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Texas Instruments LMR33620APAQRNXRQ1
- Part No.:
- LMR33620APAQRNXRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR33620APAQRNXRQ1.pdf
- Description:
- IC REG BUCK ADJ 2A 12VQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LMR33620APAQRNXRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified synchronous step-down DC/DC converter delivering up to 2 A output current from 3.8 V–36 V input, with adjustable 1 V–24 V output voltage, 400 kHz switching frequency, and 75 mΩ/50 mΩ integrated high-side/low-side MOSFETs - deployed in infotainment power rails requiring high efficiency and low EMI.
For engineers reviewing the LMR33620APAQRNXRQ1 datasheet, LMR33620APAQRNXRQ1 pinout, LMR33620APAQRNXRQ1 application, or LMR33620APAQRNXRQ1 equivalent, key selection considerations include its 68 ns minimum on-time, 25 µA operating quiescent current, power-good flag with glitch filtering, thermal shutdown at 165°C, and VQFN-12 (3 mm × 2 mm) wettable-flank package optimized for automotive PCB layout and EMI control.
Technical Context
This device implements peak-current-mode control with automatic PFM/PWM mode transition to maintain high efficiency across load range. It integrates internal compensation, a precision enable input with 1.231 V typical turn-on threshold, and a 1 V feedback reference with ±1.5% regulation accuracy over temperature and line/load conditions.
The architecture supports rugged automotive operation via cycle-by-cycle current limiting, hiccup-mode short-circuit protection, input UVLO tied to internal VCC LDO, and thermal shutdown with 148°C recovery hysteresis. Its HotRod™ VQFN package enables parallel input current paths and minimizes parasitic inductance for reduced switch-node ringing.
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 | 2 A continuous - sufficient for powering dual-core MCU cores, CAN transceivers, and display controllers in cluster applications. |
| Switching Frequency | 400 kHz - balances efficiency, inductor size, and EMI performance; avoids AM radio band while enabling compact magnetics. |
| Quiescent Current | 25 µA - enables >10-year battery standby life in always-on telematics modules without compromising wake-up responsiveness. |
| Feedback Reference | 1.000 V ±1.5% - ensures precise output regulation across –40°C to +125°C ambient, critical for sensor biasing and ADC reference stability. |
| Min On-Time | 68 ns - allows high step-down ratio (e.g., 24 V → 1.2 V) at 400 kHz without pulse-skipping artifacts or instability. |
| Power-Good Flag | Open-drain PG with 105%/95% thresholds and 170 µs glitch filter - provides reliable system reset signaling during brown-out or overvoltage events. |
Pinout & Package
The LMR33620APAQRNXRQ1 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 and robust solder joint reliability in automotive environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 PGND | Power ground | Primary return path for high-current switch node; must be connected to AGND and bypass capacitor with short, wide traces to minimize noise coupling. |
| 2, 10 VIN | Input supply | High-current input rail connection; requires direct placement of ≥10 µF ceramic capacitor to PGND for transient suppression. |
| 3 NC | No connect | Internally unconnected; used on PCB to simplify CBOOT-to-SW routing - must be tied to SW on board per TI layout guidance. |
| 4 BOOT | Bootstrap supply | Provides gate drive voltage for high-side MOSFET; requires 100 nF X7R capacitor directly between BOOT and SW pins. |
| 5 VCC | Internal LDO output | 5 V ±2.5% regulated supply for internal logic; not for external loading - decoupled with 1 µF capacitor to AGND. |
| 6 AGND | Analog ground | Reference for FB, EN, PG, and internal references; isolated from PGND at single-point connection to avoid ground bounce. |
| 7 FB | Feedback input | Monitors output via resistor divider; 1 V reference enables accurate adjustable outputs; floating or grounding causes regulation failure. |
| 8 PG | Power-good flag | Open-drain status signal; requires external pull-up (e.g., to VOUT or VCC); asserts low during startup, fault, or EN deactivation. |
