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Analog Devices Inc. LTC1871IMS-7#PBF
- Part No.:
- LTC1871IMS-7#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1871IMS-7#PBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,325
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Product details
Overview
LTC1871IMS-7#PBF 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 programmable 50kHz–1MHz switching frequency, 92% typical max duty cycle, ±1% internal 1.230V reference, and integrated 7V LDO regulator with 5.6V/4.6V UVLO thresholds.
For engineers reviewing the LTC1871IMS-7#PBF datasheet, LTC1871IMS-7#PBF pinout, LTC1871IMS-7#PBF application, or LTC1871IMS-7#PBF equivalent, key selection criteria include its 6V–36V input range, Burst Mode® operation for micropower shutdown (10µA), MODE/SYNC-controlled mode selection, INTVCC-regulated gate drive, and SENSE-pin flexibility for RDS(ON)-based or shunt-based current sensing.
Technical Context
The LTC1871IMS-7#PBF implements a constant-frequency, current-mode control architecture with slope compensation, where the ITH pin voltage sets the peak current comparator threshold (0.3V–1.23V range). Its internal 7V LDO powers the gate driver and logic, with undervoltage lockout (5.6V rise / 4.6V fall) protecting MOSFET gate drive integrity at low input conditions.
Operating mode is selected via the MODE/SYNC pin: grounded for Burst Mode® (250µA sleep current), tied to INTVCC for pulse-skip mode, or driven by external clock up to 1.3×fOSC for synchronization. The RUN pin provides accurate 1.248V turn-on threshold with 100mV hysteresis for programmable input voltage enable/disable sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 36V - supports wide-range industrial and automotive inputs without external pre-regulation |
| Switching Frequency | 50kHz to 1MHz - set by single RT resistor; enables tradeoff between efficiency and magnetics size |
| Max Duty Cycle | 92% typical - enables high step-up ratios in boost/flyback, critical for low-VIN-to-high-VOUT conversion |
| INTVCC Regulator | 7.0V ±0.5V output - powers gate driver and internal circuitry; includes 5.6V/4.6V UVLO for MOSFET gate safety |
| Feedback Reference | 1.230V ±0.012V - high-accuracy reference enabling precise output voltage regulation (±1%) |
| Shutdown Current | 10µA typical - enables long battery life in always-on systems with controlled enable sequencing |
| RUN Pin Threshold | 1.248V rising / 1.148V falling - 100mV hysteresis ensures noise-immune input voltage monitoring and sequencing |
| SENSE Threshold | 150mV typical - sets current limit; supports No RSENSE™ operation when VDS < 36V |
Pinout & Package
Package: 10-lead MSOP (10-Lead Plastic MSOP), –40°C to 125°C operating junction temperature (I-grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 1) | Enable/UVLO Input | Programmable start-up/shutdown threshold (1.248V) with 100mV hysteresis; remains active in shutdown |
| ITH (Pin 2) | Error Amplifier Output | Controls peak current threshold (0.3V–1.23V range); clamped at 0.525V in Burst Mode® |
| FB (Pin 3) | Feedback Input | Compares output divider voltage to 1.230V reference; ±1% accuracy enables tight regulation |
| FREQ (Pin 4) | Oscillator Programming | Resistor-to-ground sets fOSC; nominal 0.62V bias enables predictable frequency selection |
| MODE/SYNC (Pin 5) | Mode Control / Clock Input | Selects Burst Mode®, pulse-skip, or external sync; internal 50kΩ pull-down enables default Burst Mode® |
| GND (Pin 6) | Power Ground | Reference for all analog and power circuits; must be low-impedance connection to minimize noise |
| GATE (Pin 7) | MOSFET Driver Output | Capable of driving 3300pF load with 17ns rise/8ns fall; powered by INTVCC rail |
| INTVCC (Pin 8) | Internal LDO Output | 7V regulated supply for gate driver and logic; requires ≥4.7µF local ceramic bypass |
| VIN (Pin 9) | Main Supply Input | 6V–36V primary input; powers internal bias and LDO; must be closely decoupled to GND |
| SENSE (Pin 10) | Current Sense Input | Accepts voltage from MOSFET RDS(ON) or external shunt; includes leading-edge blanking |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE™ Operation | Enables current sensing directly across MOSFET drain-source (VDS < 36V), eliminating sense resistor losses and board space |
| Burst Mode® Efficiency | Reduces light-load quiescent current to 250µA sleep mode, extending battery runtime in standby applications |
| High-Voltage Input Compatibility | Validated for 36V absolute max VIN and 36V SENSE pin rating - supports 42V automotive transients and telecom -48V systems |
| Programmable Frequency & Sync | Single-resistor frequency setting (50kHz–1MHz) plus external clock sync up to 1.3×fOSC for EMI control |
| Output Overvoltage Protection | Detects FB > 1.230V + 6.5% and forces latch-off - prevents damage to downstream loads during fault conditions |
| Robust Gate Drive | 7V INTVCC rail with fast 17ns/8ns rise/fall times into 3300pF - ensures reliable switching of low-RDS(ON) MOSFETs |
Applications
| Telecom Housekeeping Supply | 42V Automotive System |
|---|---|
Use Scenario: Generating isolated 12V/0.4A auxiliary power from 36V–72V telecom rectified bus for management controllers and interface ICs. IC Role / Device Role / Timing Role: Current-mode flyback controller managing primary-side regulation, synchronous rectification timing, and burst-mode light-load efficiency. Use Value: Eliminates need for external high-voltage gate driver; 92% duty cycle enables stable operation at minimum input (36V) while maintaining 12V output. |
Use Scenario: Powering infotainment head units and ADAS sensors from 12V battery with 42V load-dump transient tolerance. IC Role / Device Role / Timing Role: Boost controller regulating 5V/3A output from 6V–16V battery input, with RUN-pin sequencing for cold-crank detection. Use Value: 6V min VIN and 36V SENSE rating withstand 42V transients; 10µA shutdown current preserves battery during vehicle off-state. |
