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Analog Devices Inc. LTC3872ITS8#TRPBF
- Part No.:
- LTC3872ITS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC3872ITS8#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,036
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Product details
Overview
LTC3872ITS8#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% voltage accuracy, and supports 550kHz switching for compact inductor sizing - deployed in telecom power supplies and 42V automotive systems.
For engineers reviewing the LTC3872ITS8#TRPBF datasheet, LTC3872ITS8#TRPBF pinout, LTC3872ITS8#TRPBF application, or LTC3872ITS8#TRPBF equivalent, key selection considerations include No RSENSE™ current sensing architecture, IPRG-selectable peak current limit (65–290mV), internal soft-start, pulse-skipping at light load, and thermal performance in the –40°C to 125°C junction range.
Technical Context
The LTC3872ITS8#TRPBF implements a No RSENSE™ current-mode control loop that senses switch voltage drop across the external MOSFET's RDS(ON), eliminating discrete sense resistors and improving efficiency. Its 550kHz oscillator enables small magnetics, while internal slope compensation prevents subharmonic oscillation above 50% duty cycle.
It integrates undervoltage lockout (2.3V rising threshold), RUN/SS-controlled shutdown (8µA quiescent current), and a 1.2V reference with ±1.5% accuracy over temperature. The ITH pin serves as both error amplifier output and current limit threshold control point, directly linking regulation error to peak inductor current setting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.75V to 9.8V - supports single-cell Li-ion, 3.3V/5V rails, and automotive cold-crank conditions down to 2.75V. |
| Output Voltage Range | Up to 60V - enables high-voltage boost for telecom interfaces, LED drivers, and industrial sensors. |
| Switching Frequency | 550kHz typical - allows use of ≤1µH inductors, reducing board area and cost versus lower-frequency controllers. |
| Feedback Accuracy | ±1.5% over –40°C to 125°C - ensures stable regulation across automotive and industrial temperature extremes. |
| Peak Current Sense Threshold | 65mV to 290mV (IPRG-selectable) - sets precise MOSFET current limit without external resistor, enabling optimized FET sizing. |
| Shutdown Quiescent Current | 8µA typical - minimizes battery drain in always-on systems such as IP phones and remote sensors. |
| Junction Temperature Range | –40°C to 125°C - qualified for under-hood automotive and industrial control environments. |
Pinout & Package
Package: 8-lead TSOT-23 (ThinSOT™), 1mm height, exposed pad (GND). Thermal resistance θJA = 195°C/W. RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IPRG (Pin 1) | Current limit select input | Configures peak current threshold: GND = 65mV, float = 130mV, VIN = 215mV (LTC3872I grade) - sets MOSFET overcurrent protection level. |
| ITH (Pin 2) | Error amplifier output / compensation node | 0.7V–1.9V range controls current comparator threshold; connects to RC network for loop stability and soft-start timing. |
| VFB (Pin 3) | Feedback input | Monitors resistor divider output; regulates VOUT to 1.2V reference with ±1.5% accuracy - enables precise output programming. |
| GND (Pin 4) | Power and signal ground | Reference for all analog circuitry; exposed pad must be soldered to PCB ground plane for thermal and electrical integrity. |
| NGATE (Pin 5) | N-channel MOSFET gate driver | Drives external FET gate from 0V to VIN; 40ns rise/fall times support fast switching with low gate charge FETs. |
| VIN (Pin 6) | Main supply input | Powers internal circuitry; requires local 1µF ceramic decoupling to GND - sensitive to noise and ripple. |
| RUN/SS (Pin 7) | Enable and soft-start control | Below 0.85V disables IC (8µA IQ); capacitor on this pin provides controlled VITH ramp for inrush-limited startup. |
| SW (Pin 8) | Switch node / current sense input | Connects to MOSFET drain and inductor; senses switch voltage for No RSENSE™ current mode - rated to 60V max. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE™ current sensing | Eliminates external sense resistor, saving board space, reducing BOM count, and improving efficiency by avoiding I²R loss. |
| Adjustable peak current limit via IPRG | Three selectable thresholds (65/130/215mV for LTC3872I) enable precise MOSFET current rating matching without component changes. |
| Internal soft-start + optional external soft-start | Default 1ms internal ramp; external capacitor on RUN/SS enables user-defined startup time to prevent output overshoot and inrush stress. |
| Pulse-skipping at light load | Maintains regulation while reducing switching frequency and gate drive losses - improves light-load efficiency without audible noise. |
| 550kHz fixed-frequency operation | Enables consistent EMI profile and predictable filter design; supports compact 1µH inductors for space-constrained applications. |
Applications
| Telecom Power Supplies | 42V Automotive Systems |
|---|---|
|
Use Scenario: Generating 5V or 12V bias from 3.3V or 5V backplane rails in VoIP phones and base station line cards. IC Role / Device Role / Timing Role: Boost controller managing power conversion with tight output regulation and low-noise operation. Use Value: No RSENSE™ architecture avoids sense resistor heating and layout sensitivity, critical for dense telecom PCBs. |
Use Scenario: Providing stable 5V/12V from 12V or 24V vehicle batteries during cold-crank (down to 6V) or load-dump transients. IC Role / Device Role / Timing Role: High-efficiency boost controller supporting wide VIN range and robust thermal performance. Use Value: –40°C to 125°C operation and 2.75V UVLO ensure reliable startup and regulation in under-hood environments. |
| 24V Industrial Controls | IP Phone Power Supplies |
|
