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Analog Devices Inc. LTC3786IMSE#PBF
- Part No.:
- LTC3786IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3786IMSE#PBF.pdf
- Description:
- IC REG CTRLR MULT TOP 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:622
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Product details
Overview
LTC3786IMSE#PBF 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 requiring stable high-voltage rail generation from low-battery inputs.
For engineers reviewing the LTC3786IMSE#PBF datasheet, LTC3786IMSE#PBF pinout, LTC3786IMSE#PBF application, or LTC3786IMSE#PBF equivalent, key selection criteria include verified 75kHz–850kHz PLL synchronization range, RSENSE/DCR current sensing flexibility, programmable soft-start via SS pin, and AEC-Q100 qualification for automotive-grade thermal and reliability validation.
Technical Context
The LTC3786IMSE#PBF implements constant-frequency current-mode control with an internal error amplifier (2mmho transconductance), precision 1.2V reference (±1% over temperature), and dual-mode light-load operation selected via PLLIN/MODE pin - supporting Burst Mode® (55µA IQ), 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) with ±2% load regulation, supports 2.5V post-startup operation when biased from output or auxiliary supply, and features a phase-locked loop enabling synchronization to external clocks while maintaining tight frequency tolerance (±5% typical across 75–850kHz).
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 when biased externally - enables compatibility with 12V/24V automotive batteries including cranking dips. |
| Output Voltage Range | Up to 60V; set via external resistive divider at VFB - supports high-side biasing for gate drivers or industrial sensor rails. |
| Quiescent Current | 55µA in no-load operation; <8µA in shutdown - extends runtime in battery-backed systems like telematics or ADAS modules. |
| Reference Voltage | 1.200V ±1% over –40°C to 125°C - ensures accurate output regulation across automotive temperature extremes. |
| Switching Frequency | Programmable 50kHz–900kHz or PLL-synchronized 75kHz–850kHz - balances efficiency (low f) vs. size (high f) in space-constrained ECUs. |
| Current Sensing | RSENSE or inductor DCR sensing; max sense threshold 75mV (typ) - allows low-loss, high-accuracy current monitoring without added power loss. |
| Package | 16-pin MSOP (3mm × 3mm), exposed pad grounded - provides θJA = 40°C/W for reliable thermal performance in dense PCB layouts. |
Pinout & Package
Package: 16-Lead Plastic MSOP (MSE), thermally enhanced with exposed GND pad (Pin 17). Requires soldering of exposed pad to PCB for rated thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB (Pin 1) | Error amplifier feedback input | Connects to resistor divider across VOUT; regulates output by comparing to 1.2V internal reference - determines final output voltage accuracy. |
| SENSE+ / SENSE– (Pins 2/3) | Current sense comparator inputs | Accept differential voltage across sense resistor or DCR; common-mode range 2.5V–38V - enables high-side or low-side sensing in buck-boost-derived topologies. |
| ITH (Pin 4) | Error amplifier output & current limit threshold | Sets peak inductor current; also used for loop compensation - direct interface for Type II/III compensation networks. |
| SS (Pin 5) | Soft-start ramp control | Internal 10µA current charges external capacitor to linearly ramp VOUT - prevents inrush current during cold crank or power-up. |
| PLLIN/MODE (Pin 6) | Light-load mode select & sync input | GND = Burst Mode®; INTVCC = forced CCM; 1.2V–(INTVCC–1.3V) = pulse-skipping - enables dynamic efficiency optimization per system load profile. |
| FREQ (Pin 7) | Oscillator programming | Resistor-to-GND sets frequency (50–900kHz); voltage bias or tie to INTVCC/GND selects fixed points - eliminates need for external clock generator in cost-sensitive designs. |
| RUN (Pin 8) | Enable/shutdown control | 1.28V threshold with 100mV hysteresis; <0.7V = ultra-low-IQ shutdown (<8µA) - supports controlled power sequencing in multi-rail systems. |
| GND (Pins 9 & 17) | Power and signal ground | Exposed pad (Pin 17) must be soldered to PCB plane - primary thermal path and low-impedance return for high di/dt switching currents. |
| BG (Pin 10) | Bottom gate driver output | Drives source-connected N-MOSFET; 1.2Ω pull-up/pull-down - optimized for fast turn-on/turn-off with minimal shoot-through risk. |
| INTVCC (Pin 11) | Internal 5.4V LDO output | Supplies gate drivers and logic; requires ≥4.7µF ceramic decoupling - eliminates need for external bias rail in most applications. |
