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Analog Devices Inc. LTC3872ITS8-1#TRMPBF
- Part No.:
- LTC3872ITS8-1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC3872ITS8-1#TRMPBF.pdf
- Description:
- IC REG CTRLR BOOST TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:393
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Product details
Overview
LTC3872ITS8-1#TRMPBF from Analog Devices (formerly Linear Technology) is a constant-frequency current-mode boost DC/DC 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 features 550kHz switching frequency for compact inductor sizing - used in telecom power supplies and IP phone power conversion.
For engineers reviewing the LTC3872ITS8-1#TRMPBF datasheet, LTC3872ITS8-1#TRMPBF pinout, LTC3872ITS8-1#TRMPBF application, or LTC3872ITS8-1#TRMPBF equivalent, key selection criteria include No RSENSE operation, adjustable current limit via IPRG pin, internal soft-start, pulse-skipping at light load, and –40°C to 125°C junction temperature rating.
Technical Context
The LTC3872ITS8-1#TRMPBF implements a No RSENSE architecture that senses current through the MOSFET's RDS(ON), eliminating external 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.
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 VIN. Unlike the standard LTC3872, this variant omits frequency foldback during current limit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.75V to 9.8V - supports single-cell Li-ion, 3.3V/5V logic rails, and automotive 12V-derived inputs. |
| Output Voltage Range | Up to 60V - enables high-voltage boost for telecom and industrial bus generation. |
| Switching Frequency | 550kHz typical - allows use of sub-2.2µH inductors and reduces output filter size. |
| Feedback Accuracy | ±1.5% over temperature - ensures stable regulation across –40°C to 125°C operating range. |
| UVLO Threshold | 2.3V (rising), 2.05V (falling) - prevents erratic startup during brownout conditions. |
| Shutdown Current | 8µA typical - minimizes battery drain in always-on systems. |
| Current Sense Method | No RSENSE via MOSFET RDS(ON) - eliminates power loss and board space for sense resistor. |
Pinout & Package
Package: 8-lead low-profile (1mm height) TSOT-23 (ThinSOT™), rated for –40°C to 125°C junction temperature, θJA = 195°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IPRG (Pin 1) | Current limit select | Configures peak current threshold (85–310mV) by tying to GND, floating, or VIN. |
| ITH (Pin 2) | Error amplifier compensation node | Carries loop compensation signal; voltage sets current comparator trip point. |
| VFB (Pin 3) | Feedback input | Monitors divided output voltage; compares to 1.2V internal reference for regulation. |
| GND (Pin 4) | Power and signal ground | Reference for all analog circuitry; exposed pad must be soldered for thermal performance. |
| SW (Pin 5) | Switch node / internal sense input | Connects to MOSFET drain and inductor; senses switch voltage for No RSENSE current detection. |
| RUN/SS (Pin 6) | Enable and soft-start control | Pull below 0.85V to shut down; capacitor here enables controlled VITH ramp-up. |
| VIN (Pin 7) | Supply input | Power source for internal circuitry; requires local 1µF ceramic decoupling. |
| NGATE (Pin 8) | N-MOSFET gate driver | Drives external MOSFET gate from 0V to VIN; rise/fall time ≤40ns into 3000pF. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE current sensing | Eliminates external sense resistor, reducing BOM count, power loss, and PCB area while enabling MOSFET-based current detection up to 60V. |
| Adjustable current limit | Three preset thresholds (GND/floating/VIN on IPRG) allow optimization for different MOSFET RDS(ON) and load requirements. |
| Internal soft-start + optional external | Default 1ms internal ramp; external capacitor on RUN/SS enables user-defined start-up time and inrush control. |
| Pulse-skipping at light load | Maintains regulation with cycle skipping below ~10% load, preserving high efficiency and low output ripple without audible noise. |
| 550kHz fixed-frequency operation | Enables small magnetics and predictable EMI profile; no frequency foldback avoids increased ripple at current limit. |
Applications
| Telecom Power Supplies | IP Phone Power Supplies |
|---|---|
Use Scenario: Generating isolated 48V or 54V bias from 3.3V or 5V backplane rails in VoIP gateway hardware. IC Role / Device Role / Timing Role: Primary boost controller managing MOSFET switching, current regulation, and output voltage stability. Use Value: No RSENSE architecture improves efficiency >92% at 1A load while minimizing heat and footprint in dense telecom modules. | Use Scenario: Providing regulated 5V or 12V from PoE-powered Ethernet ports to drive IP phone peripherals and audio codecs. IC Role / Device Role / Timing Role: High-efficiency non-isolated boost stage delivering clean, low-noise DC power with fast transient response. Use Value: Pulse-skipping mode maintains >85% efficiency down to 10mA load, extending standby runtime without compromising startup behavior. |
| 42V Automotive Systems | 24V Industrial Controls |
Use Scenario: Boosting nominal 12V battery voltage to 42V for legacy high-power lighting or actuator drivers in commercial vehicles. IC Role / Device Role / Timing Role: Robust DC/DC controller handling wide input transients (load dump, cold crank) and operating up to 125°C ambient. Use Value: –40°C to 125°C guaranteed operation and UVLO hysteresis ensure reliable startup and protection under harsh automotive thermal conditions. | Use Scenario: Converting 24V industrial bus to 36V or 48V for PLC I/O modules or sensor excitation circuits. IC Role / Device Role / Timing Role: Precision boost regulator with ±1.5% output accuracy and excellent line regulation for stable analog front-end biasing. Use Value: Internal 1.2V reference and low VFB input current (<50nA) minimize drift and loading errors in precision industrial applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3872ETS8-1#TRPBF | Same functionality but rated for 0°C to 85°C junction temperature; lower max operating temp than LTC3872ITS8-1#TRMPBF. | Suitable only for commercial-temperature environments; not qualified for extended industrial or automotive thermal profiles. | Select when ambient temperature stays below 85°C and cost sensitivity outweighs thermal margin needs. |
| LTC3872IDDB-1#TRPBF | Identical electrical specs and temperature grade (–40°C to 125°C), but in 2mm × 3mm DFN package with exposed thermal pad (θJA = 76°C/W). | Better thermal performance and higher power capability; requires different PCB layout and reflow profile. | Choose for higher-output-power designs where thermal dissipation is critical and DFN layout is acceptable. |
Compared with LTC3872ETS8-1#TRPBF, the LTC3872ITS8-1#TRMPBF offers extended temperature qualification essential for industrial deployment; compared with LTC3872IDDB-1#TRPBF, it trades thermal performance for smaller footprint and compatibility with legacy TSOT-23 layouts.
