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Analog Devices Inc. LTC3786IUD#TRPBF
- Part No.:
- LTC3786IUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3786IUD#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOPOLOGY 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,380
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Product details
Overview
LTC3786IUD#TRPBF 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 - deployed in automotive start-stop systems and high-voltage battery-powered medical devices.
For engineers reviewing the LTC3786IUD#TRPBF datasheet, LTC3786IUD#TRPBF pinout, LTC3786IUD#TRPBF application, or LTC3786IUD#TRPBF equivalent, key selection criteria include its programmable 50kHz–900kHz switching frequency, RSENSE/DCR current sensing flexibility, Burst Mode® operation for ultra-low IQ, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LTC3786IUD#TRPBF implements constant-frequency current-mode control with an internal error amplifier (2 mmho transconductance), precision 1.2V reference (±1% over –40°C to 125°C), and dual-mode light-load management via PLLIN/MODE pin - enabling selectable Burst Mode®, pulse-skipping, or forced continuous conduction. Its ITH pin serves as both current limit threshold and compensation node.
It integrates a 5.4V internal LDO (INTVCC) for gate drivers and logic, supports external clock synchronization (75kHz–850kHz), and features a power-good open-drain output with ±10% trip hysteresis and 25µs delay. The BOOST charge pump supplies gate drive for the top N-MOSFET, enabling 100% duty cycle operation.
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 supply rails. |
| Output Voltage Range | Up to 60V; set via external resistor divider on VFB pin with ±1% regulated 1.2V reference. |
| Quiescent Current | 55µA in no-load pulse-skipping mode; extends runtime in battery-powered systems. |
| Switching Frequency | Programmable 50kHz–900kHz or syncable 75kHz–850kHz; balances efficiency vs. magnetics size. |
| Current Sensing | RSENSE or inductor DCR sensing; SENSE+/- common-mode range 2.5V–38V enables high-side sensing. |
| Duty Cycle | 100% capability; allows VIN-to-VOUT regulation even at near-unity ratio, critical for low-dropout boost. |
| Thermal Rating | –40°C to +125°C junction; QFN package with exposed pad (θJA = 68°C/W) requires PCB thermal anchoring. |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN with exposed GND pad (Pin 17), rated for –40°C to +125°C operation.
| 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 di/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 Input | Feedback node for output voltage regulation; referenced to internal 1.2V ±1% reference. |
| SENSE+ (Pin 4) | Current Sense (+) | Positive input of current comparator; connects to high-side of sense resistor or DCR network. |
| SENSE– (Pin 5) | Current Sense (–) | Negative input of current comparator; common-mode range 2.5V–38V enables input-side sensing. |
| ITH (Pin 6) | Error Amp Output / Current Limit Threshold | Sets peak inductor current; also used for loop compensation and light-load mode control. |
| SS (Pin 7) | Soft-Start Control | Internal 10µA current charges external capacitor to ramp VOUT smoothly during startup. |
| PLLIN/MODE (Pin 8) | Sync Input / Light-Load Mode Select | Ground = Burst Mode®; INTVCC = forced CCM; 1.2V–(INTVCC–1.3V) = pulse-skipping. |
| FREQ (Pin 9) | Oscillator Programming | GND = ~350kHz; INTVCC = ~535kHz; resistor-to-GND sets 50kHz–900kHz linearly. |
| 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) | Signal & Power Ground | Reference for all small-signal circuitry; exposed pad must be soldered for thermal performance (θJC = 4.2°C/W). |
| BG (Pin 12) | Bottom Gate Driver | Drives gate of main N-channel MOSFET; 1.2Ω pull-up/pull-down enables fast switching. |
| INTVCC (Pin 13) | Internal 5.4V LDO Output | Supplies gate drivers and logic; requires ≥4.7µF low-ESR ceramic bypass to GND. |
| VBIAS (Pin 14) | Main Bias Supply | Accepts 4.5V–38V input; powers internal circuits and enables operation from VIN or VOUT. |
| BOOST (Pin 15) | Floating Supply for Top Gate | Charge-pump output for TG driver; bypassed to SW with capacitor and fed from INTVCC via Schottky. |
| TG (Pin 16) | Top Gate Driver | Drives gate of synchronous N-MOSFET; enabled only when BOOST is charged and SW is low. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | Rated for automotive applications including start-stop systems; qualified per Grade I (–40°C to +125°C). |
| 100% Duty Cycle Operation | Enables VIN-to-VOUT regulation without dropout; critical for maintaining output during low-input transients. |
| Three Light-Load Modes | Selectable via PLLIN/MODE: Burst Mode® (55µA IQ), pulse-skipping (low ripple), or forced CCM (constant frequency). |
| Flexible Current Sensing | Supports both discrete RSENSE and lossless inductor DCR sensing - reduces BOM count and conduction losses. |
| Internal 5.4V LDO | Provides stable gate drive supply independent of input; eliminates need for external bias rail in many designs. |
| Phase-Lockable Oscillator | Allows synchronization to system clock (75kHz–850kHz), reducing EMI through frequency alignment. |
Applications
| Automotive Start-Stop Systems | High-Voltage Portable Medical Devices |
|---|---|
Use Scenario: Maintaining stable 24V rail during engine cranking when battery dips to 6V. IC Role / Device Role / Timing Role: Synchronous boost controller regulating 6V–16V input to 24V output with 100% duty cycle support. Use Value: Prevents system brownout during cold-cranking; AEC-Q100 qualification ensures reliability in under-hood environments. | Use Scenario: Powering 48V subsystems (e.g., imaging sensors, motor drivers) from a 12V Li-ion battery pack. IC Role / Device Role / Timing Role: High-efficiency boost stage delivering up to 5A at 48V with <55µA quiescent current. Use Value: Extends battery life between charges while meeting stringent medical EMC and safety requirements. |
