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Analog Devices Inc. LT3782EFE#TRPBF
- Part No.:
- LT3782EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3782EFE#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,783
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Product details
Overview
LT3782EFE#TRPBF 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 at up to 500kHz switching frequency, delivers 10V gate drive with 4A peak source/sink capability, supports 6V–40V input range, and targets industrial power supplies requiring reduced input/output capacitance and thermal management via phase interleaving.
For engineers reviewing the LT3782EFE#TRPBF datasheet, LT3782EFE#TRPBF pinout, LT3782EFE#TRPBF application, or LT3782EFE#TRPBF equivalent, key selection criteria include programmable duty cycle clamp (50% or higher), synchronous gate signal timing control with falling-edge delay, slope compensation adjustability, and dual-phase current sensing with 60mV threshold per channel.
Technical Context
The LT3782EFE#TRPBF implements constant-frequency current-mode control across two interleaved phases with precise 180° phase offset enforced by internal D-flip-flop logic. Its transconductance error amplifier (200–370 μmho) regulates output voltage via FB pin feedback against a 2.42–2.488V reference, while dual independent current sense amplifiers monitor SENSE1+/– and SENSE2+/– with 60mV overcurrent threshold.
Switching frequency is set by RSET-to-GND resistor (150–500kHz range), and synchronization is supported via SYNC pin accepting 180–715kHz external clock (operating frequency = half sync frequency). Gate drivers BGATE1/BGATE2 deliver 10.2–11.7V bias (GBIAS-regulated) and 3–4A peak current into >22μF capacitive loads, with SGATE1/SGATE2 providing synchronous top-FET drive signals featuring programmable delay relative to BGATE turn-off.
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 - adjustable via RSET resistor; higher frequencies reduce passive 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 - enables fast turn-on/turn-off of high-Qg industrial MOSFETs, minimizing conduction and switching losses. |
| Current Sense Threshold | 60mV per channel - sets accurate overcurrent protection point; requires Kelvin-connected sense resistors for precision. |
| Reference Voltage | 2.42V to 2.488V - tight tolerance enables stable output regulation; used with FB divider to program VOUT = 2.44 × (1 + RF1/RF2). |
| Duty Cycle Clamp | 50%, 75%, or ≥90% - selectable via DCL pin voltage; prevents instability at high VIN/VOUT ratios and limits peak inductor current. |
| Operating Temperature | –40°C to +85°C - qualified for industrial ambient conditions; exposed pad (Pin 29) must be soldered to PCB ground for thermal performance. |
Pinout & Package
LT3782EFE#TRPBF is housed in a thermally enhanced 28-lead plastic TSSOP package (FE package) with exposed pad (Pin 29) fused to internal ground and requiring soldering to PCB ground plane for optimal thermal dissipation (θJA = 38°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SGATE1 (Pin 1) | Synchronous top-FET drive signal, Phase 1 | Drives external high-side driver for synchronous rectification; requires buffer stage before connecting to MOSFET gate. |
| SGATE2 (Pin 2) | Synchronous top-FET drive signal, Phase 2 | 180° out-of-phase with SGATE1; enables interleaved synchronous operation to reduce output ripple. |
| GND (Pin 4) | Signal ground reference | Primary analog/digital ground return; connects to PCB ground plane and exposed pad (Pin 29). |
| SYNC (Pin 5) | External clock synchronization input | Accepts 0.8–2V pulse; device switching frequency equals half the sync frequency (e.g., 400kHz sync → 200kHz operation). |
| DELAY (Pin 6) | Programmable BGATE turn-on delay control | Adjusts dead-time between SGATE turn-off and BGATE turn-on to prevent cross-conduction in synchronous designs. |
| DCL (Pin 7) | Duty cycle limit programming input | Voltage level selects max duty cycle: GND = 50%, 1.2V = 75%, VRSET ≈ 2.3V = ≥90%. |
| SENSE1+ / SENSE1– (Pins 8,9) | Phase 1 current sense differential inputs | 60mV threshold triggers current limit; RC filter required across sense resistor to reject switching noise. |
| SLOPE (Pin 10) | Internal slope compensation adjustment | Resistor to GND increases PWM ramp slope, improving noise immunity in high-dV/dt boost applications. |
| RSET (Pin 11) | Oscillator frequency setting | Resistor to GND sets charging current; determines switching frequency (e.g., 80kΩ → 250kHz). |
| SENSE2– / SENSE2+ (Pins 12,13) | Phase 2 current sense differential inputs | Independent 60mV overcurrent detection per phase; enables balanced current sharing in interleaved design. |
| SS (Pin 14) | Soft-start timing capacitor connection | Capacitor value sets output ramp time: t ≈ (C × 2.44V)/10μA; prevents inrush current during startup. |
| VC (Pin 15) | Error amplifier output / current loop control | 0.7V threshold initiates switching; voltage level directly controls peak inductor current per phase. |
| FB (Pin 16) | Feedback voltage input | Connects to resistor divider from VOUT; regulates output using 2.44V internal reference. |
| RUN (Pin 17) | Enable/shutdown control | 2.3–2.6V threshold enables operation; <0.3V forces low-current shutdown mode (≤0.65μA). |
| VEE1 (Pin 19) | Phase 1 bottom-FET driver ground | Must connect to ground side of Phase 1 current sense resistor to avoid measurement error. |
