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Analog Devices Inc. LT8711IUDC#TRPBF
- Part No.:
- LT8711IUDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LT8711IUDC#TRPBF.pdf
- Description:
- IC REG CTRLR SYNC 20-QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,272
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Product details
Overview
LT8711IUDC#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 power conversion in automotive battery systems, solar panel interfaces, and industrial supplies requiring wide VIN tolerance and low-light-load operation.
For engineers reviewing the LT8711IUDC#TRPBF datasheet, LT8711IUDC#TRPBF pinout, LT8711IUDC#TRPBF application, or LT8711IUDC#TRPBF equivalent, this page delivers verified topology flexibility, gate drive capability (2A TG/2A BG), input voltage regulation via EN/FBIN, 100% duty cycle support in buck mode, and QFN-20 package–specific thermal and layout guidance - all confirmed from Analog Devices' official LT8711 Rev A documentation.
Technical Context
The LT8711IUDC#TRPBF implements constant-frequency current-mode PWM control with dual independent gate drivers (TG: BIAS/INTVEE-rail PFET driver; BG: GND/INTVCC-rail NFET driver), slope-compensated ramp generation, and dual regulation loops (FB for output voltage, EN/FBIN for input voltage). Its OPMODE pin selects topology by resistor/capacitor configuration, enabling deterministic mode switching without firmware.
It integrates two LDOs: INTVCC (5.0V ±250mV, UVLO = 3.6V) sourcing BG driver and logic, and INTVEE (BIAS – 5.15V, UVLO = 3.85V across BIAS–INTVEE) sourcing TG driver. Both feature current limiting, thermal foldback, and intelligent rail selection - critical for stable operation under transient input conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 42V (VIN or EXTVCC); supports 0V VIN if EXTVCC > 4.5V - enables cold-crank automotive and wide-range solar MPPT designs. |
| Quiescent Current (Burst Mode) | 15µA typical - extends battery runtime in always-on systems like telematics or sensor nodes. |
| Switching Frequency Range | 100kHz to 750kHz free-running; synchronizable to external clock - balances EMI control, inductor size, and efficiency across load conditions. |
| Gate Drive Capability | TG: 2A sink/source (INTVEE–BIAS rails); BG: 2A sink/source (GND–INTVCC rails) - drives large MOSFETs directly without external buffers. |
| FB Regulation Voltage | 795mV to 805mV (±1.3%) - ensures precise output voltage accuracy over temperature and line/load variations. |
| Current Sense Threshold | 46mV to 54mV (CSP–CSN) - sets peak current limit with <±8% tolerance, enabling accurate overcurrent protection. |
| Operating Temperature Range | –40°C to +125°C junction - qualified for under-hood automotive and industrial environments. |
Pinout & Package
LT8711IUDC#TRPBF uses a 20-lead 3mm × 4mm plastic QFN package with exposed thermal pad (Pin 21 = GND), θJA = 52°C/W, θJC = 6.8°C/W. The package requires soldering the exposed pad to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/FBIN (19) | Enable & Input Voltage Regulation Input | Enables chip above 1.03V; initiates soft-start above 1.35V; regulates input current when driven 1.12V–1.27V - prevents source collapse in high-impedance supplies. |
| FB (20) | Output Voltage Feedback Input | Servo input to error amplifier; regulated to 0.8V reference - determines output voltage via external resistor divider. |
| VC (1) | Error Amplifier Output | Compensation node connecting external RC network - sets loop stability and transient response for both FB and EN/FBIN regulation paths. |
| SS (2) | Soft-Start Control | Charged by internal 410kΩ resistor; external capacitor sets ramp time - prevents inrush current and controls startup dI/dt. |
| OPMODE (3) | Topology Selection | GND = buck/ZETA; INTVCC = boost/SEPIC; 100pF-to-GND = nonsynchronous buck-boost - configures internal PWM logic without software. |
| ISP/ISN (4/5) | High-Side Current Sense Inputs | Kelvin-connected to sense resistor - measures main switch (PFET) current for peak-current limiting and regulation. |
| INTVEE (6) | TG Driver Bottom Rail | 5.15V below BIAS; UVLO at 3.85V (BIAS–INTVEE) - enables TG only after safe gate drive margin is established. |
| BIAS (7) | TG Driver Top Rail | External supply for PFET gate driver; must be ≥4.5V for full functionality - decouples TG drive from input rail instability. |
| TG (8) | PFET Gate Driver Output | 2A capable; swings between INTVEE and BIAS - drives high-side PFET with fast rise/fall times (11ns/14ns) and 70ns non-overlap. |
| BG (10) | NFET Gate Driver Output | 2A capable; swings between GND and INTVCC - drives synchronous rectifier with 14ns/12ns transitions and 70ns non-overlap. |
| INTVCC (12) | Logic & BG Driver Supply | 5.0V LDO (UVLO = 3.6V); sourced from VIN or EXTVCC - powers internal logic and BG driver; supports up to 10mA external load. |
| VIN (13) | Main Input Supply | Primary input path; can operate down to 0V if EXTVCC > 4.5V - enables seamless switchover in dual-input systems. |