| 24V Industrial Control | IP Phone Power Supply |
Use Scenario: Providing 5V/2A isolated power for PLC I/O modules from 24V DC industrial bus with reverse-polarity and surge protection. IC Role / Device Role / Timing Role: SEPIC controller delivering non-inverting, input-output-isolated regulation with continuous conduction mode stability. Use Value: Wide 6V–36V input range accommodates brownouts and overvoltages; ±1% FB reference ensures sensor ADC accuracy. |
Use Scenario: Generating 3.3V/1A PoE-powered Ethernet phone supply from IEEE 802.3af 48V input using flyback topology. IC Role / Device Role / Timing Role: High-efficiency flyback controller with Burst Mode® for low standby power (<150mW) meeting Energy Star requirements. Use Value: 250µA Burst Mode® sleep current meets strict IP phone idle-power budgets; 10-lead MSOP fits compact PCB layouts. |
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 |
|---|---|---|---|
| LT3751EMS#PBF | Higher 100V VIN max, no integrated LDO; requires external 5V bias; 1.21V FB reference | Targeted at higher-input industrial/medical flyback designs; lacks Burst Mode® and RUN-pin sequencing | Choose for >36V input or when external bias is already available; avoid if micropower shutdown or input sequencing is required |
| UCC28C43DR | Fixed 1MHz frequency, no programmable fOSC, no Burst Mode®, 2.5V min VIN, 1.25V FB reference | Cost-optimized for fixed-frequency boost in consumer electronics; no high-voltage SENSE capability | Choose for simple, low-cost boost supplies below 24V input; avoid for telecom/automotive due to limited voltage range and no light-load efficiency mode |
Compared with LT3751EMS#PBF and UCC28C43DR, the LTC1871IMS-7#PBF uniquely combines 36V input capability, integrated 7V LDO, Burst Mode® efficiency, and RUN-pin programmable sequencing - making it optimal for space-constrained, battery-sensitive, or high-transient industrial/automotive flyback designs.
Availability
LTC1871IMS-7#PBF is available at Aetrix Electronics and suitable for telecom housekeeping supplies, 42V automotive systems, and 24V industrial controls requiring stable component supply, extended temperature operation, and long-term production continuity.
Supply support for LTC1871IMS-7#PBF 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.
The LTC1871IMS-7#PBF belongs to Linear's legacy high-voltage DC/DC controller product line, designed specifically for robust, efficient, and compact boost, flyback, and SEPIC power conversion in harsh environments.
FAQ
What is the maximum input voltage supported by the LTC1871IMS-7#PBF?
The LTC1871IMS-7#PBF supports an absolute maximum input voltage of 36V on the VIN pin and 36V on the SENSE pin. Its operational input range is 6V to 36V, making it suitable for 42V automotive load-dump tolerant designs and telecom -48V rectified bus applications. Exceeding 36V on VIN or SENSE risks permanent device damage per Absolute Maximum Ratings.
How does the MODE/SYNC pin control operating modes in the LTC1871IMS-7#PBF?
The MODE/SYNC pin on the LTC1871IMS-7#PBF selects three distinct modes: grounded (or open) enables Burst Mode® for ultra-low-light-load efficiency; tied to INTVCC enables pulse-skip mode for fixed-frequency DCM operation; and driven by an external clock (≥2V, ≥25ns pulse width) enables synchronization up to 1.3×fOSC. Each mode alters ITH clamping, quiescent current, and noise spectrum characteristics.
Can the LTC1871IMS-7#PBF operate without an external current sense resistor?
Yes - the LTC1871IMS-7#PBF supports No RSENSE™ operation by connecting the SENSE pin directly to the MOSFET drain, provided VDS remains below 36V. This eliminates sense resistor losses and improves efficiency in medium-power applications. For VDS > 36V or precise peak-current control, connect SENSE to a source-shunt resistor instead.
What is the purpose of the RUN pin on the LTC1871IMS-7#PBF, and how is it used?
The RUN pin on the LTC1871IMS-7#PBF provides a micropower (60nA typical) enable input with a precise 1.248V rising threshold and 100mV hysteresis. It allows programmable input voltage turn-on/off sequencing using a resistor divider from VIN. When pulled below 1.248V, the LTC1871IMS-7#PBF enters shutdown with only 10µA supply current, preserving system battery life.
Does the LTC1871IMS-7#PBF include overvoltage protection, and how does it work?
Yes - the LTC1871IMS-7#PBF includes dedicated output overvoltage protection. An internal comparator monitors the FB pin and triggers a reset pulse to the main PWM latch if FB exceeds 1.230V by more than 6.5% (i.e., >1.311V). This forces the GATE output low and holds the MOSFET off until the fault clears, safeguarding downstream loads from damaging overvoltage events.
LTC1871IMS-7#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC1871IMS-7#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1871IMS-7#PBF 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#PBF reliable?
The price and inventory of LTC1871IMS-7#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LTC1871IMS-7#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1871IMS-7#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1871IMS-7#PBF?
LTC1871IMS-7#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1871IMS-7#PBF 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#PBF?
For technical support, including LTC1871IMS-7#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1871IMS-7#PBF requirements.
6.How does Aetrix verify that LTC1871IMS-7#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1871IMS-7#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC1871IMS-7#PBF?
All LTC1871IMS-7#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1871IMS-7#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC1871IMS-7#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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