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Analog Devices Inc. LTC1871EMS-7#PBF
- Part No.:
- LTC1871EMS-7#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1871EMS-7#PBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,769
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Product details
Overview
LTC1871EMS-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 switching frequency (50kHz–1MHz), 92% max duty cycle, ±1% internal reference, 7V internal LDO regulator, and Burst Mode® operation for micropower efficiency.
For engineers reviewing the LTC1871EMS-7#PBF datasheet, LTC1871EMS-7#PBF pinout, LTC1871EMS-7#PBF application, or LTC1871EMS-7#PBF equivalent, key selection criteria include INTVCC UVLO thresholds (5.6V/4.6V), RUN pin hysteresis (100mV), SENSE pin max threshold (150mV), GATE driver rise/fall times (17ns/8ns), and compatibility with no-RSENSE™ operation below 36V VDS.
Technical Context
The LTC1871EMS-7#PBF implements a constant-frequency, current-mode control architecture with slope compensation, enabling stable operation up to 92% duty cycle in CCM. Its error amplifier (600 µmho transconductance) drives the ITH pin to modulate peak current sensing via the SENSE input, supporting both source-sense and drain-sense configurations.
Internal circuitry includes a 7V LDO regulator (6.5–7.5V output, 50mA capability) with dedicated undervoltage lockout (5.6V rising / 4.6V falling), a programmable oscillator synchronized via MODE/SYNC pin (up to 1.3× fOSC), and dual-mode operation: Burst Mode® (≤250µA quiescent) or continuous/pulse-skip mode (enabled by >2V on MODE/SYNC).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency Range | 50kHz to 1MHz, set by single resistor on FREQ pin; enables tradeoff between efficiency and magnetics size. |
| Max Duty Cycle | 92% typical; supports high step-up ratios in boost/flyback without instability in CCM. |
| INTVCC Regulator Output | 7.0V ±0.5V; powers gate driver and logic; requires ≥4.7µF local ceramic bypass. |
| SENSE Pin Threshold | 150mV typical; sets peak current limit; supports no-RSENSE™ operation when VDS < 36V. |
| RUN Pin Threshold Hysteresis | 100mV; provides noise-immune enable/disable control with 1.248V falling threshold. |
| Shutdown Quiescent Current | 10µA typical; enables long battery life in always-on monitoring circuits. |
| FB Voltage Accuracy | ±1% over temperature; ensures precise output voltage regulation (1.230V nominal reference). |
Pinout & Package
Package: 10-lead MSOP (3mm × 3mm), exposed pad, rated for –40°C to 85°C (E-grade). Thermal resistance θJA = 120°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (1) | Enable/UVLO Input | Micro-power comparator input with 1.248V falling threshold and 100mV hysteresis; controls startup/shutdown. |
| ITH (2) | Error Amplifier Output | Compensation node; voltage (0.3–1.23V) sets current comparator threshold for loop control. |
| FB (3) | Feedback Input | Connects to resistor divider; regulates output by comparing to 1.230V internal reference. |
| FREQ (4) | Oscillator Programming | Resistor-to-ground sets frequency; nominal 0.62V bias; supports external sync via MODE/SYNC. |
| MODE/SYNC (5) | Operating Mode Control | GND = Burst Mode®; ≥2V or clock signal = continuous/pulse-skip mode; internal 50kΩ pull-down. |
| GND (6) | Power & Signal Ground | Common return for all analog and power circuits; must be low-impedance connection. |
| GATE (7) | MOSFET Driver Output | Capable of driving 3300pF load with 17ns rise/8ns fall time; optimized for 6V-rated MOSFETs. |
| INTVCC (8) | Internal LDO Output | 7V supply for gate driver and core logic; UVLO at 5.6V/4.6V; bypass with ≥4.7µF ceramic capacitor. |
| VIN (9) | Main Supply Input | 6V–36V operating range; powers internal bias circuits; requires local high-frequency decoupling. |
| SENSE (10) | Current Sense Input | Accepts voltage from MOSFET RDS(on) or external shunt; 150mV threshold; includes leading-edge blanking. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE™ Operation | SENSE pin connects directly to MOSFET drain for VDS < 36V, eliminating sense resistor losses and board space. |
