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Analog Devices Inc. LTC3872HTS8#TRMPBF
- Part No.:
- LTC3872HTS8#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC3872HTS8#TRMPBF.pdf
- Description:
- IC REG CTRLR BOOST TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:492
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Product details
Overview
LTC3872HTS8#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% voltage accuracy, and supports 550kHz switching for compact inductor sizing-used in telecom power supplies, 42V automotive systems, and IP phone power rails.
For engineers reviewing the LTC3872HTS8#TRMPBF datasheet, LTC3872HTS8#TRMPBF pinout, LTC3872HTS8#TRMPBF application, or LTC3872HTS8#TRMPBF equivalent, key selection criteria include its No RSENSE architecture, –40°C to 150°C junction temperature rating, adjustable current limit via IPRG pin, internal soft-start, and pulse-skipping light-load operation.
Technical Context
The LTC3872HTS8#TRMPBF implements a No RSENSE current sensing architecture that monitors voltage drop across the external MOSFET's RDS(ON), eliminating discrete 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 maintain minimum off-time, supports internal and external soft-start via RUN/SS, and includes undervoltage lockout (UVLO) with 2.3V rising threshold and 2.05V falling threshold.
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 industrial inputs. |
| Output Voltage Range | Up to 60V - enables high-ratio boost for telecom and automotive applications. |
| Switching Frequency | 550kHz typical - allows use of small, low-profile inductors (e.g., 1µH) and reduces output ripple. |
| Feedback Accuracy | ±1.5% over –40°C to 150°C - ensures stable regulation across extended automotive and industrial thermal environments. |
| Current Limit Threshold | 65–290mV selectable via IPRG pin - provides design flexibility for MOSFET RDS(ON)-based current sensing. |
| Junction Temperature Range | –40°C to 150°C - qualified for under-hood automotive and high-ambient industrial deployments. |
| Shutdown Supply Current | 8µA typical - minimizes battery drain in always-on systems during standby. |
Pinout & Package
Package: 8-lead TSOT-23 (ThinSOT™), 1mm profile, lead-free finish, exposed pad soldered to GND for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IPRG (Pin 1) | Current limit select input | Configures peak current threshold (65/130/215mV for H-grade) by tying to GND, float, or VIN. |
| ITH (Pin 2) | Error amplifier compensation node | 0.7V–1.9V range sets current comparator threshold; used for loop compensation and soft-start ramp control. |
| VFB (Pin 3) | Feedback input | Monitors resistor-divider output voltage; referenced to 1.2V internal bandgap for ±1.5% regulation accuracy. |
| GND (Pin 4) | Power and signal ground | Reference for all analog circuitry; exposed pad must be soldered to PCB ground plane for thermal dissipation (θJA = 195°C/W). |
| NGATE (Pin 5) | N-MOSFET gate driver output | Swings 0V to VIN; drives external high-side N-channel switch with 40ns rise/fall times into 3000pF load. |
| VIN (Pin 6) | Supply input | Power source for internal circuitry; requires local 10µF ceramic decoupling to GND. |
| RUN/SS (Pin 7) | Enable and soft-start control | Below 0.85V disables IC (8µA IQ); capacitor on this pin enables linear soft-start via 0.7µA internal current source. |
| SW (Pin 8) | Switch node interface | Connects to MOSFET drain and inductor; rated to 60V; serves as internal current sense input when using MOSFET RDS(ON). |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE current sensing | Eliminates external sense resistor, reducing BOM count, board area, and conduction losses in high-current boost designs. |
| Adjustable current limit | Three thresholds (GND/floating/VIN on IPRG) allow precise MOSFET current limiting without trimming resistors. |
| Pulse-skipping at light load | Maintains regulation while reducing switching frequency and quiescent current, improving efficiency below ~10% load. |
| Internal soft-start + optional external | Prevents inrush current and output overshoot; external capacitor on RUN/SS enables user-defined start-up time. |
| High-temperature grade (H) | Guaranteed operation from –40°C to 150°C junction temperature - suitable for engine compartment and industrial control enclosures. |
Applications
| Telecom Power Supplies | 42V Automotive Systems |
|---|---|
Use Scenario: Generating isolated 5V/12V bias rails from 3.3V or 5V backplane supplies in optical line cards and base station RF modules. IC Role / Device Role / Timing Role: Boost controller managing high-efficiency, low-noise power conversion with minimal external components. Use Value: No RSENSE architecture avoids sense resistor power loss and thermal derating issues common in dense telecom PCB layouts. | Use Scenario: Providing stable 5V/12V power to infotainment ECUs and ADAS sensors in vehicles with 12V/42V dual-battery architectures. IC Role / Device Role / Timing Role: High-temp-rated boost controller delivering regulated output despite under-hood ambient temperatures up to 125°C. Use Value: 150°C junction rating and UVLO with hysteresis ensure reliable startup and shutdown during cold cranking and load dump events. |
| 24V Industrial Controls | IP Phone Power Supplies |
