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Analog Devices Inc. LTC1871IMS#TRPBF
- Part No.:
- LTC1871IMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1871IMS#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,224
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Product details
Overview
LTC1871IMS#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 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 LTC1871IMS#TRPBF datasheet, LTC1871IMS#TRPBF pinout, LTC1871IMS#TRPBF application, or LTC1871IMS#TRPBF equivalent, key selection criteria include its no-RSENSE current sensing via MOSFET RDS(ON), ±2% RUN threshold with 100mV hysteresis, 1.230V internal reference accuracy, INTVCC LDO output regulation, and MODE/SYNC pin-controlled burst vs. pulse-skip mode behavior.
Technical Context
The LTC1871IMS#TRPBF implements a constant-frequency, current-mode control architecture with slope compensation and leading-edge blanking for stable operation across boost/flyback/SEPIC configurations. Its error amplifier drives the ITH pin (0.3V–1.4V range) to modulate peak inductor current, while the SENSE pin accepts either VDS sensing (for efficiency) or source-resistor sensing (for >36V outputs).
It integrates a 5.2V low-dropout regulator (INTVCC) capable of sourcing 50mA, supports external clock synchronization up to 1.3×fOSC, and includes overvoltage protection triggered at +6.5% FB excursion. The RUN pin provides micropower enable/disable with 1.248V falling threshold and 100mV hysteresis, ensuring robust start-up under varying input conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 36V - supports single-cell Li-ion up to 24V industrial rails without external regulators. |
| Switching Frequency | 50kHz to 1MHz - set by one external resistor; enables trade-off between efficiency (low f) and size (high f). |
| Max Duty Cycle | 92% typical - allows high step-up ratios in boost mode (e.g., 3.3V → 12V) with margin for diode drop. |
| Feedback Reference | 1.230V ±1% - precise output voltage setting with minimal divider error impact on regulation accuracy. |
| Shutdown Current | 10μA typical - extends battery life in always-on systems with infrequent wake-up cycles. |
| INTVCC Output | 5.2V ±0.2V - powers gate driver and logic; requires ≥4.7μF local ceramic/tantalum bypass for transient load handling. |
| RUN Threshold Hysteresis | 100mV - prevents chatter during brown-in/brown-out transitions near turn-on voltage. |
Pinout & Package
Package: 10-lead MSOP (3mm × 3mm), rated for –40°C to +125°C operating temperature (I-grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (1) | Enable/UVLO input | Starts converter when VIN exceeds 1.348V; shuts down below 1.248V with 100mV hysteresis for noise immunity. |
| ITH (2) | Error amplifier output | 0.3V–1.4V control voltage sets current comparator threshold; used for loop compensation. |
| FB (3) | Feedback input | Compares output divider voltage to 1.230V reference; regulates output within ±1% accuracy. |
| FREQ (4) | Oscillator programming | Resistor-to-ground sets fOSC; nominal pin voltage is 0.62V; enables 50kHz–1MHz tuning. |
| MODE/SYNC (5) | Mode control / sync input | Ground = Burst Mode; INTVCC = pulse-skip; external clock = synchronized operation up to 1.3×fOSC. |
| GND (6) | Power and signal ground | Common return for all analog and power paths; must be low-impedance connection to minimize noise. |
| GATE (7) | MOSFET driver output | Drives N-channel gate with 17ns rise / 8ns fall time into 3300pF; supports high-side switch in boost/flyback. |
| INTVCC (8) | LDO output | 5.2V supply for internal circuitry and gate driver; requires ≥4.7μF local bypass capacitor. |
| VIN (9) | Main power input | Supplies bias current and powers internal circuits; must be decoupled close to pin with low-ESR capacitor. |
| SENSE (10) | Current sense input | Accepts VDS (MOSFET drain) for no-RSENSE operation or source-shunt resistor for >36V outputs; includes blanking. |
Key Features
| Feature | Design Value |
|---|---|
| No-RSENSE current sensing | Uses MOSFET RDS(ON) instead of discrete shunt, eliminating 0.5–2W loss and improving full-load efficiency by 2–4%. |
| Programmable Burst Mode | Reduces light-load IQ to 250μA and enables sleep mode below 0.3V ITH, extending battery runtime in standby. |
| Synchronization capability | Accepts external clock up to 1.3× nominal fOSC on MODE/SYNC pin, enabling EMI reduction via fixed-frequency noise shaping. |
| Overvoltage protection | Shuts down GATE if FB exceeds reference by 6.5%, preventing damage to downstream loads during regulation fault. |
| Wide temperature grade | I-grade rating (–40°C to +125°C) ensures reliable operation in automotive cabin, industrial PLC, and telecom equipment environments. |
Applications
| Telecom Power Supplies | Portable Electronic Equipment |
|---|---|
Use Scenario: 48V intermediate bus conversion to 5V/3.3V for base station RF modules and optical transceivers. IC Role / Device Role / Timing Role: Primary controller for isolated flyback or non-isolated boost converters delivering regulated outputs with tight line/load regulation. Use Value: 92% max duty cycle and 36V input support enable direct 48V-to-5V conversion without pre-regulation stages, reducing BOM count and board area. | Use Scenario: Single-cell Li-ion (2.7–4.2V) to 5V USB power bank or portable medical monitor supply. IC Role / Device Role / Timing Role: Boost controller managing battery discharge curve while maintaining stable 5V output across full SOC range. Use Value: 2.5V minimum start-up and 10μA shutdown current maximize usable battery capacity and extend shelf life. |
| Industrial Sensor Nodes | Automotive Infotainment Displays |