| Industrial 24V/48V Field Bus Supplies | Battery-Backed Data Acquisition Nodes |
Use Scenario: Generating isolated 48V bus from 24V DC supply in factory automation PLCs. IC Role / Device Role / Timing Role: Primary non-isolated boost controller feeding downstream isolated DC/DC converters. Use Value: Wide 4.5V–38V input accommodates brownout and surge conditions; programmable frequency avoids noise-sensitive bands. | Use Scenario: Maintaining real-time clock and SRAM backup during main power failure using supercapacitor or coin cell. IC Role / Device Role / Timing Role: Ultra-low-IQ boost regulator charging backup rail from depleted 2.5V–3.3V source. Use Value: 55µA no-load IQ and 2.5V post-startup operation maximize hold-up time; soft-start prevents inrush into backup caps. |
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#TRPBF | Pin-compatible upgrade with improved light-load efficiency, lower 35µA IQ, and enhanced current-sense accuracy (±0.5% vs ±1%). | Preferred for new designs requiring lowest possible standby power and tighter current regulation. | Select LTC3787IUD#TRPBF when upgrading for higher precision or lower IQ; retains same PCB layout and external components. |
| TPS40210DRCT | Non-synchronous controller (external diode); wider 4.5V–52V input; no integrated LDO or PGOOD; 1.5mA typical IQ. | Suitable for cost-sensitive, non-automotive applications where efficiency >90% is acceptable and thermal margin exists. | Choose TPS40210DRCT only if synchronous FETs are already available externally and AEC-Q100 is not required. |
Compared with LTC3786IUD#TRPBF, the LTC3787IUD#TRPBF delivers measurable IQ reduction and tighter current sense tolerance without layout changes, while the TPS40210DRCT trades integration and automotive qualification for broader input range and lower unit cost in non-critical applications.
Availability
LTC3786IUD#TRPBF is available at Aetrix Electronics and suitable for automotive start-stop systems, portable medical instrumentation, and industrial 24V/48V field bus supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3786IUD#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 LTC3786 belongs to the Linear Technology (acquired by Analog Devices) high-efficiency power controller family, designed specifically for demanding automotive and industrial boost applications requiring ultra-low quiescent current and AEC-Q100 compliance.
FAQ
What is the operating temperature range for the LTC3786IUD#TRPBF?
The LTC3786IUD#TRPBF is specified for operation from –40°C to +125°C junction temperature. This rating applies to the "I" grade version in the 3mm × 3mm QFN package (UD), and is validated per AEC-Q100 Grade I requirements. Thermal design must account for θJA = 68°C/W and ensure the exposed GND pad is soldered to PCB copper for reliable heat dissipation.
Does the LTC3786IUD#TRPBF support both RSENSE and DCR current sensing?
Yes, the LTC3786IUD#TRPBF supports both methods. Its SENSE+ and SENSE– pins accept either a discrete current-sense resistor or the voltage drop across an inductor's DCR. The common-mode input range of 2.5V to 38V enables high-side sensing configurations, and the internal current comparator operates with ±1% accuracy over temperature - confirmed in the Electrical Characteristics table under VSENSE(MAX) and ISENSE+/- parameters.
How does the PLLIN/MODE pin configure light-load behavior in the LTC3786IUD#TRPBF?
The PLLIN/MODE pin selects among three distinct light-load modes: grounding it enables Burst Mode® operation (55µA IQ); tying it to INTVCC forces continuous conduction mode; applying a DC voltage between 1.2V and INTVCC–1.3V enables pulse-skipping. Each mode is explicitly defined in the Pin Functions and Operation sections of the datasheet, with corresponding efficiency curves shown in Figures G01–G03.
Can the LTC3786IUD#TRPBF operate with an input voltage below 4.5V?
Yes - after initial startup, the LTC3786IUD#TRPBF can operate from as low as 2.5V when biased from the output rail (VBIAS = VOUT) or an auxiliary supply. However, the minimum input voltage for startup remains 4.5V unless VBIAS is supplied externally above 4.5V. This dual-threshold behavior is documented in the Features and Absolute Maximum Ratings sections.
What is the purpose of the exposed pad (Pin 17) on the LTC3786IUD#TRPBF QFN package?
The exposed pad (Pin 17) is electrically and thermally connected to GND. It must be soldered to a PCB thermal pad to achieve the specified θJC = 4.2°C/W and prevent junction temperature exceedance. Leaving it unconnected degrades thermal performance significantly and risks reliability failure - a requirement explicitly stated in the Package Description and Absolute Maximum Ratings sections.
LTC3786IUD#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)
LTC3786IUD#TRPBF FAQ
1.How can I place an order for LTC3786IUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3786IUD#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 LTC3786IUD#TRPBF reliable?
The price and inventory of LTC3786IUD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3786IUD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3786IUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3786IUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3786IUD#TRPBF?
LTC3786IUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3786IUD#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 LTC3786IUD#TRPBF?
For technical support, including LTC3786IUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3786IUD#TRPBF requirements.
6.How does Aetrix verify that LTC3786IUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3786IUD#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 LTC3786IUD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3786IUD#TRPBF?
All LTC3786IUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3786IUD#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 LTC3786IUD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3786IUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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