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Analog Devices Inc. LTC1871HMS#TRPBF
- Part No.:
- LTC1871HMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1871HMS#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:907
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Product details
Overview
LTC1871HMS#TRPBF from Analog Devices (formerly Linear Technology) is a wide-input, current-mode DC/DC controller for boost, flyback, and SEPIC topologies, driving an external N-channel MOSFET without requiring a discrete sense resistor. It operates from 2.5V to 36V input, delivers up to 92% duty cycle, supports 50kHz–1MHz programmable switching frequency, and features Burst Mode® operation for <10μA shutdown current-ideal for battery-powered telecom and portable power supplies.
For engineers reviewing the LTC1871HMS#TRPBF datasheet, LTC1871HMS#TRPBF pinout, LTC1871HMS#TRPBF application, or LTC1871HMS#TRPBF equivalent, key selection criteria include its no-RSENSE™ current sensing via MOSFET RDS(ON), ±2% RUN pin threshold with 100mV hysteresis, internal 5.2V LDO, output overvoltage protection, and H-grade temperature rating (–40°C to +150°C).
Technical Context
The LTC1871HMS#TRPBF implements constant-frequency current-mode control using slope-compensated PWM, where the ITH pin voltage sets the peak inductor current threshold. Its SENSE pin supports dual sensing methods: direct VDS sensing across the MOSFET (for ≤36V output) or shunt-resistor-based sensing in the source path (for higher output voltages).
Operating mode is selected via the MODE/SYNC pin: grounded for Burst Mode® (micropower light-load operation), tied to INTVCC for pulse-skip mode (fixed-frequency DCM), or driven by an external clock up to 1.3×fOSC for synchronized noise control. The internal 1.230V reference and error amplifier provide tight output regulation with ±1% accuracy over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 36V - supports wide-range industrial and automotive battery inputs without pre-regulation. |
| Max Duty Cycle | 92% typical - enables high step-up ratios in boost and flyback configurations. |
| Switching Frequency | 50kHz to 1MHz, set by single RT resistor - balances efficiency vs. size; synchronizable to external clock. |
| Shutdown Quiescent Current | 10μA typical - extends battery life in always-on portable systems. |
| Feedback Reference Voltage | 1.230V ±1% - ensures precise output voltage setting with minimal divider error. |
| Run Pin Threshold Hysteresis | 100mV - prevents oscillation during brown-in/brown-out transitions. |
| Operating Temperature Range | –40°C to +150°C (H-grade) - qualified for under-hood automotive and high-ambient industrial use. |
| Package | 10-lead MSOP - compact footprint with thermal pad for enhanced power dissipation. |
Pinout & Package
Package: 10-lead plastic MSOP (10-Lead Plastic MSOP), exposed pad for thermal enhancement, θJA = 120°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 1) | Enable/UVLO input | Starts converter when VIN exceeds 1.348V; shuts down below 1.248V with 100mV hysteresis for noise immunity. |
| ITH (Pin 2) | Error amplifier output | Sets current comparator threshold; 0.3V–1.4V range controls peak inductor current and load transient response. |
| FB (Pin 3) | Feedback input | Compares output divider voltage to 1.230V reference; determines regulated output voltage. |
| FREQ (Pin 4) | Oscillator programming | 0.62V nominal voltage; RT resistor to GND sets fOSC from 50kHz to 1MHz. |
| MODE/SYNC (Pin 5) | Mode control / sync input | GND = Burst Mode®; INTVCC = pulse-skip; external clock = synchronization up to 1.3×fOSC. |
| GND (Pin 6) | Power and signal ground | Reference for all analog circuits and gate driver return path. |
| GATE (Pin 7) | MOSFET gate driver output | Drives N-channel MOSFET gate with 17ns rise / 8ns fall time into 3.3nF load. |
| INTVCC (Pin 8) | Internal LDO output | 5.2V ±2.5%, powers gate driver and logic; requires ≥4.7μF local ceramic/tantalum bypass. |
| VIN (Pin 9) | Main supply input | Primary power input (2.5V–36V); powers internal bias and feeds INTVCC LDO when VIN > 7V. |
| SENSE (Pin 10) | Current sense input | Accepts VDS (MOSFET drain) or shunt voltage (source); max 180mV threshold, with leading-edge blanking. |
Key Features
| Feature | Design Value |
|---|---|
| No-RSENSE™ current sensing | Eliminates power loss and board space of external sense resistor by using MOSFET RDS(ON) - improves efficiency by up to 3% at medium loads. |
| Programmable Burst Mode® | Reduces light-load IQ to 250μA and enables sleep-mode operation - critical for >100-hour battery runtime in standby applications. |
| High-accuracy RUN pin UVLO | ±2% threshold tolerance with 100mV hysteresis - enables reliable cold-cranking start-up in automotive systems. |
| Output overvoltage protection | Detects FB > 6.5% above 1.230V and forces immediate latch-off - prevents damage to downstream 5V/3.3V logic rails. |
| H-grade temperature qualification | Specified and guaranteed from –40°C to +150°C junction - suitable for engine-control modules and industrial motor drives. |
| Internal 5.2V LDO | Supplies gate driver and logic with 50mA capability - eliminates need for external bias supply in most designs. |
Applications
| Telecom Power Supplies | Portable Medical Devices |
|---|---|
Use Scenario: 48V intermediate bus conversion to isolated 5V/3.3V rails in base station remote radio units. IC Role / Device Role / Timing Role: Flyback controller managing primary-side regulation and synchronous rectification timing. Use Value: No-RSENSE™ sensing reduces heat generation in sealed enclosures; 150°C rating ensures reliability in unventilated outdoor cabinets. |
Use Scenario: Battery-powered ultrasound handheld with 3.7V Li-ion input and 12V transducer driver rail. IC Role / Device Role / Timing Role: Boost controller delivering regulated 12V at up to 1A with low-noise pulse-skip mode during imaging bursts. Use Value: 10μA shutdown current extends battery life between scans; 92% duty cycle enables 12V output from depleted 3.0V cell. |
