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Analog Devices Inc. LTC3786HUD#PBF
- Part No.:
- LTC3786HUD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3786HUD#PBF.pdf
- Description:
- PWR MGMT SWITCHING REGULATOR
- Quantity:
- Payment:
- Shipping:
Inventory:4,601
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Product details
Overview
LTC3786HUD#PBF from Analog Devices is a high-performance synchronous boost controller driving all-N-channel MOSFETs for 4.5V–38V input to up to 60V output, featuring 55µA no-load quiescent current, ±1% 1.2V reference, and 100% duty cycle capability-used in automotive start-stop systems requiring high-efficiency, wide-input, high-voltage DC-DC conversion.
For engineers reviewing the LTC3786HUD#PBF datasheet, LTC3786HUD#PBF pinout, LTC3786HUD#PBF application, or LTC3786HUD#PBF equivalent, key selection criteria include its AEC-Q100 qualification, phase-lockable 75kHz–850kHz operation, RSENSE/DCR current sensing, 16-pin 3mm × 3mm QFN package with exposed GND pad, and low shutdown current (<8µA).
Technical Context
The LTC3786HUD#PBF implements constant-frequency current-mode control with an internal error amplifier (2 mmho transconductance), precision 1.2V reference (±1% over temperature), and dual-mode light-load management via PLLIN/MODE pin-supporting Burst Mode® (55µA IQ), pulse-skipping, or forced continuous conduction. Its integrated 5.4V LDO powers gate drivers and logic circuits from VBIAS.
It features programmable oscillator (50kHz–900kHz) with external resistor or voltage control on FREQ pin, phase-locked loop synchronization (75kHz–850kHz), and robust protection including reverse-current detection (IREV), undervoltage lockout (3.6V/3.8V hysteresis), and thermal shutdown. The device supports both sense-resistor and DCR-based current sensing with 68mV–82mV threshold range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V (operates down to 2.5V after startup); enables compatibility with 12V/24V automotive batteries and industrial rails. |
| Output Voltage Range | Up to 60V; supports high-voltage loads like LED strings, industrial sensors, and auxiliary power rails. |
| Quiescent Current | 55µA in no-load operation; extends battery runtime in always-on automotive and medical devices. |
| Reference Accuracy | ±1% over –40°C to 150°C; ensures stable regulation across automotive under-hood temperature extremes. |
| Switching Frequency | Programmable 50kHz–900kHz or syncable 75kHz–850kHz; balances efficiency vs. size for inductor/capacitor selection. |
| Current Sense Method | RSENSE or inductor DCR sensing; reduces BOM cost and improves accuracy at high currents. |
| Duty Cycle Capability | 100% top-FET duty cycle; allows VIN-to-VOUT step-up with minimal dropout in high-ratio applications. |
| Package & Temp Grade | 16-pin 3mm × 3mm QFN (UD), exposed pad soldered to GND; rated for –40°C to 150°C junction (H-grade). |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN (UD) with exposed thermal pad (Pin 17 = GND). Requires PCB soldering of exposed pad for θJC = 4.2°C/W thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB (Pin 3) | Error amplifier feedback input | Connects to resistive divider across VOUT; regulates output by comparing to internal 1.2V reference. |
| SENSE+ (Pin 4) | Positive current sense comparator input | Connected to high-side of sense resistor or DCR network; common-mode range 2.5V–38V. |
| SENSE– (Pin 5) | Negative current sense comparator input | Connected to low-side of sense resistor; differential input accepts up to ±0.3V. |
| ITH (Pin 6) | Error amplifier output / current limit threshold | Voltage sets peak inductor current; 0.425V–2.8V range controls current limit and loop compensation. |
| SS (Pin 7) | Soft-start ramp control | Internal 10µA current charges external capacitor to linearly ramp VOUT during 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 programming | GND = 350kHz, INTVCC = 535kHz, resistor-to-GND = 50kHz–900kHz; enables precise frequency tuning. |
| RUN (Pin 10) | Enable/shutdown control | <1.28V = disable control loop; <0.7V = full shutdown (IQ <8µA); includes 100µA clamp and hysteresis. |
| GND (Pin 11, Exposed Pad 17) | Power and signal ground reference | Must be soldered to PCB plane; serves as return for bottom MOSFET source, CIN/COUT, and small-signal circuitry. |
| BG (Pin 12) | Bottom gate driver output | Drives main N-channel MOSFET gate; 1.2Ω pull-up/pull-down, 20ns rise/fall, 80ns dead-time control. |
| INTVCC (Pin 13) | Internal 5.4V LDO output | Supplies gate drivers and logic; requires ≥4.7µF low-ESR ceramic decoupling to GND. |
| VBIAS (Pin 14) | Main bias supply input | Accepts 4.5V–38V; powers internal LDO and logic; bypass capacitor required between VBIAS and GND. |
