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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Supply Controllers, Monitors

Analog Devices Inc. LTC2920-2CMS8#TRPBF

Name: LTC2920-2CMS8#TRPBF
Brand: Analog Devices Inc.
SKU: LTC2920-2CMS8#TRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LTC2920-2CMS8#TRPBF

Manufacturer:: Analog Devices Inc.

Category:: Power Supply Controllers, Monitors

Package:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Datasheet:: LTC2920-2CMS8#TRPBF.pdf

Description:: IC SNGL/DUAL PWR SUP CTRLR 8MSOP

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Product details

Overview

LTC2920-2CMS8#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel precision power supply voltage margining controller IC used in automated production test systems to inject calibrated current into feedback or trim pins of DC/DC converters and power modules. It supports symmetric or asymmetric high/low margining with ±5 μA to ±2 mA programmable current per channel, 0.4% typical margin accuracy, and operates from 2.3V to 6V V_CC. It enables 5% voltage margining on 3.3V supplies in telecom and server power applications.

For engineers reviewing the LTC2920-2CMS8#TRPBF datasheet, LTC2920-2CMS8#TRPBF pinout, LTC2920-2CMS8#TRPBF application, or LTC2920-2CMS8#TRPBF equivalent, key selection criteria include dual independent margining channels, 400:1 current programming range via single R_SET per channel, 0.6V to (V_CC – 0.6V) output compliance, three-state control logic (High/Float/Low), and MSOP-8 package compatibility with automated PCB testing infrastructure.

Technical Context

The LTC2920-2CMS8#TRPBF integrates two fully independent margining channels, each with dedicated INx control input, RSx current-set interface, and IMx current-source/sink output. Each channel uses internal 1.2V reference and resistor-programmable current scaling (×1 for low range, ×30 for high range) to achieve precise ±5 μA–±2 mA sourcing/sinking.

Its three-state control architecture-logic-high (sink), logic-low (source), and floating/1.1–1.4V (high-Z)-enables seamless integration with system controllers and avoids unintended margin activation during idle states. Output compliance (0.55V to V_CC – 0.55V) and <100 ns fall time ensure fast, stable response during automated test sequences without oscillation or overshoot.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.3V to 6V - powers internal circuitry and supplies current to IM outputs; must exceed IM voltage by ≥0.2V to prevent fault current.
Margin Current Range	±5 μA to ±2 mA per channel - selectable via R_SET tied to GND (low range) or V_CC (high range); enables 5% margining on 3.3V/500Ω feedback networks.
Current Accuracy	±3% to ±25% depending on range and grade - C-grade: ±3% typ at 1.5–2 mA, ±5% typ at 5–30 μA; defines achievable voltage margin tolerance in production test.
Output Compliance	0.55V to (V_CC – 0.55V) - guarantees specified current delivery across this voltage window; critical for interfacing with feedback nodes at varying bias points.
Control Logic States	Three-state per channel (VIH ≥2.4V, VIL ≤0.6V, VOFF = 1.1–1.4V) - eliminates need for external level-shifting or pull-up/down resistors in digital test systems.
Turn-Off Time	15–100 μs - ensures rapid deactivation between test steps; prevents residual margin current from affecting subsequent measurements.
Quiescent Current	0.23–1 mA - low standby draw enables use in multi-channel test fixtures without excessive thermal load or supply burden.

Pinout & Package

Package: 8-lead MSOP (MS8), 3mm × 3mm, 0.65mm pitch, exposed pad (not electrically connected). RoHS-compliant, halogen-free, rated for 0°C to 70°C operation (C-grade).

Pin	Circuit Role	Design Meaning
1	RS2	Current-set input for Channel 2; connect R_SET2 to GND for ±5–167 μA range or to V_CC for ±0.15–2 mA range.
2	IN2	Three-state control for Channel 2: >2.4V = sink, <0.6V = source, 1.1–1.4V = high-Z; internal ~10kΩ pull-up to 1.2V.
3	IN1	Three-state control for Channel 1: identical behavior to IN2; enables independent sequencing of two power rails.
4	RS1	Current-set input for Channel 1; functionally identical to RS2; allows asymmetric margining (e.g., +3% on V_CC, –5% on V_DDR).
5	IM1	Channel 1 current output; connects directly to feedback or trim pin; sources/sinks current based on IN1/RS1 state.
6	GND	Power and signal reference; return path for sunk IM current; must be tied to power supply ground for accurate margining.
7	IM2	Channel 2 current output; electrically isolated from IM1; supports simultaneous margining of two independent supplies.
8	V_CC	Supply input; powers all internal circuits and sources IM output current; requires ≥0.1 μF local bypass to GND.

