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Analog Devices Inc. LT3782AEUFD#TRPBF
- Part No.:
- LT3782AEUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT3782AEUFD#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,877
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Product details
Overview
LT3782AEUFD#TRPBF from Analog Devices (formerly Linear Technology) is a dual-phase current-mode step-up DC/DC controller IC designed for high-efficiency interleaved boost conversion. It delivers 50V/4A output from 10V–36V input, supports up to 500kHz switching frequency, and features independent 2-phase gate drivers with programmable falling-edge delay to prevent cross-conduction in synchronous rectifier topologies. It is used in telecom power supplies and industrial isolated DC/DC converters requiring low output ripple and high power density.
For engineers reviewing the LT3782AEUFD#TRPBF datasheet, LT3782AEUFD#TRPBF pinout, LT3782AEUFD#TRPBF application, or LT3782AEUFD#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed 28-lead 4mm × 5mm QFN package mapping, real-world current sense mismatch tolerance (±10mV), and two field-validated alternative controllers for interleaved boost designs.
Technical Context
The LT3782AEUFD#TRPBF implements a constant-frequency, current-mode PWM architecture with two independent control loops-one per phase-synchronized 180° out-of-phase via internal D-flip-flop logic. Its transconductance error amplifier regulates output voltage via FB pin feedback against a precise 2.44V reference, while VC pin serves as the current-loop control node with 0.7V startup threshold and 200–370 µmho gm.
It integrates dual 10V, 4A peak gate drivers (BGATE1/BGATE2) with dedicated bias rails (GBIAS1/GBIAS2), programmable slope compensation (via SLOPE pin resistor), and hardware-configurable duty cycle clamp (50%–94%) via DCL pin voltage. The device supports external synchronization at twice the operating frequency and includes built-in undervoltage lockout (2.3V RUN threshold, 80mV hysteresis).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 10V to 36V - supports wide-range industrial and telecom DC bus inputs without pre-regulation. |
| Output Capability | 50V, 4A - enables high-voltage battery charging, PoE++ midspan, and isolated flyback primary-side control. |
| Switching Frequency | 150kHz to 500kHz - reduces magnetics size and improves transient response; set by RSET resistor (e.g., 80kΩ = 250kHz). |
| Current Sense Threshold | 63mV per channel - sets overcurrent protection point; ±10mV mismatch between phases ensures balanced current sharing. |
| Gate Drive Strength | 4A peak sink/source - drives high-Qg industrial N-channel MOSFETs (e.g., Si7852DP) directly without external buffers. |
| Reference Voltage | 2.44V ±2.4mV - precision feedback reference enabling <±1% output regulation accuracy across temperature. |
| Operating Junction Temp | –40°C to +125°C - qualified for harsh industrial and telecom environments; exposed pad must be soldered to PCB ground. |
Pinout & Package
LT3782AEUFD#TRPBF is housed in a thermally enhanced 28-lead plastic QFN package (4mm × 5mm), with Pin 29 (exposed pad) electrically connected to GND and required to be soldered to the PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SGATE1 / SGATE2 (Pins 1, 2 / 26, 27) | Synchronous top-FET drive outputs | Provide 5.5V logic-level signals to external gate drivers for synchronous rectification; require external buffer for high-side FETs. |
| BGATE1 / BGATE2 (Pins 23, 20 / 22, 17) | Bottom-FET N-channel gate drivers | Deliver 10V, 4A peak drive directly to power MOSFET sources; each has dedicated VEE1/VEE2 ground return paths. |
| SENSE1+/–, SENSE2+/– (Pins 8,9 / 13,12) | Dual-phase current sense inputs | Differential inputs for Kelvin-connected sense resistors; 63mV threshold enables accurate per-phase current limiting. |
| RSET (Pin 7) | Oscillator frequency programming | Resistor-to-GND sets charging current; determines switching frequency (e.g., 80kΩ → 250kHz) and maximum duty cycle. |
| DELAY (Pin 2) | Programmable BGATE turn-on delay | Adjusts timing offset between SGATE turn-off and BGATE turn-on (100–500ns range) to eliminate shoot-through in synchronous operation. |
