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Analog Devices Inc. LTC1871IMS-7#TRPBF
- Part No.:
- LTC1871IMS-7#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1871IMS-7#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,613
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Product details
Overview
LTC1871IMS-7#TRPBF from Analog Devices (formerly Linear Technology) is a current-mode DC/DC controller IC optimized for high-input-voltage boost, flyback, and SEPIC topologies, driving 6V-rated MOSFETs in telecom and industrial power supplies. It features a programmable 50kHz–1MHz switching frequency, 92% typical maximum duty cycle, ±1% internal 1.230V reference, and integrated 7V LDO regulator with 5.6V/4.6V UVLO thresholds - enabling stable 12V flyback housekeeping supplies from 36V–72V input rails.
For engineers reviewing the LTC1871IMS-7#TRPBF datasheet, LTC1871IMS-7#TRPBF pinout, LTC1871IMS-7#TRPBF application, or LTC1871IMS-7#TRPBF equivalent, key selection criteria include its burst-mode efficiency at light loads (250µA sleep current), MODE/SYNC-synchronized operation up to 1.3× fOSC, INTVCC-regulated gate drive capability, and validated use in 42V automotive systems and IP phone power supplies.
Technical Context
The LTC1871IMS-7#TRPBF implements a constant-frequency, current-mode control architecture with slope compensation, where the ITH pin voltage (0.3V–1.23V range) directly sets the peak current comparator threshold. Its internal 7V LDO powers both gate driver and logic circuits, with undervoltage lockout tied to INTVCC (5.6V rise / 4.6V fall), not VIN.
Operating mode is selected via MODE/SYNC: grounded for Burst Mode (micropower sleep at <100µA load), pulled to INTVCC for pulse-skip DCM, or driven by external clock for synchronized fixed-frequency operation. The RUN pin provides accurate, hysteresis-equipped (100mV) enable/disable control with 1.248V falling threshold - independent of main supply regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | Programmable 50kHz–1MHz via single RT resistor; enables tradeoff between MOSFET/diode switching loss and inductor size. |
| Max Duty Cycle | 92% typical (87–98.5% over temp); supports high step-up ratios in boost/flyback, e.g., 12V out from 36V min input. |
| INTVCC Regulator | 7.0V ±0.5V output; powers gate driver and internal logic; includes 5.6V/4.6V UVLO with 1.0V hysteresis for MOSFET gate integrity. |
| Feedback Reference | 1.230V ±0.012V (±1%); used with external resistor divider to set precise output voltage (e.g., VO = 1.23 × (1 + R2/R1)). |
| Burst Mode IQ | 280–500µA (typ) at no load; drops to 12–25µA in shutdown; enables battery-backed telecom systems with multi-day standby. |
| RUN Pin Threshold | Falling threshold = 1.248V ±25mV with 100mV hysteresis; allows accurate, noise-immune input-voltage turn-on/off programming. |
| SENSE Threshold | 150mV typical max (100–200mV over temp); sets current limit when sensing across MOSFET RDS(ON) or shunt resistor. |
Pinout & Package
Package: 10-lead plastic MSOP (10-Lead Plastic MSOP), 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/disable control input | Micro-power comparator input with 1.248V falling threshold and 100mV hysteresis; remains active in shutdown. |
| ITH (Pin 2) | Error amplifier output / current threshold control | Voltage (0.3V–1.23V) sets peak switch current; clamped at 0.525V in Burst Mode to limit light-load current. |
| FB (Pin 3) | Feedback input | Compares divided output voltage to 1.230V reference; 18–60nA input bias enables high-resistor-divider designs. |
| FREQ (Pin 4) | Oscillator programming node | 0.62V nominal voltage; RT-to-ground sets fOSC (50kHz–1MHz); current charges internal timing capacitor. |
| MODE/SYNC (Pin 5) | Mode selection & synchronization input | Ground = Burst Mode; INTVCC = pulse-skip DCM; external clock = synchronized operation (up to 1.3× fOSC). |
| GND (Pin 6) | Analog/digital ground reference | Common return for control circuitry, error amplifier, and current sense; must be low-impedance connection. |
| GATE (Pin 7) | High-side N-channel MOSFET driver output | Capable of driving >1nF load; 17ns rise / 8ns fall time (CL = 3300pF); powered by INTVCC rail. |
