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Analog Devices Inc. LT3782IFE#TRPBF
- Part No.:
- LT3782IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3782IFE#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,732
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Product details
Overview
LT3782IFE#TRPBF from Analog Devices (formerly Linear Technology) is a current-mode, two-phase step-up DC/DC controller designed for high-efficiency interleaved boost conversion. It operates at up to 500kHz switching frequency, delivers 10V gate drive with 4A peak current, supports 6V–40V input, and enables 50V/4A output in typical 2-phase configurations for telecom and industrial power supplies.
For engineers reviewing the LT3782IFE#TRPBF datasheet, LT3782IFE#TRPBF pinout, LT3782IFE#TRPBF application, or LT3782IFE#TRPBF equivalent, key selection criteria include programmable duty cycle clamp (50% or higher), synchronous gate signal timing with programmable falling-edge delay, slope compensation adjustability, and thermal performance in –40°C to 125°C operation.
Technical Context
The LT3782IFE#TRPBF implements dual-channel current-mode PWM control with 180° phase interleaving, using internal flip-flops for precise timing alignment. Its transconductance error amplifier (200–370 μmho) regulates output voltage via FB pin feedback against a 2.42–2.488V reference, while dual current-sense amplifiers monitor 60mV threshold across SENSE1± and SENSE2± for per-phase overcurrent protection.
It integrates two independent 10V gate drivers (BGATE1/BGATE2) capable of ±4A peak sourcing/sinking, with programmable delay between SGATE turn-off and BGATE turn-on (100–500ns) to prevent cross-conduction in synchronous rectifier topologies. The RSET pin sets oscillator frequency (150–500kHz), and DCL pin configures maximum duty cycle (50%, 75%, or ≥90%).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 150kHz to 500kHz, set by RSET resistor; enables compact magnetics and reduced EMI in high-power boost designs. |
| Input Voltage Range | 6V to 40V; supports wide-range industrial and telecom inputs including 12V, 24V, and 36V rails. |
| Gate Drive Capability | 10V output with 4A peak source/sink current; drives high-power N-channel MOSFETs without external buffers in most applications. |
| Current Sense Threshold | 60mV per phase (SENSE1±, SENSE2±); sets accurate, temperature-stable overcurrent limit without calibration. |
| Duty Cycle Clamp | Programmable via DCL pin: 50%, 75%, or ≥90%; prevents instability in high-gain boost ratios and improves transient response. |
| Operating Temperature | –40°C to +125°C junction; qualified for extended industrial environments with θJA = 37°C/W (QFN) or 38°C/W (TSSOP). |
| Reference Voltage | 2.42V to 2.488V (typ. 2.44V); enables precise output voltage programming with <±1% initial accuracy over temperature. |
Pinout & Package
The LT3782IFE#TRPBF is supplied in a thermally enhanced 28-lead TSSOP package (FE) with exposed pad (Pin 29) soldered to PCB ground for optimal thermal dissipation. Pin functions are identical between FE and UFD packages; this part uses the FE variant rated for –40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SGATE1 / SGATE2 (Pins 1, 2 / 26, 27) | Synchronous top-FET drive outputs | Provide PWM signals to external drivers for synchronous rectification; require external buffer for high-side N-MOSFETs. |
| BGATE1 / BGATE2 (Pins 23, 20 / 22, 17) | Bottom-FET gate drivers | Deliver ±4A peak current at 10V to directly drive low-side N-MOSFETs in boost power stages. |
| SENSE1± / SENSE2± (Pins 8–9 / 13–12) | Per-phase current sense inputs | Differential inputs for 60mV overcurrent detection; require Kelvin-connected RC filters for noise immunity. |
| RSET (Pin 11 / Pin 7) | Oscillator frequency programming | Resistor-to-ground sets switching frequency (150–500kHz); also used as reference for DCL and DELAY functions. |
| DELAY (Pin 6 / Pin 2) | Programmable BGATE turn-on delay | Voltage-controlled delay (100–500ns) between SGATE turn-off and BGATE turn-on to eliminate cross-conduction. |