Use Scenario: Stepping up 24V DC bus to 48V PoE midspan or auxiliary 36V rails for PLC I/O modules and motor drivers. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller enabling predictable EMI filtering and robust load transient response. Use Value: 550kHz operation allows compact magnetics and tight output regulation (±1.5%) across wide input and load variations. | Use Scenario: Converting 5V USB or PoE-derived input to regulated 5V/3.3V for VoIP handset processors, codecs, and Ethernet PHYs. IC Role / Device Role / Timing Role: Low-quiescent-current boost controller supporting always-on standby and rapid wake-up. Use Value: 8µA shutdown current and pulse-skipping light-load mode extend battery backup runtime in enterprise IP phones. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3872ITS8#TRPBF | Rated for –40°C to 125°C junction temperature; lower max current sense thresholds (70/135/225mV) vs. H-grade (65/130/215mV). | Suitable for commercial/industrial environments but not under-hood automotive or high-ambient industrial enclosures. | Select only if full 150°C operation is unnecessary and cost optimization is prioritized. |
| LT3958IS#TRPBF | Wider input range (2.8V–80V), higher output capability (up to 80V), integrated boost diode driver, but larger 20-pin TSSOP package. | Used where higher output voltage, integrated diode drive, or wider VIN range is required - not pin-compatible. | Choose when scaling beyond 60V output or needing enhanced fault protection features unavailable in LTC3872. |
Compared with LTC3872ITS8#TRPBF, the LTC3872HTS8#TRMPBF offers extended thermal qualification critical for harsh environments, while LT3958IS#TRPBF trades pin compatibility for higher voltage capability and integrated functionality - neither is a drop-in replacement.
Availability
LTC3872HTS8#TRMPBF is available at Aetrix Electronics and suitable for telecom power supplies, 42V automotive systems, and 24V industrial controls requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3872HTS8#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 high-performance analog and power management product lines with rigorous qualification standards.
The LTC3872HTS8#TRMPBF belongs to Linear's No RSENSE boost controller family, designed specifically for high-efficiency, low-component-count DC/DC boost conversion in space-constrained and thermally demanding applications.
FAQ
What is the maximum output voltage supported by the LTC3872HTS8#TRMPBF?
The LTC3872HTS8#TRMPBF 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. This enables use in telecom, industrial, and automotive boost applications where high-ratio conversion is required without cascading stages.
Does the LTC3872HTS8#TRMPBF require an external current sense resistor?
No, the LTC3872HTS8#TRMPBF implements No RSENSE architecture and senses current via the voltage drop across the external N-channel MOSFET's RDS(ON). This eliminates the need for a discrete sense resistor, reducing power loss, board area, and component count - a core feature confirmed across all LTC3872 datasheet sections and functional diagrams.
What is the operating temperature range of the LTC3872HTS8#TRMPBF?
The LTC3872HTS8#TRMPBF is specified for a junction temperature range of –40°C to 150°C, as explicitly stated in the Order Information table and Electrical Characteristics notes. This H-grade qualification makes it suitable for under-hood automotive, industrial control, and high-ambient-temperature deployments where standard industrial-grade variants would fail.
How does the IPRG pin affect current limiting on the LTC3872HTS8#TRMPBF?
The IPRG pin on the LTC3872HTS8#TRMPBF selects the peak current sense threshold: 65mV (IPRG = GND), 130mV (IPRG = floating), or 215mV (IPRG = VIN) for the H-grade device. These values are documented in the Electrical Characteristics table and directly determine the maximum inductor current before cycle-by-cycle current limiting activates.
Can the LTC3872HTS8#TRMPBF be used in SEPIC or flyback topologies?
Yes, the LTC3872HTS8#TRMPBF is explicitly specified for boost, SEPIC, and flyback converter applications per its datasheet Description and Main Control Loop section. Its current-mode architecture and SW pin functionality support all three topologies - though external component selection (e.g., transformer turns ratio, coupling capacitor) must match the chosen topology's requirements.
LTC3872HTS8#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LTC3872HTS8#TRMPBF FAQ
1.How can I place an order for LTC3872HTS8#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3872HTS8#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 LTC3872HTS8#TRMPBF reliable?
The price and inventory of LTC3872HTS8#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3872HTS8#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3872HTS8#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3872HTS8#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3872HTS8#TRMPBF?
LTC3872HTS8#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3872HTS8#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 LTC3872HTS8#TRMPBF?
For technical support, including LTC3872HTS8#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3872HTS8#TRMPBF requirements.
6.How does Aetrix verify that LTC3872HTS8#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3872HTS8#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 LTC3872HTS8#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3872HTS8#TRMPBF?
All LTC3872HTS8#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3872HTS8#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 LTC3872HTS8#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3872HTS8#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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