Use Scenario: 12V vehicle battery or 24V rail powering low-power wireless sensor transmitters with intermittent wake-up. IC Role / Device Role / Timing Role: SEPIC controller providing regulated 3.3V for MCU and radio ICs despite wide input variation and load transients. Use Value: RUN pin UVLO hysteresis prevents cycling during engine cranking dips; Burst Mode maintains μA-level quiescent draw during sleep. | Use Scenario: 12V automotive supply stepping up to 19V for LCD backlight drivers in head units or digital dashboards. IC Role / Device Role / Timing Role: High-duty-cycle boost controller supporting >10W output with thermal management via MSOP package and external MOSFET. Use Value: INTVCC LDO stability and GATE drive strength ensure consistent PWM timing under load transients, minimizing display flicker. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3757EMS#TRPBF | Higher 100V input rating, integrated high-side gate driver, no internal LDO; requires external bias supply. | Better suited for 48V+ industrial or PoE applications; lacks no-RSENSE feature and Burst Mode optimization. | Select when input exceeds 36V or synchronous rectification is required; not drop-in due to different pinout and bias architecture. |
| TPS40210DRCT | Fixed 1.25V reference, no internal LDO, no Burst Mode, lower max duty cycle (85%), wider temp range (–40°C to +150°C). | Designed for cost-sensitive industrial SMPS where ultra-low IQ is not critical and higher ambient temps occur. | Choose for high-temp environments where 125°C I-grade is insufficient; requires external 5V bias and separate current sense resistor. |
Compared with LT3757EMS#TRPBF and TPS40210DRCT, the LTC1871IMS#TRPBF uniquely combines no-RSENSE sensing, programmable Burst Mode, and integrated 5.2V LDO in a compact MSOP-making it optimal for space-constrained, battery-sensitive boost/SEPIC designs below 36V input.
Availability
LTC1871IMS#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, portable electronic equipment, industrial sensor nodes, and automotive infotainment displays requiring stable component supply across extended temperature ranges.
Supply support for LTC1871IMS#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 and maintains its precision analog and power management portfolio with rigorous qualification standards.
The LTC1871IMS#TRPBF belongs to Linear's legacy high-efficiency DC/DC controller family, designed specifically for low-to-medium power non-isolated and isolated converters where efficiency, small footprint, and battery longevity are critical.
FAQ
What is the minimum input voltage required for LTC1871IMS#TRPBF to start switching?
The LTC1871IMS#TRPBF has a guaranteed minimum input voltage of 2.5V for normal operation. Its RUN pin falling threshold is 1.248V with 100mV hysteresis, so startup occurs when the divided input reaches ~1.35V. Below 2.5V, the internal circuits may not bias correctly, and gate drive strength degrades significantly. The datasheet confirms stable operation begins at 2.5V across the full –40°C to +125°C range for the I-grade LTC1871IMS#TRPBF.
Can LTC1871IMS#TRPBF operate without an external current sense resistor?
Yes, the LTC1871IMS#TRPBF supports true no-RSENSE operation by sensing the voltage drop across the power MOSFET's RDS(ON) via the SENSE pin connected to the drain. This eliminates power loss and PCB area associated with a discrete shunt. For outputs exceeding 36V, connect SENSE to a source resistor instead-this is explicitly supported and documented in the LTC1871IMS#TRPBF datasheet Figure 2b and Applications Information section.
How does the MODE/SYNC pin affect LTC1871IMS#TRPBF efficiency and noise performance?
When MODE/SYNC is grounded, LTC1871IMS#TRPBF enters Burst Mode, reducing light-load IQ to 250μA and improving battery runtime-but increasing output ripple and audible noise. When tied to INTVCC, it enables pulse-skip mode with lower ripple and deterministic frequency edges. When driven by an external clock, LTC1871IMS#TRPBF synchronizes to that source, enabling EMI filtering and predictable spectral content at the expense of ~5–10% efficiency penalty at light loads.
What is the purpose of the INTVCC pin on LTC1871IMS#TRPBF, and how should it be decoupled?
The INTVCC pin on LTC1871IMS#TRPBF is the output of an internal 5.2V low-dropout regulator that powers the gate driver and internal logic. It must be decoupled with ≥4.7μF low-ESR ceramic or tantalum capacitor placed directly between INTVCC and GND, adjacent to the IC pins. Failure to do so causes gate drive instability, especially during high-current MOSFET switching. The datasheet specifies this value and placement to handle transient currents up to 50mA.
Does LTC1871IMS#TRPBF provide overvoltage protection, and how is it implemented?
Yes, LTC1871IMS#TRPBF includes dedicated overvoltage protection. An internal comparator monitors the FB pin and triggers shutdown if the feedback voltage exceeds the 1.230V reference by 6.5% (i.e., ~1.31V). This generates a reset pulse to the main PWM latch, holding GATE low until FB returns to safe levels. The protection is active in all operating modes and does not require external components-confirmed in the Block Diagram (page 8) and Electrical Characteristics table (ΔVFB(OV) parameter).
LTC1871IMS#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC1871IMS#TRPBF FAQ
1.How can I place an order for LTC1871IMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1871IMS#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 LTC1871IMS#TRPBF reliable?
The price and inventory of LTC1871IMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1871IMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1871IMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1871IMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1871IMS#TRPBF?
LTC1871IMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1871IMS#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 LTC1871IMS#TRPBF?
For technical support, including LTC1871IMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1871IMS#TRPBF requirements.
6.How does Aetrix verify that LTC1871IMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1871IMS#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 LTC1871IMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1871IMS#TRPBF?
All LTC1871IMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1871IMS#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 LTC1871IMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC1871IMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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