LM5148-Q1
Controlador CC/CC buck síncrono automotriz de 80 V con IQ ultrabaja
LM5148-Q1
- AEC-Q100 qualified for automotive applications:
- Device temperature grade 1: –40°C to +125°C ambient operating temperature
- Functional Safety-Capable
- Integrated EMI mitigation
- Selectable dual random spread spectrum (DRSS) feature for enhanced EMI performance across low and high-frequency bands
- Optimized for CISPR 25 Class 5 requirements
- Versatile synchronous buck DC/DC controller
- Wide input voltage range of 3.5V to 80V
- 1% accurate, fixed 3.3V, 5V, 12V, or adjustable output from 0.8V to 55 V
- 150°C maximum junction temperature
- Shutdown mode current of 2.3µA
- No-load sleep current of 9.5µA
- Internal soft-start ramp of 3ms
- Stackable up to two phases
- Internal bootstrap diode
- Switching frequency from 100kHz to 2.2MHz
- SYNC in and SYNC out capability
- Inherent protection features for robust design
- Internal hiccup mode overcurrent protection
- ENABLE and PGOOD functions
- VCC, VDDA, and gate-drive UVLO protection
- Internal or external loop compensation
- Thermal shutdown protection with hysteresis
- VQFN-24 package with wettable flanks
- VQFN-19 package for increased high voltage pin spacing (Figure 5-2)
- Create a custom design using the LM5148-Q1 with WEBENCH Power Designer
The LM5148-Q1 is a 80V, ultra-low IQ synchronous buck DC/DC controller for high-current, single-output applications. The controller uses a peak current-mode control architecture for easy loop compensation, fast transient response, and excellent load and line regulation. The LM5148-Q1 can be set up in dual-phase mode (paralleled output) with accurate current sharing for high-current applications. The device can operate at input voltages as low as 3.5V, at nearly 100% duty cycle if needed.
The LM5148-Q1 has a unique EMI reduction feature known as Dual Random Spread Spectrum (DRSS). Combining low-frequency triangular and high-frequency random modulations mitigates EMI disturbances across lower and higher frequency bands, respectively. This hybrid technique aligns with the multiple resolution bandwidth (RBW) settings specified in industry-standard EMC tests.
Additional features of the LM5148-Q1 include 150°C maximum junction temperature operation, user-selectable diode emulation for lower current consumption at light-load conditions, open-drain power-good flag for fault reporting and output monitoring, precision enable input, monotonic start-up into prebiased load, integrated VCC bias supply regulator, internal 3ms soft-start time, and thermal shutdown protection with automatic recovery.
The LM5148-Q1 controller comes in 3.5mm × 5.5mm, 24-pin VQFN and a 19-pin VQFN, 4.50mm × 3.5mm thermally enhanced packages with wettable flank pins to facilitate optical inspection during manufacturing. For high voltage applications that require additional pin spacing between low voltage pins and high voltage pins, the pin spacing was increased to 0.6mm by removing a pin. To increase the spacing from VIN to the exposed pad, the exposed pad was reduced to 1.7mm × 2.3mm.
Documentación técnica
Tipo | Título | Fecha | ||
---|---|---|---|---|
* | Data sheet | LM5148-Q1 80V, Automotive, Synchronous, Buck DC/DC Controller With Ultra-Low IQ and Dual Random Spread Spectrum datasheet (Rev. A) | PDF | HTML | 23 ene 2025 |
Application note | Controller to Converter – Design Considerations for 24V and 48V Systems | PDF | HTML | 02 oct 2024 | |
Application note | How to Implement a Simple Constant Current Regulation Scheme to a PCM Based Buck | PDF | HTML | 16 ago 2023 | |
Functional safety information | LM5148-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA | PDF | HTML | 15 feb 2023 | |
User guide | LM25149-Q1 EVM User's Guide (Rev. A) | PDF | HTML | 29 abr 2022 |
Diseño y desarrollo
Para conocer los términos adicionales o los recursos necesarios, haga clic en cualquier título de abajo para ver la página de detalles cuando esté disponible.
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Encapsulado | Pines | Símbolos CAD, huellas y modelos 3D |
---|---|---|
VQFN (RGY) | 19 | Ultra Librarian |
VQFN (RGY) | 24 | Ultra Librarian |
Pedidos y calidad
- RoHS
- REACH
- Marcado del dispositivo
- Acabado de plomo/material de la bola
- Clasificación de nivel de sensibilidad a la humedad (MSL) / reflujo máximo
- Estimaciones de tiempo medio entre fallas (MTBF)/fallas en el tiempo (FIT)
- Contenido del material
- Resumen de calificaciones
- Monitoreo continuo de confiabilidad
- Lugar de fabricación
- Lugar de ensamblaje
Soporte y capacitación
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