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Analog Devices Inc. LTC1871EMS#TRPBF
- Part No.:
- LTC1871EMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1871EMS#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:15,665
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Product details
Overview
LTC1871EMS#TRPBF from Analog Devices (formerly Linear Technology) is a wide-input, current-mode DC/DC controller for boost, flyback, and SEPIC topologies that drives an external N-channel MOSFET without requiring a discrete sense resistor-leveraging the MOSFET's RDS(ON) for current sensing. It operates from 2.5V to 36V input, delivers up to 92% duty cycle, supports 50kHz–1MHz programmable frequency, and features Burst Mode® operation for <10μA shutdown current-ideal for battery-powered telecom and portable power supplies.
For engineers reviewing the LTC1871EMS#TRPBF datasheet, LTC1871EMS#TRPBF pinout, LTC1871EMS#TRPBF application, or LTC1871EMS#TRPBF equivalent, key selection criteria include its no-RSENSE™ current sensing architecture, MODE/SYNC-controlled mode selection (Burst vs. pulse-skip), 1.230V ±1% internal reference, 10-lead MSOP package with thermal resistance θJA = 120°C/W, and compatibility with high-efficiency, low-component-count DC/DC designs.
Technical Context
The LTC1871EMS#TRPBF implements constant-frequency current-mode control using an internal 1.230V reference and transconductance error amplifier (gm = 650 μmho) to generate ITH voltage, which sets the peak current comparator threshold. Its SENSE pin supports dual sensing methods: direct VDS sensing across the MOSFET (for ≤36V output) or source-resistor sensing (for higher outputs), with leading-edge blanking and 150mV typical maximum sense threshold.
Frequency is set via a single resistor on FREQ (0.62V nominal), and synchronization is supported up to 1.3× fOSC on MODE/SYNC with 25ns minimum pulse width. RUN pin provides micropower enable/disable with ±2% threshold (1.248V falling, 1.348V rising) and 100mV hysteresis; INTVCC integrates a 5.2V LDO capable of 50mA output with 280mV dropout at 20mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 36V - enables direct operation from single-cell Li-ion to 24V industrial rails without pre-regulation. |
| Feedback Reference Voltage | 1.230V ±1% - sets precise output regulation accuracy; used with external resistor divider to program VOUT. |
| Operating Frequency Range | 50kHz to 1MHz - adjustable via single RT resistor; balances efficiency (lower f) vs. size (higher f). |
| Max Duty Cycle | 92% typical - supports high step-up ratios in boost/flyback, e.g., 3.3V→12V or 5V→24V. |
| Shutdown Quiescent Current | 10μA typical - extends battery life in always-on, low-power standby modes. |
| SENSE Pin Threshold | 150mV typical - defines peak current limit when sensing MOSFET RDS(ON); enables no-RSENSE™ efficiency gain. |
| GATE Driver Rise/Fall Time | 17ns/8ns (CL = 3300pF) - ensures fast switching with low gate charge MOSFETs, minimizing transition losses. |
| INTVCC LDO Output | 5.2V ±0.2V - powers internal logic and gate driver; bypassed with ≥4.7μF capacitor for transient current support. |
Pinout & Package
Package: 10-lead plastic MSOP (3mm × 3mm, 0.5mm pitch), rated for –40°C to +85°C operating temperature (E-grade). Thermal resistance θJA = 120°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (1) | Enable/UVLO input | Programmable start-up/shutdown threshold (1.248V falling); 100mV hysteresis prevents chatter near turn-on point. |
| ITH (2) | Error amplifier output | Controls current comparator threshold; voltage range 0.3V–1.4V determines peak inductor current. |
| FB (3) | Feedback input | Compares divided output voltage to 1.230V reference; high-impedance (≤60nA bias) minimizes divider error. |
| FREQ (4) | Frequency programming | 0.62V nominal; RT-to-ground sets oscillator frequency from 50kHz–1MHz with ±10% tolerance. |
| MODE/SYNC (5) | Mode control / clock sync | Ground = Burst Mode; >2V = pulse-skip; external clock = synchronization up to 1.3× fOSC. |
| GND (6) | Power and signal ground | Common return for VIN, INTVCC, SENSE, and gate driver; must be low-impedance PCB plane. |
| GATE (7) | MOSFET gate driver output | Capable of driving ≥3300pF load; rise/fall times optimized for fast N-MOSFET switching. |
