My Inquiry
My Account
Analog Devices Inc. LT3782AIUFD#TRPBF
- Part No.:
- LT3782AIUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT3782AIUFD#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,547
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3782AIUFD#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 delivers up to 50V/4A output from 10V–36V input, operates at 150kHz–500kHz switching frequency, features dual 10V/4A 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#TRPBF datasheet, LT3782AIUFD#TRPBF pinout, LT3782AIUFD#TRPBF application, or LT3782AIUFD#TRPBF equivalent, key selection criteria include its 2-phase interleaving capability, ±10mV current sense mismatch tolerance, 180° phase shift control, programmable falling-edge delay for synchronous rectifier timing, and thermal performance in the 4mm × 5mm QFN package with exposed GND pad.
Technical Context
The LT3782AIUFD#TRPBF implements a constant-frequency, current-mode PWM architecture with two independent control loops synchronized via internal D-flip-flop logic to maintain precise 180° phase separation. Its transconductance error amplifier regulates output voltage via FB pin feedback against a 2.44V reference, while dual current-sense amplifiers monitor SENSE1± and SENSE2± with 63mV threshold and matched gain.
It integrates dual high-current gate drivers (BGATE1/BGATE2) capable of 4A peak sourcing/sinking, programmable soft-start via SS pin (10µA current source), and configurable maximum duty cycle clamping (50%–94%) through DCL pin voltage. The device supports external synchronization (fSYNC = 2×fSW) and includes built-in undervoltage lockout on RUN pin with 80mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 10V to 36V - supports wide industrial and telecom input rails without pre-regulation. |
| Output Capability | 50V, 4A - enables high-voltage intermediate bus generation in distributed power architectures. |
| Switching Frequency | 150kHz to 500kHz - adjustable via RSET resistor; higher frequencies reduce passive size but increase switching loss. |
| Current Sense Threshold | 63mV per channel - sets overcurrent limit; ±10mV mismatch ensures balanced phase current sharing. |
| Gate Drive Strength | 10V output, 4A peak - drives high-power N-channel MOSFETs directly without external buffers in most cases. |
| Max Duty Cycle | 94% (RSET = 40kΩ) - supports high step-up ratios (e.g., 12V→50V) with minimal dropout margin. |
| Operating Temp Range | –40°C to +125°C - qualified for industrial and telecom base station environments. |
Pinout & Package
LT3782AIUFD#TRPBF is housed in a thermally enhanced 28-lead (4mm × 5mm) plastic QFN package with exposed GND pad (Pin 29), requiring soldering to PCB ground plane for thermal and electrical integrity.
| 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 FET gate drive. |
| BGATE1 / BGATE2 (Pins 20, 23 / 17, 22) | Bottom-FET gate drivers | 10V, 4A peak drivers for N-channel boost switches; VEE1/VEE2 must be tied to local ground near each driver. |
| SENSE1± / SENSE2± (Pins 4, 5 / 8, 10) | Dual current sense inputs | Accept Kelvin-connected sense resistors; 63mV threshold enables accurate per-phase current limiting and balancing. |
| RSET (Pin 7) | Oscillator frequency programming | Resistor to GND sets switching frequency (e.g., 80kΩ → 250kHz); also serves as reference for DCL and DELAY circuits. |
| DELAY (Pin 2) | Programmable BGATE turn-on delay | Adjusts delay between SGATE turn-off and BGATE turn-on (100–500ns) to prevent cross-conduction in synchronous designs. |
| DCL (Pin 3) | Duty cycle clamp control | Voltage level selects max duty cycle: GND = 50%, 1.2V = 75%, VRSET ≈ 90% - critical for stability at high step-up ratios. |
| FB (Pin 13) | Feedback input | Connects to resistor divider from VOUT; 2.44V reference enables precise output voltage setting (e.g., VOUT = 2.44×(1+RF1/RF2)). |
