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Analog Devices Inc. LTC3786EUD#TRPBF
- Part No.:
- LTC3786EUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3786EUD#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOPOLOGY 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,907
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Product details
Overview
LTC3786EUD#TRPBF 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 external PLL synchronization - used in automotive start-stop systems requiring stable high-voltage rail generation.
For engineers reviewing the LTC3786EUD#TRPBF datasheet, LTC3786EUD#TRPBF pinout, LTC3786EUD#TRPBF application, or LTC3786EUD#TRPBF equivalent, key selection criteria 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#TRPBF implements constant-frequency current-mode control with an error amplifier regulating VFB against a precision 1.2V reference. Peak inductor current is set by the ITH voltage, which responds dynamically to load changes via servo-loop feedback. The controller supports three light-load operating modes - Burst Mode® (55µA IQ), pulse-skipping, or forced continuous conduction - selected via the PLLIN/MODE pin.
Its integrated charge pump powers the top gate driver (TG), enabling 100% duty cycle operation. The internal 5.4V LDO (INTVCC) supplies gate drivers and logic, while SENSE+ and SENSE− accept common-mode voltages from 2.5V to 38V, supporting both sense-resistor and DCR-based current monitoring without external amplification.
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 industrial bus rails. |
| Output Voltage Range | Up to 60V; set via external resistor divider on VFB pin with ±1% regulation accuracy. |
| Quiescent Current | 55µA in no-load Burst Mode®; extends runtime in battery-powered automotive and medical devices. |
| Switching Frequency | Programmable 50kHz–900kHz or PLL-synchronized 75kHz–850kHz; balances efficiency vs. magnetics size. |
| Current Sensing | RSENSE or inductor DCR; SENSE+/- common-mode range 2.5V–38V enables direct high-side sensing. |
| Gate Drive Supply | Internal 5.4V LDO (INTVCC) with ±2% load regulation; powers control circuitry and drivers without external bias supply. |
| Shutdown Current | <8µA when RUN pin <0.7V; enables ultra-low-power system-level sleep states. |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN with exposed thermal pad (Pin 17 = GND). Requires soldering of exposed pad for thermal performance (θJA = 68°C/W).
| 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 by comparing to internal 1.2V reference with ±1% accuracy. |
| SENSE+ (Pin 4) | Positive Current Sense Input | High-side (+) input for current sense resistor or DCR network; CM range 2.5V–38V enables direct VIN-referenced sensing. |
| SENSE− (Pin 5) | Negative Current Sense Input | High-side (−) input; differential pair with SENSE+ sets current limit threshold (typ. 75mV). |
| ITH (Pin 6) | Error Amplifier Output / Current Limit Threshold | Voltage sets peak inductor current; directly controls PWM duty cycle in current-mode architecture. |
| SS (Pin 7) | Soft-Start Control | Capacitor-to-ground ramps output voltage linearly; internal 10µA current charges SS to 1.2V for controlled startup. |
| PLLIN/MODE (Pin 8) | Light-Load Mode Select / Sync Input | GND = Burst Mode®; INTVCC = forced CCM; 1.2V–(INTVCC−1.3V) = pulse-skipping; external clock = PLL sync. |
| FREQ (Pin 9) | Oscillator Frequency Control | Resistor-to-GND programs 50kHz–900kHz; voltage bias or tie to INTVCC/GND selects fixed 535kHz/350kHz. |
| RUN (Pin 10) | Enable/Shutdown Control | <1.28V disables control loop; <0.7V shuts down INTVCC LDO and reduces IQ to <8µA. |
| GND (Pin 11, Exposed Pad 17) | Signal & Power Ground | Reference for all small-signal circuits; exposed pad must be soldered for thermal integrity and noise immunity. |
| BG (Pin 12) | Bottom Gate Driver Output | Drives gate of main N-channel MOSFET; pull-up/pull-down resistance 1.2Ω enables fast switching. |
