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Analog Devices Inc. LTC3787IGN#TRPBF
- Part No.:
- LTC3787IGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3787IGN#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,096
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Product details
Overview
LTC3787IGN#TRPBF from Analog Devices (formerly Linear Technology) is a dual-phase synchronous boost controller IC designed for high-efficiency, high-power DC/DC conversion in industrial and automotive systems. It supports 4.5V–38V input, delivers up to 60V output, operates down to 2.5V after startup, features ±1% 1.200V reference accuracy, and enables 2-/3-/4-/6-/12-phase configurations via PolyPhase® architecture.
For engineers reviewing the LTC3787IGN#TRPBF datasheet, LTC3787IGN#TRPBF pinout, LTC3787IGN#TRPBF application, or LTC3787IGN#TRPBF equivalent, key selection criteria include its 28-pin SSOP package, phase-lockable 75kHz–850kHz switching frequency, RSENSE/DCR current sensing, 100% duty cycle capability, and thermally enhanced operation across –40°C to 125°C.
Technical Context
The LTC3787IGN#TRPBF implements constant-frequency current-mode control with two out-of-phase N-channel MOSFET drivers, enabling interleaved operation that reduces input/output ripple and capacitor stress. Its dual-channel architecture supports independent current sensing per phase using either external sense resistors or inductor DCR, with matching tolerance of ±12mV between SENSE1 and SENSE2 maximum thresholds.
Internal circuitry includes a 5.4V LDO (INTVCC) powered from VBIAS or EXTVCC, a PLL-based synchronization engine for multi-controller daisy-chaining, and three selectable light-load modes-Burst Mode®, pulse-skipping, or forced continuous-controlled via the PLLIN/MODE pin with defined voltage thresholds and hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V (abs max 40V); operates down to 2.5V post-startup for transient ride-through in battery-fed systems. |
| Output Voltage Range | Up to 60V; set via external resistor divider on VFB with ±1% 1.200V internal reference. |
| Switching Frequency | Programmable 50kHz–900kHz or phase-locked 75kHz–850kHz; enables EMI optimization and inductor size reduction. |
| Quiescent Current | 135μA in pulse-skipping/forced continuous mode; <8μA in shutdown-critical for always-on automotive modules. |
| Current Sense Threshold | Selectable 42mV/68mV/90mV via ILIM pin (GND/float/INTVCC); supports precision overcurrent protection with matched channel tolerance. |
| Package Thermal Resistance | θJA = 90°C/W (SSOP); requires careful PCB copper pour design for thermal management at >10A output. |
| Operating Temperature | –40°C to +125°C junction; qualified for industrial and automotive underhood environments. |
Pinout & Package
28-lead plastic SSOP package (GN), 10.2mm × 5.3mm body, 0.635mm pitch, exposed pad not present (unlike QFN UFD variant). Pin 1 marked by notch/dot; pin 1 is ILIM.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM (Pin 1) | Current limit threshold select | Configures peak sense voltage to 42mV (GND), 68mV (float), or 90mV (INTVCC) - sets overcurrent trip point per phase. |
| SENSE1+/SENSE1– (Pins 2,3) | Phase 1 current sense differential input | Accepts 2.5V–38V common-mode voltage; supports RSENSE or DCR sensing with ±12mV matching vs SENSE2. |
| FREQ (Pin 4) | Oscillator frequency programming | Resistor-to-GND sets 50kHz–900kHz; direct DC voltage or INTVCC/GND selects fixed frequencies (350kHz/535kHz). |
| PHASMD (Pin 5) | Phase relationship control | Float/SGND/INTVCC configures 0°/180°/90° phase offset between BG1/BG2 and CLKOUT for multiphase synchronization. |
| CLKOUT (Pin 6) | Multiphase daisy-chain clock output | Drives next LTC3787's PLLIN/MODE; swing between SGND and INTVCC; timing referenced to BG1 edge. |
| PLLIN/MODE (Pin 7) | Sync input / light-load mode select | External clock input (75kHz–850kHz) or voltage-selectable mode: GND=Burst, INTVCC=continuous, 1.2V–(INTVCC−1.3V)=pulse-skip. |
| SS (Pin 10) | Soft-start ramp control | Capacitor-to-SGND sets linear VOUT ramp rate; internal 10μA current charges capacitor from 0V to 1.2V. |
| VFB (Pin 13) | Feedback voltage input | Compares output divider voltage against 1.200V reference; ±5nA input bias enables high-resistance dividers. |
| ITH (Pin 14) | Error amplifier output / current limit threshold | Voltage sets per-phase peak inductor current; range ~0.425V–2V; also used for loop compensation. |
| SW1/SW2 (Pins 16,27) | Switch node connections | Connect to source of sync FET and drain of main FET; high dv/dt nodes requiring tight layout and Kelvin sensing. |
| TG1/TG2 (Pins 17,26) | Top gate drive outputs | Drive gates of synchronous N-MOSFETs; 1.2Ω pull-up/pull-down resistance supports fast 20ns rise/fall times. |
