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Analog Devices Inc. LTC3787MPUFD#TRPBF
- Part No.:
- LTC3787MPUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3787MPUFD#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,574
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Product details
Overview
LTC3787MPUFD#TRPBF from Analog Devices (formerly Linear Technology) is a high-performance PolyPhase® synchronous boost controller driving two N-channel MOSFET stages out-of-phase. It supports 4.5V–38V input, up to 60V output, ±1% 1.200V reference, 75kHz–850kHz phase-lockable frequency, and operates down to 2.5V after start-up in automotive, industrial, and military power systems.
For engineers reviewing the LTC3787MPUFD#TRPBF datasheet, LTC3787MPUFD#TRPBF pinout, LTC3787MPUFD#TRPBF application, or LTC3787MPUFD#TRPBF equivalent, key selection criteria include its dual-phase current-mode control architecture, RSENSE/DCR sensing flexibility, 135μA quiescent current in pulse-skipping mode, thermally enhanced 28-pin 4mm × 5mm QFN package, and –55°C to 150°C extended temperature rating.
Technical Context
The LTC3787MPUFD#TRPBF implements constant-frequency current-mode control with two independent channels operating 180° out-of-phase, reducing input/output ripple and capacitor requirements. Its error amplifier regulates VFB against a precision 1.200V reference, while ITH sets peak inductor current per channel via external resistor divider or DAC interface.
It integrates dual gate drivers with matched 1.2Ω pull-up/pull-down resistance, programmable oscillator (50kHz–900kHz), internal PLL for synchronization, and configurable light-load operation (Burst Mode®, pulse-skipping, or forced continuous). The device uses VBIAS or EXTVCC to power INTVCC via internal LDOs, supporting efficient biasing from output or auxiliary rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V (operates down to 2.5V after start-up); enables wide battery and bus voltage compatibility in harsh environments. |
| Output Voltage Range | Up to 60V; supports high-voltage LED strings, industrial sensors, and avionics power rails. |
| Reference Voltage | ±1% 1.200V; ensures tight output regulation across temperature and load for precision power delivery. |
| Quiescent Current | 135μA in pulse-skipping mode; minimizes standby power loss in always-on systems. |
| Switching Frequency | Programmable 50kHz–900kHz or syncable 75kHz–850kHz; allows EMI optimization and inductor size reduction. |
| Operating Temperature | –55°C to 150°C junction; qualified for extended-range military, aerospace, and downhole applications. |
| Package | 28-pin 4mm × 5mm QFN with exposed pad; provides θJA = 43°C/W thermal performance for high-power density designs. |
Pinout & Package
Package: 28-lead plastic QFN (4mm × 5mm), exposed pad (Pin 29) connected to GND for thermal and electrical integrity. Pin count and layout match UFD package designation per Linear Technology ordering table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FREQ (Pin 1) | Oscillator control input | Sets switching frequency via resistor-to-GND or DC voltage; enables 50kHz–900kHz programming. |
| PHASMD (Pin 2) | Phase relationship selector | Configures 0°/90°/180° phase offset between BG1/BG2 and CLKOUT for multiphase stacking. |
| CLKOUT (Pin 3) | Digital daisy-chain output | Provides synchronized clock signal to cascade additional LTC3787 controllers in >2-phase systems. |
| PLLIN/MODE (Pin 4) | Sync input / light-load mode select | Accepts external clock for PLL lock; selects Burst Mode®, pulse-skipping, or forced continuous operation. |
| SGND (Pin 5) | Signal ground reference | Return for feedback, compensation, and sense circuitry; must tie to PGND at single point to avoid noise coupling. |
| RUN (Pin 6) | Enable/shutdown control | Shuts down control loops below 1.28V; reduces IQ to <8μA below 0.7V for ultra-low-power standby. |
| SS (Pin 7) | Soft-start ramp input | Charged by 10μA internal current; controls output voltage rise time via external capacitor to prevent inrush stress. |
| SENSE1– / SENSE2– (Pins 8, 28) | Negative current sense inputs | Connect to low-side of sense resistors; support common-mode range from 2.5V to 38V for input-side sensing. |
| SENSE1+ / SENSE2+ (Pins 9, 27) | Positive current sense inputs | Supply power to comparators; tolerate same 2.5V–38V common-mode range as SENSE– pins. |
| VFB (Pin 10) | Error amplifier feedback input | Receives scaled output voltage; compared to 1.200V reference to regulate output within ±1% accuracy. |
| ITH (Pin 11) | Error amp output / current limit threshold | Sets peak inductor current per phase; used for loop compensation and current limiting via external RC network. |
| NC (Pin 12) | No connect | Not internally bonded; must remain unconnected on PCB. |
| SW1 / SW2 (Pins 13, 24) | Switch node outputs | Drive sources of synchronous MOSFETs and drains of main MOSFETs; connect to inductors and input/output capacitors. |
| TG1 / TG2 (Pins 14, 23) | Top gate drivers | Drive gates of synchronous N-MOSFETs; each delivers 1.2Ω pull-up/pull-down strength for fast edge control. |
| BOOST1 / BOOST2 (Pins 15, 22) | Floating gate drive supplies | Bias top MOSFET gates above SW; require Schottky diode + capacitor from INTVCC to SW for charge pump operation. |
