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Analog Devices Inc. LT3782IFE
- Part No.:
- LT3782IFE
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3782IFE.pdf
- Description:
- IC REGULATOR
- Quantity:
- Payment:
- Shipping:
Inventory:3,508
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Product details
Overview
LT3782IFE 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 from 6V to 40V input, delivers up to 50V/4A output, supports programmable switching frequency from 150kHz to 500kHz, features dual 10V/4A gate drivers, and targets industrial power supplies requiring reduced input/output capacitance and thermal management. It is used in telecom infrastructure and isolated power systems.
For engineers reviewing the LT3782IFE datasheet, LT3782IFE pinout, LT3782IFE application, or LT3782IFE equivalent, key selection considerations include its 28-lead TSSOP package with exposed thermal pad, –40°C to 125°C operating junction temperature range, programmable duty cycle clamp (50%–94%), synchronous gate signal delay control, and slope compensation for noise immunity in high-voltage boost designs.
Technical Context
The LT3782IFE implements constant-frequency current-mode control with two independent 180° out-of-phase PWM channels, each using a transconductance error amplifier (200–370 μmho), 60mV current-sense threshold, and internal slope compensation adjustable via external resistor. Its oscillator is set by RSET (e.g., 80kΩ → 250kHz), and internal clock runs at twice the switching frequency due to 2-phase interleaving.
It integrates dual high-side N-channel MOSFET drivers (BGATE1/BGATE2) with 10.2–11.7V bias (GBIAS), 4A peak source/sink capability, and programmable turn-on delay relative to synchronous gate signals (SGATE1/SGATE2). Shutdown is controlled via RUN pin (2.3–2.6V threshold, 80mV hysteresis), and undervoltage lockout is programmable via resistor divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 40V - supports wide industrial input rails including 12V, 24V, and 36V systems without pre-regulation. |
| Switching Frequency | 150kHz to 500kHz - programmable via RSET; higher frequencies reduce magnetics size but increase switching loss. |
| Gate Drive Voltage | 10.2V to 11.7V (GBIAS) - sufficient to fully enhance standard 10V-rated N-channel MOSFETs in high-power boost stages. |
| Peak Gate Drive Current | 4A per channel - enables fast turn-on of high-Qg industrial MOSFETs (e.g., Si7852DP) with minimal rise time. |
| Current Sense Threshold | 60mV per phase - sets precise overcurrent limit; requires Kelvin-connected sense resistors for accuracy. |
| Duty Cycle Clamp | 50% to ≥90% - configurable via DCL pin voltage; prevents instability at high VIN/VOUT ratios (e.g., 12V→50V). |
| Junction Temperature Range | –40°C to 125°C - rated for harsh industrial environments; requires exposed pad soldering for θJA = 38°C/W. |
Pinout & Package
The LT3782IFE is housed in a thermally enhanced 28-lead plastic TSSOP package (FE) with exposed ground pad (Pin 29) that must be soldered to PCB for thermal and electrical performance. Package dimensions: 9.7mm × 4.4mm × 1.1mm.
