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Analog Devices Inc. LT8711IFE#TRPBF
- Part No.:
- LT8711IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8711IFE#TRPBF.pdf
- Description:
- IC REG CTRLR SYNC 20-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,554
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Product details
Overview
LT8711IFE#TRPBF from Analog Devices is a micropower synchronous multitopology DC/DC controller supporting buck, boost, SEPIC, ZETA, and nonsynchronous buck-boost configurations with 4.5V–42V input range, 15µA Burst Mode quiescent current, and 100kHz–750kHz programmable switching frequency. It enables high-efficiency battery-powered and automotive power conversion where input regulation, wide VIN tolerance, and topology flexibility are critical.
For engineers reviewing the LT8711IFE#TRPBF datasheet, LT8711IFE#TRPBF pinout, LT8711IFE#TRPBF application, or LT8711IFE#TRPBF equivalent, this page delivers verified technical context, validated pin functions, confirmed topology-specific operation modes, and real-world design constraints for automotive, solar, and industrial DC/DC systems.
Technical Context
The LT8711IFE#TRPBF implements constant-frequency current-mode PWM control with dual gate drivers (2A TG/2A BG), integrated slope compensation, and independent UVLO on INTVCC (3.6V) and INTVEE (3.85V across BIAS–INTVEE). Its OPMODE pin selects topology by grounding (buck/ZETA), connecting to INTVCC (SEPIC/boost), or using a 100pF capacitor to GND (nonsynchronous buck-boost).
It supports automatic low-noise Burst Mode operation below light-load thresholds, with VC-based peak current limiting governed by either FB (0.800V reference) for output voltage regulation or EN/FBIN (1.200V reference) for input voltage regulation - both directly modulating commanded switch current via the PWM comparator's negative input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 42V; operates down to 0V when EXTVCC > 4.5V - enables cold-cranking support in automotive systems |
| Quiescent Current (Burst Mode) | 15µA typical - extends runtime in battery-backed industrial sensors and telematics modules |
| Switching Frequency Range | 100kHz to 750kHz free-running; synchronizable to external clock - allows EMI optimization and noise-sensitive analog subsystem coexistence |
| Gate Drive Capability | 2A sink/source for TG (BIAS–INTVEE rails) and BG (GND–INTVCC rails) - drives large MOSFETs for >3A output currents without external drivers |
| FB Regulation Voltage | 0.800V ±16mV - sets precise output voltage via standard resistor divider; enables 12V, 5V, 3.3V, or custom rail generation |
| Topology Selection | Dedicated OPMODE pin configures buck/ZETA, SEPIC/boost, or nonsynchronous buck-boost - eliminates firmware or external logic for multi-rail designs |
| Current Sense Threshold | 46mV to 54mV (CSP–CSN) - defines peak current limit with <±8% tolerance; supports accurate overcurrent protection in high-side sensing |
Pinout & Package
LT8711IFE#TRPBF is packaged in a 20-lead TSSOP with exposed thermal pad (Pin 21 = GND), rated for –40°C to +125°C junction temperature and θJA = 38°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/FBIN (1,19) | Enable & Input Voltage Regulation Input | Enables chip above 1.03V; initiates soft-start above 1.35V; regulates input current when driven between 1.12V–1.27V |
| FB (2,20) | Output Voltage Feedback Input | Servo input to internal 0.800V reference; determines regulated output voltage via resistor divider |
| VC (3,1) | Error Amplifier Output | Integrates regulation error; connects to external compensation network for loop stability |
| SS (4,2) | Soft-Start Timing Node | Charged by internal 410kΩ resistor; external capacitor sets ramp rate for controlled current rise |
| OPMODE (5,3) | Topology Configuration Input | GND = buck/ZETA; INTVCC = SEPIC/boost; 100pF to GND = nonsynchronous buck-boost |
| ISP/ISN (6,7 / 4,5) | High-Side Current Sense Inputs | Kelvin-connected to sense resistor; used for input current limiting and DCM detection |
| INTVEE (8,6) | TG Driver Bottom Rail | 5.15V below BIAS; must exceed 3.85V (BIAS–INTVEE) before TG switching begins |
| BIAS (9,7) | TG Driver Top Rail | Supplies PFET gate drive; requires ≥2.2µF bypass to INTVEE; enables high-side FET control |
| TG (10,8) | PFET Gate Driver Output | 2A driver swinging between INTVEE and BIAS; non-overlap timing prevents shoot-through |
| BG (11,10) | NFET Gate Driver Output | 2A driver swinging between GND and INTVCC; complements TG in synchronous topologies |
| INTVCC (13,12) | Logic & BG Driver Supply | 5.0V LDO powered from VIN or EXTVCC; enables BG switching above 4.1V; supports 10mA load |
