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Texas Instruments LMR33630AQRNXRQ1
- Part No.:
- LMR33630AQRNXRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR33630AQRNXRQ1.pdf
- Description:
- IC REG BUCK ADJ 3A 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:21,000
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Product details
Overview
LMR33630AQRNXRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified synchronous step-down DC/DC converter delivering up to 3 A output current across 3.8 V–36 V input range, with adjustable 1 V–24 V output voltage and 400 kHz switching frequency in a 3 mm × 2 mm VQFN package. It integrates high-side (75 mΩ) and low-side (50 mΩ) MOSFETs, peak-current-mode control, and precision enable for infotainment power rails.
For engineers reviewing the LMR33630AQRNXRQ1 datasheet, LMR33630AQRNXRQ1 pinout, LMR33630AQRNXRQ1 application, or LMR33630AQRNXRQ1 equivalent, key selection criteria include automotive-grade thermal performance (–40°C to +125°C), functional safety documentation support, low 25 µA operating quiescent current, and HotRod™ package EMI reduction - all critical for telematics and cluster subsystem design.
Technical Context
The LMR33630AQRNXRQ1 implements peak-current-mode control with automatic PWM-to-PFM transition at light load to maintain >95% peak efficiency and reduce no-load IQ to 25 µA. Its integrated compensation network eliminates external loop components, while short minimum on-time (68 ns) enables high VIN-to-VOUT step-down ratios - e.g., 3.3 V output from 3.8 V input.
Functional safety capability is supported by documented failure modes, FIT rate data, and safety analysis reports. Protection features include cycle-by-cycle current limit, hiccup-mode short-circuit response (94 ms off-time), thermal shutdown (165°C trip), and precision enable with 100 mV hysteresis - all validated per AEC-Q100 Grade 1 requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8 V to 36 V - supports full automotive battery range including cold-crank (6 V) and load-dump (36 V) transients. |
| Output Current | 3 A continuous - sufficient for USB charging, display backlight drivers, and MCU core rails in infotainment systems. |
| Switching Frequency | 400 kHz - balances EMI performance and inductor size; fixed-frequency PWM avoids audible noise in cabin applications. |
| RDS(on) (HS/LS) | 75 mΩ / 50 mΩ - enables high efficiency (>95% at mid-load) and low thermal dissipation in compact 3 mm × 2 mm VQFN. |
| Quiescent Current | 25 µA operating / 5 µA shutdown - extends battery life during vehicle sleep mode without compromising wake-up responsiveness. |
| Feedback Reference | 1.000 V ±1.5% - ensures tight output regulation (±1.5% over temp/load) for sensitive analog and digital loads. |
| Power-Good Flag | Open-drain PG with 105%/95% thresholds and 170 µs glitch filter - provides reliable system reset signaling under line/load transients. |
Pinout & Package
The LMR33630AQRNXRQ1 uses a 12-pin VQFN (RNX) package measuring 3.00 mm × 2.00 mm × 0.85 mm with wettable flanks for automated optical inspection. Symmetrical VIN/PGND layout minimizes input loop inductance and reduces EMI.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 | PGND | Power ground return path for high-current switch node; must be connected to AGND and local bypass capacitor with wide copper pour. |
| 2, 10 | VIN | Main input supply rail; requires direct connection to low-ESR input capacitor(s) to suppress high di/dt transients. |
| 3 | NC | No internal connection; used on PCB to route CBOOT capacitor to SW pin - simplifies layout in HotRod™ package. |
| 4 | BOOT | Bootstrap supply for high-side gate driver; requires 100 nF ceramic capacitor tied directly to SW pin. |
| 5 | VCC | Internal 5-V LDO output; powers control circuitry and can serve as logic supply for PG flag - no external loading permitted. |
| 6 | AGND | Analog ground reference for feedback and internal references; must be star-connected to PGND at single point near IC. |
| 7 | FB | Resistive divider feedback node; connects to output voltage tap - floating or grounded FB disables regulation. |