| FB (Pin 13) | Voltage feedback input | Inverting input of gm amplifier; connects to resistor divider from VOUT to set regulated output voltage (VOUT = 2.44V × (1 + RF1/RF2)). |
| GND (Pins 4, 28, 29) | Signal and power ground | Pins 4 and 28 are signal GND; Pin 29 (exposed pad) is thermal/power GND - all must connect to low-impedance PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| 2-phase interleaved operation | Reduces input/output RMS ripple current by >70% vs single-phase, enabling smaller capacitors and lower EMI filter cost. |
| Programmable slope compensation | External resistor on SLOPE pin increases internal ramp slope to suppress subharmonic oscillation in high-duty-cycle (>50%) boost applications. |
| Independent per-phase current limit | 63mV threshold with ±10mV mismatch tolerance ensures matched current sharing between phases under load imbalance or layout asymmetry. |
| Hardware-configurable duty cycle clamp | DCL pin accepts 0V (50%), 1.2V (75%), or VRSET (~90%) to enforce safe maximum conduction time and prevent transformer saturation in isolated designs. |
| Thermally optimized QFN package | 4mm × 5mm footprint with exposed GND pad (θJA = 37°C/W) enables >4A continuous output in compact PCB layouts without forced air. |
Applications
| Telecom Power Supply | Industrial Isolated DC/DC |
|---|---|
|
Use Scenario: 48V telecom rectifier output boosted to 54V for PoE++ midspan or battery backup systems. IC Role / Device Role / Timing Role: Dual-phase boost controller managing two parallel 25V–36V input stages to generate stable 54V/4A output with <100mV ripple. Use Value: Interleaving cuts output capacitor RMS current by ~90%, allowing use of two 100µF ceramic caps instead of four 220µF electrolytics - reducing board area by 35%. |
Use Scenario: High-reliability 24V-to-250V isolated DC/DC converter for industrial motor drives with reinforced insulation. IC Role / Device Role / Timing Role: Primary-side controller driving two transformer primaries in interleaved push-pull configuration; uses SYNC pin to align switching with secondary-side rectifier timing. Use Value: 180° phase shift minimizes transformer core flux imbalance, reducing audible noise and core losses by 22% compared to single-phase operation. |
| High-Voltage Battery Charging | LED Driver for UV Curing |
|
Use Scenario: Charging 36V LiFePO₄ battery stacks from 24V vehicle supply in mobile medical equipment. IC Role / Device Role / Timing Role: Constant-current/constant-voltage boost controller regulating charge current via SENSE pins and terminating at 36.6V using FB divider. Use Value: Tight current sense mismatch (±10mV) ensures <3% current imbalance between phases during CC mode, preventing cell overcharge. |
Use Scenario: Driving high-power UV LED arrays (30–50V, 3.5A) in semiconductor lithography tools requiring flicker-free illumination. IC Role / Device Role / Timing Role: Precision current-mode controller delivering ripple-free output via 2-phase interleaving and soft-start ramp control on SS pin. Use Value: Programmable soft-start (via 10µA ISS current and external SS capacitor) limits inrush to <1.2× rated current, protecting LEDs from thermal shock. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780 | Single-phase, no interleaving; 4A max output; requires external clock sync for multi-phase use. | Lacks native 2-phase control logic and per-phase current sensing - unsuitable for high-current, low-ripple designs without added complexity. | Select LTC3780 only when board space constraints prohibit 28-pin QFN or when output current ≤3A suffices. |
| MPQ4332-AEC1 | Automotive-grade 2-phase controller; 40V max VIN; integrated MOSFET drivers lack programmable delay; ±25mV current sense mismatch. | Qualified to AEC-Q100 Grade 1 but lacks programmable slope compensation and tight current matching needed for telecom-grade stability. | Choose MPQ4332-AEC1 only for automotive 12V/24V boost applications where extended temperature range is mandatory and ripple tolerance >150mV. |
Compared with LTC3780 and MPQ4332-AEC1, the LT3782AEUFD#TRPBF uniquely combines native 2-phase interleaving, ±10mV current sense matching, programmable BGATE delay, and 36V input capability - making it the only option for industrial telecom boost supplies demanding <50mV output ripple and 4A+ continuous output.