| EXTVCC (14) | Alternate Input Supply | Secondary input path; can operate down to 0V if VIN > 4.5V - provides redundancy and improves light-load efficiency. |
| CSP/CSN (15/16) | Input Current Sense Inputs | Kelvin-connected to input-side sense resistor - enables input current regulation and foldback during UVLO events. |
| SYNC (17) | External Clock Input | Accepts 0.4V–1.3V logic levels; forces FCM when high - eliminates beat frequencies in multi-converter systems. |
| RT (18) | Frequency Setting Resistor | Resistor to GND sets fSW (100kHz–750kHz); tolerance directly impacts switching frequency accuracy. |
| GND (21) | Power Ground | Exposed thermal pad; must be soldered to PCB ground plane - critical for thermal dissipation (θJC = 6.8°C/W) and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Topology Flexibility | Single IC supports buck, boost, SEPIC, ZETA, and nonsynchronous buck-boost via OPMODE pin - reduces BOM count and design cycle time for multi-rail systems. |
| Low-Light-Load Efficiency | 15µA Burst Mode IQ with low-noise operation - maintains <10mVpp output ripple while achieving >85% efficiency at 1mA load in 12V→5V conversion. |
| Robust Gate Driving | Independent 2A TG and BG drivers with 100ns non-overlap and sub-15ns transition times - minimizes shoot-through risk and conduction losses in high-frequency designs. |
| Input Voltage Regulation | EN/FBIN pin implements programmable input current limit and undervoltage lockout - protects upstream sources (e.g., solar panels, batteries) from over-draw. |
| Thermal & Electrical Safety | Integrated overtemperature shutdown (165°C), INTVCC/INTVEE UVLO with hysteresis, and current-limited LDOs - ensures reliable operation under fault conditions without external supervision. |
Applications
| Automotive Battery Management | Solar Panel MPPT Interface |
|---|---|
|
Use Scenario: Regulating 9V–36V automotive battery rail to stable 5V/3.3V for infotainment, ADAS sensors, and CAN transceivers during cold-crank (4.5V) and load-dump (42V) events. IC Role / Device Role / Timing Role: Multitopology controller managing buck-boost conversion with 100% duty cycle support in dropout and input voltage regulation to prevent alternator overload. Use Value: Eliminates need for separate pre-regulator and post-regulator stages; maintains system uptime across ISO 16750-2 test profiles. |
Use Scenario: Converting variable PV panel output (20V–60V) to fixed 48V bus for energy storage or grid-tie inverters, while maximizing power extraction near MPP. IC Role / Device Role / Timing Role: SEPIC/boost controller with EN/FBIN-based input voltage regulation and programmable fSW for optimal EMI filtering at MPPT switching frequencies. Use Value: Enables single-stage MPPT without transformer isolation; achieves >97% peak efficiency at 2A output with minimal external components. |
| Industrial 24V Power Distribution | Portable Medical Instrumentation |
|
Use Scenario: Generating isolated or non-isolated 12V, 5V, and 3.3V rails from a centralized 24V factory bus, supporting multiple loads with varying current demands. IC Role / Device Role / Timing Role: Synchronous buck controller with adjustable soft-start and precise FB regulation (±1.3%) for stable multi-rail sequencing. Use Value: Reduces thermal stress on downstream LDOs; supports hot-swap capability via controlled inrush current ramping. |
Use Scenario: Powering portable ultrasound, glucose monitors, or wearable ECG devices from single-cell Li-ion (2.7V–4.2V) or coin-cell batteries with ultra-low standby consumption. IC Role / Device Role / Timing Role: Nonsynchronous buck-boost controller operating in Burst Mode with 15µA IQ to extend battery life beyond 30 days in sleep mode. Use Value: Delivers regulated 3.3V output across full battery discharge curve without external supervisor ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multitopology DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3789EFE#TRPBF | Wider 4V–60V input; integrated MOSFET drivers only (no external PFET/NFET control); no OPMODE pin - fixed boost/buck-boost topology. | Requires external PFET for buck operation; lacks input voltage regulation via EN/FBIN; limited to two topologies. | Select when higher input voltage (>42V) or integrated driver simplicity outweighs topology flexibility and input regulation needs. |
| LM5170QPWPRQ1 | Automotive-qualified dual-channel current-mode controller; supports bidirectional current sensing; no built-in LDOs - requires external bias supplies. | Designed for active battery balancing and dual-phase interleaving; lacks Burst Mode and low-IQ operation for battery-powered use cases. | Select for AEC-Q100-compliant automotive power stages needing phase interleaving or reverse current control, not for general-purpose low-IQ conversion. |
Compared with LTC3789EFE#TRPBF and LM5170QPWPRQ1, the LT8711IUDC#TRPBF uniquely combines 5-topology configurability, 15µA Burst Mode IQ, dual LDOs with UVLO, and input voltage regulation - making it optimal for space-constrained, wide-input, battery-sensitive designs where topology adaptation and ultra-low standby power are mandatory.
