LT3782EFE - 2-Phase Step-Up DC/DC Controller | Analog Devices
N.º de pieza: LT3782EFE ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $9.53 | $9,53 |
| 10 | $8.62 | $86,20 |
| 100 | $7.81 | $781,00 |
| 500 | $7.15 | $3.575,00 |
| 1.000 | $6.6 | $6.600,00 |
LT3782EFE Descripción general
A boost converter controller is a power management IC that drives external N-channel MOSFETs and inductors to step a lower input voltage up to a higher regulated output. Unlike monolithic regulators, a controller integrates only the PWM control loop, error amplifier, and gate drivers, so the power stage is external and scalable to very high output power. In the hierarchy of power management ICs, the LT3782EFE sits at the top of the power range: switching controller -> switching regulator -> voltage regulator.
The LT3782EFE's defining feature is 2-phase interleaved operation: two boost power stages switch 180 degrees out of phase, which cancels input and output ripple currents and reduces required filtering capacitance and inductance. This directly lowers BOM cost, board area, and output ripple. Because phase interleaving doubles effective switching frequency at the terminals, output ripple voltage shrinks for a given capacitor bank.
Technically, the LT3782 uses a current mode architecture with a transconductance (gm) error amplifier regulating the output voltage and commanding the PWM current loop. The datasheet block diagram shows PWM logic and flip-flops, two high-speed gate drivers rated for 10 V gate drive and 4 A peak current, and 2-phase control signals capable of driving most industrial-grade high-power MOSFETs with high efficiency. The 10 V gate drive (VCC >= 13 V) fully enhances standard industrial MOSFETs, minimizing RDS(ON) losses at high current.
Typical applications include industrial 24 V to 48 V bus step-up supplies, high-power telecom and battery-backup boost converters, and automotive or heavy-equipment power systems where robust 40 V-class input tolerance matters.
Design consideration: with 10 V gate drive the controller needs VCC at or above 13 V for full gate swing; at lower VCC consult the datasheet gate-drive curves before selecting MOSFETs.
This page adds distributor pricing context, same-family drop-in variants, and practical design notes not found in the manufacturer datasheet.
Alternativas directas para LT3782EFE — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con LT3782EFE (mismo factor de forma y huella) — difiere en RoHS Status, Topology, Gate Drive Voltage, Number of Outputs, Operating Temperature Range.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
LT3782IFE
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LT3782AIFE
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LT3782AFE
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
LT3783EFE
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
LT3782EFE Valores máximos y características eléctricas
| Función | Step-Up (Boost) DC/DC Controller |
| Topología | 2-Phase Interleaved Boost |
| Control Scheme | Current Mode PWM |
| Frecuencia de conmutación | Up to 500 kHz |
| Gate Drive Voltage | 10 V (VCC >= 13 V) |
| Peak Gate Drive Current | 4 A |
| Input Voltage, Max | 40 V |
| Tensión de salida | Adjustable |
| Output Current | 4 A (as listed by distributor data) |
| Error Amplifier | Transconductance (gm) amplifier |
| Encapsulado | 28-TSSOP with Exposed Pad (FE) |
| Tipo de montaje | Surface Mount |
| Number of Phases | 2 |
| Número de salidas | 2 (gate drive outputs) |
| Estado RoHS | PBF (lead-free) version available as LT3782EFE#PBF |
Guía de configuración de pines de LT3782EFE 28-tssop with exposed pad (fe)
Configuración de pines para LT3782EFE (encapsulado 28-tssop with exposed pad (fe)). Este dispositivo de potencia presenta terminales de puerta, drenador y fuente. Para encapsulados no polarizados, consulte la hoja de datos del fabricante para conocer la orientación exacta del pin 1 y los detalles del footprint. Las aplicaciones habituales incluyen el diseño de fuentes de alimentación, el accionamiento de motores y la conmutación de cargas.
No hay datos detallados de patillaje disponibles para LT3782EFE.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
LT3782EFE es adecuado para 6 aplicacións: Industrial 24V-to-48V Bus Step-Up, Telecom and Datacom Power, High-Power Battery Charging and Backup, Automotive and Heavy Equipment Power, Distributed Power and Point-of-Load Preregulation, Test and Measurement Instrument Supplies.
Industrial 24V-to-48V Bus Step-Up
The LT3782EFE is well suited to stepping industrial 24 V rails up to 48 V for drives, PLC backplanes, and factory automation power distribution. Its 40 V maximum input rating tolerates 24 V bus transients, while 10 V gate drive (VCC >= 13 V) fully enhances industrial-grade high-power MOSFETs, keeping conduction losses low at multi-hundred-watt levels. The 2-phase interleaved topology cancels ripple currents at the input, reducing input capacitor stress in high-current 24 V systems, and the up-to-500 kHz switching frequency allows compact inductors. Place the controller close to the power MOSFETs with short gate loops, and use the exposed-pad TSSOP for solid thermal connection to the PCB ground plane.
Recomendado
Telecom and Datacom Power
Telecom equipment running from -48 V or 24 V battery plants frequently needs localized step-up conversion for fans, RF PA modules, and auxiliary rails. The LT3782EFE's current mode control gives fast, stable loop response under the dynamic loads typical of PA bias supplies, and 4 A peak gate drive supports paralleled power MOSFETs for very high output power. Two-phase operation halves the effective ripple frequency content seen by output filters, easing EMI filter design for 500 kHz-class switching. Its adjustable output allows precise rail targeting, and the -40 C capable temperature rating suits outdoor cabinet installations with appropriate I-grade silicon selection.
