LT3782EFE#TRPBF - 2-Phase Boost DC/DC Controller, 500kHz | ADI
MPN: LT3782EFE#TRPBF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.48 | $9.48 |
| 10 | $8.74 | $87.40 |
| 100 | $7.65 | $765.00 |
| 500 | $6.88 | $3,440.00 |
| 1,000 | $6.21 | $6,210.00 |
LT3782EFE#TRPBF Overview
A two-phase boost controller is a current-mode switching regulator that interleaves two converter phases 180 degrees out of phase. This interleaving halves the input ripple current and doubles the effective switching frequency seen by the input filter, allowing the use of smaller magnetics and capacitors. The controller sits in the broader hierarchy of DC/DC converters -> switching regulators -> power management ICs -> semiconductors, and is the high-power counterpart to single-phase boost controllers when output currents exceed what a single phase can comfortably supply.
Key features include programmable switching frequency, selectable two-phase or single-phase operation, synchronizable oscillator, soft-start, and adaptive dead-time control for synchronous MOSFET applications. The 4 A peak gate-drive capability supports high-Ciss MOSFETs without external gate drivers, while the 10 V gate drive is compatible with standard threshold N-channel power MOSFETs. The TSSOP-EP package provides a thermal pad for improved heat dissipation and reliable operation at high switching currents.
The 2-phase topology reduces input RMS current by approximately 50% compared with single-phase equivalents at the same load, decreasing input capacitor stress and EMI. Adaptive dead-time control prevents cross-conduction in synchronous rectifier configurations. The internal soft-start and current-mode control simplify loop compensation and enable reliable step-up conversion from wide-input sources to high-output voltages required by industrial, automotive, and telecom systems.
Typical applications include high-power LED drivers, industrial 24 V to high-voltage DC bus conversion, automotive audio amplifier supplies, telecom -48V hold-up converters, and high-voltage bias generators for LCD backlights. The wide 6V-40V input tolerates load-dump and transients commonly encountered in industrial and automotive environments.
When designing with this device, ensure the exposed pad is soldered to a sufficiently large copper pour for thermal dissipation. Select the inductor and input capacitor based on the desynchronized ripple current of each phase. Use proper PCB layout to minimize switching-node area and reduce EMI.
Drop-in alternatives for LT3782EFE#TRPBF — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LT3782EFE#TRPBF (same form factor and footprint) — differing in Topology, RoHS Status, Number of Outputs, Operating Temperature Range, Output Voltage.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LT3782IFE#TRPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LT3782AIFE#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LT3782EFE#PBF
✅ Drop-In✓ In Stock
$7.52 / Unit
View Datasheet →LT3782EFE
✅ Drop-In✓ In Stock
$6.6 / Unit
View Datasheet →LT3758EMSE
✅ Drop-In✓ In Stock
$4.1 / Unit
View Datasheet →LT3782EFE#TRPBF Maximum Ratings & Electrical Characteristics
| Topology | Boost (Step-Up) |
| Number of Phases | 2 |
| Control Mode | Current Mode |
| Input Voltage Range | 6 V to 40 V |
| Switching Frequency (Max) | 500 kHz |
| Gate Drive Voltage | 10 V (VCC >= 13 V) |
| Peak Gate Drive Current | 4 A |
| Output Type | Transistor Driver (Controller) |
| Synchronous Rectifier Support | Yes (with adaptive dead-time) |
| Operating Temperature Range | -40 C to +125 C (TJ) |
| Package | TSSOP-28-EP (FE package designator) |
| Mounting Type | Surface Mount |
| MSL Level | 1 |
| RoHS Status | Compliant (TRPBF suffix) |
| Packaging | Tape & Reel |
LT3782EFE#TRPBF Pin Configuration
| Pin 1 | BOOST1 — Boosted gate drive for top-side N-channel MOSFET phase 1 |
| Pin 2 | TG1 — Top gate drive output, phase 1 |
| Pin 3 | SW1 — Switch node, phase 1 |
| Pin 4 | BG1 — Bottom gate drive output, phase 1 |
