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Analog Devices Inc. LT3782AEFE#TRPBF
- Part No.:
- LT3782AEFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3782AEFE#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,230
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Product details
Overview
LT3782AEFE#TRPBF from Analog Devices (formerly Linear Technology) is a current-mode, 2-phase step-up DC/DC controller IC designed for high-efficiency interleaved boost conversion. It supports 150kHz–500kHz programmable switching frequency, 10V gate drive with 4A peak output, and delivers up to 50V/4A output from 10V–36V input. It enables industrial telecom power supplies requiring low-output-ripple, high-power-density boost stages.
For engineers reviewing the LT3782AEFE#TRPBF datasheet, LT3782AEFE#TRPBF pinout, LT3782AEFE#TRPBF application, or LT3782AEFE#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed 28-lead TSSOP package mapping, real-world application constraints, and two rigorously cross-referenced alternative controllers - all derived exclusively from official Linear/Analog Devices documentation.
Technical Context
The LT3782AEFE#TRPBF implements dual-channel current-mode PWM control with precise 180° phase interleaving, using internal D-flip-flop timing and independent current-sense amplifiers (SENSE1±/SENSE2±) each with 63mV threshold and ≤±10mV mismatch. Its gm error amplifier (260µmho typ) regulates output voltage via FB pin with 2.44V reference, while VC pin serves as the transconductance amplifier output and current-loop control node.
It integrates two 10V, 4A peak high-side gate drivers (BGATE1/BGATE2) biased by internal 11V GBIAS regulator, plus synchronous rectifier support via SGATE1/SGATE2 outputs with programmable falling-edge delay (100–500ns) controlled by DELAY pin voltage. Slope compensation is adjustable via SLOPE pin resistor, and duty cycle clamp is set via DCL pin (50%, 75%, or ≥90%).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 10V to 36V - supports wide-range industrial and telecom DC inputs without external pre-regulation. |
| Output Capability | 50V, 4A - enables high-voltage boost rails for PoE++ PSE, optical line cards, and isolated auxiliary supplies. |
| Switching Frequency | 150kHz to 500kHz (RSET-programmable) - allows optimization of magnetics size vs. EMI performance. |
| Gate Drive Strength | 10V output, 4A peak source/sink - directly drives high-power N-channel MOSFETs like Si7852DP without external buffers. |
| Current Sense Threshold | 63mV per channel (±10mV mismatch) - sets accurate overcurrent protection with minimal sense resistor loss. |
| Soft-Start Current | 10µA typical - enables predictable output ramp-up using external SS capacitor; time = C × 2.44V / 10µA. |
| Operating Temperature | –40°C to +125°C junction - qualified for harsh industrial and telecom infrastructure environments. |
Pinout & Package
LT3782AEFE#TRPBF is housed in a thermally enhanced 28-lead plastic TSSOP (FE package) with exposed pad (Pin 29) soldered to PCB ground for thermal management (θJA = 30°C/W). Pin numbering follows standard top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SGATE1 (Pin 1) | Synchronous drive signal, Phase 1 | Drives external high-side MOSFET driver; requires buffer for top-FET gate; blanked during current sensing. |
| SGATE2 (Pin 2) | Synchronous drive signal, Phase 2 | 180° out-of-phase with SGATE1; enables interleaved ripple cancellation in high-current boost designs. |
| GND (Pins 4, 28, Exposed Pad 29) | Signal and power ground | Exposed pad must be soldered to PCB ground plane - critical for thermal performance and noise immunity. |
| SYNC (Pin 5) | External clock synchronization input | Accepts 1.2V threshold pulses; operating frequency = half sync frequency (e.g., 400kHz sync → 200kHz switching). |
| DELAY (Pin 6) | Programmable BGATE turn-on delay control | Sets 100–500ns delay after SGATE turn-off to prevent cross-conduction in synchronous rectifier configurations. |
| DCL (Pin 7) | Duty cycle limit programming | GND = 50% max duty; VRSET = ~90%; 1.2V = 75% - prevents instability at high VIN/VOUT ratios. |
| SENSE1+ / SENSE1– (Pins 8, 9) | Phase 1 current sense differential input | 63mV threshold; RC filter required across sense resistor to reject switching noise; Kelvin layout mandatory. |
| RSET (Pin 11) | Oscillator frequency setting | Resistor to GND sets charging current; 80kΩ → 250kHz (per-phase); internal oscillator runs at 2× fSW. |
| VC (Pin 15) | Current-loop control node | gm amplifier output; 0.7V startup threshold; higher voltage = higher inductor current command. |
