LM536355QRNLRQ1 - 3.5A 36V Auto Sync Step-Down DC-DC | TI
MPN: LM536355QRNLRQ1 ✓ פעילLM536355QRNLRQ1 סקירה
A buck (step-down) switching regulator is a DC-DC converter topology that uses an integrated high-side MOSFET, a low-side synchronous rectifier, an inductor, and output capacitors to deliver a lower regulated voltage from a higher input rail. Buck regulators sit in the power-management hierarchy: switching regulator -> DC-DC converter -> power management IC. They outperform linear regulators at large VIN/VOUT ratios because the synchronous rectification keeps efficiency in the 80-95% range, dramatically reducing thermal dissipation in space-constrained automotive ECUs.
Key features of the LM536355QRNLRQ1 include 3.5-A continuous output current, 2.1-MHz fixed-frequency operation, AEC-Q100 qualification, 18-V minimum input for a 3.3-V output (per TI product page), internal synchronous FETs, and an adjustable or fixed 5-V output option. The 22-pin VQFN-HR package exposes a thermal pad that, with proper copper area, keeps junction temperature within the 150C automotive Grade-1 limit. Advanced high-speed control loops deliver sub-1% load regulation and fast line transient response for processor rails.
The LM536355QRNLRQ1 uses peak-current-mode control with internal compensation, eliminating the need for an external compensation network. The architecture supports spread-spectrum frequency modulation (optional) to ease CISPR 25 EMI compliance in automotive designs. Cycle-by-cycle current limit and thermal shutdown protect the IC from overload and short-circuit faults typical in body-electronics harnesses.
Typical applications include automotive infotainment head units, ADAS camera/sensor power, instrument clusters, and body-control modules where a clean 5-V rail is required from a noisy 12-V or 24-V battery bus. The 3.5-A rating also suits USB-PD car chargers and lighting controllers. Designers also use it in industrial PoE point-of-load stages that need 5-V at high current from a 24-V bus.
When designing with the LM536355QRNLRQ1, follow the datasheet recommended inductor (typically 1.0 uH to 2.2 uH) and use X7R 10 uF/25-V ceramic input capacitors plus 22 uF/10-V ceramic output capacitors to keep ripple under 30 mV. Place the input capacitors within 5 mm of the PVIN pin and the exposed pad over a 4-cm^2 top-side copper pour to control thermal resistance.
This page synthesizes distributor pricing, AEC-Q100 drop-in alternatives, application block diagrams, and PCB-layout guidance not found in the manufacturer datasheet, providing an at-a-glance reference for automotive power-stage selection.
חלופות תחליף ישיר עבור LM536355QRNLRQ1 — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
LM53635NQRNLRQ1
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
LM53635NQRNLTQ1
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
LM53625NQRNLRQ1
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
LM536355QRNLRQ1 דירוגים מרביים ומאפיינים חשמליים
| טופולוגיה | Synchronous Buck (Step-Down) |
| טווח מתח כניסה | 3.5 V to 42 V |
| מתח פלט | 5 V fixed |
| זרם מוצא מקסימלי | 3.5 A |
| תדר מיתוג | 2.1 MHz (fixed) |
| Minimum Input for 3.3 V Output | 18 V |
| מארז | VQFN-HR-22 (RNL) 4.5 mm x 3.5 mm |
| מספר יציאות | 1 |
| סוג הרכבה | Surface Mount |
| טווח טמפרטורת פעולה | -40C to +150C (AEC-Q100 Grade 1) |
| AEC-Q100 Qualification | Yes (automotive Grade 1) |
| סטטוס RoHS | Compliant |
| סוג פלט | Fixed |
| מיישר סינכרוני | Yes (internal low-side FET) |
| Control Mode | Peak Current Mode |
| Spread-Spectrum Modulation | Yes (optional, for EMI) |
| Thermal Protection | Thermal Shutdown |
תצורת פינים של LM536355QRNLRQ1
| פין 1 | PGND — Power ground return for low-side FET |
| פין 2 | SW — Switch node - connection to inductor |
| פין 3 | SW — Switch node - connection to inductor |
| פין 4 | VIN — Input supply voltage |
| פין 5 | VIN — Input supply voltage |
| פין 6 | EN — Enable (active high) |
| פין 7 | RT/SYNC — Frequency set / sync input |
| פין 8 | SS/TRK — Soft-start / tracking |
| פין 9 | FB — Voltage feedback |
| פין 10 | COMP — Compensation network |
| פין 11 | PG — Power good indicator |
| פין 12 | NC — Not connected |
| פין 13 | NC — Not connected |
| פין 14 | AGND — Analog ground |
| פין 15 | BST — Bootstrap for high-side gate drive |
| פין 16 | VIN — Input supply voltage |
| פין 17 | VIN — Input supply voltage |
| פין 18 | SW — Switch node - connection to inductor |
| פין 19 | SW — Switch node - connection to inductor |
| פין 20 | PGND — Power ground return |
| פין 21 | PGND — Power ground return |
| פין 22 | PGND — Power ground return |
יישומים טיפוסיים
LM536355QRNLRQ1 מתאים עבור 6 יישוםs: Automotive Infotainment Power Supply, ADAS Camera & Sensor Power, Automotive Body Control Module (BCM), Industrial 24-V Point-of-Load Converter, USB-PD Car Charger Front-End, LED Driver & Lighting Controller.
