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Texas Instruments LMR33630AQRNXTQ1
- Part No.:
- LMR33630AQRNXTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR33630AQRNXTQ1.pdf
- Description:
- IC REG BUCK ADJ 3A 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:388
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Product details
Overview
LMR33630AQRNXTQ1 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 fixed 400 kHz switching frequency. It integrates 75 mΩ/50 mΩ RDS(on) MOSFETs, peak-current-mode control, and a 68 ns minimum on-time for high-efficiency operation in infotainment power rails.
For engineers reviewing the LMR33630AQRNXTQ1 datasheet, LMR33630AQRNXTQ1 pinout, LMR33630AQRNXTQ1 application, or LMR33630AQRNXTQ1 equivalent, key selection criteria include its HotRod™ VQFN package with wettable flanks, precision enable threshold (1.231 V typ), power-good flag with glitch filtering, and functional safety documentation support for ASIL-B system integration.
Technical Context
The LMR33630AQRNXTQ1 implements peak-current-mode control with integrated compensation, enabling stable regulation without external loop components. Its auto-mode operation dynamically transitions between PWM (heavy load) and PFM with diode emulation (light load), maintaining >95% peak efficiency while reducing quiescent current to 25 µA during operation and 5 µA in shutdown.
Designed for rugged automotive environments, it features cycle-by-cycle current limiting, hiccup-mode short-circuit protection (94 ms off-time), thermal shutdown at 165°C, and input UVLO tied to internal 5-V LDO (VCC), with precision EN thresholds (1.231 V rising, 0.3 V hysteresis) enabling reliable system-level power sequencing.
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, telematics processors, and display backlight drivers |
| Switching Frequency | 400 kHz - enables use of compact 2.2 µH inductors and reduces EMI in mid-frequency band |
| RDS(on) (HS/LS) | 75 mΩ / 50 mΩ - minimizes conduction loss and thermal rise at full load in 3 mm × 2 mm VQFN |
| Quiescent Current | 25 µA operating / 5 µA shutdown - extends battery life in always-on vehicle modules |
| Feedback Reference | 1.000 V ±1.5% - ensures ±1.5% output regulation accuracy over temperature and line/load |
| Min. On-Time | 68 ns - enables 3.3 V output from 3.8 V input (92% duty cycle) without dropout |
Pinout & Package
LMR33630AQRNXTQ1 uses a 12-pin VQFN (RNX) package measuring 3.00 mm × 2.00 mm × 0.85 mm with wettable flanks for automated optical inspection and enhanced thermal performance. The symmetrical VIN/PGND layout reduces input loop inductance and EMI.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 | PGND | Power ground return path for high-current switch node; must be low-inductance connection to AGND and input capacitor |
| 2, 10 | VIN | Main input supply (3.8–36 V); requires local 10 µF ceramic bypass capacitor directly to PGND |
| 3 | NC | No internal connection; used on PCB to route CBOOT capacitor to SW pin in VQFN layout |
| 4 | BOOT | Bootstrap supply for high-side driver; requires 100 nF ceramic capacitor to SW pin |
| 5 | VCC | Internal 5-V LDO output; powers control circuitry and can source PG flag logic (1 µF bypass required) |
| 6 | AGND | Analog ground reference for FB, EN, PG; separate low-noise trace to PGND star point |
| 7 | FB | Resistive divider feedback input; sets output voltage via VOUT = 1.0 V × (1 + RFBT/RFBB) |
| 8 | PG | Open-drain power-good flag; pulls low during startup, fault, or EN=low; requires external pullup |
| 9 | EN | Enable input with precision 1.231 V rising threshold; connects directly to VIN if UVLO not needed |
| 12 | SW | Switch node output; connects to power inductor and CBOOT capacitor; routed to NC pad on PCB |
Key Features
| Feature | Design Value |
|---|---|
| Functional Safety Documentation | Available FIT data, FMEA reports, and safety analysis templates for ISO 26262 ASIL-B system integration |
