LMR36015SC3QRNXTQ1 - 60V 1.5A Sync Buck Converter | TI
MPN: LMR36015SC3QRNXTQ1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.78 | $37.80 |
| 100 | $3.36 | $336.00 |
| 500 | $3.02 | $1,510.00 |
| 1,000 | $2.69 | $2,690.00 |
| 3,000 | $2.35 | $7,050.00 |
LMR36015SC3QRNXTQ1 Overview
A buck (step-down) DC/DC converter is a switching voltage regulator that reduces a higher DC input voltage to a lower, well-regulated DC output voltage by rapidly switching an internal MOSFET and filtering the resulting PWM waveform through an LC network. Within the power management hierarchy, buck converters sit above LDOs and below isolated DC/DC modules; their higher efficiency at large input-to-output differentials makes them the workhorse of automotive, industrial, and telecom point-of-load rails. Synchronous topologies replace the rectifier diode with a second MOSFET to push peak efficiency into the mid-90% range.
Key specifications include 1.5 A continuous output current, 4.2 V to 60 V operating input range, 66 V transient tolerance, fixed 3.3 V output, and 400 kHz typical switching frequency (jumper-selectable up to 2.1 MHz for small external components). Advanced high-speed loop response and HotRod flip-chip packaging minimize EMI while maximizing power density. The pinout is designed for simple PCB layout, and the family shares pin compatibility with LMR36006 (60 V, 0.6 A) and LMR33620/LMR33630 (36 V, 2 A or 3 A) for scalable designs.
The HotRod package replaces traditional wire bonds with copper pillar flip-chip bumps, dramatically shrinking package-to-die ratio and lowering parasitic inductance. This enables the LMR36015-Q1 family to switch at 2.1 MHz while keeping EMI below CISPR 25 automotive limits, eliminating bulky shielding and snubber networks. Peak current mode control provides cycle-by-cycle overcurrent protection and simplifies loop compensation.
Typical applications include automotive infotainment and ADAS sensor power rails, industrial 24 V/48 V PLC and factory-automation supplies, telecom 48 V PoL converters, battery-powered motor drives, and any distributed power bus where 60 V tolerance is required. The device is also suited for USB-PD and general-purpose wide-Vin step-down designs.
When designing, verify that the input bulk capacitance handles 60 V plus ripple, and that the feedback loop compensation matches the chosen switching frequency. Use the TI WEBENCH Power Designer tool for validated BOM generation and thermal analysis.
This page synthesizes distributor pricing, AEC-Q100 qualification status, pin-compatible alternatives within the LMR360xx family, and practical design notes not collected on the manufacturer datasheet front page.
Drop-in alternatives for LMR36015SC3QRNXTQ1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LMR36015SC3QRNXRQ1
✅ Drop-In📋 Reference alternative (not in catalog)
LMR36015FSC3QRNXTQ1
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LMR36015SC5QRNXTQ1
✅ Drop-In📋 Reference alternative (not in catalog)
LMR36006QRNXTQ1
✅ Drop-In📋 Reference alternative (not in catalog)
LMR36015AQRNXTQ1
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LMR33630ADDAR
✅ Drop-In📋 Reference alternative (not in catalog)
LMR36015SC3QRNXTQ1 Maximum Ratings & Electrical Characteristics
| Topology | Synchronous Buck (Step-Down) |
| Input Voltage Range | 4.2 V to 60 V |
| Input Transient Tolerance | 66 V |
| Output Voltage | 3.3 V (Fixed) |
| Maximum Output Current | 1.5 A |
| Switching Frequency | 400 kHz typical (up to 2.1 MHz selectable) |
| Control Mode | Peak Current Mode |
| Integrated MOSFETs | High-side and Low-side |
| Dropout | 0.4 V at 1.5 A (typical) |
| Junction Temperature Range | -40 C to +150 C |
| Package | 12-pin VQFN-HR (RNX), HotRod flip-chip |
| Mounting Type | Surface Mount |
| AEC-Q100 Qualification | Yes (Automotive Grade 1) |
| RoHS Status | Compliant |
| Pin-Compatible Family | LMR36006 (0.6 A), LMR33620/LMR33630 (36 V, 2-3 A) |
