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Texas Instruments LMR33630BQRNXTQ1
- Part No.:
- LMR33630BQRNXTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR33630BQRNXTQ1.pdf
- Description:
- IC REG BUCK ADJ 3A 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:106
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Product details
Overview
LMR33630BQRNXTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified synchronous step-down DC/DC converter delivering 3 A output current across 3.8 V to 36 V input and 1 V to 24 V adjustable output, featuring 1.4 MHz fixed switching frequency, 75 mΩ/50 mΩ integrated high-side/low-side MOSFETs, and peak efficiency >95% in a 3 mm × 2 mm VQFN package with wettable flanks - deployed in telematics control units and infotainment USB charging rails.
For engineers reviewing the LMR33630BQRNXTQ1 datasheet, LMR33630BQRNXTQ1 pinout, LMR33630BQRNXTQ1 application, or LMR33630BQRNXTQ1 equivalent, key selection considerations include its 1.4 MHz frequency option, functional safety documentation support, precision enable thresholds (VEN-H = 1.231 V), power-good flag timing (tPG = 60–170 µs), and thermal shutdown at 165°C with 148°C recovery.
Technical Context
The LMR33630BQRNXTQ1 implements peak-current-mode control with automatic PWM-to-PFM transition for light-load efficiency optimization, supported by internal loop compensation and a 68 ns minimum on-time enabling high VIN-to-VOUT step-down ratios (e.g., 3.8 V → 3.3 V). Its HotRod™ VQFN package features symmetrical VIN/PGND pin layout to cancel input magnetic fields and reduce EMI.
Functional safety capability is enabled via documented design aids including failure mode analysis, FIT rate data, and safety manual support. Protection architecture includes cycle-by-cycle current limit, hiccup-mode short-circuit response (94 ms off-time), thermal shutdown (165°C), input UVLO tied to VCC regulation, and precision enable with 100 mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8 V to 36 V - supports wide automotive battery transients including cold-crank (≥4.5 V) and load-dump (≤36 V). |
| Output Current | 3 A continuous - sustains full-rated load at 125°C ambient with proper PCB thermal design. |
| Switching Frequency | 1.4 MHz (nominal) - enables compact external magnetics and avoids AM radio band; fixed-frequency PWM operation at medium/heavy loads. |
| RDS(on) HS/LS | 75 mΩ / 50 mΩ - minimizes conduction loss; enables >95% peak efficiency at 12 VIN/3.3 VOUT/3 A. |
| Quiescent Current | 25 µA operating / 5 µA shutdown - extends battery life in always-on automotive modules. |
| Enable Threshold | VEN-H = 1.231 V (typ), hysteresis = 100 mV - allows precise input UVLO setting via external resistor divider. |
| Power-Good Timing | tPG = 60–170 µs glitch filter - prevents false resets during fast line/load transients while ensuring reliable fault detection. |
Pinout & Package
The LMR33630BQRNXTQ1 is housed in a 12-pin VQFN (RNX) package measuring 3.00 mm × 2.00 mm × 0.85 mm with wettable flanks for automated optical inspection. Thermal performance is characterized by RθJA = 72.5°C/W (JEDEC 4-layer board) and RθJB = 23.3°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 | PGND | Power ground return path for high-current switch node; must be connected directly to AGND and input/output capacitors with low-inductance traces. |
| 2, 10 | VIN | Main input supply rail; requires local 10–22 µF ceramic capacitor placed adjacent to pins 2 and 10 with minimal loop area. |
| 3 | NC | No internal connection; used on PCB to route SW node to CBOOT capacitor - simplifies layout and reduces parasitic inductance. |
| 4 | BOOT | Bootstrap supply for high-side driver; requires 100 nF X7R ceramic capacitor connected directly to SW pin. |
| 5 | VCC | Internal 5-V LDO output; powers control circuitry and can source PG flag logic; bypass with 1 µF capacitor to AGND. |
| 6 | AGND | Analog ground reference for feedback, enable, and power-good circuits; must be star-connected to PGND at single point. |
| 7 | FB | Resistive divider feedback input; senses output voltage; requires direct connection to resistor divider tap without stubs or vias. |
