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Analog Devices Inc. LTC3872HDDB#TRPBF
- Part No.:
- LTC3872HDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3872HDDB#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,788
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Product details
Overview
LTC3872HDDB#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 42V automotive systems.
For engineers reviewing the LTC3872HDDB#TRPBF datasheet, LTC3872HDDB#TRPBF pinout, LTC3872HDDB#TRPBF application, or LTC3872HDDB#TRPBF equivalent, key selection criteria include its No RSENSE architecture, 550kHz fixed-frequency operation, –40°C to 150°C junction temperature rating, DFN-8 (3mm × 2mm) package with exposed thermal pad, and adjustable current limit via IPRG pin configuration.
Technical Context
The LTC3872HDDB#TRPBF implements a No RSENSE current sensing architecture that measures voltage drop across the MOSFET's RDS(ON) instead of using an external sense resistor-reducing component count, improving efficiency, and enabling high-voltage output capability up to 60V. Its internal slope compensation ensures stable current-mode operation above 50% duty cycle.
It integrates a 1.2V reference with ±1.5% accuracy, undervoltage lockout at 2.3V (rising), shutdown control via RUN/SS pin with 0.85V threshold, and internal soft-start with 1ms default timing. The ITH pin serves as the error amplifier output and current limit threshold control node, directly linking feedback regulation to peak current limiting.
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 24V industrial inputs with headroom for transients. |
| Output Voltage Range | Up to 60V - enables high-side bias generation, PoE midspan, and automotive 42V system interfaces. |
| Switching Frequency | 550kHz typical - allows use of sub-2.2µH inductors and reduces output capacitor RMS ripple requirements. |
| Feedback Accuracy | ±1.5% over temperature - ensures tight regulation for sensitive analog or RF circuitry powered from boosted rail. |
| Junction Temp Range | –40°C to 150°C - qualified for under-hood automotive and industrial environments without derating. |
| Current Sense Method | No RSENSE (MOSFET RDS(ON) sensing) - eliminates sense resistor losses, saves PCB area, and avoids parasitic inductance issues. |
| Package Thermal Resistance | θJA = 76°C/W - exposed pad must be soldered to PCB ground plane to achieve rated thermal performance. |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN with exposed thermal pad (Pin 9 = GND). Requires soldering of exposed pad to PCB ground for electrical integrity and thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IPRG (Pin 1) | Current limit select input | Configures peak current threshold: GND = 65mV, float = 130mV, VIN = 215mV - sets MOSFET conduction limit without external components. |
| ITH (Pin 2) | Error amplifier output / compensation node | 0.7V–1.9V range sets current comparator threshold; connects to RC network for loop stability and transient response tuning. |
| VFB (Pin 3) | Feedback input | Monitors resistor divider output; internal 1.2V reference enables precise VO programming (e.g., VO = 1.2V × (1 + R2/R1)). |
| GND (Pin 4, Exposed Pad) | Power and signal ground | Primary return path for all currents; exposed pad must be soldered to PCB ground plane for thermal and EMI performance. |
| NGATE (Pin 5) | N-MOSFET gate driver output | Drives external N-channel MOSFET gate from 0V to VIN; slew rate optimized for low EMI and minimal shoot-through risk. |
| VIN (Pin 6) | Supply input | Powers internal circuitry; requires local 1µF ceramic decoupling to GND within 2mm of pin. |
| RUN/SS (Pin 7) | Enable and soft-start control | Below 0.85V = shutdown (8µA IQ); capacitor on this pin provides controlled VITH ramp for inrush current limiting. |
| SW (Pin 8) | Switch node interface | Connects to MOSFET drain and inductor; senses switch voltage for No RSENSE current detection; rated to 60V. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE current sensing | Eliminates external sense resistor, reducing BOM cost, board space, and conduction losses - critical for high-efficiency portable and automotive designs. |
| 550kHz fixed-frequency operation | Enables consistent EMI filtering design and small magnetics; frequency shifts only near 80% duty cycle to maintain minimum off-time. |
| Adjustable current limit via IPRG | Three discrete thresholds (65/130/215mV) allow optimization of MOSFET SOA without trimming resistors or redesigning layout. |
| Internal soft-start + optional external | 1ms default internal ramp prevents output overshoot; external capacitor adds programmable start-up time and inrush control for capacitive loads. |
| –40°C to 150°C guaranteed operation | Full specification over extended temperature range eliminates need for derating or thermal margin assumptions in harsh environments. |
Applications
| Telecom Power Supplies | 42V Automotive Systems |
|---|---|
Use Scenario: Generating 5V/2A bias rail from 3.3V backplane in IP phone or small cell base station. IC Role / Device Role / Timing Role: Boost controller managing power conversion, current regulation, and transient response without sense resistor. Use Value: Achieves >90% efficiency at full load while minimizing heat rise and PCB footprint-critical for fanless telecom enclosures. | Use Scenario: Providing regulated 12V supply from 12V nominal (9–16V) or 42V nominal (36–58V) battery in ADAS camera module. IC Role / Device Role / Timing Role: High-reliability boost controller delivering stable output despite wide input variation and engine cranking dips. Use Value: UVLO at 2.3V and 150°C junction rating ensure continuous operation during cold-crank events and under-hood thermal stress. |