| VBIAS (Pin 12) | Main supply input | Accepts 4.5V–38V; powers internal circuits and enables operation below VIN - supports bootstrap or output-bias configurations for extended input range. |
| BOOST (Pin 13) | Floating supply for top gate | Charged via charge pump from INTVCC; bypassed to SW - enables high-side N-MOSFET drive without external bootstrap components. |
| TG (Pin 14) | Top gate driver output | Drives gate of synchronous N-MOSFET; matched timing to BG with 80ns dead-time - ensures robust 100% duty cycle capability. |
| SW (Pin 15) | Switch node | Connects to inductor, bottom MOSFET source, and top MOSFET drain - high dv/dt node requiring careful layout and Kelvin sensing. |
| PGOOD (Pin 16) | Open-drain power-good indicator | Asserts low when VOUT deviates >±10%; 25µs delay - provides system-level fault signaling for microcontroller monitoring or sequencing logic. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Rated for –40°C to 125°C junction temperature with automotive reliability testing - meets functional safety requirements for ASIL-B capable systems. |
| 100% duty cycle support | Enables seamless transition to dropout condition (VIN ≈ VOUT) without discontinuity - critical for start-stop battery recovery where input may dip near output voltage. |
| Three selectable light-load modes | Burst Mode® (55µA IQ), pulse-skipping, or forced CCM - allows trade-off between efficiency, ripple, and EMI in real-time based on system state. |
| Integrated 5.4V LDO | Powers internal circuitry and gate drivers from VBIAS - eliminates external bias supply, reducing BOM count and board area in compact modules. |
| Phase-lockable oscillator | Synchronizes to external clock (75–850kHz) with jitter <1%, enabling deterministic EMI reduction in multi-converter systems - essential for radar and infotainment subsystems. |
Applications
| Automotive Start-Stop Systems | Industrial High-Voltage Sensors |
|---|---|
Use Scenario: Maintains stable 24V rail during engine cranking when battery voltage drops to 6V. IC Role / Device Role / Timing Role: Synchronous boost controller regulating output using VFB feedback and ITH-based current limiting. Use Value: 100% duty cycle capability sustains output during deep undervoltage events; 55µA IQ preserves battery life during prolonged idle states. | Use Scenario: Powers isolated analog front-ends requiring precise 48V bias in factory automation equipment. IC Role / Device Role / Timing Role: Fixed-frequency current-mode boost controller with programmable soft-start and PGOOD monitoring. Use Value: ±1% 1.2V reference ensures <±0.5% output regulation; RSENSE/DCR sensing enables accurate current limiting for fault-tolerant sensor interfaces. |
| Medical Portable Imaging | Telecom Remote Radio Units |
Use Scenario: Generates 52V for CCD/CMOS image sensor bias from 12V Li-ion battery pack. IC Role / Device Role / Timing Role: High-efficiency synchronous boost controller with Burst Mode® for standby power minimization. Use Value: 55µA no-load IQ extends portable device runtime; AEC-Q100 qualification validates robustness against mechanical shock/vibration. | Use Scenario: Supplies 48V PoE++ auxiliary rail in outdoor small-cell base stations operating from 24V DC plant. IC Role / Device Role / Timing Role: PLL-synchronized boost controller sharing clock with RF transceiver to suppress beat frequencies. Use Value: 75–850kHz synchronization range aligns switching harmonics away from sensitive RF bands; MSOP package enables compact thermal design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3787IMSE#PBF | Same pinout, adds dual-phase interleaving and higher 1MHz max frequency; 60µA IQ. | Required for >10A output or lower ripple; not drop-in due to added SYNC/PHASE pins and different MODE logic. | Select LTC3787IMSE#PBF only when interleaved operation or >900kHz switching is needed; otherwise LTC3786IMSE#PBF offers simpler layout and lower cost. |
| TPS40210DGQR | Non-synchronous controller; external Schottky required; 1.25V ref (±2%); no PLL sync; 100µA IQ. | Lower efficiency at high current; unsuitable for automotive temp range (–40°C to 105°C only); no AEC-Q100 rating. | Choose TPS40210DGQR only for cost-sensitive non-automotive applications where 55µA IQ and 100% duty cycle are not required. |
Compared with LTC3787IMSE#PBF, the LTC3786IMSE#PBF delivers identical thermal performance and AEC-Q100 compliance in a simpler single-phase configuration, while TPS40210DGQR lacks the low-IQ operation, synchronization, and automotive qualification essential for modern vehicle electronics - making LTC3786IMSE#PBF the optimal balance of efficiency, integration, and qualification for mid-power boost applications.
