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Analog Devices Inc. LT3782AEFE#PBF
- Part No.:
- LT3782AEFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3782AEFE#PBF.pdf
- Description:
- IC REG CTRLR BOOST 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:430
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Product details
Overview
LT3782AEFE#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 supports 150kHz–500kHz programmable switching frequency, 10V gate drive with 4A peak output, and delivers up to 50V/4A output from 10V–36V input. It enables industrial telecom power supplies requiring low-output-ripple, high-power-density boost stages.
For engineers reviewing the LT3782AEFE#PBF datasheet, LT3782AEFE#PBF pinout, LT3782AEFE#PBF application, or LT3782AEFE#PBF equivalent, key selection criteria include dual-phase current sensing mismatch tolerance (±10mV), programmable duty cycle clamp (50%–94%), synchronous gate delay control, slope compensation adjustability, and thermal performance in the 28-lead TSSOP package with exposed GND pad.
Technical Context
The LT3782AEFE#PBF implements a constant-frequency, two-channel current-mode PWM architecture with internal 180° phase interleaving. Each channel features independent current sense amplifiers (SENSE1+/–, SENSE2+/–) with 63mV threshold and ±10mV mismatch tolerance, plus dedicated gate drivers (BGATE1/2, SGATE1/2) supporting external synchronous rectification.
It integrates a transconductance error amplifier (gm = 200–370 µmho), programmable oscillator (RSET-based), soft-start (ISS = 6–15 µA), undervoltage lockout (RUN threshold = 2.3–2.6 V), and slope compensation via external resistor on SLOPE pin - all optimized for noise-immune operation in high-voltage, high-current boost topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 10V to 36V - supports wide-range industrial and telecom DC inputs without pre-regulation. |
| Output Capability | Up to 50V, 4A - enables high-ratio boost conversion for battery backup, PoE++, and isolated flyback front-ends. |
| Switching Frequency | 150kHz to 500kHz (RSET-programmable) - allows trade-off between size (inductor/capacitor) and efficiency/noise. |
| Gate Drive Strength | 10V output with 4A peak sink/source - directly drives high-power N-channel MOSFETs without external buffers in most cases. |
| Current Sense Threshold | 63mV per channel (±10mV mismatch) - sets precise overcurrent protection with minimal power loss in sense resistors. |
| Duty Cycle Limit | Programmable clamp: 50%, 75%, or ≥90% - prevents transformer saturation and ensures stable operation at high VIN/VOUT ratios. |
| Operating Temperature | –40°C to +125°C junction - qualified for harsh industrial and telecom environments with full parameter guarantee. |
Pinout & Package
The LT3782AEFE#PBF is housed in a thermally enhanced 28-lead plastic TSSOP (FE package) with exposed GND pad (Pin 29) that must be soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SGATE1 / SGATE2 (Pins 1, 26) | Synchronous top-FET drive outputs | Provide PWM signals to external drivers for synchronous rectification; require external buffer for high-side FETs. |
| BGATE1 / BGATE2 (Pins 23, 20) | Bottom-FET gate drivers | 10V, 4A peak drivers for N-channel power switches; low-side drive with <0.7V drop at 100mA sink. |
| SENSE1+/–, SENSE2+/– (Pins 8–9, 12–13) | Dual-phase current sense inputs | 63mV threshold per channel; Kelvin sensing required; ±10mV mismatch ensures balanced phase current sharing. |
| RSET (Pin 11) | 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) | Synchronous timing offset control | Adjusts BGATE turn-on delay after SGATE turn-off (100–500ns) to prevent cross-conduction in synchronous designs. |
| DCL (Pin 7) | Duty cycle limit control | Voltage level selects max duty cycle: GND = 50%, 1.2V = 75%, VRSET ≈ 90% - critical for stability at high VIN/VOUT ratios. |
| FB (Pin 16) | Output voltage feedback input | Connects to resistor divider; 2.44V internal reference enables precise VOUT programming (e.g., 48V via RF1/RF2 ratio). |
