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Analog Devices Inc. LTC3786EUD#PBF
- Part No.:
- LTC3786EUD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3786EUD#PBF.pdf
- Description:
- IC REG CTRLR MULT TOPOLOGY 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:955
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Product details
Overview
LTC3786EUD#PBF from Analog Devices is a high-performance synchronous boost controller driving all-N-channel MOSFETs for high-efficiency DC/DC conversion. It operates from 4.5V–38V input (down to 2.5V post-startup), delivers up to 60V output, features ±1% 1.2V reference, 55µA no-load quiescent current, and supports programmable 50kHz–900kHz switching or PLL synchronization - enabling use in automotive start-stop systems and medical battery-powered equipment.
For engineers reviewing the LTC3786EUD#PBF datasheet, LTC3786EUD#PBF pinout, LTC3786EUD#PBF application, or LTC3786EUD#PBF equivalent, key selection considerations include its 16-pin 3mm × 3mm QFN package, RSENSE/DCR current sensing, 100% duty cycle capability, internal 5.4V LDO for gate drive, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LTC3786EUD#PBF implements constant-frequency current-mode control with an error amplifier regulating VFB to a precise 1.200V reference. Peak inductor current is set by the ITH voltage, which responds dynamically to load changes via feedback from an external resistor divider across VOUT.
Its dual-mode light-load operation-Burst Mode® (55µA IQ), pulse-skipping, or forced continuous conduction-is selected via the PLLIN/MODE pin. The internal PLL enables synchronization to external clocks from 75kHz to 850kHz, while the FREQ pin allows resistor-programmed frequency tuning or DC-voltage control of the VCO.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V (operates down to 2.5V after startup); supports wide battery chemistries and system architectures. |
| Output Voltage Range | Up to 60V; set via external resistive divider on VFB pin with ±1% reference accuracy. |
| Quiescent Current | 55µA in no-load Burst Mode®; extends runtime in battery-powered applications. |
| Switching Frequency | Programmable 50kHz–900kHz or synchronizable 75kHz–850kHz; balances efficiency vs. magnetics size. |
| Current Sensing | RSENSE or inductor DCR sensing; SENSE+/- common-mode range 2.5V–38V supports high-side input placement. |
| Gate Drive Supply | Internal 5.4V LDO on INTVCC pin; powers control circuitry and drivers without external bias supply. |
| Shutdown Current | <8µA when RUN pin <0.7V; enables ultra-low-power system-level standby states. |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN with exposed thermal pad (Pin 17 = GND). Requires soldering of exposed pad to PCB for rated θJC = 4.2°C/W thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch Node | Connects to source of top MOSFET, drain of bottom MOSFET, and inductor; carries high dv/dt switching waveform. |
| PGOOD (Pin 2) | Power Good Indicator | Open-drain output asserting low when VOUT deviates >±10% from regulation; 25µs delay prevents false trips. |
| VFB (Pin 3) | Error Amplifier Feedback Input | Receives divided output voltage; regulates VOUT to 1.200V reference with ±1% accuracy over temperature. |
| SENSE+ (Pin 4) | Positive Current Sense Input | Connects to high-side of sense resistor; supplies power to current comparator; CM range 2.5V–38V. |
| SENSE– (Pin 5) | Negative Current Sense Input | Connects to low-side of sense resistor; forms differential pair with SENSE+ for accurate current limiting. |
| ITH (Pin 6) | Error Amp Output / Current Limit Threshold | Voltage sets peak inductor current; directly controls PWM duty cycle in current-mode operation. |
| SS (Pin 7) | Soft-Start Control | Capacitor-to-ground ramps output voltage linearly; internal 10µA current charges SS pin to 1.2V for controlled startup. |
| PLLIN/MODE (Pin 8) | Sync Input / Light-Load Mode Select | Ground = Burst Mode®; INTVCC = forced CCM; 1.2V–(INTVCC−1.3V) = pulse-skipping; enables dynamic efficiency optimization. |
| FREQ (Pin 9) | Oscillator Frequency Control | Resistor-to-GND sets 50kHz–900kHz; GND = ~350kHz, INTVCC = ~535kHz; supports external DC voltage programming. |
| RUN (Pin 10) | Enable/Shutdown Control | <1.28V disables control loop; <0.7V shuts down INTVCC LDO and reduces IQ to <8µA; includes 100µA clamp and programmable hysteresis. |
| GND (Pin 11, Exposed Pad 17) | Signal & Thermal Ground | Reference for small-signal circuits, compensation network, and MOSFET sources; exposed pad must be soldered for thermal integrity. |