| INTVCC (8) | Internal LDO output | 5.2V supply for gate driver and logic; requires local 4.7μF ceramic/tantalum bypass to GND. |
| VIN (9) | Main power input | Supplies bias circuitry; accepts 2.5V–36V; must be decoupled with ≥22μF low-ESR capacitor. |
| SENSE (10) | Current sense input | Accepts VDS (MOSFET drain) or VRS (source resistor); 150mV threshold enables no-RSENSE™ operation. |
Key Features
| Feature | Design Value |
|---|---|
| No-RSENSE™ current sensing | Eliminates power loss and board space of external sense resistor by using MOSFET RDS(ON), improving efficiency >2% at medium loads. |
| Burst Mode® operation | Reduces light-load IQ to 250μA (typ) by disabling switching and entering sleep mode, extending battery runtime in portable systems. |
| Programmable frequency with sync capability | Single RT resistor sets 50kHz–1MHz range; MODE/SYNC pin accepts external clock up to 1.3× fOSC for EMI control in noise-sensitive systems. |
| Output overvoltage protection | FB overvoltage lockout triggers at +6.5% above 1.230V reference, forcing shutdown to protect downstream circuitry. |
| High-duty-cycle capability | 92% max duty cycle enables high step-up ratios in boost/flyback, supporting applications like USB PD 5V→9V/15V conversion. |
| Integrated 5.2V LDO | Self-contained gate driver supply eliminates need for external bias rail; 50mA output supports large-gate-charge MOSFETs. |
Applications
| Telecom Power Supplies | Portable Electronic Equipment |
|---|---|
Use Scenario: 48V telecom brick derating to 12V/5V intermediate bus in remote radio units. IC Role / Device Role / Timing Role: Flyback controller regulating isolated 12V output from 36–72V input; uses SENSE pin on MOSFET drain for efficiency-critical operation. Use Value: No-RSENSE™ architecture achieves >90% efficiency at 50% load, reducing heat sink requirements and enabling compact module design. |
Use Scenario: Single-cell Li-ion (2.7–4.2V) powered medical monitor requiring stable 5V USB output. IC Role / Device Role / Timing Role: Boost controller with Burst Mode enabled (MODE/SYNC = GND); RUN pin programmed for 2.8V UVLO to prevent brownout shutdown. Use Value: 10μA shutdown current extends shelf life; 50kHz–1MHz frequency tuning allows optimization for inductor size vs. EMI compliance. |
| Industrial Sensor Nodes | Automotive Infotainment Accessories |
Use Scenario: Battery-backed wireless sensor node with 3.3V MCU and RF transceiver, powered from coin cell or energy harvester. IC Role / Device Role / Timing Role: SEPIC controller supporting input down to 2.5V; uses pulse-skip mode (MODE/SYNC = INTVCC) for low-noise 3.3V output. Use Value: 1.230V ±1% reference ensures accurate ADC reference voltage; low 250μA Burst Mode IQ enables multi-year operation on primary cell. |
Use Scenario: USB-C car charger converting 9–16V automotive rail to 5V/9V/15V outputs. IC Role / Device Role / Timing Role: Primary-side boost controller in multi-output flyback; synchronized to system clock via MODE/SYNC to reduce conducted EMI. Use Value: 1.3× fOSC sync range allows alignment with CAN bus timing; 36V absolute max SENSE rating accommodates load dump transients. |
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#TRPBF | Wider input range (2.8V–100V), integrated high-side gate driver, no internal LDO; requires external bootstrap supply. | Better suited for high-voltage flyback (e.g., 48V PoE) but lacks no-RSENSE™ efficiency advantage below 36V. | Select LT3757EMS#TRPBF only when input exceeds 36V or when integrated high-side driver simplifies layout. |
| TPS40210DRCT | Fixed 1.25V reference, no Burst Mode, no MODE/SYNC sync, lower max duty cycle (85%), no internal LDO. | Requires external bias supply and external current sense resistor; less efficient at light loads and in compact designs. | Choose TPS40210DRCT only if cost sensitivity outweighs efficiency, thermal, and component count advantages of LTC1871EMS#TRPBF. |
Compared with LT3757EMS#TRPBF and TPS40210DRCT, the LTC1871EMS#TRPBF uniquely combines no-RSENSE™ sensing, integrated 5.2V LDO, Burst Mode®, and 1.230V precision reference-making it optimal for space-constrained, battery-operated, or efficiency-critical boost/SEPIC/flyback designs under 36V input.
