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Analog Devices Inc. LT8711EFE#TRPBF
- Part No.:
- LT8711EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8711EFE#TRPBF.pdf
- Description:
- IC REG CTRLR SYNC 20 TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,255
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Product details
Overview
LT8711EFE#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 delivers precise input/output voltage regulation in automotive power supplies, solar panel converters, and industrial DC/DC systems.
For engineers reviewing the LT8711EFE#TRPBF datasheet, LT8711EFE#TRPBF pinout, LT8711EFE#TRPBF application, or LT8711EFE#TRPBF equivalent, key selection considerations include topology flexibility via OPMODE pin, dual 2A gate drivers (TG/ BG), 100% duty cycle capability in buck mode, and low-noise Burst Mode operation for battery-backed systems.
Technical Context
The LT8711EFE#TRPBF implements constant-frequency current-mode PWM control with integrated slope compensation to prevent subharmonic oscillation at high duty cycles. Its dual-regulator architecture supplies INTVCC (5.0V LDO) for NFET gate drive and INTVEE (BIAS – 5.15V) for PFET gate drive, enabling independent rail optimization.
Topology selection is hardware-configured via OPMODE pin: grounded for buck/ZETA, tied to INTVCC for SEPIC/boost, or connected to 100pF capacitor for nonsynchronous buck-boost. Input voltage regulation is implemented through EN/FBIN pin with 1.200V reference, while output regulation uses FB pin referenced to 0.800V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 42V; supports VIN = 0V when EXTVCC > 4.5V for flexible supply routing |
| Quiescent Current (Burst Mode) | 15µA typical; extends runtime in battery-powered systems with minimal light-load loss |
| Switching Frequency Range | 100kHz to 750kHz; set by RT resistor or synchronized externally via SYNC pin |
| Gate Drive Capability | 2A sink/source on both TG (PFET) and BG (NFET); enables fast switching of high-current MOSFETs |
| FB Regulation Voltage | 0.800V ±16mV; provides stable output voltage feedback with low drift over temperature |
| Current Sense Threshold | 50mV max CSP–CSN; sets peak current limit with 46–54mV typical range for accurate overload protection |
| Operating Junction Temp | –40°C to +125°C; qualified for under-hood automotive and industrial environments |
Pinout & Package
LT8711EFE#TRPBF 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 ensures robust thermal performance in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/FBIN (1,19) | Enable & Input Voltage Regulation Input | Enables chip above 1.03V; activates soft-start above 1.35V; regulates input current at 1.200V reference |
| FB (2,20) | Output Voltage Feedback Input | Regulated to 0.800V; connects to resistor divider for precise VOUT setting |
| VC (3,1) | Error Amplifier Output | Compensation node for stability tuning; drives external RC network |
| SS (4,2) | Soft-Start Control | Charged by internal 410kΩ resistor; external capacitor controls ramp rate of peak current |
| OPMODE (5,3) | Topology Selection | 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 for accurate input current limiting |
| CSP/CSN (16,17 / 15,16) | Low-Side Current Sense Inputs | Kelvin-connected to sense resistor for peak current control and overload protection |
| 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 operation |
| INTVCC (13,12) | 5V LDO Regulator Output | Powers BG driver and logic; sourced from VIN or EXTVCC; UVLO at 3.6V |
| INTVEE (8,6) | BIAS–5.15V LDO Output | Sets TG bottom rail; enables PFET switching only after BIAS–INTVEE > 3.85V |
| SYNC (19,17) | External Clock Input | Drives FCM mode when high; reverts to free-running oscillator when <0.4V |
| RT (20,18) | Oscillator Timing Resistor | Resistor to GND sets fOSC from 100kHz to 750kHz; tolerance affects frequency accuracy |
| GND (21,21) | Power Ground | Exposed pad must be soldered to PCB ground plane for thermal dissipation and noise control |
Key Features
| Feature | Design Value |
|---|---|
| Topology Flexibility | Single IC supports five converter types via OPMODE pin configuration-reduces BOM count and design time |
| Ultra-Low Quiescent Current | 15µA in Burst Mode maintains >80% efficiency at 1mA load-critical for always-on automotive modules |
| Dual Independent Gate Drivers | 2A TG and BG outputs with 100ns non-overlap timing enable efficient synchronous rectification without external drivers |
| Input & Output Regulation | Simultaneous EN/FBIN-based input voltage regulation and FB-based output regulation support source-limited applications like solar MPPT |
| Robust Protection Architecture | UVLO on INTVCC, INTVEE, and VIN/EXTVCC plus overtemperature shutdown (165°C) ensure reliable startup and fault recovery |
Applications
| Automotive Power Supply | Solar Panel Power Converter |
|---|---|
Use Scenario: 12V/24V vehicle battery powering infotainment, ADAS sensors, or telematics modules across cold-crank (4.5V) to load-dump (42V) transients. IC Role / Device Role / Timing Role: Multitopology controller regulating stable 5V/3.3V rails from wide-input automotive supply; operates in buck mode during normal conditions and boosts during cold-crank. Use Value: 100% duty cycle capability maintains output during battery sag; 15µA quiescent current prevents battery drain during vehicle sleep mode. | Use Scenario: Converting variable PV panel output (20–60V) to regulated 48V bus for energy storage or grid-tie inverters. IC Role / Device Role / Timing Role: SEPIC or boost controller implementing MPPT algorithm via EN/FBIN input voltage regulation loop. Use Value: Input regulation feature allows direct connection of EN/FBIN to panel voltage-enabling real-time peak power tracking without external ADC or MCU intervention. |
| Industrial DC/DC Conversion | High-Voltage Industrial Supply |
Use Scenario: Isolated or non-isolated 24V-to-5V/12V conversion in PLC I/O modules, motor drives, or process controllers with strict EMI and efficiency requirements. IC Role / Device Role / Timing Role: Synchronous buck controller operating at 400kHz to minimize filter size while maintaining >92% efficiency at full load. Use Value: Adjustable soft-start (via SS pin) eliminates inrush current; programmable frequency avoids sensitive frequency bands in noisy factory environments. | Use Scenario: Powering industrial sensors or actuators from 36–42V DC distribution buses in factory automation or railway systems. IC Role / Device Role / Timing Role: Nonsynchronous buck-boost controller configured via OPMODE pin to regulate 12V output even when input drops below 12V (e.g., brownout). Use Value: Seamless transition between buck and boost modes ensures uninterrupted operation during input voltage dips-no system reset required. |
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 | Wider 4V–60V input range; includes integrated MOSFET drivers but no nonsynchronous buck-boost mode | Preferred for higher-voltage solar or telecom applications where >42V input is required | Select LTC3789EFE#TRPBF when input exceeds 42V or when integrated drivers simplify layout |
| LT8390EFE#TRPBF | 4V–60V input; synchronous 4-switch buck-boost only (no SEPIC/boost/buck); higher 100V MOSFET gate drive | Optimized for single-stage bidirectional conversion in battery management systems | Choose LT8390EFE#TRPBF for pure buck-boost applications needing 100V gate drive and lower component count |
Compared with LTC3789EFE#TRPBF and LT8390EFE#TRPBF, LT8711EFE#TRPBF uniquely supports five topologies-including nonsynchronous buck-boost-within a 4.5V–42V range and delivers lowest quiescent current (15µA), making it optimal for input-limited, multi-mode industrial and automotive designs.
