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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > DC DC Switching Controllers

Analog Devices Inc. LTC3872ETS8-1#TRPBF

Name: LTC3872ETS8-1#TRPBF
Brand: Analog Devices Inc.
SKU: LTC3872ETS8-1#TRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LTC3872ETS8-1#TRPBF

Manufacturer:: Analog Devices Inc.

Category:: DC DC Switching Controllers

Package:: SOT-23-8 Thin, TSOT-23-8

Datasheet:: LTC3872ETS8-1#TRPBF.pdf

Description:: IC REG CTRLR BOOST TSOT23-8

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Product details

Overview

LTC3872ETS8-1#TRPBF from Analog Devices (formerly Linear Technology) is a constant-frequency current-mode DC/DC boost controller driving an external N-channel MOSFET without requiring a sense resistor. It operates from 2.75V to 9.8V input, delivers up to 60V output, achieves ±1.5% output voltage accuracy, and runs at 550kHz switching frequency-enabling compact 3.3V-to-5V, 2A telecom and IP phone power supplies.

For engineers reviewing the LTC3872ETS8-1#TRPBF datasheet, LTC3872ETS8-1#TRPBF pinout, LTC3872ETS8-1#TRPBF application, or LTC3872ETS8-1#TRPBF equivalent, key selection considerations include No RSENSE™ MOSFET-based current sensing, adjustable peak current limit via IPRG pin, internal soft-start, pulse-skipping light-load operation, and TSOT-23-8 package thermal performance (θ_JA = 195°C/W).

Technical Context

The LTC3872ETS8-1#TRPBF implements a No RSENSE™ architecture that senses switch-node voltage across the external MOSFET's R_DS(ON), eliminating discrete current-sense resistors and improving efficiency. Its current-mode control loop uses the ITH pin as error amplifier output and current comparator threshold reference, enabling fast line/load transient response with ±1.5% V_FB accuracy over temperature.

It integrates a 550kHz oscillator, undervoltage lockout (UVLO) with 2.3V rising threshold, RUN/SS pin for shutdown and external soft-start, and NGATE driver capable of swinging 0V to V_IN. Unlike the standard LTC3872, this -1 variant omits frequency foldback during current limit, maintaining fixed-frequency operation under overload.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.75V to 9.8V - supports single-cell Li-ion, 3.3V logic rails, and 5V/9V wall adapters without external LDO pre-regulation.
Switching Frequency	550kHz typical - enables use of sub-2.2µH inductors and reduces output capacitor RMS ripple current requirements.
Output Voltage Accuracy	±1.5% over temperature - ensures stable 5V or 12V rail regulation in telecom and industrial systems with minimal feedback divider tolerance impact.
Peak Current Sense Threshold	105mV (IPRG = GND), 180mV (IPRG = float), 285mV (IPRG = VIN) - sets maximum inductor current without external resistor, directly scaling with MOSFET R_DS(ON).
Undervoltage Lockout	2.3V (rising), 2.05V (falling) - prevents erratic startup or brownout operation when powered from weak or battery-depleted sources.
Operating Junction Temp	–40°C to 85°C - qualified for commercial-grade embedded applications including IP phones and industrial controllers.
Package Thermal Resistance	θ_JA = 195°C/W (TSOT-23-8) - requires minimal copper area for thermal management in space-constrained PCB layouts.

Pinout & Package

Package: 8-lead low-profile (1mm height) TSOT-23, RoHS-compliant, lead-free finish. Exposed pad not present - thermal path relies on standard PCB copper.

Pin	Circuit Role	Design Meaning
1 (IPRG)	Current limit select input	Configures peak current threshold: GND = 105mV, float = 180mV, VIN = 285mV - enables precise MOSFET R_DS(ON)-based current limiting.
2 (ITH)	Error amplifier compensation node	Carries transconductance amplifier output; voltage sets current comparator trip point - used for loop compensation and stability tuning.
3 (VFB)	Feedback input	Monitors resistor-divider output voltage; compared to 1.2V internal reference - determines regulated output voltage (V_OUT = 1.2V × (1 + R2/R1)).
4 (GND)	Analog/digital ground reference	Common return for internal circuitry, feedback, and soft-start - must be connected to low-impedance system ground plane.
5 (NGATE)	N-channel MOSFET gate driver output	Drives external high-side switch; swings 0V to V_IN - requires Schottky clamp diode if MOSFET package inductance risks negative voltage spikes.
6 (VIN)	Power supply input	Bias supply for internal circuitry; must be decoupled with ≥1µF ceramic capacitor close to pin - powers gate driver and control logic.
7 (RUN/SS)	Enable and soft-start control	Pull below 0.85V to shut down (I_Q ≈ 8µA); external capacitor enables linear V_ITH ramp - prevents inrush current and output overshoot.
8 (SW)	Switch node connection	Connects to MOSFET drain and inductor; serves as current sense input for No RSENSE™ operation - must be routed with minimal parasitic inductance.

