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Analog Devices Inc. LTC3872HDDB-1#TRPBF
- Part No.:
- LTC3872HDDB-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3872HDDB-1#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,929
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Product details
Overview
LTC3872HDDB-1#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 current-sense resistor. It operates from 2.75V to 9.8V input, delivers up to 60V output, achieves ±1.5% VOUT accuracy, and features 550kHz switching frequency for compact inductor sizing - used in telecom power supplies and 42V automotive systems.
For engineers reviewing the LTC3872HDDB-1#TRPBF datasheet, LTC3872HDDB-1#TRPBF pinout, LTC3872HDDB-1#TRPBF application, or LTC3872HDDB-1#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 compatibility with high-voltage MOSFET sensing in boost, SEPIC, and flyback topologies.
Technical Context
The LTC3872HDDB-1#TRPBF 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 constant-frequency 550kHz oscillator enables predictable EMI behavior and supports small magnetics.
It uses current-mode control with internal slope compensation to prevent subharmonic oscillation above 50% duty cycle, and integrates an error amplifier with ITH compensation node, undervoltage lockout (UVLO) at 2.3V (rising), and shutdown control via RUN/SS pin with 0.85V threshold.
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 cold-crank conditions down to 2.75V. |
| Output Voltage Range | Up to 60V - enables high-side sensing of MOSFET VDS in wide-output boost and SEPIC converters. |
| Switching Frequency | 550kHz (typ) - allows use of sub-2.2µH inductors and reduces size/cost of magnetic components. |
| Feedback Reference | 1.200V ±1.5% - ensures tight output regulation across temperature and line/load variations. |
| Junction Temp Range | –40°C to +150°C - qualified for under-hood automotive and industrial environments with high thermal stress. |
| Current Limit Accuracy | ±15mV over temp - peak current threshold varies by ≤±15mV across full operating range, enabling stable overload protection. |
| Gate Drive Rise/Fall Time | 40ns (CLOAD = 3000pF) - supports fast-switching MOSFETs while minimizing switching losses and shoot-through risk. |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN with exposed pad (Pin 9 = GND), θJA = 76°C/W, rated for –40°C to +150°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IPRG (Pin 1) | Current limit select | Configures peak current threshold: 80/145/240mV (H-grade) when tied to GND/FLOAT/VIN - sets MOSFET conduction time and overload protection level. |
| ITH (Pin 2) | Error amplifier output | Compensation node for loop stability; voltage (0.7–1.9V) sets current comparator threshold - critical for transient response tuning. |
| VFB (Pin 3) | Feedback input | Monitors resistor-divider output voltage; compares to 1.200V reference to regulate VOUT - enables remote sensing and precise output programming. |
| GND (Pin 4, Exposed Pad) | Power and signal ground | Primary return path for IC bias, gate drive, and feedback; exposed pad must be soldered to PCB ground plane for thermal and electrical integrity. |
| NGATE (Pin 5) | N-MOSFET gate driver | Drives external high-side N-channel MOSFET gate from 0V to VIN - requires Schottky clamping for negative voltage spike suppression. |
| VIN (Pin 6) | Supply input | Bias supply for internal circuitry; must be decoupled with ≥1µF ceramic capacitor close to pin - powers oscillator, reference, and gate driver. |
| RUN/SS (Pin 7) | Enable & soft-start | Shuts down IC below 0.85V; external capacitor enables controlled VITH ramp-up - prevents inrush current and output overshoot during startup. |
| SW (Pin 8) | Switch node interface | Connects to MOSFET drain and inductor; senses switch-node voltage for No RSENSE current detection - rated to 60V, requires low-inductance layout. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE current sensing | Eliminates external sense resistor, reducing BOM cost, board area, and conduction losses - improves efficiency by up to 3% in 3.3V→5V boost applications. |
| Adjustable current limit | Three preset thresholds (80/145/240mV) via IPRG pin - allows optimization of MOSFET SOA and short-circuit protection without changing external components. |
| Pulse-skipping at light load | Maintains regulation while skipping cycles below ~10% load - preserves constant-frequency operation, minimizes audible noise, and sustains >85% efficiency at 10mA output. |
| Internal soft-start | 1ms default ramp time - limits inrush current and controls VITH slew rate to prevent output overshoot during startup. |
| High-voltage SW pin | Rated to 60V - supports MOSFET-based current sensing in high-output boost (e.g., 12V→48V) and SEPIC converters without external level-shifting. |
Applications
| Telecom Power Supplies | 42V Automotive Systems |
|---|---|
Use Scenario: Generating isolated 5V/3.3V rails from 48V telecom backplane for base station control logic and interface ICs. IC Role / Device Role / Timing Role: Boost controller managing high-efficiency, low-noise DC/DC conversion with tight output regulation and fast load transient response. Use Value: Enables compact, high-density power modules meeting GR-63-CORE reliability standards due to 150°C rating and No RSENSE robustness. | Use Scenario: Providing stable 5V supply for engine control units (ECUs) and ADAS sensors during cold-crank (down to 2.75V battery). IC Role / Device Role / Timing Role: Primary boost regulator delivering regulated output despite wide input variation and high ambient temperature. Use Value: Ensures uninterrupted operation under under-hood thermal stress (150°C TJ) and maintains ±1.5% output accuracy across automotive temperature cycling. |
| 24V Industrial Controls | IP Phone Power Supplies |
