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Analog Devices Inc. LTC3872IDDB#TRMPBF
- Part No.:
- LTC3872IDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3872IDDB#TRMPBF.pdf
- Description:
- IC REG CTRLR BOOST 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,341
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Product details
Overview
LTC3872IDDB#TRMPBF from Analog Devices (formerly Linear Technology) is a constant-frequency current-mode DC/DC boost 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 runs at 550kHz switching frequency - enabling compact 3.3V-to-5V/2A telecom and industrial power supplies.
For engineers reviewing the LTC3872IDDB#TRMPBF datasheet, LTC3872IDDB#TRMPBF pinout, LTC3872IDDB#TRMPBF application, or LTC3872IDDB#TRMPBF equivalent, key selection considerations include No RSENSE™ current sensing, adjustable peak current limit via IPRG pin, internal soft-start, pulse-skipping at light load, and thermal performance in the 2mm × 3mm DFN package with exposed pad.
Technical Context
The LTC3872IDDB#TRMPBF implements a No RSENSE™ architecture that senses switch-node voltage across the MOSFET's RDS(ON) instead of using a discrete current-sense resistor - reducing component count, improving efficiency, and minimizing board space. Its current-mode control loop uses the ITH pin as the error amplifier output and current comparator threshold reference.
It integrates undervoltage lockout (UVLO) with 2.3V rising threshold, supports external soft-start via RUN/SS pin with 0.7µA trickle charge, and features built-in slope compensation to prevent subharmonic oscillation above 50% duty cycle. The device maintains constant-frequency operation down to very light loads via controlled cycle skipping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Current-mode boost DC/DC controller - enables stable regulation with fast transient response for varying line/load conditions. |
| Input Voltage Range | 2.75V to 9.8V - supports single-cell Li-ion, 3.3V logic rails, and wide-input industrial supplies. |
| Output Voltage Range | Up to 60V - allows high-ratio boosting for IP phone, telecom, and 42V automotive auxiliary rails. |
| Switching Frequency | 550kHz typical - permits use of small 1µH inductors and reduces output filter size. |
| Feedback Accuracy | ±1.5% over temperature - ensures tight output regulation without trimming in production. |
| Peak Current Limit | Adjustable via IPRG pin (65–290mV range) - enables precise MOSFET overcurrent protection across operating conditions. |
| Operating Temp Range | –40°C to +125°C junction - qualified for industrial and extended-temperature embedded applications. |
| Package | 8-pin 2mm × 3mm DFN with exposed GND pad - provides low θJA = 76°C/W for thermally demanding layouts. |
Pinout & Package
Package: 8-lead plastic DFN (3mm × 2mm), 1mm profile, exposed pad (Pin 9) connected to GND - requires soldering of exposed pad for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IPRG (Pin 1) | Current limit select input | Configures peak current threshold (GND/floating/VIN) - sets 65/130/215mV default limits for MOSFET RDS(ON)-based sensing. |
| ITH (Pin 2) | Error amplifier output / 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 - compares to 1.2V internal reference to regulate VOUT. |
| GND (Pin 4, Exposed Pad) | Power and signal ground | Reference for all analog circuitry and primary thermal path - exposed pad must be soldered to PCB ground plane. |
| NGATE (Pin 5) | N-channel MOSFET gate driver output | Drives external MOSFET gate from 0V to VIN - rated for ±0.3V to (VIN + 0.3V) voltage swing. |
| VIN (Pin 6) | Supply input | Powers internal circuitry - must be decoupled locally with ≥10µF ceramic capacitor. |
| RUN/SS (Pin 7) | Enable and soft-start control | <0.85V disables IC (8µA shutdown IQ); capacitor on this pin enables linear soft-start with 0.7µA charge current. |
| SW (Pin 8) | Switch node / current sense input | Connects to MOSFET drain and inductor - senses voltage drop across RDS(ON) for No RSENSE™ current measurement (max 60V rating). |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE™ current sensing | Eliminates external sense resistor - improves efficiency by ~2–3%, saves PCB area, and removes associated power loss and thermal derating. |
| Adjustable peak current limit | Three preset thresholds (via IPRG pin) allow optimization of MOSFET stress and short-circuit protection without changing layout. |
| Internal soft-start + optional external | Default 1ms internal ramp prevents inrush; external capacitor on RUN/SS enables user-defined start-up time and controlled VOUT slew rate. |
| Pulse-skipping at light load | Maintains regulation while reducing switching losses - improves light-load efficiency and minimizes audible noise and EMI. |
| High-frequency 550kHz operation | Enables use of sub-2mm height, 1µH inductors - critical for space-constrained telecom modules and portable equipment. |
| Robust thermal design | DFN package with θJA = 76°C/W - supports >1.5W dissipation in standard 2-layer PCBs without heatsinks. |
Applications
| Telecom Power Supplies | 42V Automotive Systems |
|---|---|
Use Scenario: Generating isolated 5V/2A bias rail from 3.3V backplane in VoIP phones and optical line cards. IC Role / Device Role: Primary boost controller managing MOSFET gate drive, current sensing, and output regulation without sense resistor. Use Value: Enables compact, high-efficiency 3.3V-to-5V conversion meeting GR-63-CORE thermal and reliability requirements. | Use Scenario: Deriving 12V auxiliary supply from 12V battery during cold-crank (down to 6V) in ADAS camera modules. IC Role / Device Role: Boost controller sustaining regulated output during low-input transients using No RSENSE™ sensing and UVLO hysteresis. Use Value: Delivers uninterrupted 12V/1A power under 6V–16V input range with no external sense resistor failure mode. |
