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Analog Devices Inc. LTC3872EDDB#TRMPBF
- Part No.:
- LTC3872EDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3872EDDB#TRMPBF.pdf
- Description:
- IC REG CTRLR BOOST 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,776
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Product details
Overview
LTC3872EDDB#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 IP phone converters.
For engineers reviewing the LTC3872EDDB#TRMPBF datasheet, LTC3872EDDB#TRMPBF pinout, LTC3872EDDB#TRMPBF application, or LTC3872EDDB#TRMPBF equivalent, key selection criteria include No RSENSE operation, adjustable current limit via IPRG pin, internal soft-start, pulse-skipping at light load, and DFN-8 (3mm × 2mm) thermal performance with θJA = 76°C/W.
Technical Context
The LTC3872EDDB#TRMPBF implements No RSENSE current sensing by monitoring the voltage drop across the external N-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 to extend maximum output voltage capability. The RUN/SS pin provides shutdown control and optional external soft-start via capacitor charging with 0.7µA current, while 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/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 temperature - ensures stable regulation in telecom and industrial environments. |
| Current Limit Method | No RSENSE MOSFET RDS(ON) sensing - eliminates power loss and board space of external sense resistor. |
| Soft-Start | Internal 1ms default + optional external via RUN/SS capacitor - prevents inrush current during power-up. |
| Operating Temp Range | –40°C to +85°C - qualified for commercial and industrial ambient conditions. |
| Package Thermal Resistance | θJA = 76°C/W (DFN-8) - enables higher power density vs. TSOT-23 (195°C/W). |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN with exposed pad (Pin 9 = GND), rated for 150°C max junction temperature and optimized for low thermal resistance (θJA = 76°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IPRG (Pin 1) | Current limit select | Configures peak current threshold (70–290mV) by tying to GND, floating, or VIN - sets MOSFET conduction limit without external components. |
| ITH (Pin 2) | Error amplifier output / compensation node | 0.7V–1.9V range sets current comparator threshold - used for loop compensation and stability tuning. |
| VFB (Pin 3) | Feedback input | Monitors resistor-divider output voltage; internal 1.2V reference enables precise VO programming (e.g., 5V from 3.3V input). |
| GND (Pin 4, Exposed Pad) | Power and signal ground | Exposed pad must be soldered to PCB ground plane - critical for thermal dissipation and noise immunity. |
| NGATE (Pin 5) | N-MOSFET gate driver output | 0V to VIN swing drives external high-side N-channel switch - requires Schottky clamping for layout-induced negative spikes. |
| VIN (Pin 6) | Supply input | Powers internal circuitry; must be decoupled locally with ≥1µF ceramic capacitor to minimize noise coupling. |
| RUN/SS (Pin 7) | Enable and soft-start control | <0.85V disables IC (8µA IQ); capacitor on this pin enables linear VITH ramp for controlled start-up. |
| SW (Pin 8) | Switch node / current sense input | Connects to MOSFET drain and inductor; senses voltage drop across RDS(ON) for No RSENSE operation - rated to 60V. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE current sensing | Eliminates external sense resistor - saves BOM cost, PCB area, and conduction losses in high-current boost stages. |
| Adjustable current limit | Three-level IPRG configuration (GND/floating/VIN) selects 70/170/270mV thresholds - adapts to MOSFET RDS(ON) and load requirements. |
| Pulse-skipping at light load | Maintains regulation while skipping cycles below ~10% load - reduces switching loss and improves light-load efficiency. |
| Internal soft-start + external option | 1ms fixed ramp plus RUN/SS capacitor support - prevents output overshoot and inductor saturation during startup. |
| High-frequency 550kHz operation | Enables use of 1µH–2.2µH inductors - reduces solution size and cost vs. lower-frequency controllers. |
| Undervoltage lockout (UVLO) | 2.3V rising threshold - protects against brownout operation and ensures reliable startup from weak sources like depleted batteries. |
Applications
| Telecom Power Supplies | IP Phone Power Supplies |
|---|---|
Use Scenario: Generating isolated 48V or 54V bias from 3.3V/5V backplane rails in VoIP gateway systems. IC Role / Device Role: Primary boost controller managing MOSFET gate drive, current limiting, and output regulation without sense resistor. Use Value: Enables compact, high-efficiency 48V generation with <1% output ripple and no additional current-sense BOM cost. | Use Scenario: Providing regulated 5V/12V auxiliary power from PoE-powered Ethernet ports in IP desk phones. IC Role / Device Role: Constant-frequency boost controller delivering up to 2A output with pulse-skipping for standby mode efficiency. Use Value: Achieves >90% efficiency at full load and maintains regulation down to 10mA via light-load pulse skipping. |
| 42V Automotive Systems | 24V Industrial Controls |
