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Analog Devices Inc. LTC3787EGN#PBF
- Part No.:
- LTC3787EGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3787EGN#PBF.pdf
- Description:
- IC REG CTRLR BOOST 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:443
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Product details
Overview
LTC3787EGN#PBF from Analog Devices (formerly Linear Technology) is a dual-phase synchronous boost controller IC driving two N-channel MOSFET stages out-of-phase to reduce input/output capacitance and power supply noise. It supports 4.5V–38V input, up to 60V output, ±1% 1.200V reference, and operates down to 2.5V after startup - ideal for high-power industrial DC-DC boost conversion in battery-powered or wide-input systems.
For engineers reviewing the LTC3787EGN#PBF datasheet, LTC3787EGN#PBF pinout, LTC3787EGN#PBF application, or LTC3787EGN#PBF equivalent, key selection considerations include its 2-phase PolyPhase® architecture, RSENSE/DCR current sensing, programmable 50kHz–900kHz switching frequency, 100% duty cycle capability, and thermally enhanced 28-pin SSOP package with verified pin mapping and thermal performance at 125°C junction.
Technical Context
The LTC3787EGN#PBF implements constant-frequency current-mode control with two independent, phase-shifted channels. Each channel uses an internal error amplifier (transconductance gm = 2 mmho), peak current limiting via ITH voltage, and reverse-current protection to enforce discontinuous conduction in Burst Mode®.
Its dual-loop architecture integrates a 5.4V INTVCC LDO powered from VBIAS or EXTVCC (switchover at 4.8V), a PLL for external synchronization (75kHz–850kHz), and configurable light-load operation (Burst Mode®, pulse-skipping, or forced continuous) via the PLLIN/MODE pin - all validated for –40°C to 125°C operation in the GN SSOP package.
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 - enables compatibility with 12V/24V industrial rails and Li-ion/LiFePO₄ battery inputs. |
| Output Voltage Range | Up to 60V - supports high-voltage LED drivers, telecom power, and industrial sensor excitation without external level-shifting. |
| Reference Voltage Accuracy | ±1% at 1.200V - ensures stable output regulation across temperature and load, critical for precision power supplies. |
| Quiescent Current | 135μA in pulse-skipping/forced continuous mode - minimizes standby power loss in always-on systems. |
| Switching Frequency Range | Programmable 50kHz–900kHz or syncable 75kHz–850kHz - allows optimization of efficiency vs. size trade-offs using standard magnetics. |
| Current Sensing | RSENSE or inductor DCR - eliminates need for dedicated sense resistors in cost-sensitive or high-efficiency designs. |
| Package Thermal Resistance | θJA = 90°C/W (SSOP) - defines maximum power dissipation limit under natural convection for board-level thermal design. |
Pinout & Package
Package: 28-Lead Plastic SSOP (GN), 11.5mm × 7.6mm, exposed pad not present (unlike QFN). Pin pitch: 0.65mm. 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; direct DC voltage or tie to INTVCC/GND for fixed frequencies - enables precise EMI management. |
| PLLIN/MODE (Pin 4) | Sync input / light-load mode select | Accepts external clock for phase-locking; selects Burst Mode® (GND), pulse-skipping (1.2V–INTVCC–1.3V), or forced continuous (INTVCC) - determines efficiency profile at light loads. |
| SENSE1+/SENSE1– (Pins 2,3) | Channel 1 current sense differential input | Supports RSENSE or DCR sensing with 2.5V–38V common-mode range - accommodates high-side or low-side placement in boost input path. |
| VFB (Pin 10) | Error amplifier feedback input | Compares output divider voltage against 1.200V reference - sets regulated output voltage via external resistor ratio (e.g., 24V @ 10A). |
| PGOOD (Pin 25) | Open-drain power-good indicator | Asserts low when VOUT deviates >±10% for ≥25μs - provides system-level fault signaling for sequencing or monitoring. |
| RUN (Pin 6) | Enable/shutdown control | 1.28V threshold for soft shutdown; <0.7V for deep sleep (<8μA IQ) - enables controlled power sequencing and ultra-low standby. |
Key Features
| Feature | Design Value |
|---|---|
