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Analog Devices Inc. LTC3872EDDB-1#TRPBF
- Part No.:
- LTC3872EDDB-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3872EDDB-1#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,121
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Product details
Overview
LTC3872EDDB-1#TRPBF from Analog Devices (formerly Linear Technology) is a constant-frequency current-mode boost DC/DC controller that drives 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 runs at 550kHz switching frequency-enabling compact 3.3V-to-5V, 2A telecom and IP phone power supplies.
For engineers reviewing the LTC3872EDDB-1#TRPBF datasheet, LTC3872EDDB-1#TRPBF pinout, LTC3872EDDB-1#TRPBF application, or LTC3872EDDB-1#TRPBF equivalent, key selection criteria include No RSENSE operation, adjustable current limit via IPRG pin, internal soft-start, pulse-skipping at light load, and DFN package thermal performance (θJA = 76°C/W).
Technical Context
The LTC3872EDDB-1#TRPBF implements constant-frequency current-mode control using the voltage drop across the external MOSFET's RDS(ON) for sensing-eliminating discrete sense resistors and improving efficiency. Its error amplifier regulates VFB to a 1.2V reference with 0.14mV/V line regulation and 0.05% load regulation.
It features undervoltage lockout (UVLO) at 2.3V (rising), shutdown threshold at 0.85V on RUN/SS, and no frequency foldback-distinguishing it from the standard LTC3872. The ITH pin serves as the error amplifier output and current comparator threshold control point, with nominal operating range 0.7V–1.9V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 550kHz typical; enables use of small 1µH inductors and reduces output ripple vs lower-frequency controllers. |
| Input Voltage Range | 2.75V to 9.8V; supports single-cell Li-ion, 3.3V logic rails, and 5V bus inputs without pre-regulation. |
| Output Voltage Range | Up to 60V; accommodates wide-range boost applications including 24V industrial and 42V automotive auxiliary rails. |
| Feedback Accuracy | ±1.5% over temperature; ensures stable 5V output in IP phone power supplies despite ambient variations. |
| Current Limit Threshold | Adjustable from 80mV to 310mV via IPRG pin; allows precise MOSFET RDS(ON)-based current limiting without external components. |
| Thermal Resistance θJA | 76°C/W (DFN package); enables higher continuous output current vs TSOT-23 (195°C/W) under same PCB layout. |
| Shutdown Current | 8µA typical; minimizes battery drain in always-on telecom backup systems. |
Pinout & Package
The LTC3872EDDB-1#TRPBF is housed in an 8-lead, 3mm × 2mm plastic DFN package with exposed pad (Pin 9) soldered to PCB ground for optimal thermal and electrical performance (TJMAX = 150°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IPRG (Pin 1) | Current limit select | Configures peak current threshold (80–310mV) by tying to GND, VIN, or floating-directly sets MOSFET overcurrent trip level. |
| ITH (Pin 2) | Error amplifier output | Carries compensation signal; voltage (0.7–1.9V) sets current comparator threshold and controls loop stability. |
| VFB (Pin 3) | Feedback input | Monitors resistor-divider output voltage; deviation from 1.2V reference adjusts ITH to maintain regulation. |
| GND (Pin 4 + Exposed Pad) | Power and signal ground | Primary return path; exposed pad must be soldered to PCB ground plane for rated thermal performance (θJA = 76°C/W). |
| NGATE (Pin 5) | N-MOSFET gate driver | Drives external high-side N-channel MOSFET gate from 0V to VIN; 40ns rise/fall time supports 550kHz switching. |
| VIN (Pin 6) | Supply input | Powers internal circuitry; requires local 10µF ceramic decoupling close to pin to suppress switching noise. |
| RUN/SS (Pin 7) | Enable & soft-start | Pull below 0.85V to shut down (8µA IQ); connect capacitor for controlled start-up ramp of ITH voltage. |
| SW (Pin 8) | Switch node | Connects to MOSFET drain and inductor; senses switch voltage for No RSENSE current mode; rated to 60V. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE current sensing | Eliminates 5–10mΩ sense resistor, saving board space, reducing BOM cost, and improving full-load efficiency by ~2%. |
| 550kHz fixed-frequency operation | Enables <1.5mm height designs using 1µH inductors-critical for slim IP phone and telecom module form factors. |
| Adjustable current limit via IPRG | Three preset thresholds (GND/VIN/floating) allow one IC design to support multiple output current levels without changing feedback network. |
| Pulse-skipping at light load | Maintains constant frequency down to near-zero load, minimizing audible noise and EMI while sustaining >85% efficiency at 10mA output. |
| Internal soft-start + optional external | 1ms default ramp prevents inrush current; external capacitor on RUN/SS enables programmable start-up time for sequencing-sensitive systems. |
Applications
| Telecom Power Supplies | IP Phone Power Supplies |
|---|---|
Use Scenario: Providing isolated 5V/2A power from 3.3V backplane in VoIP gateway line cards. IC Role / Device Role / Timing Role: Boost controller managing energy transfer via external MOSFET and Schottky diode; regulates output using resistor divider feedback. Use Value: No RSENSE architecture achieves >92% peak efficiency at 2A, reducing thermal load on densely packed telecom boards. | Use Scenario: Generating 5V rail from PoE-powered 3.3V supply in desktop IP phones. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller driving high-side N-MOSFET; uses SW pin for MOSFET RDS(ON) sensing. Use Value: 550kHz operation allows miniature 1µH inductor and 10µF ceramic output cap-meeting strict height constraints (<1.2mm) of consumer IP phones. |
| 42V Automotive Systems | 24V Industrial Controls |