Availability
LTC3786IMSE#PBF is available at Aetrix Electronics and suitable for automotive start-stop systems, industrial high-voltage sensors, medical portable imaging, and telecom remote radio units requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3786IMSE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3786IMSE#PBF belongs to Analog Devices' Power by Linear™ synchronous controller family, designed specifically for high-efficiency, wide-input-range DC/DC conversion in thermally constrained and reliability-critical automotive and industrial environments.
FAQ
What is the minimum input voltage for LTC3786IMSE#PBF after startup?
The LTC3786IMSE#PBF can operate from as low as 2.5V after startup when biased from its output or an auxiliary supply - enabling continued regulation during severe automotive battery droop events such as engine cranking, provided the VBIAS pin is not tied directly to the collapsing input rail.
Does LTC3786IMSE#PBF support both RSENSE and inductor DCR current sensing?
Yes, the LTC3786IMSE#PBF supports both methods: SENSE+ and SENSE– accept differential voltage from either a discrete sense resistor or the voltage drop across inductor DCR - providing design flexibility to optimize for accuracy, power loss, or cost without changing the controller IC.
What is the purpose of the PLLIN/MODE pin on LTC3786IMSE#PBF?
The PLLIN/MODE pin on LTC3786IMSE#PBF serves dual functions: it selects light-load operation mode (Burst Mode®, pulse-skipping, or forced CCM) and acts as the phase detector input for external clock synchronization - allowing dynamic efficiency optimization and deterministic EMI control in noise-sensitive systems.
Is LTC3786IMSE#PBF qualified for automotive applications?
Yes, the LTC3786IMSE#PBF is AEC-Q100 qualified for automotive applications (Grade I, –40°C to +125°C), with full reliability testing including HTOL, TC, UHAST, and ESD - making it suitable for use in engine control units, ADAS modules, and body electronics where long-term reliability under harsh conditions is mandatory.
How is soft-start implemented on LTC3786IMSE#PBF?
Soft-start on LTC3786IMSE#PBF is implemented via the SS pin: an internal 10µA current charges an external capacitor to ground, generating a linear 0V–1.2V ramp; the controller regulates VFB to this ramp voltage instead of the fixed 1.2V reference - ensuring monotonic, inrush-limited VOUT rise during power-up.
LTC3786IMSE#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
LTC3786IMSE#PBF FAQ
1.How can I place an order for LTC3786IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3786IMSE#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 LTC3786IMSE#PBF reliable?
The price and inventory of LTC3786IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3786IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3786IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3786IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3786IMSE#PBF?
LTC3786IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3786IMSE#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 LTC3786IMSE#PBF?
For technical support, including LTC3786IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3786IMSE#PBF requirements.
6.How does Aetrix verify that LTC3786IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3786IMSE#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 LTC3786IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3786IMSE#PBF?
All LTC3786IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3786IMSE#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 LTC3786IMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3786IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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