| BGATE1 (Pin 20) | Phase 1 bottom-FET gate driver output | Drives N-channel MOSFET source-switched configuration; 4A peak sink/source into capacitive load. |
| GBIAS2 (Pin 21) | Phase 2 gate driver bias supply | Internally regulated 11V output; connects to GBIAS1 and GBIAS; requires ≥2μF low-ESR bypass capacitor. |
| GBIAS1 (Pin 22) | Phase 1 gate driver bias supply | Tied to GBIAS2; provides stable 11V bias for BGATE1 under varying load and temperature. |
| BGATE2 (Pin 23) | Phase 2 bottom-FET gate driver output | Matches BGATE1 specs; enables independent control of second boost phase for interleaving. |
| VEE2 (Pin 24) | Phase 2 bottom-FET driver ground | Must connect to ground side of Phase 2 current sense resistor; separates sense return paths. |
| VCC (Pin 27) | Main IC supply input | Accepts 6–40V; requires local ceramic bypass (≥1μF) close to pin; powers internal circuitry except gate drivers. |
| GBIAS (Pin 28) | Internal 11V regulator output | Supplies bias to internal logic and connects to GBIAS1/GBIAS2; not intended as system power rail. |
| Exposed Pad (Pin 29) | Thermal pad / internal AGND | Mandatory solder connection to PCB ground plane; primary thermal path; improves θJA by >30%. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved control | Reduces input/output RMS ripple current by up to 70% vs single-phase, enabling smaller bulk capacitors and lower EMI. |
| Programmable synchronous gate delay | Prevents shoot-through in external synchronous rectifier designs via adjustable BGATE turn-on timing relative to SGATE turn-off. |
| Configurable duty cycle clamp | Three-level clamp (50%/75%/≥90%) avoids subharmonic oscillation and limits peak inductor current in high-gain boost applications. |
| Adjustable slope compensation | External RSLOPE resistor increases internal PWM ramp slope, enhancing noise immunity in high-voltage/high-current boost converters. |
| Independent dual current sensing | Separate SENSE1+/– and SENSE2+/– inputs enable precise per-phase current limiting and balanced power sharing in 2-phase layout. |
| Thermally enhanced TSSOP | 28-lead FE package with exposed pad achieves θJA = 38°C/W - critical for sustained 4A output designs without heatsinks. |
Applications
| Industrial Telecom Power Supply | Interleaved Isolated Boost Converter |
|---|---|
Use Scenario: 48V telecom rectifier feeding distributed 50V/4A intermediate bus in base station equipment. IC Role / Device Role / Timing Role: Two-phase boost controller managing parallel inductor banks, synchronizing to system clock to minimize conducted EMI. Use Value: 2-phase operation cuts output capacitor RMS ripple current by ~90% at 50% duty cycle, allowing 3× reduction in 220μF electrolytic count versus single-phase. |
Use Scenario: Primary-side boost stage in isolated flyback or forward converter with >100W output and strict input ripple requirements. IC Role / Device Role / Timing Role: Interleaved controller driving two transformer-primary windings with 180° phase shift to cancel magnetizing current ripple. Use Value: Input ripple cancellation reduces EMI filter size by 40% and enables use of smaller, lower-ESR input ceramics instead of bulk aluminum electrolytics. |
| High-Voltage LED Driver | 2-Phase Battery Boost System |
Use Scenario: Driving 50V string of high-brightness LEDs from 12V automotive battery with minimal thermal stress on pass components. IC Role / Device Role / Timing Role: Constant-current boost controller using FB feedback with current-sense resistor in LED return path; duty cycle clamped to prevent overvoltage. Use Value: Programmable 60mV current limit ensures ±3% LED current accuracy across temperature; 500kHz operation allows <10μH inductors for compact form factor. |
Use Scenario: Boosting 24V Li-ion battery pack to 48V for motor drive or PoE++ infrastructure in portable industrial tools. IC Role / Device Role / Timing Role: Dual-phase controller balancing load between two battery strings while maintaining tight output regulation under dynamic load steps. Use Value: Independent SENSE1+/– and SENSE2+/– inputs enable real-time per-string current monitoring and automatic derating if one cell group degrades. |
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 |
|---|---|---|---|
| LTC3780EFE#TRPBF | Single-phase architecture; no interleaving; lower max frequency (400kHz); integrated 7V gate drivers (vs 10V on LT3782). | Not suitable for high-current (>3A) or low-ripple applications where interleaving is mandatory; better for cost-sensitive, space-constrained single-phase designs. | Select only when phase interleaving is unnecessary and gate drive voltage ≤7V suffices for chosen MOSFETs. |
| LT3782AIFE#TRPBF | Improved phase matching accuracy (<10ns skew vs >20ns on LT3782); same pinout and electrical specs; rated for –40°C to +125°C junction. | Required for new designs targeting extended temperature operation or tighter current balance between phases (e.g., medical or aerospace). | Preferred for all new designs; LT3782EFE#TRPBF is not recommended for new designs per manufacturer guidance. |
Compared with LTC3780EFE#TRPBF, LT3782EFE#TRPBF delivers true interleaving and higher gate drive for robust high-power boost, while LT3782AIFE#TRPBF offers superior phase alignment and extended temperature rating - making the original LT3782EFE#TRPBF best suited for legacy industrial systems operating within 0°C–85°C ambient.
