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Analog Devices Inc. LTC1871XMS#TRPBF
- Part No.:
- LTC1871XMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1871XMS#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,172
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Product details
Overview
LTC1871XMS#TRPBF from Analog Devices (formerly Linear Technology) is a wide-input, current-mode DC/DC controller IC for boost, flyback, and SEPIC topologies, driving an external N-channel MOSFET. It operates from 2.5V to 36V input, delivers up to 92% duty cycle, features No RSENSE™ sensing via MOSFET RDS(ON), and is fully rated and tested at 175°C junction temperature - enabling use in high-temperature industrial and automotive power supplies.
For engineers reviewing the LTC1871XMS#TRPBF datasheet, LTC1871XMS#TRPBF pinout, LTC1871XMS#TRPBF application, or LTC1871XMS#TRPBF equivalent, key selection criteria include its 175°C operation rating, programmable 65–900 kHz switching frequency, Burst Mode® for ultra-low-light-load IQ (250 µA), ±2% FB reference accuracy, and integrated 5.2 V LDO for gate driver supply.
Technical Context
The LTC1871XMS#TRPBF implements peak current-mode control with internal slope compensation, supporting stable operation up to 92% duty cycle and preventing subharmonic oscillation above 50% duty cycle. Its No RSENSE™ architecture senses current via the MOSFET's intrinsic RDS(ON), eliminating external sense resistors and maximizing efficiency in low-to-medium power converters.
It integrates a micropower RUN comparator (1.248 V threshold, 100 mV hysteresis), a programmable oscillator (resistor-set from 65 kHz to 900 kHz), and a MODE/SYNC pin that enables Burst Mode®, continuous pulse-skip, or external clock synchronization up to 1.3× fOSC. The ITH pin serves as the error amplifier output and directly modulates current comparator threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5 V to 36 V - supports wide-range battery and industrial bus inputs without pre-regulation. |
| Max Junction Temperature | 175°C - fully tested and guaranteed; enables deployment in under-hood, downhole, or enclosed high-temp environments. |
| Switching Frequency Range | 65 kHz to 900 kHz - set by single resistor on FREQ pin; allows tradeoff between efficiency and magnetics size. |
| Max Duty Cycle | 92% typical - enables high step-up ratios (e.g., 5 V → 12 V or higher) in boost/flyback/SEPIC configurations. |
| FB Reference Voltage | 1.230 V ±12 mV (±2%) - high-accuracy feedback reference ensures tight output voltage regulation across temperature. |
| Shutdown Quiescent Current | 10 µA typical - enables long battery life in always-on systems with enable-controlled power sequencing. |
| Burst Mode IQ (no load) | 250 µA typical - reduces light-load losses while maintaining regulation via controlled burst pulses. |
| INTVCC Regulator | 5.2 V ±0.2 V LDO - powers gate driver and internal logic; supplies up to 50 mA with 280 mV dropout at 20 mA load. |
Pinout & Package
Package: 10-lead MSOP (10-Lead Plastic MSOP), exposed pad not present; thermal resistance θJA = 120°C/W; rated for –40°C to +175°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 1) | Enable/UVLO Input | Accurate micropower comparator with 1.248 V falling threshold and 100 mV hysteresis; controls startup/shutdown without external circuitry. |
| ITH (Pin 2) | Error Amplifier Output | Controls current comparator threshold; voltage range 0–1.4 V; clamped at 0.525 V in Burst Mode to limit minimum load current. |
| FB (Pin 3) | Feedback Input | Compares output divider voltage against 1.230 V reference; ±2% accuracy over full temperature range ensures stable regulation. |
| FREQ (Pin 4) | Oscillator Programming | Accepts resistor-to-ground to set switching frequency; nominal pin voltage 0.62 V; enables 65–900 kHz range. |
| MODE/SYNC (Pin 5) | Mode Control / Clock Sync | Ground = Burst Mode; INTVCC or >2 V = continuous/pulse-skip; external clock up to 1.3× fOSC enables EMI control. |
| GND (Pin 6) | Power Ground | Common return for all analog and power circuits; must be low-impedance connection to minimize noise coupling. |
| GATE (Pin 7) | MOSFET Gate Driver Output | High-current push-pull driver (17 ns rise, 8 ns fall into 3.3 nF); drives N-channel MOSFET gate directly. |
| INTVCC (Pin 8) | Internal LDO Output | 5.2 V regulated supply for gate driver and logic; requires ≥4.7 µF local ceramic/tantalum bypass to GND. |