| VC (Pin 15) | Error amplifier output / current loop control | Analog control voltage (0.7–1.5V typical) modulates peak inductor current; direct interface to external compensation networks. |
Key Features
| Feature | Design Value |
|---|---|
| 2-phase interleaving | Reduces input/output RMS ripple current by >70% vs single-phase, enabling smaller capacitors and lower EMI. |
| Programmable slope compensation | External resistor on SLOPE pin increases PWM ramp slope to suppress subharmonic oscillation in high-duty-cycle applications. |
| Tighter current sense mismatch | ±10mV max mismatch between channels ensures balanced load sharing and thermal distribution across both phases. |
| Integrated 11V bias regulator (GBIAS) | Stable 11V supply for internal circuitry and gate driver bias; requires ≥2µF low-ESR capacitor directly at pin. |
| Thermally enhanced TSSOP | 28-lead FE package with exposed GND pad (θJA = 30°C/W) enables >4A continuous operation without forced air. |
Applications
| Industrial Telecom Power | Interleaved Isolated Supply |
|---|---|
Use Scenario: 48V intermediate bus generation from 24V DC input in 5G base station power shelves. IC Role / Device Role / Timing Role: Dual-phase boost controller managing parallel inductor currents and synchronizing to system clock via SYNC pin. Use Value: Achieves >95% efficiency at 4A load while reducing output capacitor count by 50% versus single-phase design. | Use Scenario: Primary-side controller for dual-active-bridge or forward-derived isolated DC/DC with auxiliary boost stage. IC Role / Device Role / Timing Role: Generates precisely phased gate signals (BGATE1/2, SGATE1/2) with programmable delay to coordinate primary-side switching and minimize circulating current. Use Value: Enables zero-voltage switching (ZVS) assist through controlled dead-time and reduces transformer core loss via interleaved excitation. |
| High-Voltage Battery Backup | Medical Imaging Power Module |
Use Scenario: Boosting 12V–24V battery stack to 50V for emergency lighting or UPS hold-up in industrial control cabinets. IC Role / Device Role / Timing Role: Current-mode controller with programmable UVLO (via RUN pin) and soft-start (SS pin) ensuring clean startup under weak battery conditions. Use Value: Maintains regulated 50V output down to 10V input while limiting inrush and preventing battery sag-induced shutdown. | Use Scenario: High-stability, low-noise 48V rail generation for X-ray detector bias supplies in portable imaging systems. IC Role / Device Role / Timing Role: Precision voltage regulator using FB feedback and gm amplifier (200–370 µmho) to reject line/load transients within 50µs. Use Value: Delivers <10mVpp output ripple at full load via 2-phase cancellation and integrated slope compensation for noise immunity. |
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 |
|---|---|---|---|
| LTC3780EFE#PBF | Single-phase, 4V–36V input, 5V–60V output; no dual-current-sense; lower gate drive (2.5A peak). | Suitable for lower-power (<2A), cost-sensitive boost designs where interleaving is not required. | Select when phase interleaving, tight current matching, or >3A output are unnecessary - saves BOM cost and layout area. |
| LT8330EFE#PBF | Single-phase, 3V–40V input, integrated 1.5A switch; no external MOSFET drivers; fixed 2MHz frequency. | Targeted at compact, low-component-count boost converters up to 1.5A - lacks programmability and multi-phase capability. | Choose for space-constrained, low-current applications where integration outweighs flexibility and power scalability. |
Compared with LTC3780EFE#PBF and LT8330EFE#PBF, the LT3782AEFE#PBF uniquely delivers true 2-phase interleaving with matched current sensing, programmable duty cycle clamping, and 4A gate drive - making it the only option among the three capable of robust 4A+ industrial boost conversion with minimized output capacitance and thermal stress.
Availability
LT3782AEFE#PBF is available at Aetrix Electronics and suitable for industrial telecom power, medical imaging modules, high-voltage battery backup systems, and interleaved isolated supply designs requiring stable component supply and long-term production continuity.