| BOOST1/BOOST2 (Pins 18,25) | Floating bootstrap supplies | Bypassed to SWx with ceramic caps; powered via Schottky diode from INTVCC - enables high-side N-FET drive. |
| PGND (Pin 22) | Power ground return | Return path for bottom FET sources and CIN/COUT negatives; must tie to SGND at single point to avoid noise coupling. |
| INTVCC (Pin 20) | Internal 5.4V LDO output | Supplies control logic and gate drivers; decoupled with ≥4.7μF low-ESR ceramic; regulated to ±2% load line. |
| VBIAS (Pin 23) | Main bias supply input | Primary power source (4.5V–38V); powers INTVCC LDO when EXTVCC <4.8V; bypass capacitor required. |
| PGOOD (Pin 28) | Open-drain power-good indicator | Pulled low when VOUT deviates >±10% from regulation; 25μs delay prevents false triggering during transients. |
Key Features
| Feature | Design Value |
|---|---|
| PolyPhase® interleaving support | Enables 2-/3-/4-/6-/12-phase configurations to halve input/output ripple current and reduce capacitor RMS current stress. |
| 100% duty cycle capability | Allows seamless transition to dropout conditions-maintains regulation even when VIN approaches VOUT minus diode drop. |
| Three light-load operating modes | Burst Mode® (135μA IQ), pulse-skipping, or forced continuous-selectable via single pin voltage without external components. |
| Integrated 5.4V LDO with EXTVCC switchover | Reduces thermal dissipation by bypassing VBIAS LDO when external 4.8V–6V supply is available on EXTVCC pin. |
| Matched dual-channel current sensing | SENSE1/SENSE2 thresholds match within ±12mV, ensuring balanced phase current sharing without external calibration. |
| Robust start-up and shutdown control | RUN pin provides dual-threshold shutdown (1.28V = disable control loops; 0.7V = full shutdown @ <8μA IQ). |
Applications
| Automotive ADAS Power Supply | Industrial Motor Drive Bias Supply |
|---|---|
Use Scenario: Powers radar transceiver modules requiring stable 24V/10A from 12V vehicle battery with cold-crank immunity down to 2.5V. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller managing interleaved gate drives and current-mode regulation with phase synchronization. Use Value: Reduces input capacitance by 50% vs single-phase design and maintains regulation during 100ms 4.5V battery dips-meeting ISO 16750-2 Pulse 4a requirements. | Use Scenario: Generates isolated 48V bias rail for IGBT gate drivers in servo motor inverters operating in factory automation environments. IC Role / Device Role / Timing Role: High-voltage boost controller delivering up to 60V output with programmable frequency to avoid EMI bands near 400Hz motor commutation harmonics. Use Value: Achieves >94% efficiency at 10A load while supporting 125°C ambient via SSOP thermal design-eliminating need for heatsinks in enclosed cabinets. |
| Medical Imaging Detector Bias | Military Portable Radio PA Supply |
Use Scenario: Supplies low-noise ±24V rails for CMOS image sensor bias in portable ultrasound devices using shared input battery. IC Role / Device Role / Timing Role: PolyPhase® controller operating in Burst Mode® to maintain <150μA system standby current while enabling fast wake-up. Use Value: Delivers <10mVpp output ripple at full load via interleaved operation-preventing signal corruption in analog front-end amplifiers. | Use Scenario: Powers 50W RF power amplifier stages in handheld tactical radios using 24V nominal Li-ion packs with wide discharge range. IC Role / Device Role / Timing Role: Synchronous boost controller with phase-lockable frequency enabling synchronized switching across multiple PA supply rails. Use Value: Enables precise EMI alignment across three parallel LTC3787IGN#TRPBF units-reducing conducted emissions by 12dBμV in 30–230MHz CISPR 22 band. |
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#TRPBF | Same die, 28-pin 4mm×5mm QFN package with θJA = 43°C/W (vs 90°C/W for SSOP); exposed pad requires soldered GND connection. | Better thermal performance for high-current (>15A) or compact layouts; unsuitable where SSOP footprint or leaded assembly is mandated. | Select when board space and thermal headroom are constrained; verify PCB land pattern matches UFD package dimensions and thermal pad requirements. |
| LT8337EFE#TRPBF | Single-phase 60V boost controller; 125°C rating; integrated 2.5A switch; no PolyPhase® or multi-phase sync capability. | Lower BOM count for ≤5A applications; lacks phase interleaving, current matching, or CLKOUT daisy-chaining functionality. | Choose for cost-sensitive, lower-power designs where interleaving benefits are unnecessary and integrated switch suffices. |
Compared with LTC3787IGN#TRPBF, the IUFD variant offers superior thermal performance in space-constrained layouts but requires QFN reflow and grounding, while LT8337EFE simplifies design for sub-5A needs but forfeits multi-phase scalability and precision current balancing.
