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Analog Devices Inc. LT8711EFE#PBF
- Part No.:
- LT8711EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8711EFE#PBF.pdf
- Description:
- IC REG CTRLR SYNC 20-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,595
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Product details
Overview
LT8711EFE#PBF 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 delivers precise input/output voltage regulation in automotive power systems, solar panel converters, and industrial supplies.
For engineers reviewing the LT8711EFE#PBF datasheet, LT8711EFE#PBF pinout, LT8711EFE#PBF application, or LT8711EFE#PBF equivalent, key selection considerations include topology selection via OPMODE pin, dual 2A gate drivers (TG/ BG), 0.8V FB reference accuracy, INTVCC/INTVEE LDO regulation behavior, and 100% duty cycle capability in buck mode.
Technical Context
The LT8711EFE#PBF implements constant-frequency current-mode PWM control with slope compensation to prevent subharmonic oscillation at high duty cycles. Its dual-regulator architecture powers gate drivers: INTVCC (5.0V LDO, VIN/EXTVCC-selectable) drives the BG NFET gate, while INTVEE (5.15V below BIAS) sets the TG PFET bottom rail.
Topology configuration is determined by OPMODE pin state: grounded for buck/ZETA, tied to INTVCC for boost/SEPIC, or connected to 100pF capacitor for nonsynchronous buck-boost. Regulation occurs via two independent loops-FB pin (0.8V reference) for output voltage control and EN/FBIN pin (1.200V reference) for input voltage regulation-both modulating peak commanded current through the VC error amplifier output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 42V; supports operation down to 0V when EXTVCC > 4.5V, enabling wide-source compatibility |
| Quiescent Current (Burst Mode) | 15µA typical; extends battery runtime in always-on systems without sacrificing light-load efficiency |
| Switching Frequency Range | 100kHz to 750kHz; adjustable via RT resistor or synchronizable to external clock for EMI control |
| FB Regulation Voltage | 0.795V to 0.816V (min/max); tight 0.8V reference enables ±1% output voltage accuracy with proper feedback divider |
| Gate Drive Capability | 2A sink/source on both TG and BG pins; supports fast switching of high-side PFET and low-side NFET with 11–14ns transition times |
| Duty Cycle Range | 0% to 100%; full-range control enables dropout operation in buck mode and flexible duty-cycle design across topologies |
| Current Sense Threshold | 46mV to 54mV (max CSP–CSN); sets peak current limit with temperature-stable sensing for reliable overcurrent protection |
Pinout & Package
LT8711EFE#PBF is housed in a 20-lead TSSOP package (FE) with exposed GND pad (Pin 21) requiring PCB soldering for thermal and electrical integrity. θJA = 38°C/W, TJMAX = 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/FBIN (1,19) | Enable & Input Voltage Regulation Input | Two-threshold control: ≥1.03V enables chip; ≥1.35V initiates soft-start and switching; 1.200V reference enables input voltage regulation |
| FB (2,20) | Output Voltage Feedback Input | Regulated to 0.8V reference; connects to resistor divider tap to set output voltage precisely |
| VC (3,1) | Error Amplifier Output | Drives external compensation network; voltage level determines commanded peak switch current |
| SS (4,2) | Soft-Start Timing Node | Charged by internal 410kΩ resistor to ~4.3V; external capacitor sets ramp rate for controlled current rise |
| OPMODE (5,3) | Topology Selection Control | GND = buck/ZETA; INTVCC = boost/SEPIC; 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 regulation in buck/boost modes |
| CSP/CSN (16,17 / 15,16) | Low-Side Current Sense Inputs | Kelvin-connected to sense resistor; sets peak current limit with max 54mV differential |
| TG (10,8) | PFET Gate Driver Output | 2A drive between INTVEE (low) and BIAS (high); non-overlap timing prevents shoot-through |
| BG (11,10) | NFET Gate Driver Output | 2A drive between GND (low) and INTVCC (high); complements TG for synchronous switching |
| INTVCC (13,12) | 5V Logic & BG Driver Supply | LDO regulated from VIN or EXTVCC; UVLO at 3.6V ensures safe BG operation before startup |
| INTVEE (8,6) | 5.15V Below BIAS for TG Driver | LDO referenced to BIAS; UVLO at 3.85V across BIAS–INTVEE enables TG only after stable rail establishment |
| VIN / EXTVCC (14,15 / 13,14) | Dual Input Power Supplies | Redundant inputs allow operation even if one rail collapses; logic selects optimal source for INTVCC |