| 24V Industrial Controls | IP Phone Power Supplies |
Use Scenario: Providing 24V-to-48V boost for PoE midspan injectors in factory automation gateways. IC Role / Device Role: High-voltage boost controller driving 60V-rated MOSFET with precision current limiting via IPRG configuration. Use Value: Supports 48V/0.5A output with ±1.5% accuracy and thermal stability up to +125°C ambient. | Use Scenario: Converting 5V USB power to 48V phantom power for IP desk phones with IEEE 802.3af compatibility. IC Role / Device Role: Constant-frequency boost controller delivering tightly regulated 48V with pulse-skipping for standby efficiency. Use Value: Meets 48V ±3% tolerance and <50mVpp ripple requirements while maintaining >85% efficiency at full load. |
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 0°C to 85°C junction temperature (vs. –40°C to 125°C). | Suitable only for commercial-temperature environments - not qualified for industrial or automotive thermal profiles. | Select when cost sensitivity outweighs extended temperature requirement and ambient stays below 85°C. |
| LT3958EUHE#PBF | Wider input (4.5V–100V), higher output (up to 80V), integrated 5A MOSFET driver - no No RSENSE™; requires external sense resistor. | Supports higher-power (>5A) and higher-input applications but increases BOM count and reduces efficiency vs. No RSENSE™. | Choose when input exceeds 9.8V or output exceeds 60V, or when integrated high-current gate drive is needed. |
Compared with LTC3872EDDB#TRPBF, the LTC3872IDDB#TRMPBF offers guaranteed operation to +125°C junction - critical for enclosed industrial enclosures. Versus LT3958EUHE#PBF, it trades off input/output voltage range and integration for superior efficiency, smaller solution size, and lower component count via No RSENSE™ architecture.
Availability
LTC3872IDDB#TRMPBF 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 traceable sourcing.
Supply support for LTC3872IDDB#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. Linear pioneered precision DC/DC controllers with innovations like No RSENSE™ and proprietary current-mode architectures.
The LTC3872IDDB#TRMPBF belongs to Linear's No RSENSE™ boost controller family, designed specifically for high-efficiency, low-component-count DC/DC conversion in space- and thermal-constrained applications such as telecom infrastructure and industrial edge devices.
FAQ
What is the maximum output voltage supported by the LTC3872IDDB#TRMPBF?
The LTC3872IDDB#TRMPBF supports output voltages up to 60V, as confirmed by the SW pin absolute maximum rating of –0.3V to 60V and verified in the Applications Information section. This enables use in 48V telecom systems, PoE midspans, and 42V automotive auxiliary rails - provided the external MOSFET and diode are rated accordingly.
Does the LTC3872IDDB#TRMPBF require an external current-sense resistor?
No, the LTC3872IDDB#TRMPBF implements Linear's No RSENSE™ architecture and senses current through 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 - as explicitly stated in the Features and Description sections of the datasheet.
What is the operating temperature range of the LTC3872IDDB#TRMPBF?
The LTC3872IDDB#TRMPBF is specified for a junction temperature range of –40°C to +125°C, corresponding to the "I" grade in Linear's ordering matrix. This is confirmed in the Order Information table (LTC3872IDDB#PBF / #TRPBF) and Electrical Characteristics notes, making it suitable for industrial and extended-temperature applications.
How does the IPRG pin affect current limiting on the LTC3872IDDB#TRMPBF?
The IPRG pin on the LTC3872IDDB#TRMPBF selects one of three peak current threshold levels: 65mV (IPRG = GND), 130mV (IPRG = floating), or 215mV (IPRG = VIN). These values are specified in the Electrical Characteristics table for the "I" grade and directly set the maximum allowable voltage drop across the MOSFET's RDS(ON) during current limiting.
Can the LTC3872IDDB#TRMPBF be used in SEPIC or flyback topologies?
Yes, the LTC3872IDDB#TRMPBF is explicitly designed for boost, SEPIC, and flyback converter applications, as stated in the Main Control Loop section (Page 7). Its No RSENSE™ sensing and current-mode architecture support all three topologies - though external component selection (e.g., transformer turns ratio, coupling capacitor value) must be adapted per topology.
LTC3872IDDB#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC3872IDDB#TRMPBF FAQ
1.How can I place an order for LTC3872IDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3872IDDB#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 LTC3872IDDB#TRMPBF reliable?
The price and inventory of LTC3872IDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3872IDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3872IDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3872IDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3872IDDB#TRMPBF?
LTC3872IDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3872IDDB#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 LTC3872IDDB#TRMPBF?
For technical support, including LTC3872IDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3872IDDB#TRMPBF requirements.
6.How does Aetrix verify that LTC3872IDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3872IDDB#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 LTC3872IDDB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3872IDDB#TRMPBF?
All LTC3872IDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3872IDDB#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 LTC3872IDDB#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3872IDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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