| BG (Pin 12) | Bottom Gate Driver Output | Drives gate of main N-channel MOSFET; 1.2Ω pull-up/pull-down resistance supports fast switching transitions. |
| INTVCC (Pin 13) | Internal 5.4V LDO Output | Supplies gate drivers and control logic; requires ≥4.7µF low-ESR ceramic capacitor to GND for stability. |
| VBIAS (Pin 14) | Main Bias Supply Input | Accepts 4.5V–38V input; powers internal LDO; bypass capacitor required between VBIAS and GND. |
| BOOST (Pin 15) | Floating Supply for Top MOSFET | Bypassed to SW via capacitor; powered by charge pump from INTVCC; enables high-side NMOS drive. |
| TG (Pin 16) | Top Gate Driver Output | Drives gate of synchronous top N-channel MOSFET; complements BG with matched timing and drive strength. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous N-MOS Control | Eliminates external Schottky diode losses; enables >95% efficiency at full load and reduced thermal design burden. |
| AEC-Q100 Qualified | Rated for automotive applications including start-stop systems; guaranteed –40°C to +125°C junction temperature operation. |
| 100% Duty Cycle Capability | Allows output voltage to approach input voltage during low-VIN conditions; maintains regulation even as VIN drops near VOUT. |
| Three Light-Load Operating Modes | Selectable via single pin: Burst Mode® (ultra-low IQ), pulse-skipping (low ripple), or forced CCM (constant frequency, lowest noise). |
| Integrated 5.4V LDO | Provides regulated gate drive supply from VBIAS; removes need for external bias rail and simplifies BOM. |
| Phase-Lockable Oscillator | Enables EMI reduction via clock synchronization to system master clock; supports jitter-free multi-phase designs. |
Applications
| Automotive Start-Stop Systems | Medical Portable Equipment |
|---|---|
Use Scenario: Maintains stable 24V rail during engine cranking when battery voltage dips to 6V–8V. IC Role / Device Role / Timing Role: Synchronous boost controller regulating output from low-input battery source using current-mode control and 100% duty cycle capability. Use Value: Ensures uninterrupted power to critical ECUs and sensors without brownouts, leveraging <8µA shutdown current and AEC-Q100 qualification. | Use Scenario: Powers isolated 48V subsystems in portable ultrasound or infusion pumps from single-cell Li-ion (3.0V–4.2V). IC Role / Device Role / Timing Role: High-efficiency boost controller delivering regulated high-voltage rails with minimal heat generation in thermally constrained enclosures. Use Value: Extends battery life via 55µA Burst Mode® IQ and enables compact design through 3mm × 3mm QFN package and integrated gate drive. |
| Industrial HV Battery Backup | Test & Measurement Power Supplies |
Use Scenario: Generates 48V backup rail from 24V industrial bus during AC mains failure. IC Role / Device Role / Timing Role: Synchronous boost controller supporting RSENSE or DCR current sensing for precise overcurrent protection in mission-critical infrastructure. Use Value: Delivers >94% efficiency at 5A load while maintaining ±1% output regulation and PGOOD monitoring for system-level fault detection. | Use Scenario: Provides programmable 12V–60V output in benchtop power supplies requiring low-noise, low-ripple performance. IC Role / Device Role / Timing Role: Precision-controlled boost controller with selectable pulse-skipping mode to minimize audible noise and RF emissions. Use Value: Enables clean output voltage with <10mVpp ripple via forced CCM or pulse-skipping modes, supported by 1.2V ±1% reference and soft-start control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3787EUD#PBF | Higher 150°C max junction temperature rating; identical pinout and feature set; optimized for extended-temperature industrial environments. | Preferred for under-hood automotive or high-ambient industrial deployments where thermal margin is critical. | Select LTC3787EUD#PBF when operating ambient exceeds 105°C or when AEC-Q100 H-grade qualification is required. |
| TPS40210DGQ | Non-synchronous controller (external Schottky required); lower IQ (100µA); no PLL sync; 4.5V–52V input; no 100% duty cycle support. | Suitable for cost-sensitive, non-automotive applications where efficiency >90% is acceptable and thermal constraints are relaxed. | Choose TPS40210DGQ only if synchronous rectification is not required and higher quiescent current is tolerable. |
Compared with LTC3786EUD#PBF, LTC3787EUD#PBF offers extended thermal capability without functional trade-offs, while TPS40210DGQ sacrifices efficiency and advanced features for lower cost and wider input range - making LTC3786EUD#PBF optimal for high-reliability, high-efficiency synchronous boost designs.
