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Analog Devices Inc. LT8711EUDC#PBF
- Part No.:
- LT8711EUDC#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LT8711EUDC#PBF.pdf
- Description:
- IC REG CTRLR SYNC 20-QFN
- Quantity:
- Payment:
- Shipping:
Inventory:544
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Product details
Overview
LT8711EUDC#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, 100kHz–750kHz programmable switching frequency, and dual 2A gate drivers. It enables high-efficiency power conversion in automotive battery systems, solar panel interfaces, and industrial supplies where wide VIN and low IQ are critical.
For engineers reviewing the LT8711EUDC#PBF datasheet, LT8711EUDC#PBF pinout, LT8711EUDC#PBF application, or LT8711EUDC#PBF equivalent, key selection considerations include topology configuration via OPMODE pin, input voltage regulation using EN/FBIN, CSP/CSN current sensing accuracy (±4mV offset), INTVCC/INTVEE LDO UVLO thresholds, and QFN-20 thermal performance (θJA = 52°C/W).
Technical Context
The LT8711EUDC#PBF implements constant-frequency current-mode PWM control with slope compensation to prevent subharmonic oscillation at high duty cycles. Its dual-regulator architecture powers independent gate drivers: INTVCC (5.0V LDO, sourced from VIN or EXTVCC) drives the BG (NFET) output, while INTVEE (5.15V below BIAS) sets the TG (PFET) bottom rail.
Topology selection is hardware-defined by OPMODE pin state: grounded for buck/ZETA, tied to INTVCC for SEPIC/boost, or connected to 100pF capacitor for nonsynchronous buck-boost. Input voltage regulation is implemented via EN/FBIN feedback with 1.200V reference, enabling high-impedance source protection without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 42V; supports operation down to 0V VIN if EXTVCC > 4.5V, enabling cold-cranking automotive use. |
| Quiescent Current (Burst Mode) | 15µA typical; extends battery runtime in always-on systems like telematics or sensor nodes. |
| Switching Frequency Range | 100kHz to 750kHz; adjustable via RT resistor or synchronizable to external clock for EMI reduction. |
| Gate Drive Capability | 2A sink/source on both BG and TG outputs; supports fast-switching MOSFETs with <14ns rise/fall times. |
| FB Regulation Voltage | 795mV to 805mV; tight tolerance enables precise output voltage setting with minimal divider error. |
| Current Sense Threshold | 46mV to 54mV (CSP–CSN); low-voltage sensing minimizes power loss in high-current applications. |
| Operating Temperature Range | –40°C to +125°C junction; qualified for under-hood automotive and industrial environments. |
Pinout & Package
LT8711EUDC#PBF is housed in a 20-lead 3mm × 4mm plastic QFN package with exposed thermal pad (Pin 21 = GND), offering θJA = 52°C/W and θJC = 6.8°C/W for efficient heat dissipation in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/FBIN (1) | Enable & input voltage regulation input | Two-threshold control: ≥1.03V enables IC; ≥1.35V initiates soft-start and switching; 1.200V reference enables input voltage regulation loop. |
| FB (2) | Output voltage feedback input | Regulated to 0.800V reference; connects to resistor divider to set VOUT with ±1.5% accuracy over temperature. |
| VC (3) | Error amplifier output | Compensation node for FB and EN/FBIN loops; requires external RC network for stability across topologies. |
| SS (4) | Soft-start timing capacitor | Charged by internal 410kΩ resistor; controls ramp rate of peak current limit during startup to limit inrush. |
| OPMODE (5) | Topology selection control | GND = buck/ZETA; INTVCC = SEPIC/boost; 100pF-to-GND = nonsynchronous buck-boost. |
| ISP/ISN (6/7) | High-side current sense inputs | Kelvin-connected to sense resistor; used for input current limiting and DCM detection in boost/SEPIC modes. |
| INTVEE (6) | 5.15V-below-BIAS LDO output | Sets TG driver bottom rail; UVLO threshold is 3.85V (BIAS–INTVEE), enabling PFET switching only after regulation. |
| BIAS (7) | PFET gate driver top rail supply | Must be bypassed with ≥2.2µF to INTVEE; powers TG driver and sets upper voltage for PFET gate swing. |
| TG (8) | P-channel FET gate driver | 2A drive capability; output swings between INTVEE (low) and BIAS (high); non-overlap time ≥70ns prevents shoot-through. |
| BG (10) | N-channel FET gate driver | 2A drive capability; output swings between GND (low) and INTVCC (high); enabled only after INTVCC > 4.1V. |
| INTVCC (12) | 5.0V dual-input LDO output | Supplies BG driver and logic; sourced automatically from VIN or EXTVCC; UVLO = 3.6V ensures safe startup. |
