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Analog Devices Inc. LTC3872EDDB#TRPBF
- Part No.:
- LTC3872EDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3872EDDB#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,183
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Product details
Overview
LTC3872EDDB#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% VOUT 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#TRPBF datasheet, LTC3872EDDB#TRPBF pinout, LTC3872EDDB#TRPBF application, or LTC3872EDDB#TRPBF equivalent, key selection criteria include No RSENSE™ operation, adjustable current limit via IPRG pin, internal soft-start, pulse-skipping at light load, and thermal performance in the 2mm × 3mm DFN package with exposed GND pad.
Technical Context
The LTC3872EDDB#TRPBF 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 integrates a 550kHz oscillator with duty-cycle-dependent frequency reduction above ~80% duty cycle, internal soft-start with 1ms default timing, undervoltage lockout (UVLO) at 2.3V (rising), and shutdown control via RUN/SS pin with 0.85V falling threshold. The SW pin serves dual roles: switch-node connection and internal current sense input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.75V to 9.8V - supports single-cell Li-ion, 3.3V logic rails, and 5V bus inputs without level-shifting. |
| Output Voltage Range | Up to 60V - enables high-ratio boost for 42V automotive auxiliary rails or industrial 24V-to-48V conversion. |
| Switching Frequency | 550kHz typical - allows use of sub-2.2µH inductors and reduces size of input/output filtering components. |
| Feedback Accuracy | ±1.5% over temperature - ensures stable regulation in telecom and industrial environments without trimming. |
| UVLO Threshold | 2.3V (rising), 2.05V (falling) - prevents erratic startup during brownout and ensures clean shutdown below battery depletion. |
| Shutdown Current | 8µA typical - minimizes quiescent drain in always-on systems like IP phones or remote sensors. |
| Package Thermal Resistance | θJA = 76°C/W - enables higher continuous output current in DFN vs. TSOT-23 due to exposed GND pad soldering. |
Pinout & Package
The LTC3872EDDB#TRPBF is housed in an 8-lead, 2mm × 3mm plastic DFN package with exposed pad (Pin 9), which must be soldered to PCB ground for electrical integrity and thermal performance (θJA = 76°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IPRG (Pin 1) | Current limit select | Configures peak current threshold: 100mV (GND), 170mV (float), or 270mV (VIN) - sets MOSFET conduction limit without external resistor. |
| ITH (Pin 2) | Error amplifier compensation node | 0.7V–1.9V range - directly controls current comparator trip point; used for loop compensation and soft-start ramp. |
| 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 | Reference for all analog circuitry; exposed pad must be soldered to PCB ground plane for thermal dissipation and noise immunity. |
| NGATE (Pin 5) | N-MOSFET gate driver output | 0V to VIN swing - drives external high-side N-channel MOSFET; requires Schottky clamp if layout induces negative spikes. |
| VIN (Pin 6) | Supply input | Powers internal circuitry; must be decoupled with ≥1µF ceramic capacitor close to pin to suppress switching noise. |
| RUN/SS (Pin 7) | Enable and soft-start control | Below 0.85V disables IC (8µA IQ); capacitor on this pin provides controlled VITH ramp for inrush-limited startup. |
| SW (Pin 8) | Switch node / current sense input | Connects to MOSFET drain and inductor; senses voltage drop across RDS(ON) for No RSENSE™ current mode control. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE™ current sensing | Eliminates external sense resistor, reducing BOM count, board area, and conduction losses - critical for high-efficiency, space-constrained designs. |
| Adjustable current limit via IPRG | Three programmable thresholds (100/170/270mV) allow precise MOSFET overcurrent protection without changing external components. |
| Pulse-skipping at light load | Maintains constant-frequency operation down to near-zero load while minimizing audible noise and RF emissions - ideal for always-on communication devices. |
| Internal soft-start with external option | 1ms default timing prevents inrush current; optional RC network on RUN/SS enables user-defined startup slope for sensitive loads. |
| Wide VIN range with UVLO | 2.75V–9.8V operation plus 2.3V UVLO ensures reliable startup from partially discharged batteries and graceful shutdown before system reset. |
Applications
| Telecom Power Supplies | IP Phone Power Supplies |
|---|---|
Use Scenario: Generating isolated 5V/2A from 3.3V backplane in VoIP gateway chassis with strict EMI limits. IC Role / Device Role / Timing Role: Boost controller managing MOSFET switching, current sensing, and output regulation - no external sense resistor required. Use Value: Achieves >90% efficiency at full load and low ripple via 550kHz operation, reducing filter component size and meeting EN55022 Class B conducted emissions. | Use Scenario: Local 5V rail generation from PoE-powered Ethernet interface in desktop IP phone. IC Role / Device Role / Timing Role: Primary DC/DC controller implementing No RSENSE™ boost with pulse-skipping for standby power <15mW. Use Value: Enables ultra-low quiescent current (8µA shutdown) and smooth soft-start to avoid disrupting Ethernet link negotiation. |