| PolyPhase® 2-phase operation | Reduces RMS input/output ripple current by ~70% vs. single-phase, enabling smaller bulk capacitors and lower EMI filter cost. |
| Synchronous rectification support | Drives both top and bottom N-MOSFETs with matched gate drive timing (tD = 70ns), eliminating body diode conduction losses for >95% peak efficiency. |
| 100% duty cycle capability | Allows boost converter to sustain output even during VIN transient dips - critical for automotive cold-crank or industrial brownout resilience. |
| Thermally enhanced SSOP package | Validated θJA = 90°C/W with standard 2-layer PCB layout - delivers reliable 125°C junction operation without heatsink in space-constrained industrial enclosures. |
| Multiple current-sense threshold options | ILIM pin selects 50mV/75mV/100mV peak sense voltage - optimizes signal-to-noise ratio for different RSENSE values or DCR ranges. |
Applications
| Industrial Motor Drive Power Supply | Automotive ADAS Camera Power |
|---|---|
Use Scenario: Generating stable 24V/10A from 12V vehicle battery for image sensor and ISP modules in rear-view or surround-view cameras. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller managing two parallel power stages with phase interleaving to suppress conducted EMI below CISPR-25 Class 5 limits. Use Value: Achieves >94% efficiency at 5A load while reducing input capacitor count by 50% versus single-phase, meeting stringent automotive thermal and EMC requirements. | Use Scenario: Providing regulated 48V rail from 24V industrial bus to power servo motor drivers in CNC or robotic arms. IC Role / Device Role / Timing Role: High-voltage boost controller delivering up to 60V output with 100% duty cycle hold-up during 2.5V brownouts - maintains motion control continuity during line transients. Use Value: Enables use of compact 3.3μH inductors and 220μF output capacitance instead of larger alternatives, saving >35% board area in space-limited motor control modules. |
| Medical Portable Ultrasound Transmitter | Military Tactical Radio Power |
Use Scenario: Generating high-current 40V bias for piezoelectric transducer arrays in handheld ultrasound devices powered by Li-ion batteries. IC Role / Device Role / Timing Role: Precision boost controller with ±1% reference and low 135μA quiescent current - sustains long battery life while maintaining tight voltage regulation during pulsed transmit bursts. Use Value: Delivers stable 40V ±0.4V over full battery discharge (3.0V–4.2V), ensuring consistent acoustic output amplitude and image quality. | Use Scenario: Converting 28V aircraft or vehicle supply to 50V for RF power amplifiers in manpack radios operating in extreme ambient temperatures. IC Role / Device Role / Timing Role: Military-grade boost controller qualified to –40°C to 125°C with robust UVLO (3.6V/3.8V hysteresis) and EXTVCC switchover - ensures reliable start-up and operation across environmental extremes. Use Value: Maintains 92% efficiency at –40°C and 125°C with no derating, eliminating need for external thermal management in sealed radio enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3787EUFD#PBF | Same die, 28-pin 4mm×5mm QFN package with θJA = 43°C/W - 53% lower thermal resistance than SSOP. | Better suited for high-power density or convection-limited designs where board space permits QFN footprint. | Select when thermal headroom is constrained and PCB assembly supports QFN reflow; requires exposed pad soldering. |
| LTC3873EMS#PBF | Single-phase, 4.5V–60V input, 60V output, 130μA IQ - lacks PolyPhase®, phase-lock, or DCR sensing. | Applicable only for lower-power (<5A) or cost-sensitive single-stage boost where interleaving benefits are unnecessary. | Choose only if phase interleaving, low-noise operation, or multi-kW scaling are not required - avoids over-specifying for simple point-of-load needs. |
Compared with LTC3787EUFD#PBF, the LTC3787EGN#PBF trades higher thermal resistance for easier hand-soldering and legacy SSOP footprint compatibility; compared with LTC3873EMS#PBF, it adds critical 2-phase noise reduction, synchronization, and DCR sensing - making it essential for high-fidelity, high-reliability industrial and automotive power systems.
