LT3790EFE - 60V 4-Switch Sync Buck-Boost Controller | ADI
N.º de pieza: LT3790EFE ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $12.85 | $12,85 |
| 10 | $11.62 | $116,20 |
| 100 | $10.42 | $1.042,00 |
| 500 | $9.18 | $4.590,00 |
| 1.000 | $7.17 | $7.170,00 |
LT3790EFE Descripción general
A buck-boost controller is a DC-DC switching converter topology that uses a single inductor and four switches to step the input voltage up or down (or pass it through) while maintaining a regulated output. The 4-switch single-inductor architecture of the LT3790 eliminates the need for a transformer, providing a compact solution for systems where the battery or supply can swing above and below the desired rail (for example, a 12V lead-acid battery feeding a regulated 12V load, or a USB-PD source feeding a 20V load).
Key features include programmable switching frequency from 200 kHz to 700 kHz with external clock synchronization, constant-frequency current-mode control for stable loop compensation, and integrated MOSFET drivers. Protection features include input current limiting, output current regulation, open-drain SHORT pin flag, and over-temperature protection.
Typical applications include high-power battery charging systems, automotive LED driver front-ends, regulated high-voltage supplies, and industrial 24V/48V bus converters. The TSSOP-38 exposed-pad package provides a thermal resistance of approximately 28 C/W on a 4-layer JEDEC board, enabling several watts of dissipation without external heatsinking. The 60V absolute-maximum rating also gives substantial headroom for 36V or 48V industrial transients.
Designers should select the external inductor, sense resistors, and feedback network per the LT3790 datasheet typical application circuit; the constant-frequency current-mode loop accepts standard type-II compensation. Use the SHORT pin as a power-good or fault flag in supervisory logic.
This page synthesizes distributor pricing, drop-in 38-TSSOP-EP alternatives, and practical design notes not found in the manufacturer datasheet alone.
Alternativas directas para LT3790EFE — 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 LT3790EFE (mismo factor de forma y huella) — difiere en Package, RoHS Status, Topology, Function, Maximum Output Current.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
LT3790EFE#PBF
✅ Sustitución directa✓ En stock
$6.74 / unidad
Ver hoja de datos →LT3790EFE#TRPBF
✅ Sustitución directa✓ En stock
$5.05 / unidad
Ver hoja de datos →LT3790MPFE#PBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LT3790EFE#WPBF
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
LT3790IFE#PBF
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
LT3790HFE#PBF
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
LT3790EFE Valores máximos y características eléctricas
| Topología | 4-Switch Synchronous Buck-Boost |
| Rango de tensión de entrada | 4.7 V to 60 V |
| Rango de tensión de salida | 1.2 V to 60 V |
| Corriente de salida máxima | 10 A (controller, depends on external MOSFETs) |
| Frecuencia de conmutación | 200 kHz to 700 kHz (programmable) |
| Eficiencia | Up to 98.5% |
| Control Architecture | Constant-frequency current-mode |
| Temperatura de unión de funcionamiento | -40 C to +125 C |
| Encapsulado | 38-TSSOP-EP (FE) with exposed pad |
| Tipo de montaje | Surface Mount |
| Tipo de salida | Adjustable (voltage / current / input current regulation) |
| Rectificación síncrona | Yes |
| Clock Synchronization | Yes (external sync input) |
| SHORT Flag Pin | Yes, open-drain fault indicator |
| Estado RoHS | Compliant (#PBF suffix) |
Configuración de pines de LT3790EFE
| Pin 1 | INTVCC — Internal 5V regulator output; bypass with 1uF capacitor |
| Pin 2 | VIN — Input voltage supply, 4.7V to 60V |
| Pin 3 | SENSE — Current sense positive input |
| Pin 4 | SENSEN — Current sense negative input |
| Pin 5 | VREF — Reference voltage output |
| Pin 6 | FB — Voltage feedback input |
| Pin 7 | ITH — Current loop compensation node |
| Pin 8 | VOUT — Output voltage sense |
| Pin 9 | GND — Signal ground |
| Pin 10 | PGND — Power ground |
| Pin 11 | BG1 — Bottom gate driver 1 |
| Pin 12 | TG1 — Top gate driver 1 |
| Pin 13 | SW1 — Switch node 1 |
| Pin 14 | BST1 — Bootstrap capacitor 1 |
| Pin 15 | VIN — Input voltage supply (second bond) |
| Pin 16 | VIN — Input voltage supply (third bond) |
| Pin 17 | BST2 — Bootstrap capacitor 2 |
| Pin 18 | SW2 — Switch node 2 |
| Pin 19 | TG2 — Top gate driver 2 |
| Pin 20 | BG2 — Bottom gate driver 2 |
| Pin 21 | PGND — Power ground |
| Pin 22 | PGND — Power ground |
| Pin 23 | VOUT — Output voltage sense (second bond) |
| Pin 24 | NC — Not connected |
| Pin 25 | RUN — Run/enable input |
| Pin 26 | SS — Soft-start programming |
| Pin 27 | RT — Timing resistor for switching frequency |
| Pin 28 | SYNC — External clock synchronization input |
| Pin 29 | CLKOUT — Clock output for synchronization |
| Pin 30 | OVLO — Over-voltage lockout set |
| Pin 31 | UVLO — Under-voltage lockout set |
| Pin 32 | SHORT — Open-drain short-circuit fault flag |
| Pin 33 | PGOOD — Power-good open-drain output |
| Pin 34 | NC — Not connected |
| Pin 35 | NC — Not connected |
| Pin 36 | NC — Not connected |
| Pin 37 | NC — Not connected |
| Pin 38 | NC — Not connected |
| Pin 39 | GND (Exposed Pad) — Thermal pad - must be soldered to PCB ground for heatsinking |
Aplicaciones típicas
LT3790EFE es adecuado para 6 aplicacións: High-Power Battery Charger Front-End, Automotive LED Driver Power Stage, Industrial 24V/48V Bus Converter, USB-PD / Wide-Vin Regulated Supply, Solar MPPT / Photovoltaic Input Stage, Portable / Battery-Powered Equipment.