Key Features

Feature	Design Value
Dual independent margining channels	Enables concurrent high/low margining of two power rails (e.g., core and I/O) without shared timing or control constraints.
400:1 programmable current range per channel	Single R_SET resistor per channel selects between low (5–167 μA) and high (150 μA–2 mA) ranges, simplifying BOM and layout.
0.4% typical margin accuracy	Reduces need for post-test calibration; supports tight voltage tolerances required in telecom and high-reliability server applications.
Three-state control logic (High/Float/Low)	Eliminates risk of unintended margin activation during system reset or idle states; removes need for external enable logic.
Wide output compliance (0.6V to V_CC – 0.6V)	Ensures reliable current delivery across common feedback node voltages (e.g., 1.2V reference nodes, 2.5V trim pins).

Applications

Telecom Power Supply Margining	Server Board Production Test
Use Scenario: Automated functional test of 48V-to-12V intermediate bus converters in telecom shelf assemblies. IC Role / Device Role / Timing Role: LTC2920-2CMS8#TRPBF injects ±120 μA into feedback node to achieve ±1% output margin, verifying regulation stability at voltage extremes. Use Value: Replaces manual resistor-swapping with deterministic, repeatable current injection, reducing test cycle time by 40% and eliminating human error.	Use Scenario: In-circuit validation of 1.8V DDR memory rail and 0.85V CPU core rail on high-density server motherboards. IC Role / Device Role / Timing Role: LTC2920-2CMS8#TRPBF independently margins both rails using IN1/IN2 control signals synchronized to tester strobes. Use Value: Enables simultaneous dual-rail stress testing within single test step, improving yield analysis granularity and reducing fixture complexity.
Industrial PLC Power Module Calibration	Medical Imaging Power Sequencing Verification
Use Scenario: Factory calibration of isolated 24V DC/DC modules used in programmable logic controllers. IC Role / Device Role / Timing Role: LTC2920-2CMS8#TRPBF applies asymmetric margin (+2.5% on output, –3.0% on sense) to validate module line/load regulation specs. Use Value: Achieves traceable ±0.1% voltage margin without external DACs or op-amp circuits, meeting ISO 13849 functional safety audit requirements.	Use Scenario: End-of-line verification of power sequencing integrity in MRI subsystem power trees. IC Role / Device Role / Timing Role: LTC2920-2CMS8#TRPBF margins auxiliary 5V and 3.3V rails while monitoring startup timing with oscilloscope triggers. Use Value: Confirms no rail inversion or hold-off violation under worst-case margin conditions, preventing field failures due to marginal sequencing.

Telecom Power Supply Margining

Server Board Production Test

Use Scenario: Automated functional test of 48V-to-12V intermediate bus converters in telecom shelf assemblies.

IC Role / Device Role / Timing Role: LTC2920-2CMS8#TRPBF injects ±120 μA into feedback node to achieve ±1% output margin, verifying regulation stability at voltage extremes.

Use Value: Replaces manual resistor-swapping with deterministic, repeatable current injection, reducing test cycle time by 40% and eliminating human error.

Use Scenario: In-circuit validation of 1.8V DDR memory rail and 0.85V CPU core rail on high-density server motherboards.

IC Role / Device Role / Timing Role: LTC2920-2CMS8#TRPBF independently margins both rails using IN1/IN2 control signals synchronized to tester strobes.

Use Value: Enables simultaneous dual-rail stress testing within single test step, improving yield analysis granularity and reducing fixture complexity.

Industrial PLC Power Module Calibration

Medical Imaging Power Sequencing Verification

Use Scenario: Factory calibration of isolated 24V DC/DC modules used in programmable logic controllers.

IC Role / Device Role / Timing Role: LTC2920-2CMS8#TRPBF applies asymmetric margin (+2.5% on output, –3.0% on sense) to validate module line/load regulation specs.

Use Value: Achieves traceable ±0.1% voltage margin without external DACs or op-amp circuits, meeting ISO 13849 functional safety audit requirements.

Use Scenario: End-of-line verification of power sequencing integrity in MRI subsystem power trees.

IC Role / Device Role / Timing Role: LTC2920-2CMS8#TRPBF margins auxiliary 5V and 3.3V rails while monitoring startup timing with oscilloscope triggers.

Use Value: Confirms no rail inversion or hold-off violation under worst-case margin conditions, preventing field failures due to marginal sequencing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX5992ETE+	Single-channel only; requires external logic for dual-rail control; higher quiescent current (2.5 mA); no floating-state control.	Suitable for cost-sensitive, single-supply margining where board space is constrained but dual-channel capability is not required.	Select MAX5992ETE+ only when margining one rail and lower component count outweighs loss of independent dual-channel control.
TPS65987D	USB-C PD controller with integrated margining DAC; limited to ±1% resolution; no discrete current-sink/source capability; requires firmware configuration.	Applicable only in USB-C powered devices needing PD-compliant margining; unsuitable for general-purpose DC/DC or brick-module margining.	Choose TPS65987D exclusively for USB-C E-marked accessories requiring PD protocol-aware voltage adjustment-not for industrial or telecom test fixtures.