| INTVCC (Pin 8) | Internal 7V LDO output | Powers gate driver and internal logic; requires ≥4.7µF local ceramic bypass; UVLO protects MOSFET gate drive. |
| VIN (Pin 9) | Main power input | 6V–36V operating range; supplies bias current and charges INTVCC LDO; must be closely decoupled to GND. |
| SENSE (Pin 10) | Current sense input | Accepts voltage drop across MOSFET (VDS < 36V) or source shunt; includes leading-edge blanking for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE™ operation | SENSE pin connects directly to MOSFET drain for VDS < 36V, eliminating sense resistor losses and improving efficiency. |
| Wide input voltage range | 6V–36V VIN operation enables direct use in 24V industrial controls and 42V automotive systems without pre-regulation. |
| Low-quiescent-current Burst Mode | 250µA sleep current at ultra-light loads extends battery life in telecom housekeeping supplies and IP phones. |
| Output overvoltage protection | FB pin OV comparator triggers RS latch reset if VFB exceeds reference by 6.5%, holding GATE off during fault. |
| Programmable frequency & sync | Single RT resistor sets fOSC; MODE/SYNC accepts external clock up to 1.3× nominal frequency for EMI control. |
Applications
| Telecom Housekeeping Supply | 42V Automotive Power Module |
|---|---|
|
Use Scenario: Generating isolated 12V/0.4A auxiliary rail from 36V–72V telecom rectified input for system management ICs. IC Role / Device Role / Timing Role: Current-mode flyback controller managing primary-side regulation, MOSFET gate drive, and burst-mode sleep sequencing. Use Value: Eliminates need for external LDO or pre-regulator; 92% duty cycle supports wide input range; 10µA shutdown IQ preserves backup battery. |
Use Scenario: Providing regulated 5V/3A power for infotainment ECUs in 42V stop-start vehicle architectures. IC Role / Device Role / Timing Role: Boost controller driving external 6V-rated MOSFET to step up 12V–42V battery input to stable intermediate bus. Use Value: 6V MOSFET optimization reduces conduction loss; INTVCC UVLO prevents weak gate drive during cranking; -40°C to +125°C rating ensures under-hood reliability. |
| IP Phone Power Adapter | 24V Industrial Control Rail |
|
Use Scenario: Compact, low-noise 5V/1A power supply for VoIP phones drawing PoE+ (IEEE 802.3at) or local AC adapter input. IC Role / Device Role / Timing Role: SEPIC controller delivering non-inverting, input-rail-independent output with inherent short-circuit robustness. Use Value: Burst Mode maintains >85% efficiency at 10mA load; MODE/SYNC synchronization enables EMI filtering compliance; small MSOP footprint saves PCB area. |
Use Scenario: Generating 15V/2A auxiliary supply from 24V factory automation bus for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: High-efficiency boost controller with programmable fOSC (300kHz) to balance switching loss vs. inductor size in space-constrained enclosures. Use Value: ±1% FB reference ensures tight output tolerance across temperature; 100mV RUN hysteresis rejects line noise in electrically noisy plant environments. |
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 VIN max (100V), no integrated INTVCC LDO, requires external bias supply; 1.25V FB reference. | Better suited for >72V inputs (e.g., industrial HVDC); lacks built-in 7V regulator for gate drive - adds BOM complexity. | Select LT3757EMS#TRPBF only when input exceeds 36V or higher UVLO margin is required; LTC1871IMS-7#TRPBF preferred for ≤36V with simplified biasing. |
| UCC28C43DR | Fixed 1MHz frequency, no Burst Mode, 2.5V start-up, no integrated LDO; lower cost but higher light-load IQ (~1mA). | Targeted at cost-sensitive, fixed-frequency industrial converters where micropower operation is not critical. | Choose UCC28C43DR for high-volume, non-battery applications needing minimal external components; LTC1871IMS-7#TRPBF delivers superior light-load efficiency and design flexibility. |
Compared with LT3757EMS#TRPBF and UCC28C43DR, the LTC1871IMS-7#TRPBF uniquely combines integrated 7V LDO gate drive, programmable frequency, Burst Mode, and 6V-MOSFET optimization - making it optimal for compact, efficient, medium-input-voltage flyback/boost supplies where board space and standby power are constrained.
