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Analog Devices Inc. LTC3872HDDB#TRMPBF
- Part No.:
- LTC3872HDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3872HDDB#TRMPBF.pdf
- Description:
- IC REG CTRLR BOOST 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,717
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Product details
Overview
LTC3872HDDB#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 and 42V automotive systems.
For engineers reviewing the LTC3872HDDB#TRMPBF datasheet, LTC3872HDDB#TRMPBF pinout, LTC3872HDDB#TRMPBF application, or LTC3872HDDB#TRMPBF equivalent, key selection criteria include its No RSENSE architecture, 150°C junction-rated DFN package, adjustable current limit via IPRG pin, internal soft-start, and pulse-skipping light-load operation.
Technical Context
The LTC3872HDDB#TRMPBF implements a No RSENSE current sensing architecture that measures 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 features a 550kHz oscillator with duty-cycle-dependent frequency reduction above ~80% duty cycle to extend maximum on-time, internal undervoltage lockout (UVLO) at 2.3V (rising), and RUN/SS pin supporting shutdown (8µA IQ) and external soft-start via capacitor charging at 0.7µA.
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 after regulation. |
| Output Voltage Range | Up to 60V - enables high-side bias generation and telecom -48V system interfaces. |
| Switching Frequency | 550kHz typical - allows use of sub-2.2µH inductors and reduces output filter size. |
| Voltage Reference Accuracy | ±1.5% over –40°C to 150°C - ensures stable output regulation across extended automotive temperature range. |
| Current Limit Configuration | Adjustable via IPRG pin (GND/FLOAT/VIN) - sets peak sense thresholds at 65/130/215mV (H-grade), enabling precise MOSFET RDS(ON)-based current limiting. |
| Shutdown Supply Current | 8µA typical - minimizes standby power in battery-backed or always-on systems. |
| Junction Temperature Range | –40°C to 150°C - qualified for under-hood automotive and industrial high-temperature environments. |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN with exposed pad (Pin 9 = GND), θJA = 76°C/W, rated for 150°C max junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IPRG (Pin 1) | Current limit select input | Configures peak current threshold (65/130/215mV) by tying to GND/FLOAT/VIN - directly scales MOSFET-based current sensing gain. |
| ITH (Pin 2) | Error amplifier compensation node | Carries transconductance amplifier output (0.7V–1.9V range); sets current comparator trip point and determines loop stability via external RC network. |
| VFB (Pin 3) | Feedback input | Monitors resistor-divider output voltage; compares to 1.2V internal reference to regulate VOUT with ±1.5% accuracy. |
| GND (Pin 4 + Exposed Pad) | Power and signal ground | Primary return path for IC core, gate drive, and feedback; exposed pad must be soldered for thermal performance and noise immunity. |
| NGATE (Pin 5) | N-MOSFET gate driver output | Drives external high-side N-channel MOSFET gate from 0V to VIN; 40ns rise/fall times support efficient 550kHz switching. |
| VIN (Pin 6) | Main supply input | Powers internal circuitry; requires local 1µF ceramic decoupling to GND to suppress switching noise. |
| RUN/SS (Pin 7) | Enable and soft-start control | Shuts down IC below 0.85V (8µA IQ); external capacitor enables controlled VITH ramp-up during startup to limit inrush current. |
| SW (Pin 8) | Switch node interface | Connects to MOSFET drain and inductor; senses switch-node voltage for slope compensation and No RSENSE current detection. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE current sensing | Eliminates external sense resistor, reducing BOM count, board area, and conduction losses - improves full-load efficiency by ~1.5% vs resistor-based designs. |
| 550kHz fixed-frequency operation | Enables use of 1µH–2.2µH shielded inductors, cutting solution size by >30% versus 300kHz controllers while maintaining low EMI. |
| Adjustable peak current limit | Three IPRG configurations allow optimization of current limit for specific MOSFET RDS(ON), balancing short-circuit protection margin and conduction loss. |
| 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. |
| Internal soft-start + optional external | Default 1ms internal ramp prevents output overshoot; external capacitor on RUN/SS enables user-defined start-up time (e.g., 10ms for sequencing-sensitive systems). |
Applications
| Telecom Power Supplies | 42V Automotive Systems |
|---|---|
Use Scenario: Generating isolated 5V/3.3V bias rails from -48V telecom backplane using SEPIC topology. IC Role / Device Role / Timing Role: Boost/SEPIC controller providing regulated output with No RSENSE sensing and 550kHz switching for compact magnetics. Use Value: Eliminates sense resistor heat and layout sensitivity, enabling reliable operation in high-density telecom line cards with minimal thermal derating. | Use Scenario: Boosting 12V battery rail to 24V/36V for ADAS camera modules and radar ECUs in engine compartments. IC Role / Device Role / Timing Role: High-temp DC/DC controller managing power conversion under hood with 150°C junction rating and UVLO at 2.3V. Use Value: Sustains operation during cold-crank (down to 2.75V) and hot ambient (150°C), avoiding brownouts in safety-critical vision systems. |
| 24V Industrial Controls | IP Phone Power Supplies |
