LM62435BPPQRJRRQ1 - 3.5A, 36V Automotive Sync Step-Down | TI
N.º de pieza: LM62435BPPQRJRRQ1 ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $5.0875 | $5,09 |
| 10 | $4.85 | $48,50 |
| 100 | $4.32 | $432,00 |
| 500 | $3.88 | $1.940,00 |
| 1.000 | $3.45 | $3.450,00 |
LM62435BPPQRJRRQ1 Descripción general
A buck converter (also called a step-down switching regulator) is a switched-mode power supply topology that efficiently converts a higher DC input voltage to a lower DC output voltage by rapidly switching an inductor between charge and discharge cycles. The LM62435BPPQRJRRQ1 belongs to the synchronous buck family, meaning the freewheeling diode is replaced by a low-side FET for higher efficiency and smaller solution size. Within the broader system hierarchy, it sits as a DC-DC converter -> switching regulator -> power management IC -> semiconductor. This category dominates automotive 12 V/24 V POL rails where step-down conversion at high current and high efficiency is mandatory.
Key features include up to 3.5 A continuous load, 3.0 V to 36 V operating input (42 V load-dump tolerant), integrated 65 mΩ/35 mΩ HS/LS MOSFETs, and a fixed 3.3 V output variant with adjustable cousins in the family. The device offers low-EMI operation with spread-spectrum frequency modulation, programmable switching frequency, internal compensation, and a 7 µA Iq in PFM at light load. The 14-pin PowerVQFN (RJY) package provides a low-thermal-resistance path for sustained high-current automotive operation.
The architecture uses peak-current mode control with an internal compensation network, achieving fast transient response and cycle-by-cycle current limiting. The AEC-Q100 Grade 1 qualification confirms operation across -40 °C to +125 °C ambient, and the wide VIN range absorbs cold-crank and load-dump disturbances. Internal MOSFETs eliminate the need for external switches, shrinking the BOM.
Typical applications include automotive infotainment systems, ADAS sensor power, body electronics and lighting, USB-PD vehicle charging ports, and industrial 24 V distributed-bus POL converters. The wide VIN also suits eMobility and battery-powered industrial equipment.
Design consideration: prioritize input capacitance placement to handle load-dump transients up to 42 V, and verify the inductor saturation current exceeds the peak inductor current by at least 30% to avoid saturation during transients. A 2.2 µH to 10 µH inductor is typical; choose a lower value for smaller ripple at the cost of higher inductor peak current.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet. Source: Texas Instruments LM62435-Q1 datasheet.
Alternativas directas para LM62435BPPQRJRRQ1 — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
LM62435APPQRJRRQ1
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LM62435CFPQRJRRQ1
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
LM62435BPPQRJRRQ1 Valores máximos y características eléctricas
| Topología | Synchronous Buck (Step-Down) |
| Input Voltage Range (Operating) | 3.0 V to 36 V |
| Input Voltage Range (Transient, 400 ms) | Up to 42 V (load-dump tolerant) |
| Output Current (Continuous) | 3.5 A |
| Output Voltage (Fixed Variant) | 3.3 V |
| High-Side MOSFET RDS(on) | 65 mΩ |
| Low-Side MOSFET RDS(on) | 35 mΩ |
| Quiescent Current (PFM, light load) | 7 µA |
| Control Mode | Peak Current Mode |
| Arranque suave | Internal, soft-recovery from dropout |
| EMI Features | Spread-spectrum frequency modulation |
| Rango de temperatura de funcionamiento | -40 °C to +125 °C |
| Encapsulado | 14-pin PowerVQFN (RJY) |
| AEC-Q100 Qualification | Grade 1, automotive qualified |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant |
Configuración de pines de LM62435BPPQRJRRQ1
| Pin 1 | VIN — Input supply voltage (3.0 V to 36 V) |
| Pin 2 | VIN — Input supply voltage |
| Pin 3 | EN — Enable input (active high) |
| Pin 4 | BST — Bootstrap capacitor for high-side gate drive |
| Pin 5 | SW — Switch node (connect to inductor) |
| Pin 6 | SW — Switch node |
| Pin 7 | GND — Ground return |
| Pin 8 | FB — Feedback (fixed 3.3 V variant tied internally) |
| Pin 9 | RT — Frequency-setting resistor |
| Pin 10 | COMP — Compensation network (internal compensation used) |
| Pin 11 | PGOOD — Power-good indicator (open-drain) |
| Pin 12 | SS/TR — Soft-start and tracking input |
| Pin 13 | PGND — Power ground (return for low-side FET) |
| Pin 14 | PGND — Power ground / thermal pad |
Aplicaciones típicas
LM62435BPPQRJRRQ1 es adecuado para 6 aplicacións: Automotive Infotainment System Power, ADAS Sensor Power Supply, Automotive Body Electronics & Lighting, Industrial 24 V Distributed-Bus POL Converter, USB-PD Vehicle Charging Port Front-End, Battery-Powered Industrial / eMobility Auxiliary.
