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Analog Devices Inc. LTC3787EUFD#PBF
- Part No.:
- LTC3787EUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3787EUFD#PBF.pdf
- Description:
- IC REG CTRLR BOOST 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:591
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Product details
Overview
LTC3787EUFD#PBF from Analog Devices (formerly Linear Technology) is a dual-phase synchronous boost controller IC that drives two N-channel MOSFET stages out-of-phase to reduce input/output capacitance and power supply noise. It operates from 4.5V–38V input (down to 2.5V post-startup), delivers up to 60V output, features ±1% 1.200V reference, and supports RSENSE or DCR current sensing - enabling high-efficiency, high-power boost conversion in industrial and automotive power systems.
For engineers reviewing the LTC3787EUFD#PBF datasheet, LTC3787EUFD#PBF pinout, LTC3787EUFD#PBF application, or LTC3787EUFD#PBF equivalent, key selection considerations include its 2-phase PolyPhase® architecture, programmable 50kHz–900kHz switching frequency, 100% duty cycle capability, low 135μA quiescent current, and thermally enhanced 4mm × 5mm QFN package with exposed ground pad.
Technical Context
The LTC3787EUFD#PBF implements constant-frequency current-mode control with two independent, phase-shifted channels. Each channel uses an internal error amplifier (transconductance gm = 2 mmho) comparing VFB to a precise 1.200V reference, and regulates peak inductor current via the ITH pin voltage. The controller supports three light-load modes-Burst Mode®, pulse-skipping, and forced continuous-selected via the PLLIN/MODE pin.
Its integrated 5.4V LDO powers gate drivers from either VBIAS (4.5V–38V) or EXTVCC (4.8V–6V), with automatic switchover and 0.5–2% load regulation. The FREQ pin enables resistor-programmed operation from 50kHz to 900kHz, while PLLIN/MODE allows synchronization to external clocks from 75kHz to 850kHz with phase-locking capability.
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 transient-tolerant industrial supplies. |
| Output Voltage Range | Up to 60V; enables high-voltage bus generation from 12V/24V inputs in automotive and industrial systems. |
| Reference Voltage Accuracy | ±1% at 1.200V; ensures tight output regulation across temperature and load for precision power rails. |
| Quiescent Current | 135μA in pulse-skipping/forced continuous mode; minimizes standby power loss in always-on applications. |
| Switching Frequency Range | 50kHz to 900kHz (programmable) or 75kHz to 850kHz (PLL-synchronized); balances efficiency, size, and EMI performance. |
| Current Sense Options | RSENSE or inductor DCR sensing; eliminates need for dedicated sense resistors, reducing BOM cost and conduction losses. |
| Package Thermal Resistance | θJA = 43°C/W (QFN UFD); enables high-power density designs without forced airflow in compact enclosures. |
Pinout & Package
Package: 28-lead (4mm × 5mm) plastic QFN with exposed ground pad (Pin 29), rated for –40°C to 125°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FREQ (Pin 1) | Oscillator frequency control | Resistor-to-GND sets 50kHz–900kHz; DC voltage or INTVCC/GND selects fixed frequencies (350kHz/535kHz). |
| PLLIN/MODE (Pin 4) | Light-load mode selection & sync input | GND = Burst Mode®; INTVCC = forced continuous; 1.2V–(INTVCC–1.3V) = pulse-skipping; external clock = PLL sync. |
| SENSE1+/SENSE1– (Pins 2,3) | Channel 1 current sense differential input | Accepts 2.5V–38V common-mode range; supports RSENSE or DCR sensing with ±12mV matching between channels. |
| VFB (Pin 10) | Error amplifier feedback input | Compares output divider voltage to 1.200V reference; ±5nA input bias enables high-impedance feedback networks. |
| ITH (Pin 11) | Error amplifier output & current limit threshold | Directly sets peak inductor current; voltage range determines overcurrent trip point per phase. |
| PGOOD (Pin 25) | Open-drain power-good indicator | Asserts low when VOUT deviates >±10% from regulation; 25μs delay prevents false triggering during transients. |
| PGND (Pin 19) | Driver power ground | Must be connected to source of bottom MOSFETs and negative terminals of input/output capacitors for stable gate drive. |