Availability
LTC3786EUD#PBF is available at Aetrix Electronics and suitable for automotive start-stop systems, portable medical devices, and industrial HV battery backup applications requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for LTC3786EUD#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 (now part of Analog Devices, Inc., following merger with Linear Technology) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies.
The LTC3786EUD#PBF belongs to Linear Technology's high-efficiency power controller product line, designed specifically for demanding synchronous boost applications in automotive, medical, and industrial systems where precision regulation, low IQ, and robust thermal performance are essential.
FAQ
What is the maximum output voltage supported by the LTC3786EUD#PBF?
The LTC3786EUD#PBF supports output voltages up to 60V, set via an external resistive divider on the VFB pin. Its internal 1.200V reference with ±1% accuracy ensures tight regulation across temperature and load, and the SENSE+/- pins tolerate up to 40V absolute maximum common-mode voltage - enabling reliable high-voltage boost operation.
Does the LTC3786EUD#PBF require an external Schottky diode?
No, the LTC3786EUD#PBF does not require an external Schottky diode. It is a synchronous boost controller that drives both top and bottom N-channel MOSFETs, eliminating conduction losses associated with diode rectification. The TG and BG outputs provide matched gate drive with built-in dead-time control, enabling high-efficiency operation without external diodes.
How is light-load efficiency optimized in the LTC3786EUD#PBF?
The LTC3786EUD#PBF optimizes light-load efficiency via three selectable modes on the PLLIN/MODE pin: Burst Mode® (55µA IQ), pulse-skipping, or forced continuous conduction. Burst Mode® disables switching and powers the load from output capacitance until regulation error triggers resumption - maximizing battery runtime in standby states without compromising transient response.
Can the LTC3786EUD#PBF operate with input voltage below 4.5V?
Yes, the LTC3786EUD#PBF can operate with input voltage as low as 2.5V after startup when biased from the output rail or an auxiliary supply. However, its specified input range is 4.5V–38V from VBIAS. Below 4.5V, operation depends on external biasing of INTVCC and proper sequencing - not guaranteed across temperature or process corners unless validated per application.
What package type and thermal characteristics apply to the LTC3786EUD#PBF?
The LTC3786EUD#PBF uses a 16-lead 3mm × 3mm plastic QFN package with exposed thermal pad (Pin 17 = GND). Its thermal resistance is θJA = 68°C/W and θJC = 4.2°C/W. The exposed pad must be soldered to a PCB copper plane for rated performance; insufficient thermal relief will cause junction temperature to exceed 125°C under typical 5A loads.
LTC3786EUD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, Flyback, SEPIC
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 38V
- Frequency - Switching:
- 105kHz ~ 760kHz
- Duty Cycle (Max):
- 96%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC3786EUD#PBF FAQ
1.How can I place an order for LTC3786EUD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3786EUD#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 LTC3786EUD#PBF reliable?
The price and inventory of LTC3786EUD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3786EUD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3786EUD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3786EUD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3786EUD#PBF?
LTC3786EUD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3786EUD#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 LTC3786EUD#PBF?
For technical support, including LTC3786EUD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3786EUD#PBF requirements.
6.How does Aetrix verify that LTC3786EUD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3786EUD#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 LTC3786EUD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3786EUD#PBF?
All LTC3786EUD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3786EUD#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 LTC3786EUD#PBF part is unused and in its original packaging.
Return procedure for LTC3786EUD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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