| 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 | 10V, 4A peak drivers directly control low-side N-MOSFETs; GBIAS1/GBIAS2 pins supply bias voltage. |
| SENSE1± / SENSE2± (Pins 8–9, 12–13 / 4–5, 8–10) | Current sense differential inputs | 60mV threshold per phase; RC filter required across sense resistor to reject switching noise. |
| RSET (Pin 11 / Pin 7) | Oscillator frequency programming | Resistor to GND sets switching frequency (e.g., 80kΩ → 250kHz); also used as reference for DCL and DELAY functions. |
| DELAY (Pin 6 / Pin 2) | Programmable BGATE turn-on delay | Adjusts timing offset between SGATE turn-off and BGATE turn-on to prevent cross-conduction in synchronous operation. |
| DCL (Pin 7 / Pin 3) | Duty cycle limit control | Voltage level selects max duty cycle: GND = 50%, 1.2V = 75%, VRSET ≈ 90% - critical for stability at high gain ratios. |
| FB (Pin 16 / Pin 13) | Output voltage feedback input | Connects to resistor divider from VOUT; references internal 2.44V bandgap for precise output regulation. |
| RUN (Pin 17 / Pin 14) | Enable/shutdown control | 2.45V threshold with 80mV hysteresis; <0.3V forces ultra-low-IQ shutdown mode. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved operation | Reduces input/output RMS ripple current by ~70% vs single-phase, enabling smaller capacitors and lower EMI. |
| Programmable slope compensation | External RSLOPE resistor increases internal ramp slope to suppress subharmonic oscillation in high-noise, high-duty-cycle boost applications. |
| Synchronous gate signal delay | Configurable 100–500ns delay between SGATE turn-off and BGATE turn-on avoids shoot-through when using external high-speed drivers. |
| Thermally enhanced TSSOP | Exposed pad (Pin 29) tied to GND provides low-thermal-resistance path; mandatory soldering ensures θJA ≤ 38°C/W. |
| Wide temperature grade | Specified over –40°C to 125°C junction range - qualified for industrial and telecom base station environments. |
Applications
| Telecom Power Supply | Industrial Motor Drive Bias |
|---|---|
Use Scenario: Generating stable 48V or 50V intermediate bus from 24V or 36V battery or rectified AC input in 4G/5G base station RF power amplifiers. IC Role / Device Role / Timing Role: Two-phase boost controller managing interleaved power stage timing, current sensing, and gate drive sequencing for efficiency and thermal distribution. Use Value: 2-phase operation cuts output capacitor RMS ripple current by >90% at 50% duty cycle, reducing bulk capacitor count and board area by ~40% versus single-phase. | Use Scenario: Providing regulated 50V/4A auxiliary supply for gate drivers and logic in servo motor inverters operating from 24V–48V DC bus. IC Role / Device Role / Timing Role: High-current step-up controller delivering tightly regulated output with programmable soft-start and current limiting to protect downstream IGBT/MOSFET drivers. Use Value: 4A peak gate drive and 10V bias enable direct driving of high-Qg power device drivers without external buffers, simplifying BOM and layout. |
| Interleaved Isolated DC-DC Front-End | High-Voltage Test Equipment Supply |
Use Scenario: Primary-side boost stage feeding an isolation transformer in medical or industrial isolated power modules requiring >1kW output with low EMI. IC Role / Device Role / Timing Role: Dual-channel current-mode controller synchronizing two boost phases to minimize transformer magnetizing current imbalance and core loss. Use Value: Programmable 180° phase shift and matched current loops ensure balanced power sharing between phases, improving transformer utilization and thermal uniformity. | Use Scenario: Generating precise, low-noise 50V bias for analog front-ends and HV op-amps in automated test equipment (ATE) with strict ripple and stability requirements. IC Role / Device Role / Timing Role: Precision-controlled boost regulator using FB feedback and VC loop compensation to maintain ±0.5% output regulation under dynamic load steps. Use Value: 2.44V reference with <±2mV drift over temperature and gm amplifier (200–370 μmho) enable tight line/load regulation (<1%) without external compensation. |
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 |
|---|---|---|---|
| LTC3780 | Single-phase synchronous boost controller; no interleaving; 4A integrated gate drivers; 4–36V input; 5V–36V output. | Not suitable for >36V output or high-ripple-sensitive applications; lacks 2-phase current balancing and phase delay control. | Select LTC3780 only for simpler, lower-output-voltage designs where interleaving benefits are unnecessary. |
| LT3757A | Single-phase boost/half-bridge controller; 100V input rating; 10V/2A gate drivers; no built-in 2-phase logic or SGATE outputs. | Supports higher input voltages (up to 100V) but requires external circuitry for interleaving; less integrated for dual-phase timing. | Choose LT3757A when input exceeds 40V or when custom 2-phase implementation with discrete timing is acceptable. |
Compared with LTC3780 and LT3757A, the LT3782IFE uniquely integrates native 2-phase interleaving, programmable phase delay, and dual 4A gate drivers - making it the only option among the three capable of delivering 50V/4A with minimized output capacitance and thermal stress in a single IC.
Availability
LT3782IFE is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motor drive bias, and interleaved isolated power supply designs requiring stable component supply, extended temperature operation, and long-term production continuity.
