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Analog Devices Inc. LTC3872HTS8#TRPBF
- Part No.:
- LTC3872HTS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC3872HTS8#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,258
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Product details
Overview
LTC3872HTS8#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% output voltage accuracy, and supports 550kHz switching for compact inductor sizing - used in telecom power supplies and 42V automotive systems.
For engineers reviewing the LTC3872HTS8#TRPBF datasheet, LTC3872HTS8#TRPBF pinout, LTC3872HTS8#TRPBF application, or LTC3872HTS8#TRPBF 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#TRPBF implements a No RSENSE current-sensing architecture that monitors the 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 the 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 NGATE drives the MOSFET gate with 40ns rise/fall times into 3000pF.
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/12V intermediate bus inputs. |
| Output Voltage Range | Up to 60V - enables high-voltage boost for telecom and industrial applications without external level-shifting. |
| Switching Frequency | 550kHz typical - allows use of sub-2.2µH inductors and reduces output filter size. |
| Output Voltage Accuracy | ±1.5% over temperature - ensures stable regulation for precision 5V or 12V auxiliary rails. |
| Junction Temperature Range | –40°C to 150°C - qualified for under-hood automotive and high-ambient industrial environments. |
| Current Limit Configuration | Adjustable via IPRG pin (GND/VIN/floating) - sets peak sense thresholds at 65/215/130mV for H-grade, enabling precise MOSFET RDS(ON)-based current limiting. |
| Shutdown Supply Current | 8µA typical - minimizes battery drain in always-on systems during standby. |
Pinout & Package
Package: 8-lead low-profile (1mm) TSOT-23 (ThinSOT™), RoHS-compliant, lead-free finish, thermal pad not present (unlike DFN variants).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IPRG (Pin 1) | Current limit select input | Configures peak current threshold: GND = 65mV, VIN = 215mV, float = 130mV - directly scales MOSFET conduction time. |
| ITH (Pin 2) | Error amplifier compensation node | 0.7V–1.9V range sets current comparator trip point; external RC network stabilizes loop dynamics. |
| VFB (Pin 3) | Feedback input | Monitors resistor-divider output voltage; internal 1.2V reference enables precise VO = 1.2V × (1 + R2/R1) programming. |
| GND (Pin 4) | Analog/digital ground | Reference for all internal circuitry; must be low-impedance connection to PCB ground plane. |
| NGATE (Pin 5) | N-MOSFET gate driver output | Drives external MOSFET gate from 0V to VIN; 40ns rise/fall into 3000pF ensures fast switching with minimal overlap loss. |
| VIN (Pin 6) | Power supply input | Bias supply for internal circuitry; requires local 1µF ceramic decoupling to GND. |
| RUN/SS (Pin 7) | Enable & soft-start control | <0.85V disables IC (8µA IQ); external capacitor 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. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE current sensing | Eliminates 5–15mΩ sense resistor, saving board space, reducing BOM cost, and improving full-load efficiency by 1–3%. |
| Internal soft-start + optional external | Fixed 1ms internal ramp; external capacitor on RUN/SS enables user-defined start-up time and inrush control. |
| Pulse-skipping at light load | Maintains regulation down to µA loads while preserving low output ripple and minimizing audible noise. |
| Undervoltage lockout (UVLO) | 2.3V rising threshold prevents erratic startup during brownout; hysteresis ensures clean enable/disable transitions. |
| High-temperature grade (H) | Guaranteed operation to 150°C junction temperature - suitable for engine-control modules and sealed industrial 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 power conversion with no external current sense resistor, reducing heat and footprint. Use Value: Enables compact, high-efficiency 5V output at 2A with <90% efficiency across load range - critical for dense telecom PCB layouts. | Use Scenario: Providing stable 5V microcontroller supply from vehicle battery (9V–16V nominal, up to 42V load dump). IC Role / Device Role / Timing Role: High-temp-rated boost controller regulating auxiliary rail despite under-hood ambient temperatures exceeding 125°C. Use Value: Delivers guaranteed operation up to 150°C junction temperature and withstands 42V transients - meets AEC-Q100 stress requirements. |
| 24V Industrial Controls | IP Phone Power Supplies |
Use Scenario: Stepping up 12V or 24V fieldbus supply to 48V PoE midspan or sensor excitation voltage in factory automation PLCs. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller supporting wide input range and precise output regulation under varying load conditions. Use Value: Achieves ±1.5% output accuracy and 550kHz operation - enables small magnetics and tight regulation for analog sensor interfaces. | Use Scenario: Converting 5V USB or PoE-derived power to regulated 5V/2A for VoIP phone processors and Ethernet PHYs. IC Role / Device Role / Timing Role: Low-quiescent-current boost controller with pulse-skipping mode for standby power optimization. Use Value: Reduces no-load input current to 8µA in shutdown and maintains low ripple during call signaling bursts. |
