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Analog Devices Inc. LTC1871HMS#PBF
- Part No.:
- LTC1871HMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1871HMS#PBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:387
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Product details
Overview
LTC1871HMS#PBF 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 Burst Mode® operation for <10μA shutdown current-ideal for battery-powered telecom and portable power supplies.
For engineers reviewing the LTC1871HMS#PBF datasheet, LTC1871HMS#PBF pinout, LTC1871HMS#PBF application, or LTC1871HMS#PBF equivalent, key selection considerations include its no-RSENSE™ current sensing, 92% typical max duty cycle, –40°C to 150°C H-grade temperature rating, internal 5.2V LDO, and MODE/SYNC-controlled burst/continuous/synchronized operation modes.
Technical Context
The LTC1871HMS#PBF implements constant-frequency current-mode control with leading-edge blanking and slope compensation, using either MOSFET RDS(ON) sensing (for ≤36V VSW) or external source-resistor sensing (for higher output voltages). Its error amplifier drives the ITH pin (0.3V–1.4V range) to modulate peak inductor current, while the RUN pin provides micropower enable/disable with 1.248V falling threshold and 100mV hysteresis.
Internal architecture includes a 5.2V low-dropout regulator (±2.5% line/load regulation), programmable oscillator with external RT resistor, and MODE/SYNC pin supporting three distinct operating modes: Burst Mode (pin grounded), pulse-skip (pin tied to INTVCC), or external clock synchronization (up to 1.3× fOSC). Overvoltage protection triggers at +6.5% FB excursion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 36V - supports direct connection to 12V/24V industrial rails and single-cell Li-ion to 3S battery stacks. |
| Feedback Reference Voltage | 1.230V ±1% - enables precise output voltage setting (e.g., 5V via R1=12.1kΩ/R2=37.4kΩ) with minimal divider error. |
| Max Duty Cycle | 92% typical - allows high step-up ratios in boost mode (e.g., 3.3V→12V) without violating minimum off-time constraints. |
| Shutdown Quiescent Current | 10μA typical - extends battery life in always-on systems with infrequent wake-up cycles. |
| Operating Frequency Range | 50kHz to 1MHz - selectable via single RT resistor; balances efficiency (lower f) vs. size (higher f) for inductor/capacitor optimization. |
| Junction Temperature Range | –40°C to 150°C - qualified for under-hood automotive, industrial motor drives, and high-ambient embedded systems. |
| SENSE Pin Max Threshold | 150mV typical - sets current limit when using MOSFET RDS(ON); allows accurate peak-current control without sense resistor losses. |
Pinout & Package
Package: 10-lead MSOP (3mm × 3mm), exposed pad, RoHS-compliant lead-free finish (PBF), thermal resistance θJA = 120°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (1) | Enable/UVLO input | Micro-power comparator with 1.248V falling threshold and 100mV hysteresis; controls startup/shutdown without external bias. |
| ITH (2) | Error amplifier output | 0.3V–1.4V control voltage setting current comparator threshold; used for loop compensation and mode selection. |
| FB (3) | Feedback input | High-impedance node referenced to 1.230V; connects to resistor divider for output voltage regulation and OVP detection. |
| FREQ (4) | Oscillator programming | 0.62V reference node; RT resistor to GND sets switching frequency from 50kHz to 1MHz. |
| MODE/SYNC (5) | Mode control & sync input | Configures Burst Mode (GND), pulse-skip (INTVCC), or external clock sync (2V–7V logic); internal 50kΩ pull-down. |
| GND (6) | Power and signal ground | Common return for VIN, INTVCC, SENSE, and gate driver; requires low-inductance layout for stability. |
| GATE (7) | MOSFET gate driver output | Capable of driving >1nF load with 17ns rise/8ns fall time; optimized for fast N-channel switch turn-on/off. |
| INTVCC (8) | Internal LDO output | 5.2V ±2.5%, supplies gate driver and logic; requires ≥4.7μF local ceramic/tantalum bypass to GND. |
| VIN (9) | Main supply input | Accepts 2.5V–36V; powers internal bias circuits and charges INTVCC LDO; must be decoupled near IC. |
| SENSE (10) | Current sense input | Accepts voltage drop across MOSFET drain-source (≤36V) or source resistor; includes leading-edge blanking for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE™ current sensing | Uses MOSFET RDS(ON) for current measurement-eliminates 5–15% conduction loss and reduces BOM count by one precision resistor. |
| Wide input voltage range | 2.5V to 36V operation enables single-controller support across Li-ion, 12V automotive, and 24V industrial inputs without redesign. |
| Burst Mode® at light loads | Reduces quiescent current to 250μA in sleep mode-extends runtime in battery-powered devices with intermittent load profiles. |
| Programmable frequency & sync capability | RT resistor sets 50kHz–1MHz range; MODE/SYNC accepts external clock up to 1.3× fOSC for EMI-sensitive applications. |
| Integrated 5.2V LDO | Supplies gate driver and internal logic from VIN; eliminates need for external bias rail while maintaining 50mA output capability. |
| Output overvoltage protection | FB pin comparator trips at +6.5% reference deviation, forcing immediate gate shutdown-prevents downstream component damage. |
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 controller for isolated flyback converter delivering regulated outputs with tight transient response. Use Value: 92% max duty cycle and 150°C junction rating ensure reliable operation in sealed, fanless enclosures with ambient temperatures up to 85°C. |
Use Scenario: Single-cell Li-ion (3.0–4.2V) to 5V USB power bank with high-efficiency boost stage. IC Role / Device Role / Timing Role: Current-mode boost controller enabling compact design with minimal external components and no sense resistor. Use Value: 10μA shutdown current and Burst Mode® extend usable battery life by >30% versus fixed-frequency alternatives at <1mA load. |
| Industrial Motor Drives | Automotive Infotainment Systems |
