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Analog Devices Inc. LT3782EFE
- Part No.:
- LT3782EFE
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3782EFE.pdf
- Description:
- IC REGULATOR
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT3782EFE from Analog Devices (formerly Linear Technology) is a current-mode, two-phase step-up DC/DC controller IC designed for high-efficiency interleaved boost conversion. It operates at up to 500kHz switching frequency, delivers 10V gate drive with 4A peak source/sink capability, and supports programmable duty cycle clamp (≥50%), slope compensation, and synchronous rectifier timing control. It is used in telecom infrastructure power supplies requiring reduced input/output capacitance and thermal management.
For engineers reviewing the LT3782EFE datasheet, LT3782EFE pinout, LT3782EFE application, or LT3782EFE equivalent, key selection criteria include its 2-phase interleaved architecture, 6V–40V input range, 28-lead TSSOP package with exposed thermal pad, and compatibility with external high-power N-channel MOSFETs in industrial and telecom boost converters.
Technical Context
The LT3782EFE implements dual-channel current-mode PWM control with precise 180° phase separation, enabling ripple cancellation and reduced filter component stress. Its transconductance error amplifier (200–370 μmho) regulates output voltage via FB pin feedback against a 2.42–2.488V reference, while independent SENSE1+/– and SENSE2+/– inputs monitor per-phase inductor current with 60mV current limit threshold.
It integrates dual 10V gate drivers (BGATE1/BGATE2) capable of 4A peak drive into capacitive loads >50μF, plus programmable SGATE1/SGATE2 signals with adjustable falling-edge delay (100–500ns) to prevent cross-conduction in synchronous rectifier configurations using external drivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 40V - supports wide industrial and telecom input rails including 12V, 24V, and 36V systems. |
| Switching Frequency | 150kHz to 500kHz - set by RSET resistor; enables compact magnetics and EMI optimization. |
| Gate Drive Capability | 10V output with 4A peak source/sink - directly drives high-power N-MOSFETs without external buffers in most cases. |
| Current Limit Threshold | 60mV across sense resistor - sets per-phase overcurrent protection with Kelvin-sense compatibility. |
| Reference Voltage | 2.42V to 2.488V - tight tolerance enables accurate output voltage programming (e.g., VOUT = 2.44 × (1 + RF1/RF2)). |
| Max Duty Cycle | 90% (natural), clamped to 50% or 75% via DCL pin - prevents instability at high VIN/VOUT ratios. |
| Operating Temp Range | –40°C to +85°C - specified performance for commercial/industrial ambient conditions. |
Pinout & Package
The LT3782EFE is housed in a thermally enhanced 28-lead plastic TSSOP (FE package) with exposed ground pad (Pin 29) that must be soldered to PCB for thermal and electrical integrity. θJA = 38°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| SGATE2 (1) | Synchronous top-FET drive signal (Phase 2) | Drives external buffer for high-side synchronous rectifier; requires programmable delay relative to BGATE2. |
| SGATE1 (2) | Synchronous top-FET drive signal (Phase 1) | Drives external buffer for high-side synchronous rectifier; 180° out-of-phase with SGATE2. |
| GND (4) | Signal ground reference | Primary ground return for internal circuitry and exposed pad connection point. |
| SYNC (5) | External clock synchronization input | Accepts 0.8–2V pulses; device switching frequency equals half the SYNC frequency. |
| DELAY (6) | Programmable BGATE turn-on delay control | Adjusts timing offset between SGATE fall and BGATE rise to avoid cross-conduction in synchronous designs. |
| DCL (7) | Duty cycle clamp control | Ground = 50% max duty; VRSET = ~90%; 1.2V = 75% - prevents subharmonic oscillation at high duty ratios. |
| SENSE1+ (8) | Phase 1 current sense positive input | Connects to high side of current sense resistor; 60mV threshold triggers current limit. |
| SENSE1– (9) | Phase 1 current sense negative input | Connects to low side of current sense resistor; RC filter required for noise immunity. |
| SLOPE (10) | Internal slope compensation adjustment | Resistor to GND increases ramp compensation to suppress subharmonic oscillation in high-noise environments. |
| RSET (11) | Oscillator frequency setting | Resistor to GND sets charging current; determines switching frequency (e.g., 80kΩ = 250kHz). |
| SENSE2– (12) | Phase 2 current sense negative input | Matches SENSE1– function for second channel; requires identical RC filtering. |
| SENSE2+ (13) | Phase 2 current sense positive input | Matches SENSE1+ function for second channel; 60mV threshold applies identically. |
| SS (14) | Soft-start timing capacitor node | Capacitor value sets output ramp time: t ≈ (C × 2.44V)/10μA. |
| VC (15) | Error amplifier output / current loop control | 0.7V threshold initiates switching; higher VC increases peak inductor current per phase. |