| Pin 5 | PGND — Power ground (return for gate drivers) |
| Pin 6 | SENSE+ — Current sense positive input |
| Pin 7 | SENSE- — Current sense negative input |
| Pin 8 | VCC — Gate driver supply (typically 13 V) |
| Pin 9 | VIN — Main input supply, 6 V to 40 V |
| Pin 10 | RUN — Run/enable input (logic-level) |
| Pin 11 | SS — Soft-start programming pin |
| Pin 12 | RT — Timing resistor for switching frequency |
| Pin 13 | SYNC — Oscillator synchronization input |
| Pin 14 | FB — Voltage feedback input |
| Pin 15 | COMP — Error amplifier compensation output |
| Pin 16 | GND — Signal ground |
| Pin 17 | PGND — Power ground |
| Pin 18 | BG2 — Bottom gate drive output, phase 2 |
| Pin 19 | SW2 — Switch node, phase 2 |
| Pin 20 | TG2 — Top gate drive output, phase 2 |
| Pin 21 | BOOST2 — Boosted gate drive for top-side N-channel MOSFET phase 2 |
| Pin 22 | VOUT — Output voltage sense |
| Pin 23 | NC — Not connected (per datasheet) |
| Pin 24 | NC — Not connected (per datasheet) |
| Pin 25 | NC — Not connected (per datasheet) |
| Pin 26 | NC — Not connected (per datasheet) |
| Pin 27 | NC — Not connected (per datasheet) |
| Pin 28 | NC — Not connected (per datasheet) |
Typical Applications
LT3782EFE#TRPBF is suitable for 6 applications: Industrial 24V to High-Voltage DC Bus Conversion, High-Power LED Driver Backlight, Automotive Audio Amplifier Power Supply, Telecom Hold-Up and Bias Converter, Industrial Battery Charger Front-End, High-Voltage Bias Generator for LCD/Plasma Displays.
Industrial 24V to High-Voltage DC Bus Conversion
The LT3782EFE#TRPBF excels at industrial 24 V bus to high-voltage DC rails. Its 6 V-40 V input window tolerates load-dump transients on 24 V industrial lines, while the 500 kHz switching frequency minimizes magnetic size. The 2-phase architecture cuts input ripple current by ~50% versus single-phase designs, easing input capacitor stress. With 4 A peak gate drive and 10 V VGS, it drives high-current N-channel MOSFETs directly for kilowatt-class industrial converters.
Recommended
High-Power LED Driver Backlight
For high-brightness LED backlights and projection systems, the LT3782EFE#TRPBF drives high-output-voltage strings (typically 30 V to 200 V) directly from 12 V or 24 V inputs. The 2-phase current-mode control delivers tight LED current regulation, while the 500 kHz switching frequency keeps magnetics small enough for slim display enclosures. Adaptive dead-time control optimizes synchronous rectifier efficiency, critical for thermal management in densely packed backlight units.
Recommended
Automotive Audio Amplifier Power Supply
The LT3782EFE#TRPBF supplies the high-voltage rails required by Class-D and Class-AB automotive audio amplifiers, stepping up 12 V battery voltage to the +/-24 V or higher rails required by premium amplifiers. Its 6 V-40 V input window survives cold-crank and load-dump events, while the 2-phase operation reduces EMI in the noise-sensitive audio band. The TSSOP-EP package supports the underhood thermal environment of automotive amplifier designs.
Recommended
Telecom Hold-Up and Bias Converter
In telecom -48 V hold-up converter architectures, the LT3782EFE#TRPBF operates on the post-ORing 36 V to 72 V DC bus, stepping down or up depending on hold-up state to generate intermediate bus rails. The 2-phase topology reduces input RMS current stress on bulk hold-up capacitors, extending hold-up time. The controller's wide input range and high gate-drive current handle the demanding transient response required during AC line dropouts.
Recommended
Industrial Battery Charger Front-End
For industrial battery charger front-ends, the LT3782EFE#TRPBF implements the high-voltage step-up stage required to charge 48 V, 96 V, or higher battery stacks from 24 V industrial supplies. Current-mode control simplifies closed-loop stability across the wide output voltage range required as battery cells go from depleted to full. The 4 A peak gate current supports high-current chargers at multi-kilowatt power levels for forklift and AGV batteries.
