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Analog Devices Inc. LTC3786EMSE#TRPBF
- Part No.:
- LTC3786EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3786EMSE#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOP 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,878
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Product details
Overview
LTC3786EMSE#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-used in automotive start-stop systems and high-voltage battery-powered medical devices.
For engineers reviewing the LTC3786EMSE#TRPBF datasheet, LTC3786EMSE#TRPBF pinout, LTC3786EMSE#TRPBF application, or LTC3786EMSE#TRPBF equivalent, key selection criteria include input voltage range (2.5V post-startup), programmable frequency (50kHz–900kHz), RSENSE/DCR current sensing, soft-start control via SS pin, and AEC-Q100 qualification for automotive use.
Technical Context
The LTC3786EMSE#TRPBF implements constant-frequency current-mode control with an internal error amplifier (2mmho transconductance) and precision 1.2V reference (±1% over temperature). Its ITH pin sets peak inductor current threshold, while SENSE+ and SENSE– support wide common-mode range (2.5V–38V) for accurate current sensing using either shunt resistor or DCR.
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, or forced continuous), and features phase-lockable operation (75kHz–850kHz) with external clock synchronization and adjustable fixed-frequency programming via FREQ pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V; operates down to 2.5V after startup when biased from output or auxiliary supply |
| Output Voltage Range | Up to 60V; set by external resistive divider on VFB pin referenced to 1.2V |
| Quiescent Current | 55µA in no-load pulse-skipping/continuous mode; enables long runtime in battery systems |
| Reference Accuracy | ±1% (1.188V–1.212V) over –40°C to 125°C; ensures stable regulation across temperature |
| Switching Frequency | Programmable 50kHz–900kHz or syncable 75kHz–850kHz; balances efficiency vs. component size |
| Current Sensing | RSENSE or inductor DCR; SENSE+/- common-mode range 2.5V–38V supports high-side sensing |
| Duty Cycle | 100% capability for top MOSFET; enables dropout operation during low-input conditions |
Pinout & Package
Package: 16-lead plastic MSOP (3mm × 4.9mm), exposed pad (Pin 17) soldered to PCB for thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB (Pin 1) | Error amplifier feedback input | Connects to output voltage divider; regulates output to 1.2V reference with ±1% accuracy |
| SENSE+ (Pin 2) | Positive current sense comparator input | Typically tied to high-side of sense resistor; supplies power to current comparator |
| SENSE– (Pin 3) | Negative current sense comparator input | Connected to low-side of sense resistor; common-mode range extends to 2.5V–38V |
| ITH (Pin 4) | Error amplifier output / current limit threshold | Voltage sets peak inductor current; determines load current capability per cycle |
| SS (Pin 5) | Soft-start ramp control | Internal 10µA current charges external capacitor to linearly ramp output voltage at startup |
| PLLIN/MODE (Pin 6) | Light-load mode selection & sync input | GND = Burst Mode®; INTVCC = forced continuous; 1.2V–(INTVCC–1.3V) = pulse-skipping |
| FREQ (Pin 7) | Oscillator frequency programming | Resistor-to-GND sets 50kHz–900kHz; DC voltage or INTVCC/GND selects fixed frequencies |
| RUN (Pin 8) | Enable/shutdown control | <1.28V disables control loop; <0.7V reduces IQ to <8µA and disables INTVCC LDO |
| GND (Pin 9, Exposed Pad 17) | Power and signal ground | Must be soldered to PCB; connects to bottom MOSFET source and CIN/COUT negatives |
| BG (Pin 10) | Bottom gate driver output | Drives gate of main N-channel MOSFET; 1.2Ω pull-up/pull-down resistance |
| INTVCC (Pin 11) | Internal 5.4V LDO output | Supplies gate drivers and control circuitry; requires ≥4.7µF ceramic decoupling to GND |
| VBIAS (Pin 12) | Main bias supply input | Accepts 4.5V–38V; powers internal circuits and enables operation down to 2.5V post-startup |
| BOOST (Pin 13) | Floating supply for top MOSFET | Bypassed to SW node; supplies gate drive for synchronous NMOS using charge pump |
| TG (Pin 14) | Top gate driver output | Drives gate of synchronous top N-MOSFET; includes dead-time control (80ns min) |
| SW (Pin 15) | Switch node connection | Connects to source of TG, drain of BG, and boost inductor; handles high dv/dt switching |
| PGOOD (Pin 16) | Open-drain power-good indicator | Pulls low when VOUT deviates >±10% from regulation; 25µs delay prevents false trips |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous N-MOSFET control | Enables >95% efficiency at full load and eliminates external Schottky losses |
| Low-IQ operation (55µA) | Extends battery life in portable and automotive applications without compromising regulation |
| AEC-Q100 qualified (Grade I) | Validated for automotive environments including start-stop systems and infotainment power rails |
| Three selectable light-load modes | Burst Mode® (max efficiency), pulse-skipping (low ripple), or forced continuous (lowest noise) |
| 100% duty cycle capability | Allows seamless transition during VIN drop below VOUT, critical for cold-crank scenarios |
| Integrated 5.4V LDO (INTVCC) | Eliminates need for external bias rail; powers gate drivers and internal logic reliably |
Applications
| Automotive Start-Stop Systems | Medical Portable Power Supplies |
|---|---|
Use Scenario: Maintains stable 24V rail during engine cranking where battery voltage dips to 6V. IC Role / Device Role / Timing Role: Synchronous boost controller regulating output from 6V–16V input to 24V with 100% duty cycle support. Use Value: Prevents system brownout during cold-crank events; AEC-Q100 qualification ensures reliability under automotive thermal and EMI stress. | Use Scenario: Powers imaging modules in portable ultrasound devices requiring clean, regulated high-voltage rails. IC Role / Device Role / Timing Role: High-efficiency boost controller delivering up to 60V from Li-ion battery input (3.0V–4.2V). Use Value: 55µA quiescent current extends battery runtime; low-noise pulse-skipping mode minimizes interference with analog front-end signals. |
