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Analog Devices Inc. LTC3786HUD#TRPBF
- Part No.:
- LTC3786HUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3786HUD#TRPBF.pdf
- Description:
- PWR MGMT SWITCHING REGULATOR
- Quantity:
- Payment:
- Shipping:
Inventory:2,201
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Product details
Overview
LTC3786HUD#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 50kHz–900kHz programmable switching frequency - used in automotive start-stop systems requiring stable high-voltage rail generation.
For engineers reviewing the LTC3786HUD#TRPBF datasheet, LTC3786HUD#TRPBF pinout, LTC3786HUD#TRPBF application, or LTC3786HUD#TRPBF equivalent, key selection criteria include its AEC-Q100 qualification, 16-pin 3mm × 3mm QFN package with exposed thermal pad, RSENSE/DCR current sensing flexibility, 100% duty cycle capability, and three light-load operating modes (Burst Mode®, pulse-skipping, continuous conduction).
Technical Context
The LTC3786HUD#TRPBF implements constant-frequency current-mode control with an internal error amplifier, transconductance gm = 2 mmho, and precision 1.2V reference (±1% over temperature). Its ITH pin serves dual roles: setting peak current limit and acting as compensation node for loop stability.
It integrates a phase-locked loop (PLL) for external clock synchronization (75kHz–850kHz), programmable oscillator (50kHz–900kHz via FREQ pin resistor), and dedicated logic for Burst Mode® operation - where sleep mode reduces IQ to 55µA by disabling gate drivers and disconnecting ITH from EA when load falls below threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V (40V abs max); operates down to 2.5V after startup when biased from output or auxiliary supply |
| Output Voltage Range | Up to 60V; set via external resistive divider at VFB pin with ±1% regulated 1.2V reference |
| Quiescent Current | 55µA at no load; enables extended battery runtime in portable and automotive systems |
| Switching Frequency | Programmable 50kHz–900kHz or synchronizable 75kHz–850kHz; trade-off between efficiency and magnetics size |
| Current Sensing | Supports RSENSE or inductor DCR sensing; SENSE+/- common-mode range: 2.5V–38V |
| Thermal Rating | AEC-Q100 qualified; H-grade junction temp range –40°C to +150°C; θJA = 68°C/W (QFN) |
| Gate Drive | Integrated 5.4V LDO (INTVCC); top/bottom gate drivers with 1.2Ω pull-up/pull-down and 80ns dead-time control |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN with exposed thermal pad (Pin 17 = GND), rated for TJ = –40°C to +150°C, 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 | Compares resistive-divider output voltage against 1.2V reference to regulate VOUT |
| SENSE+ (Pin 4) | Positive Current Sense Input | Connects to high-side of sense resistor or DCR network; supplies bias to current comparator |
| SENSE– (Pin 5) | Negative Current Sense Input | Connects to low-side of sense resistor; common-mode range extends to 2.5V–38V |
| ITH (Pin 6) | Error Amp Output / Current Limit Threshold | Sets peak inductor current; also used for loop compensation via external RC network |
| SS (Pin 7) | Soft-Start Control | Internal 10µA current charges external capacitor to ramp VOUT smoothly during startup |
| PLLIN/MODE (Pin 8) | Light-Load Mode Select / PLL Input | GND = Burst Mode®; INTVCC = forced CCM; 1.2V–(INTVCC–1.3V) = pulse-skipping; external clock = PLL sync |
| FREQ (Pin 9) | Oscillator Frequency Control | GND = ~350kHz; INTVCC = ~535kHz; resistor-to-GND sets 50kHz–900kHz; DC voltage tuning also supported |
| RUN (Pin 10) | Enable/Shutdown Control | <1.28V = disable control loop; <0.7V = full shutdown (IQ <8µA); includes 100µA clamp and programmable hysteresis |
| GND (Pin 11, Exposed Pad 17) | Signal & Thermal Ground | Reference for small-signal circuitry; exposed pad must be soldered for thermal performance and EMI reduction |
| BG (Pin 12) | Bottom Gate Driver Output | Drives gate of main N-channel MOSFET; 1.2Ω pull-down ensures fast turn-off |
| INTVCC (Pin 13) | Internal 5.4V LDO Output | Supplies gate drivers and control logic; requires ≥4.7µF ceramic decoupling to GND |
| VBIAS (Pin 14) | Main Bias Supply Input | Accepts 4.5V–38V; powers internal LDO and logic; bypass capacitor required |
| BOOST (Pin 15) | Floating Supply for Top MOSFET | Charged via internal charge pump; bypassed to SW with capacitor for high-side gate drive |
| TG (Pin 16) | Top Gate Driver Output | Drives gate of synchronous N-channel MOSFET; uses BOOST supply for level-shifting |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous N-MOS Control | Enables >95% efficiency at high power; eliminates external Schottky diode and associated losses |
| Three Light-Load Operating Modes | Burst Mode® (55µA IQ), pulse-skipping (low ripple), or forced CCM (constant frequency) - selectable via single pin |
| 100% Duty Cycle Capability | Allows VOUT ≈ VIN under low-input/high-output conditions without dropout or regulation loss |
| Robust Current Sensing Architecture | Supports both discrete shunt resistors and lossless DCR sensing with wide 2.5V–38V common-mode range |
| AEC-Q100 Qualified H-Temp Grade | Validated for automotive under-hood applications with guaranteed operation to +150°C junction temperature |
Applications
| Automotive Start-Stop Systems | Industrial High-Voltage Power Supplies |
|---|---|
Use Scenario: Maintaining stable 24V rail during engine cranking when battery voltage dips to 6V. IC Role / Device Role / Timing Role: Synchronous boost controller regulating output from 6V–16V input to 24V/5A with tight line/load regulation. Use Value: Enables uninterrupted operation of infotainment and ADAS modules during cold-crank events using only 55µA quiescent current. | Use Scenario: Generating isolated 48V bus from 24V industrial battery for PoE++ or motor drives. IC Role / Device Role / Timing Role: High-efficiency non-isolated boost stage delivering up to 60V output with programmable frequency for EMI compliance. Use Value: Reduces thermal stress via synchronous rectification and 100% duty cycle support, eliminating need for external diode. |
