Analog Devices Inc. LTC4151CMS-1#TRPBF

Overview

LTC4151CMS-1#TRPBF from Analog Devices (formerly Linear Technology) is a high-side power monitor IC with integrated 12-bit ΔΣ ADC, operating from 7V to 80V input supply. It continuously measures high-side current (via 81.92mV full-scale differential sense), input voltage (102.4V full-scale), and external ADIN voltage (2.048V full-scale), all reported via I²C. Designed for telecom infrastructure monitoring, it supports opto-isolated bus interfaces using split SDAI/SDAO pins.

For engineers reviewing the LTC4151CMS-1#TRPBF datasheet, LTC4151CMS-1#TRPBF pinout, LTC4151CMS-1#TRPBF application, or LTC4151CMS-1#TRPBF equivalent, key selection criteria include its 10-lead MSOP package, –40°C to 85°C industrial temperature grade, inverted SDAO output for opto-coupler compatibility, 7.5Hz continuous scan rate, and shutdown quiescent current of ≤300µA.

Technical Context

The LTC4151CMS-1#TRPBF implements a ΔΣ ADC architecture that inherently averages noise during conversion, delivering 12-bit resolution with ±1 LSB INL and ±1.25% TUE on VIN measurements. Its dedicated SDAI (data input) and inverted SDAO (data output) pins enable galvanic isolation without level-shifting circuitry - critical for high-voltage telecom systems where ground separation is mandatory.

It operates in two primary modes: default continuous scan (7.5Hz update rate across SENSE, VIN, ADIN) and on-demand snapshot mode, triggered via I²C control register (G7/G6/G5 bits). The SHDN pin is absent in the -1 variant; instead, power management relies on I²C command or host-controlled bus activity.

Key Specifications

Pinout & Package

Package: 10-Lead Plastic MSOP (MS10), 3mm × 3mm footprint, exposed pad optional for thermal relief. Pinout validated per Linear Technology LTC4151-1 MSOP top-view diagram (DD/MS packages share identical pin numbering).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side current and voltage monitoring applications.

Compared with INA226AIDGST, LTC4151CMS-1#TRPBF supports 80V operation and built-in opto-isolation capability, eliminating external components; compared with LTC4151IMS-1#TRPBF, it shares identical electrical specs but carries commercial-grade temperature screening - suitable for cost-sensitive telecom and industrial applications where full industrial qualification is not mandated.

Availability

LTC4151CMS-1#TRPBF is available at Aetrix Electronics and suitable for telecom infrastructure monitoring, industrial 48V DC distribution, and automotive battery telemetry requiring stable component supply across multi-year production cycles.

Supply support for LTC4151CMS-1#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. (ADI) is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies.

The LTC4151 product line was developed by Linear Technology (acquired by ADI in 2017) specifically for high-voltage, isolated power monitoring in telecom, industrial, and automotive systems - emphasizing robustness, integration, and ease of galvanic isolation.

FAQ

What is the maximum input voltage the LTC4151CMS-1#TRPBF can monitor?

The LTC4151CMS-1#TRPBF supports a supply and input voltage range of 7V to 80V. Its VIN pin directly measures the input rail with a 102.4V full-scale range and 25mV LSB resolution, enabling accurate monitoring of telecom +48V systems, industrial 60V rails, and automotive load-dump transients up to 80V. Absolute maximum rating is 90V, but operation above 80V violates specification limits.

Does the LTC4151CMS-1#TRPBF include a shutdown pin?

No, the LTC4151CMS-1#TRPBF does not have a SHDN pin. That feature is exclusive to the base LTC4151 variant. The -1 version replaces SHDN with SDAI and SDAO pins for opto-isolation. Power reduction is achieved via I²C control register (G2/G3 bits) or by halting bus activity - quiescent current drops to ≤300µA in inactive state.

How does the inverted SDAO output on the LTC4151CMS-1#TRPBF improve opto-isolation design?

The inverted SDAO output on the LTC4151CMS-1#TRPBF allows direct connection to the anode of standard opto-couplers (e.g., MOCD207M) without external inverters. When SDAO goes low, the opto-LED turns on - matching the active-low logic expected by common coupler drivers. This eliminates discrete inverters and reduces component count, PCB area, and signal propagation delay in isolated telemetry links.

Can the LTC4151CMS-1#TRPBF measure current and voltage simultaneously?

The LTC4151CMS-1#TRPBF performs sequential measurements in continuous scan mode: SENSE (current), then VIN (input voltage), then ADIN (external voltage), repeating at 7.5Hz. While not truly simultaneous, the 53ms conversion time per channel and deterministic order enable tightly correlated sampling - sufficient for power calculation (P = V × I) in non-transient conditions. Snapshot mode allows on-demand single-channel reads without disrupting the sequence.

What I²C addresses are supported by the LTC4151CMS-1#TRPBF?

The LTC4151CMS-1#TRPBF supports nine configurable I²C addresses via ADR1 and ADR0 pins (tied to VIN, GND, or left open). Valid addresses include 0xCC (mass write), 0xCE, 0xD0, 0xD2, 0xD4, 0xD6, 0xD8, 0xDA, and 0xDE - allowing up to nine devices on one bus. Address configuration is detailed in Table 1 of the datasheet, and no external pull-ups are needed on ADR pins.