Availability
LT3782EFE#TRPBF is available at Aetrix Electronics and suitable for industrial telecom power supplies, interleaved isolated power supplies, and high-voltage LED drivers requiring stable component supply and long-term production continuity.
Supply support for LT3782EFE#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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for legacy Linear power products.
The LT3782 product line was developed specifically for high-efficiency, high-current interleaved boost conversion in industrial and telecom infrastructure, emphasizing thermal performance, noise immunity, and flexible synchronization.
FAQ
What is the maximum recommended operating junction temperature for LT3782EFE#TRPBF?
The absolute maximum junction temperature for LT3782EFE#TRPBF is 125°C, with continuous operation above this threshold impairing reliability. The device incorporates overtemperature protection that activates above 125°C, but sustained operation should remain below 125°C. Thermal design must ensure θJA ≤38°C/W via proper exposed pad soldering to a large PCB ground plane.
Can LT3782EFE#TRPBF drive synchronous rectifiers directly without external drivers?
No, LT3782EFE#TRPBF cannot drive synchronous rectifiers directly. SGATE1 and SGATE2 outputs are logic-level signals intended for external high-current gate drivers (e.g., LTC4444, ISL6612), while BGATE1 and BGATE2 drive bottom N-channel MOSFETs directly. Direct connection of SGATE pins to MOSFET gates risks insufficient drive strength and shoot-through due to propagation delays.
How does the DCL pin affect maximum duty cycle in LT3782EFE#TRPBF?
The DCL pin on LT3782EFE#TRPBF selects three fixed maximum duty cycle limits: grounding DCL sets 50%, applying 1.2V sets 75%, and connecting to VRSET (~2.3V) enables natural limit ≥90%. This clamp prevents subharmonic oscillation in high-gain boost configurations (e.g., VIN=12V → VOUT=48V) and protects against excessive peak inductor current during transient events.
Is LT3782EFE#TRPBF pin-compatible with LT3782A variants?
Yes, LT3782EFE#TRPBF is pin-compatible with LT3782AIFE#TRPBF and LT3782AEFE#TRPBF - same 28-lead TSSOP footprint, identical pin functions, and backward-compatible electrical specifications. However, LT3782A offers improved phase matching (<10ns skew) and extended temperature rating, making it the recommended replacement for new designs.
What is the purpose of the SLOPE pin on LT3782EFE#TRPBF, and how is it configured?
The SLOPE pin on LT3782EFE#TRPBF adjusts internal PWM ramp slope compensation to improve noise immunity in high-dV/dt boost applications. A resistor RSLOPE from SLOPE to GND increases slope magnitude; smaller RSLOPE values yield stronger compensation. Minimum RSLOPE is RFREQ/2, and typical values range from 20kΩ to 100kΩ depending on switching frequency and layout noise susceptibility.
LT3782EFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) 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, Reset, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT3782EFE#TRPBF FAQ
1.How can I place an order for LT3782EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3782EFE#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 LT3782EFE#TRPBF reliable?
The price and inventory of LT3782EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3782EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3782EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3782EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3782EFE#TRPBF?
LT3782EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3782EFE#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 LT3782EFE#TRPBF?
For technical support, including LT3782EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3782EFE#TRPBF requirements.
6.How does Aetrix verify that LT3782EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3782EFE#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 LT3782EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3782EFE#TRPBF?
All LT3782EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3782EFE#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 LT3782EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3782EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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