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Analog Devices Inc. LTC3872IDDB-1#TRMPBF
- Part No.:
- LTC3872IDDB-1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3872IDDB-1#TRMPBF.pdf
- Description:
- IC REG CTRLR BOOST 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,624
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Product details
Overview
LTC3872IDDB-1#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% output voltage accuracy, and features 550kHz switching frequency for compact inductor sizing - used in telecom power supplies and industrial 24V control systems.
For engineers reviewing the LTC3872IDDB-1#TRMPBF datasheet, LTC3872IDDB-1#TRMPBF pinout, LTC3872IDDB-1#TRMPBF application, or LTC3872IDDB-1#TRMPBF equivalent, key selection criteria include No RSENSE operation, adjustable current limit via IPRG pin, internal soft-start, pulse-skipping at light load, and –40°C to 125°C operating junction temperature range.
Technical Context
The LTC3872IDDB-1#TRMPBF implements a No RSENSE architecture that senses current through the MOSFET's RDS(ON), eliminating external 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 integrates a 550kHz oscillator, undervoltage lockout (UVLO) with 2.3V rising threshold, RUN/SS pin for shutdown and external soft-start, and NGATE driver capable of swinging 0V to VIN. The device supports both MOSFET RDS(ON) sensing and discrete resistor sensing on the SW pin, with peak sense thresholds configurable via IPRG (GND/FLOAT/VIN) at 105mV/180mV/285mV (typical, I-grade).
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 12V-derived inputs. |
| Output Voltage Range | Up to 60V - enables high-voltage boost for telecom and industrial bus generation. |
| Switching Frequency | 550kHz (typical) - allows use of sub-2.2µH inductors and reduces output filter size. |
| Feedback Accuracy | ±1.5% over –40°C to 125°C - ensures stable regulation across extended industrial temperature range. |
| UVLO Threshold | 2.3V (rising), 2.05V (falling) - prevents erratic startup during brownout conditions. |
| Shutdown Current | 8µA (typical) - minimizes battery drain in always-on systems. |
| Peak Sense Threshold | 105mV (IPRG = GND, I-grade) - sets precise current limit without external components. |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN with exposed pad (Pin 9 = GND). Thermal resistance θJA = 76°C/W. Exposed pad must be soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IPRG (Pin 1) | Current limit select input | Configures peak current threshold: GND = 105mV, FLOAT = 180mV, VIN = 285mV (I-grade). |
| ITH (Pin 2) | Error amplifier compensation node | Carries loop compensation signal; voltage sets current comparator threshold (0.7V–1.9V range). |
| VFB (Pin 3) | Feedback input | Monitors divided output voltage; compared to 1.2V internal reference for regulation. |
| GND (Pin 4, Exposed Pad) | Power and signal ground | Reference for all analog circuitry; exposed pad provides primary thermal path to PCB. |
| NGATE (Pin 5) | N-MOSFET gate driver output | Drives external MOSFET gate from 0V to VIN; rated for ±0.3V beyond rail limits. |
| VIN (Pin 6) | Supply input | Powers internal circuitry; requires local 1µF ceramic decoupling to GND. |
| RUN/SS (Pin 7) | Enable and soft-start control | Below 0.85V = shutdown (8µA IQ); capacitor here enables controlled VITH ramp-up. |
| SW (Pin 8) | Switch node / current sense input | Connects to MOSFET drain and inductor; senses switch voltage drop for No RSENSE operation. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE current sensing | Eliminates external sense resistor, reducing BOM count, board area, and conduction losses. |
| Adjustable current limit | Three preset thresholds via IPRG pin - enables optimization for different MOSFET RDS(ON) and load requirements. |
| Internal soft-start + optional external | 1ms default internal ramp; external capacitor on RUN/SS allows programmable start-up dV/dt to limit inrush. |
| Pulse-skipping at light load | Maintains regulation while reducing switching activity - improves light-load efficiency and lowers audible noise. |
| High-temperature grade | Rated for –40°C to 125°C junction operation - suitable for under-hood automotive and industrial environments. |
Applications
| Telecom Power Supplies | 42V Automotive Systems |
|---|---|
Use Scenario: Generating 5V/2A bias rail from 3.3V backplane in VoIP gateway or base station card. IC Role / Device Role / Timing Role: Boost controller managing power conversion with no external sense resistor and tight output regulation. Use Value: Reduces component count and improves efficiency versus resistor-based sensing, critical in space-constrained telecom modules. | Use Scenario: Step-up converter supplying 12V/1.5A from 5V microcontroller domain to drive solenoids or sensors in 42V vehicle subsystems. IC Role / Device Role / Timing Role: High-reliability DC/DC controller operating across automotive temperature range with UVLO protection. Use Value: ±1.5% output accuracy and 125°C rating ensure stable operation in engine bay proximity without derating. |
| 24V Industrial Controls | IP Phone Power Supplies |
