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Analog Devices Inc. LTC1871IMS-1#TRPBF
- Part No.:
- LTC1871IMS-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1871IMS-1#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,366
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Product details
Overview
LTC1871IMS-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 discrete sense resistor. It operates from 2.5V to 36V input, delivers ±1% feedback reference accuracy, supports 50kHz–1MHz programmable switching frequency, and features 92% typical max duty cycle-enabling high-efficiency telecom power supplies and portable equipment.
For engineers reviewing the LTC1871IMS-1#TRPBF datasheet, LTC1871IMS-1#TRPBF pinout, LTC1871IMS-1#TRPBF application, or LTC1871IMS-1#TRPBF equivalent, key selection criteria include its ultra-low pulse-skip threshold for stable light-load operation, integrated 5.2V LDO regulator, no-RSENSE™ sensing architecture, and MODE/SYNC pin support for external clock synchronization up to 1.3× fOSC.
Technical Context
The LTC1871IMS-1#TRPBF implements constant-frequency current-mode control with leading-edge blanking and slope compensation, using the power MOSFET's RDS(ON) for current sensing to eliminate sense-resistor losses. Its error amplifier (650 μmho transconductance) drives the ITH pin to modulate peak inductor current, while internal 1.230V reference and ±1% FB voltage tolerance ensure precise output regulation.
It integrates a P-channel LDO delivering 5.2V at up to 50mA for gate driver and logic supply, with 280mV dropout at 20mA load. The RUN pin provides micropower enable/disable with 1.248V falling threshold and 100mV hysteresis, reducing shutdown current to 10μA. Pulse-skip mode is user-selectable via MODE/SYNC pin, and oscillator synchronization supports noise-sensitive systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 36V - supports wide-range industrial and automotive inputs without pre-regulation |
| Feedback Reference Voltage | 1.230V ±1% - enables accurate output voltage programming with minimal divider error |
| Switching Frequency Range | 50kHz to 1MHz - set by single RT resistor; balances efficiency vs. size in compact designs |
| Max Duty Cycle | 92% typical - allows high step-up ratios in boost and flyback configurations |
| Shutdown Quiescent Current | 10μA - minimizes battery drain in always-on portable systems |
| INTVCC Regulator Output | 5.2V ±0.2V - powers gate driver and internal logic; eliminates need for external bias supply |
| RUN Pin Threshold Hysteresis | 100mV - prevents chatter during input voltage ramp-up/down transitions |
Pinout & Package
Package: 10-lead MSOP (3mm × 3mm), rated for –40°C to +125°C junction temperature (I-grade), θJA = 120°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 1) | Enable/UVLO Input | Accurate 1.248V falling threshold with 100mV hysteresis; enables micropower shutdown control |
| ITH (Pin 2) | Error Amplifier Output | Drives current comparator threshold; 0.3V–1.4V range sets peak inductor current |
| FB (Pin 3) | Feedback Input | Compares output divider voltage to 1.230V reference; determines regulation setpoint |
| FREQ (Pin 4) | Oscillator Programming | 0.62V nominal; RT-to-ground sets frequency from 50kHz–1MHz |
| MODE/SYNC (Pin 5) | Mode Control / Clock Input | Selects Burst Mode (grounded) or continuous/pulse-skip (≥2V); accepts sync clock up to 1.3× fOSC |
| GND (Pin 6) | Power & Signal Ground | Common return for INTVCC, GATE, SENSE, and control circuitry |
| GATE (Pin 7) | MOSFET Gate Driver Output | High-current push-pull driver; rise/fall times <100ns into 3300pF |
| INTVCC (Pin 8) | LDO Output | 5.2V regulated supply for internal logic and gate driver; bypass with ≥4.7μF capacitor |
| VIN (Pin 9) | Main Power Input | Supplies bias for startup and LDO; decoupled locally to GND |
| SENSE (Pin 10) | Current Sense Input | Accepts VDS of MOSFET (no-RSENSE™) or source-shunt voltage; max 150mV threshold |
Key Features
| Feature | Design Value |
|---|---|
| No-RSENSE™ current sensing | Eliminates sense resistor losses and PCB area; improves efficiency by >2% in 5A boost converters |
| Ultra-low pulse-skip threshold | Enables stable constant-frequency operation across wide input ranges (e.g., 5V–24V) and light loads |
| Integrated 5.2V LDO regulator | Supplies gate driver and logic independently; reduces BOM count and simplifies bias design |
| Output overvoltage protection | FB pin OV lockout triggers RS latch reset at +6.5% over nominal, holding GATE off during fault |
| Programmable burst/pulse-skip modes | MODE/SYNC pin selects low-IQ Burst Mode (250μA) or fixed-frequency pulse-skip for ripple-sensitive apps |
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 topology, regulating output under dynamic load steps. Use Value: No-RSENSE™ sensing preserves >94% efficiency at full load; 125°C-rated package ensures reliability in sealed enclosures. |
Use Scenario: Single-cell Li-ion (2.7V–4.2V) to 5V USB power delivery in handheld test instruments. IC Role / Device Role / Timing Role: Boost controller enabling >90% efficiency across battery discharge curve without external sense resistor. Use Value: Micropower shutdown (10μA) extends shelf life; 92% max duty cycle sustains regulation down to 2.5V input. |
| Industrial Sensors & IoT Nodes | Automotive Infotainment Displays |
Use Scenario: 12V vehicle battery to 3.3V/1.8V rails for low-power sensor fusion modules in harsh environments. IC Role / Device Role / Timing Role: SEPIC controller providing non-inverting buck-boost regulation with input transients up to 36V. Use Value: –40°C to +125°C rating meets AEC-Q200 stress requirements; pulse-skip mode maintains low ripple at standby currents <100μA. |
