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Analog Devices Inc. LTC3786IUD#PBF
- Part No.:
- LTC3786IUD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3786IUD#PBF.pdf
- Description:
- IC REG CTRLR MULT TOPOLOGY 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,034
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Product details
Overview
LTC3786IUD#PBF from Analog Devices is a high-performance synchronous boost controller driving all-N-channel MOSFETs for 4.5V–38V input, up to 60V output, with 55µA no-load quiescent current, ±1% 1.2V reference, and 50kHz–900kHz programmable switching frequency - used in automotive start-stop systems and high-voltage battery-powered industrial supplies.
For engineers reviewing the LTC3786IUD#PBF datasheet, LTC3786IUD#PBF pinout, LTC3786IUD#PBF application, or LTC3786IUD#PBF equivalent, key selection criteria include RSENSE/DCR current sensing capability, 100% duty cycle support for synchronous top-FET, phase-lockable frequency (75–850kHz), power-good monitoring, and thermally enhanced 3mm × 3mm QFN package with exposed GND pad.
Technical Context
The LTC3786IUD#PBF implements constant-frequency current-mode control with an internal error amplifier comparing VFB to a precision 1.2V reference, where ITH voltage sets peak inductor current. It supports three light-load operating modes-Burst Mode®, pulse-skipping, and forced continuous conduction-selected via the PLLIN/MODE pin.
Its integrated 5.4V LDO powers gate drivers and internal circuitry from VBIAS; BOOST charge pump enables high-side N-MOSFET drive; and SENSE+/- inputs accept common-mode voltages from 2.5V to 38V for accurate current sensing using either discrete shunt resistors or inductor DCR.
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 - enables high-voltage rail generation from low-input sources. |
| Quiescent Current | 55µA at no load - extends runtime in battery-powered applications like medical devices and portable instrumentation. |
| Reference Voltage Accuracy | ±1% over temperature - ensures stable output regulation across –40°C to +125°C junction range. |
| Switching Frequency | 50kHz to 900kHz programmable or 75kHz–850kHz PLL-synchronizable - balances efficiency vs. magnetics size. |
| Current Sense Method | RSENSE or inductor DCR - eliminates need for dedicated sense resistor in cost-sensitive designs. |
| Duty Cycle Capability | 100% - allows synchronous top-FET to remain on during dropout conditions, improving low-VIN operation. |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN with exposed thermal pad (Pin 17 = GND), rated for –40°C to +125°C operating junction temperature (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 - high dv/dt node requiring careful layout. |
| PGOOD (Pin 2) | Power-Good Indicator | Open-drain output asserting low when VOUT deviates >±10% from regulation - enables system-level fault detection and sequencing. |
| VFB (Pin 3) | Error Amplifier Feedback Input | Receives scaled output voltage via external resistor divider - sets regulated output voltage with ±1% accuracy. |
| SENSE+ (Pin 4) | Positive Current Sense Input | Connects to high-side of current sense resistor or DCR network - supports common-mode range up to 38V. |
| SENSE– (Pin 5) | Negative Current Sense Input | Connects to low-side of current sense resistor or DCR network - differential input with ±0.3V max offset tolerance. |
| ITH (Pin 6) | Error Amplifier Output / Current Limit Threshold | Voltage sets peak inductor current trip point - directly controls current limit and loop compensation. |
| SS (Pin 7) | Soft-Start Control | Capacitor-to-ground ramps output voltage linearly during startup - prevents inrush current and overshoot. |
| PLLIN/MODE (Pin 8) | Light-Load Mode Select / Sync Input | Selects Burst Mode® (GND), pulse-skipping (1.2V–INTVCC–1.3V), or forced CCM (INTVCC); accepts external clock for synchronization. |
| FREQ (Pin 9) | Oscillator Frequency Control | Resistor-to-GND or DC voltage sets switching frequency from 50kHz to 900kHz - enables optimization for efficiency or component size. |
