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Analog Devices Inc. LTC1871EMS-1#PBF
- Part No.:
- LTC1871EMS-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1871EMS-1#PBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,068
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Product details
Overview
LTC1871EMS-1#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 up to 92% duty cycle, features ±1% internal voltage reference, and supports programmable 50kHz–1MHz switching frequency - used in telecom power supplies and portable equipment where high efficiency and minimal BOM count are critical.
For engineers reviewing the LTC1871EMS-1#PBF datasheet, LTC1871EMS-1#PBF pinout, LTC1871EMS-1#PBF application, or LTC1871EMS-1#PBF equivalent, key selection considerations include its no-RSENSE operation via MOSFET RDS(ON) sensing, ultra-low pulse-skip threshold for stable light-load performance, 10-lead MSOP package with thermal resistance of 120°C/W, and compatibility with both burst mode and synchronized continuous mode.
Technical Context
The LTC1871EMS-1#PBF implements constant-frequency current-mode control using an internal 1.230V reference and transconductance error amplifier (650 μmho), with leading-edge blanking on the SENSE pin for robust VDS or shunt-based current sensing. Its oscillator supports resistor-programmed frequency (50kHz–1MHz) and external synchronization up to 1.3×fOSC, with slope compensation increased by ~30% during sync to prevent subharmonic oscillation above 50% duty cycle.
It integrates a 5.2V low-dropout regulator (280mV dropout at 20mA) powering gate driver and logic, plus overvoltage protection triggered at +6.5% FB excursion. The RUN pin provides micropower shutdown (10μA) with 1.248V falling threshold and 100mV hysteresis, while MODE/SYNC selects between Burst Mode (grounded), pulse-skip (tied to INTVCC), or external clock sync.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 36V - supports wide-range industrial and automotive inputs without pre-regulation. |
| Switching Frequency | 50kHz to 1MHz, set by single RT resistor - enables tradeoff between efficiency (lower f) and size (higher f). |
| Max Duty Cycle | 92% typical - allows high step-up ratios in boost/flyback designs with limited VIN–VOUT margin. |
| Feedback Reference | 1.230V ±1% - enables precise output voltage setting with standard resistor dividers. |
| Shutdown Current | 10μA typical - ensures ultra-low system standby power in battery-powered applications. |
| SENSE Threshold | 150mV typical - sets peak current limit when sensing MOSFET RDS(ON); adjustable via external resistor for >36V outputs. |
| INTVCC Regulator | 5.2V ±0.2V, 50mA max - powers gate driver and internal circuitry; requires ≥4.7μF local bypass. |
Pinout & Package
Package: 10-lead plastic MSOP (3mm × 3mm), exposed pad optional, θJA = 120°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (1) | Enable/UVLO input | 1.248V falling threshold with 100mV hysteresis; controls startup/shutdown with micropower (10μA) quiescent state. |
| ITH (2) | Error amplifier output | 0.3V–1.4V control voltage setting current comparator threshold; clamped at 0.525V in Burst Mode. |
| FB (3) | Feedback input | Compares divided output voltage to 1.230V reference; ±1% accuracy enables tight regulation. |
| FREQ (4) | Oscillator programming | 0.62V nominal; RT-to-ground sets frequency from 50kHz–1MHz with linear scaling. |
| MODE/SYNC (5) | Mode control / sync input | Ground = Burst Mode; INTVCC = pulse-skip; external clock ≤1.3×fOSC = synchronized continuous mode. |
| GND (6) | Power and signal ground | Common return for all analog and power paths; must be low-impedance connection to minimize noise. |
| GATE (7) | MOSFET gate driver output | Capable of driving high-side N-MOSFET; 17ns rise / 8ns fall time into 3300pF load. |
| INTVCC (8) | Internal LDO output | 5.2V supply for gate driver and logic; requires ≥4.7μF local ceramic/tantalum bypass capacitor. |
| VIN (9) | Main power input | Supplies bias for internal circuits; must be decoupled close to pin with low-ESR capacitor. |
| SENSE (10) | Current sense input | Accepts VDS across MOSFET (max 36V) or source-shunt voltage; includes leading-edge blanking. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE operation | Uses MOSFET RDS(ON) for current sensing - eliminates sense resistor losses, improves efficiency by ~2–3% and reduces BOM cost/size. |
| Ultra-low pulse-skip threshold | 195mV falling ITH voltage - maintains constant-frequency operation down to very light loads across wide input ranges. |
| Programmable burst/pulse-skip mode | MODE/SYNC pin selects between Burst Mode (250μA IQ), pulse-skip (no clamp), or sync - optimizes efficiency vs. EMI requirements. |
| Integrated 5.2V LDO | 280mV dropout at 20mA - powers gate driver independently of VIN, enabling reliable drive even at low input voltages. |
| Output overvoltage protection | +6.5% FB excursion triggers latch-off - prevents damage to downstream circuitry during feedback loop faults. |
Applications
| Telecom Power Supplies | Portable Electronic Equipment |
|---|---|
|
Use Scenario: 48V intermediate bus conversion to 5V/3.3V for base station RF modules and line cards. IC Role / Device Role / Timing Role: Primary-side current-mode controller managing boost topology with 36V input range and high duty cycle. Use Value: No-RSENSE operation avoids power loss in high-current paths, supporting >90% efficiency at 7A output per rail. |
Use Scenario: Single-cell Li-ion (3.0–4.2V) to 5V USB power bank output stage. IC Role / Device Role / Timing Role: Boost controller with programmable 500kHz frequency and Burst Mode for <100μA standby current. Use Value: Micropower shutdown (10μA) and low-pulse-skip threshold extend battery life during idle periods. |
| Industrial Sensors | Automotive Infotainment |
|
