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Analog Devices Inc. LTC3786HMSE#TRPBF
- Part No.:
- LTC3786HMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3786HMSE#TRPBF.pdf
- Description:
- PWR MGMT SWITCHING REGULATOR
- Quantity:
- Payment:
- Shipping:
Inventory:3,458
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Product details
Overview
LTC3786HMSE#TRPBF from Analog Devices is a high-performance synchronous boost controller driving dual N-channel MOSFETs in high-efficiency DC/DC step-up converters. 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. It is used in automotive start-stop systems requiring AEC-Q100-compliant, thermally robust power conversion.
For engineers reviewing the LTC3786HMSE#TRPBF datasheet, LTC3786HMSE#TRPBF pinout, LTC3786HMSE#TRPBF application, or LTC3786HMSE#TRPBF equivalent, key selection criteria include its 16-pin MSOP package with exposed thermal pad, 150°C junction-rated operation, RSENSE/DCR current sensing flexibility, 100% duty cycle capability, and PLL-synchronizable frequency control for EMI-sensitive designs.
Technical Context
The LTC3786HMSE#TRPBF implements constant-frequency current-mode control with an internal error amplifier, transconductance gm = 2 mmho, and precision 1.2V feedback reference. Its ITH pin serves as both current limit threshold and compensation node, enabling stable loop response across wide VIN/VOUT ratios.
It integrates a 5.4V internal LDO (INTVCC) for gate drivers and logic, supports three light-load modes via PLLIN/MODE pin (Burst Mode®, pulse-skipping, forced CCM), and includes reverse-current protection (IREV comparator) and power-good monitoring with 25µs delay and ±10% trip hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V (abs max 40V); operates down to 2.5V after startup - enables compatibility with 12V/24V automotive batteries and wide-input industrial rails. |
| Output Voltage Range | Up to 60V - supports high-voltage battery charging, LED drivers, and industrial sensor biasing without external level-shifting. |
| Quiescent Current | 55µA (no load, pulse-skipping/CCM) - extends runtime in always-on battery-powered medical or telematics systems. |
| Reference Accuracy | ±1% over –40°C to 150°C - ensures stable output regulation across full automotive temperature range without calibration. |
| Switching Frequency | 50kHz–900kHz programmable or 75kHz–850kHz PLL-synchronizable - allows EMI optimization and inductor size trade-offs. |
| Current Sense Threshold | 75mV typ (68–82mV over temp) - enables accurate, low-loss sensing with RSENSE or DCR, minimizing power loss at high currents. |
| Thermal Rating | Junction temperature range –40°C to 150°C - qualified per AEC-Q100 Grade H for under-hood automotive use. |
Pinout & Package
Package: 16-lead plastic MSOP (MSE) with exposed thermal pad (Pin 17 = GND), θJA = 40°C/W, rated for 150°C junction operation. Exposed pad must be soldered to PCB for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB (Pin 1) | Error amplifier feedback input | Connects to resistive divider on VOUT; regulates output by comparing to 1.2V internal reference with ±1% accuracy. |
| SENSE+ (Pin 2) | Positive current sense comparator input | Connects to high-side of sense resistor or DCR network; common-mode range 2.5V–38V supports high-side sensing. |
| SENSE– (Pin 3) | Negative current sense comparator input | Connects to low-side of sense resistor; differential input accepts up to ±0.3V; enables accurate peak-current mode control. |
| ITH (Pin 4) | Error amplifier output / current limit threshold | Setpoint for peak inductor current; also used for loop compensation; voltage range 0.425V–2.8V defines current limit window. |
| SS (Pin 5) | Soft-start ramp control | Internal 10µA current charges external capacitor; linear 0V→1.2V ramp controls VOUT rise time and inrush current. |
| PLLIN/MODE (Pin 6) | Light-load mode select & sync input | GND = Burst Mode®; INTVCC = forced CCM; 1.2V–(INTVCC–1.3V) = pulse-skipping; also accepts external clock for PLL synchronization. |
| FREQ (Pin 7) | Oscillator frequency programming | Resistor-to-GND sets 50kHz–900kHz; voltage input or tie to INTVCC/GND selects fixed 535kHz/350kHz - enables EMI spread-spectrum design. |
| RUN (Pin 8) | Enable/shutdown control | 1.28V threshold with 100mV hysteresis; <0.7V shutdown draws <8µA - supports system-level power sequencing and fault recovery. |
| GND (Pin 9 + Exposed Pad 17) | Power and signal ground reference | Must connect exposed pad to PCB ground plane; serves as return for SW, BG, SENSE–, and all small-signal circuitry. |
| BG (Pin 10) | Bottom gate driver output | Drives main N-channel MOSFET gate; 1.2Ω pull-up/pull-down, 20ns rise/fall - supports fast switching with low gate charge FETs. |