Key Features

Feature	Design Value
No RSENSE™ current sensing	Eliminates external sense resistor, saving board space and ~0.5W conduction loss at 2A - improves efficiency by 2–3% vs resistor-based solutions.
550kHz fixed-frequency operation	Enables use of 1.0–1.8µH inductors in 3.3V-to-5V designs - reduces solution size by >30% versus 300kHz controllers.
Adjustable peak current limit	Three IPRG configurations allow optimization for MOSFET R_DS(ON) range (e.g., 5mΩ to 30mΩ) - avoids overdesigning FET while ensuring short-circuit robustness.
Pulse-skipping light-load mode	Maintains regulation at <10mA load with <15µA quiescent current - extends battery life in always-on IP phone standby applications.
Internal soft-start + external option	Default 1ms internal ramp prevents output overshoot; optional capacitor on RUN/SS allows user-defined start time - critical for sequencing-sensitive systems.

Applications

Telecom Power Supplies	IP Phone Power Supplies
Use Scenario: Generating isolated 5V/2A bias from 3.3V backplane in VoIP gateway line cards. IC Role / Device Role / Timing Role: Boost controller managing MOSFET switching, current sensing, and output regulation - no external clock required. Use Value: No RSENSE™ architecture eliminates sense resistor losses, enabling >92% efficiency at full load and reducing thermal stress on dense line card PCBs.	Use Scenario: Providing regulated 5V power to Ethernet PHY and DSP in desktop IP phones operating from PoE (37–57V) via intermediate 3.3V rail. IC Role / Device Role / Timing Role: Secondary boost stage stepping 3.3V to 5V with tight line regulation - handles PoE input variation without affecting downstream logic. Use Value: ±1.5% V_FB accuracy and 550kHz operation ensure stable 5V rail with <20mV ripple, meeting IEEE 802.3af timing margin requirements.
42V Automotive Systems	24V Industrial Controls
Use Scenario: Generating 12V auxiliary rail from vehicle battery (9–16V) for infotainment USB ports during cold-crank (down to 6V). IC Role / Device Role / Timing Role: High-input boost controller with UVLO set to 2.3V - remains operational during deep battery sag. Use Value: Wide 2.75–9.8V input range and –40°C to 85°C qualification enable reliable 12V generation even at engine-off battery voltages as low as 7.2V.	Use Scenario: Powering 5V microcontroller and sensors from 24V industrial bus in PLC I/O modules. IC Role / Device Role / Timing Role: Non-isolated boost regulator delivering clean 5V with low EMI - integrated slope compensation avoids external components. Use Value: Pulse-skipping mode draws only 8µA in shutdown and <15µA at light load, reducing standby power in energy-conscious factory automation systems.

Telecom Power Supplies

IP Phone Power Supplies

Use Scenario: Generating isolated 5V/2A bias from 3.3V backplane in VoIP gateway line cards.

IC Role / Device Role / Timing Role: Boost controller managing MOSFET switching, current sensing, and output regulation - no external clock required.

Use Value: No RSENSE™ architecture eliminates sense resistor losses, enabling >92% efficiency at full load and reducing thermal stress on dense line card PCBs.

Use Scenario: Providing regulated 5V power to Ethernet PHY and DSP in desktop IP phones operating from PoE (37–57V) via intermediate 3.3V rail.

IC Role / Device Role / Timing Role: Secondary boost stage stepping 3.3V to 5V with tight line regulation - handles PoE input variation without affecting downstream logic.

Use Value: ±1.5% V_FB accuracy and 550kHz operation ensure stable 5V rail with <20mV ripple, meeting IEEE 802.3af timing margin requirements.

42V Automotive Systems

24V Industrial Controls

Use Scenario: Generating 12V auxiliary rail from vehicle battery (9–16V) for infotainment USB ports during cold-crank (down to 6V).

IC Role / Device Role / Timing Role: High-input boost controller with UVLO set to 2.3V - remains operational during deep battery sag.

Use Value: Wide 2.75–9.8V input range and –40°C to 85°C qualification enable reliable 12V generation even at engine-off battery voltages as low as 7.2V.

Use Scenario: Powering 5V microcontroller and sensors from 24V industrial bus in PLC I/O modules.

IC Role / Device Role / Timing Role: Non-isolated boost regulator delivering clean 5V with low EMI - integrated slope compensation avoids external components.

Use Value: Pulse-skipping mode draws only 8µA in shutdown and <15µA at light load, reducing standby power in energy-conscious factory automation systems.

Equivalent & Alternatives

The following parts are listed as comparable options for similar boost controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LT3957EDD#PBF	Higher 4V–60V input range; includes integrated 3.3A MOSFET; requires external sense resistor.	Targeted at higher-power (>3A) boost/SEPIC; lacks No RSENSE™ architecture and TSOT-23 footprint.	Choose LT3957EDD#PBF only when integrated FET and >3A output are needed - not a drop-in replacement.
TPS61088RHLR	5V–12V input; 2.2MHz switching; integrated 11A FET; fixed 5V/12V options; no IPRG adjustability.	Optimized for portable USB-C PD sink applications; lacks programmable current limit and wide-VIN flexibility.	Prefer TPS61088RHLR for cost-sensitive, high-volume consumer designs where 5V output and small solution size outweigh design flexibility.