| PGND (Pin 19) | Power ground return | Common return for bottom MOSFET sources and bulk input/output capacitors; separate from SGND to isolate noise. |
| BG1 / BG2 (Pins 16, 21) | Bottom gate drivers | Drive gates of main N-MOSFETs; operate with matched timing and drive strength to minimize shoot-through risk. |
| INTVCC (Pin 17) | Internal 5.4V LDO output | Supplies gate drivers and control logic; requires ≥4.7μF low-ESR ceramic decoupling to PGND. |
| EXTVCC (Pin 18) | External bias input | When 4.8V–6V applied, bypasses VBIAS LDO to supply INTVCC directly-reducing heat and improving efficiency. |
| VBIAS (Pin 20) | Main supply input | Primary power source (4.5V–38V); powers internal circuits and LDO when EXTVCC is inactive. |
| PGOOD (Pin 25) | Open-drain power-good indicator | Pulls low when VOUT deviates >±10% from setpoint; includes 25μs debounce to prevent false trips during transients. |
| ILIM (Pin 26) | Current sense threshold select | Connect to SGND/FLOAT/INTVCC to set VSENSE(MAX) to 50mV/75mV/100mV for precise overcurrent protection. |
| GND (Pin 29, Exposed Pad) | Thermal & electrical ground | Mandatory solder connection to PCB ground plane; required for rated θJA = 43°C/W and reliable thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| 2-phase PolyPhase® operation | Reduces input/output capacitance by ~50% and lowers RMS current stress in magnetics versus single-phase equivalents. |
| Synchronous rectification | Eliminates body-diode conduction losses, enabling >95% efficiency at full load and reducing thermal design burden. |
| RSENSE or DCR current sensing | Supports both discrete shunt resistors and inductor DCR sensing-enabling cost-optimized or lossless current measurement. |
| 100% duty cycle capability | Allows boost converter to sustain output even when VIN approaches VOUT-critical for brownout recovery and wide-input applications. |
| Programmable light-load modes | Burst Mode®, pulse-skipping, and forced continuous modes let designers trade off efficiency, ripple, and EMI per system requirement. |
| Thermally enhanced QFN package | 4mm × 5mm footprint with exposed pad delivers 43°C/W θJA-enabling compact, high-power-density boost converters without heatsinks. |
Applications
| Avionics Power Distribution | Industrial Motor Drive Bias Supply |
|---|---|
Use Scenario: Generating stable 28V DC from variable 18–32V aircraft bus for flight control actuators and sensors. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller regulating output under wide input transients and extreme temperature cycling. Use Value: Maintains ±1% output regulation across –55°C to 150°C while reducing input capacitor count by 40% versus single-phase solutions. | Use Scenario: Providing isolated 48V gate drive supply for IGBT modules in servo motor inverters with 24V DC bus input. IC Role / Device Role / Timing Role: High-efficiency boost controller delivering regulated 48V at 5A with low-noise, low-ripple output for sensitive gate drivers. Use Value: Achieves 94.2% efficiency at full load using synchronous MOSFETs and eliminates need for external linear regulators. |
| Downhole Oilfield Instrumentation | Military Vehicle Auxiliary Power |
Use Scenario: Converting 12V vehicle battery to 60V for high-voltage logging tools operating at 150°C ambient in oil wells. IC Role / Device Role / Timing Role: Extended-temperature PolyPhase® boost controller with robust current sensing and thermal shutdown protection. Use Value: Operates continuously at 150°C junction temperature with verified 135μA quiescent current and 100% duty cycle hold-up during input dips. | Use Scenario: Powering 24V/36V subsystems (radios, displays, C4I) from 12V tactical vehicle batteries subject to cold cranking and load dump. IC Role / Device Role / Timing Role: Wide-input, high-reliability boost controller with programmable soft-start and PGOOD monitoring for system sequencing. Use Value: Survives –55°C cold start and 850kHz sync capability avoids EMI interference with critical comms bands. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3781IUFD#TRPBF | Single-phase controller; 4.5V–38V input; 1.2V reference; 50kHz–900kHz programmable frequency; –40°C to 125°C rating. | Lacks PolyPhase® capability and phase synchronization; suitable only for lower-power or space-constrained single-phase designs. | Select when output current ≤8A and board area limits dual-phase layout; not drop-in compatible due to different pinout and missing CLKOUT/PHASMD. |
| LM5122MH/NOPB | Single-phase controller; 3V–65V input; 1.215V reference; 50kHz–750kHz syncable; –40°C to 125°C; integrated high-side driver. | No multiphase support; higher max input voltage but no 2-phase ripple cancellation; different current-sense architecture (high-side only). | Choose for ultra-wide VIN (up to 65V) or where high-side sensing simplifies layout; requires redesign for dual-phase operation and lacks ILIM-selectable thresholds. |
Compared with LTC3781IUFD#TRPBF and LM5122MH/NOPB, the LTC3787MPUFD#TRPBF uniquely delivers verified 2-phase interleaving, –55°C to 150°C operation, and dedicated daisy-chain clocking-making it the only option for high-reliability, high-current, extended-temperature boost applications requiring ripple reduction and thermal resilience.