Recomendado
High-Power Battery Charging and Backup
In battery-backup and fast-charging systems, a boost converter must push substantial power from a lower battery voltage to a higher DC bus. The LT3782EFE's 2-phase architecture spreads thermal load across two inductors and two MOSFET pairs, improving heat spreading on the PCB versus a single-phase boost controller at equal power. Current mode control naturally limits inductor current cycle by cycle, protecting the battery and power stage during faults. With 10 V gate drive at VCC >= 13 V, standard power MOSFETs run at low RDS(ON), maximizing charge efficiency, while the 500 kHz capability shrinks magnetics in portable or rack-mounted chargers.
Recomendado
Automotive and Heavy Equipment Power
Heavy vehicles and construction equipment use 12 V or 24 V electrical systems with wide transient envelopes, making a robust boost controller valuable for driving HID ballasts, audio amplifiers, and auxiliary 48 V loads. The LT3782EFE's 40 V input tolerance and industrial-grade gate drive handle load-dump-adjacent conditions when paired with proper front-end protection. Two-phase operation reduces input ripple current drawn from wiring harnesses, easing conducted emissions compliance, and cycle-by-cycle current limiting protects against shorted loads in harsh environments. For extreme automotive temperature requirements, the pin-compatible LT3782IFE and LT3782AIFE variants extend the qualified temperature envelope without PCB changes.
Recomendado
Distributed Power and Point-of-Load Preregulation
In distributed power architectures, a front-end boost stage often preregulates an unregulated bulk rail up to a fixed intermediate bus voltage feeding downstream point-of-load converters. The LT3782EFE fits this role because its adjustable output lets designers target a precise intermediate bus, its interleaved phases reduce bulk capacitance requirements at both ports, and its 500 kHz maximum frequency keeps the magnetics small enough for 1U rack depths. The transconductance error amplifier provides a well-behaved loop for compensation with standard type-II networks, and high gate-drive current supports synchronous rectification MOSFETs for efficiency above 95 percent in optimized designs.
Recomendado
Test and Measurement Instrument Supplies
Bench instruments, electronic loads, and OEM test systems need adjustable high-current boost rails for biasing devices under test. The LT3782EFE's adjustable output supports programmable supply designs where an MCU-driven DAC sets the feedback reference, and its current mode loop remains stable across wide output ranges - critical for instruments that sweep voltage continuously. The 2-phase topology minimizes output ripple at up to 500 kHz, preserving measurement integrity in noise-sensitive test setups. Peak current limit set via the current sense network provides deterministic short-circuit protection for the instrument's output stage and the device under test alike.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para LT3782EFE — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | LT3782IFE | LT3782AIFE | LT3782AFE |
|---|---|---|---|---|
| Package | 28-TSSOP-EP (FE) | 28-TSSOP-EP (FE) - same | 28-TSSOP-EP (FE) - same | 28-TSSOP-EP (FE) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Topology | 2-Phase Boost, Current Mode | 2-Phase Boost, Current Mode | 2-Phase Boost, Current Mode (A revision) | 2-Phase Boost, Current Mode (A revision) |
| Temperature Grade | E-grade | I-grade (wider) | I-grade (wider) | E-grade |
| Lead-Free / RoHS | #PBF version available | #PBF version available | #PBF version available | #PBF version available |
Diferenciadores clave
- Guaranteed wide industrial temperature range (frente a LT3782EFE (this part, E-grade))
- 4 A peak gate drive current (frente a Lower-drive single-phase boost controllers)
- 2-phase interleaving halves filter size (frente a Single-phase boost controllers at equal power)
- Enhanced A-revision silicon available pin-compatible (frente a LT3782AFE / LT3782AIFE)
Notas de diseño
The LT3782 datasheet specifies full 10 V gate drive only when VCC >= 13 V. If the controller is powered from a lower rail, size an auxiliary bootstrap supply (e.g., a small charge pump or secondary winding) to hold VCC at 13 V or above under all load conditions. At reduced gate drive, MOSFET RDS(ON) rises and switching losses increase, which can cascade into thermal failure at high output current. Also verify the current-sense resistor power rating: estimated dissipation equals I_rms squared times R_sense, so at tens of amps use a low-ohmic, high-power sense element with Kelvin connections.
Keep the two gate-drive loops (each driver to its MOSFET gate and source return) short and closely coupled to minimize parasitic inductance - long gate traces cause ringing, spurious turn-on, and EMI. Use the exposed pad of the 28-TSSOP-EP (FE) package soldered to a multipoint ground array of thermal vias. Place the current sense resistor and its differential sense traces as a Kelvin pair directly at the resistor pads. Mirror the two phase layouts symmetrically so both phases share identical parasitics; imbalance degrades ripple cancellation, which is the core benefit of 2-phase operation.
The LT3782EFE is a controller, so most heat is dissipated in the external MOSFETs, inductors, and sense resistor rather than the IC itself. Still, Estimated: gate-drive power dissipated in the IC approximately equals Q_g_total x f_sw x V_drive; with two 100 nC MOSFETs at 500 kHz and 10 V drive, that is roughly 2 x 100n x 500k x 10 = 1 W of driver dissipation - provide exposed-pad copper and thermal vias to keep the junction within rating. Verify MOSFET switching plus conduction loss budget separately against their SOA curves.
Do not exceed the 40 V maximum input rating - industrial 24 V and telecom buses routinely spike well above nominal, so add a surge stopper or TVS front end. Use the #PBF suffix when ordering if RoHS is required; the historical non-PBF ordering code can lead to non-compliant stock. When compensating the current mode loop, remember the gm error amplifier: choose the output divider and compensation network per the datasheet application section rather than copying single-voltage-mode designs, and re-check compensation whenever output capacitance changes between design revisions.
Información de cumplimiento
The #PBF suffix denotes lead-free/RoHS-compliant packaging per Analog Devices convention; distributor data notes RoHS status differing between ordering codes - order LT3782EFE#PBF or #TRPBF for compliant product.
