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Analog Devices Inc. LTC3872ITS8#TRMPBF
- Part No.:
- LTC3872ITS8#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC3872ITS8#TRMPBF.pdf
- Description:
- IC REG CTRLR BOOST TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:729
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Product details
Overview
LTC3872ITS8#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 3.3V-to-5V/2A telecom power supplies.
For engineers reviewing the LTC3872ITS8#TRMPBF datasheet, LTC3872ITS8#TRMPBF pinout, LTC3872ITS8#TRMPBF application, or LTC3872ITS8#TRMPBF equivalent, key selection considerations include No RSENSE™ operation, IPRG-selectable current limit (65–290mV), –40°C to 125°C junction temperature rating, TSOT-23-8 package thermal resistance (θJA = 195°C/W), and internal soft-start with optional external capacitor control.
Technical Context
The LTC3872ITS8#TRMPBF implements a No RSENSE™ current sensing architecture that measures voltage drop across the MOSFET's RDS(ON) instead of a discrete shunt, eliminating power loss and board space. 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 pulse-skipping at light load for high efficiency, and features undervoltage lockout (UVLO) with 2.3V rising threshold and 2.05V falling hysteresis. The RUN/SS pin enables shutdown (8µA IQ) and external soft-start via 0.7µA trickle charge.
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 automotive 5V/12V derived inputs. |
| Output Voltage Range | Up to 60V - enables high-voltage bias generation for telecom, industrial sensors, and LED drivers. |
| 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 Limit Threshold | 65–290mV (IPRG-configurable) - sets peak inductor current without external resistor, reducing BOM count. |
| Junction Temp Range | –40°C to +125°C - qualified for extended-temperature industrial and automotive under-hood applications. |
| Shutdown Current | 8µA typical - enables low-power standby modes in battery-backed systems. |
Pinout & Package
Package: 8-lead low-profile (1mm) TSOT-23 (ThinSOT™), RoHS-compliant, exposed pad not present (unlike DFN variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IPRG (Pin 1) | Current limit select input | Configures peak current threshold: GND = 65mV, float = 130mV, VIN = 215mV (LTC3872I grade). |
| ITH (Pin 2) | Error amplifier compensation node | 0.7V–1.9V range sets current comparator trip point; used for loop compensation and soft-start ramp. |
| VFB (Pin 3) | Feedback input | Compares divided output voltage to 1.2V internal reference; ±1.5% accuracy enables precise output regulation. |
| GND (Pin 4) | Analog/digital ground | Reference for all internal circuits; requires low-impedance PCB connection to minimize noise coupling. |
| NGATE (Pin 5) | N-MOSFET gate driver output | Drives external MOSFET gate from 0V to VIN; 40ns rise/fall times support high-frequency switching. |
| VIN (Pin 6) | Power supply input | Supplies internal circuitry; must be decoupled with ≥1µF ceramic capacitor close to pin. |
| RUN/SS (Pin 7) | Enable & soft-start control | <0.85V disables IC (8µA IQ); external capacitor enables controlled VITH ramp for inrush current limiting. |
| SW (Pin 8) | Switch node / current sense input | Connects to MOSFET drain and inductor; senses switch-node voltage for No RSENSE™ current measurement (60V max). |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE™ architecture | Eliminates external current-sense resistor, improving efficiency by ~2–3% and saving >2mm² PCB area in 3.3V-to-5V boost designs. |
| Adjustable current limit | Three IPRG states allow optimization of peak current for different MOSFET RDS(ON) values without changing layout. |
| Pulse-skipping at light load | Maintains constant 550kHz operation down to very light loads, minimizing output ripple and audible noise vs. burst-mode alternatives. |
| Internal soft-start + external option | 1ms default ramp prevents inrush current; external capacitor on RUN/SS enables user-defined start-up time for system sequencing. |
| High-voltage SW pin | 60V absolute maximum rating enables direct MOSFET drain sensing in 48V telecom and 24V industrial boost converters. |
Applications
| Telecom Power Supplies | 42V Automotive Systems |
|---|---|
Use Scenario: Generating stable 5V/2A bias from a 3.3V backplane in VoIP phone base stations with strict EMI limits. IC Role / Device Role / Timing Role: Boost controller managing power stage timing, current regulation, and soft-start sequencing. Use Value: No RSENSE™ operation eliminates sense resistor losses, achieving >92% efficiency at full load while meeting FCC Class B conducted emissions. | Use Scenario: Providing isolated 12V auxiliary rail from a 42V stop-start vehicle battery during cold cranking (down to 6V input). IC Role / Device Role / Timing Role: High-reliability boost controller maintaining regulated output despite wide input transients and temperature extremes. Use Value: –40°C to 125°C rating and UVLO hysteresis ensure continuous operation during engine start; 550kHz switching minimizes filter size in space-constrained ECUs. |
| 24V Industrial Controls | IP Phone Power Supplies |