| Integrated Compensation Network | Eliminates need for external Type II/III compensation components, reducing BOM count and layout complexity |
| HotRod™ Package with Wettable Flanks | Enables AOI-compatible solder joint inspection and achieves 23.3°C/W junction-to-board thermal resistance |
| Auto-Mode PFM/PWM Transition | Maintains >85% efficiency at 1 mA load while delivering >95% peak efficiency at full 3 A load |
| Power-Good Flag with Glitch Filtering | 60–170 µs glitch rejection window prevents false resets during transient load steps or line disturbances |
Applications
| Infotainment USB Charging | Telematics Control Unit |
|---|---|
Use Scenario: Powering dual-port 5 V/2.4 A USB charging circuits in center-stack head units under varying battery conditions (9–16 V nominal, down to 6 V cold-crank). IC Role / Device Role / Timing Role: Primary buck regulator providing regulated 5 V rail with fast transient response and hiccup-mode short-circuit protection during cable faults. Use Value: 68 ns min-on-time enables regulation at 6 V input; 3 A rating supports simultaneous charging; PG flag synchronizes host MCU boot sequence. | Use Scenario: Supplying 3.3 V core voltage to LTE/C-V2X modems and microcontrollers in TCU modules exposed to wide ambient temperatures (−40°C to +125°C). IC Role / Device Role / Timing Role: High-reliability point-of-load converter with AEC-Q100 Grade 1 qualification and thermal shutdown at 165°C. Use Value: 25 µA quiescent current extends sleep-mode battery life; VCC pin provides clean 5 V logic supply for modem reset signaling. |
| Automotive Cluster Display | ADAS Camera Power |
Use Scenario: Generating 12 V backlight supply for TFT instrument clusters using boost-buck topology with external flyback transformer. IC Role / Device Role / Timing Role: Adjustable-output buck controller (1 V–24 V) driving external N-channel MOSFET in synchronous rectified flyback configuration. Use Value: 24 V max output supports LED string requirements; 400 kHz switching allows compact magnetics; FB pin accuracy ensures consistent brightness across temperature. | Use Scenario: Providing isolated 5 V/1 A power to front-facing ADAS cameras mounted behind windshield, subject to thermal cycling and EMI from nearby radar. IC Role / Device Role / Timing Role: Low-EMI primary-side regulator feeding isolated DC/DC module, leveraging HotRod™ layout and parallel VIN/PGND paths. Use Value: Symmetrical input layout reduces common-mode EMI by >6 dB; wettable flanks ensure solder joint reliability in high-vibration environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR33630BQRNXTQ1 | 1.4 MHz switching frequency; identical package, RDS(on), and current rating | Better suited for space-constrained designs requiring smaller inductors and reduced output capacitance | Select when EMI filtering targets higher frequencies or board area is limited |
| TPS543320RHLT | 3.5 A rating, 2.2 MHz operation, PMBus interface, and digital loop compensation | Supports dynamic voltage scaling and telemetry reporting in advanced ADAS ECUs | Select when programmability, telemetry, or higher current margin is required |
Compared with LMR33630BQRNXTQ1, the LMR33630AQRNXTQ1 offers lower EMI in mid-band frequencies and simpler layout due to 400 kHz operation; versus TPS543320RHLT, it provides lower cost, smaller footprint, and no firmware dependency-ideal for cost-sensitive, high-volume automotive modules where analog control suffices.
Availability
LMR33630AQRNXTQ1 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 production lifecycles.
Supply support for LMR33630AQRNXTQ1 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 ICs, with decades of automotive qualification expertise and AEC-Q100-compliant manufacturing.
The LMR33630-Q1 product line delivers easy-to-use, high-efficiency synchronous buck regulators optimized for automotive subsystems demanding AEC-Q100 Grade 1 reliability, functional safety readiness, and minimal external component count.