| Burst Mode® Efficiency | Reduces quiescent current to 250µA in sleep mode, extending battery runtime in low-load telecom/industrial standby. |
| High-Voltage Input Support | Operates from 6V to 36V VIN and tolerates 36V on SENSE pin, enabling direct use in 24V/42V automotive and industrial rails. |
| Programmable Frequency Sync | MODE/SYNC pin accepts external clock up to 1.3× fOSC, allowing EMI reduction via fixed-frequency synchronization. |
| Robust Gate Drive | Fast 17ns/8ns rise/fall times into 3300pF load ensure efficient switching of low-Qg 6V MOSFETs at high frequencies. |
| Output Overvoltage Protection | FB pin OV comparator triggers reset pulse when VFB exceeds reference by 6.5%, holding GATE off during fault. |
Applications
| Telecom Housekeeping Supply | 42V Automotive Power Module |
|---|---|
Use Scenario: Generating isolated 12V/0.4A auxiliary rail from 36–72V telecom rectified bus for management ICs and interface circuitry. IC Role / Device Role / Timing Role: Primary controller in non-isolated flyback topology; regulates output via FB pin while sensing primary-side current on SENSE pin. Use Value: Enables compact, high-efficiency design using 6V MOSFETs and no external current sense resistor, reducing BOM cost and thermal stress. |
Use Scenario: Providing regulated 5V/3.3V rails from 42V vehicle battery for ADAS sensors and infotainment subsystems with cold-crank tolerance. IC Role / Device Role / Timing Role: Boost controller managing wide-input transient conditions; RUN pin programmed for 9V turn-on/7V turn-off to survive cranking dips. Use Value: 92% max duty cycle and 36V SENSE rating allow reliable operation during 4.5V–42V input transients without topology change or derating. |
| 24V Industrial Control PSU | IP Phone Power Adapter |
Use Scenario: Delivering 12V/1A from 24V factory floor supply to PLC I/O modules requiring low-noise, high-reliability DC/DC conversion. IC Role / Device Role / Timing Role: SEPIC controller maintaining regulation during brownouts; MODE/SYNC pin tied to INTVCC for fixed-frequency pulse-skip operation. Use Value: Fixed-frequency operation minimizes conducted EMI in noise-sensitive automation environments; 1% FB reference ensures tight output tolerance. |
Use Scenario: Compact wall adapter converting 100–240VAC to 12VDC for VoIP phones, where standby power consumption must meet Energy Star requirements. IC Role / Device Role / Timing Role: Flyback controller operating in Burst Mode® below 100µA load; shutdown IQ of 10µA meets ultra-low standby targets. Use Value: Micropower shutdown and Burst Mode® reduce no-load consumption to <30mW, exceeding Level VI efficiency standards. |
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 |
|---|---|---|---|
| LTC3787EMSE#PBF | Higher integration: includes 75V MOSFET drivers, adjustable soft-start, and current sharing; requires external VCC supply. | Targeted at higher-power (>50W), multi-phase, or synchronous rectified designs; not pin-compatible. | Select for systems needing integrated high-side drive or parallel operation; avoid if BOM simplicity and 6V MOSFET optimization are priorities. |
| LM5122MMX/NOPB | Wider VIN range (3–65V); no internal LDO; requires external 5V bias; lower FB reference (0.8V); no Burst Mode®. | Better suited for high-input industrial converters with external bias availability; lacks micropower shutdown for battery apps. | Choose when input exceeds 36V or external bias is already present; reject if 10µA shutdown or 7V LDO simplification is required. |
Compared with LTC1871EMS-7#PBF, LTC3787EMSE#PBF adds system-level features at the cost of complexity and pin-incompatibility, while LM5122MMX/NOPB trades micropower capability and integrated LDO for extended input voltage and external bias flexibility - making LTC1871EMS-7#PBF optimal for cost-sensitive, battery-aware, 6V-MOSFET-based 24–42V applications.