Supply support for LT3782IFE 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 legacy Linear parts including the LT3782 series.
The LT3782 product line was designed specifically for high-efficiency, high-current, two-phase interleaved boost conversion in industrial and telecom power systems where thermal density and EMI reduction are critical.
FAQ
What is the maximum output voltage achievable with the LT3782IFE?
The LT3782IFE itself does not impose a hard output voltage limit; instead, it regulates based on the FB resistor divider and internal 2.44V reference. In published typical applications, it delivers 50V at 4A. The practical maximum depends on external components - especially MOSFET BVDSS rating, diode PIV, and output capacitor voltage rating. For reliable 50V operation, use ≥63V-rated output capacitors and ≥80V-rated MOSFETs to accommodate ringing and transient overshoot. The LT3782IFE has been validated in 50V/4A boost designs with >93% efficiency at full load.
Does the LT3782IFE support synchronization to an external clock?
Yes, the LT3782IFE supports external synchronization via the SYNC pin (Pin 5/Pin 1). A TTL- or CMOS-compatible clock signal with 10%–70% duty cycle and ≥1.2V rising-edge threshold can lock the internal oscillator. Because the LT3782IFE operates in 2-phase mode, its switching frequency equals half the SYNC frequency. For example, applying a 400kHz sync signal results in 200kHz per phase. The SYNC input also includes a 200ns one-shot timer to tolerate narrow pulses, enhancing robustness in noisy systems.
How is the duty cycle limited on the LT3782IFE, and why is this important?
The LT3782IFE uses the DCL pin (Pin 7/Pin 3) to clamp maximum duty cycle: grounding DCL sets 50%, applying 1.2V sets 75%, and connecting to RSET sets ≥90%. This is critical for stability in high-gain boost converters (e.g., 12V→50V, D ≈ 76%). Without clamping, excessive duty cycle can cause subharmonic oscillation or current runaway. The DCL function works in conjunction with slope compensation and current-mode control to maintain loop stability across wide input/output ranges - a key differentiator from basic boost controllers.
Can the LT3782IFE drive synchronous rectifiers, and how is shoot-through prevented?
Yes, the LT3782IFE provides dedicated SGATE1/SGATE2 outputs (Pins 1/2 and 26/27) to drive external high-side synchronous FETs, while BGATE1/BGATE2 (Pins 23/20 and 22/17) drive low-side switches. Shoot-through is prevented by programmable delay: the DELAY pin (Pin 6/Pin 2) controls the time between SGATE turn-off and BGATE turn-on. With DELAY tied to RSET, delay is ~100ns; adding a resistor divider allows adjustment up to 500ns. This ensures dead-time insertion even with fast external gate drivers, eliminating cross-conduction risk.
What thermal design requirements apply to the LT3782IFE package?
The LT3782IFE in 28-lead TSSOP (FE) requires soldering of the exposed pad (Pin 29) to a minimum 200mm² copper thermal plane for effective heat dissipation. With proper layout, θJA is 38°C/W. Junction temperature must stay ≤125°C; at 125°C ambient and 1.5W dissipation, the pad-to-plane thermal path dominates. Avoid thermal relief on the pad - use solid copper connection and ≥6 thermal vias (0.3mm diameter) to inner ground layers. Failure to solder the exposed pad risks exceeding TJMAX during sustained 4A output, triggering thermal shutdown and intermittent operation.
LT3782IFE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT3782IFE FAQ
1.How can I place an order for LT3782IFE through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3782IFE 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 reliable?
The price and inventory of LT3782IFE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3782IFE is usually 5 days.
3.What payment methods are accepted for LT3782IFE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3782IFE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3782IFE?
LT3782IFE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3782IFE 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?
For technical support, including LT3782IFE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3782IFE requirements.
6.How does Aetrix verify that LT3782IFE is sourced from the original manufacturer or authorized distributors?
All LT3782IFE 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 meets industry standards.
7.What is the process for return or replacement of LT3782IFE?
All LT3782IFE units undergo pre-shipment inspection (PSI). If there is an issue with LT3782IFE, 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 part is unused and in its original packaging.
Return procedure for LT3782IFE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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