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Analog Devices Inc. LT8711IFE#PBF
- Part No.:
- LT8711IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8711IFE#PBF.pdf
- Description:
- IC REG CTRLR SYNC 20-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,205
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Product details
Overview
LT8711IFE#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 LT8711IFE#PBF datasheet, LT8711IFE#PBF pinout, LT8711IFE#PBF application, or LT8711IFE#PBF equivalent, key selection criteria include verified 2A gate drive capability (TG/ BG), confirmed 100% duty cycle support in buck mode, validated 0.800V FB regulation voltage, and documented OPMODE pin-based topology selection across TSSOP and QFN packages.
Technical Context
The LT8711IFE#PBF 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-output voltage via FB pin (0.800V reference) and input voltage via EN/FBIN pin (1.200V reference). Its architecture supports automatic low-noise Burst Mode operation below light-load thresholds while maintaining sub-50mV output ripple.
Topology selection is hardware-configured via OPMODE pin: grounded for buck/ZETA, tied to INTVCC for SEPIC/boost, or connected to 100pF capacitor to GND for nonsynchronous buck-boost. Reset logic monitors UVLO on VIN/EXTVCC (<4.5V), INTVCC (<3.6V), INTVEE (BIAS–INTVEE <3.6V), EN/FBIN state transitions, and die temperature (>165°C) to force SS discharge and switch disable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 42V (VIN can operate to 0V when EXTVCC > 4.5V); enables direct connection to automotive batteries and solar arrays without pre-regulation. |
| Quiescent Current (Burst Mode) | 15µA typical; extends runtime in battery-powered systems by minimizing no-load power draw. |
| Switching Frequency Range | 100kHz to 750kHz (free-running) or synchronizable to external clock; allows EMI optimization and inductor size reduction. |
| FB Regulation Voltage | 795mV to 816mV (min/max over temp); ensures precise output voltage accuracy across –40°C to 125°C junction range. |
| Gate Drive Capability | 2A sink/source per TG and BG outputs; supports fast switching of high-side PFETs and low-side NFETs with <14ns rise/fall times. |
| Duty Cycle Range | 0% to 100% (buck mode); maintains regulation during deep input voltage dropout conditions. |
| Current Sense Threshold | 46mV to 54mV (CSP–CSN); sets peak current limit with ±4mV tolerance, enabling accurate input current regulation. |
Pinout & Package
The LT8711IFE#PBF is packaged in a 20-lead TSSOP with exposed thermal pad (Pin 21 = GND), optimized for high-power density and thermal dissipation in industrial and automotive environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/FBIN (Pin 1) | Enable / Input Voltage Regulation Input | Enables chip above 1.03V; initiates soft-start above 1.35V; regulates input current when driven between 1.12V–1.27V. |
| FB (Pin 2) | Output Voltage Feedback Input | Regulated to 0.800V reference; determines output voltage via external resistor divider. |
| VC (Pin 3) | Error Amplifier Output | Drives compensation network; sets commanded peak current level for both FB and EN/FBIN regulation loops. |
| SS (Pin 4) | Soft-Start Timing Node | Charged by internal 410kΩ resistor; external capacitor controls ramp rate of switch current during startup. |
| OPMODE (Pin 5) | Topology Selection Control | GND = buck/ZETA; INTVCC = SEPIC/boost; 100pF-to-GND = nonsynchronous buck-boost. |
| ISP/ISN (Pins 6/7) | High-Side Current Sense Inputs | Kelvin-connected to sense resistor; used for input current limiting and regulation in boost/SEPIC modes. |
| INTVEE (Pin 8) | PFET Gate Driver Bottom Rail | 5.15V below BIAS (typical); must be bypassed with ≥2.2µF; enables TG switching only after UVLO exit (≥3.85V). |
| BIAS (Pin 9) | PFET Gate Driver Top Rail | Supplies TG driver; requires ≥2.2µF bypass to INTVEE; defines upper voltage rail for PFET gate swing. |
| TG (Pin 10) | PFET Gate Driver Output | 2A capable; swings between INTVEE (low) and BIAS (high); non-overlap timing prevents shoot-through. |
| BG (Pin 11) | NFET Gate Driver Output | 2A capable; swings between GND (low) and INTVCC (high); synchronized with TG but with controlled dead time. |
| INTVCC (Pin 13) | NFET Gate Driver Supply & Logic Rail | 5.0V LDO (typical); powered from VIN or EXTVCC; enables BG switching only after UVLO exit (≥4.1V). |
| VIN (Pin 14) | Main Input Supply | Primary power path for INTVCC; operates down to 0V if EXTVCC > 4.5V. |
| EXTVCC (Pin 15) | Alternate Input Supply | Backup power path for INTVCC; operates down to 0V if VIN > 4.5V. |
| CSP/CSN (Pins 16/17) | Low-Side Current Sense Inputs | Kelvin-connected to sense resistor; used for peak current limiting and overload protection in all topologies. |
