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Analog Devices Inc. LTC1871EMS-1#TRPBF
- Part No.:
- LTC1871EMS-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1871EMS-1#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,978
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Product details
Overview
LTC1871EMS-1#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, features ±1% internal reference, 100mV RUN pin hysteresis, and supports programmable 50kHz–1MHz switching with external resistor or synchronization via MODE/SYNC pin. It enables high-efficiency telecom and portable power supplies.
For engineers reviewing the LTC1871EMS-1#TRPBF datasheet, LTC1871EMS-1#TRPBF pinout, LTC1871EMS-1#TRPBF application, or LTC1871EMS-1#TRPBF equivalent, key selection criteria include no-RSENSE operation using MOSFET RDS(ON), ultra-low pulse-skip threshold for stable light-load frequency, 10-lead MSOP package thermal performance (θJA = 120°C/W), INTVCC LDO regulation at 5.2V, and output overvoltage protection.
Technical Context
The LTC1871EMS-1#TRPBF implements constant-frequency current-mode control with leading-edge blanking, slope compensation, and a micropower RUN comparator with 1.248V falling threshold and 100mV hysteresis. Its error amplifier (gm = 650 μmho) drives the ITH pin to modulate peak current sensing threshold (120–180 mV typical), enabling precise load regulation across input and temperature variations.
It integrates a 5.2V low-dropout regulator (280mV dropout at 20mA) powering gate driver and logic, supports Burst Mode® (250μA IQ) and pulse-skip operation, and allows external synchronization up to 1.3× fOSC. The SENSE pin accepts either VDS sensing (for ≤36V outputs) or source-resistor sensing (for higher outputs), with internal blanking for both configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 36V - supports wide-range industrial, automotive, and telecom inputs without pre-regulation. |
| Switching Frequency | 50kHz to 1MHz - set by single RT resistor; enables optimization of efficiency vs. size in boost/SEPIC/flyback designs. |
| Max Duty Cycle | 92% typical - allows high step-up ratios (e.g., 3.3V→12V) in continuous conduction mode. |
| Feedback Reference | 1.230V ±1% - high-accuracy reference enables tight output voltage regulation (±0.1% line/load regulation). |
| RUN Pin Threshold | 1.248V falling / 1.348V rising with 100mV hysteresis - provides noise-immune, accurate enable/disable control for battery-powered systems. |
| Shutdown IQ | 10μA typical - enables ultra-low-power standby in portable equipment and IoT edge nodes. |
| INTVCC Regulator | 5.2V ±0.2V, 50mA max - powers gate driver and internal circuitry; requires ≥4.7μF local bypass for transient response. |
Pinout & Package
Package: 10-lead plastic MSOP (3mm × 3mm, 0.5mm pitch), rated for –40°C to +85°C junction temperature (E-grade), θJA = 120°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (1) | Enable/UVLO input | Microamp-level comparator input with 1.248V falling threshold and 100mV hysteresis; controls full IC shutdown (IQ = 10μA). |
| ITH (2) | Error amplifier output | Controls current comparator threshold (0.3V–1.2V range); sets peak inductor current; used for loop compensation. |
| FB (3) | Feedback input | Compares divided output voltage to 1.230V reference; determines regulation accuracy and stability margin. |
| FREQ (4) | Oscillator programming | Accepts RT-to-ground resistor; sets nominal fOSC (50kHz–1MHz); nominal pin voltage = 0.62V. |
| MODE/SYNC (5) | Mode control / sync input | Ground = Burst Mode®; >2V = pulse-skip mode; external clock = synchronization (up to 1.3× fOSC). |
| GND (6) | Power and signal ground | Common return for VIN, INTVCC, SENSE, and gate driver; must be low-impedance for noise immunity. |
| GATE (7) | MOSFET gate driver output | Capable of driving N-channel MOSFET gates; rise/fall times <100ns with 3.3nF load; supports bootstrap operation. |
| INTVCC (8) | Internal LDO output | 5.2V regulated supply for gate driver and logic; requires ≥4.7μF local ceramic/tantalum bypass to GND. |
| VIN (9) | Main input supply | Primary power input (2.5V–36V); powers internal bias circuits and charges INTVCC LDO when VIN > 7.5V. |
| SENSE (10) | Current sense input | Accepts VDS (MOSFET drain) or source-resistor voltage; internal blanking prevents false triggering during switching transitions. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE™ operation | Uses MOSFET RDS(ON) for current sensing - eliminates power loss and board space of discrete shunt, improving efficiency by up to 3% in 5V→12V boost. |
| Ultra-low pulse-skip threshold | 195mV typical ITH burst threshold - maintains constant-frequency operation down to <1% load, critical for wide-input telecom supplies. |
| Programmable frequency with one resistor | RT resistor sets fOSC from 50kHz to 1MHz - simplifies EMI filtering design and enables trade-off between inductor size and switching loss. |
| Output overvoltage protection | FB overvoltage lockout at +6.5% of 1.230V - asserts reset pulse to PWM latch, holding GATE low during fault to protect downstream loads. |
| Internal 5.2V LDO with 280mV dropout | Supplies gate driver and logic up to 50mA - eliminates need for external bias rail; stable under 20mA load with <0.2% load regulation. |
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-side current-mode controller in isolated flyback configuration, regulating secondary output via optocoupler feedback. Use Value: No-RSENSE operation reduces heat generation in compact enclosures; 92% max duty cycle supports high step-down ratios with minimal transformer turns ratio. |
Use Scenario: Single-cell Li-ion (3.0–4.2V) to 5V USB power bank output with high efficiency across full battery discharge curve. IC Role / Device Role / Timing Role: Boost controller with integrated LDO powering its own gate driver and external logic; RUN pin enables battery undervoltage cutoff. Use Value: 10μA shutdown IQ extends shelf life; Burst Mode® maintains >85% efficiency at 1mA load; 10-lead MSOP fits space-constrained PCB layouts. |
