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Analog Devices Inc. LTC3787IGN#PBF
- Part No.:
- LTC3787IGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3787IGN#PBF.pdf
- Description:
- IC REG CTRLR BOOST 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:338
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Product details
Overview
LTC3787IGN#PBF from Analog Devices (formerly Linear Technology) is a dual-phase synchronous boost controller IC designed for high-efficiency, high-power DC/DC conversion. It drives two N-channel MOSFET stages out-of-phase, supports input voltages from 4.5V to 38V (operating down to 2.5V post-startup), delivers up to 60V output, and features ±1% 1.200V reference accuracy. It is used in industrial power supplies requiring reduced input/output capacitance and low-noise operation.
For engineers reviewing the LTC3787IGN#PBF datasheet, LTC3787IGN#PBF pinout, LTC3787IGN#PBF application, or LTC3787IGN#PBF equivalent, key selection criteria include its 2-phase PolyPhase® architecture, programmable 50kHz–900kHz switching frequency, RSENSE/DCR current sensing, 100% duty cycle capability, and thermally enhanced 28-pin SSOP package with –40°C to 125°C operating range.
Technical Context
The LTC3787IGN#PBF implements constant-frequency current-mode control with two independent, phase-shifted channels. Its error amplifier compares VFB against a precision 1.200V internal reference, modulating ITH voltage to regulate peak inductor current per phase. The integrated PLL enables synchronization across multiple controllers or to external clocks (75kHz–850kHz).
It supports three light-load modes via PLLIN/MODE: Burst Mode® (ultra-low IQ = 135μA), pulse-skipping, or forced continuous conduction. Gate drivers feature matched rise/fall times (20ns), 1.2Ω pull-up/pull-down resistance, and 70ns dead-time control. Internal 5.4V LDO powers logic and drivers from VBIAS or EXTVCC (switchover at 4.8V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V supply; operates down to 2.5V after startup - enables wide battery and bus voltage compatibility. |
| Output Voltage Range | Up to 60V - supports high-voltage industrial and medical loads without external level-shifting. |
| Reference Accuracy | ±1% at 1.200V - ensures tight output regulation across temperature and line/load variations. |
| Quiescent Current | 135μA in Burst Mode - minimizes standby power loss in always-on systems. |
| Switching Frequency | Programmable 50kHz–900kHz or syncable 75kHz–850kHz - balances efficiency, size, and EMI requirements. |
| Current Sensing | RSENSE or inductor DCR - eliminates sense resistor losses or enables cost-effective layout with existing magnetics. |
| Duty Cycle | 100% capability for synchronous MOSFET - allows dropout operation near VIN ≈ VOUT for extended low-input scenarios. |
Pinout & Package
Package: 28-Lead Plastic SSOP (GN), thermally rated for –40°C to 125°C junction temperature (θJA = 90°C/W). Exposed pad not present; standard SSOP thermal path relies on PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FREQ (Pin 1) | Oscillator programming input | Sets switching frequency via resistor-to-GND (50–900kHz) or DC voltage; GND = 350kHz, INTVCC = 535kHz. |
| PLLIN/MODE (Pin 4) | Sync input / light-load mode select | Accepts external clock (75–850kHz) or configures Burst Mode® (GND), pulse-skipping (1.2V–INTVCC−1.3V), or forced continuous (INTVCC). |
| SGND (Pin 5) | Signal ground reference | Reference for all small-signal pins (VFB, ITH, SENSE); must tie to PGND at single point to avoid noise coupling. |
| RUN (Pin 6) | Enable/shutdown control | 1.28V threshold disables control loops; <0.7V reduces IQ to <8μA - enables precise system-level power sequencing. |
| SS (Pin 7) | Soft-start ramp control | Internal 10μA current charges external capacitor to linearly ramp VOUT - prevents inrush current and output overshoot. |
| SENSE1+/SENSE1– (Pins 9,28) | Channel 1 current sense inputs | Differential inputs for RSENSE or DCR sensing; common-mode range 2.5V–38V - supports high-side or input-side sensing. |
| VFB (Pin 10) | Feedback voltage input | Compares remote output divider voltage to 1.200V reference - enables accurate regulation despite PCB trace IR drop. |
| ITH (Pin 11) | Error amplifier output / current limit setpoint | Voltage sets peak inductor current per phase; also serves as compensation node for loop stability tuning. |