Availability
LT8711EFE#TRPBF is available at Aetrix Electronics and suitable for automotive power supplies, solar panel converters, and industrial DC/DC systems requiring stable component supply, extended temperature operation, and long-term lifecycle continuity.
Supply support for LT8711EFE#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 industrial, automotive, communications, and healthcare markets.
The LT8711 product line delivers highly flexible, low-quiescent-current DC/DC controllers targeting wide-input, multi-topology power conversion in harsh environments-designed for reliability under voltage transients, thermal stress, and long operational life.
FAQ
What topology configurations does the LT8711EFE#TRPBF support?
The LT8711EFE#TRPBF supports five distinct topologies: synchronous buck, boost, SEPIC, ZETA, and nonsynchronous buck-boost. Configuration is achieved by connecting the OPMODE pin to GND (buck/ZETA), INTVCC (SEPIC/boost), or a 100pF capacitor to GND (nonsynchronous buck-boost). This flexibility allows one part number to replace multiple dedicated controllers in diverse power architectures, reducing design complexity and inventory overhead for the LT8711EFE#TRPBF.
How does the LT8711EFE#TRPBF achieve ultra-low quiescent current in battery-powered systems?
The LT8711EFE#TRPBF achieves 15µA typical quiescent current in Burst Mode operation by disabling nonessential circuitry-including gate drivers and oscillator-between switching bursts while maintaining regulation via periodic sampling. This behavior is automatic and requires no external control; it activates when FB voltage rises above regulation threshold due to light load. The LT8711EFE#TRPBF's low IQ directly extends battery runtime in always-on automotive modules and portable industrial equipment.
What is the function of the EN/FBIN pin on the LT8711EFE#TRPBF beyond enabling the device?
On the LT8711EFE#TRPBF, the EN/FBIN pin serves dual roles: chip enable (active above 1.03V) and input voltage regulation input (reference = 1.200V). When used for regulation, a resistor divider from VIN to EN/FBIN sets the input voltage threshold-causing the controller to reduce commanded peak current if input sags, thereby preventing collapse of weak sources like photovoltaic panels or aging batteries. This feature is integral to MPPT implementations and is fully supported in all topologies of the LT8711EFE#TRPBF.
Can the LT8711EFE#TRPBF operate with input voltage below 4.5V?
Yes-the LT8711EFE#TRPBF can operate with VIN as low as 0V provided EXTVCC exceeds 4.5V, and conversely, EXTVCC can be 0V if VIN > 4.5V. This dual-supply capability allows operation during cold-crank events (e.g., automotive battery at 3.5V) by powering the controller from an auxiliary rail. However, full functionality-including gate drive-requires both INTVCC > 4.1V and BIAS–INTVEE > 3.85V, which are enforced by internal UVLO thresholds in the LT8711EFE#TRPBF.
What are the thermal requirements for the LT8711EFE#TRPBF in a 20-lead TSSOP package?
The LT8711EFE#TRPBF in FE (20-lead TSSOP) package has θJA = 38°C/W and maximum junction temperature of 125°C. To maintain safe operation, the exposed GND pad (Pin 21) must be soldered to a minimum 200mm² copper area on the PCB with ≥4 thermal vias. Under 2A gate drive loads at 750kHz, board-level thermal design must limit ambient temperature to ≤85°C to avoid derating. These thermal constraints are validated per the LT8711EFE#TRPBF datasheet and apply across its full –40°C to +125°C operating range.
LT8711EFE#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
LT8711EFE#TRPBF FAQ
1.How can I place an order for LT8711EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8711EFE#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 LT8711EFE#TRPBF reliable?
The price and inventory of LT8711EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8711EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8711EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8711EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8711EFE#TRPBF?
LT8711EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8711EFE#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 LT8711EFE#TRPBF?
For technical support, including LT8711EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8711EFE#TRPBF requirements.
6.How does Aetrix verify that LT8711EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8711EFE#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 LT8711EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8711EFE#TRPBF?
All LT8711EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8711EFE#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 LT8711EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8711EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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