| Exposed Pad (Pin 29) | Thermal & electrical ground | Required solder connection to PCB ground plane; critical for achieving θJA = 43°C/W and reliable thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| PolyPhase® 2-phase operation | Reduces RMS input/output capacitor ripple current by ~70% vs single-phase, enabling smaller, lower-cost bulk capacitance. |
| Synchronous rectification support | Drives both top and bottom N-MOSFETs per phase with matched 70ns dead-time control, eliminating body-diode conduction losses. |
| 100% duty cycle capability | Allows seamless transition to dropout conditions (e.g., VIN ≈ VOUT), maintaining regulation during brownouts or cold-crank events. |
| Low IQ shutdown mode | Draws <8μA when RUN pin <0.7V, enabling ultra-low-power system sleep states without external disconnect circuitry. |
| Programmable current sense threshold | ILIM pin selects 50mV/75mV/100mV max sense voltage, optimizing trade-off between accuracy and conduction loss across load ranges. |
| Integrated 5.4V LDO with EXTVCC switchover | Reduces thermal stress on VBIAS LDO by sourcing INTVCC from auxiliary 4.8V–6V supply, improving overall system efficiency. |
Applications
| Automotive 12V–24V Boost Converter | Industrial Programmable Logic Controller (PLC) Power Supply |
|---|---|
Use Scenario: Generating stable 24V rail from vehicle battery (9V–16V) during cold-crank or load-dump transients. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller managing two parallel power stages with out-of-phase switching to suppress EMI and minimize input capacitor stress. Use Value: Maintains regulation down to 2.5V input post-startup and delivers 10A at 24V with >94% efficiency at full load, meeting automotive AS5653 EMC requirements. |
Use Scenario: Providing isolated 48V auxiliary power for I/O modules in modular PLC backplanes with wide ambient temperature range. IC Role / Device Role / Timing Role: High-reliability boost controller operating in forced continuous mode to ensure zero-output-ripple timing-critical logic supplies. Use Value: ±1% reference accuracy and <0.1% load regulation enable precise analog sensor excitation and ADC reference stability across –40°C to 125°C. |
| Medical Imaging System HV Bias Supply | Military Radar Transmitter Power Stage |
Use Scenario: Generating low-noise 60V bias for photomultiplier tubes (PMTs) in portable ultrasound and X-ray detectors. IC Role / Device Role / Timing Role: Precision boost controller using DCR current sensing to eliminate sense resistor thermal drift, paired with soft-start (SS pin) for controlled ramp-up. Use Value: 135μA quiescent current and Burst Mode® operation extend battery life in handheld devices; 2.5V–38V input range accommodates diverse battery packs. |
Use Scenario: Driving GaN-based RF power amplifiers requiring tightly regulated 48V supply with rapid transient response under pulsed radar loads. IC Role / Device Role / Timing Role: Phase-locked PolyPhase® controller synchronized to system clock (via PLLIN/MODE) to minimize beat-frequency interference in sensitive RF front-ends. Use Value: 75kHz–850kHz PLL sync range aligns switching harmonics away from critical RF bands; 43°C/W θJA enables conduction-cooled chassis mounting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3781EUFD#PBF | Single-phase architecture; 4.5V–38V input; 60V output; no PLL sync; 200μA IQ | Lacks 2-phase current sharing and phase-locking; suitable only for lower-current (<5A) or space-constrained designs | Select when board area is critical and output current ≤5A; avoid for high-efficiency multi-kW systems. |
| LM5122MMX/NOPB | Single-phase; 3V–65V input; 100V output; 100kHz–1MHz freq; no DCR sensing; 2.5mA IQ | Wider VIN range but higher quiescent current; lacks PolyPhase® and precise 1.200V reference (±1.5%) | Prefer for ultra-wide-input (e.g., 3V LiSOCl₂ batteries) or >60V output needs; not drop-in for LTC3787's low-IQ or precision apps. |
Compared with LTC3781EUFD#PBF and LM5122MMX/NOPB, the LTC3787EUFD#PBF uniquely combines dual-phase operation, PLL synchronization, sub-200μA quiescent current, and ±1% reference accuracy - making it the only option for high-efficiency, low-noise, high-current boost in thermally constrained industrial and automotive environments.