| BOOST (Pin 15) | Floating supply for top gate driver | Charged via charge pump from INTVCC; bypassed to SW node with capacitor for high-side NMOS drive. |
| TG (Pin 16) | Top gate driver output | Drives synchronous N-channel MOSFET gate; same drive strength and timing specs as BG pin. |
| SW (Pin 1) | Switch node connection | Connects to source of TG, drain of BG, and inductor; high dv/dt node requiring careful layout and snubbing. |
| PGOOD (Pin 2) | Open-drain power-good indicator | Pulled low when VOUT deviates >±10% from setpoint; 25µs delay prevents false trips during transients. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified (H-grade) | Rated for –40°C to 150°C junction temperature; validated for automotive start-stop, infotainment, and ADAS power rails. |
| Synchronous N-channel topology | Eliminates external Schottky diode; increases efficiency by 5–15% and reduces thermal stress in high-power boost stages. |
| Three selectable light-load modes | Burst Mode® (55µA IQ), pulse-skipping (low ripple), or forced CCM (constant frequency)-configurable per application needs. |
| Integrated 5.4V LDO with 50mA capability | Provides clean, regulated gate drive supply without external regulator; simplifies design and improves noise immunity. |
| Programmable soft-start via SS pin | External capacitor sets controlled VOUT ramp rate; prevents inrush current and stabilizes downstream regulators. |
| Reverse-current protection (IREV) | Disables top MOSFET before inductor current reverses; prevents shoot-through and maintains DCM operation in Burst Mode. |
Applications
| Automotive Start-Stop Systems | Industrial High-Voltage Power Supplies |
|---|---|
Use Scenario: Maintains 12V/24V bus stability during engine cranking when alternator output drops below battery voltage. IC Role / Device Role / Timing Role: Synchronous boost controller regulating output to 13.5V–28V from 4.5V–12V input; manages transient response via fast current-mode loop. Use Value: Enables uninterrupted operation of safety-critical ECUs and infotainment during 50ms–500ms cranking events with <8µA shutdown IQ. |
Use Scenario: Generates 48V or 60V bias for industrial PLC I/O modules, field transmitters, and valve actuators from 12V/24V DC rails. IC Role / Device Role / Timing Role: High-efficiency boost controller supporting up to 5A load with RSENSE or DCR sensing; operates at 300kHz to minimize EMI in noisy factory environments. Use Value: Delivers >94% efficiency at full load while meeting IEC 61000-4-2/4-4 immunity requirements due to low-noise Burst Mode® operation. |
| Medical Portable Diagnostic Equipment | High-Voltage Battery-Powered Systems |
Use Scenario: Powers CCD/CMOS image sensors and analog front-ends requiring clean, stable 24V/36V from single Li-ion (3.0V–4.2V) or dual-cell packs. IC Role / Device Role / Timing Role: Low-IQ boost controller with 55µA no-load current and programmable soft-start; uses DCR sensing to eliminate sense resistor losses. Use Value: Extends battery life by >20% versus discrete solutions; ±1% reference ensures accurate sensor biasing and ADC reference stability. |
Use Scenario: Steps up voltage from 25.2V (7S Li-ion) or 50.4V (14S) battery packs to 60V for motor drives or HV charging circuits. IC Role / Device Role / Timing Role: Robust boost controller with 38V absolute max VBIAS rating and 100% duty cycle support; handles wide VIN variation during discharge. Use Value: Supports >95% peak efficiency at 4A output with thermally enhanced QFN package; exposed pad enables direct heatsink attachment for >5W dissipation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8330EDD#PBF | Fixed 2MHz switching frequency; lower max VOUT (40V); no PLL sync; 3.5µA IQ but only 2A max output. | Better suited for compact, low-power applications where size trumps flexibility; lacks AEC-Q100 qualification. | Select LT8330EDD#PBF for space-constrained consumer or portable designs needing ultra-low IQ and fixed-frequency simplicity. |
| TPS40210DGQR | Non-synchronous (external diode); higher IQ (2.5mA); wider VBIAS (4.5V–52V); no soft-start or PGOOD; SOIC-8 package. | Lower cost for non-automotive industrial use; requires external diode and compensation; less efficient at high current. | Select TPS40210DGQR when BOM cost is critical and thermal constraints allow diode losses; not suitable for AEC-Q100 or high-efficiency demands. |
Compared with LT8330EDD#PBF and TPS40210DGQR, the LTC3786HUD#PBF delivers superior automotive-grade reliability, flexible frequency control, synchronous efficiency, and integrated diagnostics-making it optimal for high-performance, thermally demanding, and safety-critical boost applications.
