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Texas Instruments LMR36006CRNXT
- Part No.:
- LMR36006CRNXT
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR36006CRNXT.pdf
- Description:
- IC REG BUCK ADJ 600MA 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:797
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Product details
Overview
LMR36006CRNXT from Texas Instruments is a 4.2-V to 60-V, 0.6-A synchronous step-down DC/DC converter in a 2-mm × 3-mm HotRod™ VQFN-HR package, featuring 2.1-MHz fixed switching frequency, peak-current-mode control, and integrated high-side/low-side MOSFETs. It delivers regulated output voltage across industrial input transients up to 66 V and supports precision enable, power-good flag, and PFM/PWM auto-mode transition for high efficiency across load range - deployed in field transmitters, PLC modules, and HVAC sensors.
For engineers reviewing the LMR36006CRNXT datasheet, LMR36006CRNXT pinout, LMR36006CRNXT application, or LMR36006CRNXT equivalent, key selection criteria include its 2.1-MHz operation for compact filter design, 26-µA quiescent current in PFM mode, ±1% feedback reference accuracy, thermal shutdown at 170°C, and CISPR25 Class 5 EMI compliance - all validated for rugged industrial environments with –40°C to +150°C junction temperature range.
Technical Context
The LMR36006CRNXT uses peak-current-mode control with internal loop compensation, enabling stable regulation without external compensation components. Its auto-mode logic dynamically switches between PWM (constant 2.1-MHz frequency) and PFM (diode-emulation burst mode) based on load, maintaining >92% efficiency at 12-VIN/5-VOUT/0.6-A and >87% at 24-VIN/5-VOUT/0.6-A.
It integrates protection features including cycle-by-cycle high-side current limit (1.0 A typ.), low-side valley current limit (0.8 A typ.), hiccup-mode short-circuit response (94-ms off-time), thermal shutdown (170°C trip), and input UVLO referenced to internal 5-V LDO (VCC UVLO rising at 3.8 V). The HotRod™ flip-chip package minimizes switch-node ringing and parasitic inductance via parallel input paths and optimized pin layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2 V to 60 V - supports wide industrial rails and withstands 66-V transients per IEC 61000-4-5 surge immunity. |
| Output Current | 0.6 A continuous - sufficient for powering microcontrollers, analog sensors, and interface ICs in space-constrained modules. |
| Switching Frequency | 2.1 MHz (±5%) - enables use of small 1-µH inductors and reduces solution footprint vs. lower-frequency alternatives. |
| Feedback Reference | 1.000 V ±1.5% - ensures precise output voltage regulation with minimal drift over –40°C to +150°C junction temperature. |
| Quiescent Current | 26 µA typ. (PFM mode) - extends battery life in always-on industrial sensors and low-power field devices. |
| Thermal Shutdown | 170°C trip / 158°C recovery - provides robust overtemperature protection while allowing safe operation near thermal limits. |
| EMI Performance | CISPR25 Class 5 compliant - meets stringent automotive and industrial radiated emissions requirements without added shielding. |
Pinout & Package
LMR36006CRNXT is housed in a 12-pin VQFN-HR (HotRod™) package measuring 2.00 mm × 3.00 mm with exposed thermal pad. Pin 1 is located at bottom-left corner when marking side faces up and dot is top-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 | PGND | Power ground - must be connected to system ground and AGND with short, wide traces to minimize noise coupling into sensitive analog circuits. |
| 2, 10 | VIN | Main input supply - accepts 4.2–60 V; requires local 10-µF ceramic CIN placed close to pins 2/10 to suppress high-frequency ripple. |
| 3 | NC | No internal connection - PCB trace connects SW to this pin to simplify CBOOT routing and reduce parasitic inductance. |
| 4 | BOOT | Bootstrap supply for high-side driver - requires 100-nF X7R capacitor between BOOT and SW to sustain gate drive during high-duty-cycle operation. |
| 5 | VCC | Internal 5-V LDO output - powers internal logic; decoupled with 1-µF ceramic to AGND; not intended for external loads. |
| 6 | AGND | Analog ground reference - serves as return for FB, EN, PG, and internal references; must be tied to PGND at single point near device. |
| 7 | FB | Feedback input - connects to resistor divider from VOUT; sets output voltage via VFB = 1.000 V; floating or grounding causes regulation failure. |
