Analog Devices Inc. LTC1474CMS8-5#TRPBF

Overview

LTC1474CMS8-5#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, low-quiescent-current step-down DC/DC converter with internal P-channel MOSFET, fixed 5V output, and 8-lead MSOP package. It delivers up to 250mA load current, achieves >92% peak efficiency at 10V input, draws only 10µA no-load supply current, and supports 3V–18V input range - ideal for battery-powered portable instrumentation requiring stable 5V rail generation.

For engineers reviewing the LTC1474CMS8-5#TRPBF datasheet, LTC1474CMS8-5#TRPBF pinout, LTC1474CMS8-5#TRPBF application, or LTC1474CMS8-5#TRPBF equivalent, key selection criteria include its 1.4Ω internal switch R_DS(ON), programmable current limit (325–400mA), 100% duty-cycle low-dropout capability, active-low micropower shutdown (6µA), and integrated low-battery detector functional during shutdown.

Technical Context

The LTC1474CMS8-5#TRPBF uses Burst Mode™ operation to maintain regulation while minimizing quiescent current: it alternates short switching bursts (with 4.75µs off-time) and sleep cycles where only reference, voltage comparator, and low-battery comparator remain active. Its peak-current control loop monitors switch current via internal 5Ω sense resistor plus optional external R_SENSE, tripping at 100mV threshold to limit I_PEAK.

This device implements a fixed-output architecture with internal 1.23V reference and resistive divider (1.68MΩ/3MΩ) to set V_OUT = 5.000V ±2%. Unlike the LTC1475 variant, it uses logic-level RUN pin control (ground = shutdown, open/high = run) and lacks pushbutton on/off functionality - confirming its identity as the LTC1474 series fixed-5V MSOP variant.

Key Specifications

Pinout & Package

Package: 8-lead MSOP (3mm × 3mm, 0.65mm pitch), RoHS-compliant, moisture-sensitive level 1. Thermal resistance θ_JA = 150°C/W (JEDEC standard board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC1474CS8-5#PBF, the LTC1474CMS8-5#TRPBF trades thermal margin for 60% smaller PCB area and tape-and-reel packaging; versus TPS62231DRYR, it delivers 60% lower no-load current but requires careful EMI mitigation due to variable-frequency operation.

Availability

LTC1474CMS8-5#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, wireless sensor nodes, industrial handheld terminals, and smart meter auxiliary power requiring stable component supply with guaranteed long-term manufacturability.

Supply support for LTC1474CMS8-5#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 LTC1474CMS8-5#TRPBF belongs to Linear's legacy high-efficiency, ultralow-IQ DC/DC converter family - designed specifically for battery-operated portable equipment demanding multi-year runtime and reliable low-voltage operation.

FAQ

What is the maximum continuous output current of the LTC1474CMS8-5#TRPBF?

The LTC1474CMS8-5#TRPBF supports up to 250mA continuous output current under typical conditions (VIN = 10V, TA = 25°C, 100µH inductor, MBR0530 diode). Derating is required above 70°C ambient or with higher VIN due to thermal limits - the 1.4Ω internal switch and 150°C/W θ_JA constrain power dissipation to ~350mW. For sustained 250mA, ensure adequate copper area and airflow.

Does the LTC1474CMS8-5#TRPBF require an external current sense resistor?

No, the LTC1474CMS8-5#TRPBF does not require an external current sense resistor. It defaults to a 325–400mA peak current limit using its internal 5Ω sense element when SENSE (Pin 6) is shorted to VIN (Pin 7). An external resistor is optional - used only to reduce peak current for lower-noise or lower-ripple designs, or to match specific inductor saturation limits.

Can the LTC1474CMS8-5#TRPBF operate with input voltage below 3V?

No, the LTC1474CMS8-5#TRPBF has a minimum specified input voltage of 3V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 3V is not guaranteed: internal bias circuitry may fail to start, reference voltage may collapse, and regulation cannot be maintained. For sub-3V inputs, consider the LTC3642 or similar ultra-low-VIN buck regulators.

How does the low-battery detector function during shutdown of the LTC1474CMS8-5#TRPBF?

The low-battery detector in the LTC1474CMS8-5#TRPBF remains fully operational during shutdown: the 1.23V reference and comparator continue drawing current from VIN, comparing LBI (Pin 3) voltage to the reference. When LBI falls below 1.23V (±5mV hysteresis), LBO (Pin 2) sinks current - enabling battery monitoring without waking the main regulator or consuming additional system power.

Is the LTC1474CMS8-5#TRPBF pin-compatible with the LTC1475CMS8-5#TRPBF?

No, the LTC1474CMS8-5#TRPBF is not pin-compatible with the LTC1475CMS8-5#TRPBF. While both use MSOP-8 packages and share identical Pin 1–4 and 6–8 functions, Pin 3 (LBI) on the LTC1474CMS8-5#TRPBF is dedicated low-battery input, whereas Pin 3 on the LTC1475CMS8-5#TRPBF serves dual role as LBI/OFF - requiring different external circuitry and control logic. Swapping them will cause malfunction.