| RUN (Pin 14) | Enable/shutdown control | 2.44V threshold with 80mV hysteresis; <0.3V forces ultra-low-IQ shutdown mode for system-level power sequencing. |
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 filtering requirements. |
| Programmable slope compensation | External resistor on SLOPE pin increases internal ramp slope to suppress subharmonic oscillation in high-duty-cycle or high-noise applications. |
| Tighter current sense mismatch | ±10mV max mismatch (vs LT3782's ±20mV) ensures balanced load sharing between phases under transient and steady-state conditions. |
| Thermally optimized QFN package | 4mm × 5mm footprint with exposed GND pad (θJA = 37°C/W) supports >4A continuous output in compact layouts without forced air. |
| Integrated 11V bias regulator (GBIAS) | Stable 11V rail powers internal circuitry and can bias GBIAS1/GBIAS2 pins; requires ≥2µF low-ESR ceramic capacitor directly at pin. |
Applications
| Telecom Intermediate Bus | Industrial 48V Boost Supply |
|---|---|
Use Scenario: Generating stable 48V/3A from 24V battery backup in 5G remote radio units. IC Role / Device Role / Timing Role: 2-phase boost controller managing interleaved inductor currents and synchronizing gate timing across two high-power MOSFET pairs. Use Value: Reduces output capacitor RMS ripple by >90% at 50% duty cycle, enabling use of smaller, longer-life polymer capacitors instead of large electrolytics. |
Use Scenario: Powering PLC I/O modules requiring regulated 50V from variable 12–36V industrial DC bus. IC Role / Device Role / Timing Role: Dual-channel current-mode controller enforcing matched phase current and precise 180° phase offset for ripple cancellation. Use Value: Achieves >93% efficiency at full load (12V→50V/4A) with no external gate drivers needed due to integrated 4A peak drive capability. |
| Interleaved Isolated Flyback Bias | High-Voltage Test Equipment Supply |
Use Scenario: Providing isolated 36V bias for gate drivers in 1kV SiC half-bridge inverters. IC Role / Device Role / Timing Role: Interleaved boost stage feeding transformer primary; SGATE/DELAY pins coordinate synchronous rectifier timing to minimize conduction loss. Use Value: Programmable 100–500ns BGATE delay prevents shoot-through during transition, improving reliability in high dv/dt isolation barriers. |
Use Scenario: Lab-grade 50V/4A bench supply with low-noise, fast transient response for semiconductor characterization. IC Role / Device Role / Timing Role: Precision-controlled 2-phase controller with 2.44V reference and <1% FB input current enabling tight output regulation (<±0.5%). Use Value: Soft-start (SS pin) and programmable current limit allow controlled ramp-up and repeatable overcurrent protection during device under test (DUT) stress testing. |
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 |
|---|---|---|---|
| LTC3780IUFD#PBF | Single-phase, 4V–36V input, 6A peak drive, no interleaving or phase delay control. | Lacks 2-phase current balancing and programmable SGATE-BGATE delay; suitable only for lower-power or non-interleaved designs. | Select when 2-phase ripple reduction is unnecessary and board space is constrained - uses same QFN package but simpler layout. |
| LT3758AEMSE#TRPBF | Single-phase, 2.5V–100V input, 1.5A gate drive, no dual-channel sensing or DCL pin. | Supports wider VIN range but lacks phase interleaving, current mismatch tolerance, and duty cycle clamping - not drop-in for LT3782A designs. | Choose for ultra-high step-up (e.g., 5V→80V) where 2-phase benefits are secondary to input range; requires redesign of gate drive and sensing. |
Compared with LTC3780IUFD#PBF and LT3758AEMSE#TRPBF, the LT3782AIUFD#TRPBF uniquely delivers matched dual-phase control with <±10mV current sense mismatch, programmable inter-phase timing delay, and 50–94% duty cycle clamping - making it the only option for high-current, low-ripple, thermally constrained 2-phase boost applications.