Availability
LTC1871IMS-7#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, 42V automotive systems, and 24V industrial controls requiring stable component supply, extended temperature support (–40°C to +125°C), and long-term production continuity.
Supply support for LTC1871IMS-7#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, industrial, automotive, and communications markets.
The LTC1871IMS-7#TRPBF belongs to Linear's legacy high-voltage DC/DC controller product line, designed specifically for efficient, compact, and reliable non-isolated and isolated power conversion in demanding telecom, automotive, and industrial environments.
FAQ
What is the maximum input voltage supported by the LTC1871IMS-7#TRPBF?
The LTC1871IMS-7#TRPBF supports a maximum VIN of 36V, as specified in its Absolute Maximum Ratings. Exceeding this voltage risks permanent damage. Its internal INTVCC regulator has a separate 9V absolute maximum rating, and the SENSE pin tolerates up to 36V when used in No RSENSE™ mode. For inputs above 36V, consider alternatives like the LT3757.
How does the MODE/SYNC pin affect operation of the LTC1871IMS-7#TRPBF?
The MODE/SYNC pin on the LTC1871IMS-7#TRPBF selects operating mode: grounded enables Burst Mode for micropower light-load operation; tied to INTVCC disables Burst Mode for pulse-skip DCM; driven by an external clock synchronizes the oscillator (up to 1.3× fOSC). An internal 50kΩ pull-down ensures default Burst Mode when left open.
Can the LTC1871IMS-7#TRPBF drive a MOSFET without an external sense resistor?
Yes - the LTC1871IMS-7#TRPBF supports No RSENSE™ operation. When the SENSE pin is connected to the MOSFET drain (not source), it senses VDS directly, provided VDS remains below 36V. This eliminates sense resistor losses and improves efficiency, especially in high-current boost/flyback designs.
What is the purpose of the RUN pin on the LTC1871IMS-7#TRPBF?
The RUN pin on the LTC1871IMS-7#TRPBF provides accurate, micropower input-voltage enable/disable control. With a 1.248V falling threshold and 100mV hysteresis, it allows precise programming of turn-on/turn-off voltages using an external resistor divider - critical for brown-out protection and battery cutoff in telecom and automotive systems.
Does the LTC1871IMS-7#TRPBF include overvoltage protection?
Yes - the LTC1871IMS-7#TRPBF includes dedicated output overvoltage protection. An internal comparator monitors the FB pin and triggers a reset pulse to the main PWM latch if VFB exceeds the 1.230V reference by more than 6.5% (i.e., ~2.5–10% overvoltage). This forces the GATE output low and holds the MOSFET off until the fault clears.
LTC1871IMS-7#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):
- 6V ~ 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-7#TRPBF FAQ
1.How can I place an order for LTC1871IMS-7#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1871IMS-7#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-7#TRPBF reliable?
The price and inventory of LTC1871IMS-7#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-7#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1871IMS-7#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1871IMS-7#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1871IMS-7#TRPBF?
LTC1871IMS-7#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1871IMS-7#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-7#TRPBF?
For technical support, including LTC1871IMS-7#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1871IMS-7#TRPBF requirements.
6.How does Aetrix verify that LTC1871IMS-7#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1871IMS-7#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-7#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1871IMS-7#TRPBF?
All LTC1871IMS-7#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1871IMS-7#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-7#TRPBF part is unused and in its original packaging.
Return procedure for LTC1871IMS-7#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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