| DCL (Pin 7 / Pin 3) | Duty cycle limit control | Configures max duty cycle: grounded = 50%, 1.2V = 75%, tied to RSET = ≥90% for high-voltage boost applications. |
| FB (Pin 16 / Pin 13) | Feedback input for output regulation | Inverting input of gm amplifier; used with resistor divider to set output voltage based on 2.44V internal reference. |
| RUN (Pin 17 / Pin 14) | Enable/shutdown control | 2.3–2.6V threshold with 80mV hysteresis; pulls <0.65mA in shutdown, enabling precise undervoltage lockout. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved operation | Reduces input/output ripple current by ~70% vs single-phase, enabling smaller capacitors and lower EMI in 50V/4A systems. |
| Programmable slope compensation | RSLOPE resistor adjusts internal ramp gain to suppress subharmonic oscillation in high-noise, high-duty-cycle boost converters. |
| Synchronous gate timing control | Adjustable falling-edge delay on BGATE ensures safe dead-time between top/bottom FETs-critical for >90% efficiency in 48V telecom supplies. |
| Thermally optimized packaging | Exposed-pad TSSOP (FE) achieves θJA = 38°C/W; requires soldered GND pad for reliable 125°C continuous operation. |
| Robust protection suite | Includes programmable UVLO, soft-start (capacitor-timed), current limit, duty cycle clamp, and thermal shutdown-no external components needed. |
Applications
| Telecom Power Supply | Industrial Motor Drive Bias |
|---|---|
Use Scenario: Generating isolated 48V/3A output from 24V DC bus in LTE base station power modules. IC Role / Device Role / Timing Role: Two-phase boost controller managing interleaved power stage timing, current sensing, and synchronous gate sequencing. Use Value: Enables 95%+ efficiency at full load with <10mVpp output ripple, reducing heatsink size and meeting EN55022 Class B EMI limits. | Use Scenario: Providing regulated 50V/2A auxiliary supply for IGBT gate drivers in servo motor inverters. IC Role / Device Role / Timing Role: High-voltage boost controller delivering stable output under wide input variation (18–36V) and fast load transients. Use Value: Programmable duty cycle clamp prevents instability during 100ms 200% overload events, ensuring gate driver uptime during motor stall conditions. |
| Interleaved Isolated DC-DC | High-Voltage Test Equipment |
Use Scenario: Front-end boost stage feeding a transformer-isolated forward converter in medical imaging power systems. IC Role / Device Role / Timing Role: Primary-side controller synchronizing two boost phases to minimize common-mode noise coupling into sensitive analog circuits. Use Value: 180° phase shift reduces RMS input capacitor ripple current by 92%, allowing use of X7R ceramics instead of bulk electrolytics. | Use Scenario: Generating 500V@10mA bias supply from 24V input in portable insulation resistance testers. IC Role / Device Role / Timing Role: High-ratio boost controller operating at 250kHz with slope compensation to maintain stability under variable load capacitance. Use Value: Adjustable slope compensation (via RSLOPE) eliminates jitter caused by layout-induced noise on current sense lines-critical for <0.1% measurement accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar two-phase boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780EUF#PBF | Single-phase architecture; no interleaving; lower max VIN (36V); integrated MOSFET drivers lack programmable delay. | Suitable for lower-power (<2A), non-interleaved boost where EMI and ripple are less critical. | Select only if interleaving, 40V input, or programmable BGATE delay are not required. |
| LT3757EFE#PBF | Single-phase, flyback/boost/SEPIC controller; no dual-channel current sensing; no DCL or DELAY pins. | Applicable to lower-cost, lower-complexity boost designs below 3A with simpler protection requirements. | Choose when system-level interleaving is handled externally or not needed for ripple reduction. |
Compared with LTC3780EUF#PBF and LT3757EFE#PBF, the LT3782IFE#TRPBF uniquely delivers true two-phase interleaving, per-phase current limiting, and programmable synchronous timing-making it the only option for high-current, low-ripple, high-reliability 50V boost systems requiring >4A output.