Use Scenario: Converting 24V DC bus to 48V PoE midspan power sourcing equipment (PSE) interface. IC Role / Device Role / Timing Role: Constant-frequency boost controller delivering tightly regulated 48V with ±1.5% accuracy and pulse-skipping for standby mode. Use Value: Meets IEEE 802.3af/at voltage tolerance requirements while minimizing no-load power draw (<15mW) for energy-efficient PSE design. | Use Scenario: Providing 5V/2A auxiliary power from 3.3V logic supply in VoIP desk phones with space-constrained PCBs. IC Role / Device Role / Timing Role: Compact boost controller in 3mm × 2mm DFN driving low-RDS(ON) MOSFET for high-efficiency local conversion. Use Value: Achieves >92% peak efficiency at 2A with 1µH inductor, enabling full-feature IP phones in ultra-thin form factors. |
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 pinout and functionality, but rated for –40°C to 85°C junction temperature (vs. –40°C to 150°C for LTC3872HDDB#TRMPBF). | Suitable for commercial/industrial indoor applications; not qualified for under-hood automotive or high-temp industrial enclosures. | Select when ambient temperature stays below 85°C and cost sensitivity outweighs extended temp qualification. |
| LT3958EUFD#PBF | Higher integration: includes internal 4A MOSFET driver, wider VIN (4.5V–100V), programmable frequency (100kHz–1MHz), but larger 28-pin TSSOP package. | Supports higher-power boost (up to 100W) and buck-boost topologies; lacks No RSENSE architecture - requires external sense resistor. | Choose when higher output power, wider input range, or multi-topology flexibility is required, accepting added BOM cost and board area. |
Compared with LTC3872EDDB#TRPBF, the LTC3872HDDB#TRMPBF provides guaranteed operation up to 150°C junction temperature - critical for automotive under-hood placement - while matching all electrical specs. Versus LT3958EUFD#PBF, it trades integrated power stage and frequency flexibility for smaller footprint, lower quiescent current, and No RSENSE efficiency advantage in <5W applications.
Availability
LTC3872HDDB#TRMPBF 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 LTC3872HDDB#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 portfolio. The company specializes in precision signal conditioning, power conversion, and timing solutions for demanding applications.
The LTC3872HDDB#TRMPBF belongs to Linear's No RSENSE boost controller product line, designed specifically for high-efficiency, low-component-count DC/DC conversion in space- and thermally constrained environments such as automotive infotainment and telecom infrastructure.
FAQ
What is the maximum output voltage supported by the LTC3872HDDB#TRMPBF?
The LTC3872HDDB#TRMPBF supports output voltages up to 60V, as confirmed by its SW pin absolute maximum rating of –0.3V to 60V and application circuits demonstrating 5V, 12V, and 48V outputs. This enables use in telecom -48V systems, PoE midspans, and industrial 24V-to-48V conversion - provided the external MOSFET and diode are rated accordingly.
How does the No RSENSE architecture in the LTC3872HDDB#TRMPBF improve efficiency?
The LTC3872HDDB#TRMPBF eliminates the external current sense resistor by measuring voltage drop across the RDS(ON) of the external N-channel MOSFET. This removes 50–200mΩ of series resistance, reducing conduction losses by up to 1.5% at full load and freeing PCB area - verified in typical application efficiency plots showing >92% at 2A output.
What is the purpose of the IPRG pin on the LTC3872HDDB#TRMPBF?
The IPRG pin on the LTC3872HDDB#TRMPBF selects the peak current limit threshold: 65mV (IPRG = GND), 130mV (IPRG = FLOAT), or 215mV (IPRG = VIN). This allows precise adaptation of current limiting to the chosen MOSFET's RDS(ON), ensuring optimal short-circuit protection and conduction loss trade-off - specified per grade in the Electrical Characteristics table.
Does the LTC3872HDDB#TRMPBF require external slope compensation?
No, the LTC3872HDDB#TRMPBF includes internal slope compensation optimized for its 550kHz oscillator and No RSENSE sensing architecture. This eliminates external components and ensures stable current-mode operation above 50% duty cycle - confirmed in the Functional Diagram and Applications Information section describing "internally fixed ramp compensation waveform."
What is the thermal performance difference between the TS8 and DDB packages for the LTC3872HDDB#TRMPBF?
The LTC3872HDDB#TRMPBF uses the 3mm × 2mm DFN (DDB) package with θJA = 76°C/W, significantly better than the TSOT-23 (TS8) package's θJA = 195°C/W. This 2.5× lower thermal resistance enables higher continuous power dissipation at the same ambient temperature - critical for 150°C junction-rated operation in automotive and industrial applications.
LTC3872HDDB#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LTC3872HDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3872HDDB#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 LTC3872HDDB#TRMPBF reliable?
The price and inventory of LTC3872HDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3872HDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3872HDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3872HDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3872HDDB#TRMPBF?
LTC3872HDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3872HDDB#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 LTC3872HDDB#TRMPBF?
For technical support, including LTC3872HDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3872HDDB#TRMPBF requirements.
6.How does Aetrix verify that LTC3872HDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3872HDDB#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 LTC3872HDDB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3872HDDB#TRMPBF?
All LTC3872HDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3872HDDB#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 LTC3872HDDB#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3872HDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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