Availability
LTC1871EMS#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, portable electronic equipment, industrial sensor nodes, and automotive infotainment accessories requiring stable component supply and long-term production continuity.
Supply support for LTC1871EMS#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving industrial, automotive, communications, and healthcare markets.
The LTC1871EMS#TRPBF belongs to Linear's legacy high-efficiency DC/DC controller product line, designed specifically for low-to-medium power boost, flyback, and SEPIC converters where efficiency, small solution size, and battery runtime are critical.
FAQ
What is the maximum input voltage the LTC1871EMS#TRPBF can handle?
The LTC1871EMS#TRPBF has an absolute maximum VIN rating of 36V. Its operational input range is specified from 2.5V to 36V. Exceeding 36V on VIN risks permanent damage per Absolute Maximum Ratings. For applications with transient overvoltages (e.g., automotive load dump), external clamping or pre-regulation is required before the LTC1871EMS#TRPBF input.
How does the no-RSENSE™ feature work in the LTC1871EMS#TRPBF?
The LTC1871EMS#TRPBF implements no-RSENSE™ by using the voltage drop across the external N-channel MOSFET's RDS(ON) as the current sense signal, connected directly to the SENSE pin. This eliminates power loss and board area associated with a discrete shunt resistor. The IC's 150mV typical sense threshold and internal leading-edge blanking ensure accurate peak current detection without added components.
Can the LTC1871EMS#TRPBF be synchronized to an external clock, and what are the limits?
Yes, the LTC1871EMS#TRPBF can be synchronized to an external clock applied to the MODE/SYNC pin. It locks to frequencies from 100% to 130% of its nominal oscillator frequency (fOSC). The external clock must exceed 2V for ≥25ns and have ≤80% duty cycle. Attempting synchronization above 1.3× fOSC risks inadequate slope compensation and subharmonic oscillation.
What is the purpose of the RUN pin on the LTC1871EMS#TRPBF, and how is it configured?
The RUN pin on the LTC1871EMS#TRPBF provides micropower enable/disable with precise UVLO. Its falling threshold is 1.248V (±2%) with 100mV hysteresis. A resistor divider from VIN to GND programs turn-on/off voltages: VIN(ON) = 1.348V × (1 + R2/R1), VIN(OFF) = 1.248V × (1 + R2/R1). Below threshold, the LTC1871EMS#TRPBF draws only 10μA.
Does the LTC1871EMS#TRPBF support output voltages higher than 36V?
Yes-the LTC1871EMS#TRPBF supports >36V outputs by connecting the SENSE pin to a resistor in the MOSFET source instead of the drain. This avoids exceeding the 36V absolute maximum rating on the SENSE pin while retaining current-mode control. The trade-off is reduced efficiency due to added sense resistor loss, but it enables high-voltage flyback or SEPIC designs beyond 36V.
LTC1871EMS#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 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#TRPBF FAQ
1.How can I place an order for LTC1871EMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1871EMS#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#TRPBF reliable?
The price and inventory of LTC1871EMS#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1871EMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1871EMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1871EMS#TRPBF?
LTC1871EMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1871EMS#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#TRPBF?
For technical support, including LTC1871EMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1871EMS#TRPBF requirements.
6.How does Aetrix verify that LTC1871EMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1871EMS#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1871EMS#TRPBF?
All LTC1871EMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1871EMS#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC1871EMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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