| VIN (13) | Main input supply | Bypassed locally; operates down to 0V when EXTVCC > 4.5V, supporting backup power path designs. |
| EXTVCC (14) | Alternate input supply | Bypassed locally; operates down to 0V when VIN > 4.5V; enables seamless switchover in dual-rail systems. |
| CSP/CSN (15/16) | Input current sense inputs | Kelvin-connected to sense resistor; maximum differential = 54mV; used for input current limiting in all topologies. |
| SYNC (17) | External clock synchronization | Logic-high forces FCM; logic-low enables automatic DCM/Burst Mode; accepts 0.4V–1.3V logic levels. |
| RT (18) | Frequency programming resistor | Resistor to GND sets fSW: 30.3kΩ = ~675kHz, 247kΩ = ~100kHz; tolerance directly impacts switching frequency accuracy. |
| GND (21) | Power and signal ground | Exposed thermal pad must be soldered to PCB ground plane for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Topology flexibility via single-pin configuration | OPMODE pin selects buck/ZETA, SEPIC/boost, or nonsynchronous buck-boost without firmware or external logic. |
| Low-noise Burst Mode operation | Maintains <10mVpp output ripple at light loads while achieving 15µA IQ, ideal for battery-powered IoT sensors. |
| Dual independent LDO regulators | INTVCC (5.0V) and INTVEE (5.15V below BIAS) enable robust gate driving with separate UVLOs and thermal foldback. |
| Input voltage regulation with no external op-amp | EN/FBIN pin integrates 1.200V reference and error amplifier, allowing direct resistor-divider input regulation for high-impedance sources. |
| 100% duty cycle capability in buck mode | Enables dropout operation down to VIN ≈ VOUT + diode drop, critical for automotive start-stop and low-VIN industrial rails. |
Applications
| Automotive Battery Management | Solar Panel MPPT Interface |
|---|---|
Use Scenario: Regulating 9V–36V automotive battery to stable 12V for infotainment and ADAS modules during cold cranking and load dump. IC Role / Device Role / Timing Role: Multitopology controller configured as buck-boost to maintain regulation across wide input transients. Use Value: 4.5V–42V input range and 15µA Burst Mode IQ ensure continuous operation and extended standby time in vehicle-off states. | Use Scenario: Converting variable PV panel output (20V–60V) to fixed 48V bus for energy storage systems with partial shading resilience. IC Role / Device Role / Timing Role: SEPIC-mode controller with input voltage regulation to track MPP while maintaining stable output under dynamic irradiance. Use Value: EN/FBIN-based input regulation eliminates need for external MPPT controller, reducing BOM and complexity. |
| Industrial 24V Power Supply | Portable Medical Instrument Power |
Use Scenario: Generating isolated 5V/3.3V rails from unregulated 24V factory bus with high efficiency and low EMI. IC Role / Device Role / Timing Role: Synchronous buck controller with programmable 400kHz switching and SYNC input for spread-spectrum clocking. Use Value: 2A gate drivers support low-RDS(on) MOSFETs, achieving >94% efficiency at full load while meeting CISPR-22 Class B limits. | Use Scenario: Powering handheld ultrasound or glucose monitors from single Li-ion cell (2.7V–4.2V) to 3.3V/5V system rails. IC Role / Device Role / Timing Role: Boost converter with 100% duty cycle support and ultra-low IQ to maximize battery life in sleep mode. Use Value: 15µA Burst Mode IQ extends device runtime beyond 72 hours on a single charge, meeting IEC 62304 safety requirements. |
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#PBF | Supports up to 60V input; includes integrated MOSFET drivers but lacks nonsynchronous buck-boost mode; higher IQ (25µA) in Burst Mode. | Preferred for higher-input industrial systems requiring >42V rating; not suitable for cost-sensitive buck-boost-only designs. | Select LTC3789EFE#PBF when input exceeds 42V or when integrated drivers simplify layout; verify topology compatibility. |
| LM5170QPWPRQ1 | Automotive-qualified dual-channel current controller; supports bidirectional operation; no built-in OPMODE pin - requires external logic for topology change. | Required for ASIL-B automotive traction inverters or battery testing equipment needing reverse current capability. | Choose LM5170QPWPRQ1 only for AEC-Q100 Grade 1 automotive applications demanding bidirectional control and fault reporting. |
Compared with LTC3789EFE#PBF and LM5170QPWPRQ1, the LT8711EUDC#PBF offers unique single-pin topology selection, lowest Burst Mode IQ (15µA), and native nonsynchronous buck-boost support - making it optimal for space-constrained, battery-sensitive, multi-rail industrial and automotive subsystems.