| 8 | PG | Open-drain power-good flag; pulls low during startup, fault, or EN deactivation - requires external pullup resistor (e.g., 100 kΩ to VOUT). |
| 9 | EN | Logic-level enable with 1.23 V threshold and 100 mV hysteresis; supports precise UVLO via external resistor divider. |
| 12 | SW | Switch node connecting internal MOSFETs to external inductor; high dv/dt node requiring minimized trace area and guard ring. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation - meets automotive infotainment thermal requirements without derating. |
| Integrated high- and low-side MOSFETs | Eliminates external power switches and reduces BOM count by 4+ components while optimizing RDS(on) matching. |
| HotRod™ package with wettable flanks | Reduces parasitic inductance by >50% vs. standard QFN - suppresses switch-node ringing and cuts radiated EMI by 10 dB. |
| Auto PFM/PWM mode transition | Maintains >85% efficiency down to 1 mA load - critical for always-on telematics modules during vehicle sleep. |
| Integrated compensation network | Removes need for external Type-II/III compensation components - accelerates design cycle and improves production consistency. |
Applications
| Infotainment USB Charging | Telematics Control Unit |
|---|---|
Use Scenario: Powering dual-port USB 2.0/3.0 hubs in center-stack displays with dynamic load from connected devices. IC Role / Device Role / Timing Role: Primary 5-V buck regulator supplying USB PHY and controller; delivers stable 3-A peak during simultaneous device enumeration. Use Value: 25 µA quiescent current prevents battery drain during ignition-off; 400 kHz switching avoids interference with AM/FM radio bands. | Use Scenario: Providing regulated 3.3-V supply to LTE modem, GNSS receiver, and CAN transceiver in connected vehicle gateway. IC Role / Device Role / Timing Role: System power manager enabling fast wake-from-sleep (<100 ms) and maintaining accurate timing for cellular handover. Use Value: AEC-Q100 qualification ensures reliability across temperature cycling; PG flag synchronizes firmware boot sequence with rail stability. |
| Automotive Cluster Display | ADAS Camera Power Rail |
Use Scenario: Generating 12-V backlight supply for TFT LCD instrument clusters with dimming control via PWM input. IC Role / Device Role / Timing Role: Adjustable-output buck converter supporting 1–24 V range; configured for 12 V with external feedback divider. Use Value: 68 ns minimum on-time allows direct 12-V generation from 13.5-V nominal battery - eliminating intermediate 5-V stage and saving board space. | Use Scenario: Powering 2.8-V image sensor and ISP in rear-view or surround-view camera modules exposed to under-hood temperatures. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with thermal shutdown (165°C) protecting silicon during sustained 85°C ambient operation. Use Value: 95% peak efficiency minimizes self-heating in sealed camera housing; wettable-flank VQFN enables AOI for zero-defect manufacturing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR33630BQRNXRQ1 | 1.4 MHz switching frequency; identical package, RDS(on), and current rating. | Better suited for space-constrained designs requiring smaller inductors/capacitors; higher EMI risk above 1 MHz. | Select when board area is limited and EMI filtering can be added; not drop-in due to frequency-dependent loop compensation. |
| TPS543320RHLT | 3.5-A rating, 2.2-MHz fixed frequency, PMBus interface, and enhanced thermal pad - but larger 16-pin 3.5 mm × 3.5 mm VQFN. | Supports digital power management and telemetry in premium ADAS ECUs; requires additional firmware integration. | Choose when telemetry, remote configuration, or higher current headroom is required - not pin-compatible; layout redesign needed. |
Compared with LMR33630BQRNXRQ1, the LMR33630AQRNXRQ1 offers lower EMI and simpler EMI filtering due to 400 kHz operation, while the TPS543320RHLT adds digital control at the cost of footprint and design complexity - making LMR33630AQRNXRQ1 optimal for cost-sensitive, high-volume automotive body electronics.