Automotive Infotainment System Power
The LM62435BPPQRJRRQ1's 3.0 V to 36 V input range and 3.5 A output current make it a strong fit for powering the SoC, memory, and display rails in automotive infotainment head units. The 42 V transient tolerance survives 12 V battery load-dump, while the integrated 65 mΩ/35 mΩ HS/LS FETs minimize the PCB footprint needed for an AEC-Q100 Grade 1 design. Spread-spectrum frequency modulation reduces conducted and radiated EMI to meet CISPR 25 Class 5 without complex filtering. The 7 µA PFM Iq helps meet dark-current budgets when the infotainment system is in standby.
Recomendado
ADAS Sensor Power Supply
Advanced driver-assistance systems (ADAS) such as front cameras, radar, and lidar modules demand low-noise, high-reliability POL rails. The LM62435BPPQRJRRQ1 delivers up to 3.5 A at fixed 3.3 V with 7 µA PFM Iq, supporting camera SoC, memory, and serializer rails. Its peak-current-mode control provides fast transient response to sudden processor load steps, and AEC-Q100 Grade 1 qualification is mandatory for safety-critical ASIL systems. The 14-pin PowerVQFN (RJY) package keeps the solution compact for space-constrained sensor modules mounted behind the windshield or in bumpers.
Recomendado
Automotive Body Electronics & Lighting
Body control modules, LED headlight drivers, and ambient lighting rails are well-served by the LM62435BPPQRJRRQ1's wide VIN and 3.5 A output. The 42 V transient tolerance eliminates the need for additional TVS clamps on 12 V body wiring, and AEC-Q100 Grade 1 ensures reliable operation across -40 °C to +125 °C under-hood or cabin environments. Spread-spectrum EMI reduction is especially valuable in lighting modules where switching noise could couple into LED current sense paths and cause flicker.
Recomendado
Industrial 24 V Distributed-Bus POL Converter
The LM62435BPPQRJRRQ1's 36 V continuous input range is well-suited for 24 V industrial distributed-bus systems that need a clean, efficient 3.3 V or 5 V POL rail. With 3.5 A output and integrated FETs, it can directly power microcontrollers, sensors, and isolated transceiver supplies. The wide VIN tolerance also handles 24 V surge events common in motor-drive cabinets, and the AEC-Q100 Grade 1 qualification, while automotive, exceeds typical industrial reliability requirements for factory-floor equipment.
Recomendado
USB-PD Vehicle Charging Port Front-End
USB-PD vehicle charging ports require a wide-VIN front-end converter to provide a stable intermediate rail for the downstream USB-PD controller. The LM62435BPPQRJRRQ1's 3.0 V to 36 V input, 3.5 A output, and 7 µA PFM Iq are ideal for a 5 V/3 A Type-C front end, and the AEC-Q100 Grade 1 qualification meets the strict automotive reliability requirements. The 14-pin PowerVQFN (RJY) package keeps the BOM compact, leaving room for the USB-PD controller and Type-C port on the same PCB.
