuously under typical thermal conditions. This rating assumes proper PCB layout with the exposed PGND pad soldered to a thermal plane, ambient temperature ≤85°C, and input voltage ≥2.8V. Peak switch current limit is 1.2A (typ), but sustained output is limited by thermal dissipation and inductor saturation.

Does the LTC3407AEMSE-2#TRPBF support independent voltage programming for each output?

Yes, the LTC3407AEMSE-2#TRPBF supports fully independent voltage programming via separate feedback resistive dividers on VFB1 and VFB2 pins. Each channel references the same 0.6V internal bandgap, allowing outputs to be set anywhere from 0.6V to 5V using standard resistor ratios. No coupling or interaction exists between the two regulation loops.

How does the MODE/SYNC pin affect operation of the LTC3407AEMSE-2#TRPBF?

The MODE/SYNC pin on the LTC3407AEMSE-2#TRPBF selects between Burst Mode (pin tied to VIN) for highest light-load efficiency or pulse-skip mode (pin tied to GND) for lowest output ripple. When driven by an external 2.25MHz clock, it forces pulse-skip mode and synchronizes both channels' switching edges to that source.

What is the purpose of the POR pin on the LTC3407AEMSE-2#TRPBF?

The POR (Power-On Reset) pin on the LTC3407AEMSE-2#TRPBF is an open-drain output that remains low until both regulated outputs are within ±8.5% of their target voltages for 65,536 clock cycles (~29ms in pulse-skip mode). It provides a system-level reset signal ensuring microcontrollers and FPGAs initialize only after stable power is established.

Can the LTC3407AEMSE-2#TRPBF operate with input voltage below 2.5V?

No, the LTC3407AEMSE-2#TRPBF has a specified minimum input voltage of 2.5V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.5V may cause undervoltage lockout activation or unstable regulation. The device incorporates UVLO that disables switching when VIN drops below ~1.65V to prevent erratic behavior.