Availability
LT8711EUDC#PBF is available at Aetrix Electronics and suitable for automotive battery management, solar MPPT interfaces, and industrial 24V power supplies requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for LT8711EUDC#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and power management markets.
The LT8711 product line delivers highly flexible, low-quiescent-current DC/DC controllers for automotive, industrial, and renewable energy applications where wide input range, topology agility, and thermal robustness are essential.
FAQ
What topology configurations does the LT8711EUDC#PBF support, and how is selection implemented?
The LT8711EUDC#PBF supports synchronous buck, boost, SEPIC, ZETA, and nonsynchronous buck-boost topologies. Selection is implemented solely through the OPMODE pin: grounding it configures buck/ZETA mode; connecting it to INTVCC selects SEPIC/boost; and tying it to a 100pF capacitor to GND enables nonsynchronous buck-boost. This hardware-based method eliminates firmware dependencies and ensures deterministic startup behavior in the LT8711EUDC#PBF.
How does the LT8711EUDC#PBF achieve ultra-low quiescent current, and what is its impact on battery-powered systems?
The LT8711EUDC#PBF achieves 15µA typical quiescent current in Burst Mode by shutting down switching and most internal circuitry between bursts, retaining only essential bias currents. This enables multi-day standby in battery-powered systems such as telematics or remote sensors. The LT8711EUDC#PBF maintains low output ripple (<10mVpp) during Burst Mode, avoiding audible noise or interference in sensitive analog circuits.
What are the key differences between the LT8711EUDC#PBF and the TSSOP-packaged LT8711EFE#PBF?
The LT8711EUDC#PBF uses a 3mm × 4mm QFN package with θJA = 52°C/W and exposed thermal pad, while the LT8711EFE#PBF uses a 20-lead TSSOP with θJA = 38°C/W. Both share identical electrical specifications and operating temperature range (–40°C to +125°C). The LT8711EUDC#PBF offers superior thermal performance per unit area and smaller footprint, making it preferred for space-constrained PCBs where thermal density is critical.
Can the LT8711EUDC#PBF regulate input voltage, and how is this function implemented?
Yes, the LT8711EUDC#PBF regulates input voltage using the EN/FBIN pin, which contains an internal 1.200V reference and error amplifier. A resistor divider from VIN to EN/FBIN sets the regulation point, enabling the controller to limit input current and prevent collapse of high-impedance sources like solar panels or long cables. This function operates independently of output regulation and is fully integrated - no external op-amp or comparator is required in the LT8711EUDC#PBF design.
What gate driver specifications does the LT8711EUDC#PBF provide, and how do they affect MOSFET selection?
The LT8711EUDC#PBF provides dual 2A gate drivers: BG (NFET) swings from GND to INTVCC (5.0V), and TG (PFET) swings from INTVEE (5.15V below BIAS) to BIAS. Rise/fall times are ≤14ns into 3.3nF loads, and non-overlap time exceeds 70ns. These specs allow direct drive of MOSFETs with Qg ≤ 30nC at 500kHz, eliminating need for external drivers and reducing layout complexity in the LT8711EUDC#PBF application.
LT8711EUDC#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN 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-QFN (3x4)
LT8711EUDC#PBF FAQ
1.How can I place an order for LT8711EUDC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8711EUDC#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 LT8711EUDC#PBF reliable?
The price and inventory of LT8711EUDC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8711EUDC#PBF is usually 5 days.
3.What payment methods are accepted for LT8711EUDC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8711EUDC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8711EUDC#PBF?
LT8711EUDC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8711EUDC#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 LT8711EUDC#PBF?
For technical support, including LT8711EUDC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8711EUDC#PBF requirements.
6.How does Aetrix verify that LT8711EUDC#PBF is sourced from the original manufacturer or authorized distributors?
All LT8711EUDC#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 LT8711EUDC#PBF meets industry standards.
7.What is the process for return or replacement of LT8711EUDC#PBF?
All LT8711EUDC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8711EUDC#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 LT8711EUDC#PBF part is unused and in its original packaging.
Return procedure for LT8711EUDC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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