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Analog Devices Inc. LT3782AIFE
- Part No.:
- LT3782AIFE
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3782AIFE.pdf
- Description:
- IC REGULATOR
- Quantity:
- Payment:
- Shipping:
Inventory:4,210
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Product details
Overview
LT3782AIFE 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 operates from 10V to 36V input, delivers up to 50V/4A output, supports programmable switching frequency (150–500kHz), and features dual 10V/4A peak gate drivers with programmable falling-edge delay for synchronous MOSFET control. It is used in telecom power supplies and industrial isolated DC/DC converters requiring reduced input/output ripple.
For engineers reviewing the LT3782AIFE datasheet, LT3782AIFE pinout, LT3782AIFE application, or LT3782AIFE equivalent, key selection criteria include its 2-phase interleaved architecture, tight current-sense mismatch tolerance (±10mV), programmable duty cycle clamp (50–94%), thermal-enhanced 28-lead TSSOP package with exposed GND pad, and compatibility with external synchronous gate drivers via SGATE1/SGATE2 signals.
Technical Context
The LT3782AIFE implements constant-frequency current-mode control with two independent PWM channels operating 180° out-of-phase, reducing input/output capacitor stress. Its transconductance error amplifier regulates output voltage via FB pin (2.44V reference), while VC pin serves as the current-loop control node (0.7V startup threshold).
It integrates dual high-current gate drivers (BGATE1/BGATE2) with 10V bias (GBIAS-regulated), programmable slope compensation (SLOPE pin), soft-start (SS pin, 10µA current source), and undervoltage lockout (RUN pin, 2.44V threshold with 80mV hysteresis). The 28-lead TSSOP package includes dedicated VEE1/VEE2 grounds and exposed thermal pad (Pin 29 = GND).
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 boost stages for PoE, battery charging, and isolated flyback primary drives. |
| Switching Frequency | 150kHz to 500kHz - adjustable via RSET resistor; higher frequencies reduce magnetics size but increase switching loss. |
| Gate Drive Strength | 10V output, 4A peak sink/source - directly drives high-power N-channel MOSFETs without external buffers in many cases. |
| Current Sense Threshold | 63mV per phase (±10mV mismatch) - sets precise overcurrent protection with minimal sense resistor power loss. |
| Duty Cycle Limit | Programmable 50% / 75% / ≥90% - prevents transformer saturation and ensures stable operation under low-VIN conditions. |
| Operating Temperature | –40°C to +125°C junction - qualified for harsh industrial and telecom environments with full parameter guarantee. |
Pinout & Package
LT3782AIFE is housed in a thermally enhanced 28-lead plastic TSSOP (FE package) with exposed GND pad (Pin 29). The package requires soldering of the exposed pad to PCB ground plane for rated thermal performance (θJA = 30°C/W).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 27) | IC Power Supply Input | Accepts 6V–40V; powers internal circuitry and gate drivers; requires local 2µF low-ESR bypass capacitor. |
| RUN (Pin 17) | Enable/Shutdown Control | 2.44V threshold with 80mV hysteresis; <0.3V forces ultra-low-quiescent shutdown (≤0.65µA). |
| FB (Pin 16) | Error Amplifier Inverting Input | Connects to resistor divider from VOUT; 2.44V reference sets output voltage: VOUT = 2.44 × (1 + RF1/RF2). |
| VC (Pin 15) | Current-Mode PWM Control Node | gm amplifier output; 0.7V minimum to initiate switching; higher voltage increases inductor current command. |
| SENSE1+/SENSE1– (Pins 8/9) SENSE2+/SENSE2– (Pins 13/12) |
Dual Phase Current Sense Inputs | 63mV threshold per channel; RC filter required across sense resistor to reject switching noise. |
| BGATE1/BGATE2 (Pins 23/20) | Bottom-Side MOSFET Gate Drivers | 10V, 4A peak drive; drives N-channel switches in boost low-side position; VEE1/VEE2 must be shorted to GND near IC. |
| SGATE1/SGATE2 (Pins 1/2) | Synchronous Rectifier Gate Signals | Open-drain outputs for external high-side driver control; require external buffer for top-FET drive. |
| DELAY (Pin 6) | Programmable BGATE Turn-On Delay | Adjusts timing between SGATE turn-off and BGATE turn-on (100–500ns) to prevent cross-conduction in synchronous designs. |
| GND (Pins 4, 28, 29) | Signal & Thermal Ground | Pin 29 is exposed pad - must be soldered to PCB ground plane; all GND pins should tie together near IC. |
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. |
| Tighter Current Sense Mismatch | ±10mV max mismatch between phases - improves current sharing accuracy and system reliability in parallel operation. |
| Programmable Slope Compensation | External resistor on SLOPE pin increases internal ramp - suppresses subharmonic oscillation in high-duty-cycle applications. |
| Synchronous Gate Signal Timing Control | Delay pin allows precise adjustment of BGATE1/BGATE2 turn-on relative to SGATE1/SGATE2 - eliminates shoot-through risk. |
| Thermally Optimized TSSOP Package | 28-lead FE package with exposed GND pad achieves θJA = 30°C/W - supports 4A continuous output without heatsink in typical layouts. |
Applications
| Telecom Power Supply | Industrial Isolated DC/DC |
|---|---|
|
Use Scenario: 48V telecom rectifier feeding distributed 54V intermediate bus in base station equipment. IC Role / Device Role / Timing Role: 2-phase boost controller generating regulated 54V from 36–72V input range with <1% output regulation. Use Value: Interleaving cuts output capacitor RMS current by ~90%, allowing use of fewer 105°C-rated aluminum electrolytics and extending lifetime. |
Use Scenario: Primary-side controller for isolated forward or flyback converter in factory automation PLC power module. IC Role / Device Role / Timing Role: High-voltage boost stage preceding isolation transformer; provides stable 300–400V bus from 24V/48V industrial rail. Use Value: 50V/4A capability and 125°C rating enable compact, convection-cooled design meeting IEC 61000-4 immunity requirements. |
| High-Voltage Battery Charger | LED Driver for Street Lighting |
|