FAQ
What is the maximum output voltage supported by the LMR33630AQRNXTQ1?
The LMR33630AQRNXTQ1 supports an adjustable output voltage range from 1 V to 24 V, set via an external resistive divider on the FB pin. The maximum output is limited to 95% of VIN under certain conditions; however, the guaranteed specification per datasheet is 24 V at full 3 A load with VIN ≥ 25.3 V. This makes the LMR33630AQRNXTQ1 suitable for powering 12 V displays, 5 V USB ports, and 3.3 V logic rails in automotive domains.
Does the LMR33630AQRNXTQ1 require external compensation components?
No, the LMR33630AQRNXTQ1 integrates a complete compensation network internally, eliminating the need for external Type II or Type III compensation components. This simplifies design, reduces bill-of-materials count, and improves layout robustness-especially critical in automotive applications where reliability and time-to-market are paramount. The internal compensation is optimized for standard 2.2 µH inductors and 22 µF output capacitors.
How does the power-good (PG) flag behave during startup and fault conditions for the LMR33630AQRNXTQ1?
The LMR33630AQRNXTQ1 PG pin is an open-drain output that remains low for ~4 ms after EN is asserted, then goes high when output voltage reaches 95% of target and remains within regulation windows (±3% to ±5%). It pulls low during startup, thermal shutdown, current-limit hiccup, or EN deactivation. A built-in 60–170 µs glitch filter prevents false triggering during transient load steps. The PG signal can be pulled up to VCC or VOUT via a 100-kΩ resistor.
What thermal performance can be expected from the LMR33630AQRNXTQ1 in a typical 4-layer JEDEC board layout?
In a standard 4-layer JEDEC test board per JESD 51-7, the LMR33630AQRNXTQ1 in its 3 mm × 2 mm VQFN package achieves a junction-to-board thermal resistance (RθJB) of 23.3°C/W and junction-to-ambient (RθJA) of 72.5°C/W. With 3 A load at 12 V input/5 V output, typical junction temperature rise is ~35°C above ambient-well within the −40°C to +125°C operating range. Layout best practices (copper pour under PGND/AGND, thermal vias under exposed pad) further improve thermal performance.
Is the LMR33630AQRNXTQ1 pin-compatible with other variants in the LMR33630-Q1 family?
Yes, all LMR33630-Q1 variants-including LMR33630AQRNXTQ1 (400 kHz), LMR33630BQRNXTQ1 (1.4 MHz), and LMR33630CQRNXTQ1 (2.1 MHz)-share identical 12-pin VQFN (RNX) packaging, pinout, and footprint. This enables frequency optimization without PCB redesign: simply swap the part and adjust the output filter components (inductor and capacitor values) per the selected switching frequency.
LMR33630AQRNXTQ1 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 (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 12-VQFN-HR (3x2)
LMR33630AQRNXTQ1 FAQ
1.How can I place an order for LMR33630AQRNXTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33630AQRNXTQ1 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 LMR33630AQRNXTQ1 reliable?
The price and inventory of LMR33630AQRNXTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33630AQRNXTQ1 is usually 5 days.
3.What payment methods are accepted for LMR33630AQRNXTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33630AQRNXTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33630AQRNXTQ1?
LMR33630AQRNXTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33630AQRNXTQ1 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 LMR33630AQRNXTQ1?
For technical support, including LMR33630AQRNXTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33630AQRNXTQ1 requirements.
6.How does Aetrix verify that LMR33630AQRNXTQ1 is sourced from the original manufacturer or authorized distributors?
All LMR33630AQRNXTQ1 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 LMR33630AQRNXTQ1 meets industry standards.
7.What is the process for return or replacement of LMR33630AQRNXTQ1?
All LMR33630AQRNXTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR33630AQRNXTQ1, 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 LMR33630AQRNXTQ1 part is unused and in its original packaging.
Return procedure for LMR33630AQRNXTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMR33630AQRNXTQ1 Tags
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