| 42V Automotive Systems | 24V Industrial Controls |
Use Scenario: Deriving 12V/1A auxiliary supply from 42V stop-start battery in ADAS camera module. IC Role / Device Role / Timing Role: High-input-voltage boost controller with UVLO hysteresis and thermal robustness in DFN package. Use Value: Supports wide input transients (up to 60V on SW pin) and maintains regulation during cold-crank (down to 2.75V VIN) without external supervision. | Use Scenario: Generating 15V bias for PLC I/O drivers from 24V field bus in factory automation cabinet. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller delivering stable output under variable load and ambient temperature (−40°C to 85°C). Use Value: ±1.5% VFB accuracy and 76°C/W θJA ensure long-term stability and thermal headroom without heatsinking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3872ETS8#TRPBF | Same die, TSOT-23-8 package (θJA = 195°C/W), rated for −40°C to 85°C junction. | Lower thermal performance; suitable only for lower-current or forced-air-cooled designs. | Select when board space is constrained and output current ≤1A with adequate airflow. |
| LT3958EFE#TRPBF | Wider VIN (4.5V–100V), integrated 5A MOSFET driver, but requires external sense resistor and lacks No RSENSE™. | Supports higher input voltages and currents, but adds BOM cost and reduces efficiency vs. No RSENSE™ topology. | Choose when input exceeds 9.8V or output current >2A is needed - not a drop-in replacement. |
Compared with LTC3872ETS8#TRPBF, the LTC3872EDDB#TRPBF offers superior thermal performance (76°C/W vs. 195°C/W) and identical electrical specs, making it preferred for sustained 2A operation. Versus LT3958EFE#TRPBF, it trades input voltage range and integration for higher efficiency and smaller solution size via No RSENSE™ architecture.
Availability
LTC3872EDDB#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 lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LTC3872EDDB#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#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 such as communications infrastructure and industrial edge devices.
FAQ
What is the maximum output voltage supported by the LTC3872EDDB#TRPBF?
The LTC3872EDDB#TRPBF supports output voltages up to 60V, as confirmed by its SW pin absolute maximum rating of −0.3V to 60V and design validation in boost, SEPIC, and flyback topologies. This enables use in 42V automotive auxiliary rails and industrial 24V-to-48V conversion where high step-up ratio is required.
Does the LTC3872EDDB#TRPBF require an external current sense resistor?
No, the LTC3872EDDB#TRPBF implements Linear's No RSENSE™ architecture, sensing current via 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 - a core feature validated across all LTC3872 variants including the LTC3872EDDB#TRPBF.
What is the operating temperature range for the LTC3872EDDB#TRPBF?
The LTC3872EDDB#TRPBF is specified for an operating junction temperature range of −40°C to 85°C, as indicated by the "E" grade in its part number and confirmed in the Order Information table. This range is suitable for commercial and industrial indoor applications including telecom equipment and IP phones.
How does the IPRG pin configure current limiting on the LTC3872EDDB#TRPBF?
The IPRG pin on the LTC3872EDDB#TRPBF selects one of three peak current sense thresholds: 100mV (IPRG = GND), 170mV (IPRG = float), or 270mV (IPRG = VIN). These values directly set the maximum voltage drop allowed across the external MOSFET during conduction, thereby defining the peak inductor current limit without external components.
Can the LTC3872EDDB#TRPBF be used in SEPIC or flyback configurations?
Yes, the LTC3872EDDB#TRPBF is explicitly qualified for SEPIC and flyback converter applications per its datasheet description and functional diagram. Its No RSENSE™ current sensing, constant-frequency current-mode control, and SW pin architecture support these topologies - identical behavior is documented for all LTC3872 variants, including the LTC3872EDDB#TRPBF.
LTC3872EDDB#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#TRPBF FAQ
1.How can I place an order for LTC3872EDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3872EDDB#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#TRPBF reliable?
The price and inventory of LTC3872EDDB#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3872EDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3872EDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3872EDDB#TRPBF?
LTC3872EDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3872EDDB#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#TRPBF?
For technical support, including LTC3872EDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3872EDDB#TRPBF requirements.
6.How does Aetrix verify that LTC3872EDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3872EDDB#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3872EDDB#TRPBF?
All LTC3872EDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3872EDDB#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3872EDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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