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Analog Devices Inc. LT3782AIUFD#PBF
- Part No.:
- LT3782AIUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT3782AIUFD#PBF.pdf
- Description:
- IC REG CTRLR BOOST 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,195
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Product details
Overview
LT3782AIUFD#PBF 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 delivers up to 50V/4A output from 10V–36V input, operates at 150kHz–500kHz switching frequency, features dual 10V/4A peak gate drivers, and supports programmable slope compensation and duty cycle clamp. It is used in telecom infrastructure power supplies requiring low-output-ripple, high-power-density boost stages.
For engineers reviewing the LT3782AIUFD#PBF datasheet, LT3782AIUFD#PBF pinout, LT3782AIUFD#PBF application, or LT3782AIUFD#PBF equivalent, key selection considerations include its 28-pin 4mm × 5mm QFN package with exposed thermal pad, dual-phase current-sense mismatch tolerance (±10mV), synchronous gate drive timing control via DELAY pin, and compatibility with external high-power N-channel MOSFETs in industrial and telecom boost converters.
Technical Context
The LT3782AIUFD#PBF implements constant-frequency current-mode control across two interleaved phases with precise 180° phase shift enforced by internal D-flip-flop logic. Its transconductance error amplifier regulates output voltage via FB pin while VC pin serves as the current-loop control node, with switching initiated at VC ≥ 0.7V.
It integrates dual high-current gate drivers (BGATE1/BGATE2) capable of 4A peak sourcing/sinking, programmable soft-start via SS pin (10µA charging current), and independent current-limit thresholds (63mV per channel) with <±10mV mismatch between SENSE1+/SENSE1– and SENSE2+/SENSE2– inputs. The RSET pin sets oscillator frequency (150–500kHz), and SYNC pin enables external synchronization at twice the operating frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 10V to 36V - supports wide-range industrial and telecom input rails without pre-regulation. |
| Output Capability | 50V, 4A - enables high-voltage boost stages for PoE++, battery charging, and isolated flyback primary-side biasing. |
| Switching Frequency | 150kHz to 500kHz - adjustable via RSET resistor; higher frequencies reduce passive size but increase switching loss. |
| Gate Drive Strength | 10V output, 4A peak source/sink - directly drives high-power N-MOSFETs (e.g., Si7852DP) without external buffers in most cases. |
| Current Sense Threshold | 63mV per channel - sets overcurrent limit; ±10mV mismatch ensures balanced phase current sharing in 2-phase operation. |
| Duty Cycle Clamp | Programmable 50%, 75%, or ≥90% - prevents instability at high VIN/VOUT ratios and enables safe operation near duty-cycle limits. |
| Operating Temperature | –40°C to +125°C - qualified for industrial and telecom base station environments with full parameter assurance. |
Pinout & Package
LT3782AIUFD#PBF is housed in a thermally enhanced 28-lead (4mm × 5mm) plastic QFN package with exposed GND pad (Pin 29) that must be soldered to PCB ground for thermal performance (θJA = 37°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SGATE1 / SGATE2 (Pins 1, 2 / 26, 27) | Synchronous top-FET drive outputs | Drive external gate drivers for synchronous rectification; require external buffer for high-side NMOS switches. |
| BGATE1 / BGATE2 (Pins 23, 20 / 22, 17) | Bottom-FET gate drivers | 10V, 4A peak drive signals for main boost switches; GBIAS1/GBIAS2 pins supply bias for these drivers. |
| SENSE1+/–, SENSE2+/– (Pins 8,9 / 13,12) | Dual-phase current sense inputs | 63mV threshold per channel; Kelvin sensing required; RC filter mandatory to suppress switching noise. |
| RSET (Pin 7) | Oscillator frequency programming | Resistor to GND sets switching frequency (e.g., 80kΩ → 250kHz); also referenced by DCL and DELAY circuits. |
| DELAY (Pin 2) | Programmable BGATE turn-on delay | Adjusts timing offset between SGATE turn-off and BGATE turn-on to prevent cross-conduction in synchronous designs. |
| FB (Pin 13) | Voltage feedback input | Connects to resistor divider from VOUT; 2.44V internal reference enables precise output regulation (e.g., VOUT = 2.44×(1+RF1/RF2)). |
| GND / Exposed Pad (Pins 4, 28, 29) | Signal and thermal ground | All GND pins and exposed pad must be connected to low-impedance PCB ground plane; critical for EMI control and thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| 2-phase interleaved operation | Reduces input/output ripple current by ~70% vs single-phase, enabling smaller capacitors and lower EMI in high-power boost designs. |
| Programmable slope compensation | External resistor on SLOPE pin increases PWM ramp slope to suppress subharmonic oscillation in high-duty-cycle or high-noise applications. |
| Synchronous gate signal timing control | DELAY pin allows fine-tuning of dead-time between SGATE and BGATE edges to eliminate shoot-through with external driver propagation delays. |
| Tighter current sense mismatch | ±10mV max mismatch between channels (vs ±20mV in LT3782) improves current balance and thermal distribution in parallel-phase operation. |
| Thermally optimized QFN package | 4mm × 5mm footprint with exposed GND pad achieves θJA = 37°C/W - supports >4A continuous output in compact industrial layouts. |
Applications
| Telecom Power Supply | Industrial Battery Charger |
|---|---|
|
Use Scenario: 48V intermediate bus generation from 24V DC input in 5G base station power shelves. IC Role / Device Role / Timing Role: 2-phase boost controller managing dual 20µH inductors and Si7852DP MOSFETs to deliver regulated 50V/4A with <50mVpp output ripple. Use Value: Interleaving cuts output capacitor RMS current by >90% vs single-phase, allowing use of smaller 100µF ceramic + polymer hybrid instead of 470µF electrolytic. |
Use Scenario: On-board lithium-ion battery charger for factory automation AGVs requiring 29.4V–42V output from 24V vehicle bus. IC Role / Device Role / Timing Role: Configured with 300kHz switching and 75% duty clamp to safely boost 24V to 42V while maintaining stable current limiting during CC/CV transition. Use Value: Dual-phase current balancing ensures even thermal loading across MOSFETs, extending reliability in sealed, fanless enclosures. |