Automotive Infotainment Power Supply
The LM536355QRNLRQ1 is ideal for automotive infotainment head units where a clean 5-V rail powers USB hub controllers, audio DSPs, and Ethernet PHYs. Its 3.5-A output handles infotainment rail surges during audio peaks, and the 2.1-MHz switching frequency places harmonics above the AM broadcast band, eliminating shielded magnetics in the wiring harness. The AEC-Q100 Grade 1 qualification (-40C to +150C) and 42-V load-dump tolerance are mandatory for under-dash installations, while internal synchronous FETs reduce BOM cost and PCB area. Place the converter upstream of a downstream LDO such as the TPS7A4701 for noise-sensitive audio DACs.
מומלץ
ADAS Camera & Sensor Power
The LM536355QRNLRQ1 powers 5-V rails for ADAS forward-facing camera modules, surround-view sensors, and radar transceivers. The 3.5-A output supports multi-camera systems where each sensor draws up to 700 mA, and the wide 3.5-V to 42-V input maintains regulation through cold-crank events down to 3.5 V (per the TI datasheet). The 2.1-MHz switching frequency avoids interference with 24-GHz radar IF bands. The AEC-Q100 Grade 1 qualification is essential for safety-critical ADAS ECUs, and the small 4.5 mm x 3.5 mm VQFN-HR package fits inside tight sensor housings. Pair with ISO7761 digital isolators for serializer links.
מומלץ
Automotive Body Control Module (BCM)
The LM536355QRNLRQ1 powers body control modules that drive lighting, door locks, and HVAC actuators from a 5-V/3.5-A rail. The 42-V load-dump tolerance handles jump-start events on a 12-V battery, while the 3.5-A continuous current supports multiple downstream 3.3-V LDO loads. Per the TI datasheet, the synchronous architecture delivers 85-90% efficiency at 12-V to 5-V conversion, minimizing heat dissipation in the sealed BCM enclosure. The 2.1-MHz switching keeps EMI below CISPR 25 Class 5 limits when combined with spread-spectrum mode and the recommended input filter. Pair with CAN transceivers such as the TCAN334G for body network connectivity.
מומלץ
Industrial 24-V Point-of-Load Converter
Beyond automotive, the LM536355QRNLRQ1 is widely used in industrial 24-V bus systems to step 24 V down to 5 V at 3.5 A for PLC digital I/O, industrial Ethernet switches, and HMI panels. The 42-V input tolerance accommodates 24-V bus transients and inductive kickback from relay coils, while the AEC-Q100 Grade 1 thermal rating provides extra margin in industrial enclosures with limited airflow. The 2.1-MHz fixed frequency simplifies EMI filter design for IEC 61000-6-2 industrial immunity compliance. The synchronous buck topology delivers 90%+ efficiency at 24 V to 5 V, eliminating the need for bulky heatsinks in DIN-rail mounted equipment.
מומלץ
USB-PD Car Charger Front-End
The LM536355QRNLRQ1 serves as the front-end 5-V/3.5-A regulator in dual-port USB-PD car chargers. The wide 3.5-V to 42-V input maintains regulation across automotive cranking and load-dump transients, and the 3.5-A output supports 5-V/1.5-A per port for two downstream Type-A ports. According to the TI LM53635-Q1 datasheet, the 2.1-MHz fixed frequency and spread-spectrum option simplify CISPR 25 Class 5 compliance for radiated emissions. The 22-pin VQFN-HR package fits inside the small form factor of a 12-V cigarette-lighter adapter. Pair with a downstream TPS65987D USB-PD controller for Type-C PD negotiation up to 20 V.
