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Analog Devices Inc. LT8711IUDC#PBF
- Part No.:
- LT8711IUDC#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LT8711IUDC#PBF.pdf
- Description:
- IC REG CTRLR SYNC 20-QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,779
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Product details
Overview
LT8711IUDC#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 enables high-efficiency power conversion in automotive battery systems, solar panel interfaces, and industrial supplies requiring wide VIN tolerance and topology flexibility.
For engineers reviewing the LT8711IUDC#PBF datasheet, LT8711IUDC#PBF pinout, LT8711IUDC#PBF application, or LT8711IUDC#PBF equivalent, key selection considerations include its dual gate drive capability (2A TG/2A BG), 100% duty cycle support in buck mode, OPMODE-pin-configurable topology, and integrated INTVCC/INTVEE LDOs for robust gate driver biasing across temperature.
Technical Context
The LT8711IUDC#PBF implements constant-frequency current-mode PWM control with slope compensation to prevent subharmonic oscillation at high duty cycles. Its dual regulation loops-output voltage via FB (0.800V reference) and input voltage via EN/FBIN (1.200V reference)-jointly command peak switch current through the VC error amplifier node.
Topology selection is hardware-defined by 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. Gate drivers feature non-overlap timing (~70ns) and fast transitions (TG rise: 11ns, BG fall: 12ns) to minimize shoot-through risk while enabling efficient synchronous FET control.
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 - enables cold-cranking and wide-range solar/battery inputs |
| Quiescent Current (Burst Mode) | 15µA typical - extends runtime in always-on automotive and IoT edge devices |
| Switching Frequency Range | 100kHz to 750kHz, adjustable via RT resistor or external SYNC clock - balances EMI, efficiency, and magnetics size |
| Gate Drive Capability | 2A sink/source for both TG (BIAS–INTVEE rail) and BG (GND–INTVCC rail) - drives large MOSFETs with low RDS(on) without external buffers |
| FB Regulation Voltage | 0.795V to 0.816V (min/max over temp) - ensures tight output voltage accuracy across –40°C to 125°C junction range |
| Current Sense Threshold | 46mV to 54mV (max CSP–CSN) - sets precise overcurrent protection with minimal sense resistor loss |
| Operating Temperature | –40°C to +125°C junction - qualified for under-hood automotive and industrial environments |
Pinout & Package
LT8711IUDC#PBF is housed in a 20-lead 3mm × 4mm QFN package with exposed thermal pad (Pin 21 = GND). The package supports high-power density layouts and enhanced thermal dissipation (θJC = 6.8°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/FBIN (19) | Enable & Input Voltage Regulation | Enables chip above 1.03V; triggers soft-start above 1.35V; regulates input current when biased between 1.12V–1.27V |
| FB (20) | Output Voltage Feedback | Serves as inverting input to error amp; regulated to 0.800V reference for stable VOUT control |
| VC (1) | Error Amplifier Output | Integrates feedback and regulation signals; connects to external compensation network for loop stability |
| SS (2) | Soft-Start Control | Charged by internal 410kΩ resistor; external capacitor sets ramp rate for controlled current limit startup |
| OPMODE (3) | Topology Selection | GND = buck/ZETA; INTVCC = SEPIC/boost; 100pF-to-GND = nonsynchronous buck-boost |
| ISP/ISN (4/5) | High-Side Current Sense Inputs | Kelvin-connected to sense resistor; used for input current limiting and regulation in buck/SEPIC modes |
| CSP/CSN (15/16) | Low-Side Current Sense Inputs | Kelvin-connected to sense resistor; provides primary current limiting path in boost/buck-boost modes |
| TG (8) | PFET Gate Driver Output | Drives high-side PFET with rail-to-rail swing between INTVEE and BIAS; 2A drive strength |
| BG (10) | NFET Gate Driver Output | Drives low-side NFET with rail-to-rail swing between GND and INTVCC; 2A drive strength |
| INTVCC (12) | 5V Logic & BG Bias Rail | Dual-input LDO (VIN/EXTVCC); powers logic and BG driver; UVLO at 3.6V ensures safe startup |
