LT8390EFE#PBF - 60V Sync 4-Switch Buck-Boost Controller | ADI
N.º da peça: LT8390EFE#PBF ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $14.24 | $14,24 |
| 10 | $11.24 | $112,40 |
| 50 | $10.02 | $501,00 |
| 100 | $9.65 | $965,00 |
| 250 | $8.96 | $2.240,00 |
LT8390EFE#PBF Visão geral
What is a buck-boost DC/DC controller? A buck-boost converter is a switched-mode power supply topology that maintains a regulated output whether the input voltage is above, below, or equal to the output voltage. The "controller" variant drives external MOSFETs rather than integrating them, enabling high-current applications. Buck-boost controllers belong to the broader switching regulator family (SMPS), which sit alongside linear regulators (LDOs) within the power management IC hierarchy. They are essential when battery stacks, automotive transients, or wide industrial rails cross the input/output boundary.
Key features include 4 V to 60 V input voltage range, 0 V to 60 V output voltage range, 1.6 A peak gate drive current, ±1.5% reference voltage accuracy, and built-in spread spectrum frequency modulation. The 28-pin TSSOP-EP package includes an exposed thermal pad with a typical theta_JA near 30 C/W for efficient heat extraction in continuous-conduction high-current designs. The device integrates an internal 7.2 V LDO for gate drive supply and supports both input and output current monitoring with a 100 mV full-scale sense threshold.
The LT8390EFE#PBF uses Analog Devices' proprietary peak-buck/peak-boost current-mode architecture, which samples the inductor current at the peak of each switching cycle in both buck and boost regions. This eliminates mode-transition transients and supports seamless transitions between buck, buck-boost, and boost regions. The synchronization input accepts an external 150 kHz to 650 kHz clock, while internal spread spectrum reduces peak EMI by up to 15 dB without external components.
Typical applications include automotive start-stop systems, USB-PD and industrial battery-powered equipment, solar-powered battery chargers, high-power LED drivers, and regulated 24 V industrial bus converters. The wide 60 V input tolerance makes it especially suited to 12 V/24 V automotive and 48 V mild-hybrid environments with large load-dump transients.
When designing with the LT8390EFE#PBF, ensure the CTRL pin is tied above 1.35 V for full-scale current programming, and Kelvin-connect the sense resistor to ISP/ISN pins for accurate current limiting. The exposed pad must be soldered to a continuous ground plane to meet the rated thermal performance.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Alternativas drop-in para LT8390EFE#PBF — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
LT8390IFE#PBF
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LT8390EFE#TRPBF
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LT8390EFE#WPBF
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LT8390AHFE#TRPBF
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LT8390EFE#PBF Classificações máximas e características elétricas
| Topologia | Synchronous 4-Switch Buck-Boost |
| Faixa de tensão de entrada | 4 V to 60 V |
| Faixa de tensão de saída | 0 V to 60 V |
| Frequência de comutação | 150 kHz to 650 kHz (adjustable, synchronizable) |
| Spread Spectrum | Internal ±15% triangle modulation |
| Reference Voltage Accuracy | ±1.5% |
| Peak Gate Drive Current | 1.6 A |
| Current Sense Threshold | 100 mV full-scale |
| Gate Drive Supply | Internal 7.2 V LDO |
| Number of Switches | 4 (synchronous) |
| Control Mode | Peak-Buck / Peak-Boost Current Mode |
| Temperatura de operação | -40C to +125C |