| Industrial HV Battery Backup | Test Equipment Power Rails |
Use Scenario: Provides uninterrupted 48V output from 24V backup battery during AC mains failure. IC Role / Device Role / Timing Role: Synchronous boost controller with RSENSE/DCR sensing for precise current limiting and fault protection. Use Value: ±1% reference and programmable soft-start ensure repeatable, safe power-up of sensitive instrumentation loads. | Use Scenario: Generates programmable high-voltage bias for semiconductor parametric testers. IC Role / Device Role / Timing Role: Precision-controlled boost converter with external frequency sync for EMI-sensitive lab environments. Use Value: Phase-lockable operation (75kHz–850kHz) allows clock alignment to avoid beat frequencies with other instruments. |
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 pinout, enhanced current-sense accuracy (±0.5% vs ±1%), higher max frequency (1MHz), no AEC-Q100 grade | Preferred for precision industrial test equipment; not qualified for automotive deployment | Select when tighter current regulation and higher switching frequency are required, and automotive qualification is unnecessary |
| TPS40210DRCT | Non-synchronous (external diode), wider input (4.5V–52V), higher IQ (2.5mA), no PGOOD or soft-start | Suitable for cost-sensitive non-automotive applications where efficiency >90% is acceptable | Choose only if synchronous rectification is not required and lower BOM cost outweighs efficiency and feature trade-offs |
Compared with LTC3786EMSE#TRPBF, LTC3787EMSE#TRPBF offers improved current-sense accuracy and frequency headroom but lacks automotive qualification, while TPS40210DRCT sacrifices efficiency and integrated features for broader input range and lower cost-making LTC3786EMSE#TRPBF optimal for AEC-Q100-compliant, high-efficiency boost designs.
Availability
LTC3786EMSE#TRPBF is available at Aetrix Electronics and suitable for automotive start-stop systems, portable medical devices, and industrial HV battery backup requiring stable component supply, AEC-Q100 compliance, and low-quiescent-current operation.
Supply support for LTC3786EMSE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3786 belongs to Analog Devices' Power by Linear™ synchronous controller family, designed specifically for high-efficiency, wide-input-range DC/DC boost conversion in safety-critical and thermally constrained applications.
FAQ
What is the minimum operating input voltage for LTC3786EMSE#TRPBF after startup?
The LTC3786EMSE#TRPBF can operate from as low as 2.5V after startup when biased from its own output or an auxiliary supply-enabling functionality during deep battery discharge or cold-crank events where input drops below the nominal 4.5V minimum. This behavior is distinct from initial startup, which requires ≥4.5V on VBIAS.
Does LTC3786EMSE#TRPBF support both RSENSE and inductor DCR current sensing?
Yes, LTC3786EMSE#TRPBF supports both methods: SENSE+ and SENSE– pins accept differential voltage from a shunt resistor or DCR-based sensing network. The common-mode range (2.5V–38V) and internal comparator architecture allow direct integration with either topology without external amplification.
How does the PLLIN/MODE pin configure light-load operation in LTC3786EMSE#TRPBF?
The PLLIN/MODE pin selects among three modes: grounding enables Burst Mode® (highest efficiency), tying to INTVCC forces continuous conduction (lowest noise), and applying 1.2V–(INTVCC–1.3V) activates pulse-skipping (balanced ripple and efficiency). Each mode alters switching behavior and current waveform shape without changing external components.
Is LTC3786EMSE#TRPBF pin-compatible with other variants in the LTC3786 family?
Yes, LTC3786EMSE#TRPBF shares identical pinout and footprint with all MSOP-packaged LTC3786 variants (e.g., LTC3786IMSE#TRPBF, LTC3786HMSE#TRPBF), differing only in temperature grade and qualification level-allowing drop-in replacement within the same package format when design margins permit.
What thermal considerations apply to the exposed pad of LTC3786EMSE#TRPBF?
The exposed pad (Pin 17) of LTC3786EMSE#TRPBF must be soldered to a PCB copper plane to achieve rated thermal performance (θJA = 40°C/W). Inadequate soldering or insufficient copper area increases junction temperature, potentially triggering thermal shutdown or reducing lifetime-especially under sustained 5A+ output current conditions.
LTC3786EMSE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3786EMSE#TRPBF FAQ
1.How can I place an order for LTC3786EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3786EMSE#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 LTC3786EMSE#TRPBF reliable?
The price and inventory of LTC3786EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3786EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3786EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3786EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3786EMSE#TRPBF?
LTC3786EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3786EMSE#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 LTC3786EMSE#TRPBF?
For technical support, including LTC3786EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3786EMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3786EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3786EMSE#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 LTC3786EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3786EMSE#TRPBF?
All LTC3786EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3786EMSE#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 LTC3786EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3786EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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