Availability
LTC3787EUFD#PBF is available at Aetrix Electronics and suitable for industrial programmable logic controllers, automotive ADAS power supplies, medical imaging bias generators, and military radar transmitter stages requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3787EUFD#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for all Linear ICs including the LTC3787EUFD#PBF.
The LTC3787EUFD#PBF belongs to Linear's high-performance PolyPhase® controller family, designed specifically for high-efficiency, high-current DC/DC boost conversion in demanding industrial, automotive, and medical applications where thermal performance and precision regulation are critical.
FAQ
What is the maximum output voltage supported by the LTC3787EUFD#PBF?
The LTC3787EUFD#PBF supports output voltages up to 60V. This is enabled by its robust 70V absolute maximum rating on SW1/SW2 pins and 76V rating on BOOST1/BOOST2 pins, allowing safe operation with high-side MOSFETs in boost configurations delivering 48V or 60V rails. Output voltage is set externally via the VFB resistive divider.
Does the LTC3787EUFD#PBF support DCR current sensing, and how is it configured?
Yes, the LTC3787EUFD#PBF supports both RSENSE and inductor DCR current sensing. DCR sensing is implemented using the SENSE1+/SENSE1– and SENSE2+/SENSE2– differential inputs, which accept a common-mode voltage range of 2.5V to 38V. No additional components are required beyond the DCR network and RC filter on the sense lines.
What is the purpose of the ILIM pin on the LTC3787EUFD#PBF, and what values does it set?
The ILIM pin on the LTC3787EUFD#PBF selects the maximum current sense threshold voltage: tying ILIM to GND sets 50mV, floating sets 75mV, and connecting to INTVCC sets 100mV. This adjusts the peak inductor current trip point per phase, allowing optimization of current-sense signal-to-noise ratio versus conduction loss across different MOSFET RDS(on) and inductor DCR values.
How does the LTC3787EUFD#PBF achieve thermal performance in its QFN package?
The LTC3787EUFD#PBF achieves θJA = 43°C/W in its 4mm × 5mm QFN (UFD) package through mandatory soldering of the exposed pad (Pin 29) to a large PCB ground plane. This pad serves as both thermal dissipation path and electrical ground reference for PGND and driver circuits, enabling reliable operation at full load in ambient temperatures up to 125°C.
Can the LTC3787EUFD#PBF operate with an input voltage below 4.5V, and under what conditions?
Yes, the LTC3787EUFD#PBF can operate with input voltage as low as 2.5V after startup, provided it is biased from the output (VBIAS = VOUT) or an auxiliary supply. During initial startup, however, the minimum VBIAS remains 4.5V to ensure proper internal LDO regulation and gate driver functionality before transitioning to low-VIN operation.
LTC3787EUFD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- 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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LTC3787EUFD#PBF FAQ
1.How can I place an order for LTC3787EUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3787EUFD#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 LTC3787EUFD#PBF reliable?
The price and inventory of LTC3787EUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3787EUFD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3787EUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3787EUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3787EUFD#PBF?
LTC3787EUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3787EUFD#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 LTC3787EUFD#PBF?
For technical support, including LTC3787EUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3787EUFD#PBF requirements.
6.How does Aetrix verify that LTC3787EUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3787EUFD#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 LTC3787EUFD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3787EUFD#PBF?
All LTC3787EUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3787EUFD#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 LTC3787EUFD#PBF part is unused and in its original packaging.
Return procedure for LTC3787EUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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