| TG1/TG2 (Pins 14,23 / 17,26) | Top gate drive outputs | Drive synchronous N-MOSFET gates; 1.2Ω pull-up/pull-down and 20ns edge rates support fast, low-loss switching. |
| BG1/BG2 (Pins 16,21 / 19,24) | Bottom gate drive outputs | Drive main N-MOSFET gates; 70ns dead-time prevents shoot-through; 100% duty cycle supported. |
| BOOST1/BOOST2 (Pins 15,22 / 18,25) | Floating gate drive supplies | Charge-pump powered rails for high-side gate drive - enable efficient synchronous rectification without external bias supplies. |
| PGOOD (Pin 25) | Power-good open-drain output | Asserts low when VOUT deviates >±10% from regulation - provides system-level fault signaling with 25μs delay to reject transients. |
| ILIM (Pin 26) | Current sense threshold select | GND/FLOAT/INTVCC selects 50mV/75mV/100mV max sense voltage - optimizes resolution vs. power loss trade-off. |
Key Features
| Feature | Design Value |
|---|---|
| PolyPhase® 2-phase operation | Reduces RMS input/output ripple current by ~70% vs. single-phase - cuts required capacitor count and size by ≥50%. |
| Synchronous rectification control | Enables >95% efficiency at full load - eliminates Schottky diode losses and thermal derating constraints. |
| Programmable light-load behavior | Three selectable modes (Burst, pulse-skip, forced CCM) - maximizes efficiency across 0.1mA–10A load range without external circuitry. |
| Robust gate driver architecture | Matched 20ns rise/fall times + 70ns dead-time + 1.2Ω drive strength - ensures reliable MOSFET switching with minimal overlap loss. |
| Flexible power sourcing | Auto-selects between VBIAS LDO (4.5–38V) and EXTVCC bypass (4.8–6V) - reduces heat generation and improves system efficiency at high VIN. |
Applications
| Industrial Power Supply | Automotive LED Driver |
|---|---|
Use Scenario: 12V vehicle battery boosted to 48V for industrial IoT gateway power rail. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller managing 10A output with phase interleaving. Use Value: Reduces input capacitor requirements by 60% and lowers conducted EMI through interleaved ripple cancellation. | Use Scenario: Driving high-brightness LED arrays in commercial vehicle lighting with dimming control. IC Role / Device Role / Timing Role: Constant-current boost controller regulating LED string voltage up to 60V. Use Value: ±1% reference and RSENSE/DCR sensing enable <±3% LED current accuracy across temperature and input transients. |
| Medical Imaging Power Module | Military Portable Radio Transmitter |
Use Scenario: Generating stable 36V bias for X-ray detector sensor arrays from 24V nominal supply. IC Role / Device Role / Timing Role: High-reliability boost controller with soft-start, PGOOD monitoring, and wide temp range. Use Value: 135μA Burst Mode IQ extends battery life; 100% duty cycle maintains regulation during brownout events. | Use Scenario: Providing 28V RF power amplifier supply from 12V tactical battery with MIL-STD-704 compliance. IC Role / Device Role / Timing Role: Interleaved boost controller delivering low-noise, low-ripple 28V/5A output. Use Value: Phase-lockable frequency synchronizes to system clock - eliminates beat frequencies in sensitive RF front-ends. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3787IUFD#PBF | Same die, 28-pin 4mm×5mm QFN package (θJA = 43°C/W); identical electrical specs and pinout. | Superior thermal performance in space-constrained layouts; requires different PCB footprint and reflow profile. | Select when board area is limited and thermal management prioritized over SSOP assembly familiarity. |
| LTC3873EGN#PBF | Single-phase synchronous boost controller; fixed 150kHz frequency; no PLL sync; lower IQ (100μA) but no Burst Mode. | Lower complexity and BOM cost for ≤5A applications; lacks phase interleaving benefits and programmable frequency. | Select only for simpler, lower-power designs where ripple reduction and multi-phase scalability are unnecessary. |
Compared with LTC3787IUFD#PBF, the LTC3787IGN#PBF offers identical functionality in a legacy SSOP package with higher thermal resistance but broader manufacturing compatibility; compared with LTC3873EGN#PBF, it adds critical 2-phase interleaving, frequency programming, and Burst Mode - enabling higher power density and wider input/output flexibility.