| VIN (Pin 9) | Main Power Input | Supplies bias and startup circuitry; decoupled locally; supports 2.5–36 V; powers INTVCC LDO when VIN > 7 V. |
| SENSE (Pin 10) | Current Sense Input | Accepts VDS of power MOSFET (No RSENSE™) or source-shunt resistor; internal blanking prevents false triggering on switching edges. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE™ Current Sensing | Eliminates external sense resistor by using MOSFET RDS(ON), reducing BOM count, board space, and conduction losses - especially critical in high-efficiency, low-voltage applications. |
| 175°C Fully Rated Operation | Every unit tested at 175°C junction temperature; guarantees functionality and reliability in extreme environments where standard controllers fail. |
| Programmable Burst Mode® | User-selectable via MODE/SYNC pin; reduces no-load IQ to 250 µA while maintaining regulation - extends battery runtime in portable equipment. |
| Wide 65–900 kHz Frequency Range | Single external resistor sets frequency; enables optimization for EMI compliance, transformer size, or efficiency in diverse power architectures. |
| Integrated 5.2 V LDO with 50 mA Drive | Powers gate driver and internal logic; eliminates need for external bias supply; includes dropout protection and line/load regulation specs. |
| Output Overvoltage Protection | Detects FB > 1.230 V + 6.5% and forces latch-off of GATE; provides hardware-level safety for downstream loads and capacitors. |
Applications
| Telecom Power Supplies | Portable Electronic Equipment |
|---|---|
|
Use Scenario: 48 V telecom brick supplying isolated 12 V/5 V rails in base station subsystems with ambient temperatures up to 85°C and transient thermal spikes. IC Role / Device Role / Timing Role: Primary-side current-mode controller in non-isolated boost stage; regulates intermediate bus with fast transient response and high-duty-cycle capability. Use Value: 175°C rating ensures reliable operation during thermal stress events; No RSENSE™ improves efficiency by eliminating ~0.5 W sense resistor loss at 5 A. |
Use Scenario: USB-C PD power bank delivering 5 V/3 A from single-cell Li-ion (2.7–4.2 V) with minimal standby drain. IC Role / Device Role / Timing Role: Boost controller managing battery-to-5 V conversion; uses Burst Mode® to maintain <10 µA system sleep current. Use Value: 10 µA shutdown IQ and 250 µA Burst Mode IQ extend shelf life and runtime; 2.5 V min input enables deep battery discharge utilization. |
| Industrial Motor Drives (Auxiliary PSU) | Automotive Infotainment Power |
|
Use Scenario: Auxiliary 12 V → 24 V boost supply powering gate drivers and isolation bias in servo drive inverters mounted near motors. IC Role / Device Role / Timing Role: High-reliability boost controller in harsh vibration/temperature environment; operates continuously at 70°C ambient with 105°C case temp. Use Value: Guaranteed 175°C operation avoids derating or forced cooling; 92% max duty cycle enables efficient 12 V → 24 V conversion without cascaded stages. |
Use Scenario: Head unit power supply deriving 5 V/3.3 V from 9–16 V automotive battery with cold-crank tolerance down to 4.5 V. IC Role / Device Role / Timing Role: Pre-regulator boosting battery voltage to stable intermediate rail before LDOs; withstands load dump transients via 36 V absolute max rating. Use Value: 36 V absolute max VIN and robust RUN UVLO (1.248 V threshold) ensure startup during cranking; integrated OVP protects downstream SoC from overvoltage faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost/flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3757AEMSE#TRPBF | Wider 2.8–100 V input; includes soft-start and fault flag; no 175°C rating; requires external sense resistor. | Better suited for high-input industrial HVDC or PoE++ systems; lacks high-temp qualification for under-hood use. | Select LT3757A if input exceeds 36 V or fault reporting is required; avoid if 175°C operation or No RSENSE™ is mandatory. |
| TPS40210DGQR | Lower 4.5–52 V input; 130°C max junction; fixed 1.25 V FB reference; no Burst Mode; higher 2.5 mA quiescent current. | Cost-optimized for consumer-grade 12 V input systems; insufficient for extended temperature or ultra-low-power battery apps. | Choose TPS40210 only for cost-sensitive, non-extreme-temp designs where 10 µA shutdown IQ is unnecessary. |
Compared with LT3757AEMSE#TRPBF and TPS40210DGQR, the LTC1871XMS#TRPBF uniquely combines 175°C operation, No RSENSE™ sensing, and sub-µA shutdown IQ - making it irreplaceable in high-reliability, thermally constrained, or battery-sensitive boost/flyback designs.