| RUN (Pin 10) | Enable/Shutdown Control | Pulling below 1.28V disables control loop; below 0.7V reduces IQ to <8µA - supports system-level power sequencing. |
| GND (Pin 11, Exposed Pad Pin 17) | Signal & Power Ground | Return path for small-signal circuits, gate drivers, and input/output capacitors - exposed pad must be soldered for thermal performance. |
| 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 and can be tied to VIN or boosted output for extended low-VIN operation. |
| BOOST (Pin 15) | Floating Supply for Top Gate | Charged by internal charge pump - provides gate drive voltage above SW for synchronous top N-MOSFET. |
| TG (Pin 16) | Top Gate Driver Output | Drives gate of synchronous N-MOSFET - complements BG to enable full-N-channel synchronous rectification. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous N-MOSFET Control | Enables >95% efficiency at high power by eliminating body-diode conduction losses in both high- and low-side switches. |
| Three Light-Load Operating Modes | Burst Mode® (55µA IQ), pulse-skipping (low ripple), or forced CCM (constant frequency) - selectable per application noise/efficiency trade-offs. |
| Wide Input Voltage Range with Low Startup Threshold | Operates from 4.5V–38V input, and sustains regulation down to 2.5V after startup - ideal for automotive cold-crank and multi-cell battery systems. |
| Integrated 5.4V LDO and BOOST Charge Pump | Eliminates need for external bias supplies - INTVCC powers internal logic and gate drivers; BOOST enables high-side N-MOSFET drive without external bootstrap components. |
| AEC-Q100 Qualified Variant Available | LTC3786IUD#WPBF meets automotive reliability requirements - supports deployment in start-stop systems and infotainment power rails. |
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 variable 6–16V input to fixed 24V/5A. Use Value: 100% duty cycle capability and 2.5V post-startup operation ensure uninterrupted power delivery during deep voltage sag. | Use Scenario: Generating isolated 48V bus from 12V industrial PLC backplane. IC Role / Device Role / Timing Role: Primary non-isolated boost stage delivering up to 60V at 5A with precise ±1% output regulation. Use Value: ±1% reference and RSENSE/DCR sensing enable tight regulation without trimming, reducing BOM count and calibration effort. |
| Medical Portable Diagnostic Equipment | Battery-Powered Test Instruments |
Use Scenario: Powering CCD image sensors requiring clean 36V bias from dual Li-ion battery (6–8.4V). IC Role / Device Role / Timing Role: High-efficiency boost converter operating in Burst Mode® to minimize standby power draw. Use Value: 55µA no-load IQ extends battery life between measurements; soft-start prevents sensor supply transients. | Use Scenario: Providing calibrated 50V test voltage from 3.7V single-cell Li-ion pack. IC Role / Device Role / Timing Role: Precision boost controller with programmable frequency and external sync for EMI-controlled lab-grade output. Use Value: PLL-synchronizable 75–850kHz operation allows alignment with system clock to suppress beat frequencies in sensitive analog measurement paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3787IUD#PBF | Higher 1.5A integrated gate drivers; supports up to 10A output; identical pinout and feature set. | Targeted at higher-current designs requiring less external driver loss. | Select LTC3787IUD#PBF when output current exceeds 5A or when lower gate drive impedance is needed for faster FET switching. |
| TPS40210DGQ | Non-synchronous controller (external diode); wider 4.5–52V input; no integrated LDO or PGOOD. | Suitable for cost-sensitive, lower-efficiency applications where thermal constraints allow diode conduction loss. | Choose TPS40210DGQ only if synchronous efficiency is not required and board space permits discrete diode placement. |
Compared with LTC3786IUD#PBF, LTC3787IUD#PBF delivers higher peak gate drive current for larger MOSFETs but shares identical control architecture and pin compatibility, while TPS40210DGQ trades synchronous efficiency for broader input range and lower cost - making LTC3786IUD#PBF optimal for mid-power, thermally constrained, and automotive-qualified designs.
