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Analog Devices Inc. LTC1871EMS-7#TRPBF
- Part No.:
- LTC1871EMS-7#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1871EMS-7#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,228
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Product details
Overview
LTC1871EMS-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 housekeeping supplies, 42V automotive systems, and 24V industrial controls. 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.
For engineers reviewing the LTC1871EMS-7#TRPBF datasheet, LTC1871EMS-7#TRPBF pinout, LTC1871EMS-7#TRPBF application, or LTC1871EMS-7#TRPBF equivalent, key selection considerations include its burst mode operation at light loads (IQ = 280µA), RUN pin threshold hysteresis (100mV), INTVCC-regulated gate drive capability, and compatibility with no-RSENSE sensing for VDS < 36V.
Technical Context
The LTC1871EMS-7#TRPBF implements a constant-frequency, current-mode control architecture with slope compensation, supporting CCM and DCM operation. Its error amplifier (gm = 600 µmho) drives the ITH pin to modulate peak current comparator threshold, enabling fast transient response and stable loop behavior across wide input (6V–36V) and output voltage ranges.
Internal circuitry includes a 7V LDO (INTVCC) powering gate driver and logic, a micropower RUN pin comparator (1.248V falling threshold, 100mV hysteresis), and MODE/SYNC pin logic that selects between Burst Mode (pin grounded), pulse-skip mode (pin tied to INTVCC), or external clock synchronization (up to 1.3×fOSC).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency Range | 50kHz to 1MHz, set by single resistor on FREQ pin - enables tradeoff between efficiency (lower f) and size (higher f) |
| Max Duty Cycle | 92% typical - supports high step-up ratios in boost/flyback, e.g., 36V input to 12V output with margin |
| INTVCC Regulator | 7.0V ±0.5V output, 50mA max - powers gate driver and internal logic; UVLO at 5.6V rise / 4.6V fall prevents weak gate drive |
| Feedback Reference | 1.230V ±0.012V - sets output voltage accuracy; line/load regulation ≤0.02%/V and ≤0.1% ensures stable regulation across conditions |
| RUN Pin Threshold | 1.248V falling, 1.348V rising, 100mV hysteresis - enables precise, noise-immune input voltage enable/disable control |
| Shutdown Quiescent Current | 12µA typical - enables battery-backed or low-power standby operation without significant drain |
| SENSE Pin Threshold | 150mV typical - defines current limit point; supports both MOSFET RDS(ON) sensing (VDS < 36V) and external shunt sensing |
Pinout & Package
Package: 10-lead MSOP (3mm × 3mm), 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 | Microampere-biased comparator input; 1.248V falling threshold enables precise input voltage turn-on/off control with 100mV hysteresis |
| ITH (2) | Error amplifier output | Drives current comparator threshold; 0.3V–1.23V range corresponds to 0–100% load, enabling direct current-mode loop compensation |
| FB (3) | Feedback input | Compares output divider voltage to 1.230V reference; ±1% tolerance ensures accurate output voltage setting |
| FREQ (4) | Oscillator programming | Sinks constant current to ground via external resistor; 0.62V nominal voltage enables 50kHz–1MHz frequency selection |
| MODE/SYNC (5) | Mode control & sync input | Configures Burst Mode (ground), continuous/pulse-skip (INTVCC), or external clock sync (2V–7V pulses, min 25ns) |
| GND (6) | Power and signal ground | Common return for all analog and power circuits; requires low-inductance connection to minimize noise coupling |
| GATE (7) | MOSFET gate driver output | Capable of driving ≥3300pF load; 17ns rise / 8ns fall time supports fast-switching 6V-rated MOSFETs |
| INTVCC (8) | Internal LDO output | 7V regulated supply for gate driver and core logic; must be bypassed with ≥4.7µF ceramic capacitor adjacent to pin |
| VIN (9) | Main power input | Accepts 6V–36V input; powers INTVCC LDO and supplies bias current; requires local high-frequency decoupling |