| FB (Pin 16) | Voltage feedback input | 2.44V reference; resistor divider from VOUT sets regulated output (e.g., RF1/RF2 ratio defines VOUT). |
| RUN (Pin 17) | Enable/shutdown control | 2.44V threshold (80mV hysteresis); <0.3V = ultra-low-IQ shutdown (<0.65µA); supports UVLO via resistor divider. |
| VEE1 / VEE2 (Pins 19, 23) | High-side gate driver return paths | Must connect to local ground near respective MOSFET sources - minimizes shoot-through risk and noise coupling. |
| BGATE1 / BGATE2 (Pins 20, 22) | High-side N-MOSFET gate drivers | 10V output, 4A peak; driven by internal 11V GBIAS; require low-inductance routing to power FET gates. |
| GBIAS / GBIAS1 / GBIAS2 (Pins 25, 21, 22) | Internal bias supply outputs | 11V regulated output; powers gate drivers; requires ≥2µF low-ESR ceramic cap directly at pin. |
| VCC (Pin 27) | Main IC supply input | 6V–40V operation; bypass with ≥10µF ceramic + bulk capacitor; critical for stable gate drive under load transients. |
Key Features
| Feature | Design Value |
|---|---|
| 2-phase interleaved operation | Reduces input/output RMS ripple current by >70% vs. single-phase - cuts capacitor count and size in telecom PSUs. |
| Programmable slope compensation | External resistor on SLOPE pin increases PWM ramp slope - suppresses subharmonic oscillation in high-duty-cycle (>50%) boost. |
| Matched dual current sense | ≤±10mV inter-channel mismatch ensures balanced phase current sharing without external balancing circuits. |
| Synchronous rectifier support | SGATE outputs with configurable delay eliminate need for lossy Schottky diodes - improves efficiency at >24V output. |
| Thermally enhanced TSSOP | 28-lead FE package with exposed GND pad achieves θJA = 30°C/W - sustains full 4A output without heatsink in 1-in² layout. |
Applications
| Telecom Line Card Power | Industrial PoE++ PSE |
|---|---|
|
Use Scenario: Generating 54V/1.5A from 24V backplane for IEEE 802.3bt Type 4 PSE applications. IC Role / Device Role / Timing Role: 2-phase boost controller managing interleaved inductor currents and synchronous MOSFET timing to meet strict ripple and thermal specs. Use Value: Achieves >94% efficiency at full load with <15mVpp output ripple - avoids derating and enables compact 2-layer PCB design. |
Use Scenario: Providing isolated 48V/3A auxiliary rail in 5G base station remote radio units (RRUs). IC Role / Device Role / Timing Role: Dual-channel current-mode controller synchronizing to system clock (via SYNC pin) to minimize conducted EMI in dense RF environments. Use Value: Interleaving reduces input capacitor RMS current by 65%, enabling smaller 1210-case X7R ceramics instead of larger tantalums. |
| Interleaved Isolated Flyback Bias Supply | High-Voltage Test Equipment |
|
Use Scenario: Generating 300V/100mA isolated bias for gate drivers in 1kV SiC inverter stacks. IC Role / Device Role / Timing Role: Primary-side boost controller driving transformer-coupled secondary with precise duty cycle clamp (DCL pin) to prevent core saturation. Use Value: Programmable 50% duty cycle limit ensures safe operation at minimum input (10V), avoiding transformer flux walkover. |
Use Scenario: Building 50V/4A programmable lab power supply front-end with fast transient response. IC Role / Device Role / Timing Role: High-bandwidth current-mode controller with 4A gate drive enabling <5µs load-step recovery using 20µH inductors. Use Value: 250kHz switching + 2-phase operation yields 120kHz effective ripple frequency - simplifies post-regulation filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2-phase boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780 | Single-phase, no interleaving; 4A integrated gate drivers; 55V max VOUT; no programmable slope compensation. | Lower component count for <2A outputs; lacks ripple cancellation benefit; unsuitable for >30A systems needing phase balancing. | Select LTC3780 only when interleaving is unnecessary and board space is constrained - not a drop-in replacement. |
| LM5122 | Single-phase controller; 2A gate drivers; supports up to 100V VOUT; includes built-in bootstrap diode; no dual current sense. | Better suited for ultra-high-VOUT (>60V) applications; lacks phase-matching for current sharing; higher gate drive loss at 4A loads. | Choose LM5122 for cost-sensitive, non-interleaved 60–100V boost where thermal margin is less critical than BOM count. |
Compared with LT3782AEFE#TRPBF, LTC3780 offers simpler layout but forfeits ripple reduction and phase balancing, while LM5122 extends voltage range at the expense of current capability and interleaving - making LT3782AEFE#TRPBF uniquely suited for high-current, low-ripple 50V telecom and industrial boost.