Use Scenario: Boosting 12V battery rail to 42V for legacy high-power lighting or actuator drivers in commercial vehicles. IC Role / Device Role: High-voltage boost controller operating across –40°C to +85°C with UVLO and thermal robustness. Use Value: Supports 60V SW rating and 150°C TJMAX - withstands load-dump transients and engine-bay thermal stress. | Use Scenario: Generating 24V or 36V from 12V DC supply in PLC I/O modules and sensor interface boards. IC Role / Device Role: Current-mode boost controller ensuring fast transient response to step-load changes in industrial sensors. Use Value: ±1.5% feedback accuracy and 550kHz switching maintain tight regulation under dynamic 10–90% load steps. |
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 with θJA = 195°C/W - higher thermal resistance limits power handling. | Suitable for lower-current (<1A) designs where board space is constrained but thermal margin is sufficient. | Select when footprint size is prioritized over thermal performance and output current exceeds 1.2A. |
| TPS61088RHLR | Integrated 6.5A switch, 2.7V–12V input, fixed 5.1V/adjustable output - no external MOSFET required but lacks No RSENSE flexibility. | Better for cost-sensitive, medium-current (≤4A) applications where integration outweighs design flexibility. | Choose when system-level integration and reduced external component count are primary goals over MOSFET optimization. |
Compared with LTC3872ETS8#TRPBF, the LTC3872EDDB#TRMPBF offers 2.5× lower thermal resistance for higher continuous output current in space-constrained industrial layouts; versus TPS61088RHLR, it trades integration for design flexibility in high-voltage (>24V) and high-efficiency No RSENSE implementations.
Availability
LTC3872EDDB#TRMPBF 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#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 with rigorous qualification standards.
The LTC3872EDDB#TRMPBF belongs to Linear's No RSENSE boost controller family, designed specifically for high-efficiency, low-component-count DC/DC boost conversion in space- and thermally constrained applications.
FAQ
What is the maximum output voltage supported by the LTC3872EDDB#TRMPBF?
The LTC3872EDDB#TRMPBF supports output voltages up to 60V, as confirmed by its SW pin absolute maximum rating of –0.3V to 60V. This enables use in high-voltage boost applications such as telecom 48V generation and automotive 42V systems. The actual achievable output depends on external MOSFET BVDSS rating and diode PIV rating - both must exceed the target VOUT plus margin for ringing.
How does the No RSENSE architecture work in the LTC3872EDDB#TRMPBF?
The LTC3872EDDB#TRMPBF implements No RSENSE by measuring the voltage drop across the RDS(ON) of the external N-channel MOSFET connected to the SW pin. This eliminates the need for a discrete current-sense resistor, reducing power loss and PCB area. The IPRG pin selects the current-limit threshold (70–290mV), and the controller adjusts peak inductor current accordingly - all without adding series resistance in the power path.
What package type and thermal characteristics does the LTC3872EDDB#TRMPBF have?
The LTC3872EDDB#TRMPBF uses an 8-lead (3mm × 2mm) plastic DFN package with exposed thermal pad (Pin 9 = GND). Its thermal resistance is θJA = 76°C/W when properly soldered to a 1-in² copper pad, significantly lower than the TSOT-23 variant (195°C/W). This allows higher continuous output current in thermally demanding applications like industrial 24V boost converters.
Can the LTC3872EDDB#TRMPBF operate with a 3.3V input to generate 5V output?
Yes - the LTC3872EDDB#TRMPBF is explicitly validated for 3.3V input to 5V output boost conversion, as shown in the Typical Application schematic (3872 TA01). With 2A output capability and >90% efficiency at full load, it meets requirements for USB-powered peripherals and embedded systems. Input voltage must remain ≥2.75V to ensure proper UVLO release and gate drive strength.
What is the function of the IPRG pin on the LTC3872EDDB#TRMPBF?
The IPRG pin on the LTC3872EDDB#TRMPBF sets the peak current limit threshold for the external MOSFET: 70mV when tied to GND, 170mV when floating, and 270mV when tied to VIN. This allows precise adaptation to the MOSFET's RDS(ON) value and desired current limit without external resistors - a core enabler of the No RSENSE architecture in the LTC3872EDDB#TRMPBF.
LTC3872EDDB#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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC3872EDDB#TRMPBF FAQ
1.How can I place an order for LTC3872EDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3872EDDB#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 LTC3872EDDB#TRMPBF reliable?
The price and inventory of LTC3872EDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3872EDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3872EDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3872EDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3872EDDB#TRMPBF?
LTC3872EDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3872EDDB#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 LTC3872EDDB#TRMPBF?
For technical support, including LTC3872EDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3872EDDB#TRMPBF requirements.
6.How does Aetrix verify that LTC3872EDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3872EDDB#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 LTC3872EDDB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3872EDDB#TRMPBF?
All LTC3872EDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3872EDDB#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 LTC3872EDDB#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3872EDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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