Use Scenario: 12V vehicle battery to isolated 5V/±15V for analog sensor signal conditioning in harsh environments. IC Role / Device Role / Timing Role: Flyback controller with SENSE pin connected to MOSFET drain, leveraging internal leading-edge blanking. Use Value: Wide -40°C to 85°C operating range (E-grade) and ±2% RUN threshold ensure reliable cold-cranking startup. |
Use Scenario: 9–16V automotive input to regulated 3.3V for microcontroller and display backlight drivers. IC Role / Device Role / Timing Role: SEPIC controller supporting input dips to 6V and surges to 36V without dropout or reset. Use Value: 92% max duty cycle and 1.248V RUN threshold with hysteresis prevent brownout-induced resets during load dump. |
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#PBF | Higher 100V VIN max, integrated VGS bootstrap diode, no internal LDO - requires external bias supply. | Better suited for >60V flyback/boost; lacks no-RSENSE feature and has higher minimum operating frequency (100kHz). | Select LT3757EMS#PBF when input exceeds 36V or bootstrap diode integration is preferred; not drop-in due to different pinout and bias architecture. |
| TPS40210DRCT | Fixed 1.25V reference, no Burst Mode, lower 3.5V min VIN, no internal LDO - requires external 5V bias. | Optimized for cost-sensitive mid-power boost; lacks pulse-skip flexibility and ultra-low-IQ shutdown. | Choose TPS40210DRCT for simpler, lower-cost designs below 30V input where light-load efficiency is secondary. |
Compared with LT3757EMS#PBF and TPS40210DRCT, the LTC1871EMS-1#PBF uniquely combines no-RSENSE operation, 2.5V start-up, micropower shutdown, and programmable burst/pulse-skip modes - making it optimal for compact, high-efficiency, wide-input portable and telecom power stages where BOM count and standby power are critical.
Availability
LTC1871EMS-1#PBF is available at Aetrix Electronics and suitable for telecom power supplies, portable electronic equipment, and industrial sensors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1871EMS-1#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 legacy Linear ICs including the LTC portfolio.
The LTC1871EMS-1#PBF belongs to Linear's high-efficiency DC/DC controller family, designed specifically for space-constrained, wide-input boost/flyback/SEPIC applications where minimizing sense losses and optimizing light-load behavior are essential.
FAQ
What is the minimum input voltage required for LTC1871EMS-1#PBF to start switching?
The LTC1871EMS-1#PBF has a guaranteed minimum input voltage of 2.5V for normal operation. Startup occurs when the RUN pin voltage exceeds 1.348V (rising threshold), which corresponds to VIN ≥ 2.5V assuming standard resistor divider design. Below 2.5V, the IC remains in shutdown with only 10μA quiescent current. The device is fully specified and tested down to this 2.5V level across temperature.
Can LTC1871EMS-1#PBF operate without an external sense resistor?
Yes, the LTC1871EMS-1#PBF is explicitly designed for no-RSENSE operation by sensing the voltage drop across the power MOSFET's RDS(ON). This is enabled by connecting the SENSE pin directly to the MOSFET drain. The IC includes internal leading-edge blanking to reject switching noise, and the 150mV typical sense threshold is calibrated for this method - eliminating power loss and board area associated with discrete shunts.
How does the MODE/SYNC pin affect LTC1871EMS-1#PBF's light-load efficiency?
The MODE/SYNC pin directly determines light-load behavior: grounded → Burst Mode (250μA IQ, periodic sleep); tied to INTVCC → pulse-skip mode (500μA IQ, discontinuous conduction); driven by external clock → synchronized continuous mode (~1mA IQ). For battery-powered systems, grounding MODE/SYNC maximizes runtime at microamp loads, while INTVCC connection minimizes output ripple in always-on applications.
What is the maximum output voltage achievable with LTC1871EMS-1#PBF?
The LTC1871EMS-1#PBF itself has no inherent output voltage limit - but the SENSE pin absolute maximum rating is 36V. When using drain-sensing (no-RSENSE), VOUT must stay ≤36V. For higher outputs, connect SENSE to a resistor in the MOSFET source - this shifts sensing to a lower-voltage node, enabling VOUT >100V in flyback configurations, as confirmed in Linear's application notes for LTC1871-1.
Is LTC1871EMS-1#PBF pin-compatible with the standard LTC1871EMS#PBF?
No - the LTC1871EMS-1#PBF is not pin-compatible with the base LTC1871EMS#PBF. While both share identical pinout and package, the -1 variant features a lower pulse-skip threshold (195mV vs. 300mV) and optimized light-load behavior. Electrical characteristics differ in ITH-related parameters and burst mode entry points; direct substitution may cause instability or incorrect light-load response without circuit review.
LTC1871EMS-1#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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC1871EMS-1#PBF FAQ
1.How can I place an order for LTC1871EMS-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1871EMS-1#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-1#PBF reliable?
The price and inventory of LTC1871EMS-1#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-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC1871EMS-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1871EMS-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1871EMS-1#PBF?
LTC1871EMS-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1871EMS-1#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-1#PBF?
For technical support, including LTC1871EMS-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1871EMS-1#PBF requirements.
6.How does Aetrix verify that LTC1871EMS-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1871EMS-1#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-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC1871EMS-1#PBF?
All LTC1871EMS-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1871EMS-1#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-1#PBF part is unused and in its original packaging.
Return procedure for LTC1871EMS-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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