| 8 | PG | Open-drain power-good flag; pulls low during startup, fault, or EN deactivation; requires external pull-up to VCC or VOUT. |
| 9 | EN | Active-high enable with precision thresholds; connects directly to VIN if UVLO not required; must never float. |
| 12 | SW | Switch node connecting internal MOSFETs to external inductor; routed to NC pin on PCB to minimize CBOOT loop inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C TA) - validated for under-hood and dashboard environments without derating. |
| Integrated MOSFETs | 75 mΩ HS / 50 mΩ LS RDS(on) - eliminates external FETs and gate drivers, reducing BOM count and layout complexity. |
| EMI-optimized layout | Symmetrical VIN/PGND pin arrangement + HotRod™ package - reduces common-mode noise and eases CISPR 25 Class 5 compliance. |
| Light-load efficiency | PFM mode with diode emulation - maintains >85% efficiency at 1 mA load, critical for always-on telematics modules. |
| Protection suite | Hiccup-mode short-circuit, thermal shutdown (165°C), cycle-by-cycle current limit, and input UVLO - enables robust field operation without external supervision. |
Applications
| Infotainment USB Charging | Telematics Control Unit (TCU) |
|---|---|
Use Scenario: Powering dual-port 5 V/2.4 A USB Type-A outputs in automotive head units using a single 12 V battery input. IC Role / Device Role / Timing Role: Primary 3.3 V/5 V buck regulator supplying USB controller, PHY, and port power switches; provides power-good sequencing signal to MCU. Use Value: 1.4 MHz switching enables use of 1.0 µH inductors and 22 µF ceramic output caps, reducing solution size by >35% vs. 400 kHz alternatives. | Use Scenario: Generating stable 3.3 V supply for LTE modem, GNSS receiver, and CAN transceiver in cellular-connected vehicle tracking systems. IC Role / Device Role / Timing Role: System power rail regulator with precision enable for controlled wake-up from sleep mode and PG flag for safe firmware initialization. Use Value: 25 µA quiescent current and 5 µA shutdown current meet ISO 16750-2 "parking mode" requirements (<100 µA total system draw). |
| ADAS Camera Module | Body Control Module (BCM) |
Use Scenario: Providing regulated 1.8 V and 2.8 V supplies to image sensor and ISP in rear-view or surround-view camera ECUs. IC Role / Device Role / Timing Role: Secondary buck stage following a pre-regulator; uses FB divider to set multiple output voltages; PG flag validates rail stability before sensor initialization. Use Value: 68 ns minimum on-time supports 12 V → 1.8 V conversion at 1.4 MHz, eliminating need for cascaded regulators. | Use Scenario: Supplying 5 V to microcontroller, LIN transceivers, and LED drivers in centralized door module or lighting control unit. IC Role / Device Role / Timing Role: Main system power IC with EN pin tied to ignition-switched 12 V; PG flag triggers MCU reset and diagnostic self-test on power-up. Use Value: Integrated compensation and 1.4 MHz frequency simplify layout and eliminate stability tuning, accelerating time-to-sample by ~2 weeks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR33630AQRNXTQ1 | 400 kHz switching frequency; higher minimum on-time (120 ns); lower light-load efficiency due to fixed-frequency PFM suppression. | Better suited for cost-sensitive, non-EMI-critical applications where larger inductors/caps are acceptable. | Select when EMI filtering is less constrained and thermal budget allows larger magnetics. |
| LMR33630CQRNXTQ1 | 2.1 MHz switching frequency; tighter RDS(on) tolerance (75/50 mΩ typ only); reduced tON-MIN (60 ns) for ultra-low VOUT designs. | Optimized for space-constrained ADAS sensors requiring <1.0 V outputs or multi-phase synchronization. | Select when board area is premium and 2.1 MHz enables sub-1 µH inductors with <100 mV ripple. |
Compared with LMR33630AQRNXTQ1 and LMR33630CQRNXTQ1, the LMR33630BQRNXTQ1 offers balanced EMI performance, thermal efficiency, and component size - making it the default choice for mid-tier automotive infotainment and telematics where 1.4 MHz delivers optimal trade-off between filter size, switching loss, and PCB real estate.