Recomendado
Battery-Powered Industrial / eMobility Auxiliary
Battery-powered industrial tools, e-bikes, and small eMobility platforms run on multi-cell battery packs with voltages from 12 V to 36 V that step down to 3.3 V or 5 V rails for MCUs, sensors, and BLE modules. The LM62435BPPQRJRRQ1's 3.0 V to 36 V input covers this range natively, and its 7 µA PFM Iq extends battery life in standby. The 14-pin PowerVQFN (RJY) package is small enough for handheld enclosures, and AEC-Q100 Grade 1 gives a wide safety margin against the high-vibration, high-temperature conditions of eMobility platforms.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para LM62435BPPQRJRRQ1 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | LM62435APPQRJRRQ1 | LM62435CFPQRJRRQ1 |
|---|---|---|---|
| Package | 14-pin PowerVQFN (RJY) | 14-pin PowerVQFN (RJY) - same | 14-pin PowerVQFN (RJY) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Input Voltage Range | 3.0 V to 36 V (42 V transient) | 3.0 V to 36 V (42 V transient) | 3.0 V to 36 V (42 V transient) |
| Maximum Output Current | 3.5 A | 3.5 A | 3.5 A |
| Output Voltage Option | Fixed 3.3 V (B-suffix) | Fixed (A-suffix variant) | Fixed (C-suffix variant) |
| Integrated HS/LS MOSFETs | 65 mΩ / 35 mΩ | 65 mΩ / 35 mΩ | 65 mΩ / 35 mΩ |
| Quiescent Current (PFM) | 7 µA | 7 µA | 7 µA |
| AEC-Q100 Grade | Grade 1 (-40 °C to +125 °C) | Grade 1 | Grade 1 |
| Approx. Unit Price (qty 1) | ~$5.09 | ~$5.09 (similar tier) | ~$5.09 (similar tier) |
Diferenciadores clave
- Wide VIN with 42 V load-dump tolerance in a small 14-pin PowerVQFN (frente a LM62435APPQRJRRQ1)
- AEC-Q100 Grade 1 with 7 µA PFM Iq for lowest automotive dark current (frente a LM62435CFPQRJRRQ1)
- Integrated 65 mΩ/35 mΩ HS/LS FETs shrink BOM and PCB area (frente a Non-integrated controllers requiring external FETs)
Notas de diseño
Input capacitor sizing is critical for load-dump handling on 12 V automotive rails. Per the LM62435-Q1 datasheet, place at least one 4.7 µF X7R 50 V ceramic capacitor as close as possible to the VIN pins, with a 0.1 µF X7R 50 V bypass in parallel for high-frequency decoupling. The bulk input capacitor should be rated to withstand the 42 V load-dump pulse. This ensures the converter stays in regulation during cold-crank (down to 3.0 V) and load-dump (up to 42 V) events without triggering input UVLO or output overshoot.
At 3.5 A continuous load and 24 V VIN to 3.3 V VOUT, the converter dissipates roughly 0.6 W from the integrated FETs, well within the 14-pin PowerVQFN (RJY) thermal limits with proper PCB layout. However, at VIN = 24 V and full 3.5 A output the conduction losses rise. Use a 4-layer PCB with at least 1 oz copper on the top layer and thermal via array under the exposed pad to the inner ground plane to keep junction temperature below 125 °C. Estimated: theta_JA around 30-40 °C/W on a 4-layer 1 oz PCB, no heatsink required for typical automotive POL applications.
Do not omit the bootstrap capacitor on BST to SW - without it, the high-side FET will not turn on and the converter will not start. Use a 100 nF X7R 25 V ceramic rated for the SW node voltage swings. Also, route the FB net (or fixed-output pin) away from the SW node to avoid switching noise coupling that can cause output ripple or instability. For fixed 3.3 V output variants, the FB pin is internally tied - confirm with the datasheet pinout before connecting external components.
Keep the input capacitor return, power ground (PGND), and signal ground (GND) connected at a single point - typically the exposed thermal pad of the PowerVQFN (RJY) package. Minimize the SW node copper area to reduce EMI, but provide enough copper for thermal dissipation. Place the output capacitor as close as possible to the inductor and load, with a wide ground return path. Spread-spectrum frequency modulation helps reduce EMI peaks but does not eliminate layout discipline - good layout is still required to pass CISPR 25 Class 5.
Información de cumplimiento
AEC-Q100 Grade 1 qualified per TI datasheet. RoHS compliant per TI product page. The -Q1 suffix in the part number confirms automotive qualification.