| 9 EN | Enable input | Logic-controlled startup; 1.231 V typical threshold enables precise UVLO implementation using external resistive divider. |
| 12 SW | Switch node | Connection point for power inductor; high dv/dt node requiring minimized trace area and guard ring to reduce EMI radiation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation - meets automotive electronics reliability requirements for under-hood and dashboard mounting. |
| Integrated high- and low-side MOSFETs | 75 mΩ HS / 50 mΩ LS RDS(on) - eliminates external FETs and drivers, reducing BOM count and layout complexity while maintaining >95% peak efficiency. |
| HotRod™ VQFN with wettable flanks | Low-inductance, symmetrical VIN/PGND pin layout - reduces EMI by enabling magnetic field cancellation and simplifies automated optical inspection (AOI) in high-volume production. |
| Auto PFM/PWM mode transition | Seamless light-load efficiency boost - maintains >85% efficiency at 1 mA load without external control, extending battery life in always-on subsystems. |
| Integrated soft-start and compensation | 4 ms internal soft-start time and fully compensated loop - prevents output overshoot and eliminates need for external compensation components or tuning. |
Applications
| Infotainment Power Rail | Cluster Display Supply |
|---|---|
Use Scenario: Powers SoC core, GPU, and DDR memory in head-unit systems with dynamic load profiles from idle to video decode. IC Role / Device Role / Timing Role: Primary 1.2 V/2 A buck regulator delivering stable, low-noise power synchronized to system enable sequencing. Use Value: 68 ns min on-time enables clean 12 V→1.2 V conversion at 400 kHz; 25 µA IQ extends runtime during vehicle sleep mode. | Use Scenario: Supplies 3.3 V/1.5 A to TFT-LCD timing controller and backlight driver in digital instrument clusters. IC Role / Device Role / Timing Role: Adjustable-output buck converter with PG flag ensuring safe microcontroller boot after stable 3.3 V establishment. Use Value: 105%/95% PG thresholds and 170 µs glitch filter prevent false resets during load transients; wettable-flank package ensures solder joint integrity over thermal cycling. |
| Telematics Control Unit | ADAS Camera Interface |
Use Scenario: Provides 5 V/2 A to cellular modem, GNSS receiver, and CAN FD transceiver in connected vehicle gateways. IC Role / Device Role / Timing Role: Input-transient-tolerant buck regulator supporting cold-crank (4.5 V) and load-dump (36 V) events without dropout or latch-off. Use Value: 3.8 V–36 V input range and hiccup-mode short-circuit protection ensure uninterrupted operation during battery voltage disturbances. | Use Scenario: Generates 1.8 V/1.2 A for image signal processor (ISP) and MIPI CSI-2 serializer in rear-view camera modules. IC Role / Device Role / Timing Role: High-PSRR, low-EMI buck converter placed near ISP to minimize noise coupling into analog pixel data paths. Use Value: HotRod™ package and parallel VIN/PGND paths reduce conducted EMI by >10 dB compared to standard QFN, meeting CISPR-25 Class 5 limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR33630APAQRNXRQ1 | 3 A rated output current; identical package, pinout, and feature set - differs only in current capability and internal current limit thresholds. | Suitable where future-proofing for higher load or margin against aging derating is required; same PCB layout and bill-of-materials except inductor and output capacitor sizing. | Select when system peak load exceeds 2 A or when design margin requires ≥50% headroom above nominal current. |
| TPS543320RTWR | 3 A output, 2.2 MHz switching, integrated FETs, but lacks AEC-Q100 qualification and automotive temp grade; uses different pinout and compensation scheme. | Applicable in industrial or consumer designs where automotive qualification is not mandated; requires full layout redesign and new compensation network. | Choose only for non-automotive applications needing higher frequency or different feature trade-offs; not a drop-in replacement. |
Compared with LMR33630APAQRNXRQ1, the LMR33620APAQRNXRQ1 offers tighter current-limit margins and lower conduction loss at 2 A loads, while TPS543320RTWR provides higher frequency operation at the cost of automotive compliance and layout compatibility.