Use Scenario: Charging 48V LiFePO₄ battery stack from 24V vehicle alternator with bidirectional capability. IC Role / Device Role / Timing Role: Boost controller regulating charge voltage/current via FB and current sense feedback; RUN pin enables/disables based on battery state. Use Value: Programmable soft-start (SS pin) prevents inrush into large battery capacitance; duty cycle clamp avoids instability at low VIN. |
Use Scenario: Constant-current LED driver powering 100W+ streetlight arrays from 12–36V DC input. IC Role / Device Role / Timing Role: High-efficiency boost controller delivering 60–120V constant current to series-connected LEDs. Use Value: Dual-phase operation minimizes output ripple, eliminating visible LED flicker; 125°C rating supports enclosed outdoor fixture operation. |
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 |
|---|---|---|---|
| LT3782EFE#TRPBF | Same die, –40°C to +85°C temperature grade; looser current sense mismatch (±15mV vs ±10mV). | Not qualified for extended industrial ambient (>85°C); unsuitable where full 125°C junction operation is required. | Select LT3782AIFE when operating in high-ambient environments or where tighter current matching is critical for redundancy. |
| LT3758AIFE#TRPBF | Single-phase boost controller; same 10V/4A gate drive, 2.44V reference, and 125°C rating; lacks interleaving and second phase pins. | Cannot achieve same ripple reduction or power density; requires larger input/output caps and higher peak currents. | Choose LT3758AIFE only if single-phase topology suffices and board space constraints prohibit dual-phase layout. |
Compared with LT3782EFE#TRPBF and LT3758AIFE#TRPBF, the LT3782AIFE uniquely combines guaranteed 125°C operation, tighter current-sense matching, and native 2-phase interleaving-enabling higher power density, lower thermal stress, and improved reliability in mission-critical telecom and industrial systems.
Availability
LT3782AIFE 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 guaranteed parametric performance across –40°C to +125°C.
Supply support for LT3782AIFE 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 industrial, automotive, communications, and healthcare markets.
The LT3782AIFE belongs to Linear's high-voltage DC/DC controller product line, engineered specifically for efficient, reliable, and thermally robust interleaved boost conversion in demanding industrial and telecom applications.
FAQ
What is the maximum allowable input voltage for the LT3782AIFE?
The LT3782AIFE has an absolute maximum VCC rating of 40V, but its specified operating input voltage range is 10V to 36V. Exceeding 36V may cause premature wear or violate guaranteed performance specs, even if below the 40V absolute limit. For 40V-tolerant designs, consider transient clamping or input pre-regulation. The LT3782AIFE datasheet specifies 36V as the upper end of its guaranteed functional range.
How does the LT3782AIFE differ from the standard LT3782 in terms of current sensing?
The LT3782AIFE features tighter current sense mismatch tolerance (±10mV) compared to the base LT3782 (±15mV), ensuring more accurate current balancing between its two phases. This improvement enhances reliability in redundant or paralleled power stages and reduces thermal imbalance under load. All other electrical characteristics and pinouts remain identical between LT3782AIFE and LT3782IFE.
Can the LT3782AIFE operate in single-phase mode?
Yes, the LT3782AIFE can be configured for single-phase operation by leaving SENSE2+, SENSE2–, BGATE2, SGATE2, VEE2, and GBIAS2 unconnected and tying DCL to RSET for natural duty cycle. However, doing so forfeits interleaving benefits - including reduced input/output ripple, lower RMS currents, and improved thermal distribution - which are core advantages of the LT3782AIFE's dual-phase architecture.
What is the purpose of the exposed pad (Pin 29) on the LT3782AIFE TSSOP package?
The exposed pad (Pin 29) on the LT3782AIFE is electrically and thermally connected to GND. It must be soldered to a PCB copper pour tied to system ground to achieve the specified θJA = 30°C/W thermal resistance. Failure to solder this pad degrades thermal performance significantly - potentially raising junction temperature by >40°C under full load - and risks violating the 125°C TJMAX rating.
Is the LT3782AIFE pin-compatible with the LT3782EFE or LT3782IFE variants?
Yes, the LT3782AIFE is fully pin-compatible with LT3782EFE and LT3782IFE in the same 28-lead TSSOP (FE) package. All share identical pinout, footprint, and electrical interface. The "A" suffix denotes tighter current-sense mismatch and full –40°C to +125°C guaranteed operation, while "E" and "I" grades differ only in temperature qualification scope - no layout changes are needed when upgrading from EFE or IFE to AIFE.
LT3782AIFE 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, Frequency Control, Reset, Soft Start
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT3782AIFE FAQ
1.How can I place an order for LT3782AIFE through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3782AIFE 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 LT3782AIFE reliable?
The price and inventory of LT3782AIFE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3782AIFE is usually 5 days.
3.What payment methods are accepted for LT3782AIFE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3782AIFE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3782AIFE?
LT3782AIFE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3782AIFE 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 LT3782AIFE?
For technical support, including LT3782AIFE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3782AIFE requirements.
6.How does Aetrix verify that LT3782AIFE is sourced from the original manufacturer or authorized distributors?
All LT3782AIFE 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 LT3782AIFE meets industry standards.
7.What is the process for return or replacement of LT3782AIFE?
All LT3782AIFE units undergo pre-shipment inspection (PSI). If there is an issue with LT3782AIFE, 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 LT3782AIFE part is unused and in its original packaging.
Return procedure for LT3782AIFE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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