| VIN (14,13) | Main Input Supply | Primary power path; can be 0V if EXTVCC > 4.5V - supports dual-input redundancy |
| EXTVCC (15,14) | Alternate Input Supply | Backup supply path; can be 0V if VIN > 4.5V - ensures operation during cold crank or brownout |
| CSP/CSN (16,17 / 15,16) | Input Current Sense Inputs | Kelvin-connected to input-side sense resistor; sets peak current limit up to 54mV |
| SYNC (19,17) | External Clock Synchronization | Drives high (>1.3V) for FCM; low (<0.4V) for Burst Mode/DCM; accepts 140–750kHz external clocks |
| RT (20,18) | Frequency Setting Resistor | Resistor to GND sets fSW; 30.3kΩ = 675kHz, 247kΩ = 85kHz - enables precise EMI tuning |
| GND (21,21) | Power & Signal Reference | Exposed thermal pad must be soldered to PCB ground plane for thermal and electrical integrity |
Key Features
| Feature | Design Value |
|---|---|
| Topology Flexibility | Single IC supports five converter types via OPMODE pin - reduces BOM count and simplifies platform power architecture |
| Ultra-Low Quiescent Current | 15µA in Burst Mode - meets automotive ISO 16750-2 sleep mode requirements for always-on ECUs |
| Input Voltage Regulation | EN/FBIN pin provides direct input current limiting at 1.200V reference - protects high-impedance sources like solar panels |
| 100% Duty Cycle Capability | Supported in buck mode - maintains regulation during deep input voltage drop (e.g., automotive cranking) |
| Integrated Dual LDOs | INTVCC (5.0V) and INTVEE (BIAS–5.15V) enable independent gate drive rails - eliminates need for external bias supplies |
| Robust Protection Suite | UVLO on VIN/EXTVCC, INTVCC, INTVEE; overtemperature shutdown at 165°C; non-overlap timing - ensures reliable field operation |
Applications
| Automotive Infotainment Power | Solar Charge Controller Interface |
|---|---|
Use Scenario: Powers 12V display backlight and 5V MCU in vehicle head unit with battery input ranging from 6V (cold crank) to 16V (load dump). IC Role / Device Role / Timing Role: Multitopology controller configured as buck-boost to maintain stable 12V/5V outputs across wide input transients. Use Value: 100% duty cycle in buck mode sustains regulation at 6V input; 15µA Burst Mode minimizes parasitic drain during ignition-off state. | Use Scenario: Interfaces photovoltaic panel (20–45V) to 12V battery bank with MPPT algorithm requiring precise input current control. IC Role / Device Role / Timing Role: Nonsynchronous buck-boost controller using EN/FBIN for input voltage regulation and ISP/ISN for current sensing. Use Value: Input regulation loop maintains optimal panel operating point; 42V max VIN tolerates open-circuit PV voltage spikes. |
| Industrial Sensor Node Supply | Programmable Lab Power Module |
Use Scenario: Powers ultra-low-power wireless sensor node (sub-100µA sleep current) from single LiSOCl₂ cell (3.6V) with 5V/3.3V outputs. IC Role / Device Role / Timing Role: Boost converter configured via OPMODE=INTVCC to step up 3.6V to 5V/3.3V with adjustable soft-start. Use Value: 15µA quiescent current extends 10-year battery life; 100kHz–750kHz frequency tuning avoids RF interference with LoRaWAN transmission. | Use Scenario: Modular bench supply with digitally adjustable 1.2–30V output, 0–3A current limit, and remote sense capability. IC Role / Device Role / Timing Role: SEPIC controller (OPMODE=INTVCC) enabling bidirectional voltage conversion and seamless transition between CV/CC modes. Use Value: Input/output isolation via SEPIC topology prevents ground loop issues; CSP/CSN current sensing enables accurate 0.1A current limit resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multitopology controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3789EFE#TRPBF | Higher 40V max VIN; includes I²C interface and PMBus support; no OPMODE pin - fixed boost/buck-boost only | Requires external microcontroller for topology change; better suited for digitally managed power systems | Select when digital monitoring/control is required and topology flexibility is secondary |
| LM5170QQRGERQ1 | Automotive-grade (AEC-Q100); 65V max VIN; integrated current sense amplifiers; no built-in Burst Mode | Designed for high-reliability traction inverters and DC fast charging interfaces | Select for ASIL-B automotive applications needing higher voltage rating and functional safety compliance |
Compared with LTC3789EFE#TRPBF and LM5170QQRGERQ1, LT8711IFE#TRPBF offers unique manual topology selection via OPMODE pin, lowest 15µA Burst Mode IQ, and widest 4.5V–42V input range among pin-compatible controllers - making it optimal for cost-sensitive, thermally constrained, or manually configured industrial and automotive converters.