Compared with LTC2920-2CMS8#TRPBF, MAX5992ETE+ lacks dual-channel independence and floating-state logic, increasing system design overhead, while TPS65987D ties margining functionality to USB-C PD firmware and offers coarser resolution-neither provides the same combination of analog precision, hardware-based dual control, and wide compliance range.

Availability

LTC2920-2CMS8#TRPBF is available at Aetrix Electronics and suitable for telecom power supply validation, server board production test, industrial PLC calibration, and medical imaging power sequencing verification requiring stable component supply and long-term test fixture continuity.

Supply support for LTC2920-2CMS8#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 (acquired Linear Technology in 2017) designs high-performance analog, mixed-signal, and power management ICs for precision measurement, industrial automation, and communications infrastructure.

The LTC2920 product line delivers hardware-based, resistor-programmable power supply margining controllers optimized for automated PCB test environments where repeatability, speed, and dual-rail independence are critical.

FAQ

What is the maximum margin current per channel supported by the LTC2920-2CMS8#TRPBF?

The LTC2920-2CMS8#TRPBF supports up to ±2 mA per channel in high-range mode (R_SET tied to V_CC) and ±167 μA in low-range mode (R_SET tied to GND). This 400:1 programmable range allows precise margining of both high-current and low-bias power rails using a single IC. The actual delivered current depends on R_SET value and operating temperature, with accuracy specified per grade (C or I) in the datasheet.

Can the LTC2920-2CMS8#TRPBF margin two different power supplies simultaneously?

Yes, the LTC2920-2CMS8#TRPBF is explicitly designed for simultaneous dual-rail margining. Channel 1 (IN1/RS1/IM1) and Channel 2 (IN2/RS2/IM2) operate completely independently-each with its own control pin, current-set resistor, and output driver. This enables asymmetric margining (e.g., +3% on V_CCIO, –4% on V_CORE) without cross-talk or shared timing constraints, as confirmed in the device's functional block diagram and application schematics.

What is the purpose of the floating state (1.1V–1.4V) on the IN1 and IN2 pins of the LTC2920-2CMS8#TRPBF?

The floating state on IN1 and IN2 disables current output on the corresponding IM pin, placing it in high-impedance mode. This prevents unintended margining during system initialization, idle periods, or controller reset-critical for avoiding overvoltage faults. Internally, each IN pin connects to a 1.2V reference via ~10kΩ, ensuring reliable float detection without external components, as detailed in the Pin Functions section of the datasheet.

How does the LTC2920-2CMS8#TRPBF ensure accurate voltage margining despite variations in feedback resistor tolerance?

The LTC2920-2CMS8#TRPBF achieves 0.4% typical margin accuracy through an internal trimmed voltage reference and matched current-source architecture. While feedback resistor (R_F) tolerance contributes to overall system error, the LTC2920-2CMS8#TRPBF's current accuracy dominates the margining precision-especially since VMARGIN = I_MARGIN × R_F. Using 0.1% R_F resistors minimizes this secondary error, as validated in Figure 11 of the datasheet showing error contributions.

Is the LTC2920-2CMS8#TRPBF compatible with power supply modules that use trim pins instead of feedback nodes?

Yes, the LTC2920-2CMS8#TRPBF is explicitly qualified for trim-pin margining of "brick"-type DC/DC modules. Its wide output compliance (0.55V to V_CC – 0.55V) and ability to source/sink current into high-impedance trim nodes make it suitable for linear current-trim interfaces. Application Note 2920-1/2 details trim-pin characterization methods and confirms compatibility with common telecom and industrial modules.

LTC2920-2CMS8#TRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Applications:: Single/Dual Power Supply Controller

Voltage - Input:: -

Voltage - Supply:: 2.3V ~ 6V

Current - Supply:: 230 µA

Operating Temperature:: 0°C ~ 70°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-MSOP

LTC2920-2CMS8#TRPBF FAQ

1.How can I place an order for LTC2920-2CMS8#TRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LTC2920-2CMS8#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LTC2920-2CMS8#TRPBF reliable?

The price and inventory of LTC2920-2CMS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2920-2CMS8#TRPBF is usually 5 days.

3.What payment methods are accepted for LTC2920-2CMS8#TRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2920-2CMS8#TRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LTC2920-2CMS8#TRPBF?

LTC2920-2CMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LTC2920-2CMS8#TRPBF order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LTC2920-2CMS8#TRPBF?

For technical support, including LTC2920-2CMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2920-2CMS8#TRPBF requirements.

6.How does Aetrix verify that LTC2920-2CMS8#TRPBF is sourced from the original manufacturer or authorized distributors?

All LTC2920-2CMS8#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC2920-2CMS8#TRPBF meets industry standards.

7.What is the process for return or replacement of LTC2920-2CMS8#TRPBF?

All LTC2920-2CMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2920-2CMS8#TRPBF, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LTC2920-2CMS8#TRPBF part is unused and in its original packaging.

Return procedure for LTC2920-2CMS8#TRPBF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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