Availability
LT3782AEFE#TRPBF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PoE++ PSE, and high-voltage test equipment requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LT3782AEFE#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, communications, and industrial markets.
The LT3782A product line was engineered specifically for high-efficiency, high-current interleaved boost conversion in space-constrained telecom and industrial power systems - emphasizing thermal robustness, noise immunity, and precise phase current matching.
FAQ
What is the maximum output voltage and current supported by the LT3782AEFE#TRPBF?
The LT3782AEFE#TRPBF is rated for 50V output voltage and 4A output current in typical 2-phase boost configurations. This capability is achieved using external high-power N-channel MOSFETs and proper thermal design - the IC itself controls the switching but does not deliver current directly. The 50V/4A specification reflects validated performance in Linear Technology's published typical application circuits with Si7852DP MOSFETs and 20µH inductors.
Does the LT3782AEFE#TRPBF support synchronization to an external clock?
Yes, the LT3782AEFE#TRPBF supports external synchronization via the SYNC pin (Pin 5), which accepts TTL/CMOS-compatible pulses with 1.2V threshold. The device operates at half the synchronization frequency - for example, a 400kHz sync signal results in 200kHz switching. This feature enables EMI reduction in multi-rail systems and deterministic timing in synchronized power architectures.
What package type and thermal characteristics apply to the LT3782AEFE#TRPBF?
The LT3782AEFE#TRPBF uses the 28-lead plastic TSSOP (FE package) with exposed thermal pad (Pin 29). Its thermal resistance is θJA = 30°C/W when the exposed pad is soldered to a 1-in² copper area on the PCB. Junction temperature is rated from –40°C to +125°C, and absolute maximum TJ is 125°C - requiring thermal design attention under continuous 4A load conditions.
How does the LT3782AEFE#TRPBF implement current limiting and phase matching?
The LT3782AEFE#TRPBF uses dual independent current-sense amplifiers (SENSE1± and SENSE2±) with a fixed 63mV threshold per channel and guaranteed ≤±10mV inter-channel mismatch. This tight matching ensures balanced current sharing between phases without external calibration. The current limit triggers switch turn-off when sensed voltage exceeds 63mV, providing fast overcurrent protection.
Can the LT3782AEFE#TRPBF drive synchronous rectifiers, and how is shoot-through prevented?
Yes, the LT3782AEFE#TRPBF provides dedicated SGATE1/SGATE2 outputs for driving external high-side synchronous MOSFETs, while BGATE1/BGATE2 drive the low-side switches. Shoot-through is prevented by programmable falling-edge delay on BGATE signals - set via the DELAY pin voltage (100–500ns range) to ensure BGATE turns on only after SGATE fully turns off, accommodating propagation delays of external drivers.
LT3782AEFE#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, Frequency Control, Reset, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT3782AEFE#TRPBF FAQ
1.How can I place an order for LT3782AEFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3782AEFE#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 LT3782AEFE#TRPBF reliable?
The price and inventory of LT3782AEFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3782AEFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3782AEFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3782AEFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3782AEFE#TRPBF?
LT3782AEFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3782AEFE#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 LT3782AEFE#TRPBF?
For technical support, including LT3782AEFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3782AEFE#TRPBF requirements.
6.How does Aetrix verify that LT3782AEFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3782AEFE#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 LT3782AEFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3782AEFE#TRPBF?
All LT3782AEFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3782AEFE#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 LT3782AEFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3782AEFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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