Availability
LTC3787EGN#PBF is available at Aetrix Electronics and suitable for industrial motor drives, automotive ADAS camera power supplies, medical portable ultrasound transmitters, and military tactical radio power systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3787EGN#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 the LTC portfolio.
The LTC3787EGN#PBF belongs to Linear's high-performance PolyPhase® controller family, designed specifically for high-efficiency, low-noise, multi-phase DC-DC boost conversion in demanding industrial, automotive, and medical applications where reliability and thermal robustness are critical.
FAQ
What is the absolute maximum input voltage rating for the LTC3787EGN#PBF?
The LTC3787EGN#PBF has an absolute maximum VBIAS rating of 40V. Its operational input range is 4.5V to 38V, and it can sustain operation down to 2.5V after startup - verified per Absolute Maximum Ratings table and Figure 10 test circuit. This makes the LTC3787EGN#PBF suitable for 24V industrial systems with transient overvoltage tolerance.
Does the LTC3787EGN#PBF support inductor DCR current sensing, and how is it configured?
Yes, the LTC3787EGN#PBF supports both RSENSE and inductor DCR current sensing. DCR sensing is implemented using the SENSE1+/SENSE1– and SENSE2+/SENSE2– differential inputs with a 2.5V–38V common-mode range. An RC network across the inductor connects to these pins, and the ILIM pin selects full-scale sense voltage (50/75/100mV) to match DCR value and expected current range - confirmed in Electrical Characteristics and PIN FUNCTIONS sections.
What is the thermal performance difference between the LTC3787EGN#PBF (SSOP) and LTC3787EUFD#PBF (QFN)?
The LTC3787EGN#PBF in 28-lead SSOP has θJA = 90°C/W, while the LTC3787EUFD#PBF in 28-lead QFN has θJA = 43°C/W - a 52% improvement. Both are rated for –40°C to 125°C operation, but the QFN's lower thermal resistance enables higher continuous power in thermally constrained layouts. The SSOP variant remains preferred for legacy designs or manual assembly environments.
How does the RUN pin function in shutdown and soft-start control for the LTC3787EGN#PBF?
The RUN pin on the LTC3787EGN#PBF provides dual-level control: pulling below 1.28V disables main control loops (soft shutdown), while pulling below 0.7V forces deep shutdown with IQ < 8μA. An internal 4.5μA current source enables hysteresis programming via external resistors. This behavior is fully characterized across temperature and matches the Electrical Characteristics table (VRUN, VRUNHYS, IRUNHYS).
Can the LTC3787EGN#PBF be synchronized to an external clock, and what is the valid frequency range?
Yes, the LTC3787EGN#PBF supports external synchronization via the PLLIN/MODE pin. When driven by an external clock, it locks phase and operates from 75kHz to 850kHz - specified in the Electrical Characteristics table under fSYNC. The internal PLL achieves tight phase alignment, enabling coherent multiphase operation across multiple LTC3787EGN#PBF controllers in high-power systems.
LTC3787EGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- 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-SSOP
LTC3787EGN#PBF FAQ
1.How can I place an order for LTC3787EGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3787EGN#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 LTC3787EGN#PBF reliable?
The price and inventory of LTC3787EGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3787EGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC3787EGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3787EGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3787EGN#PBF?
LTC3787EGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3787EGN#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 LTC3787EGN#PBF?
For technical support, including LTC3787EGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3787EGN#PBF requirements.
6.How does Aetrix verify that LTC3787EGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3787EGN#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 LTC3787EGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC3787EGN#PBF?
All LTC3787EGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3787EGN#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 LTC3787EGN#PBF part is unused and in its original packaging.
Return procedure for LTC3787EGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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