LMR36015SC3QRNXTQ1 Pin Configuration
| Pin 1 | PGND — Power ground return for synchronous rectifier |
| Pin 2 | VIN — Input supply voltage (4.2 V to 60 V) |
| Pin 3 | VIN — Input supply voltage (tied to pin 2) |
| Pin 4 | EN/UVLO — Enable and programmable UVLO threshold |
| Pin 5 | RT — Timing resistor for switching frequency |
| Pin 6 | SS/TRK — Soft-start and tracking input |
| Pin 7 | FB — Feedback (tied to internal divider for fixed 3.3 V) |
| Pin 8 | VCC — Internal LDO output (bypass to AGND) |
| Pin 9 | AGND — Analog ground |
| Pin 10 | SW — Switch node - connect to output inductor |
| Pin 11 | SW — Switch node - tied to pin 10 |
| Pin 12 | BST — Bootstrap supply for high-side gate driver |
Typical Applications
LMR36015SC3QRNXTQ1 is suitable for 6 applications: Automotive Infotainment Power Rail, Industrial 24 V PLC and Sensor Supply, 48 V Telecom Point-of-Load Converter, Battery-Powered Motor Drive Auxiliary Rail, ADAS Sensor Power (Radar/Camera Modules), USB-PD and General Wide-Vin Distributed Bus.
Automotive Infotainment Power Rail
The LMR36015SC3QRNXTQ1's 60 V continuous (66 V transient) input withstands 12 V automotive load-dump up to ISO 7637-2 pulses, while its fixed 3.3 V output directly powers infotainment SoCs, USB hubs, and display backlight drivers. AEC-Q100 Grade 1 qualification allows direct placement on the head-unit PCB without derating, and the 1.5 A capability supports a complete small-cluster load. The HotRod flip-chip package keeps EMI below CISPR 25 Class 5 limits, eliminating shielding cans and reducing BOM cost versus conventional buck ICs.
Recommended
Industrial 24 V PLC and Sensor Supply
Factory-automation PLCs and distributed sensor nodes typically run from a regulated 24 V bus with spikes reaching 36 V. The LMR36015SC3QRNXTQ1 converts 24 V to 3.3 V with up to 1.5 A, feeding MCU, digital I/O isolators, and CAN transceivers. Peak current-mode control rejects input transients and provides cycle-by-cycle overcurrent protection, while 400 kHz-2.1 MHz switching lets designers trade efficiency for inductor size. The compact 12-pin VQFN-HR package fits standard 0805-passive footprints and supports high-density PLC layouts.
Recommended
48 V Telecom Point-of-Load Converter
Telecom equipment powered from 48 V backplanes benefits from the LMR36015SC3QRNXTQ1's 60 V input and 1.5 A capability, which comfortably handles a 48 V nominal rail with overshoot during hot-swap events. The synchronous topology delivers peak efficiency above 90%, reducing heat in densely packed line cards. Fixed 3.3 V output feeds DSPs, FPGAs, and PHY ICs without an external feedback divider. HotRod packaging minimizes radiated emissions that could couple into adjacent high-speed serial links.
Recommended
Battery-Powered Motor Drive Auxiliary Rail
Cordless tools and battery-powered motor drives use 12-36 V battery packs with regenerative spikes that can exceed 60 V. The LMR36015SC3QRNXTQ1 survives these events without external TVS clamping, providing a stable 3.3 V rail for motor-control MCUs, gate drivers, and current-sense amplifiers. 1.5 A continuous output handles gate-drive peak loads, and AEC-Q100 qualification simplifies the path to industrial/automotive-grade certifications. The 0.4 V typical dropout maximizes usable battery capacity at low charge states.
Recommended
ADAS Sensor Power (Radar/Camera Modules)
Advanced Driver Assistance Systems require compact, low-EMI power supplies for radar transceivers, camera serializers, and lidar front-ends. The LMR36015SC3QRNXTQ1's HotRod VQFN-HR package produces minimal radiated emissions, critical when the buck sits next to a 77 GHz radar LO. The fixed 3.3 V output at 1.5 A directly powers serializer ICs and microcontroller cores. AEC-Q100 Grade 1, 60 V input tolerance, and -40 C to +150 C junction range cover under-hood and behind-bumper automotive environments.