Availability
LMR33620APAQRNXRQ1 is available at Aetrix Electronics and suitable for infotainment power rails, digital instrument clusters, and telematics control units requiring stable component supply, long-term automotive lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LMR33620APAQRNXRQ1 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 ICs, with decades of experience in power management innovation and functional safety development.
The LMR336x0AP-Q1 product line delivers highly integrated, AEC-Q100-qualified buck converters designed specifically for automotive infotainment, cluster, and ADAS subsystems demanding high efficiency, low EMI, and robust thermal performance.
FAQ
What is the maximum input voltage rating for the LMR33620APAQRNXRQ1?
The LMR33620APAQRNXRQ1 has an absolute maximum input voltage rating of 38 V, but its recommended operating input voltage range is 3.8 V to 36 V. This range accommodates automotive battery transients including cold-crank (down to ~4.5 V) and load-dump events (up to 36 V), ensuring reliable operation in real-world vehicle electrical systems without requiring external clamping circuitry.
Does the LMR33620APAQRNXRQ1 require external compensation components?
No, the LMR33620APAQRNXRQ1 features an integrated compensation network that eliminates the need for external compensation components. This internal compensation is factory-tuned for stability across the full operating range, reducing design time and PCB area. The LMR33620APAQRNXRQ1 achieves stable regulation with only the essential external components: input/output capacitors, inductor, and feedback resistors.
How does the power-good (PG) flag behave during startup of the LMR33620APAQRNXRQ1?
During startup, the LMR33620APAQRNXRQ1 asserts the open-drain PG flag high approximately 4 ms after the EN pin is driven above its 1.231 V threshold - coinciding with completion of the internal 4 ms soft-start period. The PG remains high as long as the output voltage stays within 95%–107% of the target value and no fault (thermal shutdown, current limit, or undervoltage) is detected. If EN is pulled low, PG is forced low immediately.
What is the purpose of the NC pin on the LMR33620APAQRNXRQ1 VQFN package?
Pin 3 (NC) on the LMR33620APAQRNXRQ1 is internally unconnected but serves a critical PCB layout function: it is designated to be tied to the SW pin on the printed circuit board. This connection simplifies routing of the bootstrap capacitor (CBOOT) between BOOT and SW pins, minimizing loop area and parasitic inductance - a key requirement for stable high-frequency switching and low EMI in the LMR33620APAQRNXRQ1 design.
Can the LMR33620APAQRNXRQ1 operate efficiently at very light loads?
Yes, the LMR33620APAQRNXRQ1 automatically transitions from PWM to PFM (pulse-frequency modulation) mode at light loads, reducing switching frequency to maintain high efficiency. With only 25 µA operating quiescent current and diode-emulation behavior in discontinuous conduction mode, it achieves >85% efficiency at 1 mA output current - making it ideal for always-on automotive subsystems such as telematics wake-up receivers and CAN bus monitors.
LMR33620APAQRNXRQ1 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:
- 2A
- 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)
LMR33620APAQRNXRQ1 FAQ
1.How can I place an order for LMR33620APAQRNXRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33620APAQRNXRQ1 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 LMR33620APAQRNXRQ1 reliable?
The price and inventory of LMR33620APAQRNXRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33620APAQRNXRQ1 is usually 5 days.
3.What payment methods are accepted for LMR33620APAQRNXRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33620APAQRNXRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33620APAQRNXRQ1?
LMR33620APAQRNXRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33620APAQRNXRQ1 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 LMR33620APAQRNXRQ1?
For technical support, including LMR33620APAQRNXRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33620APAQRNXRQ1 requirements.
6.How does Aetrix verify that LMR33620APAQRNXRQ1 is sourced from the original manufacturer or authorized distributors?
All LMR33620APAQRNXRQ1 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 LMR33620APAQRNXRQ1 meets industry standards.
7.What is the process for return or replacement of LMR33620APAQRNXRQ1?
All LMR33620APAQRNXRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR33620APAQRNXRQ1, 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 LMR33620APAQRNXRQ1 part is unused and in its original packaging.
Return procedure for LMR33620APAQRNXRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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