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Analog Devices Inc. LTC3786EMSE#PBF
- Part No.:
- LTC3786EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3786EMSE#PBF.pdf
- Description:
- IC REG CTRLR MULT TOP 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,743
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Product details
Overview
LTC3786EMSE#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 programmable 50kHz–900kHz switching frequency - used in automotive start-stop systems and high-voltage battery-powered industrial supplies.
For engineers reviewing the LTC3786EMSE#PBF datasheet, LTC3786EMSE#PBF pinout, LTC3786EMSE#PBF application, or LTC3786EMSE#PBF equivalent, key selection criteria include RSENSE/DCR current sensing capability, 100% duty cycle support for synchronous top-FET, phase-lockable frequency (75kHz–850kHz), low shutdown current (<8µA), and AEC-Q100 qualification for automotive use.
Technical Context
The LTC3786EMSE#PBF implements constant-frequency current-mode control with an internal error amplifier (2mmho transconductance) and precision 1.2V reference (±1% over temperature). It supports three light-load operating modes-Burst Mode®, pulse-skipping, and forced continuous conduction-selected via the PLLIN/MODE pin.
Its dual-gate drivers deliver 1.2Ω pull-up/pull-down resistance, 20ns rise/fall times, and 80ns dead-time control. The integrated 5.4V LDO powers internal circuitry and gate drivers from VBIAS, while the BOOST charge pump enables high-side N-MOSFET drive with up to 85µA available current.
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; set via external resistor divider on VFB pin with ±1% regulation accuracy. |
| Quiescent Current | 55µA in no-load operation; extends runtime in battery-powered systems such as medical devices and portable test equipment. |
| Switching Frequency | Programmable 50kHz–900kHz or synchronizable 75kHz–850kHz; trade-off between efficiency and magnetics size. |
| Current Sensing | RSENSE or inductor DCR sensing; SENSE+/- common-mode range 2.5V–38V enables high-side or low-side placement. |
| Gate Drive Capability | Integrated 5.4V LDO (INTVCC) and BOOST charge pump; supports 100% duty cycle for synchronous top-FET. |
| Thermal Rating | –40°C to +125°C junction; MSOP-16 package with exposed pad (θJA = 40°C/W). |
Pinout & Package
Package: 16-lead plastic MSOP (MSE) with exposed thermal pad (Pin 17 = GND), rated for –40°C to +125°C operation. Requires soldering of exposed pad for thermal performance (θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB (Pin 1) | Error amplifier feedback input | Connects to resistive divider across VOUT; regulates output to 1.2V reference with ±1% accuracy. |
| SENSE+ (Pin 2) | Positive current sense comparator input | Accepts high-side or low-side current sense resistor voltage; CM range 2.5V–38V. |
| SENSE– (Pin 3) | Negative current sense comparator input | Differential input with ±0.3V max offset; enables accurate current limiting and protection. |
| ITH (Pin 4) | Error amplifier output / current limit threshold | Voltage sets peak inductor current; determines load-current response and stability compensation point. |
| SS (Pin 5) | Soft-start ramp control | Internal 10µA current charges external capacitor to linearly ramp VOUT during startup. |
| 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. |
| FREQ (Pin 7) | Oscillator frequency programming | Resistor-to-GND sets 50kHz–900kHz; voltage bias or tie to INTVCC/GND selects fixed frequencies. |
| RUN (Pin 8) | Enable/shutdown control | <1.28V disables control loop; <0.7V reduces IQ to <8µA; includes 100µA clamp and programmable hysteresis. |
| GND (Pin 9 & Exposed Pad 17) | Power and signal ground reference | Must be connected to PCB ground plane; exposed pad is mandatory for thermal performance. |
| BG (Pin 10) | Bottom gate driver output | Drives main N-channel MOSFET gate; 1.2Ω pull-up/down, 20ns transition, 80ns dead-time control. |
| INTVCC (Pin 11) | Internal 5.4V LDO output | Supplies gate drivers and control logic; requires ≥4.7µF ceramic decoupling to GND. |
| VBIAS (Pin 12) | Main bias supply input | Accepts VIN or boosted output; 4.5V–38V range powers internal LDO and logic; bypass to GND required. |
| BOOST (Pin 13) | Floating supply for top gate driver | Charged by internal charge pump; bypassed to SW node; enables high-side N-MOSFET drive. |
| TG (Pin 14) | Top gate driver output | Drives synchronous N-MOSFET gate; same drive strength and timing specs as BG pin. |
| SW (Pin 15) | Switch node connection | Connects to source of TG, drain of BG, and inductor; high dv/dt node requiring careful layout. |
| 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 highest efficiency (>95% typical at 5A) and eliminates body-diode conduction losses in boost topology. |
| AEC-Q100 qualified | Validated for automotive applications including start-stop systems; supports –40°C to +125°C operation. |
| Three selectable light-load modes | Burst Mode® (55µA IQ), pulse-skipping (low ripple), or forced CCM (constant frequency) - selected via single pin. |
| Flexible current sensing | Supports both discrete shunt (RSENSE) and lossless inductor DCR sensing - reduces BOM count and improves thermal efficiency. |
| Robust gate drive architecture | Dual 1.2Ω drivers with matched 20ns transitions and programmable dead time prevent shoot-through in high-power designs. |
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 12V input to 24V output with fast transient response and low dropout. Use Value: Enables uninterrupted operation of ADAS sensors and infotainment during cold-cranking events; AEC-Q100 qualification ensures reliability. | Use Scenario: Generating isolated 48V bias from 24V industrial bus for PLC I/O modules. IC Role / Device Role / Timing Role: Primary non-isolated boost stage delivering up to 5A at 48V with programmable soft-start and PGOOD monitoring. Use Value: Delivers high efficiency (>94%) across wide load range; RSENSE/DCR flexibility simplifies design for varying thermal constraints. |
