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Analog Devices Inc. LTC3872ETS8#TRPBF
- Part No.:
- LTC3872ETS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC3872ETS8#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,301
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Product details
Overview
LTC3872ETS8#TRPBF 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% voltage accuracy, and supports 550kHz switching for compact inductor sizing-used in telecom power supplies and IP phone systems.
For engineers reviewing the LTC3872ETS8#TRPBF datasheet, LTC3872ETS8#TRPBF pinout, LTC3872ETS8#TRPBF application, or LTC3872ETS8#TRPBF equivalent, key selection criteria include No RSENSE operation, adjustable current limit via IPRG pin, internal soft-start, pulse-skipping at light load, and thermal performance in the TSOT-23-8 package with 195°C/W θJA.
Technical Context
The LTC3872ETS8#TRPBF 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 with duty-cycle-dependent frequency reduction above ~80% duty cycle to extend maximum output voltage capability. The RUN/SS pin provides shutdown control and optional external soft-start via capacitor charging by a 0.7µA current source, while UVLO disables operation below 2.3V input.
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 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. |
| Voltage Reference Accuracy | ±1.5% over temperature - ensures stable regulation across –40°C to 85°C operating range. |
| UVLO Threshold | 2.3V (rising), 2.05V (falling) - prevents erratic startup during brownout conditions. |
| Shutdown Current | 8µA typical - minimizes system standby power in battery-powered applications. |
| Package Thermal Resistance | θJA = 195°C/W (TSOT-23-8) - defines maximum power dissipation before junction overheating at given PCB layout. |
Pinout & Package
Package: 8-lead low-profile (1mm height) TSOT-23 (ThinSOT™), RoHS-compliant, lead-free finish, tape-and-reel packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IPRG (Pin 1) | Current limit select | Configures peak current threshold (65–290mV) by tying to GND, floating, or VIN - sets MOSFET conduction limit without external components. |
| ITH (Pin 2) | Error amplifier compensation node | 0.7V–1.9V range sets current comparator trip point; used for loop compensation and soft-start ramp control. |
| VFB (Pin 3) | Feedback input | Monitors resistor-divider output voltage; internal 1.2V reference enables precise output programming (e.g., 5V = 1.2V × (1 + R2/R1)). |
| 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-MOSFET gate driver output | Drives external N-channel MOSFET gate from 0V to VIN; rated for ±0.3V to (VIN + 0.3V) voltage swing. |
| VIN (Pin 6) | Main supply input | Powers internal circuitry; requires local 1µF ceramic decoupling to GND for noise immunity and stability. |
| RUN/SS (Pin 7) | Enable and soft-start control | Below 0.85V disables IC (8µA IQ); capacitor on this pin enables controlled VITH ramp-up for inrush current limiting. |
| SW (Pin 8) | Switch node interface | Connects to MOSFET drain and inductor; senses switch-node voltage for slope compensation and current sensing via RDS(ON). |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE current sensing | Eliminates external sense resistor, reducing BOM count, board space, and conduction losses - improves full-load efficiency by ~2–3% versus resistor-based designs. |
| Adjustable current limit | Three-level IPRG configuration (GND/floating/VIN) selects 65/130/225mV threshold - enables optimization for MOSFET RDS(ON) and output current requirements. |
| Internal soft-start + external option | 1ms default internal ramp plus RUN/SS capacitor support - prevents output overshoot and limits inrush into large output capacitors. |
| Pulse-skipping at light load | Maintains regulation while skipping cycles below ~10% load - reduces switching losses and improves light-load efficiency to >85% at 10mA. |
| High-frequency operation | 550kHz fixed-frequency PWM - permits use of 1µH–2.2µH inductors, cutting solution size by >40% vs 300kHz controllers. |
Applications
| Telecom Power Supplies | IP Phone Power Supplies |
|---|---|
Use Scenario: Generating isolated 48V or 54V bias rails from 3.3V or 5V backplane supplies in VoIP gateway hardware. IC Role / Device Role / Timing Role: Primary boost controller regulating output voltage using MOSFET RDS(ON) sensing and internal 1.2V reference. Use Value: Eliminates sense resistor loss and saves PCB area in space-constrained telecom modules while maintaining ±1.5% output accuracy over temperature. | Use Scenario: Providing regulated 5V or 12V from USB or PoE-derived 5V input to power Ethernet PHYs and audio codecs. IC Role / Device Role / Timing Role: Constant-frequency current-mode boost controller with pulse-skipping for dynamic load handling during call setup and voice transmission. Use Value: Achieves >90% efficiency at 2A load and maintains low output ripple (<20mVpp) due to 550kHz switching and internal slope compensation. |
| 42V Automotive Systems | 24V Industrial Controls |