Availability
LTC3872ITS8-1#TRMPBF is available at Aetrix Electronics and suitable for telecom power supplies, IP phone power conversion, and 42V automotive systems requiring stable component supply, long-term lifecycle support, and guaranteed industrial-temperature operation.
Supply support for LTC3872ITS8-1#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 acquired Linear Technology in 2017 and maintains its portfolio of high-performance power management ICs with rigorous characterization and long-term product support.
The LTC3872 family is designed for high-efficiency, low-component-count boost, SEPIC, and flyback converters targeting space-constrained and thermally demanding applications in communications and industrial equipment.
FAQ
What is the maximum output voltage supported by the LTC3872ITS8-1#TRMPBF?
The LTC3872ITS8-1#TRMPBF supports output voltages up to 60V, as confirmed by its SW pin absolute maximum rating of –0.3V to 60V and design validation in boost configurations delivering 48V and 54V outputs. This enables use in telecom and industrial bus generation where higher intermediate rails are required beyond standard 5V or 12V levels.
Does the LTC3872ITS8-1#TRMPBF require an external current sense resistor?
No, the LTC3872ITS8-1#TRMPBF implements No RSENSE architecture and senses current through the RDS(ON) of the external N-channel MOSFET. This eliminates the need for a discrete sense resistor, reducing power loss, board area, and component count - a core feature validated across all LTC3872-1 variants including the LTC3872ITS8-1#TRMPBF.
What is the operating temperature range for the LTC3872ITS8-1#TRMPBF?
The LTC3872ITS8-1#TRMPBF is specified for a junction temperature range of –40°C to 125°C, as indicated by the "I" grade in its part number and confirmed in the Order Information table. This makes it suitable for industrial and extended-temperature automotive applications where ambient conditions exceed commercial-grade limits.
How does the IPRG pin affect current limiting on the LTC3872ITS8-1#TRMPBF?
The IPRG pin on the LTC3872ITS8-1#TRMPBF selects one of three peak current sense thresholds: 85mV (IPRG = GND), 150mV (IPRG = floating), or 250mV (IPRG = VIN). These values are specified per temperature grade and directly set the maximum MOSFET conduction time, enabling precise current limit tuning without external components.
Can the LTC3872ITS8-1#TRMPBF be used in SEPIC or flyback topologies?
Yes, the LTC3872ITS8-1#TRMPBF is explicitly qualified for SEPIC and flyback converter applications in addition to boost, as stated in the Functional Diagram section and Applications Information. Its No RSENSE current sensing, current-mode control, and flexible gate drive make it compatible with these non-isolated and isolated topologies when configured per Linear Technology's reference designs.
LTC3872ITS8-1#TRMPBF 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LTC3872ITS8-1#TRMPBF FAQ
1.How can I place an order for LTC3872ITS8-1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3872ITS8-1#TRMPBF 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 LTC3872ITS8-1#TRMPBF reliable?
The price and inventory of LTC3872ITS8-1#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3872ITS8-1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3872ITS8-1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3872ITS8-1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3872ITS8-1#TRMPBF?
LTC3872ITS8-1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3872ITS8-1#TRMPBF 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 LTC3872ITS8-1#TRMPBF?
For technical support, including LTC3872ITS8-1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3872ITS8-1#TRMPBF requirements.
6.How does Aetrix verify that LTC3872ITS8-1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3872ITS8-1#TRMPBF 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 LTC3872ITS8-1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3872ITS8-1#TRMPBF?
All LTC3872ITS8-1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3872ITS8-1#TRMPBF, 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 LTC3872ITS8-1#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3872ITS8-1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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