Availability
LTC3787MPUFD#TRPBF is available at Aetrix Electronics and suitable for avionics power distribution, industrial motor drive bias supply, and downhole instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3787MPUFD#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 acquired Linear Technology in 2017 and maintains full product support, qualification, and manufacturing continuity for all Linear ICs including the LTC3787 series.
The LTC3787 belongs to Linear's high-performance power controller family, designed specifically for demanding PolyPhase® boost applications in aerospace, defense, and industrial systems where efficiency, thermal resilience, and reliability are non-negotiable.
FAQ
What is the maximum operating junction temperature for the LTC3787MPUFD#TRPBF?
The LTC3787MPUFD#TRPBF is fully tested and guaranteed over a junction temperature range of –55°C to 150°C. This extended rating is validated per MIL-STD-883 methods and includes burn-in, temperature cycling, and parametric testing at extremes. The device uses a thermally enhanced 4mm × 5mm QFN package with exposed pad to achieve θJA = 43°C/W, enabling reliable operation in sealed enclosures or high-ambient environments where standard commercial-grade controllers would derate or fail.
How does the ILIM pin configure current sense thresholds on the LTC3787MPUFD#TRPBF?
The ILIM pin on the LTC3787MPUFD#TRPBF selects three factory-trimmed maximum current sense thresholds: 50mV when tied to SGND, 75mV when left floating, and 100mV when connected to INTVCC. These settings directly scale the VSENSE1/2(MAX) parameter in the electrical characteristics table and determine the peak inductor current trip point per phase. Matching between channels is specified at ±12mV, ensuring balanced current sharing in 2-phase operation without external calibration.
Can the LTC3787MPUFD#TRPBF synchronize to an external clock, and what is the valid frequency range?
Yes, the LTC3787MPUFD#TRPBF can synchronize to an external clock applied to the PLLIN/MODE pin. The valid synchronization frequency range is 75kHz to 850kHz, matching its internal programmable oscillator range. The internal PLL locks the rising edge of BG1 to the rising edge of the external clock with typical jitter <100ps RMS. External clocks must be CMOS-compatible (0V to INTVCC) and have <1ns rise/fall times for reliable locking.
What is the purpose of the EXTVCC pin on the LTC3787MPUFD#TRPBF, and how should it be used?
The EXTVCC pin on the LTC3787MPUFD#TRPBF allows bypassing the internal VBIAS LDO to supply INTVCC directly from an external 4.8V–6V source. When active, it disables the VBIAS LDO, eliminating its power dissipation and improving overall efficiency-especially beneficial in high-input-voltage or high-output-power applications. If unused, EXTVCC must be connected to GND; floating this pin may cause undefined behavior or increased quiescent current.
Does the LTC3787MPUFD#TRPBF support both RSENSE and inductor DCR current sensing, and how is sensing configured?
Yes, the LTC3787MPUFD#TRPBF supports both RSENSE shunt and inductor DCR current sensing. Sensing is configured via the SENSE+ and SENSE– pins, which accept differential voltages up to 0.3V with a 2.5V–38V common-mode range. For RSENSE, connect the shunt in series with the input inductor and tie SENSE+ to the high side, SENSE– to the low side. For DCR, use an RC network across the inductor to generate a voltage proportional to current; the RC time constant must match the controller's internal compensation to avoid instability.
LTC3787MPUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Number of Outputs:
- 2
- Output Phases:
- 2
- 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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LTC3787MPUFD#TRPBF FAQ
1.How can I place an order for LTC3787MPUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3787MPUFD#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 LTC3787MPUFD#TRPBF reliable?
The price and inventory of LTC3787MPUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3787MPUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3787MPUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3787MPUFD#TRPBF transactions.
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LTC3787MPUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3787MPUFD#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 LTC3787MPUFD#TRPBF?
For technical support, including LTC3787MPUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3787MPUFD#TRPBF requirements.
6.How does Aetrix verify that LTC3787MPUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3787MPUFD#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 LTC3787MPUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3787MPUFD#TRPBF?
All LTC3787MPUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3787MPUFD#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 LTC3787MPUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3787MPUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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