| Interleaved Isolated Flyback Bias | High-Voltage LED Driver |
|
Use Scenario: Generating 30V/100mA auxiliary bias supply for gate drivers in 1kW isolated DC/DC converters. IC Role / Device Role / Timing Role: Operates in discontinuous conduction mode (DCM) with 50% duty clamp to ensure stable startup and light-load regulation. Use Value: Programmable soft-start (SS pin) eliminates inrush current into transformer primary winding, preventing core saturation during cold start. |
Use Scenario: Driving 12-series white LED strings (36V nominal) from 12V automotive supply in commercial lighting fixtures. IC Role / Device Role / Timing Role: Controls dual 15µH inductors and 30BQ060 Schottky diodes to deliver constant 700mA with analog dimming via VC pin voltage. Use Value: 125°C junction rating and robust current sense architecture maintain ±3% LED current accuracy across –40°C to +85°C ambient. |
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 |
|---|---|---|---|
| LTC3780EUFD#PBF | Single-phase only; no interleaving; 4A integrated gate drivers; 4–36V input; 50V max output. | Suitable for lower-power (<2A) or space-constrained designs where interleaving benefits are unnecessary. | Select when board area is limited and output ripple requirements allow single-phase topology. |
| LT3758AEMSE#PBF | Single-phase, 100V input-rated controller; no integrated gate drivers; requires external drivers; supports SEPIC/boost/inverting. | Fits ultra-wide-input (12–100V) industrial systems needing fault tolerance beyond 36V. | Choose for high-input-voltage resilience and multi-topology flexibility, accepting added BOM count and layout complexity. |
Compared with LTC3780EUFD#PBF and LT3758AEMSE#PBF, the LT3782AIUFD#PBF uniquely delivers true 2-phase interleaving in a single IC with matched current sensing-enabling superior ripple reduction, thermal spreading, and power density in 3–5kW telecom and industrial boost stages without external phase synchronization circuitry.
Availability
LT3782AIUFD#PBF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial battery charging, and high-voltage LED driver applications requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to +125°C.
Supply support for LT3782AIUFD#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3782A product line was designed specifically for high-efficiency, high-power-density interleaved boost conversion in telecom and industrial power systems - emphasizing thermal robustness, precise current matching, and flexible synchronization for system-level power architecture integration.
FAQ
What is the maximum duty cycle supported by the LT3782AIUFD#PBF?
The LT3782AIUFD#PBF supports programmable maximum duty cycle clamping: grounding the DCL pin sets it to 50%, applying 1.2V to DCL sets it to 75%, and connecting DCL to RSET enables natural maximum duty cycle (~90% at RSET > 80kΩ). This prevents instability in high-VIN/VOUT ratio boost configurations and is confirmed in the Electrical Characteristics table under "Duty Cycle Limit".
Does the LT3782AIUFD#PBF integrate gate drivers for both high-side and low-side MOSFETs?
The LT3782AIUFD#PBF integrates dual 10V, 4A peak gate drivers (BGATE1/BGATE2) for low-side (main switch) MOSFETs only. High-side synchronous rectifier drive is provided via SGATE1/SGATE2 outputs, which require external gate drivers (e.g., LTC4446) - as explicitly stated in the Pin Functions section and Block Diagram.
How does the LT3782AIUFD#PBF achieve current balance between its two phases?
The LT3782AIUFD#PBF achieves current balance through matched current-sense amplifiers with ≤±10mV mismatch between SENSE1+/– and SENSE2+/– inputs (vs ±20mV in LT3782), combined with precise 180° interleaved timing controlled by internal D-flip-flop logic - both verified in the Electrical Characteristics table and Applications Information section.
What is the purpose of the DELAY pin on the LT3782AIUFD#PBF?
The DELAY pin on the LT3782AIUFD#PBF programs the time offset between SGATE turn-off and BGATE turn-on to prevent cross-conduction in synchronous rectifier designs. With DELAY tied to RSET, delay is fixed at ~100ns; adding a resistor divider allows adjustment up to 500ns - detailed in Figure 3 and Applications Information section.
Is the exposed thermal pad on the LT3782AIUFD#PBF electrically connected?
Yes - the exposed pad (Pin 29) on the LT3782AIUFD#PBF is internally connected to GND and must be soldered to the PCB ground plane to meet thermal specifications (θJA = 37°C/W) and ensure reliable operation at full load - as specified in both Absolute Maximum Ratings and Pin Configuration diagrams.
LT3782AIUFD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- 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):
- 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)
LT3782AIUFD#PBF FAQ
1.How can I place an order for LT3782AIUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3782AIUFD#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 LT3782AIUFD#PBF reliable?
The price and inventory of LT3782AIUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3782AIUFD#PBF is usually 5 days.
3.What payment methods are accepted for LT3782AIUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3782AIUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3782AIUFD#PBF?
LT3782AIUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3782AIUFD#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 LT3782AIUFD#PBF?
For technical support, including LT3782AIUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3782AIUFD#PBF requirements.
6.How does Aetrix verify that LT3782AIUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LT3782AIUFD#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 LT3782AIUFD#PBF meets industry standards.
7.What is the process for return or replacement of LT3782AIUFD#PBF?
All LT3782AIUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3782AIUFD#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 LT3782AIUFD#PBF part is unused and in its original packaging.
Return procedure for LT3782AIUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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