| INTVCC (Pin 11) | Internal 5.4V LDO output | Powers gate drivers and control logic; requires ≥4.7µF ceramic bypass to GND; load regulation ±0.5–2% up to 50mA. |
| VBIAS (Pin 12) | Main bias supply input | Accepts 4.5V–38V; powers internal circuits and enables bootstrap operation when tied to VOUT - eliminates need for auxiliary supply. |
| BOOST (Pin 13) | Floating supply for top gate driver | Connected via Schottky diode and capacitor to INTVCC; supplies TG driver during high-side conduction - enables 100% duty cycle. |
| TG (Pin 14) | Top gate driver output | Drives synchronous N-MOSFET gate; matched drive strength to BG; 80ns dead-time prevents shoot-through. |
| SW (Pin 15) | Switch node | Connects to source of TG, drain of BG, and inductor; high dv/dt node - requires tight layout and Kelvin sensing for stability. |
| PGOOD (Pin 16) | Open-drain power-good indicator | Asserts low when VOUT deviates >±10% for ≥25µs - enables system monitoring and fault-handling without external comparators. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade H qualification | Rated for –40°C to 150°C junction operation with automotive reliability testing - suitable for engine control, ADAS, and infotainment power rails. |
| Three selectable light-load modes | Burst Mode® (55µA IQ), pulse-skipping (low ripple), or forced CCM (constant frequency) - enables optimal efficiency/noise trade-off per application requirement. |
| 100% duty cycle capability | Enables VOUT ≤ VIN operation without dropout - critical for cold-crank support in 12V automotive systems where input may dip to 3V. |
| RSENSE or DCR current sensing | Flexible sensing architecture accommodates discrete shunts or integrated inductor DCR - reduces BOM cost and board space vs. dedicated sense resistors. |
| Internal 5.4V LDO with 50mA drive | Powers gate drivers and logic without external regulators - simplifies design and improves PSRR vs. externally biased controllers. |
| Phase-lockable oscillator (75–850kHz) | Synchronizes switching to system clock or noise-sensitive bands - essential for reducing beat frequencies in multi-rail automotive ECUs. |
Applications
| Automotive Start-Stop Systems | Industrial High-Voltage Bias Supplies |
|---|---|
Use Scenario: Maintains stable 12V/24V rail during engine cranking when battery voltage drops to 3–6V. IC Role / Device Role / Timing Role: Synchronous boost controller regulating output from low VIN with 100% duty cycle support and fast transient response. Use Value: Prevents ECU reset during cranking; AEC-Q100 H-grade ensures operation at 150°C under hood. |
Use Scenario: Generates 48V or 60V bias for industrial sensors, actuators, or PoE++ midspan equipment. IC Role / Device Role / Timing Role: High-efficiency step-up controller with ±1% reference and DCR sensing for compact, low-heat designs. Use Value: Eliminates need for isolated flyback; 55µA IQ extends uptime in battery-backed remote monitors. |
| Medical Portable Diagnostic Devices | LED Driver Power Stages |
Use Scenario: Powers CCD/CMOS image sensors and analog front-ends in handheld ultrasound or glucose meters. IC Role / Device Role / Timing Role: Low-noise, low-IQ boost controller with soft-start and PGOOD for safe power sequencing. Use Value: 55µA IQ maximizes battery life; Burst Mode® minimizes audible noise during imaging acquisition. |
Use Scenario: Drives high-brightness LED strings (e.g., 36V @ 1.5A) from 12V vehicle or 24V industrial supply. IC Role / Device Role / Timing Role: Constant-current-capable boost controller using ITH-based current regulation and PWM dimming interface. Use Value: ±1% reference ensures consistent LED brightness; 60V output supports long series strings without cascading converters. |
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 rated for –40°C to 125°C; lacks AEC-Q100 qualification; identical pinout and electrical specs. | Suitable for industrial/commercial systems without automotive temperature or reliability requirements. | Select when cost sensitivity outweighs extended temperature or automotive qualification needs. |
| TPS40210DGQR | Non-synchronous controller (external diode); higher 2.5mA IQ; no Burst Mode®; 4.5V–52V input; no PGOOD or SS pin. | Used where lower cost and simplicity justify reduced efficiency and lack of advanced features. | Choose only if synchronous FETs are not required and 55µA IQ is not critical for battery life. |
Compared with LTC3786HMSE#TRPBF, the LTC3787EMSE#TRPBF offers identical functionality at lower cost but excludes automotive qualification, while the TPS40210DGQR sacrifices efficiency, light-load performance, and integration for basic non-synchronous operation - making LTC3786HMSE#TRPBF the optimal choice for thermally demanding, high-reliability boost applications.