Use Scenario: Generating isolated or non-isolated 24V auxiliary rails from 12V fieldbus inputs in PLC I/O modules and motor drives. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller delivering precise output voltage with fast transient response. Use Value: ±1.5% feedback accuracy and excellent line/load regulation maintain sensor and actuator supply stability. |
Use Scenario: Converting PoE-derived 5V or 12V to higher voltages (e.g., 24V) for speaker amplifiers or ring generators in IP desk phones. IC Role / Device Role / Timing Role: Low-quiescent-current boost controller enabling always-on standby with minimal power draw. Use Value: 8µA shutdown IQ extends battery backup runtime; pulse-skipping maintains low noise during idle periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780EMS#PBF | Wide VIN (4–36V), synchronous dual-phase buck-boost; no No RSENSE™, requires external sense resistor. | Targets higher-power (>10A), bidirectional, or buck-boost topologies - not a direct replacement for simple boost. | Select only if topology flexibility and higher current capability outweigh added complexity and BOM cost. |
| TPS40210DRCT | TI part; 4.5–52V input, 1.5A integrated FET, fixed 600kHz; lacks IPRG adjustability and No RSENSE™ architecture. | Suitable for lower-current (<1.5A), cost-sensitive designs where integrated FET simplifies layout but limits voltage headroom. | Choose when integrated FET reduces footprint and cost is prioritized over efficiency and precision current limiting. |
Compared with LTC3872ITS8#TRPBF, LTC3780EMS#PBF offers broader topology support but adds design complexity and external sensing, while TPS40210DRCT trades No RSENSE™ efficiency and adjustable current limit for integration and lower system cost at reduced performance margins.
Availability
LTC3872ITS8#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, 42V automotive systems, and 24V industrial controls requiring stable component supply, extended temperature operation, and long-term production continuity.
Supply support for LTC3872ITS8#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 high-performance analog and power management portfolio. Linear's legacy emphasizes precision, reliability, and innovation in power conversion ICs.
The LTC3872ITS8#TRPBF belongs to Linear's No RSENSE™ boost controller family, designed specifically for high-efficiency, low-component-count DC/DC boost conversion in space- and thermal-constrained applications.
FAQ
What is the maximum output voltage supported by the LTC3872ITS8#TRPBF?
The LTC3872ITS8#TRPBF supports output voltages up to 60V, as confirmed by its SW pin absolute maximum rating and typical application circuits. This enables use in high-voltage boost applications such as telecom interface supplies and industrial sensor excitation, provided the external MOSFET and diode are rated accordingly. The controller itself does not regulate beyond the feedback divider's programmed value.
How does the No RSENSE™ architecture work in the LTC3872ITS8#TRPBF?
The LTC3872ITS8#TRPBF implements No RSENSE™ by sensing the voltage drop across the RDS(ON) of the external N-channel MOSFET via the SW pin. This eliminates the need for a discrete current-sense resistor, reducing power loss, board area, and thermal stress. The sensed voltage is compared against an IPRG-configurable threshold to enforce peak current limiting.
What is the operating temperature range for the LTC3872ITS8#TRPBF?
The LTC3872ITS8#TRPBF is specified for a junction temperature range of –40°C to 125°C, as indicated by the "I" grade suffix and confirmed in the Order Information table. This makes it suitable for under-hood automotive, industrial control, and telecom equipment where ambient temperatures exceed commercial-grade limits.
Can the LTC3872ITS8#TRPBF be used in SEPIC or flyback topologies?
Yes, the LTC3872ITS8#TRPBF is explicitly designed for boost, SEPIC, and flyback converter applications, as stated in the Functional Diagram and Applications Information sections. Its current-mode architecture and SW pin sensing capability support these topologies when configured with appropriate external components and transformer/isolation design.
What package type and thermal characteristics does the LTC3872ITS8#TRPBF have?
The LTC3872ITS8#TRPBF uses an 8-lead TSOT-23 (ThinSOT™) package with 1mm profile and exposed pad. Its thermal resistance is θJA = 195°C/W, requiring proper PCB copper area under the exposed pad for thermal management. This package enables high-density layouts while maintaining reliability in thermally demanding environments.
LTC3872ITS8#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LTC3872ITS8#TRPBF FAQ
1.How can I place an order for LTC3872ITS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3872ITS8#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 LTC3872ITS8#TRPBF reliable?
The price and inventory of LTC3872ITS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3872ITS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3872ITS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3872ITS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3872ITS8#TRPBF?
LTC3872ITS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3872ITS8#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 LTC3872ITS8#TRPBF?
For technical support, including LTC3872ITS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3872ITS8#TRPBF requirements.
6.How does Aetrix verify that LTC3872ITS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3872ITS8#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 LTC3872ITS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3872ITS8#TRPBF?
All LTC3872ITS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3872ITS8#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 LTC3872ITS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC3872ITS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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