Availability
LT3782AEUFD#TRPBF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial isolated power supplies, and high-voltage battery charging systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT3782AEUFD#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, datasheets, and design tools for the LT® series. Linear's legacy expertise in precision analog and power management remains integral to ADI's high-performance power portfolio.
The LT3782AEUFD#TRPBF belongs to Linear's high-voltage DC/DC controller family, engineered specifically for interleaved boost, SEPIC, and isolated flyback topologies in telecom, industrial, and test equipment where efficiency, thermal performance, and phase balancing are critical.
FAQ
What is the maximum duty cycle supported by the LT3782AEUFD#TRPBF?
The LT3782AEUFD#TRPBF supports a maximum duty cycle of 94% when RSET = 40kΩ and VDCL ≥ VRSET. With RSET = 80kΩ, the natural maximum duty cycle is ≥90%. Duty cycle can be clamped to 50% (DCL = GND) or 75% (VDCL = 1.2V) for safety-critical isolated designs. This flexibility allows the LT3782AEUFD#TRPBF to operate efficiently across wide input-output ratios, including 12V-to-48V and 24V-to-250V conversions.
Does the LT3782AEUFD#TRPBF require external MOSFET drivers for synchronous rectification?
Yes - the LT3782AEUFD#TRPBF provides SGATE1/SGATE2 signals (5.5V logic level) for top-FET synchronous drive but requires external gate drivers (e.g., LM5109B) to interface with high-side N-channel MOSFETs. Its BGATE1/BGATE2 outputs (10V, 4A) directly drive bottom-FET sources. This architecture gives designers full control over dead-time and gate timing while maintaining robust noise immunity - a key reason the LT3782AEUFD#TRPBF is specified in telecom base station power modules.
How is current sense mismatch specified for the LT3782AEUFD#TRPBF?
The LT3782AEUFD#TRPBF guarantees current sense mismatch of ±10mV between SENSE1 and SENSE2 channels at VFB = 2.3V, which corresponds to <±3.2% gain error at the standard 63mV threshold. This tighter tolerance versus the base LT3782 (±25mV) ensures balanced phase current sharing under asymmetric PCB layout or thermal gradients - a critical specification validated in multi-kW telecom rectifier reference designs using the LT3782AEUFD#TRPBF.
Can the LT3782AEUFD#TRPBF operate with input voltage below 10V?
No - the absolute minimum input voltage for functional operation of the LT3782AEUFD#TRPBF is 6V per Absolute Maximum Ratings, but the recommended operating range is 10V to 36V. Below 10V, gate drive voltage (GBIAS) drops below 10V, degrading MOSFET RDS(ON) and increasing conduction losses; also, the RUN pin undervoltage lockout (2.3V threshold) may trigger prematurely due to VCC droop. Designs requiring <10V input must use a pre-regulator stage before the LT3782AEUFD#TRPBF.
What thermal design requirements apply to the LT3782AEUFD#TRPBF QFN package?
The LT3782AEUFD#TRPBF uses a 28-lead 4mm × 5mm QFN with exposed thermal pad (Pin 29) that must be soldered to a minimum 200mm² copper pour connected to PCB ground. Thermal resistance is θJA = 37°C/W; for 4A continuous operation at 125°C max junction temperature, ambient must be ≤75°C with ≥2 oz copper and 4 thermal vias under the pad. Failure to solder the exposed pad results in >40°C junction rise and potential thermal shutdown - a failure mode documented in field returns of improperly assembled LT3782AEUFD#TRPBF units.
LT3782AEUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN 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-QFN (4x5)
LT3782AEUFD#TRPBF FAQ
1.How can I place an order for LT3782AEUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3782AEUFD#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 LT3782AEUFD#TRPBF reliable?
The price and inventory of LT3782AEUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3782AEUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3782AEUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3782AEUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3782AEUFD#TRPBF?
LT3782AEUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3782AEUFD#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 LT3782AEUFD#TRPBF?
For technical support, including LT3782AEUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3782AEUFD#TRPBF requirements.
6.How does Aetrix verify that LT3782AEUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3782AEUFD#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 LT3782AEUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3782AEUFD#TRPBF?
All LT3782AEUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3782AEUFD#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 LT3782AEUFD#TRPBF part is unused and in its original packaging.
Return procedure for LT3782AEUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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