Availability
LTC3786IUD#PBF is available at Aetrix Electronics and suitable for automotive start-stop systems, industrial high-voltage power supplies, and battery-powered medical devices requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3786IUD#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 industrial, automotive, communications, and healthcare markets.
The LTC3786IUD#PBF belongs to Analog Devices' Power by Linear™ family of high-efficiency DC/DC controllers, designed specifically for demanding synchronous boost applications in automotive, industrial, and portable equipment where low IQ, wide VIN, and precision regulation are critical.
FAQ
What is the operating temperature range for the LTC3786IUD#PBF?
The LTC3786IUD#PBF is specified for operation from –40°C to +125°C junction temperature. This rating is validated across electrical parameters including reference voltage accuracy (±1%), quiescent current (55µA), and current sense threshold (75mV typ). The device uses the 3mm × 3mm QFN package with exposed thermal pad, and its thermal performance is characterized with θJA = 68°C/W. Derating applies above 125°C per Analog Devices' reliability guidelines.
Does the LTC3786IUD#PBF support both RSENSE and inductor DCR current sensing?
Yes, the LTC3786IUD#PBF supports both methods. Its SENSE+ and SENSE– inputs accept common-mode voltages from 2.5V to 38V and tolerate differential offsets up to ±0.3V, enabling direct connection to either a discrete shunt resistor or the parasitic DCR of a power inductor. The maximum sense threshold is 75mV (typ), and the current comparator features built-in filtering to reject switching noise - confirmed in the Electrical Characteristics table and Applications Information section of the LTC3786 datasheet Rev. E.
How does the PLLIN/MODE pin configure light-load operation on the LTC3786IUD#PBF?
The PLLIN/MODE pin on the LTC3786IUD#PBF selects among three distinct light-load behaviors: grounding it enables Burst Mode® (55µA IQ), tying it to INTVCC forces continuous conduction mode, and applying a DC voltage between 1.2V and INTVCC–1.3V activates pulse-skipping. These configurations are electrically defined in the Pin Functions section and verified in Figure 8 and the Operation chapter - each mode alters the controller's response to decreasing load current without changing external compensation.
Can the LTC3786IUD#PBF operate with an input voltage below 4.5V?
Yes - the LTC3786IUD#PBF can operate from as low as 2.5V after startup when biased from the output rail or an auxiliary supply, though its specified input range is 4.5V to 38V. This extended low-VIN capability is explicitly stated in the Features and Description sections and confirmed in Absolute Maximum Ratings (SENSE pins support 2.5V common-mode minimum). It is critical for automotive cold-crank scenarios where battery voltage collapses transiently.
What is the purpose of the BOOST pin on the LTC3786IUD#PBF?
The BOOST pin on the LTC3786IUD#PBF supplies gate drive voltage to the top N-channel MOSFET. It is charged by an internal charge pump referenced to the SW node, allowing the top gate to swing above the switch-node voltage - essential for fully enhancing an N-MOSFET in the high-side position. The BOOST pin must be bypassed to SW with a capacitor and optionally supplied via a Schottky diode from INTVCC, as detailed in the Pin Functions and Typical Application sections of the datasheet.
LTC3786IUD#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)
LTC3786IUD#PBF FAQ
1.How can I place an order for LTC3786IUD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3786IUD#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 LTC3786IUD#PBF reliable?
The price and inventory of LTC3786IUD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3786IUD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3786IUD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3786IUD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3786IUD#PBF?
LTC3786IUD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3786IUD#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 LTC3786IUD#PBF?
For technical support, including LTC3786IUD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3786IUD#PBF requirements.
6.How does Aetrix verify that LTC3786IUD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3786IUD#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 LTC3786IUD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3786IUD#PBF?
All LTC3786IUD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3786IUD#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 LTC3786IUD#PBF part is unused and in its original packaging.
Return procedure for LTC3786IUD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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