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 sense threshold (70mV @ IPRG=GND) vs. 65mV for H-grade. | Suitable for industrial controls but not under-hood automotive; reduced thermal margin at high ambient. | Select when operating ambient stays below 105°C and cost sensitivity outweighs extended temperature need. |
| MAX17595ATP+T | Higher 2MHz switching frequency; requires external current sense resistor; supports wider 4.5V–60V input range. | Better suited for ultra-compact designs needing >1MHz operation, but adds sense resistor and layout complexity. | Choose for space-constrained applications where 2MHz enables <1µH inductors, accepting added BOM and efficiency trade-offs. |
Compared with LTC3872ITS8#TRPBF, the LTC3872HTS8#TRPBF offers 25°C higher max junction temperature and tighter current limit tolerance, making it irreplaceable in thermally aggressive environments; versus MAX17595ATP+T, it trades higher frequency for No RSENSE simplicity and lower EMI, favoring reliability-critical over miniaturization-critical designs.
Availability
LTC3872HTS8#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, 42V automotive systems, and 24V industrial controls requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3872HTS8#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 power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3872 product line delivers robust, high-efficiency boost controllers optimized for space-constrained, thermally demanding applications where sense-resistor elimination improves reliability and efficiency.
FAQ
What is the maximum output voltage supported by the LTC3872HTS8#TRPBF?
The LTC3872HTS8#TRPBF 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 5V, 12V, and 48V outputs. This enables use in telecom and industrial applications requiring high-ratio step-up without cascaded stages.
Does the LTC3872HTS8#TRPBF require an external current sense resistor?
No, the LTC3872HTS8#TRPBF implements No RSENSE architecture that 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 validated across all LTC3872 family datasheets and application circuits.
What is the operating temperature range for the LTC3872HTS8#TRPBF?
The LTC3872HTS8#TRPBF is specified for a junction temperature range of –40°C to 150°C, with thermal performance characterized using θJA = 195°C/W for the TS8 package. This H-grade rating is explicitly listed in the Order Information table and confirmed in Note 2 of the datasheet for full-range guaranteed operation.
How does the IPRG pin affect current limiting on the LTC3872HTS8#TRPBF?
The IPRG pin on the LTC3872HTS8#TRPBF selects the peak current sense threshold: 65mV when tied to GND, 215mV when tied to VIN, and 130mV when left floating. These values are specified for the H-grade variant in the Electrical Characteristics table and directly determine the maximum inductor current before cycle-by-cycle limiting activates.
Can the LTC3872HTS8#TRPBF be used in SEPIC or flyback topologies?
Yes, the LTC3872HTS8#TRPBF is explicitly designed for boost, SEPIC, and flyback converter applications, as stated in the "Main Control Loop" section (page 7) and functional diagram. Its current-mode architecture and SW pin functionality support all three topologies - though external component selection (e.g., transformer turns ratio, coupling capacitor value) must match the chosen configuration.
LTC3872HTS8#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LTC3872HTS8#TRPBF FAQ
1.How can I place an order for LTC3872HTS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3872HTS8#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 LTC3872HTS8#TRPBF reliable?
The price and inventory of LTC3872HTS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3872HTS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3872HTS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3872HTS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3872HTS8#TRPBF?
LTC3872HTS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3872HTS8#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 LTC3872HTS8#TRPBF?
For technical support, including LTC3872HTS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3872HTS8#TRPBF requirements.
6.How does Aetrix verify that LTC3872HTS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3872HTS8#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 LTC3872HTS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3872HTS8#TRPBF?
All LTC3872HTS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3872HTS8#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 LTC3872HTS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC3872HTS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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