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Analog Devices Inc. LTC3872ETS8#TRMPBF
- Part No.:
- LTC3872ETS8#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC3872ETS8#TRMPBF.pdf
- Description:
- IC REG CTRLR BOOST TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,145
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Product details
Overview
LTC3872ETS8#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 systems.
For engineers reviewing the LTC3872ETS8#TRMPBF datasheet, LTC3872ETS8#TRMPBF pinout, LTC3872ETS8#TRMPBF application, or LTC3872ETS8#TRMPBF 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 TSOT-23-8 package.
Technical Context
The LTC3872ETS8#TRMPBF implements a No RSENSE current-sensing architecture that monitors voltage drop across the power 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 with duty-cycle-dependent frequency reduction above ~80% duty cycle to maintain minimum off-time, supports internal and external soft-start via RUN/SS, and features undervoltage lockout (UVLO) triggering at 2.3V (rising) with hysteresis. The SW pin serves dual roles: switch-node connection and internal current-sense input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Boost DC/DC controller - requires external N-MOSFET and diode; not a complete regulator IC. |
| Input Voltage Range | 2.75V to 9.8V - supports single-cell Li-ion, 3.3V/5V rails, and automotive 12V nominal with dropout margin. |
| Output Voltage Range | Up to 60V - enables high-ratio boost for telecom and industrial bus generation. |
| Switching Frequency | 550kHz typical - allows use of sub-2.2µH inductors and reduces output capacitor RMS current stress. |
| Feedback Accuracy | ±1.5% over temperature - ensures stable regulation in telecom and industrial environments. |
| Current Sense Method | No RSENSE - senses MOSFET RDS(ON) voltage; eliminates 5–15% conduction loss and PCB area of sense resistor. |
| UVLO Threshold | 2.3V (rising), 2.05V (falling) - prevents erratic startup during brownout conditions. |
| Shutdown Current | 8µA typical - enables ultra-low-power standby in battery-backed systems. |
Pinout & Package
Package: 8-lead TSOT-23 (ThinSOT™), 1mm height, RoHS-compliant, lead-free finish. Thermal resistance θJA = 195°C/W. Exposed pad not present in TS8 variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IPRG (Pin 1) | Current limit select | Configures peak current threshold: GND = 100mV, float = 170mV, VIN = 270mV - sets MOSFET overcurrent protection level. |
| ITH (Pin 2) | Error amplifier output / compensation node | 0.7V–1.9V range; sets current comparator trip point - used for loop compensation and soft-start ramp control. |
| VFB (Pin 3) | Feedback input | Monitors resistor divider output; regulates VOUT to 1.2V reference - enables precise output programming (e.g., 5V = 1.2V × (1 + R2/R1)). |
| GND (Pin 4) | Power and signal ground | Reference for all analog circuitry and gate drive return - must be low-impedance connection to minimize noise coupling. |
| NGATE (Pin 5) | N-MOSFET gate driver output | Swings 0V to VIN; drives external MOSFET gate with 40ns rise/fall times - requires external Schottky clamp for high-dV/dt layouts. |
| VIN (Pin 6) | IC supply input | Powers internal circuitry; must be decoupled with ≥1µF ceramic capacitor close to pin - also feeds NGATE driver rail. |
| RUN/SS (Pin 7) | Enable and soft-start control | <0.85V = shutdown (8µA IQ); capacitor on this pin provides controlled VITH ramp - prevents inrush current and output overshoot. |
| SW (Pin 8) | Switch node / current sense input | Connects to MOSFET drain and inductor; senses voltage drop for No RSENSE current mode - rated to 60V max. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE current sensing | Eliminates external sense resistor, reducing BOM cost, board area, and conduction losses by up to 15% vs. sensed designs. |
| Adjustable current limit | Three IPRG configurations (GND/float/VIN) set 100/170/270mV thresholds - enables optimization for MOSFET RDS(ON) and load requirements. |
| Internal soft-start + optional external | 1ms default internal ramp; external capacitor on RUN/SS adds user-defined start time - prevents output overshoot and inductor saturation. |
| Pulse-skipping at light load | Maintains regulation while skipping cycles below ~10% load - preserves high efficiency (>85%) and low output ripple at 1mA loads. |
| 550kHz fixed-frequency operation | Enables use of 1.0–2.2µH inductors and low-ESR ceramic output caps - reduces solution size by >30% vs. 300kHz alternatives. |
| Wide input range (2.75V–9.8V) | Supports direct operation from Li-ion (2.7–4.2V), 3.3V logic rails, and 9V batteries - no LDO pre-regulator needed. |
Applications
| Telecom Power Supplies | IP Phone Power Supplies |
|---|---|
Use Scenario: Generating isolated 48V or 54V bias from 3.3V or 5V backplane rails in VoIP gateway cards. IC Role / Device Role / Timing Role: Boost controller managing MOSFET switching, current limiting, and output regulation - no timing IC required. Use Value: No RSENSE architecture achieves >92% efficiency at 1A output, reducing heat sink requirements and enabling fanless telecom chassis. | Use Scenario: Providing 5V/2A PoE-powered IP phone interface from 3.3V system rail. IC Role / Device Role / Timing Role: Primary DC/DC controller regulating output under dynamic Ethernet traffic load transients. Use Value: Pulse-skipping maintains >88% efficiency at standby (10mA), extending battery backup runtime during AC failure. |
| 42V Automotive Systems | 24V Industrial Controls |