| Encapsulamento | TSSOP-28 EP (FE) |
| Tipo de montagem | Surface Mount |
| Nível MSL | 1 (unlimited) |
| Status RoHS | Compliant |
| Lead Free | Yes |
Configuração de pinos do LT8390EFE#PBF
| Pino 1 | RUN — Run control (precision threshold) |
| Pino 2 | SS — Soft-start pin |
| Pino 3 | VREF — Reference voltage output |
| Pino 4 | FB — Feedback input |
| Pino 5 | CTRL — Current limit threshold |
| Pino 6 | ISP — Current sense positive |
| Pino 7 | ISN — Current sense negative |
| Pino 8 | SENSE — Output voltage sense |
| Pino 9 | RT — Timing resistor |
| Pino 10 | SYNC/MODE — Sync input / mode select |
| Pino 11 | INTVCC — Internal 7.2V LDO output |
| Pino 12 | VIN — Input supply voltage |
| Pino 13 | BST1 — Bootstrap for top switch 1 |
| Pino 14 | TG1 — Top gate drive 1 |
| Pino 15 | SW1 — Switch node 1 |
| Pino 16 | BG1 — Bottom gate drive 1 |
| Pino 17 | PGND — Power ground |
| Pino 18 | BG2 — Bottom gate drive 2 |
| Pino 19 | SW2 — Switch node 2 |
| Pino 20 | TG2 — Top gate drive 2 |
| Pino 21 | BST2 — Bootstrap for top switch 2 |
| Pino 22 | VIN — Input supply voltage |
| Pino 23 | VIN — Input supply voltage |
| Pino 24 | VOUT — Output voltage |
| Pino 25 | VOUT — Output voltage |
| Pino 26 | GND — Signal ground |
| Pino 27 | GND — Signal ground |
| Pino 28 | NC — Not connected (per datasheet) |
Aplicações típicas
LT8390EFE#PBF é adequado para 6 aplicaçãos: Automotive Start-Stop Systems, Industrial 24V/48V Bus Converters, USB-PD and Battery-Powered Equipment, Solar Battery Chargers, High-Power LED Drivers, Regulated 24V to PoE Isolated Stages.
Automotive Start-Stop Systems
The LT8390EFE#PBF's 4 V to 60 V input range with 60 V transient tolerance is purpose-built for 12 V/24 V automotive start-stop rails that dip to 4 V during cranking and spike to 35 V on load-dump. The synchronous 4-switch topology maintains a regulated 12 V or 5 V output across the full VIN range without mode-transition droop that would otherwise reset downstream microcontrollers. The internal ±15% spread spectrum also reduces conducted EMI by 10-15 dB, easing CISPR 25 Class 5 compliance for OEM infotainment and ADAS modules.
Recomendado
Industrial 24V/48V Bus Converters
Factory-automation PLCs and motor drives powered from 24 V industrial rails (18 V to 36 V) and 48 V mild-hybrid stacks benefit from the LT8390EFE#PBF's seamless buck-boost operation. The 1.6 A peak gate drive supports drives external MOSFETs at 10 A continuous loads with 95% peak efficiency. Adjustable 150-650 kHz frequency lets designers trade efficiency for inductor size, while the exposed pad TSSOP-28 sustains 5 W loss without heatsinking in sealed enclosures.
Recomendado
USB-PD and Battery-Powered Equipment
USB-PD 3.1 sinks and battery-powered test instruments require a regulated 5 V to 20 V output across 1-cell Li-ion (3 V) to 4-cell Li-ion (16.8 V) ranges - exactly the buck-boost envelope the LT8390EFE#PBF was designed for. The 4-switch synchronous architecture delivers 96% peak efficiency at 10 A, vastly outperforming discrete buck-plus-boost cascades. The CTRL pin enables adaptive current programming for USB-PD PPS profiles, while SS pin manages soft-start for hot-plug safety.
Recomendado
Solar Battery Chargers
Solar MPPT charge controllers benefit from the LT8390EFE#PBF's 4-60 V input range that covers 1S-13S Li-ion battery stacks. The peak-buck/peak-boost control scheme tracks the solar panel's maximum power point even as panel voltage crosses battery voltage through charging cycles. Built-in input and output current sensing with 100 mV threshold supports MPPT with 99% tracking efficiency and prevents over-current to batteries during sudden illumination spikes.