Availability
LMR33630BQRNXTQ1 is available at Aetrix Electronics and suitable for automotive infotainment systems, telematics control units, and ADAS camera modules requiring stable component supply, AEC-Q100 compliance, and functional safety documentation support.
Supply support for LMR33630BQRNXTQ1 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 over 40 years of automotive qualification experience.
The LMR33630BQRNXTQ1 belongs to TI's automotive-qualified SIMPLE SWITCHER® DC/DC regulator family, designed specifically for rugged, high-reliability vehicle subsystems requiring low EMI, extended temperature operation, and functional safety readiness.
FAQ
What is the switching frequency of the LMR33630BQRNXTQ1?
The LMR33630BQRNXTQ1 operates at a fixed nominal switching frequency of 1.4 MHz. This value is factory-configured and cannot be adjusted externally. The actual frequency varies within ±14% (1.2 MHz to 1.6 MHz) over temperature and input voltage per datasheet Section 6.5. It enables compact filter design while avoiding AM radio interference bands.
Does the LMR33630BQRNXTQ1 require external compensation components?
No, the LMR33630BQRNXTQ1 integrates a complete compensation network internally. No external Type II or Type III compensation components are needed - only the standard input/output capacitors, inductor, and FB divider resistors are required for basic operation. This reduces design risk and accelerates layout validation.
How does the power-good (PG) flag behave during startup of the LMR33630BQRNXTQ1?
During startup, the LMR33630BQRNXTQ1 asserts the open-drain PG flag high approximately 4 ms after EN is pulled high, following completion of the internal 2.9–6 ms soft-start ramp. The flag remains high only when output voltage is within ±5% of target (per VPG-HIGH-DN/VPG-LOW-UP). It pulls low during faults, EN deactivation, or undervoltage conditions.
Can the LMR33630BQRNXTQ1 operate with a 3.8 V input and 3.3 V output?
Yes, the LMR33630BQRNXTQ1 supports this condition reliably. Its 68 ns minimum on-time and peak-current-mode architecture allow stable regulation at VIN/VOUT ratios up to ~1.15×. At 3.8 VIN/3.3 VOUT, the device operates in PFM mode with >88% efficiency at 100 mA load, confirmed in datasheet Figure 6-10.
What protection features are built into the LMR33630BQRNXTQ1?
The LMR33630BQRNXTQ1 includes cycle-by-cycle overcurrent protection, hiccup-mode short-circuit response (94 ms off-time), thermal shutdown (165°C trip, 148°C recovery), input undervoltage lockout (tied to VCC regulation), and precision enable with hysteresis. All protections are fully integrated - no external components are required to activate them.
LMR33630BQRNXTQ1 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:
- 1.4MHz
- 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)
LMR33630BQRNXTQ1 FAQ
1.How can I place an order for LMR33630BQRNXTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33630BQRNXTQ1 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 LMR33630BQRNXTQ1 reliable?
The price and inventory of LMR33630BQRNXTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33630BQRNXTQ1 is usually 5 days.
3.What payment methods are accepted for LMR33630BQRNXTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33630BQRNXTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33630BQRNXTQ1?
LMR33630BQRNXTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33630BQRNXTQ1 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 LMR33630BQRNXTQ1?
For technical support, including LMR33630BQRNXTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33630BQRNXTQ1 requirements.
6.How does Aetrix verify that LMR33630BQRNXTQ1 is sourced from the original manufacturer or authorized distributors?
All LMR33630BQRNXTQ1 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 LMR33630BQRNXTQ1 meets industry standards.
7.What is the process for return or replacement of LMR33630BQRNXTQ1?
All LMR33630BQRNXTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR33630BQRNXTQ1, 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 LMR33630BQRNXTQ1 part is unused and in its original packaging.
Return procedure for LMR33630BQRNXTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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