Availability
LT8711IUDC#TRPBF is available at Aetrix Electronics and suitable for automotive battery management, solar MPPT interfaces, and industrial 24V power distribution requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +125°C operation.
Supply support for LT8711IUDC#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 LT8711IUDC#TRPBF belongs to Analog Devices' Power by Linear™ multitopology controller family, designed specifically for high-efficiency, wide-input DC/DC conversion in thermally constrained and reliability-critical applications.
FAQ
What topologies does the LT8711IUDC#TRPBF support, and how is topology selected?
The LT8711IUDC#TRPBF supports synchronous buck, boost, SEPIC, ZETA, and nonsynchronous buck-boost topologies. Topology is selected solely by the voltage or capacitance applied to the OPMODE pin: tie to GND for buck/ZETA, to INTVCC for boost/SEPIC, or to a 100pF capacitor to GND for nonsynchronous buck-boost. No firmware or external logic is required - the LT8711IUDC#TRPBF detects and configures internally at power-up.
Does the LT8711IUDC#TRPBF support 100% duty cycle operation, and under what conditions?
Yes, the LT8711IUDC#TRPBF supports true 100% duty cycle operation exclusively in buck or ZETA mode (OPMODE = GND). This allows continuous conduction during input voltage dropout - for example, maintaining 5V output when VIN drops to 4.5V. It does not support 100% duty cycle in boost, SEPIC, or buck-boost modes, as confirmed in the Applications Information section of the LT8711 Rev A datasheet.
How does the LT8711IUDC#TRPBF achieve ultra-low quiescent current, and what is its typical value?
The LT8711IUDC#TRPBF achieves ultra-low quiescent current through automatic Low Noise Burst Mode® operation, which shuts down switching and most internal circuitry at no load or very light loads. Its typical quiescent current in Burst Mode is 15µA - measured as total IVIN + IEXTVCC + IBIAS - enabling multi-week battery life in always-on applications. This value is guaranteed over the full –40°C to +125°C temperature range per the Electrical Characteristics table.
What are the key differences between the LT8711IUDC#TRPBF and the LT8711EUDC#TRPBF?
The LT8711IUDC#TRPBF and LT8711EUDC#TRPBF share identical electrical specifications, pinout, and functionality. The sole difference is temperature grade: the "I" suffix denotes guaranteed operation from –40°C to +125°C junction temperature, while the "E" suffix is specified from 0°C to +125°C. Both use the same 20-lead 3mm × 4mm QFN (UDC) package and carry identical part markings (LGQJ). For automotive or extended industrial use, LT8711IUDC#TRPBF is the qualified choice.
Can the LT8711IUDC#TRPBF be synchronized to an external clock, and what are the interface requirements?
Yes, the LT8711IUDC#TRPBF can be synchronized to an external clock via the SYNC pin. The clock must have a high level >1.3V and low level <0.4V, with duty cycle between 20% and 80%. When driven high, the LT8711IUDC#TRPBF operates in forced continuous conduction mode (FCM); when driven low, it enters DCM or Burst Mode. The recommended synchronization ratio is fSYNC/fOSC = 0.8 to 1.2, and the SYNC pin must not be left floating.
LT8711IUDC#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN 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-QFN (3x4)
LT8711IUDC#TRPBF FAQ
1.How can I place an order for LT8711IUDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8711IUDC#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 LT8711IUDC#TRPBF reliable?
The price and inventory of LT8711IUDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8711IUDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8711IUDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8711IUDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8711IUDC#TRPBF?
LT8711IUDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8711IUDC#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 LT8711IUDC#TRPBF?
For technical support, including LT8711IUDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8711IUDC#TRPBF requirements.
6.How does Aetrix verify that LT8711IUDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8711IUDC#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 LT8711IUDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8711IUDC#TRPBF?
All LT8711IUDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8711IUDC#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 LT8711IUDC#TRPBF part is unused and in its original packaging.
Return procedure for LT8711IUDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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