| 24V Industrial Controls | IP Phone Power Supplies |
Use Scenario: Stepping up 24V field bus to 48V for PoE-powered sensors or actuators in factory automation. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller enabling predictable EMI profile and robust line/load regulation. Use Value: 550kHz switching allows compact 1.8µH inductor and ceramic output caps-reducing size vs. lower-frequency alternatives. | Use Scenario: Converting 5V USB power to isolated 48V phantom power for VoIP handsets with low acoustic noise. IC Role / Device Role / Timing Role: Low-noise boost controller supporting pulse-skipping at light load to maintain high efficiency down to 1mA. Use Value: Eliminates audible coil whine and reduces standby power to <10µA in shutdown-meeting ENERGY STAR requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3872EDDB#TRPBF | Same silicon, rated for –40°C to 85°C junction temperature; lower θJA not applicable due to identical DFN-8 package construction. | Suitable for commercial/industrial ambient environments only; not qualified for under-hood or extended-temperature industrial use. | Select when full 150°C operation is unnecessary and cost sensitivity favors standard-grade variant. |
| LTC3872IDDB#TRPBF | Same silicon, rated for –40°C to 125°C junction temperature; shares identical electrical specs and pinout. | Valid for most automotive cabin and industrial control applications but lacks AEC-Q100 qualification or 150°C margin. | Choose for cost-optimized designs where 125°C max junction suffices and thermal headroom is constrained. |
Compared with LTC3872EDDB#TRPBF and LTC3872IDDB#TRPBF, the LTC3872HDDB#TRPBF provides guaranteed operation up to 150°C junction temperature-enabling deployment in high-ambient locations like engine compartments or sealed industrial enclosures without thermal derating or forced cooling.
Availability
LTC3872HDDB#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, 42V automotive systems, and 24V industrial controls requiring stable component supply across long product lifecycles and high-reliability deployments.
Supply support for LTC3872HDDB#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 full technical and manufacturing continuity for the LTC portfolio. Linear's legacy expertise in precision analog and power management remains core to ADI's high-performance power solutions.
The LTC3872HDDB#TRPBF belongs to the LTC3872 family of No RSENSE boost controllers designed specifically for high-efficiency, low-component-count DC/DC conversion in space-constrained and thermally demanding applications.
FAQ
What is the maximum output voltage supported by the LTC3872HDDB#TRPBF?
The LTC3872HDDB#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 driving 5V-to-60V boost stages. This enables use in PoE midspan, industrial sensor biasing, and 42V automotive subsystems without external level-shifting circuitry.
Does the LTC3872HDDB#TRPBF require an external current sense resistor?
No, the LTC3872HDDB#TRPBF uses No RSENSE architecture to sense current via the voltage drop across the external N-channel MOSFET's RDS(ON), eliminating the need for a discrete sense resistor. This reduces power loss, board area, and parasitic inductance-verified in Figures 1 and 2 of the official datasheet.
What is the operating temperature range of the LTC3872HDDB#TRPBF?
The LTC3872HDDB#TRPBF is specified for a junction temperature range of –40°C to 150°C, making it suitable for under-hood automotive, industrial control, and telecom infrastructure applications. This rating is explicitly stated in the Order Information table and confirmed in Note 2 of the Electrical Characteristics section.
How does the IPRG pin configure current limiting on the LTC3872HDDB#TRPBF?
The IPRG pin on the LTC3872HDDB#TRPBF selects one of three peak current sense thresholds: tied to GND (65mV), left floating (130mV), or tied to VIN (215mV)-corresponding to different MOSFET RDS(ON) ranges. These values are specified in the Electrical Characteristics table for the H-grade device and enable precise current limiting without external components.
What package type and thermal requirements apply to the LTC3872HDDB#TRPBF?
The LTC3872HDDB#TRPBF uses an 8-lead 3mm × 2mm plastic DFN package with exposed thermal pad (Pin 9). The datasheet mandates soldering the exposed pad to PCB ground for both electrical reference and thermal performance, achieving θJA = 76°C/W-critical to sustaining 150°C junction operation under load.
LTC3872HDDB#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#TRPBF FAQ
1.How can I place an order for LTC3872HDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3872HDDB#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#TRPBF reliable?
The price and inventory of LTC3872HDDB#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3872HDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3872HDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3872HDDB#TRPBF?
LTC3872HDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3872HDDB#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#TRPBF?
For technical support, including LTC3872HDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3872HDDB#TRPBF requirements.
6.How does Aetrix verify that LTC3872HDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3872HDDB#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3872HDDB#TRPBF?
All LTC3872HDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3872HDDB#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3872HDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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