Use Scenario: Converting 24V DC bus to 48V PoE midspan power in factory automation gateways with 100% duty-cycle headroom. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller delivering precise 48V output with fast transient recovery for Ethernet switch ICs. Use Value: Adjustable current limit and internal slope compensation enable stable CCM operation up to 90% duty cycle without external components. | Use Scenario: Local 5V/1.5A power for SIP processor, codec, and Ethernet PHY in desktop IP phones powered from PoE (IEEE 802.3af). IC Role / Device Role / Timing Role: Primary DC/DC controller regulating output voltage, managing startup sequencing, and limiting inrush into bulk capacitance. Use Value: Internal soft-start and pulse-skipping reduce peak input current during boot, preventing PoE PSE disconnect due to overload detection. |
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 pinout and function but rated for 0°C to 85°C junction temperature. | Not suitable for under-hood automotive or extended industrial ambient conditions. | Select only for commercial-temperature applications where cost is prioritized over thermal margin. |
| LT3958IS8#PBF | Wider VIN range (4.5V–100V), integrated 5A MOSFET driver, no IPRG pin; requires external sense resistor. | Supports higher input voltages and higher output currents but adds BOM cost and reduces efficiency vs. No RSENSE™. | Choose when input exceeds 9.8V or when integrated high-current gate drive is required; avoid if 3.3V input operation is needed. |
Compared with LTC3872ETS8#TRPBF, the LTC3872ITS8#TRMPBF provides guaranteed operation to 125°C junction temperature-critical for thermally constrained enclosures-while LT3958IS8#PBF trades No RSENSE™ simplicity for higher voltage capability and integrated drive strength at the cost of added external components and reduced light-load efficiency.
Availability
LTC3872ITS8#TRMPBF is available at Aetrix Electronics and suitable for telecom power supplies, 42V automotive systems, and 24V industrial controls requiring stable component supply with extended temperature qualification and long-term lifecycle support.
Supply support for LTC3872ITS8#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 analog and power management portfolio with rigorous reliability testing and long-term product commitments.
The LTC3872ITS8#TRMPBF 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 where sense-resistor losses are unacceptable.
FAQ
What is the maximum output voltage supported by the LTC3872ITS8#TRMPBF?
The LTC3872ITS8#TRMPBF supports output voltages up to 60V, as confirmed by the SW pin absolute maximum rating of –0.3V to 60V and verified in the Typical Application circuit delivering 5V from 3.3V input. This enables use in 48V telecom bias rails and industrial sensor excitation circuits without level-shifting.
How does the IPRG pin affect current limiting on the LTC3872ITS8#TRMPBF?
The IPRG pin on the LTC3872ITS8#TRMPBF selects one of three peak current thresholds: 65mV (IPRG = GND), 130mV (IPRG = float), or 215mV (IPRG = VIN) for the LTC3872I grade. This directly sets the maximum allowable voltage drop across the external MOSFET's RDS(ON), enabling precise current limiting without external components.
Does the LTC3872ITS8#TRMPBF require an external current-sense resistor?
No, the LTC3872ITS8#TRMPBF uses Linear's No RSENSE™ architecture to sense current via the voltage drop across the external N-channel MOSFET's RDS(ON), eliminating the need for an external sense resistor. This is confirmed in the Features section and Functional Diagram, where SW pin sensing replaces traditional RSENSE placement.
What is the operating temperature range for the LTC3872ITS8#TRMPBF?
The LTC3872ITS8#TRMPBF is specified for a junction temperature range of –40°C to +125°C, as documented in the Order Information table for the "I" grade TS8 package. This is validated by electrical characteristics tested over this full range and thermal derating curves in the datasheet.
Can the LTC3872ITS8#TRMPBF operate with a 3.3V input to generate 5V at 2A?
Yes, the LTC3872ITS8#TRMPBF is explicitly validated for 3.3V-to-5V/2A boost conversion in the Typical Application (Figure TA01), achieving high efficiency with minimal external components. Input voltage range (2.75V–9.8V) and output capability (up to 60V) fully cover this use case.
LTC3872ITS8#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LTC3872ITS8#TRMPBF FAQ
1.How can I place an order for LTC3872ITS8#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3872ITS8#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 LTC3872ITS8#TRMPBF reliable?
The price and inventory of LTC3872ITS8#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3872ITS8#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3872ITS8#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3872ITS8#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3872ITS8#TRMPBF?
LTC3872ITS8#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3872ITS8#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 LTC3872ITS8#TRMPBF?
For technical support, including LTC3872ITS8#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3872ITS8#TRMPBF requirements.
6.How does Aetrix verify that LTC3872ITS8#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3872ITS8#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 LTC3872ITS8#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3872ITS8#TRMPBF?
All LTC3872ITS8#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3872ITS8#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 LTC3872ITS8#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3872ITS8#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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