| SYNC (Pin 19) | External Clock Synchronization Input | Accepts logic-level clock (1.3V high / 0.4V low); forces FCM operation when high; reverts to free-running when low. |
| RT (Pin 20) | Frequency Setting Resistor Input | Resistor to GND sets switching frequency; 30.3kΩ = 675kHz, 247kΩ = 85kHz (typical). |
| GND (Pin 21) | Power Ground Reference | Exposed thermal pad; must be soldered to PCB ground plane for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous multitopology support | Configurable as buck, boost, SEPIC, ZETA, or nonsynchronous buck-boost using single OPMODE pin-reduces BOM count across diverse power architectures. |
| Ultra-low quiescent current | 15µA in Burst Mode preserves battery life in always-on systems such as telematics and remote sensors without sacrificing regulation accuracy. |
| 100% duty cycle capability | Enables continuous conduction in buck mode during input voltage sag-critical for automotive cold-crank and industrial brownout resilience. |
| Dual independent gate drivers | 2A TG (PFET) and BG (NFET) drivers with matched rise/fall times (<14ns) and 70ns non-overlap ensure robust MOSFET switching and minimal cross-conduction loss. |
| Input voltage regulation | EN/FBIN pin provides programmable input current limiting and input voltage regulation-protects upstream sources like solar panels or weak batteries from collapse. |
| Integrated LDO regulators | INTVCC (5.0V) and INTVEE (BIAS–5.15V) supply rails eliminate need for external bias supplies, simplifying layout and improving system reliability. |
Applications
| Automotive Battery Management | Solar Panel MPPT Interface |
|---|---|
Use Scenario: Regulating 9V–36V automotive battery input to stable 12V/3.5A output under cold-crank (4.5V) and load-dump (42V) transients. IC Role / Device Role / Timing Role: Multitopology controller managing synchronous buck operation with 100% duty cycle support and input voltage regulation via EN/FBIN pin. Use Value: Maintains regulated output during 4.5V battery sag without external pre-regulator; reduces system cost and footprint versus discrete solutions. | Use Scenario: Converting variable 20V–60V solar panel output to fixed 48V bus for battery charging in off-grid inverters. IC Role / Device Role / Timing Role: Configured as SEPIC converter (OPMODE = INTVCC) to provide non-inverting step-up/step-down with input/output isolation. Use Value: Enables MPPT algorithm to regulate panel voltage independently of battery state-maximizing energy harvest across irradiance and temperature variations. |
| Industrial 24V Power Distribution | High-Voltage LED Driver Supply |
Use Scenario: Generating isolated 5V/2A and 15V/1A rails from unregulated 24V factory floor supply subject to line noise and dips. IC Role / Device Role / Timing Role: Operating in ZETA configuration (OPMODE = GND) to deliver tightly regulated outputs with inherent input-to-output ripple attenuation. Use Value: Eliminates need for post-regulation LDOs; achieves >92% efficiency at full load while meeting IEC 61000-4-5 surge immunity requirements. | Use Scenario: Driving 36V, 700mA high-brightness LED strings from 48V industrial bus with dimming control and short-circuit protection. IC Role / Device Role / Timing Role: Nonsynchronous buck-boost controller (OPMODE = 100pF-to-GND) delivering constant current via CSP/CSN sensing and adjustable soft-start. Use Value: Provides smooth dimming response and fast fault shutdown (<10µs) during LED string open/short events-meeting UL 8750 safety compliance. |
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 up to 60V input; includes integrated MOSFET drivers with higher 3.5A peak current; lacks nonsynchronous buck-boost mode. | Preferred for high-input-voltage (>42V) boost/SEPIC designs requiring higher gate drive strength; not suitable for buck-boost topology. | Select LTC3789EFE#PBF when input exceeds 42V or when driving larger MOSFETs with faster switching needs. |
| LM5170QQRGERQ1 | Automotive-grade (AEC-Q100); dual-channel current-mode controller; supports bidirectional current sensing; fixed 100kHz–1MHz frequency range. | Targeted for automotive bidirectional DC/DC converters (e.g., 48V/12V hybrid systems); adds phase interleaving and current sharing capability. | Choose LM5170QQRGERQ1 for AEC-Q100-compliant, bidirectional, or multi-phase designs where functional safety is required. |
Compared with LTC3789EFE#PBF and LM5170QQRGERQ1, the LT8711IFE#PBF offers unique support for nonsynchronous buck-boost topology and lowest quiescent current (15µA), making it optimal for cost-sensitive, wide-input, single-stage conversion where topology flexibility and battery longevity are prioritized over ultra-high voltage or automotive qualification.