| Automotive Infotainment Systems | Industrial IoT Sensors |
Use Scenario: Start-stop compatible 12V-to-5V conversion for head unit display backlight and USB ports. IC Role / Device Role / Timing Role: SEPIC controller maintaining regulation during cold-crank dips to 3.5V. Use Value: RUN pin hysteresis prevents flicker during 6V–16V transients; H-grade rating survives under-dash ambient up to 105°C. |
Use Scenario: Solar-charged wireless sensor node requiring 3.3V from variable 2.8V–4.2V supercapacitor input. IC Role / Device Role / Timing Role: Low-VIN boost controller operating in Burst Mode® to minimize quiescent draw. Use Value: 2.5V minimum start-up enables harvest from weak solar conditions; 250μA Burst Mode IQ preserves months of shelf life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost/flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3757EMSE#TRPBF | Higher 100V VIN max, integrated high-side gate driver, no internal LDO - requires external bias supply. | Better suited for 48V+ industrial flyback; lacks no-RSENSE™ and Burst Mode® optimization for sub-100μA loads. | Select when input exceeds 36V or synchronous rectification timing is required; not drop-in due to different pinout and bias architecture. |
| TPS40210DGQ | TI part with 4.5V–52V input, fixed 500kHz fOSC, no programmable frequency or Burst Mode® - higher 1.5mA no-load IQ. | Targeted at cost-sensitive industrial SMPS; lacks H-grade temp rating and precision RUN threshold. | Choose for fixed-frequency, non-battery applications where 150°C operation and micropower shutdown are not required. |
Compared with LT3757EMSE#TRPBF and TPS40210DGQ, the LTC1871HMS#TRPBF uniquely combines no-RSENSE™ efficiency, programmable Burst Mode®, and guaranteed 150°C operation - making it the only option for compact, high-temp, ultra-low-IQ boost/flyback designs.
Availability
LTC1871HMS#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, portable medical devices, automotive infotainment systems, and industrial IoT sensors requiring stable component supply across extended temperature ranges.
Supply support for LTC1871HMS#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC1871HMS#TRPBF belongs to Linear's legacy high-efficiency DC/DC controller product line, designed specifically for low-to-medium power boost, flyback, and SEPIC converters where efficiency, small size, and wide temperature operation are critical.
FAQ
What is the maximum input voltage supported by the LTC1871HMS#TRPBF?
The LTC1871HMS#TRPBF supports an absolute maximum input voltage of 36V on the VIN pin, with continuous operation specified from 2.5V to 36V. Exceeding 36V may cause permanent damage. For applications requiring >36V input, consider alternative controllers such as the LT3757EMSE#TRPBF, which supports up to 100V.
Does the LTC1871HMS#TRPBF require an external current sense resistor?
No, the LTC1871HMS#TRPBF implements No-RSENSE™ technology, using the power MOSFET's RDS(ON) for current sensing - eliminating the need for an external sense resistor and associated power loss. However, for output voltages exceeding 36V, a shunt resistor in the MOSFET source path can be used via the SENSE pin.
What is the purpose of the MODE/SYNC pin on the LTC1871HMS#TRPBF?
The MODE/SYNC pin on the LTC1871HMS#TRPBF selects operating mode: grounded for Burst Mode® (ultra-low IQ at light loads), tied to INTVCC for pulse-skip mode (fixed-frequency DCM), or driven by an external clock for synchronization up to 1.3×fOSC. It also provides internal 50kΩ pull-down when left open.
How does the RUN pin function in the LTC1871HMS#TRPBF?
The RUN pin on the LTC1871HMS#TRPBF provides accurate enable/disable control with a rising threshold of 1.348V and falling threshold of 1.248V (100mV hysteresis). When below threshold, the IC enters shutdown with 10μA typical IQ. It remains active even in shutdown, enabling reliable cold-crank detection in automotive systems.
What package type and thermal characteristics does the LTC1871HMS#TRPBF have?
The LTC1871HMS#TRPBF uses a 10-lead MSOP package with exposed thermal pad. Its junction-to-ambient thermal resistance (θJA) is 120°C/W. The H-grade version is fully specified from –40°C to +150°C junction temperature, with guaranteed performance and reliability across that full range.
LTC1871HMS#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 or Negative
- 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:
- Enable, Frequency Control
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC1871HMS#TRPBF FAQ
1.How can I place an order for LTC1871HMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1871HMS#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 LTC1871HMS#TRPBF reliable?
The price and inventory of LTC1871HMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1871HMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1871HMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1871HMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1871HMS#TRPBF?
LTC1871HMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1871HMS#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 LTC1871HMS#TRPBF?
For technical support, including LTC1871HMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1871HMS#TRPBF requirements.
6.How does Aetrix verify that LTC1871HMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1871HMS#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 LTC1871HMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1871HMS#TRPBF?
All LTC1871HMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1871HMS#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 LTC1871HMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC1871HMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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