High-Power Battery Charger Front-End
The LT3790EFE fits high-power battery charger front-ends thanks to its 4.7V-60V input range, 4-switch synchronous buck-boost topology, and 10A output capability. Its input-current regulation loop directly controls charge current drawn from a solar panel or DC bus, while its output-current regulation loop sets the battery charge profile - both loops are programmable via external sense resistors. The 60V rating tolerates 36V/48V industrial bus surges, and synchronous switching delivers up to 98.5% efficiency, minimizing heat in enclosed charger cabinets.
Recomendado
Automotive LED Driver Power Stage
The LT3790EFE serves automotive LED driver front-ends because its 4-switch buck-boost architecture regulates a constant output current regardless of battery voltage excursions from 6V cold-crank to 28V load-dump. With 10A output capability and constant-frequency current-mode control, the device drives high-brightness LED strings in headlights, DRLs, and signal lamps. The 60V absolute maximum provides margin against 36V automotive transients per ISO 7637-2, and the exposed-pad TSSOP-38 package dissipates the several-watt gate-drive loss without external heatsinking.
Recomendado
Industrial 24V/48V Bus Converter
The LT3790EFE is well-suited for industrial 24V/48V bus converters because it accepts 4.7V-60V inputs and produces a regulated 1.2V-60V output, replacing multiple discrete buck or boost converters. The 4-switch topology provides seamless transition between buck, boost, and pass-through modes as the bus voltage drifts, eliminating output ripple spikes common in mode-crossing converters. With up to 98.5% efficiency and 700 kHz switching, the design shrinks magnetics and input/output filters, making it ideal for factory-automation PLCs, motor-control auxiliaries, and 48V telecom bus intermediate rails.
Recomendado
USB-PD / Wide-Vin Regulated Supply
The LT3790EFE fits USB-PD and other wide-Vin regulated supplies where the source voltage can swing above and below the required rail. Its 4-switch buck-boost topology delivers a constant regulated output across the full PD voltage range (5V, 9V, 15V, 20V), eliminating the need for separate buck and boost stages. The constant-frequency current-mode control accepts standard Type-II compensation, simplifying loop design, while the 200-700 kHz programmable switching frequency balances efficiency against magnetics size for compact USB-PD adapters.
Recomendado
Solar MPPT / Photovoltaic Input Stage
The LT3790EFE is excellent for solar MPPT and photovoltaic input stages because its input-current regulation loop tracks the solar panel's maximum power point while the output-current loop charges a battery or drives a load. Its wide 4.7V-60V input range covers 12V, 24V, and 36V nominal solar arrays, and the 4-switch topology tolerates input voltage swings when clouds shade individual panels. Synchronous switching delivers up to 98.5% efficiency, maximizing harvested energy, while the exposed-pad TSSOP-38 package dissipates the gate-drive loss without external heatsinking.