| FB (16) | Voltage feedback input | Resistor divider from VOUT sets regulation point using 2.44V internal reference. |
| RUN (17) | Enable/shutdown control | 2.45V threshold enables operation; 0.3V forces low-current shutdown; 80mV hysteresis built-in. |
| VEE2 (19) | Phase 2 gate driver ground return | Must connect to ground side of Phase 2 current sense resistor for accurate sensing. |
| BGATE2 (20) | Phase 2 bottom-FET gate driver output | 10V, 4A capable; drives N-MOSFET source-connected switch in boost topology. |
| GBIAS2 (21) | Phase 2 gate driver bias supply | Connected to GBIAS or external 12–14V supply; bypassed with ≥2μF low-ESR capacitor. |
| GBIAS1 (22) | Phase 1 gate driver bias supply | Connected to GBIAS2; shares same bias rail as Phase 2 driver. |
| BGATE1 (23) | Phase 1 bottom-FET gate driver output | 10V, 4A capable; matches BGATE2 specs and timing behavior. |
| VEE1 (24) | Phase 1 gate driver ground return | Must connect to ground side of Phase 1 current sense resistor. |
| VCC (27) | Main IC power supply | 6–40V input; requires local ceramic bypassing near pin; powers internal logic and regulators. |
| GBIAS (28) | Internal 11V regulator output | Supplies internal circuitry and connects to GBIAS1/GBIAS2; must be bypassed externally. |
| Exposed Pad (29) | Thermal and electrical ground | Fused to die AGND; mandatory solder connection to PCB ground plane for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved control | Reduces input/output RMS ripple current by up to 70%, enabling smaller bulk capacitors and lower EMI. |
| Programmable slope compensation | External resistor on SLOPE pin increases internal ramp slope to maintain stability under high-noise conditions. |
| Synchronous rectifier timing control | SGATE/DELAY interface allows precise dead-time tuning to eliminate shoot-through in external synchronous FET designs. |
| Wide-input, high-voltage boost capability | 6V–40V input range and 90% max duty cycle support output voltages up to 50V+ in telecom and industrial applications. |
| Thermally optimized TSSOP package | 28-lead FE package with exposed pad achieves θJA = 38°C/W - critical for continuous 4A gate drive operation. |
Applications
| Telecom Power Supply | Industrial DC-DC Boost |
|---|---|
Use Scenario: 48V intermediate bus generation from 24V or 36V input in base station power modules. IC Role / Device Role / Timing Role: Two-phase boost controller managing parallel inductor currents with 180° phase shift to minimize input ripple and thermal stress. Use Value: Enables 50V/4A output with <10% output ripple using only 220μF total output capacitance due to interleaving. | Use Scenario: High-reliability 24V-to-48V boost converter in factory automation PLC power rails. IC Role / Device Role / Timing Role: Current-mode controller with programmable UVLO (via RUN divider) and soft-start (SS pin) for controlled system startup under variable load. Use Value: 6V–40V input range accommodates brownout conditions; 4A gate drive supports discrete 100V MOSFETs without external drivers. |
| Interleaved Isolated Supply | High-Efficiency LED Driver |
Use Scenario: Primary-side controller for isolated flyback or forward converter with auxiliary boost stage for gate drive bias. IC Role / Device Role / Timing Role: Generates regulated high-voltage bias (e.g., 15V) for optocoupler or digital isolator drivers using synchronous rectification. Use Value: SGATE/DELAY timing control ensures safe dead-time in synchronous rectifier stage, improving efficiency by >3% vs diode-based solutions. | Use Scenario: Constant-current boost driver for high-brightness LED strings in outdoor signage or street lighting. IC Role / Device Role / Timing Role: Regulates LED current via FB pin with current-sense amplifier feedback; uses DCL pin to limit max duty cycle during dimming transients. Use Value: 60mV current limit threshold provides precise per-phase current matching across 2-phase design, ensuring uniform LED brightness. |
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, no interleaving; 4V–36V input; integrated 5V LDO bias; no SGATE/DELAY pins. | Lower cost for non-interleaved designs; lacks ripple cancellation and dual-phase current balancing. | Select LTC3780 only when input/output ripple requirements allow single-phase operation and gate drive needs are ≤2A. |
| LT3758A | Single-phase boost/buck-boost controller; 2.5V–100V input; no dual-phase or interleaving logic; different pinout and feature set. | Supports wider input range and buck-boost topology but cannot replace LT3782EFE's 2-phase interleaved function. | Choose LT3758A only for high-input-voltage (>40V) or buck-boost applications where phase interleaving is unnecessary. |
Compared with LTC3780 and LT3758A, the LT3782EFE uniquely delivers true 2-phase interleaved control with dedicated SGATE/DELAY timing, making it irreplaceable for applications demanding minimized input/output capacitance, thermal derating, and high-current boost conversion above 3A.