| INTVEE (6) | 5V Below BIAS for TG Bias | LDO referenced to BIAS; sets TG bottom rail; UVLO at 3.85V (BIAS–INTVEE) prevents premature PFET switching |
| VIN (13) / EXTVCC (14) | Primary & Alternate Power Inputs | Redundant supply inputs; chip selects optimal source for INTVCC; enables operation with either rail active |
| SYNC (17) | External Clock Synchronization | Accepts 0.4V–1.3V logic levels; forces FCM when high; enables DCM/Burst Mode when low |
| RT (18) | Frequency Setting Resistor | Resistor to GND sets free-running fSW; 30.3kΩ = ~675kHz, 247kΩ = ~100kHz |
| GND (21) | Power & Signal Ground | 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 design reuse across multiple power architectures |
| Ultra-Low Quiescent Current | 15µA in Burst Mode - meets automotive ISO 16750-2 sleep-mode requirements and extends battery life in portable systems |
| Integrated Dual LDOs | INTVCC (5.0V) and INTVEE (BIAS–5.15V) eliminate need for external bias rails - simplifies layout and improves gate drive reliability |
| Robust Startup & Fault Management | Multi-condition reset (UVLO on VIN/EXTVCC/INTVCC/INTVEE, EN/FBIN threshold, die temp >165°C) - ensures fail-safe operation in harsh environments |
| Precision Current Sensing | Separate ISP/ISN and CSP/CSN pairs with 50mV max sense voltage - enables accurate input/output current limiting without signal interference |
Applications
| Automotive Battery Management | Solar Panel MPPT Interface |
|---|---|
Use Scenario: Regulating 9–36V automotive battery input to stable 12V/3.5A 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; uses EN/FBIN for input voltage regulation and OPMODE for fixed topology. Use Value: 100% duty cycle capability in buck mode and 42V absolute max rating ensure uninterrupted operation during 12V system dips to 5V and surges to 40V. | Use Scenario: Converting variable 20–60V PV array output to 48V bus for energy storage in off-grid solar inverters. IC Role / Device Role / Timing Role: Configured as SEPIC via OPMODE=INTVCC to provide non-inverting buck-boost with isolation; uses CSP/CSN for output current limiting and RT for 300kHz switching. Use Value: Wide 4.5V–42V input range accommodates partial shading and low-light conditions; 15µA IQ preserves nighttime standby efficiency. |
| Industrial 24V Power Supply | Ruggedized IoT Edge Node |
Use Scenario: Generating isolated 5V/2A and 3.3V/1A rails from unregulated 18–36V factory floor supply with high ripple and EMI. IC Role / Device Role / Timing Role: Operated as synchronous buck with external MOSFETs; uses VC compensation for tight transient response; BG/TG drive 5mΩ NFET/PFET pair. Use Value: 2A gate drivers reduce MOSFET switching losses; 750kHz max fSW allows compact 4.7µH inductor and low-profile ceramic output caps. | Use Scenario: Powering LoRaWAN sensor nodes with LiSOCl₂ battery (3.6V) and 12V backup, requiring ultra-low IQ and reliable start-up at –40°C. IC Role / Device Role / Timing Role: Nonsynchronous buck-boost (OPMODE=100pF) delivers 3.3V/500mA; Burst Mode maintains <20µA system IQ; SS capacitor sets 10ms soft-start. Use Value: –40°C to +125°C guaranteed operation and 15µA Burst Mode IQ enable 10+ year battery life in remote deployments. |
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 | 4-switch synchronous buck-boost only; no SEPIC/ZETA support; higher IQ (25µA); requires external VREF | Optimized for bidirectional 12V/48V automotive systems; lacks input voltage regulation via EN/FBIN | Select when fixed 4-switch buck-boost suffices and higher efficiency at medium loads is prioritized over topology flexibility |
| LM5170QPWPRQ1 | Current-mode dual-channel controller; supports bidirectional operation; AEC-Q100 qualified; no built-in LDOs | Designed for high-current (>10A) automotive DC/DC and battery charging; requires external gate drivers and bias supplies | Select for AEC-Q100 compliance and >5A output capability where external component count is acceptable |
Compared with LTC3789EFE#PBF and LM5170QPWPRQ1, LT8711IUDC#PBF offers broader topology coverage (buck/boost/SEPIC/ZETA/buck-boost), integrated dual LDOs, and lower quiescent current - making it optimal for space-constrained, multi-rail industrial and automotive designs needing flexible, low-power conversion.