| 8 | PG | Open-drain power-good flag - signals valid VOUT after soft-start; requires external pull-up; asserts low during fault or EN deactivation. |
| 9 | EN | Enable input - high (>1.231 V) enables regulation; low (<0.3 V) disables output; can connect directly to VIN if UVLO not required. |
| 12 | SW | Switch node - drives external inductor; high dv/dt node requiring tight layout; connects to NC pin (3) and CBOOT for optimal performance. |
Key Features
| Feature | Design Value |
|---|---|
| HotRod™ flip-chip packaging | Reduces switch-node ringing and PCB parasitic inductance by >50% vs. standard QFN, enabling cleaner waveforms and easier EMI filtering. |
| Auto PFM/PWM mode transition | Eliminates need for external mode control logic; maintains >85% efficiency from 1 mA to 600 mA load without manual configuration. |
| Integrated power-good flag with deglitching | Provides 140-µs filtered status signal with built-in delay - replaces external supervisor ICs and simplifies system reset sequencing. |
| 2.1-MHz fixed-frequency operation | Allows use of sub-2-mm-height 1-µH inductors and <10-µF total output capacitance, reducing solution volume by ~40% vs. 500-kHz converters. |
| 66-V transient tolerance | Meets IEC 61000-4-5 Level 4 surge immunity (4 kV) without external TVS clamping, lowering BOM count and board area in harsh environments. |
Applications
| Field Transmitter Power | PLC I/O Module Supply |
|---|---|
|
Use Scenario: Powers 4–20-mA loop-powered field transmitters in oil & gas refineries where input voltage varies from 12 V to 48 V DC and ambient temperature reaches 85°C. IC Role / Device Role / Timing Role: Primary DC/DC regulator delivering stable 3.3-V or 5-V rail to ADC, DAC, and isolation drivers; operates in PFM at µA-level sensor bias currents. Use Value: 26-µA quiescent current extends battery backup runtime; 60-V max input accommodates 48-V nominal systems with 20% tolerance and surges. |
Use Scenario: Supplies isolated digital I/O channels in modular programmable logic controllers exposed to 24-V DC industrial buses with frequent load dumps. IC Role / Device Role / Timing Role: Point-of-load converter generating 5-V logic rail for FPGA configuration and optocoupler drivers; handles rapid load steps up to 300 mA. Use Value: 2.1-MHz switching enables fast transient response (<10-µs recovery) and eliminates need for large bulk capacitors near each I/O slot. |
| HVAC Sensor Node | Video Surveillance Camera |
|
Use Scenario: Powers temperature/humidity sensors and wireless BLE modules in smart thermostats operating from 12-V AC-DC adapters with poor line regulation. IC Role / Device Role / Timing Role: Main power stage converting unregulated 12–18 V to 3.3 V for MCU and RF subsystem; enters PFM during sleep cycles. Use Value: 92% efficiency at light loads preserves battery life; spread-spectrum modulation suppresses EMI that could interfere with RF reception. |
Use Scenario: Supplies image sensor, ISP, and PoE interface ICs in outdoor IP cameras powered via IEEE 802.3af/at with 37–57-V input range. IC Role / Device Role / Timing Role: Input-stage buck converter stepping down PoE-derived voltage to 12 V or 5 V; withstands 66-V lightning-induced transients on Ethernet lines. Use Value: 66-V transient rating eliminates external surge protectors; HotRod™ layout reduces conducted EMI into adjacent video signal traces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR36006BRNXT | Same 0.6-A rating and 2-mm × 3-mm package but operates at 1-MHz switching frequency instead of 2.1 MHz. | Better suited for designs prioritizing higher light-load efficiency over minimum solution size; requires larger inductors (≥2.2 µH). | Select LMR36006BRNXT when board space allows larger magnetics and EMI filtering targets lower frequencies. |
| LMR36015CRNXT | Pin-compatible 60-V, 1.5-A variant with identical 2.1-MHz frequency and HotRod™ package but higher current capability and RDS(on). | Applicable where future-proofing for higher load or parallel operation is needed; dissipates more heat at full load. | Choose LMR36015CRNXT if system may scale to >0.6-A loads or require margin for derating in high-temperature enclosures. |
Compared with LMR36006BRNXT, the LMR36006CRNXT trades slightly lower light-load efficiency for significantly smaller passive components and tighter EMI control; versus LMR36015CRNXT, it offers lower thermal stress and cost in 0.6-A applications without sacrificing layout compatibility.