| INTVCC (Pin 13) | Internal 5.4V LDO Output | Supplies gate drivers and logic; requires ≥4.7µF ceramic capacitor to GND for stability and transient response. |
| VBIAS (Pin 14) | Main Bias Supply Input | Accepts 4.5V–38V; powers internal LDO and logic; bypass capacitor mandatory for noise rejection. |
| BOOST (Pin 15) | Floating Supply for Top Gate | Charged via internal charge pump; supplies TG driver above SW node for high-side NMOS drive. |
| TG (Pin 16) | Top Gate Driver Output | Drives gate of synchronous NMOS; enabled only when BOOST voltage is sufficient for full enhancement. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous N-Channel Control | Eliminates external Schottky diode; improves efficiency >5% at 5A and reduces thermal stress in compact layouts. |
| AEC-Q100 Qualified | Rated for automotive applications (–40°C to +125°C junction); includes overtemperature protection and robust ESD tolerance. |
| Three Light-Load Operating Modes | Selectable via single pin: Burst Mode® (55µA IQ), pulse-skipping (low ripple), or forced CCM (constant frequency, audio-friendly). |
| 100% Duty Cycle Capability | Enables VIN-to-VOUT step-up ratios approaching unity; critical for cold-crank scenarios in automotive start-stop systems. |
| Integrated Charge Pump & LDO | Removes need for external bootstrap capacitor or bias supply; simplifies layout and improves reliability across input transients. |
Applications
| Automotive Start-Stop Systems | Industrial High-Voltage Power Supplies |
|---|---|
Use Scenario: Maintains stable 24V rail during engine cranking when battery drops to 6V. IC Role / Device Role / Timing Role: Synchronous boost controller regulating output from low VIN with fast transient response and AEC-Q100 compliance. Use Value: Enables uninterrupted operation of ADAS cameras and infotainment during cold-crank events without external supervision. | Use Scenario: Generates 48V bias for industrial motor drives from 24V DC bus. IC Role / Device Role / Timing Role: High-efficiency, high-voltage boost controller with programmable frequency and DCR sensing. Use Value: Reduces heat sink requirements and eliminates discrete bootstrap networks in space-constrained PLC modules. |
| Medical Portable Equipment | Battery-Powered Test Instruments |
Use Scenario: Powers isolated 36V analog front-end in handheld ultrasound device from single Li-ion cell. IC Role / Device Role / Timing Role: Low-IQ synchronous boost controller with soft-start and power-good signaling. Use Value: Extends battery life beyond 8 hours per charge while ensuring clean, glitch-free startup of sensitive analog circuitry. | Use Scenario: Supplies 50V bias to precision DACs and op-amps in portable multimeter calibration module. IC Role / Device Role / Timing Role: Precision-regulated high-voltage generator with ±1% reference and low-noise operation. Use Value: Achieves 16-bit measurement accuracy by minimizing output ripple and load regulation error (<0.1%). |
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#TRPBF | Pin-compatible upgrade with improved current-sense accuracy (±2% vs ±3%), lower 35µA IQ, and extended 4.2V–40V input range. | Preferred for new designs requiring tighter current limiting or lower standby power in battery-critical systems. | Select LTC3787EUD#TRPBF when upgrading for higher accuracy or lower IQ; not drop-in due to revised FREQ pin behavior. |
| TPS40210DRCT | Non-synchronous controller; uses external Schottky diode; wider 4.5V–52V input but lacks PLL sync, PGOOD, and 100% duty cycle. | Suitable for cost-sensitive industrial supplies where efficiency >90% is not required and layout area allows diode placement. | Choose TPS40210DRCT only if synchronous rectification is unnecessary and thermal budget permits diode losses. |
Compared with LTC3786EUD#TRPBF, LTC3787EUD#TRPBF offers measurable improvements in accuracy and quiescent current but requires minor schematic review, while TPS40210DRCT trades efficiency and feature set for cost and input voltage margin - making LTC3786EUD#TRPBF optimal for automotive and high-reliability 24V–60V boost applications.