Availability
LTC3786HMSE#TRPBF is available at Aetrix Electronics and suitable for automotive start-stop systems, industrial high-voltage bias supplies, and medical portable diagnostic devices requiring stable component supply with AEC-Q100 compliance and 150°C operation.
Supply support for LTC3786HMSE#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 power management semiconductors.
The LTC3786 belongs to Analog Devices' high-efficiency power controller product line, designed specifically for demanding automotive and industrial DC/DC conversion where thermal resilience, precision regulation, and low quiescent current are critical.
FAQ
What is the maximum output voltage supported by the LTC3786HMSE#TRPBF?
The LTC3786HMSE#TRPBF supports output voltages up to 60V, as confirmed by Absolute Maximum Ratings (BOOST pin: –0.3V to 71V) and typical application circuits. This enables direct generation of high-voltage rails for LED drivers, industrial sensors, and battery charging without cascaded stages. The controller's internal reference and feedback architecture maintain ±1% regulation accuracy across this full range.
Does the LTC3786HMSE#TRPBF require an external bootstrap capacitor?
Yes, the LTC3786HMSE#TRPBF requires an external bootstrap capacitor connected between BOOST and SW pins. This capacitor, charged via an internal charge pump and Schottky diode from INTVCC, provides the floating supply needed to drive the top gate (TG) above the switch node voltage - enabling 100% duty cycle operation and efficient synchronous rectification.
How does the PLLIN/MODE pin configure light-load behavior in the LTC3786HMSE#TRPBF?
The PLLIN/MODE pin on the LTC3786HMSE#TRPBF selects among three light-load operating modes: grounding enables Burst Mode® (55µA IQ), tying to INTVCC forces continuous conduction mode (CCM), and applying 1.2V–(INTVCC–1.3V) enables pulse-skipping. Each mode directly affects efficiency, output ripple, and EMI profile - allowing system designers to optimize for battery life, noise, or transient response.
Is the LTC3786HMSE#TRPBF pin-compatible with other variants in the LTC3786 family?
Yes, the LTC3786HMSE#TRPBF is fully pin-compatible with all other LTC3786 variants in the 16-lead MSOP package (e.g., LTC3786EMSE#TRPBF, LTC3786IMSE#TRPBF), sharing identical pinout, electrical characteristics, and functional behavior. Only the guaranteed temperature range (–40°C to 150°C) and AEC-Q100 qualification distinguish the H-grade version.
What thermal considerations apply to the LTC3786HMSE#TRPBF in automotive applications?
The LTC3786HMSE#TRPBF is rated for –40°C to 150°C junction temperature and qualified per AEC-Q100 Grade H. To achieve this rating, the exposed thermal pad (Pin 17) must be soldered to a minimum 200mm² copper pour with ≥4 thermal vias to inner/ground planes. With θJA = 40°C/W in MSOP, 1W dissipation yields ~40°C rise above ambient - critical for under-hood placement near engines or inverters.
LTC3786HMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) 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-MSOP-EP
LTC3786HMSE#TRPBF FAQ
1.How can I place an order for LTC3786HMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3786HMSE#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 LTC3786HMSE#TRPBF reliable?
The price and inventory of LTC3786HMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3786HMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3786HMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3786HMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3786HMSE#TRPBF?
LTC3786HMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3786HMSE#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 LTC3786HMSE#TRPBF?
For technical support, including LTC3786HMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3786HMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3786HMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3786HMSE#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 LTC3786HMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3786HMSE#TRPBF?
All LTC3786HMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3786HMSE#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 LTC3786HMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3786HMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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