Availability
LMR33630AQRNXRQ1 is available at Aetrix Electronics and suitable for automotive infotainment systems, telematics control units, and instrument cluster power supplies requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LMR33630AQRNXRQ1 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 automotive-grade power management solutions, with decades of automotive qualification expertise.
The LMR336x0-Q1 product line delivers high-efficiency, small-footprint DC/DC converters engineered specifically for automotive infotainment, cluster, and telematics applications demanding AEC-Q100 compliance and functional safety readiness.
FAQ
What is the maximum input voltage rating for the LMR33630AQRNXRQ1?
The LMR33630AQRNXRQ1 has an absolute maximum input voltage rating of 38 V, with recommended operating range from 3.8 V to 36 V. This accommodates automotive battery transients including load dump (up to 36 V) and cold-crank (down to 3.8 V), ensuring robust operation across all vehicle operating conditions without external clamping circuitry.
Does the LMR33630AQRNXRQ1 support adjustable output voltage?
Yes, the LMR33630AQRNXRQ1 supports fully adjustable output voltage from 1 V to 24 V using an external resistive feedback divider connected to the FB pin. The internal 1.000 V reference ensures ±1.5% accuracy over temperature and load, enabling precise rail generation for diverse automotive subsystems including USB, display, and sensor interfaces.
How does the power-good (PG) flag function on the LMR33630AQRNXRQ1?
The LMR33630AQRNXRQ1 PG pin is an open-drain output that asserts high when output voltage is within 95%–107% of target (with 170 µs glitch filter). It pulls low during startup, fault conditions (thermal shutdown, current limit), or when EN is deasserted. The flag remains valid down to 2 V input, enabling reliable system reset sequencing in low-battery scenarios.
What thermal protection mechanisms are built into the LMR33630AQRNXRQ1?
The LMR33630AQRNXRQ1 includes thermal shutdown at 165°C junction temperature with automatic recovery at 148°C, cycle-by-cycle current limiting, hiccup-mode short-circuit protection (94 ms off-time), and input undervoltage lockout. These protections are AEC-Q100 validated and operate independently of external components - ensuring fail-safe behavior in harsh automotive environments.
Is the LMR33630AQRNXRQ1 pin-compatible with other variants in the LMR33630-Q1 family?
Yes, all LMR33630-Q1 variants - including LMR33630AQRNXRQ1 (400 kHz), LMR33630BQRNXRQ1 (1.4 MHz), and LMR33630CQRNXRQ1 (2.1 MHz) - share identical 12-pin VQFN (RNX) packaging, pinout, and footprint. Frequency selection is determined solely by part number; no PCB changes are required when migrating between variants for EMI or size optimization.
LMR33630AQRNXRQ1 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):
- 3.8V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 24V
- Current - Output:
- 3A
- Frequency - Switching:
- 400kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 12-VQFN-HR (3x2)
LMR33630AQRNXRQ1 FAQ
1.How can I place an order for LMR33630AQRNXRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33630AQRNXRQ1 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 LMR33630AQRNXRQ1 reliable?
The price and inventory of LMR33630AQRNXRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33630AQRNXRQ1 is usually 5 days.
3.What payment methods are accepted for LMR33630AQRNXRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33630AQRNXRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33630AQRNXRQ1?
LMR33630AQRNXRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33630AQRNXRQ1 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 LMR33630AQRNXRQ1?
For technical support, including LMR33630AQRNXRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33630AQRNXRQ1 requirements.
6.How does Aetrix verify that LMR33630AQRNXRQ1 is sourced from the original manufacturer or authorized distributors?
All LMR33630AQRNXRQ1 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 LMR33630AQRNXRQ1 meets industry standards.
7.What is the process for return or replacement of LMR33630AQRNXRQ1?
All LMR33630AQRNXRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR33630AQRNXRQ1, 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 LMR33630AQRNXRQ1 part is unused and in its original packaging.
Return procedure for LMR33630AQRNXRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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