| SENSE (10) | Current sense input | Accepts voltage from MOSFET source (shunt) or drain (no-RSENSE); 150mV threshold with leading-edge blanking rejects switching noise |
Key Features
| Feature | Design Value |
|---|---|
| No-RSENSE™ sensing | Enables direct SENSE pin connection to MOSFET drain for VDS < 36V - eliminates sense resistor, improves efficiency, reduces BOM count |
| Burst Mode® operation | Reduces light-load IQ to 280µA (typ) - extends battery life in standby telecom or IP phone applications |
| Programmable frequency with one resistor | Eliminates need for external oscillator components - simplifies design, improves layout robustness, enables EMI tuning |
| Output overvoltage protection | Resets PWM latch when FB exceeds 1.230V by 6.5% - prevents damage to downstream circuitry during feedback fault |
| High-duty-cycle capability | 92% typical max duty cycle - supports wide input ranges (e.g., 36V–72V telecom) with minimal external component stress |
| Wide VIN range (6V–36V) | Operates directly from 12V/24V/42V rails without pre-regulation - reduces system complexity in automotive and industrial power supplies |
Applications
| Telecom Housekeeping Supply | 42V Automotive System |
|---|---|
Use Scenario: Generating isolated 12V/0.4A auxiliary rail from 36V–72V telecom rectified input in central office equipment. IC Role / Device Role / Timing Role: Current-mode flyback controller managing primary-side regulation, MOSFET gate drive, and burst-mode light-load efficiency. Use Value: Enables compact, thermally efficient design using 6V-rated MOSFETs and no-RSENSE sensing - reduces bill-of-materials and PCB area vs. discrete solutions. |
Use Scenario: Powering infotainment ECUs from 42V mild-hybrid vehicle battery under cold-crank (6V min) and load-dump (36V max) conditions. IC Role / Device Role / Timing Role: Boost controller regulating 5V/3A output with precise RUN-pin enable/disable sequencing relative to battery voltage. Use Value: Wide 6V–36V input range and 1.248V RUN threshold with hysteresis ensure reliable start-up and shutdown across harsh automotive transients. |
| 24V Industrial Control | IP Phone Power Supply |
Use Scenario: Providing 12V/1A non-isolated SEPIC output from 24V factory floor supply subject to brownouts and surges. IC Role / Device Role / Timing Role: High-efficiency SEPIC controller with programmable 300kHz switching and synchronous mode support for EMI compliance. Use Value: 92% max duty cycle and ±1% reference maintain tight output regulation despite wide input variation - critical for PLC I/O modules. |
Use Scenario: Delivering 12V/0.3A PoE-powered IP phone supply with ultra-low standby consumption (<100µA system-level). IC Role / Device Role / Timing Role: Burst Mode-enabled boost controller minimizing quiescent draw while maintaining fast wake-up response. Use Value: 12µA shutdown IQ and 280µA burst-mode IQ enable multi-year battery backup and meet IEEE 802.3af/at low-power idle requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-mode boost/flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3757EMS-7#TRPBF | Higher 100V VIN rating; 1.25V FB reference; no built-in 7V LDO - requires external bias supply | Better suited for >60V industrial or AC/DC front-end applications; lacks integrated INTVCC for 6V-MOSFET optimization | Select LT3757EMS-7#TRPBF only if input exceeds 36V or higher FB accuracy (±0.5%) is required; not drop-in compatible due to different bias architecture. |
| UCC28C43DR | Fixed 275kHz frequency; 1.0V FB reference; no burst mode; 16V max VIN - requires external LDO for >16V inputs | Lower cost for fixed-frequency, non-battery applications; lacks light-load efficiency features and high-VIN capability | Choose UCC28C43DR for cost-sensitive, line-powered 24V systems where burst mode and wide VIN are unnecessary; requires redesign of bias and sensing networks. |
Compared with LT3757EMS-7#TRPBF and UCC28C43DR, the LTC1871EMS-7#TRPBF uniquely integrates a 7V LDO optimized for 6V MOSFETs, offers programmable frequency with one resistor, and delivers industry-leading burst-mode IQ (280µA) - making it optimal for space-constrained, battery-aware, high-input-voltage DC/DC designs.