Availability
LT8711IFE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, solar charge controllers, and industrial sensor nodes requiring stable component supply, extended temperature operation (–40°C to +125°C), and long-term lifecycle continuity.
Supply support for LT8711IFE#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.
The LT8711IFE#TRPBF belongs to Analog Devices' Power by Linear™ multitopology controller family, designed specifically for flexible, high-efficiency DC/DC conversion in space-constrained and thermally demanding environments where input voltage variation and topology adaptability are critical.
FAQ
What topology configurations does the LT8711IFE#TRPBF support?
The LT8711IFE#TRPBF supports five distinct topologies: synchronous buck, boost, SEPIC, ZETA, and nonsynchronous buck-boost. Configuration is achieved solely through the OPMODE pin - grounded for buck/ZETA, tied to INTVCC for SEPIC/boost, or connected to a 100pF capacitor to GND for nonsynchronous buck-boost. No firmware or external logic is needed, and all configurations use the same LT8711IFE#TRPBF silicon.
How does the LT8711IFE#TRPBF achieve 15µA quiescent current in Burst Mode?
The LT8711IFE#TRPBF achieves 15µA typical quiescent current by fully disabling switching and most internal circuitry between bursts, retaining only essential bias and wake-up logic. This occurs automatically when load current drops below the threshold that maintains VC above its Burst Mode entry point. The LT8711IFE#TRPBF datasheet confirms this value under VFB = VFB_REG + 3mV conditions, making it ideal for battery-critical applications.
Can the LT8711IFE#TRPBF operate with input voltage below 4.5V?
Yes - the LT8711IFE#TRPBF can operate with VIN as low as 0V provided EXTVCC exceeds 4.5V, and conversely, EXTVCC can be 0V if VIN exceeds 4.5V. This dual-input capability is enabled by the internal logic selecting the optimal source for the INTVCC LDO. However, absolute minimum for either rail remains 4.5V to exit UVLO; operation below that disables the LT8711IFE#TRPBF.
What is the purpose of the EN/FBIN pin beyond chip enable?
Beyond enabling the LT8711IFE#TRPBF, the EN/FBIN pin serves as an input voltage regulation input. When driven between 1.12V and 1.27V, it commands a proportional reduction in peak switch current to prevent input collapse - critical for high-impedance sources like solar panels or long cables. This function is independent of FB-based output regulation and directly modulates the PWM comparator's reference via EA2 amplifier.
Does the LT8711IFE#TRPBF require external components for soft-start, and how is it implemented?
Yes - soft-start for the LT8711IFE#TRPBF is implemented using an external capacitor on the SS pin. An internal 410kΩ resistor charges this capacitor from 0V to ~4.3V, linearly ramping the peak current limit. Typical values range from 100nF to 1µF, setting start-up time from ~40ms to 400ms. During fault conditions (UVLO, overtemperature), the SS pin is actively discharged to reset the soft-start sequence - a behavior confirmed in the LT8711IFE#TRPBF block diagram and startup flowchart.
LT8711IFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- PWM
- Function:
- Step-Up, Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Boost, Buck-Boost, SEPIC
- Number of Outputs:
- 1
- Output Phases:
- -
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 42V
- Frequency - Switching:
- 100kHz ~ 750kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- No
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LT8711IFE#TRPBF FAQ
1.How can I place an order for LT8711IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8711IFE#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 LT8711IFE#TRPBF reliable?
The price and inventory of LT8711IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8711IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8711IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8711IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8711IFE#TRPBF?
LT8711IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8711IFE#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 LT8711IFE#TRPBF?
For technical support, including LT8711IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8711IFE#TRPBF requirements.
6.How does Aetrix verify that LT8711IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8711IFE#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 LT8711IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8711IFE#TRPBF?
All LT8711IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8711IFE#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 LT8711IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8711IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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