Use Scenario: 24V vehicle battery to isolated 15V gate drive supply for BLDC inverter half-bridges. IC Role / Device Role / Timing Role: Flyback controller with SENSE pin connected to MOSFET source resistor for precise current limiting during stall conditions. Use Value: –40°C to 150°C H-grade qualification ensures uninterrupted operation during engine-off hot-soak testing (125°C ambient). |
Use Scenario: 12V automotive supply to 3.3V/1.8V rails for head unit processors and display drivers. IC Role / Device Role / Timing Role: SEPIC controller providing non-inverting buck-boost regulation tolerant of cold-crank (4.5V) and load-dump (40V) transients. Use Value: 36V SENSE pin rating and integrated OVP protect against load-dump-induced overvoltage events on feedback network. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3757AIMSE#PBF | Higher 100V SENSE rating; includes soft-start and fault flag; requires external VREF for FB scaling. | Supports >60V input flyback/boost; better suited for PoE, AC/DC adapters, and high-voltage industrial supplies. | Select LT3757AIMSE#PBF when input exceeds 36V or when integrated soft-start and fault reporting are required. |
| TPS40210DGQ | Fixed 1.25V FB reference; no Burst Mode; lower 1.5A gate drive; 4.5–40V input range. | Optimized for cost-sensitive industrial DC/DC; lacks no-RSENSE capability and high-temp H-grade qualification. | Choose TPS40210DGQ for non-battery applications where 150°C operation and ultra-low IQ are not required. |
Compared with LT3757AIMSE#PBF and TPS40210DGQ, the LTC1871HMS#PBF uniquely combines no-RSENSE™ efficiency, 150°C operation, and programmable Burst Mode-making it optimal for thermally constrained, battery-powered, or wide-temperature industrial converters where component count and standby power are critical.
Availability
LTC1871HMS#PBF is available at Aetrix Electronics and suitable for telecom power supplies, portable electronic equipment, industrial motor drives, and automotive infotainment systems requiring stable component supply across extended temperature ranges.
Supply support for LTC1871HMS#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 full product support, documentation, and manufacturing continuity for all Linear-branded ICs including the LTC1871 series.
The LTC1871 belongs to Linear's high-efficiency DC/DC controller family, designed specifically for low-to-medium power boost, flyback, and SEPIC converters where minimizing sense losses, simplifying layout, and extending battery life are primary system goals.
FAQ
What is the maximum input voltage the LTC1871HMS#PBF can handle?
The LTC1871HMS#PBF supports an absolute maximum VIN of 36V, with guaranteed operation from 2.5V to 36V across its full –40°C to 150°C junction temperature range. Exceeding 36V on VIN risks permanent damage per Absolute Maximum Ratings. For higher input applications, consider the LT3757AIMSE#PBF, which supports up to 100V on its SENSE pin and wider input ranges.
How does the LTC1871HMS#PBF achieve "No RSENSE™" current sensing?
The LTC1871HMS#PBF measures current by monitoring the voltage drop across the power MOSFET's RDS(ON) via the SENSE pin-eliminating the need for a discrete sense resistor. This method reduces conduction losses and BOM count. When VSW exceeds 36V, the SENSE pin can instead connect to a source-resistor for precise high-voltage current limiting.
Can the LTC1871HMS#PBF operate in continuous conduction mode (CCM) at light loads?
Yes-the LTC1871HMS#PBF supports CCM down to near its minimum on-time (~175ns) when MODE/SYNC is tied to INTVCC (pulse-skip mode). In this configuration, it skips switching cycles rather than entering Burst Mode, maintaining fixed frequency and lower output ripple-ideal for noise-sensitive analog circuitry powered by the LTC1871HMS#PBF.
What is the purpose of the RUN pin on the LTC1871HMS#PBF?
The RUN pin on the LTC1871HMS#PBF provides micropower enable/disable control with a precise 1.248V falling threshold and 100mV hysteresis. It allows users to program custom input UVLO thresholds using an external resistor divider-enabling controlled startup/shutdown in battery systems or brown-out protection in industrial supplies-all while drawing only 10μA in shutdown.
Does the LTC1871HMS#PBF include overvoltage protection?
Yes-the LTC1871HMS#PBF integrates an overvoltage comparator that monitors the FB pin. If FB exceeds the 1.230V reference by +6.5% (i.e., 1.31V), the comparator asserts a reset signal to the PWM latch, immediately disabling the GATE driver and preventing output overvoltage damage to downstream circuitry.
LTC1871HMS#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 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC1871HMS#PBF FAQ
1.How can I place an order for LTC1871HMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1871HMS#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 LTC1871HMS#PBF reliable?
The price and inventory of LTC1871HMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1871HMS#PBF is usually 5 days.
3.What payment methods are accepted for LTC1871HMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1871HMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1871HMS#PBF?
LTC1871HMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1871HMS#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 LTC1871HMS#PBF?
For technical support, including LTC1871HMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1871HMS#PBF requirements.
6.How does Aetrix verify that LTC1871HMS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1871HMS#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 LTC1871HMS#PBF meets industry standards.
7.What is the process for return or replacement of LTC1871HMS#PBF?
All LTC1871HMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1871HMS#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 LTC1871HMS#PBF part is unused and in its original packaging.
Return procedure for LTC1871HMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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