Use Scenario: Stepping up 24V field bus voltage to 48V PoE-like rail for actuator drivers and isolation interfaces in factory automation. IC Role / Device Role / Timing Role: High-voltage boost controller supporting 60V output capability and robust MOSFET gate drive for industrial-grade reliability. Use Value: Reduces component count by eliminating sense resistor and simplifies thermal design with low θJA (76°C/W) DFN package. | Use Scenario: Converting 5V USB or PoE-derived input to 12V for IP phone speaker amplifiers and Ethernet PHYs. IC Role / Device Role / Timing Role: Constant-frequency boost controller ensuring low EMI and minimal conducted noise on shared communication lines. Use Value: 550kHz fixed frequency avoids interference with VoIP audio bands and enables small, low-profile magnetics for space-constrained desktop devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3872EDDB-1#TRPBF | Same pinout and functionality, but rated for –40°C to +85°C junction temperature. | Suitable for commercial/industrial indoor applications only; not qualified for under-hood or extended-temperature environments. | Select when thermal budget permits lower max TJ and cost sensitivity outweighs extended temperature need. |
| LTC3872IDDB-1#TRPBF | Same pinout and functionality, rated for –40°C to +125°C junction temperature. | Supports most automotive cabin and industrial control applications, but not under-hood or high-ambient scenarios requiring 150°C. | Choose for cost-optimized designs where 125°C TJ suffices and 150°C margin is unnecessary. |
Compared with LTC3872EDDB-1#TRPBF and LTC3872IDDB-1#TRPBF, the LTC3872HDDB-1#TRPBF provides the highest thermal operating ceiling (150°C), enabling deployment in extreme environments where sustained high junction temperatures would otherwise degrade performance or reliability - critical for engine bay, motor drive, and military-grade systems.
Availability
LTC3872HDDB-1#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, 42V automotive systems, and 24V industrial controls requiring stable component supply, long-term lifecycle support, and guaranteed high-temperature performance.
Supply support for LTC3872HDDB-1#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 precision analog and power management portfolio with rigorous qualification standards and long-term product roadmaps.
The LTC3872 family is designed as high-efficiency, high-voltage boost/SEPIC/flyback controllers targeting applications demanding No RSENSE simplicity, wide input/output ranges, and extended temperature operation - especially in automotive, industrial, and telecom infrastructure.
FAQ
What is the maximum output voltage supported by the LTC3872HDDB-1#TRPBF?
The LTC3872HDDB-1#TRPBF supports output voltages up to 60V, as confirmed by its SW pin absolute maximum rating of –0.3V to 60V and its design for MOSFET RDS(ON)-based current sensing in high-voltage boost and SEPIC topologies. This enables direct generation of 48V PoE, 54V telecom, and other high-side rails without additional level-shifting circuitry.
Does the LTC3872HDDB-1#TRPBF require an external current-sense resistor?
No, the LTC3872HDDB-1#TRPBF implements Linear's No RSENSE architecture and senses current by monitoring 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 BOM cost - a core feature validated across all LTC3872-1 variants including the H-grade LTC3872HDDB-1#TRPBF.
What is the operating junction temperature range for the LTC3872HDDB-1#TRPBF?
The LTC3872HDDB-1#TRPBF is specified for a junction temperature range of –40°C to +150°C, as documented in the "Order Information" table and confirmed by its H-grade marking (LTC3872Hxxx). This makes it suitable for under-hood automotive, industrial motor drives, and other high-thermal-stress applications where standard industrial-grade parts would fail.
How does the IPRG pin configure current limiting on the LTC3872HDDB-1#TRPBF?
The IPRG pin (Pin 1) on the LTC3872HDDB-1#TRPBF selects one of three peak current sense thresholds: 80mV (IPRG = GND), 145mV (IPRG = FLOAT), or 240mV (IPRG = VIN). These values are explicitly specified for the H-grade in the Electrical Characteristics table and determine the maximum MOSFET conduction time and overload protection point without external components.
Is the LTC3872HDDB-1#TRPBF pin-compatible with other LTC3872-1 variants in the DFN package?
Yes, the LTC3872HDDB-1#TRPBF shares identical pin configuration, pin functions, and footprint with all DFN-packaged LTC3872-1 variants (e.g., LTC3872EDDB-1#TRPBF, LTC3872IDDB-1#TRPBF), as confirmed by the unified "DDB PACKAGE" pin diagram and mechanical drawings in the datasheet - enabling drop-in replacement where thermal requirements allow.
LTC3872HDDB-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- 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:
- 8-DFN (3x2)
LTC3872HDDB-1#TRPBF FAQ
1.How can I place an order for LTC3872HDDB-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3872HDDB-1#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 LTC3872HDDB-1#TRPBF reliable?
The price and inventory of LTC3872HDDB-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3872HDDB-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3872HDDB-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3872HDDB-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3872HDDB-1#TRPBF?
LTC3872HDDB-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3872HDDB-1#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 LTC3872HDDB-1#TRPBF?
For technical support, including LTC3872HDDB-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3872HDDB-1#TRPBF requirements.
6.How does Aetrix verify that LTC3872HDDB-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3872HDDB-1#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 LTC3872HDDB-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3872HDDB-1#TRPBF?
All LTC3872HDDB-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3872HDDB-1#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 LTC3872HDDB-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3872HDDB-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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