| SYNC (19,17) | External Clock Synchronization | Logic-high forces FCM; logic-low enables DCM/Burst Mode; accepts 0.4V–1.3V logic levels |
| RT (20,18) | Oscillator Timing Resistor | Resistor to GND sets free-running frequency; 30.3kΩ → 675kHz, 247kΩ → 85kHz |
| GND (21,21) | Power & Signal Reference | Exposed pad must be soldered to PCB ground plane for thermal dissipation and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Topology Flexibility | Single IC supports five converter types via OPMODE pin configuration-reduces BOM count and design time across multiple power architectures |
| Ultra-Low Quiescent Current | 15µA in Burst Mode maintains >80% efficiency at 1mA load-critical for battery-powered telematics and remote sensors |
| Dual Independent Regulation Loops | Simultaneous FB-based output voltage and EN/FBIN-based input voltage regulation enable stable operation with weak or variable sources like solar panels |
| Robust Gate Drive Architecture | 2A TG/BG drivers with 70ns non-overlap timing and <15ns transitions support high-efficiency MOSFETs up to 100kHz–750kHz switching |
| Integrated Safety Protection | UVLO on INTVCC, INTVEE, and EN/FBIN; thermal shutdown at 165°C; automatic SS discharge on fault-ensures graceful failure in automotive environments |
Applications
| Automotive Infotainment Power Supply | Solar Panel MPPT Converter |
|---|---|
Use Scenario: Powers display, audio DSP, and connectivity modules from 9V–16V vehicle battery with transient tolerance up to 42V during load dump. IC Role / Device Role / Timing Role: Multitopology controller configured as synchronous buck-boost to maintain 5V/3.3V rails across wide input variation and cold-crank conditions. Use Value: 100% duty cycle capability sustains output during battery sag; 15µA quiescent current minimizes parasitic drain during vehicle sleep mode. | Use Scenario: Interfaces photovoltaic arrays (20–60V) to 12V battery storage with maximum power point tracking and input voltage regulation. IC Role / Device Role / Timing Role: Nonsynchronous buck-boost controller using EN/FBIN for input voltage regulation-maintaining optimal array operating point under partial shading. Use Value: Dual regulation loops enable simultaneous MPPT and battery charging control without external microcontroller intervention. |
| Industrial 24V Rail Converter | Programmable Lab Power Supply |
Use Scenario: Generates isolated 5V/12V outputs from unregulated 24V factory bus with high ripple rejection and thermal resilience. IC Role / Device Role / Timing Role: Synchronous SEPIC controller (OPMODE = INTVCC) providing non-inverting buck-boost conversion with inherent input-output isolation. Use Value: Wide 4.5V–42V input range accommodates brownouts and surges; 750kHz max frequency allows compact magnetics for space-constrained PLC modules. | Use Scenario: Adjustable 0–30V, 0–5A bench supply with digital voltage/current programming and analog feedback precision. IC Role / Device Role / Timing Role: Synchronous boost controller (OPMODE = INTVCC) delivering programmable output from 12V auxiliary rail with fast transient response. Use Value: 0.8V FB reference and 100kHz–750kHz frequency tuning enable <0.1% output accuracy and low-noise performance across full load range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multitopology controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3789EFE#PBF | Supports synchronous 4-switch buck-boost only; no SEPIC/ZETA; higher 3.5mA quiescent current; requires external VREF | Optimized for high-efficiency bidirectional power flow in USB PD and battery backup systems | Select when 4-switch architecture and reverse-current capability are required; not suitable for SEPIC/ZETA designs |
| LM5170QPWPRQ1 | Current-mode controller with integrated current-sense amplifiers; AEC-Q100 qualified; 2.5mA quiescent current; no Burst Mode | Designed specifically for automotive multi-phase current-sharing applications with enhanced diagnostics | Choose for ASIL-B automotive systems requiring built-in current monitoring and fault reporting |
Compared with LTC3789EFE#PBF and LM5170QPWPRQ1, the LT8711EFE#PBF offers broader topology support (including SEPIC/ZETA), lowest quiescent current (15µA), and integrated Burst Mode-making it ideal for cost-sensitive, battery-backed, or solar-harvesting applications where flexibility and ultra-low standby power are critical.