Use Scenario: Providing isolated 24V auxiliary supply from 12V field bus in PLC I/O module. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller enabling predictable EMI profile and fast transient response to load steps. Use Value: 550kHz operation allows small magnetics; pulse-skipping maintains >85% efficiency at 10% load in intermittent-duty industrial nodes. | Use Scenario: Onboard 5V/1A power for PoE-powered IP phone electronics, derived from 48V PSE input via intermediate buck stage. IC Role / Device Role / Timing Role: Secondary boost regulator delivering clean, regulated output with low-noise soft-start for audio-sensitive applications. Use Value: Internal soft-start and pulse-skipping minimize output voltage overshoot and acoustic noise during boot and call setup. |
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 functionality, but rated for 0°C to 85°C junction temperature. | Not suitable for extended-temperature industrial or automotive under-hood use. | Select only for commercial-temperature applications where cost is prioritized over thermal margin. |
| LTC3872HDDB-1#TRPBF | Same functionality, rated for –40°C to 150°C junction temperature. | Higher thermal rating enables operation in extreme environments (e.g., engine control units). | Choose when ambient temperatures exceed 125°C or long-term reliability at elevated TJ is required. |
Compared with LTC3872IDDB-1#TRMPBF, the E-grade alternative sacrifices temperature capability for lower cost, while the H-grade extends thermal headroom at identical footprint and function - enabling direct substitution only when temperature requirements align.
Availability
LTC3872IDDB-1#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.
Supply support for LTC3872IDDB-1#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 precision analog and power management portfolio. Linear's legacy design ethos emphasizes high-performance, robust, and application-ready ICs.
The LTC3872 family delivers No RSENSE boost control for high-efficiency, low-component-count DC/DC conversion - engineered specifically for space-constrained, thermally demanding applications in telecom, industrial, and automotive power systems.
FAQ
What is the maximum output voltage supported by the LTC3872IDDB-1#TRMPBF?
The LTC3872IDDB-1#TRMPBF supports output voltages up to 60V, as confirmed by its SW pin absolute maximum rating of –0.3V to 60V and explicit specification in the Features section. This enables use in high-voltage boost applications such as telecom bias rails and industrial bus generation, provided external MOSFET and diode ratings are appropriately selected.
Does the LTC3872IDDB-1#TRMPBF require an external current sense resistor?
No, the LTC3872IDDB-1#TRMPBF implements No RSENSE architecture and senses current through the RDS(ON) of the external N-channel MOSFET. This eliminates the need for a discrete sense resistor, reducing power loss, board area, and BOM cost - a core feature explicitly documented in the device description and functional diagram.
What is the operating temperature range of the LTC3872IDDB-1#TRMPBF?
The LTC3872IDDB-1#TRMPBF is specified for a junction temperature range of –40°C to 125°C, as stated in the Order Information table for the IDDB package variant. This I-grade rating makes it suitable for industrial control and under-hood automotive applications where extended thermal performance is required.
How does the IPRG pin affect current limiting on the LTC3872IDDB-1#TRMPBF?
The IPRG pin on the LTC3872IDDB-1#TRMPBF selects one of three peak current sense thresholds: 105mV (IPRG = GND), 180mV (IPRG = FLOAT), or 285mV (IPRG = VIN), per Electrical Characteristics table. This directly sets the maximum MOSFET current before cycle-by-cycle limiting engages, allowing design flexibility across different RDS(ON) MOSFETs and load requirements.
Can the LTC3872IDDB-1#TRMPBF be used in SEPIC or flyback topologies?
Yes, the LTC3872IDDB-1#TRMPBF is explicitly qualified for SEPIC and flyback converter applications in addition to boost, as stated in the Main Control Loop section. Its No RSENSE current sensing and current-mode architecture support these topologies when configured with appropriate external components and transformer/inductor winding polarity.
LTC3872IDDB-1#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-1#TRMPBF FAQ
1.How can I place an order for LTC3872IDDB-1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3872IDDB-1#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-1#TRMPBF reliable?
The price and inventory of LTC3872IDDB-1#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-1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3872IDDB-1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3872IDDB-1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3872IDDB-1#TRMPBF?
LTC3872IDDB-1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3872IDDB-1#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-1#TRMPBF?
For technical support, including LTC3872IDDB-1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3872IDDB-1#TRMPBF requirements.
6.How does Aetrix verify that LTC3872IDDB-1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3872IDDB-1#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-1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3872IDDB-1#TRMPBF?
All LTC3872IDDB-1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3872IDDB-1#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-1#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3872IDDB-1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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