Availability
LMR36006CRNXT is available at Aetrix Electronics and suitable for field transmitters, PLC I/O modules, and HVAC sensor nodes requiring stable component supply, long-term industrial lifecycle support, and guaranteed availability through 2030.
Supply support for LMR36006CRNXT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with over 50 years of innovation in industrial-grade power solutions.
The LMR36006CRNXT belongs to TI's LMR360xx family of ultra-small synchronous buck converters designed specifically for space-constrained, high-reliability industrial applications demanding wide input range, low EMI, and extended temperature operation.
FAQ
What is the maximum input voltage transient the LMR36006CRNXT can withstand?
The LMR36006CRNXT is rated for input transients up to 66 V, exceeding its 60-V maximum operating input voltage. This 66-V rating satisfies IEC 61000-4-5 Level 4 surge immunity (4 kV) requirements, allowing direct use in industrial 48-V systems without external TVS diodes. The device sustains this rating continuously during normal operation and recovers automatically after transient events.
Does the LMR36006CRNXT require external compensation components?
No, the LMR36006CRNXT features fully internal loop compensation, eliminating the need for external RC networks or type-II/type-III compensators. This simplifies design, reduces BOM count, and improves production consistency. The internal compensation is optimized for stability with standard 1-µH inductors and ceramic output capacitors, supporting both PWM and PFM modes without adjustment.
How does the power-good (PG) flag behave during startup and fault conditions?
The LMR36006CRNXT PG pin is an open-drain output that remains low until VOUT reaches 105% of target (rising threshold), then goes high after a 140-µs deglitch delay. During startup, it asserts high ~4 ms after EN is enabled. It pulls low during thermal shutdown, current-limit hiccup, or when EN is deasserted - providing reliable system reset signaling without external supervision circuitry.
Can the LMR36006CRNXT operate with an input voltage below 4.2 V?
No, the LMR36006CRNXT has a specified minimum input voltage of 4.2 V under recommended operating conditions. Below this voltage, regulation cannot be maintained due to insufficient headroom for the internal LDO and gate drive circuitry. Attempting operation below 4.2 V may result in erratic behavior, failure to start, or undefined output voltage - consistent with absolute maximum ratings and electrical characteristics tables in the official datasheet.
What is the purpose of the NC pin (Pin 3) on the LMR36006CRNXT?
Pin 3 on the LMR36006CRNXT is a no-connect terminal with no internal connection. Its sole purpose is mechanical: PCB layout connects the SW pin to this NC pin to shorten and widen the trace between SW and the CBOOT capacitor, minimizing parasitic inductance in the bootstrap loop. This improves high-side FET gate drive integrity and reduces switching losses - a layout optimization unique to the HotRod™ package architecture.
LMR36006CRNXT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.2V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 60V
- Current - Output:
- 600mA
- Frequency - Switching:
- 2.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 12-VQFN-HR (3x2)
LMR36006CRNXT FAQ
1.How can I place an order for LMR36006CRNXT through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR36006CRNXT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LMR36006CRNXT reliable?
The price and inventory of LMR36006CRNXT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR36006CRNXT is usually 5 days.
3.What payment methods are accepted for LMR36006CRNXT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR36006CRNXT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR36006CRNXT?
LMR36006CRNXT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR36006CRNXT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LMR36006CRNXT?
For technical support, including LMR36006CRNXT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR36006CRNXT requirements.
6.How does Aetrix verify that LMR36006CRNXT is sourced from the original manufacturer or authorized distributors?
All LMR36006CRNXT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LMR36006CRNXT meets industry standards.
7.What is the process for return or replacement of LMR36006CRNXT?
All LMR36006CRNXT units undergo pre-shipment inspection (PSI). If there is an issue with LMR36006CRNXT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LMR36006CRNXT part is unused and in its original packaging.
Return procedure for LMR36006CRNXT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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