Availability
LTC3787IGN#PBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive LED drivers, and medical imaging modules requiring stable component supply, long-term lifecycle assurance, and guaranteed −40°C to +125°C operation.
Supply support for LTC3787IGN#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 LTC3787IGN#PBF belongs to Linear's high-performance PolyPhase® controller family, engineered specifically for high-efficiency, high-power DC/DC boost conversion in demanding industrial, automotive, and medical applications where thermal management, ripple suppression, and reliability are critical.
FAQ
What is the maximum output voltage supported by the LTC3787IGN#PBF?
The LTC3787IGN#PBF supports an output voltage up to 60V. This is achieved through its robust gate drive architecture and high-voltage compatible internal comparators and references. The device does not regulate VOUT directly but controls external MOSFETs to sustain this voltage level under load, provided external components (inductors, capacitors, MOSFETs) are rated accordingly. Absolute maximum ratings confirm BOOST1/BOOST2 pins tolerate up to 76V.
Does the LTC3787IGN#PBF support synchronization to an external clock source?
Yes, the LTC3787IGN#PBF supports external clock synchronization via the PLLIN/MODE pin. When an external clock signal (75kHz–850kHz) is applied, the internal phase-locked loop locks the rising edge of BG1 to the rising edge of that clock. This enables deterministic timing across multiple converters in multiphase or distributed power systems - a core capability confirmed in the datasheet's "Oscillator and Phase-Locked Loop" section.
How does the ILIM pin affect current sensing on the LTC3787IGN#PBF?
The ILIM pin on the LTC3787IGN#PBF selects the maximum allowable current sense threshold voltage: tying ILIM to GND sets VSENSE(MAX) = 50mV, floating sets 75mV, and tying to INTVCC sets 100mV. This directly scales the peak inductor current trip point without changing external sense resistor values - allowing optimization of sensing resolution versus conduction loss across varying load conditions.
Can the LTC3787IGN#PBF operate with input voltage below 4.5V?
Yes, the LTC3787IGN#PBF can operate with input voltage as low as 2.5V after startup, provided it is biased from the output (VBIAS = VOUT) or another auxiliary supply. Its 4.5V–38V rating applies to initial startup from VBIAS; once running, the internal regulators sustain operation down to 2.5V - a key feature for brownout resilience in battery-powered systems.
What is the purpose of the SS pin on the LTC3787IGN#PBF?
The SS (Soft-Start) pin on the LTC3787IGN#PBF controls output voltage ramp rate during startup. An internal 10μA current charges an external capacitor connected from SS to SGND, generating a linear voltage ramp. The controller regulates VFB to match this ramp (0V → 1.2V) instead of the fixed reference, ensuring controlled VOUT rise and preventing inrush current - critical for protecting downstream capacitors and loads.
LTC3787IGN#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
LTC3787IGN#PBF FAQ
1.How can I place an order for LTC3787IGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3787IGN#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 LTC3787IGN#PBF reliable?
The price and inventory of LTC3787IGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3787IGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC3787IGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3787IGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3787IGN#PBF?
LTC3787IGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3787IGN#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 LTC3787IGN#PBF?
For technical support, including LTC3787IGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3787IGN#PBF requirements.
6.How does Aetrix verify that LTC3787IGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3787IGN#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 LTC3787IGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC3787IGN#PBF?
All LTC3787IGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3787IGN#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 LTC3787IGN#PBF part is unused and in its original packaging.
Return procedure for LTC3787IGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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