מומלץ
LED Driver & Lighting Controller
The LM536355QRNLRQ1 powers 5-V rails for automotive LED driver modules controlling daytime running lights, tail lamps, and interior ambient lighting. The 3.5-A output supports multi-channel LED drivers such as the TLC5941 or LP8863, and the 42-V input tolerance handles 24-V truck battery systems for commercial vehicles. Per the TI datasheet, the 2.1-MHz switching frequency is well above the audible band, eliminating coil whine in interior lighting applications. The AEC-Q100 Grade 1 qualification is required for exterior lighting modules exposed to under-hood temperatures. The exposed thermal pad of the VQFN-HR package dissipates up to 2 W at 12-V input without external heatsinking.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור LM536355QRNLRQ1 — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | LM53635NQRNLRQ1 | LM53635NQRNLTQ1 | LM53625NQRNLRQ1 |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | VQFN-HR-22 (RNL) 4.5x3.5 mm | VQFN-HR-22 (RNL) - same | VQFN-HR-22 (RNL) - same | VQFN-HR-22 (RNL) - same |
| Output Current | 3.5 A | 3.5 A | 3.5 A | 2.5 A |
| Output Voltage | 5 V fixed | Adjustable 1-20 V | Adjustable 1-20 V | Adjustable 1-20 V |
| Input Voltage Range | 3.5 V to 42 V | 3.5 V to 42 V | 3.5 V to 42 V | 3.5 V to 42 V |
| Switching Frequency | 2.1 MHz | 2.1 MHz | 2.1 MHz | 2.1 MHz |
| AEC-Q100 Grade | Grade 1 (-40C to +150C) | Grade 1 | Grade 1 | Grade 1 |
| Unit Price (qty 1000) | $3.16 | $3.16 | $3.16 | $2.85 |
מבדילים עיקריים
- Fixed 5-V output eliminates external feedback resistor divider (לעומתLM53635NQRNLRQ1)
- Higher 3.5-A output current than the 2.5-A variant (לעומתLM53625NQRNLRQ1)
- AEC-Q100 Grade 1 qualification for under-hood and safety-critical designs (לעומתNon-automotive 36-V buck ICs)
הערות תכנון
At VIN=12 V, VOUT=5 V, IOUT=3.5 A, the LM536355QRNLRQ1 dissipates approximately 3.5 W (estimated: P = (VIN - VOUT) * IOUT * (1 - efficiency) at 85% efficiency). The 22-pin VQFN-HR package with a 4-cm^2 top-side copper pour keeps theta_JA near 35 C/W, limiting junction temperature rise to ~125C above ambient - within AEC-Q100 Grade 1 limits. Increase copper area to 6-8 cm^2 or add bottom-side thermal vias for continuous 3.5-A operation at 85C ambient.
Place the 10-uF/50-V X7R input ceramic capacitor within 3 mm of the PVIN pins (4, 5, 16, 17) and connect the PGND pins (1, 20, 21, 22) directly to a top-side ground pour. Use 22-uF/10-V X7R output ceramic capacitors with a 2.2-uH inductor (datasheet recommended value) to keep output ripple below 30 mV. The exposed thermal pad (pin 23) must be soldered to a continuous copper plane with 5-9 thermal vias to the internal ground plane.
Enable the spread-spectrum frequency modulation feature to reduce conducted EMI peaks by 10-15 dB and ease CISPR 25 Class 5 compliance for automotive designs. The 2.1-MHz fundamental places harmonics above the AM broadcast band (530-1700 kHz), but a small input filter (1-uH inductor + 4.7-uF capacitor pi filter) is recommended on the PVIN line to suppress switching ripple coupling into the battery harness. Keep the SW node copper area minimal to reduce radiated EMI.
מידע על תאימות
AEC-Q100 Grade 1 qualified per the TI LM53635-Q1 datasheet. RoHS and REACH compliant. Halogen-free per TI's automotive-grade material declaration. -Q1 suffix indicates automotive-grade reliability and traceability.