Availability
LTC3786EUD#TRPBF is available at Aetrix Electronics and suitable for automotive start-stop systems, industrial high-voltage power supplies, and portable medical equipment requiring stable component supply with AEC-Q100 assurance and long-term lifecycle support.
Supply support for LTC3786EUD#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 (now part of Analog Devices, Inc., following merger with Maxim Integrated) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC3786EUD#TRPBF belongs to the Power by Linear™ family of high-efficiency DC/DC controllers, designed specifically for demanding automotive, industrial, and medical applications requiring precision regulation, low quiescent current, and robust fault protection.
FAQ
What is the maximum output voltage supported by the LTC3786EUD#TRPBF?
The LTC3786EUD#TRPBF supports output voltages up to 60V, regulated via an external resistor divider on the VFB pin. Its ±1% 1.2V internal reference ensures tight output accuracy across temperature and line/load variations. The controller's BOOST and SW pins are rated for 71V and 65V respectively, providing sufficient margin for transient clamping in high-voltage boost designs using LTC3786EUD#TRPBF.
Does the LTC3786EUD#TRPBF require an external bootstrap capacitor?
No, the LTC3786EUD#TRPBF integrates a charge pump that generates the floating gate drive voltage for the top MOSFET (TG), eliminating the need for an external bootstrap capacitor. The BOOST pin is internally driven and must be bypassed to SW with a ceramic capacitor. This integration simplifies layout, improves reliability under low-duty-cycle conditions, and ensures consistent high-side drive in LTC3786EUD#TRPBF-based designs.
How does the LTC3786EUD#TRPBF achieve 55µA quiescent current?
The LTC3786EUD#TRPBF achieves 55µA quiescent current in Burst Mode® operation by disabling most internal circuitry-including gate drivers and oscillator-during light-load intervals. The error amplifier parks the ITH pin at 0.450V, and the controller wakes only when output droop triggers re-engagement. This behavior is confirmed in the datasheet's Figure G02 and Electrical Characteristics table (IQ = 55µA, Pulse-Skipping or Forced Continuous Mode), making LTC3786EUD#TRPBF ideal for battery-backed systems.
Can the LTC3786EUD#TRPBF operate with inductor DCR current sensing?
Yes, the LTC3786EUD#TRPBF supports both RSENSE and inductor DCR current sensing. Its SENSE+ and SENSE− inputs accept common-mode voltages from 2.5V to 38V and include filtering optimized for DCR's low-voltage, high-impedance signal. The datasheet specifies VSENSE(MAX) = 75mV (typ.) and provides RC compensation guidance in the Applications Information section - fully validated for LTC3786EUD#TRPBF in typical 12V→24V/5A designs.
Is the LTC3786EUD#TRPBF pin-compatible with other packages in the LTC3786 family?
Yes, the LTC3786EUD#TRPBF (16-pin 3mm × 3mm QFN) shares identical pinout and functionality with the MSOP-packaged variants (e.g., LTC3786EMSE#TRPBF), as confirmed in the Pin Configuration diagrams (Pages 2–3 of Rev. E datasheet). Both packages use the same 16-pin mapping and thermal pad grounding requirement, enabling direct PCB footprint interchangeability when thermal constraints allow - a verified design feature of the LTC3786EUD#TRPBF family.
LTC3786EUD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC3786EUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3786EUD#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 LTC3786EUD#TRPBF reliable?
The price and inventory of LTC3786EUD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3786EUD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3786EUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3786EUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3786EUD#TRPBF?
LTC3786EUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3786EUD#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 LTC3786EUD#TRPBF?
For technical support, including LTC3786EUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3786EUD#TRPBF requirements.
6.How does Aetrix verify that LTC3786EUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3786EUD#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 LTC3786EUD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3786EUD#TRPBF?
All LTC3786EUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3786EUD#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 LTC3786EUD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3786EUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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