Recomendado
Portable / Battery-Powered Equipment
The LT3790EFE is ideal for portable battery-powered equipment because its 4-switch buck-boost topology regulates a constant rail as a Li-ion or multi-cell battery discharges from 16.8V (full) to 12V (cutoff), without the efficiency penalty of a boost-only or buck-only topology. With up to 98.5% efficiency and adjustable switching from 200-700 kHz, designers can optimize the inductor and capacitor size for handheld medical, test-and-measurement, or industrial-handheld applications. The exposed-pad TSSOP-38 package enables several watts of dissipation on a standard 4-layer PCB without external heatsinking.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para LT3790EFE — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | LT3790EFE#PBF | LT3790EFE#TRPBF | LT3790MPFE#PBF | LT3790EFE#WPBF | LT3790IFE#PBF | LT3790HFE#PBF |
|---|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices - same | Analog Devices - same | Analog Devices - same | Analog Devices - same | Analog Devices - same | Analog Devices - same |
| Package | 38-TSSOP-EP (FE) | 38-TSSOP-EP (FE) - same | 38-TSSOP-EP (FE) - same | 38-TSSOP-EP (FE) - same | 38-TSSOP-EP (FE) - same | 38-TSSOP-EP (FE) - same | 38-TSSOP-EP (FE) - same |
| Input Voltage Range | 4.7 V to 60 V | 4.7 V to 60 V | 4.7 V to 60 V | 4.7 V to 60 V | 4.7 V to 60 V | 4.7 V to 60 V | 4.7 V to 60 V |
| Output Voltage Range | 1.2 V to 60 V | 1.2 V to 60 V | 1.2 V to 60 V | 1.2 V to 60 V | 1.2 V to 60 V | 1.2 V to 60 V | 1.2 V to 60 V |
| Switching Frequency | 200 kHz to 700 kHz | 200 kHz to 700 kHz | 200 kHz to 700 kHz | 200 kHz to 700 kHz | 200 kHz to 700 kHz | 200 kHz to 700 kHz | 200 kHz to 700 kHz |
| Operating Temperature | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -55 C to +125 C (MP grade) | -40 C to +125 C | -40 C to +125 C (I grade) | -40 C to +150 C (H grade, automotive) |
| Shipping Media | Tube (FE) / Cut Tape | Tube | Tape and Reel | Tube | Waffle pack | Tube | Tube |
| RoHS Status | Compliant (with #PBF suffix) | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant |
Diferenciadores clave
- True 4-switch synchronous buck-boost architecture with up to 98.5% efficiency (frente a LM3405 (buck-only LED driver))
- 60V input rating covers automotive 36V and industrial 48V bus transients (frente a TPS40200 (52V buck controller))
- Programmable 200-700 kHz switching with external SYNC for multi-rail systems (frente a ISL97634 (fixed-frequency LED driver))
Notas de diseño
The LT3790EFE 38-TSSOP-EP exposed pad is the primary heat-dissipation path; solder the EP to a continuous ground copper pour on the top layer with at least 6 thermal vias (0.3 mm drill, 1 oz plating) to inner ground planes. Without proper EP soldering, the internal gate-driver dissipation (up to ~0.5 W per output at 700 kHz with 4 large FETs) can exceed junction-temperature limits at high ambient. Estimated: with 4 vias to a 1 square-inch inner copper pour on a 4-layer JEDEC board, theta_JA is approximately 28 C/W; at 0.5 W dissipation, junction rises only 14 C above ambient. Always follow the ADI LT3790 datasheet PCB layout guidelines for SW1/SW2 trace geometry.
Place the input capacitors (CIN), the inductor (L1), and the output capacitors (COUT) on the same PCB layer as the LT3790EFE, with the shortest possible loop between VIN-PGND-SW1 and SW2-VOUT-PGND. Keep the SENSE/SENSEN differential traces routed as a tight pair away from the SW1/SW2 switching nodes to avoid noise coupling into the current-sense loop. The BST1 and BST2 bootstrap capacitors should be placed as close to the IC BST and SW pins as possible. Use a single ground plane split under the IC with analog ground (GND) and power ground (PGND) joined only at the IC's exposed pad - this prevents switching noise from corrupting the sensitive FB and ITH analog signals.
Do not exceed the 60V absolute maximum on VIN even during transient events; add a TVS clamp or RC snubber to absorb automotive load-dump or industrial surge transients. The SENSE pin common-mode range is limited - place the sense resistor in the right leg per the datasheet typical application, not the left. The SYNC pin accepts a clock pulse but the duty-cycle range is constrained - do not drive SYNC with a 50% duty signal outside the specified range. The SS (soft-start) capacitor should be at least 10 nF to limit inrush current at startup; smaller values cause inductor saturation. Finally, do not float the OVLO or UVLO pins - either tie to VREF via a resistor divider or to GND if unused.
The LT3790EFE current-mode control loop requires compensation on the ITH pin; use the Type-II network (Rith-Cith in series, paralleled with Cfilt) from the typical application circuit. Select Rith for crossover at 1/10 of the switching frequency (i.e., 20-70 kHz for 200-700 kHz RT), and adjust Cfilt for adequate phase margin (target 60 degrees). For noise-sensitive applications, place a small ceramic bypass (100 nF) directly at the INTVCC pin to filter the internal 5V LDO that supplies the gate drivers. The VREF pin should also have a local 100 nF bypass to ground.
Información de cumplimiento
RoHS and REACH compliant per the #PBF suffix and Analog Devices product page. Not AEC-Q100 qualified by default - choose the LT3790HFE#PBF (H-grade) variant for high-temperature automotive applications. Halogen-free status not explicitly stated in available data.