Availability
LT3782EFE is available at Aetrix Electronics and suitable for telecom infrastructure, industrial equipment, and interleaved isolated power supply designs requiring stable component supply and long-term production continuity.
Supply support for LT3782EFE 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 technical and manufacturing continuity for legacy Linear power products.
The LT3782EFE belongs to Linear's high-performance DC/DC controller family, engineered specifically for high-efficiency, high-current, interleaved boost conversion in space-constrained industrial and telecom power systems.
FAQ
What is the maximum operating junction temperature for the LT3782EFE?
The LT3782EFE has a maximum junction temperature (TJMAX) of 125°C. Its thermal resistance θJA is 38°C/W in the 28-lead TSSOP package. To maintain reliability, ensure the exposed pad (Pin 29) is fully soldered to a PCB ground plane, and verify board-level thermal design meets derating requirements across the –40°C to +85°C ambient range. The LT3782EFE includes overtemperature protection that activates above TJMAX.
Can the LT3782EFE drive synchronous rectifiers without external gate drivers?
No - the LT3782EFE does not integrate high-side gate drivers for synchronous rectifiers. Its SGATE1 and SGATE2 pins provide low-current PWM signals intended to drive external gate driver ICs (e.g., LTC4446, ISL6612A). BGATE1 and BGATE2 drive bottom-switch N-MOSFETs directly, but SGATE outputs require buffering to achieve sufficient current and voltage swing for top-FET gate control in synchronous boost stages.
How is the switching frequency set on the LT3782EFE?
The switching frequency of the LT3782EFE is set by an external resistor (RFREQ) connected from the RSET pin (Pin 11) to ground. For example, an 80kΩ resistor sets 250kHz operation. The device's internal oscillator runs at twice the switching frequency due to its 2-phase architecture. Frequency versus RSET is documented in the Typical Performance Characteristics graph (Figure 3782 G04) in the datasheet.
What is the purpose of the DELAY pin on the LT3782EFE?
The DELAY pin (Pin 6) on the LT3782EFE programs the turn-on delay of BGATE1/BGATE2 relative to the turn-off of SGATE1/SGATE2 in synchronous rectifier configurations. This prevents cross-conduction between top and bottom FETs. When shorted to RSET, it yields ~100ns delay; a resistor divider adjusts VDELAY to extend delay up to 500ns, accommodating propagation delays of external gate drivers.
Is the LT3782EFE pin-compatible with the LT3782A?
No - the LT3782EFE and LT3782A are not pin-compatible. While both share the same 28-lead TSSOP footprint and core functionality, the LT3782A introduces improved phase-matching circuitry and updated internal timing characteristics. Analog Devices explicitly recommends the LT3782A for new designs, indicating functional enhancements that preclude direct substitution without validation. Always consult the respective datasheets before replacement.
LT3782EFE 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 ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT3782EFE FAQ
1.How can I place an order for LT3782EFE through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3782EFE 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 LT3782EFE reliable?
The price and inventory of LT3782EFE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3782EFE is usually 5 days.
3.What payment methods are accepted for LT3782EFE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3782EFE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3782EFE?
LT3782EFE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3782EFE 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 LT3782EFE?
For technical support, including LT3782EFE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3782EFE requirements.
6.How does Aetrix verify that LT3782EFE is sourced from the original manufacturer or authorized distributors?
All LT3782EFE 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 LT3782EFE meets industry standards.
7.What is the process for return or replacement of LT3782EFE?
All LT3782EFE units undergo pre-shipment inspection (PSI). If there is an issue with LT3782EFE, 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 LT3782EFE part is unused and in its original packaging.
Return procedure for LT3782EFE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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