Use Scenario: 5V–16V automotive supply to 12V backlight driver for TFT LCD panels. IC Role / Device Role / Timing Role: High-duty-cycle boost controller supporting 12V output with fast transient response to display brightness changes. Use Value: 50kHz–1MHz frequency programming avoids AM radio band interference; synchronized mode enables EMI-controlled timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780EFE#PBF | Wide-input synchronous boost controller with integrated gate drivers; requires external sense resistors; no no-RSENSE™ capability | Higher integration but lower efficiency in high-current boost due to sense resistor losses | Choose when synchronous rectification and higher peak current (>10A) are required |
| LM5122MMX/NOPB | Current-mode boost/flyback controller with 3.5V–65V input; uses external sense resistor; 100% duty cycle capable; no integrated LDO | Wider VIN range but needs external 5V bias rail; less suitable for space-constrained portable designs | Choose for ultra-high input voltage applications (>36V) where external bias is acceptable |
Compared with LTC3780EFE#PBF and LM5122MMX/NOPB, the LTC1871IMS-1#TRPBF uniquely combines no-RSENSE™ sensing, integrated 5.2V LDO, and ultra-low pulse-skip threshold-making it optimal for efficiency-critical, thermally constrained, and compact boost/SEPIC designs operating below 36V input.
Availability
LTC1871IMS-1#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, portable electronic equipment, industrial sensors, automotive infotainment displays, and IoT node power management requiring stable component supply across extended temperature ranges.
Supply support for LTC1871IMS-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 acquired Linear Technology in 2017 and maintains its precision analog and power management product lines with full technical documentation and long-term support.
The LTC1871IMS-1#TRPBF belongs to Linear's high-efficiency DC/DC controller family, designed specifically for no-RSENSE™ boost, flyback, and SEPIC converters targeting space- and thermal-constrained applications in industrial, telecom, and portable markets.
FAQ
What is the maximum input voltage supported by the LTC1871IMS-1#TRPBF?
The LTC1871IMS-1#TRPBF supports an absolute maximum input voltage of 36V on the VIN pin and 36V on the SENSE pin. Its operational input range is specified from 2.5V to 36V, making it suitable for 24V industrial systems and automotive cold-crank scenarios. Exceeding 36V risks permanent damage per Absolute Maximum Ratings.
How does the no-RSENSE™ feature work in the LTC1871IMS-1#TRPBF?
The LTC1871IMS-1#TRPBF senses current by measuring the voltage drop across the RDS(ON) of the external N-channel MOSFET via the SENSE pin-eliminating the power loss and board area of a discrete sense resistor. This method is valid only when VSW < 36V; for higher output voltages, a shunt resistor in the MOSFET source is required.
Can the LTC1871IMS-1#TRPBF be synchronized to an external clock?
Yes, the LTC1871IMS-1#TRPBF can be synchronized to an external clock applied to the MODE/SYNC pin. It locks to frequencies between 100% and 130% of its nominal oscillator frequency (fOSC). The external signal must exceed 2V for ≥25ns with ≤80% duty cycle, and synchronization increases internal slope compensation by ~30% to maintain stability.
What is the purpose of the RUN pin on the LTC1871IMS-1#TRPBF?
The RUN pin on the LTC1871IMS-1#TRPBF provides precise micropower enable/disable control with a 1.248V falling threshold and 100mV hysteresis. When pulled below threshold, the IC enters shutdown mode drawing only 10μA. It remains active during shutdown, allowing accurate input UVLO programming using an external resistor divider.
Does the LTC1871IMS-1#TRPBF include overvoltage protection?
Yes, the LTC1871IMS-1#TRPBF includes output overvoltage protection via an internal comparator monitoring the FB pin. If FB exceeds the 1.230V reference by 6.5% (i.e., 2.5V for a 5V output), the comparator resets the main PWM latch, forcing GATE low and holding the MOSFET off until the fault clears-preventing downstream component damage.
LTC1871IMS-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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC1871IMS-1#TRPBF FAQ
1.How can I place an order for LTC1871IMS-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1871IMS-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 LTC1871IMS-1#TRPBF reliable?
The price and inventory of LTC1871IMS-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 LTC1871IMS-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1871IMS-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1871IMS-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1871IMS-1#TRPBF?
LTC1871IMS-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1871IMS-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 LTC1871IMS-1#TRPBF?
For technical support, including LTC1871IMS-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1871IMS-1#TRPBF requirements.
6.How does Aetrix verify that LTC1871IMS-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1871IMS-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 LTC1871IMS-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1871IMS-1#TRPBF?
All LTC1871IMS-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1871IMS-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 LTC1871IMS-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC1871IMS-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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