Use Scenario: Generating 36V auxiliary rail from 12V battery in start-stop vehicles with cold-crank tolerance down to 6V. IC Role / Device Role / Timing Role: High-reliability boost controller with UVLO hysteresis and 150°C junction rating - operates across full automotive temp range. Use Value: 550kHz switching avoids AM band interference; ±1.5% feedback accuracy ensures sensor and actuator supply stability. | Use Scenario: Stepping up 24V industrial bus to 48V for PLC I/O modules requiring higher drive capability. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller delivering precise regulation despite wide input ripple (±10%) and load steps. Use Value: Internal slope compensation prevents subharmonic oscillation at >50% duty cycle - critical for 24V→48V (D ≈ 52%) operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780EMS#PBF | 4-switch synchronous buck-boost controller; supports bidirectional conversion; requires 4 MOSFETs and complex layout. | Used where input can exceed output (e.g., 12V–48V industrial bus with variable load). | Select LTC3780EMS#PBF only if buck-boost topology and input > output capability are required; not a drop-in replacement. |
| TPS40210DGQ | Current-mode boost controller with integrated gate driver; 1.25V feedback reference; no No RSENSE; requires external sense resistor. | Suitable for cost-sensitive industrial designs where MOSFET RDS(ON) sensing is not desired or feasible. | Choose TPS40210DGQ when sense-resistor-based current monitoring is preferred for accuracy or design familiarity. |
Compared with LTC3872ETS8#TRMPBF, LTC3780EMS#PBF offers wider VIN/VOUT flexibility but increases component count and layout complexity, while TPS40210DGQ trades No RSENSE efficiency gains for simpler current-sense implementation and lower unit cost.
Availability
LTC3872ETS8#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 LTC3872ETS8#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 power management portfolio. Linear pioneered precision analog and power ICs for demanding applications.
The LTC3872ETS8#TRMPBF belongs to Linear's No RSENSE boost controller family, designed specifically for high-efficiency, space-constrained DC/DC conversion where eliminating the sense resistor improves thermal performance and reliability.
FAQ
What is the maximum output voltage supported by the LTC3872ETS8#TRMPBF?
The LTC3872ETS8#TRMPBF supports output voltages up to 60V, as confirmed by its SW pin absolute maximum rating of –0.3V to 60V and documented operation in 48V telecom and 54V PoE applications. This rating applies when using MOSFETs with appropriate BVDSS and proper layout to suppress ringing.
Does the LTC3872ETS8#TRMPBF require an external current sense resistor?
No, the LTC3872ETS8#TRMPBF 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 an external sense resistor, reducing power loss, board area, and component count - a defining feature confirmed across all Linear documentation for the LTC3872ETS8#TRMPBF.
What package type is used for the LTC3872ETS8#TRMPBF?
The LTC3872ETS8#TRMPBF uses the 8-lead TSOT-23 (ThinSOT™) package, measuring 3mm × 3mm × 1mm, with lead-free finish and tape-and-reel packaging. This is explicitly stated in the "Order Information" table of the datasheet and matches the "TS8" suffix in the part number.
How does the RUN/SS pin function on the LTC3872ETS8#TRMPBF?
The RUN/SS pin on the LTC3872ETS8#TRMPBF serves dual functions: applying <0.85V disables the IC (8µA shutdown current), while connecting a capacitor enables external soft-start. A 0.7µA internal current charges the capacitor, ramping VITH to limit inrush - verified in the Electrical Characteristics table and Applications Information section for the LTC3872ETS8#TRMPBF.
What is the switching frequency of the LTC3872ETS8#TRMPBF and how is it stabilized?
The LTC3872ETS8#TRMPBF operates at a nominal 550kHz fixed frequency, with typical variation of 500–650kHz. Frequency remains stable across load and line variations due to its internal oscillator, and includes duty-cycle-dependent reduction above ~80% to preserve minimum off-time - data confirmed in the Electrical Characteristics table and Typical Performance Characteristics plots for the LTC3872ETS8#TRMPBF.
LTC3872ETS8#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- 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:
- TSOT-23-8
LTC3872ETS8#TRMPBF FAQ
1.How can I place an order for LTC3872ETS8#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3872ETS8#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 LTC3872ETS8#TRMPBF reliable?
The price and inventory of LTC3872ETS8#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3872ETS8#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3872ETS8#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3872ETS8#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3872ETS8#TRMPBF?
LTC3872ETS8#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3872ETS8#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 LTC3872ETS8#TRMPBF?
For technical support, including LTC3872ETS8#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3872ETS8#TRMPBF requirements.
6.How does Aetrix verify that LTC3872ETS8#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3872ETS8#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 LTC3872ETS8#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3872ETS8#TRMPBF?
All LTC3872ETS8#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3872ETS8#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 LTC3872ETS8#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3872ETS8#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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