Availability
LTC3786HUD#PBF is available at Aetrix Electronics and suitable for automotive start-stop systems, industrial high-voltage power supplies, and medical portable diagnostic equipment requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LTC3786HUD#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., a wholly owned subsidiary of Analog Devices, Inc.) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC3786HUD#PBF belongs to the LTC® high-efficiency power controller product line, designed specifically for demanding automotive, industrial, and medical DC-DC conversion where reliability, low IQ, and wide input/output ranges are essential.
FAQ
What is the maximum output voltage supported by the LTC3786HUD#PBF?
The LTC3786HUD#PBF supports output voltages up to 60V. This is enabled by its 71V absolute maximum BOOST pin rating and robust gate driver design capable of sustaining high-side NMOS operation across wide voltage differentials. The actual achievable VOUT depends on external MOSFET ratings, inductor saturation current, and output capacitor voltage rating-not the controller itself.
Does the LTC3786HUD#PBF require an external Schottky diode?
No, the LTC3786HUD#PBF does not require an external Schottky diode. It is a fully synchronous boost controller that drives both top and bottom N-channel MOSFETs. The internal gate drivers (TG and BG pins) provide complementary drive signals with programmable dead time, eliminating conduction losses and thermal issues associated with diode-based rectification.
How is light-load efficiency optimized in the LTC3786HUD#PBF?
The LTC3786HUD#PBF optimizes light-load efficiency via three selectable operating modes controlled by the PLLIN/MODE pin: Burst Mode® (55µA IQ), pulse-skipping, or forced continuous conduction. In Burst Mode®, the controller shuts down entirely between energy bursts, minimizing switching and bias losses-ideal for battery-powered automotive modules.
What package type and thermal characteristics apply to the LTC3786HUD#PBF?
The LTC3786HUD#PBF uses a 16-lead 3mm × 3mm plastic QFN (UD) package with an exposed thermal pad (Pin 17 = GND). Its thermal resistance is θJA = 68°C/W and θJC = 4.2°C/W. Proper soldering of the exposed pad to a large PCB copper area is mandatory to achieve rated thermal performance and sustain 150°C junction temperature.
Is the LTC3786HUD#PBF qualified for automotive applications?
Yes, the LTC3786HUD#PBF is AEC-Q100 qualified for automotive applications. It is rated for operation from –40°C to 150°C junction temperature (H-grade), includes built-in overtemperature protection, and meets stringent automotive reliability and qualification testing requirements-making it suitable for engine control units, ADAS cameras, and start-stop systems.
LTC3786HUD#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC3786HUD#PBF FAQ
1.How can I place an order for LTC3786HUD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3786HUD#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 LTC3786HUD#PBF reliable?
The price and inventory of LTC3786HUD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3786HUD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3786HUD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3786HUD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3786HUD#PBF?
LTC3786HUD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3786HUD#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 LTC3786HUD#PBF?
For technical support, including LTC3786HUD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3786HUD#PBF requirements.
6.How does Aetrix verify that LTC3786HUD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3786HUD#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 LTC3786HUD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3786HUD#PBF?
All LTC3786HUD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3786HUD#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 LTC3786HUD#PBF part is unused and in its original packaging.
Return procedure for LTC3786HUD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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