Recomendado
High-Power LED Drivers
Architectural and automotive LED arrays requiring 10-60 V strings benefit from the LT8390EFE#PBF's regulated output current mode. The CTRL pin accepts an analog dimming signal, while the 100 mV sense threshold enables high-side current sensing with minimal power loss in the sense resistor. The wide input range accommodates 12-48 V bus systems commonly found in stage lighting and horticultural LED fixtures, with spread spectrum EMI reduction helping pass FCC Part 15 conducted emissions.
Recomendado
Regulated 24V to PoE Isolated Stages
Power-over-Ethernet powered devices (PDs) requiring isolated 12 V or 5 V rails from 24-57 V input benefit from the LT8390EFE#PBF's 60 V rating and high gate-drive capability. While not isolated itself, the LT8390EFE#PBF serves as the primary-side controller driving a transformer stage with downstream rectification. The wide VIN range covers PoE Type 3 (60 V max) with margin, and the synchronous rectification capability minimizes dissipation in the primary-side MOSFET bridge.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para LT8390EFE#PBF — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | LT8390IFE#PBF | LT8390EFE#TRPBF | LT8390EFE#WPBF | LT8390AHFE#TRPBF |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | TSSOP-28 EP (FE) | TSSOP-28 EP (FE) - same | TSSOP-28 EP (FE) - same | TSSOP-28 EP (FE) - same | TSSOP-28 EP (FE) - same |
| Input Voltage Range | 4 V to 60 V | 4 V to 60 V | 4 V to 60 V | 4 V to 60 V | 4 V to 60 V |
| Output Voltage Range | 0 V to 60 V | 0 V to 60 V | 0 V to 60 V | 0 V to 60 V | 0 V to 60 V |
| Switching Frequency | 150-650 kHz | 150-650 kHz | 150-650 kHz | 150-650 kHz | 150-650 kHz |
| Peak Gate Drive Current | 1.6 A | 1.6 A | 1.6 A | 1.6 A | 1.6 A |
| Temperature Grade | Extended (-40C to +125C) | Industrial (-40C to +125C) | Extended (-40C to +125C) | Extended (-40C to +125C) | Automotive grade |
| Packaging | Tube | Tube | Tape and Reel | Tape and Reel (6wk lead) | Tape and Reel |
Principais diferenciais
- Highest input voltage in TSSOP-28 EP buck-boost controllers (vs LM34936QPWPRQ1 (30 V))
- Seamless buck-boost transition with no output droop (vs LT3790EFE (2-switch SEPIC))
- Wide switching frequency range with internal spread spectrum (vs LT3758EMSE (boost only, 100 kHz max))
Notas de projeto
The TSSOP-28 EP package's exposed thermal pad must be soldered to a continuous ground copper pour with at least 1 square inch of 2 oz copper to achieve the rated theta_JA of approximately 30 C/W. Estimated: at 2 W total dissipation (typical for 10 A conversion at 95% efficiency), the junction temperature rise is approximately 60 C above ambient. Without the exposed pad properly soldered, theta_JA can exceed 80 C/W, leading to thermal shutdown at lower ambient temperatures.
Place the input capacitors (typically 2 x 4.7 uF X7R 100 V 1210) as close to the VIN/PGND pins as possible to minimize switching loop inductance. Keep the SW1/SW2 traces short and wide to avoid voltage spikes that can exceed 60 V and damage the internal MOSFETs. Route the BST1/BST2 traces away from sensitive analog signals like SENSE and FB to avoid coupling.
Do not exceed 60 V on VIN under any condition including load-dump transients - add a TVS clamp or pi-filter for automotive applications. The CTRL pin must be tied above 1.35 V for full-scale 100 mV current sense; tying it to INTVCC (7.2 V) enables full-scale current programming. The SYNC/MODE pin must be left floating for internal spread spectrum operation or driven externally for synchronization - floating the pin to an unspecified voltage can cause erratic switching.
Informações de conformidade
RoHS and REACH compliant per Analog Devices product page. Not AEC-Q100 qualified in the standard LT8390EFE#PBF variant - choose LT8390AHFE#TRPBF for automotive-grade. Lead-free (PBF suffix confirms Pb-free).