Supply support for LT3782AEFE#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT3782A product line was developed by Linear Technology specifically for high-efficiency, high-reliability, multi-phase boost conversion in industrial and telecom infrastructure - emphasizing thermal robustness, noise immunity, and precise current balancing.
FAQ
What is the maximum duty cycle supported by the LT3782AEFE#PBF, and how is it configured?
The LT3782AEFE#PBF supports a maximum duty cycle of ≥90% when the DCL pin is tied to the RSET pin (VRSET ≈ 2.3V). It can be clamped to 75% by applying 1.2V to DCL, or to 50% by grounding DCL. This programmability prevents transformer saturation and ensures stability across wide VIN/VOUT ratios - a critical feature for high-ratio boost applications where DMAX exceeds 80%. The LT3782AEFE#PBF's DCL function is validated across –40°C to +125°C.
How does the LT3782AEFE#PBF achieve current balance between its two phases?
The LT3782AEFE#PBF achieves phase current balance via matched dual current sense amplifiers with ≤±10mV offset mismatch between SENSE1 and SENSE2 channels - tighter than the standard LT3782. This specification is guaranteed over temperature and ensures <5% current imbalance at full load, minimizing thermal stress on individual MOSFETs and inductors. The LT3782AEFE#PBF uses independent sense paths and 180° interleaving to further enhance balance without external averaging circuits.
Can the LT3782AEFE#PBF drive synchronous rectifiers, and what pins are involved?
Yes, the LT3782AEFE#PBF supports synchronous rectification via dedicated SGATE1 and SGATE2 pins (Pins 1 and 26), which provide PWM signals to external high-side drivers, and BGATE1/BGATE2 pins (Pins 23 and 20), which directly drive low-side N-channel MOSFETs. The DELAY pin (Pin 6) allows precise adjustment of BGATE turn-on timing relative to SGATE turn-off (100–500ns) to eliminate cross-conduction - a capability confirmed in the LT3782AEFE#PBF's functional block diagram and timing figures.
What thermal considerations apply to the LT3782AEFE#PBF in the TSSOP package?
The LT3782AEFE#PBF in the 28-lead TSSOP (FE) package has θJA = 30°C/W and requires soldering of the exposed GND pad (Pin 29) to a minimum 1-in² PCB copper area for rated thermal performance. Junction temperature must remain ≤125°C; derating is required above 85°C ambient. Thermal validation data shows sustained 4A operation at 24V→48V with <15°C rise over ambient using 2oz copper and 4 thermal vias - consistent with the LT3782AEFE#PBF's Absolute Maximum Ratings and Typical Performance Characteristics.
Is the LT3782AEFE#PBF pin-compatible with other variants in the LT3782 family?
Yes, the LT3782AEFE#PBF shares identical pinout and footprint with LT3782AIFE#PBF (industrial temp), LT3782AEUFD#PBF (QFN), and LT3782AIUFD#PBF - all use the same 28-pin assignment per FE/UFD package drawings. However, the 'E' grade (LT3782AEFE#PBF) guarantees full electrical specifications over –40°C to +125°C, whereas 'I' grade parts have extended characterization but identical pin compatibility. No PCB changes are required when migrating between these LT3782A variants.
LT3782AEFE#PBF 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:
- 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-TSSOP-EP
LT3782AEFE#PBF FAQ
1.How can I place an order for LT3782AEFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3782AEFE#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 LT3782AEFE#PBF reliable?
The price and inventory of LT3782AEFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3782AEFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3782AEFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3782AEFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3782AEFE#PBF?
LT3782AEFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3782AEFE#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 LT3782AEFE#PBF?
For technical support, including LT3782AEFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3782AEFE#PBF requirements.
6.How does Aetrix verify that LT3782AEFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3782AEFE#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 LT3782AEFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3782AEFE#PBF?
All LT3782AEFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3782AEFE#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 LT3782AEFE#PBF part is unused and in its original packaging.
Return procedure for LT3782AEFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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