Availability
LTC1871XMS#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, portable electronic equipment, industrial motor drive auxiliary PSUs, and automotive infotainment power requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC1871XMS#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision, industrial, automotive, and communications markets.
The LTC1871XMS#TRPBF belongs to Linear's high-temperature power controller family, designed specifically for ruggedized DC/DC conversion in environments where standard ICs fail - including oil & gas, aerospace, and automotive under-hood applications.
FAQ
What is the maximum operating junction temperature of the LTC1871XMS#TRPBF?
The LTC1871XMS#TRPBF is fully rated and 100% tested at 175°C junction temperature, with guaranteed operation across –40°C to +175°C. This specification is validated per datasheet Note 2 and Absolute Maximum Ratings table, making it suitable for high-temperature industrial and automotive applications where conventional controllers derate or fail.
How does the No RSENSE™ feature work in the LTC1871XMS#TRPBF?
The LTC1871XMS#TRPBF implements No RSENSE™ by sensing the voltage drop across the power MOSFET's RDS(ON) via the SENSE pin connected to the MOSFET drain. This eliminates the need for an external current-sense resistor, reducing power loss, BOM cost, and PCB area. It is optimized for VSW < 36 V; for higher output voltages, connect SENSE to a source shunt resistor instead.
Can the LTC1871XMS#TRPBF synchronize to an external clock, and what are the limits?
Yes, the LTC1871XMS#TRPBF can synchronize to an external clock applied to the MODE/SYNC pin. It locks to frequencies from 100% to 130% of its nominal oscillator frequency (e.g., 300 kHz IC → up to 390 kHz sync). The external signal must exceed 2 V for ≥25 ns and have ≤80% duty cycle. Exceeding 1.3× fOSC risks inadequate slope compensation and subharmonic oscillation.
What is the purpose of the RUN pin on the LTC1871XMS#TRPBF, and how is it configured?
The RUN pin on the LTC1871XMS#TRPBF provides accurate, micropower UVLO with a 1.248 V falling threshold and 100 mV hysteresis. It enables programmable turn-on/turn-off using a resistor divider from VIN. For "always-on" use, connect RUN to VIN through a 1 MΩ resistor. The pin remains active in shutdown, drawing only 10 µA total device current when disabled.
Does the LTC1871XMS#TRPBF support flyback and SEPIC topologies, and what design considerations apply?
Yes, the LTC1871XMS#TRPBF supports flyback and SEPIC topologies in addition to boost. For flyback, configure transformer primary as inductor and secondary as output rectifier; for SEPIC, add coupling capacitor between input and switch node. In both cases, connect SENSE to MOSFET source via shunt resistor (not drain) to avoid exceeding 36 V pin rating and enable precise peak-current control.
LTC1871XMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, Flyback, SEPIC
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 2.5V ~ 36V
- Frequency - Switching:
- 50kHz ~ 1MHz
- Duty Cycle (Max):
- 92%
- Synchronous Rectifier:
- No
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Frequency Control
- Operating Temperature:
- -40°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC1871XMS#TRPBF FAQ
1.How can I place an order for LTC1871XMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1871XMS#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 LTC1871XMS#TRPBF reliable?
The price and inventory of LTC1871XMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1871XMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1871XMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1871XMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1871XMS#TRPBF?
LTC1871XMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1871XMS#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 LTC1871XMS#TRPBF?
For technical support, including LTC1871XMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1871XMS#TRPBF requirements.
6.How does Aetrix verify that LTC1871XMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1871XMS#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 LTC1871XMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1871XMS#TRPBF?
All LTC1871XMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1871XMS#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 LTC1871XMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC1871XMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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