Recommended
USB-PD and General Wide-Vin Distributed Bus
USB-PD source controllers and general-purpose industrial equipment using 24-48 V distributed buses benefit from the LMR36015SC3QRNXTQ1's wide input range. The device steps down to 3.3 V for protocol MCUs and USB Type-C controllers, while its 1.5 A output supports auxiliary loads such as LEDs and small actuators. Synchronous rectification keeps efficiency above 90% even at light loads, and the small VQFN-HR footprint enables single-side PCB placement next to the Type-C connector.
Recommended
Recommended Products Summary
Engineering reference data for LMR36015SC3QRNXTQ1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LMR36015SC3QRNXRQ1 | LMR36015SC5QRNXTQ1 | LMR36006QRNXTQ1 | LMR33630ADDAR |
|---|---|---|---|---|---|
| Package | 12-pin VQFN-HR (RNX) | 12-pin VQFN-HR (RNX) - same | 12-pin VQFN-HR (RNX) - same | 12-pin VQFN-HR (RNX) - same | 12-pin VQFN-HR (RNX) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Input Voltage Range | 4.2 V to 60 V (66 V transient) | 4.2 V to 60 V - same | 4.2 V to 60 V - same | 4.2 V to 60 V - same | 4.2 V to 36 V |
| Output Voltage | 3.3 V (Fixed) | 3.3 V (Fixed) | 5.0 V (Fixed) | 3.3 V (Fixed) | Adjustable |
| Maximum Output Current | 1.5 A | 1.5 A | 1.5 A | 0.6 A | 3.0 A |
| Switching Frequency (max) | 2.1 MHz | 2.1 MHz | 2.1 MHz | 2.1 MHz | 2.1 MHz |
| AEC-Q100 Grade | Grade 1 | Grade 1 | Grade 1 | Grade 1 | Grade 1 |
| Dropout | 0.4 V at 1.5 A (typ) | 0.4 V at 1.5 A | 0.4 V at 1.5 A | 0.4 V at 0.6 A | 0.4 V at 3.0 A |
Key Differentiators
- Pin-compatible LMR360xx family covers 0.6A, 1.5A, and 36V/60V variants (vs LMR36006QRNXTQ1)
- HotRod package eliminates bond-wire inductance (vs LMR33630ADDAR)
- 60 V continuous / 66 V transient input rating (vs LMR33630ADDAR)
Design Notes
Use a 4-layer PCB with continuous ground plane directly under the package for the HotRod LNR36015SC3QRNXTQ1. Place the input ceramic capacitor (10 uF X7R 100 V 0805) within 2 mm of the VIN pins and the bootstrap capacitor (100 nF) within 1 mm of the BST pin. Keep the switch-node copper area small to minimize radiated EMI, but wide enough to carry 1.5 A continuous with < 50 C temperature rise.
Estimated: at VIN=24 V, VOUT=3.3 V, IOUT=1.5 A, the LMR36015SC3QRNXTQ1 dissipates approximately 1.2 W of switching and conduction loss. With the HotRod VQFN-HR package's typical theta_JA of 35 C/W on a 4-layer JEDEC board, junction rises ~42 C above ambient - well within the 150 C rating. Derate by 10-15% in enclosed housings with limited airflow.
The HotRod flip-chip package keeps the high-side gate-drive loop internal, dramatically reducing switching-node ringing. For CISPR 25 Class 5 compliance, add a small ferrite bead on the input and a 4.7 uF X7R bypass; avoid daisy-chaining input capacitors. Snubber components are typically unnecessary above the 2.1 MHz switching-frequency range.
Do not leave the EN/UVLO pin floating - tie through a 100 k resistor to VIN for automatic startup or to a logic signal for sequencing. The VCC bypass (1 uF X7R) must be placed within 1 mm of the VCC pin or the internal LDO oscillates. For the fixed 3.3 V SC3 variant, do not populate an external feedback divider; the FB pin is internally tied.
Compliance Information
AEC-Q100 Grade 1 qualified per TI datasheet. RoHS and REACH compliant. Halogen-free per JEDEC JS709B.