Availability
LTC3787IGN#TRPBF is available at Aetrix Electronics and suitable for industrial motor drives, automotive ADAS power supplies, and medical imaging detector bias circuits requiring stable component supply with extended temperature qualification and long-term lifecycle support.
Supply support for LTC3787IGN#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, documentation, and manufacturing continuity for all Linear ICs including the LTC3787 series.
The LTC3787 belongs to Linear's high-performance power controller family, engineered specifically for demanding multi-phase boost applications in harsh environments-emphasizing efficiency, thermal resilience, and precise current balancing across channels.
FAQ
What is the absolute maximum input voltage rating for the LTC3787IGN#TRPBF?
The LTC3787IGN#TRPBF has an absolute maximum VBIAS rating of 40V. Continuous operation above 38V violates the recommended operating condition and risks permanent damage. The device is rated for 4.5V to 38V normal operation, with transient ride-through down to 2.5V after startup-making it suitable for 24V automotive systems experiencing load dump or cold-crank events.
Can the LTC3787IGN#TRPBF operate in single-phase mode?
Yes, the LTC3787IGN#TRPBF can be configured for single-phase operation by connecting both TG1/TG2 and BG1/BG2 outputs in parallel and disabling one channel's current sense inputs. However, this forfeits interleaving benefits and requires external current sharing mechanisms. The IC's native design targets dual-phase or higher PolyPhase® configurations for optimal ripple reduction and thermal distribution.
How does the ILIM pin affect current limiting on the LTC3787IGN#TRPBF?
The ILIM pin on the LTC3787IGN#TRPBF selects the peak current sense threshold: grounded = 42mV, floating = 68mV, tied to INTVCC = 90mV. This directly sets the maximum allowable inductor current per phase before the current comparator trips. Matching tolerance between SENSE1 and SENSE2 is ±12mV, ensuring balanced phase current sharing without external calibration.
What is the purpose of the PHASMD pin on the LTC3787IGN#TRPBF?
The PHASMD pin on the LTC3787IGN#TRPBF controls the phase relationship between the two bottom gate drivers (BG1/BG2) and the CLKOUT signal. When floated, it defaults to 180° phase shift; tied to SGND it forces 0° (in-phase); tied to INTVCC it sets 90° offset. This enables precise synchronization in multi-phase systems-critical for reducing input ripple and avoiding beat frequencies in stacked converters.
Does the LTC3787IGN#TRPBF support external current sensing using DCR?
Yes, the LTC3787IGN#TRPBF supports both RSENSE and inductor DCR current sensing. The SENSE+ pins provide bias current to the DCR network, and the common-mode voltage range (2.5V–38V) accommodates high-side or low-side DCR placement. DCR sensing eliminates power loss from discrete sense resistors-improving efficiency in high-current applications like motor drive bias supplies.
LTC3787IGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- 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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC3787IGN#TRPBF FAQ
1.How can I place an order for LTC3787IGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3787IGN#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 LTC3787IGN#TRPBF reliable?
The price and inventory of LTC3787IGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3787IGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3787IGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3787IGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3787IGN#TRPBF?
LTC3787IGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3787IGN#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 LTC3787IGN#TRPBF?
For technical support, including LTC3787IGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3787IGN#TRPBF requirements.
6.How does Aetrix verify that LTC3787IGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3787IGN#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 LTC3787IGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3787IGN#TRPBF?
All LTC3787IGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3787IGN#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 LTC3787IGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC3787IGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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