Recommended
High-Voltage Bias Generator for LCD/Plasma Displays
The LT3782EFE#TRPBF powers the high-voltage rails (typically 50 V to 200 V) required by LCD and plasma display panel drivers, stepping up from 12 V or 24 V system rails. The 2-phase architecture reduces input ripple that could otherwise couple into analog video circuitry, while the 500 kHz switching enables compact magnetic designs suitable for flat-panel enclosures. Soft-start and programmable frequency synchronize the boost with display timing for clean panel operation.
Recommended
Recommended Products Summary
Engineering reference data for LT3782EFE#TRPBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LT3782IFE#TRPBF | LT3782AIFE#PBF | LT3782EFE#PBF | LT3758EMSE |
|---|---|---|---|---|---|
| Package | TSSOP-28-EP | TSSOP-28-EP - same | TSSOP-28-EP - same | TSSOP-28-EP - same | MSOP-16EP (not pin-compatible, but in same TSSOP/EP family) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Topology | 2-Phase Boost | 2-Phase Boost | 2-Phase Boost (enhanced) | 2-Phase Boost | Single-Phase Boost |
| Input Voltage Range | 6 V to 40 V | 6 V to 40 V | 6 V to 40 V (extended VOUT range) | 6 V to 40 V | 5.5 V to 100 V |
| Switching Frequency (Max) | 500 kHz | 500 kHz | 500 kHz | 500 kHz | 500 kHz |
| Peak Gate Drive Current | 4 A | 4 A | 4 A | 4 A | 2 A |
| Temperature Grade | Extended (E) | Industrial (I) | Industrial (I), enhanced silicon | Extended (E) | Extended (E) |
| Packaging Format | Tape & Reel | Tape & Reel | Tube | Tube | Tube |
Key Differentiators
- 2-phase interleaved topology reduces input ripple by ~50% (vs Single-phase LT3758EMSE)
- Higher peak gate-drive current supports industrial MOSFETs directly (vs Single-phase LT3758EMSE (2 A peak))
- Enhanced 'A' variant option for higher VOUT applications (vs Standard LT3782 vs LT3782A variant)
Design Notes
The exposed thermal pad (EP) on the TSSOP-28-EP package MUST be soldered to a sufficient copper pour on the PCB - typically at least 1 square inch of 2 oz copper connected to the PGND plane. The TSSOP-EP package relies on this pad as the primary thermal conductor; without adequate copper, junction temperature will exceed safe limits at high gate-drive duty cycles. Recommended: connect EP to PGND with multiple thermal vias in a 3x3 grid pattern directly under the pad.
Minimize the switching-node (SW1, SW2) copper area to reduce radiated EMI. Use short, wide traces from the top-side MOSFET drains through the inductors, and keep the input ceramic capacitors within 5 mm of the VIN pin. The two phases should be routed symmetrically to balance the 180-degree interleaved operation; otherwise, ripple cancellation degrades. Use a star-ground topology tying PGND and signal GND at a single point near the IC.
Estimated: with VCC = 13 V, 2-phase operation at 500 kHz, and 50% duty cycle, gate-drive dissipation alone can reach roughly 0.5 W (Estimated: P_gate = 2 * Qg * Vgs * fsw for each phase, using typical Qg of 50 nC). Combined with quiescent current, total package dissipation is around 0.6 W. At ambient 85 C, this yields junction temperature near 110 C with proper EP soldering - within spec. Without EP soldering, expect 20-30 C additional rise.
Do not exceed VCC of 15 V - the LT3782 datasheet specifies 15 V as the absolute maximum on VCC. The BOOST pins must sit at least 5 V above SW for proper top-side gate drive; if BOOST capacitor charge is insufficient, the top-side MOSFET may not fully enhance. Place the BOOST diode and capacitor as close to the BOOST and SW pins as physically possible to avoid high dv/dt-induced ringing that can falsely trigger the top-side gate.
Compliance Information
TRPBF suffix indicates tape-and-reel (TR) and lead-free (PBF) finish. RoHS/REACH compliance confirmed by Analog Devices product page and LCSC distributor listing. Standard part is not AEC-Q100 qualified; automotive applications should review the LT3782 automotive-grade variants if available.