Use Scenario: Generating 12V/1A auxiliary supply from 42V battery in ADAS camera modules during cold-crank (down to 2.75V input). IC Role / Device Role / Timing Role: Input-robust boost controller with UVLO at 2.3V; maintains regulation across wide input transients. Use Value: ±1.5% output accuracy and 150°C junction rating ensure reliable sensor and MCU power under under-hood thermal stress. | Use Scenario: Stepping up 24V field bus to 48V for actuator drivers in PLC I/O modules. IC Role / Device Role / Timing Role: High-voltage boost controller with 60V SW pin rating; interfaces directly to 48V output without level-shifting. Use Value: Adjustable current limit (via IPRG) allows safe operation with diverse MOSFETs-supporting both low-RDS(ON) and high-BVDSS variants in one BOM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3872ETS8-1#TRPBF | Same functionality but in 8-lead TSOT-23 package (θJA = 195°C/W); smaller footprint but higher thermal resistance. | Better suited for space-constrained, low-power (<500mA) applications where board area is critical and thermal headroom exists. | Select when PCB real estate is more constrained than thermal budget; verify thermal derating for >1A loads. |
| TPS40210DGQ | TI part with similar No RSENSE architecture; 1MHz max frequency, wider 2.95–15V input, but only ±2% FB accuracy and no pulse-skipping. | Preferred for higher-frequency, higher-input-voltage designs where light-load efficiency is secondary to size. | Choose for 12V-input industrial apps needing >1MHz switching; avoid where ±1.5% accuracy or ultra-low IQ shutdown is required. |
Compared with LTC3872ETS8-1#TRPBF, the LTC3872EDDB-1#TRPBF offers 2.5× lower thermal resistance for higher continuous current in same ambient; versus TPS40210DGQ, it provides tighter regulation and superior light-load behavior but narrower input range.
Availability
LTC3872EDDB-1#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, IP phone power supplies, and 42V automotive systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3872EDDB-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 and long-term product support.
The LTC3872EDDB-1#TRPBF belongs to Linear's No RSENSE boost controller family, designed specifically for high-efficiency, low-component-count DC/DC conversion in space- and thermally constrained applications like telecom and industrial edge devices.
FAQ
What is the maximum output voltage supported by the LTC3872EDDB-1#TRPBF?
The LTC3872EDDB-1#TRPBF supports output voltages up to 60V, as confirmed by its SW pin absolute maximum rating of –0.3V to 60V. This enables use in 24V and 42V industrial and automotive auxiliary power rails. The actual achievable output depends on external MOSFET BVDSS rating and diode PIV rating-not the controller itself.
Does the LTC3872EDDB-1#TRPBF require an external current sense resistor?
No, the LTC3872EDDB-1#TRPBF implements No RSENSE architecture and senses current via the voltage drop across the external N-channel MOSFET's RDS(ON). This eliminates the need for a discrete sense resistor, reducing component count, board space, and conduction losses-key to the LTC3872EDDB-1#TRPBF's high-efficiency design.
What is the operating temperature range for the LTC3872EDDB-1#TRPBF?
The LTC3872EDDB-1#TRPBF is specified for –40°C to +85°C junction temperature (Grade E). Its DFN package has θJA = 76°C/W, so ambient operating range depends on PCB copper area and airflow-but full specification is guaranteed across –40°C to 85°C ambient when properly mounted with exposed pad soldered to ground.
How does the IPRG pin configure current limiting on the LTC3872EDDB-1#TRPBF?
The IPRG pin on the LTC3872EDDB-1#TRPBF selects three factory-trimmed current sense thresholds: 80–120mV (IPRG = GND), 145–200mV (IPRG = floating), or 240–310mV (IPRG = VIN). This directly sets the peak inductor current trip point without external resistors-making the LTC3872EDDB-1#TRPBF adaptable to different MOSFET RDS(ON) values and output current requirements.
Can the LTC3872EDDB-1#TRPBF be used in SEPIC or flyback topologies?
Yes, the LTC3872EDDB-1#TRPBF is explicitly qualified for SEPIC and flyback converter applications per its datasheet description. Its current-mode architecture and SW pin sensing capability support these topologies-though external component selection (e.g., transformer turns ratio, capacitor ratings) must follow topology-specific design rules distinct from boost operation.
LTC3872EDDB-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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC3872EDDB-1#TRPBF FAQ
1.How can I place an order for LTC3872EDDB-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3872EDDB-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 LTC3872EDDB-1#TRPBF reliable?
The price and inventory of LTC3872EDDB-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 LTC3872EDDB-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3872EDDB-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3872EDDB-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3872EDDB-1#TRPBF?
LTC3872EDDB-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3872EDDB-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 LTC3872EDDB-1#TRPBF?
For technical support, including LTC3872EDDB-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3872EDDB-1#TRPBF requirements.
6.How does Aetrix verify that LTC3872EDDB-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3872EDDB-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 LTC3872EDDB-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3872EDDB-1#TRPBF?
All LTC3872EDDB-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3872EDDB-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 LTC3872EDDB-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3872EDDB-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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