Availability
LTC1871EMS-7#TRPBF is available at Aetrix Electronics and suitable for telecom housekeeping supplies, 42V automotive systems, and 24V industrial controls requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1871EMS-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 automation, communications, and automotive markets.
The LTC1871 product line was designed specifically for high-efficiency, high-input-voltage DC/DC conversion using cost-effective 6V-rated MOSFETs - targeting telecom, automotive, and industrial power supply applications where thermal performance and light-load efficiency are critical.
FAQ
What is the maximum input voltage supported by the LTC1871EMS-7#TRPBF?
The LTC1871EMS-7#TRPBF supports a maximum input voltage of 36V on the VIN pin, with absolute maximum rating of –0.3V to 36V. Exceeding this may cause permanent damage. The internal INTVCC LDO has a separate 9V absolute maximum rating, but its operating range is limited to 6V–36V input for proper regulation. For inputs above 36V, external pre-regulation is required before applying voltage to VIN.
How does the RUN pin function in the LTC1871EMS-7#TRPBF?
The RUN pin on the LTC1871EMS-7#TRPBF provides precise enable/disable control via an internal 1.248V reference comparator with 100mV hysteresis. When the RUN voltage falls below 1.248V, the IC enters shutdown mode with ~12µA quiescent current. Rising above 1.348V re-enables operation. This allows accurate input voltage threshold programming using an external resistor divider - essential for cold-crank detection in automotive systems.
Can the LTC1871EMS-7#TRPBF drive MOSFETs without an external current sense resistor?
Yes, the LTC1871EMS-7#TRPBF supports No-RSENSE™ operation by connecting the SENSE pin directly to the MOSFET drain, provided VDS remains below 36V. This uses the MOSFET's RDS(ON) as the current sense element, eliminating the shunt resistor and associated losses. For VDS > 36V or precise current limiting, connect SENSE to a source-side shunt resistor instead.
What is the purpose of the MODE/SYNC pin on the LTC1871EMS-7#TRPBF?
The MODE/SYNC pin on the LTC1871EMS-7#TRPBF configures operating mode and enables external clock synchronization. Grounding it enables Burst Mode for lowest light-load IQ. Tying it to INTVCC disables Burst Mode for pulse-skip operation. Applying a logic-level clock (≥2V, ≥25ns pulse width) synchronizes the internal oscillator up to 1.3× its nominal frequency - reducing EMI by controlling switching harmonics.
What package type and temperature grade does the LTC1871EMS-7#TRPBF use?
The LTC1871EMS-7#TRPBF is supplied in a 10-lead MSOP package (3mm × 3mm) with lead-free finish and tape-and-reel packaging (#TRPBF suffix). It is rated for an operating junction temperature range of –40°C to +85°C (E-grade), with thermal resistance θJA = 120°C/W. This makes it suitable for commercial and industrial environments where moderate ambient temperatures and board-level airflow are present.
LTC1871EMS-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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC1871EMS-7#TRPBF FAQ
1.How can I place an order for LTC1871EMS-7#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1871EMS-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 LTC1871EMS-7#TRPBF reliable?
The price and inventory of LTC1871EMS-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 LTC1871EMS-7#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1871EMS-7#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1871EMS-7#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1871EMS-7#TRPBF?
LTC1871EMS-7#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1871EMS-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 LTC1871EMS-7#TRPBF?
For technical support, including LTC1871EMS-7#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1871EMS-7#TRPBF requirements.
6.How does Aetrix verify that LTC1871EMS-7#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1871EMS-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 LTC1871EMS-7#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1871EMS-7#TRPBF?
All LTC1871EMS-7#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1871EMS-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 LTC1871EMS-7#TRPBF part is unused and in its original packaging.
Return procedure for LTC1871EMS-7#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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