Availability
LTC1871EMS-7#PBF 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 guaranteed RoHS-compliant lead-free finish.
Supply support for LTC1871EMS-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 acquired Linear Technology in 2017 and maintains its precision analog and power management portfolio with full backward compatibility and enhanced quality assurance.
The LTC1871EMS-7#PBF belongs to Linear's high-voltage current-mode controller family, designed specifically for efficient, compact DC/DC conversion in telecom, automotive, and industrial power systems where 6V MOSFETs and micropower operation are critical.
FAQ
What is the maximum input voltage the LTC1871EMS-7#PBF can handle?
The LTC1871EMS-7#PBF supports a main supply input (VIN) range of 6V to 36V, with absolute maximum rating of 36V. The SENSE pin tolerates up to 36V, enabling no-RSENSE™ operation only when MOSFET drain-source voltage remains below this threshold. Exceeding 36V on VIN or SENSE risks permanent damage per Absolute Maximum Ratings.
How does the RUN pin function in the LTC1871EMS-7#PBF?
The RUN pin on the LTC1871EMS-7#PBF provides micropower enable/disable control with a precise 1.248V falling threshold and 100mV hysteresis. When pulled below threshold, the LTC1871EMS-7#PBF enters shutdown with 10µA typical quiescent current. A resistor divider from VIN to GND programs custom turn-on/turn-off voltages, supporting cold-crank survival in automotive applications.
Can the LTC1871EMS-7#PBF drive MOSFETs without an external current sense resistor?
Yes - the LTC1871EMS-7#PBF supports no-RSENSE™ operation by connecting the SENSE pin directly to the MOSFET drain, provided VDS stays below 36V. This eliminates sense resistor losses and PCB area but limits maximum output voltage. For outputs >36V or precise peak-current control, connect SENSE to a source-side shunt resistor instead.
What is the purpose of the MODE/SYNC pin on the LTC1871EMS-7#PBF?
The MODE/SYNC pin on the LTC1871EMS-7#PBF selects operating mode: grounded or open enables Burst Mode® for ultralow IQ; tied to INTVCC or driven above 2V disables Burst Mode® for continuous/pulse-skip operation. It also accepts external clock signals up to 1.3× fOSC for EMI-controlled synchronization, with internal 50kΩ pull-down ensuring default Burst Mode® behavior.
Does the LTC1871EMS-7#PBF include an internal voltage regulator?
Yes - the LTC1871EMS-7#PBF integrates a 7V low-dropout (LDO) regulator on the INTVCC pin, delivering up to 50mA to power the gate driver and internal logic. It features undervoltage lockout at 5.6V (rising) and 4.6V (falling), and requires ≥4.7µF local ceramic bypass capacitance. For inputs ≤8V, INTVCC may be shorted to VIN, though this increases shutdown current.
LTC1871EMS-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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC1871EMS-7#PBF FAQ
1.How can I place an order for LTC1871EMS-7#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1871EMS-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 LTC1871EMS-7#PBF reliable?
The price and inventory of LTC1871EMS-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 LTC1871EMS-7#PBF is usually 5 days.
3.What payment methods are accepted for LTC1871EMS-7#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1871EMS-7#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1871EMS-7#PBF?
LTC1871EMS-7#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1871EMS-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 LTC1871EMS-7#PBF?
For technical support, including LTC1871EMS-7#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1871EMS-7#PBF requirements.
6.How does Aetrix verify that LTC1871EMS-7#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1871EMS-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 LTC1871EMS-7#PBF meets industry standards.
7.What is the process for return or replacement of LTC1871EMS-7#PBF?
All LTC1871EMS-7#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1871EMS-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 LTC1871EMS-7#PBF part is unused and in its original packaging.
Return procedure for LTC1871EMS-7#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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