Availability
LT3782IFE#TRPBF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motor drive bias, and interleaved isolated power supply designs requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +125°C operation.
Supply support for LT3782IFE#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 LT3782 series.
The LT3782IFE#TRPBF belongs to Linear's high-performance power controller family, engineered specifically for high-efficiency, high-reliability interleaved boost conversion in demanding industrial and telecom applications.
FAQ
What is the maximum output voltage achievable with the LT3782IFE#TRPBF?
The LT3782IFE#TRPBF itself does not impose a hard upper limit on output voltage-it is a controller, not a regulator. In practice, output voltage is determined by external components (inductors, MOSFETs, diodes, capacitors) and design constraints. Typical validated applications reach 50V at 4A; with appropriate 100V+ MOSFETs and layout, designs exceeding 100V have been implemented. The LT3782IFE#TRPBF's 40V VCC rating and 60mV current sense threshold remain unchanged regardless of output voltage.
Does the LT3782IFE#TRPBF support synchronization to an external clock?
Yes, the LT3782IFE#TRPBF supports external synchronization via the SYNC pin (Pin 5/Pin 1). A TTL/CMOS-compatible pulse (10%–70% duty, >200ns wide, threshold ~1.2V) can lock the internal oscillator. Because the LT3782IFE#TRPBF operates in 2-phase mode, its switching frequency equals half the SYNC frequency-so a 400kHz SYNC signal yields 200kHz operation. This feature enables system-level timing coordination in multi-rail power architectures.
How is the duty cycle limit configured on the LT3782IFE#TRPBF?
The LT3782IFE#TRPBF uses the DCL pin (Pin 7/Pin 3) to configure maximum duty cycle. Grounding DCL sets 50% clamp; applying 1.2V (e.g., via resistor divider from RSET) sets 75%; connecting DCL directly to RSET enables natural maximum duty cycle (≥90% when RSET > 80kΩ and fSW < 250kHz). The LT3782IFE#TRPBF's datasheet specifies these three discrete settings-no analog interpolation is supported, and DCL pin current is <0.3μA.
Can the LT3782IFE#TRPBF drive synchronous rectifiers without external gate drivers?
No-the LT3782IFE#TRPBF provides SGATE1/SGATE2 signals intended for external high-side gate drivers (e.g., LTC4446, ISL6146), not direct MOSFET connection. Its BGATE1/BGATE2 outputs *can* directly drive low-side N-MOSFETs (up to 4A peak), but SGATE pins lack sufficient current or voltage swing for direct FET control. Using SGATE without buffering risks shoot-through and violates the LT3782IFE#TRPBF's specified timing relationships for synchronous operation.
What thermal considerations apply to the LT3782IFE#TRPBF in continuous 125°C operation?
The LT3782IFE#TRPBF is rated for –40°C to +125°C junction temperature and features an exposed pad (Pin 29) fused to internal GND. For reliable 125°C operation, the pad must be fully soldered to a minimum 200mm² copper pour with ≥4 thermal vias (0.3mm diameter) to inner/ground planes. Thermal resistance drops from θJA = 38°C/W (standard layout) to ≤22°C/W with optimized PCB thermal design-critical for maintaining <125°C junction under 4A load at 40V input.
LT3782IFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) 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):
- 6V ~ 40V
- Frequency - Switching:
- 154kHz ~ 465kHz
- Duty Cycle (Max):
- 94%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Reset, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT3782IFE#TRPBF FAQ
1.How can I place an order for LT3782IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3782IFE#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 LT3782IFE#TRPBF reliable?
The price and inventory of LT3782IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3782IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3782IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3782IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3782IFE#TRPBF?
LT3782IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3782IFE#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 LT3782IFE#TRPBF?
For technical support, including LT3782IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3782IFE#TRPBF requirements.
6.How does Aetrix verify that LT3782IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3782IFE#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 LT3782IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3782IFE#TRPBF?
All LT3782IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3782IFE#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 LT3782IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3782IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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