| Industrial Sensors & IoT Nodes | Automotive Infotainment Displays |
|
Use Scenario: 12V vehicle battery or 24V rail powering 3.3V microcontroller and 5V sensor interface in remote monitoring units. IC Role / Device Role / Timing Role: SEPIC controller providing non-inverting buck-boost regulation with input transients up to 36V (load dump). Use Value: Wide 2.5V–36V input range tolerates cold-crank (6V) and load-dump (36V); pulse-skip mode ensures fixed-frequency EMI profile during EMC testing. |
Use Scenario: 5V system rail generation from 12V automotive battery for LCD backlight drivers and touch controllers. IC Role / Device Role / Timing Role: High-duty-cycle boost controller driving external MOSFET; SENSE pin connected to source resistor for precise current limiting above 36V. Use Value: Output overvoltage protection safeguards sensitive display ICs; 1.248V RUN threshold enables clean startup after ignition sequence; MSOP package meets AEC-Q200 board-level reliability requirements. |
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 VIN max, integrated VGS clamp, but no Burst Mode®; requires external sense resistor. | Better suited for 48V+ industrial flyback; lacks ultra-low-light-load frequency stability of LTC1871EMS-1#TRPBF. | Select LT3757EMS#TRPBF only when input exceeds 36V or primary-side sensing with clamping is required. |
| TPS40210DRCT | Fixed 1.25V FB reference, no internal LDO, requires external 5V bias; lower max duty cycle (85%). | Lower BOM cost for simple boost; unsuitable for standalone operation from wide input without auxiliary supply. | Choose TPS40210DRCT only if external 5V rail exists and efficiency at light load is not critical. |
Compared with LT3757EMS#TRPBF and TPS40210DRCT, the LTC1871EMS-1#TRPBF uniquely combines no-RSENSE operation, ultra-low pulse-skip threshold for constant-frequency light-load behavior, and self-contained 5.2V LDO - making it optimal for space- and efficiency-constrained 2.5V–36V boost/SEPIC/flyback designs where component count and thermal management are critical.
Availability
LTC1871EMS-1#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, portable electronic equipment, industrial sensors, and automotive infotainment displays requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1871EMS-1#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, serving precision instrumentation, communications, and industrial markets.
The LTC1871EMS-1#TRPBF belongs to Linear's legacy high-efficiency DC/DC controller product line, designed specifically for wide-input, no-RSENSE boost, flyback, and SEPIC converters targeting telecom infrastructure, portable power, and rugged industrial applications.
FAQ
What is the maximum input voltage rating for the LTC1871EMS-1#TRPBF?
The LTC1871EMS-1#TRPBF has an absolute maximum VIN rating of 36V, with guaranteed operation from 2.5V to 36V. Exceeding 36V on VIN risks permanent damage. For applications requiring >36V input, consider the LT3757EMS#TRPBF, which supports up to 100V VIN and includes integrated VGS clamping.
How does the LTC1871EMS-1#TRPBF achieve no-RSENSE operation?
The LTC1871EMS-1#TRPBF senses current by measuring the voltage drop across the power MOSFET's RDS(ON) via the SENSE pin connected to the MOSFET drain. This eliminates the power loss and board area of a discrete sense resistor. For higher output voltages (>36V), the SENSE pin can instead connect to a source-resistor for precise current control.
What is the purpose of the MODE/SYNC pin on the LTC1871EMS-1#TRPBF?
The MODE/SYNC pin on the LTC1871EMS-1#TRPBF selects operating mode: grounded → Burst Mode® (low IQ at light load); tied to INTVCC → pulse-skip mode (fixed-frequency discontinuous conduction); driven by external clock → synchronization (fSYNC up to 1.3× fOSC). It also provides internal 50kΩ pull-down when open.
Can the LTC1871EMS-1#TRPBF be used in flyback topology with primary-side regulation?
Yes - the LTC1871EMS-1#TRPBF supports flyback operation with primary-side regulation using the SENSE pin to monitor reflected output voltage via an auxiliary winding. Its current-mode architecture and slope compensation ensure stability across variable duty cycles, and the 92% max duty cycle accommodates wide input/output ratios common in isolated designs.
What thermal considerations apply to the LTC1871EMS-1#TRPBF in high-frequency, high-current applications?
The LTC1871EMS-1#TRPBF in 10-lead MSOP has θJA = 120°C/W. Gate charge current (QG × fOSC) dominates total supply current at high frequencies. For example, at 500kHz with QG = 37nC, IQ(TOT) ≈ 19.1mA - requiring careful PCB layout, copper pour, and ambient derating to keep TJ < 125°C.
LTC1871EMS-1#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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC1871EMS-1#TRPBF FAQ
1.How can I place an order for LTC1871EMS-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1871EMS-1#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 LTC1871EMS-1#TRPBF reliable?
The price and inventory of LTC1871EMS-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1871EMS-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1871EMS-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1871EMS-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1871EMS-1#TRPBF?
LTC1871EMS-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1871EMS-1#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 LTC1871EMS-1#TRPBF?
For technical support, including LTC1871EMS-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1871EMS-1#TRPBF requirements.
6.How does Aetrix verify that LTC1871EMS-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1871EMS-1#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 LTC1871EMS-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1871EMS-1#TRPBF?
All LTC1871EMS-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1871EMS-1#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 LTC1871EMS-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC1871EMS-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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