| Medical Portable Imaging Equipment | High-Voltage Battery-Powered Test Instruments |
Use Scenario: Powering CCD/CMOS sensor bias rails (±15V, +40V) from single-cell Li-ion (2.7V–4.2V). IC Role / Device Role / Timing Role: Primary boost controller enabling multi-rail generation with soft-start and PGOOD monitoring. Use Value: Ensures clean, glitch-free startup via SS pin ramp and precise ±1% reference for calibrated analog front-ends. | Use Scenario: Extending runtime of handheld oscilloscopes and multimeters requiring 30V analog supply from 3.7V Li-poly battery. IC Role / Device Role / Timing Role: Low-IQ boost controller supporting deep-discharge operation down to 2.5V input post-startup. Use Value: Maximizes usable battery capacity with 55µA no-load IQ and <8µA shutdown current, extending field-use time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3787EMSE#TRPBF | Same architecture but MSOP-16 package; lower max junction temp (125°C vs 150°C); identical electrical specs | Preferred for space-constrained industrial designs where thermal pad soldering is impractical | Select when board layout favors MSOP or ambient temperature stays below 105°C |
| MP24913GQ-Z | Monolithic 3A boost IC (integrated MOSFETs); fixed 500kHz freq; no PLL sync; max VOUT = 36V; IQ = 100µA | Suitable for lower-power, cost-sensitive applications where external FETs are unnecessary | Choose for simplified BOM and layout when output current ≤3A and VOUT ≤36V |
Compared with LTC3786HUD#TRPBF, the LTC3787EMSE#TRPBF offers identical functionality in a thermally less robust but easier-to-assemble package, while the MP24913GQ-Z trades design flexibility and high-voltage capability for integration and lower component count - making it appropriate only for sub-36V, ≤3A use cases.
Availability
LTC3786HUD#TRPBF is available at Aetrix Electronics and suitable for automotive start-stop systems, industrial high-voltage power supplies, and medical portable imaging equipment requiring stable component supply with AEC-Q100 assurance and extended temperature support.
Supply support for LTC3786HUD#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., 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#TRPBF belongs to the LTC® high-efficiency power controller product line, designed specifically for demanding automotive and industrial DC/DC conversion where reliability, low IQ, and wide input/output voltage ranges are critical.
FAQ
What is the maximum output voltage supported by the LTC3786HUD#TRPBF?
The LTC3786HUD#TRPBF supports output voltages up to 60V, determined by external feedback resistor divider and regulated against its ±1% 1.2V internal reference. Absolute maximum voltage ratings for BOOST and SW pins are 71V and 65V respectively, ensuring safe operation within this range when proper layout and component derating are applied.
Does the LTC3786HUD#TRPBF require external MOSFETs?
Yes, the LTC3786HUD#TRPBF is a controller-only IC and requires two external N-channel MOSFETs - one for the bottom switch (driven by BG pin) and one for the top synchronous rectifier (driven by TG pin). This architecture enables optimization for high-current, high-efficiency, or high-voltage applications beyond monolithic IC limits.
How does the LTC3786HUD#TRPBF achieve low quiescent current in battery-powered systems?
The LTC3786HUD#TRPBF achieves 55µA no-load quiescent current through optimized biasing, integrated low-power comparators, and adaptive sleep mode activation via the PLLIN/MODE pin. In shutdown (RUN < 0.7V), IQ drops further to <8µA - directly extending runtime in Li-ion–powered portable and automotive devices.
Can the LTC3786HUD#TRPBF synchronize to an external clock?
Yes, the LTC3786HUD#TRPBF supports external clock synchronization via the PLLIN/MODE pin. When an external clock signal is applied, the internal PLL locks the BG switching edge to the rising edge of that clock, enabling precise EMI frequency placement and multi-phase coordination across multiple converters.
Is the LTC3786HUD#TRPBF qualified for automotive applications?
Yes, the LTC3786HUD#TRPBF is AEC-Q100 qualified (Grade H, –40°C to +150°C junction temperature) and manufactured under controlled automotive processes. It is explicitly designated for automotive use in the Analog Devices ordering matrix and supports critical functions such as start-stop system rail generation and under-hood power conversion.
LTC3786HUD#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC3786HUD#TRPBF FAQ
1.How can I place an order for LTC3786HUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3786HUD#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 LTC3786HUD#TRPBF reliable?
The price and inventory of LTC3786HUD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3786HUD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3786HUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3786HUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3786HUD#TRPBF?
LTC3786HUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3786HUD#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 LTC3786HUD#TRPBF?
For technical support, including LTC3786HUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3786HUD#TRPBF requirements.
6.How does Aetrix verify that LTC3786HUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3786HUD#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 LTC3786HUD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3786HUD#TRPBF?
All LTC3786HUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3786HUD#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 LTC3786HUD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3786HUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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