Availability
LT8711EFE#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, solar energy harvesters, and industrial 24V power supplies requiring stable component supply, extended temperature operation (–40°C to 125°C), and long-term lifecycle continuity.
Supply support for LT8711EFE#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 (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8711EFE#PBF belongs to ADI's Power by Linear™ multitopology controller family, engineered for high-efficiency, wide-input DC/DC conversion in harsh environments where reliability, low IQ, and topology versatility are essential.
FAQ
What topology configurations does the LT8711EFE#PBF support?
The LT8711EFE#PBF supports five distinct topologies: synchronous buck, boost, SEPIC, ZETA, and nonsynchronous buck-boost. Configuration is determined solely by the OPMODE pin connection-ground for buck/ZETA, INTVCC for boost/SEPIC, or 100pF capacitor to ground for buck-boost. This eliminates need for multiple controller variants in multi-rail designs.
How does the LT8711EFE#PBF achieve ultra-low quiescent current?
The LT8711EFE#PBF achieves 15µA typical quiescent current in Burst Mode by disabling all non-essential circuitry-including oscillator, gate drivers, and error amplifiers-between switching bursts. This occurs automatically when load current drops below threshold, maintaining low output ripple while maximizing battery life in always-on applications.
What is the function of the EN/FBIN pin on the LT8711EFE#PBF beyond chip enable?
On the LT8711EFE#PBF, the EN/FBIN pin serves dual functions: chip enable (≥1.03V) and input voltage regulation (1.200V reference). When used for regulation, a resistor divider from input voltage to EN/FBIN sets the desired input voltage point-enabling constant-power operation or preventing source collapse in high-impedance supplies like solar panels.
Can the LT8711EFE#PBF operate with input voltage below 4.5V?
Yes-the LT8711EFE#PBF can operate with VIN as low as 0V provided EXTVCC exceeds 4.5V, and conversely, EXTVCC can be 0V if VIN > 4.5V. The internal logic intelligently selects the optimal supply for INTVCC, ensuring continuous operation across wide input transients common in automotive and renewable energy systems.
What thermal protection features does the LT8711EFE#PBF include?
The LT8711EFE#PBF incorporates die temperature monitoring with automatic shutdown at 165°C. Upon overtemperature detection, the SS pin is rapidly discharged, both TG and BG drivers are disabled, and the part enters reset state. Recovery requires all reset conditions-including TJ < 160°C-to clear before soft-start resumes, preventing thermal runaway in enclosed enclosures.
LT8711EFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- 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
LT8711EFE#PBF FAQ
1.How can I place an order for LT8711EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8711EFE#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 LT8711EFE#PBF reliable?
The price and inventory of LT8711EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8711EFE#PBF is usually 5 days.
3.What payment methods are accepted for LT8711EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8711EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8711EFE#PBF?
LT8711EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8711EFE#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 LT8711EFE#PBF?
For technical support, including LT8711EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8711EFE#PBF requirements.
6.How does Aetrix verify that LT8711EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8711EFE#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 LT8711EFE#PBF meets industry standards.
7.What is the process for return or replacement of LT8711EFE#PBF?
All LT8711EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8711EFE#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 LT8711EFE#PBF part is unused and in its original packaging.
Return procedure for LT8711EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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