Availability
LT3782AIUFD#TRPBF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and high-reliability power supply designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT3782AIUFD#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT3782A product line was developed specifically for high-efficiency, high-current, interleaved boost conversion in space-constrained industrial and communications systems - emphasizing thermal robustness, phase matching, and noise-immune current sensing.
FAQ
What is the maximum achievable output voltage and current using the LT3782AIUFD#TRPBF?
The LT3782AIUFD#TRPBF is specified to support up to 50V output at 4A continuous current when operating from a 10V–36V input. This capability is enabled by its 10V/4A gate drivers, 94% maximum duty cycle, and dual-phase current handling. Actual output depends on external components (inductor saturation current, MOSFET RDS(ON), capacitor ratings) and thermal design - the 4mm × 5mm QFN package with exposed pad must be properly soldered to a thermal plane to sustain 4A output at full load.
How does the LT3782AIUFD#TRPBF achieve current matching between its two phases?
The LT3782AIUFD#TRPBF achieves current matching via tighter current sense amplifier mismatch specification: ±10mV maximum difference between SENSE1 and SENSE2 thresholds (vs ±20mV for LT3782). This is combined with precise 180° phase alignment enforced by internal D-flip-flop logic and matched propagation delays in the PWM paths. The result is balanced per-phase current sharing under both steady-state and transient conditions, critical for thermal management and ripple cancellation.
Can the LT3782AIUFD#TRPBF operate without external synchronous MOSFET drivers?
Yes - the LT3782AIUFD#TRPBF can drive bottom N-channel MOSFETs directly via BGATE1/BGATE2 pins (10V, 4A peak), eliminating need for external drivers in many applications. However, SGATE1/SGATE2 pins are intended for driving external gate drivers for top synchronous FETs; they are not rated for direct MOSFET connection. For fully synchronous operation, external drivers are required on SGATE lines, while BGATE lines may drive MOSFETs directly if gate charge and layout permit.
What is the role of the DELAY pin on the LT3782AIUFD#TRPBF, and how is it configured?
The DELAY pin on the LT3782AIUFD#TRPBF programs the time interval between SGATE turn-off and BGATE turn-on to prevent cross-conduction in synchronous rectifier configurations. When shorted to RSET, it provides ~100ns default delay; a resistor divider from RSET to GND sets VDELAY (0.25V–1V) to adjust delay from 100ns to 500ns. This timing control is essential for safe operation with external gate drivers having variable propagation delays, ensuring dead-time optimization without compromising efficiency.
Does the LT3782AIUFD#TRPBF support external clock synchronization, and what are the constraints?
Yes - the LT3782AIUFD#TRPBF supports external synchronization via the SYNC pin. The applied sync frequency must be exactly twice the desired switching frequency (fSYNC = 2×fSW). Valid sync range is 180kHz–715kHz depending on RSET value. Pulse width must be 10%–70%, and rising-edge threshold is 1.2V. To avoid instability, fSW must be set below 80% of the system clock frequency - e.g., for 200kHz system clock, configure fSW ≤ 160kHz and fSYNC = 400kHz.
LT3782AIUFD#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)
LT3782AIUFD#TRPBF FAQ
1.How can I place an order for LT3782AIUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3782AIUFD#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 LT3782AIUFD#TRPBF reliable?
The price and inventory of LT3782AIUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3782AIUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3782AIUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3782AIUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3782AIUFD#TRPBF?
LT3782AIUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3782AIUFD#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 LT3782AIUFD#TRPBF?
For technical support, including LT3782AIUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3782AIUFD#TRPBF requirements.
6.How does Aetrix verify that LT3782AIUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3782AIUFD#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 LT3782AIUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3782AIUFD#TRPBF?
All LT3782AIUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3782AIUFD#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 LT3782AIUFD#TRPBF part is unused and in its original packaging.
Return procedure for LT3782AIUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3782AIUFD#TRPBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