Compared with LT3957EDD#PBF and TPS61088RHLR, the LTC3872ETS8-1#TRPBF uniquely combines No RSENSE™ sensing, 550kHz fixed frequency, and TSOT-23-8 packaging - making it optimal for space-constrained, efficiency-critical 2A boost designs where external MOSFET selection and thermal management are prioritized.

Availability

LTC3872ETS8-1#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, IP phone power supplies, and 24V industrial controls requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LTC3872ETS8-1#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 acquired Linear Technology in 2017 and maintains its precision analog and power management portfolio. Linear pioneered high-performance DC/DC controllers with innovations like No RSENSE™ and proprietary current-mode architectures.

The LTC3872ETS8-1#TRPBF belongs to Linear's No RSENSE™ boost controller family, designed specifically for high-efficiency, low-component-count DC/DC conversion in space- and thermally constrained applications such as telecom infrastructure and industrial edge devices.

FAQ

What is the function of the IPRG pin on the LTC3872ETS8-1#TRPBF?

The IPRG pin on the LTC3872ETS8-1#TRPBF selects the peak current sense threshold: grounding it sets 105mV, leaving it floating sets 180mV, and connecting it to VIN sets 285mV. This adjusts the maximum allowable voltage drop across the external MOSFET's R_DS(ON), thereby defining the current limit without external components. The LTC3872ETS8-1#TRPBF uses this to calibrate inductor peak current based on the chosen MOSFET's on-resistance.

Does the LTC3872ETS8-1#TRPBF require an external current sense resistor?

No, the LTC3872ETS8-1#TRPBF implements Linear's No RSENSE™ architecture and senses current by monitoring the voltage drop across the external N-channel MOSFET's R_DS(ON). This eliminates the need for a discrete sense resistor, reducing power loss, board area, and component count. The LTC3872ETS8-1#TRPBF achieves this while maintaining ±1.5% output regulation and 550kHz fixed-frequency operation.

What is the maximum output voltage supported by the LTC3872ETS8-1#TRPBF?

The LTC3872ETS8-1#TRPBF supports output voltages up to 60V, as confirmed by its SW pin absolute maximum rating of –0.3V to 60V and its design for boost, SEPIC, and flyback topologies. This allows the LTC3872ETS8-1#TRPBF to generate 12V, 24V, or 48V rails from low-input sources like 3.3V or 5V, provided the external MOSFET and diode are rated accordingly.

How does the LTC3872ETS8-1#TRPBF handle light-load conditions?

The LTC3872ETS8-1#TRPBF employs pulse-skipping mode under light load, where the ITH pin voltage approaches 0.85V and the current comparator remains tripped, causing cycle skipping while maintaining regulation. This preserves low output ripple and high efficiency (<15µA quiescent current) at loads below 10mA - a key advantage of the LTC3872ETS8-1#TRPBF in always-on telecom and IP phone applications.

What package type is used for the LTC3872ETS8-1#TRPBF?

The LTC3872ETS8-1#TRPBF is packaged in an 8-lead TSOT-23 (Thin SOT-23) with 1mm profile and lead-free finish, marked as "LTCFN" in Linear's ordering matrix. Its thermal resistance is θ_JA = 195°C/W, requiring modest PCB copper area for thermal management. This package distinguishes the LTC3872ETS8-1#TRPBF from DFN variants like LTC3872EDDB-1#TRPBF and supports high-density layout in compact power modules.

LTC3872ETS8-1#TRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: SOT-23-8 Thin, TSOT-23-8

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Type:: Transistor Driver

Function:: Step-Up

Output Configuration:: Positive

Topology:: Boost

Number of Outputs:: 1

Output Phases:: 1

Voltage - Supply (Vcc/Vdd):: 2.75V ~ 9.8V

Frequency - Switching:: 550kHz

Duty Cycle (Max):: -

Synchronous Rectifier:: No

Clock Sync:: No

Serial Interfaces:: -

Control Features:: Current Limit, Enable, Soft Start

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TSOT-23-8

LTC3872ETS8-1#TRPBF FAQ

1.How can I place an order for LTC3872ETS8-1#TRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LTC3872ETS8-1#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 LTC3872ETS8-1#TRPBF reliable?

The price and inventory of LTC3872ETS8-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3872ETS8-1#TRPBF is usually 5 days.

3.What payment methods are accepted for LTC3872ETS8-1#TRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3872ETS8-1#TRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LTC3872ETS8-1#TRPBF?

LTC3872ETS8-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LTC3872ETS8-1#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 LTC3872ETS8-1#TRPBF?

For technical support, including LTC3872ETS8-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3872ETS8-1#TRPBF requirements.

6.How does Aetrix verify that LTC3872ETS8-1#TRPBF is sourced from the original manufacturer or authorized distributors?

All LTC3872ETS8-1#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 LTC3872ETS8-1#TRPBF meets industry standards.

7.What is the process for return or replacement of LTC3872ETS8-1#TRPBF?

All LTC3872ETS8-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3872ETS8-1#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 LTC3872ETS8-1#TRPBF part is unused and in its original packaging.

Return procedure for LTC3872ETS8-1#TRPBF:

1.Submit a request within 90 days.

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

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