Availability
LT8711IUDC#PBF is available at Aetrix Electronics and suitable for automotive battery management, solar MPPT interfaces, and industrial 24V power supplies requiring stable component supply, extended temperature operation, and long-term lifecycle support.
Supply support for LT8711IUDC#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 industrial, automotive, communications, and healthcare markets.
The LT8711IUDC#PBF belongs to ADI's Power by Linear™ multitopology controller family, designed specifically for high-efficiency, wide-input DC/DC conversion in thermally demanding and electrically noisy environments.
FAQ
What is the maximum input voltage rating for the LT8711IUDC#PBF?
The LT8711IUDC#PBF has an absolute maximum input voltage rating of 42V on both VIN and EXTVCC pins. Its operational input range is specified from 4.5V to 42V, and it can operate down to 0V on VIN if EXTVCC exceeds 4.5V - a critical feature for automotive cold-crank and solar partial-shading scenarios. This rating is validated across the full –40°C to +125°C junction temperature range.
How does the OPMODE pin configure topology on the LT8711IUDC#PBF?
The OPMODE pin on the LT8711IUDC#PBF selects converter topology in hardware: grounding it configures buck or ZETA mode; connecting it to INTVCC selects SEPIC or boost; and tying it to a 100pF capacitor to GND enables nonsynchronous buck-boost. This pin directly controls internal logic blocks in the block diagram, and changing its state during operation triggers a full reset - ensuring deterministic mode transitions without latch-up or undefined states.
Does the LT8711IUDC#PBF support synchronization to an external clock?
Yes, the LT8711IUDC#PBF supports external clock synchronization via the SYNC pin. Driving SYNC with a logic-level clock (high >1.3V, low <0.4V) forces continuous conduction mode (FCM) and locks switching frequency to the external source. When SYNC is pulled below 0.4V, the device reverts to free-running operation or enters DCM/Burst Mode based on load. The recommended fSYNC/fOSC ratio is 0.8–1.2 for stable locking.
What are the gate driver voltage rails for TG and BG on the LT8711IUDC#PBF?
The TG driver on the LT8711IUDC#PBF swings between INTVEE (bottom rail) and BIAS (top rail), while the BG driver swings between GND (bottom rail) and INTVCC (top rail). INTVEE is regulated to 5.15V below BIAS, and INTVCC is regulated to 5.0V nominal - both with UVLO protection. These integrated LDOs eliminate external bias supplies and ensure proper gate overdrive across temperature and input conditions.
Can the LT8711IUDC#PBF regulate both input and output voltage simultaneously?
No, the LT8711IUDC#PBF does not perform simultaneous input and output voltage regulation. It supports two independent regulation modes: output voltage regulation via the FB pin (0.800V reference) and input voltage regulation via the EN/FBIN pin (1.200V reference). Only one loop dominates at a time - the higher commanded peak current determines actual operation. This dual-loop architecture enables flexible design trade-offs but requires careful resistor divider selection to avoid conflict.
LT8711IUDC#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)
LT8711IUDC#PBF FAQ
1.How can I place an order for LT8711IUDC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8711IUDC#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 LT8711IUDC#PBF reliable?
The price and inventory of LT8711IUDC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8711IUDC#PBF is usually 5 days.
3.What payment methods are accepted for LT8711IUDC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8711IUDC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8711IUDC#PBF?
LT8711IUDC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8711IUDC#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 LT8711IUDC#PBF?
For technical support, including LT8711IUDC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8711IUDC#PBF requirements.
6.How does Aetrix verify that LT8711IUDC#PBF is sourced from the original manufacturer or authorized distributors?
All LT8711IUDC#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 LT8711IUDC#PBF meets industry standards.
7.What is the process for return or replacement of LT8711IUDC#PBF?
All LT8711IUDC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8711IUDC#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 LT8711IUDC#PBF part is unused and in its original packaging.
Return procedure for LT8711IUDC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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