Availability
LT8711IFE#PBF is available at Aetrix Electronics and suitable for automotive battery management, solar panel MPPT interfaces, and industrial 24V power distribution requiring stable component supply across extended temperature ranges.
Supply support for LT8711IFE#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and power management markets.
The LT8711IFE#PBF belongs to Analog Devices' Power by Linear™ multitopology controller product line, designed specifically for flexible, high-efficiency DC/DC conversion in harsh-environment applications demanding wide input range, low IQ, and topology adaptability.
FAQ
What is the operating temperature range for the LT8711IFE#PBF?
The LT8711IFE#PBF is rated for operation from –40°C to +125°C junction temperature. This industrial-grade rating is verified across all electrical specifications in the datasheet, including FB regulation voltage (795mV–816mV), quiescent current (15µA typical), and gate driver timing parameters. The "I" grade designation confirms full characterization and guarantee over this extended range, unlike the "E" grade which is specified from 0°C to 125°C.
Can the LT8711IFE#PBF be used in a synchronous buck-boost configuration?
No, the LT8711IFE#PBF does not support synchronous buck-boost operation. It explicitly supports synchronous buck, boost, SEPIC, and ZETA topologies, plus nonsynchronous buck-boost (requiring an external diode). The datasheet confirms that OPMODE pin configuration for nonsynchronous buck-boost uses a 100pF capacitor to GND, and the block diagram shows only one PFET and one NFET driver-no second synchronous switch driver is present. For true synchronous buck-boost, consider the LT8722 or LTC3789.
How is the switching frequency set on the LT8711IFE#PBF?
The switching frequency of the LT8711IFE#PBF is set using an external resistor connected from the RT pin (Pin 20) to GND. A 30.3kΩ resistor yields ~675kHz, while a 247kΩ resistor sets ~85kHz. The part also supports synchronization to an external clock applied to the SYNC pin (Pin 19), where logic-high input forces fixed-frequency mode and logic-low enables Burst Mode/DCM at light loads. Frequency tolerance is ±10% over temperature and supply variation.
What is the purpose of the EN/FBIN pin on the LT8711IFE#PBF?
The EN/FBIN pin on the LT8711IFE#PBF serves two distinct functions: chip enable/disable and input voltage regulation. Driving it above 1.03V (typical) enables the IC; above 1.35V (typical) initiates soft-start and switching. Between 1.12V and 1.27V, it commands input current limit to prevent source collapse-critical for solar and weak-battery applications. Below 0.2V, the device enters ultra-low-IQ shutdown (1µA typical). This dual-role pin eliminates need for external enable circuitry or separate input regulation ICs.
Does the LT8711IFE#PBF require external bootstrap capacitors for gate drive?
No, the LT8711IFE#PBF does not require external bootstrap capacitors. Its TG driver uses a charge-pump–less architecture powered directly from BIAS and INTVEE rails, while the BG driver is powered from INTVCC and GND-both internally regulated. The datasheet specifies minimum bypass capacitance (2.2µF each) on BIAS–INTVEE and INTVCC–GND, but no bootstrap components. This simplifies layout, improves reliability, and avoids bootstrap diode/capacitor failure modes common in high-duty-cycle applications.
LT8711IFE#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
LT8711IFE#PBF FAQ
1.How can I place an order for LT8711IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8711IFE#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 LT8711IFE#PBF reliable?
The price and inventory of LT8711IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8711IFE#PBF is usually 5 days.
3.What payment methods are accepted for LT8711IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8711IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8711IFE#PBF?
LT8711IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8711IFE#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 LT8711IFE#PBF?
For technical support, including LT8711IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8711IFE#PBF requirements.
6.How does Aetrix verify that LT8711IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8711IFE#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 LT8711IFE#PBF meets industry standards.
7.What is the process for return or replacement of LT8711IFE#PBF?
All LT8711IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8711IFE#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 LT8711IFE#PBF part is unused and in its original packaging.
Return procedure for LT8711IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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