| Medical Portable Diagnostic Equipment | Battery-Powered Test & Measurement Instruments |
Use Scenario: Powering 30V analog front-end circuits from a 2S Li-ion battery (6–8.4V). IC Role / Device Role / Timing Role: High-efficiency boost converter with ultra-low 55µA quiescent current to maximize battery life between measurements. Use Value: Extends runtime by >30% vs comparable controllers; ±1% VREF ensures precise sensor excitation voltage stability. | Use Scenario: Providing clean 15V/2A supply for oscilloscope analog signal chain from 12V sealed lead-acid battery. IC Role / Device Role / Timing Role: Low-noise synchronous boost controller operating in pulse-skipping mode to minimize audible noise and RF interference. Use Value: Eliminates switching-frequency modulation artifacts in sensitive analog measurements; PGOOD enables automatic self-test sequencing. |
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#PBF | Same pinout, enhanced current-sense accuracy (±0.5% vs ±1%), lower 35µA IQ, but no AEC-Q100 qualification. | Preferred for precision industrial instrumentation where automotive qualification is unnecessary. | Select LTC3787EMSE#PBF when higher current-sense accuracy and lower IQ outweigh automotive compliance needs. |
| TPS40210DGQ | Non-synchronous controller (external diode), wider 4.5V–52V input, no integrated LDO or PGOOD, 100µA IQ. | Suitable for cost-sensitive, non-automotive applications where efficiency >90% is acceptable and layout space allows diode placement. | Choose TPS40210DGQ only if synchronous FETs are not required and AEC-Q100 is not mandated. |
Compared with LTC3787EMSE#PBF, the LTC3786EMSE#PBF trades minor IQ and sensing accuracy for AEC-Q100 qualification and broader automotive validation; versus TPS40210DGQ, it delivers superior efficiency, integrated gate drive, and functional safety features essential for mission-critical systems.
Availability
LTC3786EMSE#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, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LTC3786EMSE#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 (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 Power by Linear™ family of high-efficiency DC/DC controllers, designed specifically for demanding automotive, industrial, and medical applications requiring wide input range, low IQ, and robust fault protection.
FAQ
What is the maximum output voltage supported by the LTC3786EMSE#PBF?
The LTC3786EMSE#PBF supports output voltages up to 60V, set by the external feedback resistor divider on the VFB pin. Its internal 1.2V reference maintains ±1% regulation accuracy across temperature and line/load conditions, enabling stable high-voltage rails for industrial and automotive subsystems.
Does the LTC3786EMSE#PBF require an external Schottky diode for bootstrap operation?
No - the LTC3786EMSE#PBF integrates a charge pump for the BOOST rail and does not require an external Schottky diode. The BOOST pin is internally driven to enable high-side N-MOSFET gate drive; it must be bypassed to the SW node with a capacitor per the datasheet layout guidelines.
Can the LTC3786EMSE#PBF operate with input voltage below 4.5V?
Yes - after initial startup, the LTC3786EMSE#PBF can operate from as low as 2.5V when biased from its own output or an auxiliary supply. However, the minimum VBIAS for startup remains 4.5V; this extended low-voltage operation supports brownout recovery in automotive and battery-powered systems.
How is light-load efficiency optimized in the LTC3786EMSE#PBF?
The LTC3786EMSE#PBF offers three selectable light-load modes via the PLLIN/MODE pin: Burst Mode® (55µA IQ), pulse-skipping (low ripple), or forced continuous conduction. Burst Mode® maximizes battery runtime by disabling switching until output droop triggers reactivation - confirmed in Figure 8 and G02 performance curves.
Is the LTC3786EMSE#PBF pin-compatible with other members of the LTC378x family?
Yes - the LTC3786EMSE#PBF shares identical pinout and package (MSOP-16) with LTC3787EMSE#PBF and LTC3789EMSE#PBF. However, functional differences exist: LTC3787 adds improved current-sense accuracy and lower IQ, while LTC3789 adds dual-phase interleaving. Always verify feature alignment before substitution.
LTC3786EMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) 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-MSOP-EP
LTC3786EMSE#PBF FAQ
1.How can I place an order for LTC3786EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3786EMSE#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 LTC3786EMSE#PBF reliable?
The price and inventory of LTC3786EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3786EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3786EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3786EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3786EMSE#PBF?
LTC3786EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3786EMSE#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 LTC3786EMSE#PBF?
For technical support, including LTC3786EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3786EMSE#PBF requirements.
6.How does Aetrix verify that LTC3786EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3786EMSE#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 LTC3786EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3786EMSE#PBF?
All LTC3786EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3786EMSE#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 LTC3786EMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3786EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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