Analog Devices Inc. LTC2920-1CS5#TRMPBF

Overview

LTC2920-1CS5#TRMPBF from Analog Devices (formerly Linear Technology) is a single-channel precision power supply voltage margining controller IC that sources or sinks programmable current into the feedback node of DC/DC converters or power modules to adjust output voltage ±5% for automated production testing. It features 0.4% typical margining accuracy, 400:1 adjustable current range (5μA–2mA), and operates from 2.3V to 6V VCC. Used in high-reliability PCB test systems to verify component operation at voltage extremes.

For engineers reviewing the LTC2920-1CS5#TRMPBF datasheet, LTC2920-1CS5#TRMPBF pinout, LTC2920-1CS5#TRMPBF application, or LTC2920-1CS5#TRMPBF equivalent, key selection criteria include margin current accuracy over temperature, IM output compliance voltage range (0.55V to VCC–0.55V), single-resistor current programming, three-state control logic (High/Float/Low), and ThinSOT-5 package compatibility with automated test fixtures.

Technical Context

The LTC2920-1CS5#TRMPBF implements a precision current-source/sink architecture controlled by a 3-level digital input (IN1), enabling symmetric or asymmetric up/down voltage margining via feedback node injection. Its internal trimmed voltage reference ensures <0.4% typical margining accuracy across 0°C to 70°C.

Current magnitude is set by a single external resistor (RSET) connected between RS1 and either GND (low range: ×1 multiplier) or VCC (high range: ×30 multiplier), delivering 5–167μA or 0.15–2mA respectively. IM1 output maintains compliance from 0.55V to (VCC – 0.55V), with turn-on/off times under 100μs and leakage <100nA in high-impedance state.

Key Specifications

Pinout & Package

Package: 5-lead ThinSOT™ (S5), 0.95mm height, RoHS-compliant, moisture-sensitive level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar power supply margining applications.

Compared with MAX5487ETE+ and TPS65987D, the LTC2920-1CS5#TRMPBF delivers plug-and-play analog margining with minimal external components, guaranteed accuracy over temperature, and direct compatibility with any feedback-based power supply-making it optimal for dedicated, high-volume production test environments.

Availability

LTC2920-1CS5#TRMPBF is available at Aetrix Electronics and suitable for automated PCB functional testing, DC/DC converter validation, and power module burn-in requiring stable component supply and consistent parametric performance across production lots.

Supply support for LTC2920-1CS5#TRMPBF 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 semiconductors, formed through the acquisition of Linear Technology in 2017.

The LTC2920 family was designed specifically for automated power supply voltage margining in high-reliability manufacturing test environments, emphasizing precision, simplicity, and robustness over digital configurability.

FAQ

What is the primary function of the LTC2920-1CS5#TRMPBF?

The LTC2920-1CS5#TRMPBF is a single-channel precision power supply margining controller that sources or sinks programmable current into the feedback node of DC/DC converters or power modules. It enables automated adjustment of output voltage up to ±5% for production test verification, using a single external resistor for current setting and a three-state digital control input for direction and enable.

How does the LTC2920-1CS5#TRMPBF achieve voltage margining accuracy better than 0.4%?

The LTC2920-1CS5#TRMPBF achieves <0.4% typical margining accuracy through an internally trimmed voltage reference and precision current mirror architecture. Its IM1 current accuracy is specified at ±3% to ±25% depending on range and grade, but system-level margining error remains <0.4% due to tight matching between reference and current-setting circuitry-verified across 0°C to 70°C for the C-grade LTC2920-1CS5#TRMPBF.

Can the LTC2920-1CS5#TRMPBF be used with power supply modules that have a trim pin instead of a feedback pin?

Yes, the LTC2920-1CS5#TRMPBF can drive the trim pin of "brick"-type DC/DC modules. By measuring the module's trim current vs. output voltage change (KTRIM), users calculate required ITRIM for desired VMARGIN, then select RSET accordingly. The LTC2920-1CS5#TRMPBF's wide compliance range (0.55V to VCC–0.55V) and low leakage (<100nA) ensure reliable operation when interfacing with high-impedance trim nodes.

What are the critical power sequencing requirements for the LTC2920-1CS5#TRMPBF?

VCC must be powered no later than the controlled power supply's startup to prevent IM1 fault current. The LTC2920-1CS5#TRMPBF requires VCC ≥ (IM1 voltage + 0.2V) at all times; best practice is connecting VCC to the margined supply's VIN or VOUT if within 2.3V–6V. If using an independent rail, add a Schottky diode to ensure VCC tracks the supply being tested.

Is the LTC2920-1CS5#TRMPBF compatible with low-voltage rails such as 1.2V or 1.8V?

Yes, the LTC2920-1CS5#TRMPBF supports margining of low-voltage rails. With VCC ≥ 2.3V, its IM1 output maintains compliance down to 0.55V-enabling use with 1.2V/1.8V supplies when the feedback node voltage stays within that window. For example, margining a 1.2V rail with ±5% (±60mV) requires IM1 to operate at ~1.14V–1.26V, well within the device's 0.55V–(VCC–0.55V) range at VCC = 3.3V.