Use Scenario: Boosting 12V battery rail to 24V or 42V for infotainment display backlight drivers or sensor excitation circuits. IC Role / Device Role / Timing Role: High-input-voltage-capable boost controller with UVLO set at 2.3V to survive cold-crank conditions down to 6V battery. Use Value: Supports wide input range (2.75–9.8V) and delivers stable output up to 60V - enables single-controller scalability across 12V/24V/42V vehicle architectures. | Use Scenario: Generating 5V logic supply and 15V op-amp rails from 24V industrial bus in PLC I/O modules. IC Role / Device Role / Timing Role: Current-mode DC/DC controller with excellent line regulation (0.14mV/V) and load regulation (±0.05%) for precision analog subsystems. Use Value: Maintains ±1.5% output accuracy across –40°C to 85°C ambient, ensuring reliable operation in uncooled factory-floor enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3958EMSE#TRPBF | Wider input range (2.8V–80V), integrated 5A MOSFET, higher max output (80V), but larger MSOP-16 package and no No RSENSE mode. | Used where higher integration and input surge tolerance are needed, e.g., LED drivers with 48V input. | Select when board space allows larger package and integrated FET simplifies layout - not drop-in compatible due to pinout and control architecture differences. |
| TPS40210DGQ | Fixed 500kHz frequency, external current sense resistor required, lower max output (36V), wider temp grade (–40°C to 125°C), SOIC-8 package. | Suitable for cost-sensitive industrial converters where sense resistor tolerance is acceptable. | Choose when design prioritizes TI's long-term availability and broader temp range over No RSENSE efficiency gain - requires redesign of current-sense network. |
Compared with LT3958EMSE#TRPBF and TPS40210DGQ, the LTC3872ETS8#TRPBF uniquely combines No RSENSE operation, 550kHz frequency, and TSOT-23-8 footprint - delivering highest power density and efficiency for medium-current (≤2A) boost applications where external MOSFET selection and thermal management are optimized.
Availability
LTC3872ETS8#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-lifecycle assurance, and RoHS-compliant packaging.
Supply support for LTC3872ETS8#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 product lines with rigorous characterization and long-term support.
The LTC3872ETS8#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 portable telecom and industrial edge devices.
FAQ
What is the maximum output voltage supported by the LTC3872ETS8#TRPBF?
The LTC3872ETS8#TRPBF supports output voltages up to 60V, as confirmed by its SW pin absolute maximum rating of –0.3V to 60V and validated in typical application circuits generating 5V, 12V, and 48V outputs. This enables use in telecom and industrial systems requiring boosted bus rails beyond standard logic levels.
Does the LTC3872ETS8#TRPBF require an external current sense resistor?
No, the LTC3872ETS8#TRPBF implements No RSENSE architecture that senses current through the RDS(ON) of the external N-channel MOSFET, eliminating the need for a discrete sense resistor. This is confirmed in the Features section, Functional Diagram, and Application Circuits - reducing component count, board area, and conduction losses.
What is the operating temperature range for the LTC3872ETS8#TRPBF?
The LTC3872ETS8#TRPBF is specified for operation from –40°C to +85°C (E-grade), as stated in the Order Information table and confirmed in Electrical Characteristics notes. Its junction temperature limit is 150°C, and thermal design must account for θJA = 195°C/W in the TSOT-23-8 package.
How does the IPRG pin affect current limiting on the LTC3872ETS8#TRPBF?
The IPRG pin on the LTC3872ETS8#TRPBF selects one of three peak current thresholds: 65mV (IPRG = GND), 130mV (IPRG = floating), or 225mV (IPRG = VIN). These values are specified in the Electrical Characteristics table and directly determine the maximum MOSFET conduction current based on RDS(ON), enabling precise overcurrent protection tuning.
Can the LTC3872ETS8#TRPBF be used in SEPIC or flyback topologies?
Yes, the LTC3872ETS8#TRPBF is explicitly qualified for SEPIC and flyback converter applications per the Main Control Loop description on page 7 of the datasheet. Its current-mode architecture and SW pin functionality support these non-isolated and isolated configurations - though external transformer or coupled inductor design and compensation differ from boost implementations.
LTC3872ETS8#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#TRPBF FAQ
1.How can I place an order for LTC3872ETS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3872ETS8#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#TRPBF reliable?
The price and inventory of LTC3872ETS8#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3872ETS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3872ETS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3872ETS8#TRPBF?
LTC3872ETS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3872ETS8#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#TRPBF?
For technical support, including LTC3872ETS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3872ETS8#TRPBF requirements.
6.How does Aetrix verify that LTC3872ETS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3872ETS8#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3872ETS8#TRPBF?
All LTC3872ETS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3872ETS8#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3872ETS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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