My Inquiry
My Account
Texas Instruments LMR33620BQRNXTQ1
- Part No.:
- LMR33620BQRNXTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR33620BQRNXTQ1.pdf
- Description:
- IC REG BUCK ADJ 2A 12VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:618
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LMR33620BQRNXTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified synchronous step-down DC/DC converter delivering up to 2 A output current across 3.8 V–36 V input range, with 1.4 MHz fixed switching frequency, integrated 75-mΩ/50-mΩ MOSFETs, and precision enable for infotainment power rails.
For engineers reviewing the LMR33620BQRNXTQ1 datasheet, LMR33620BQRNXTQ1 pinout, LMR33620BQRNXTQ1 application, or LMR33620BQRNXTQ1 equivalent, this page delivers verified functional safety–capable buck regulator specifications, thermal performance data, EMI-optimized HotRod™ VQFN package layout guidance, and validated automotive-grade reliability metrics.
Technical Context
The LMR33620BQRNXTQ1 implements peak-current-mode control with automatic PFM/PWM mode transition, enabling high efficiency (>95% peak) across full load range while maintaining stable regulation down to 1 V output. Its 68 ns minimum on-time supports high VIN-to-VOUT ratios (e.g., 20 V → 3.3 V at 2.1 MHz).
It integrates internal compensation, a precision 1.0 V feedback reference (±1.5% over temperature), open-drain power-good flag with glitch filtering (60–170 µs), and robust protection including cycle-by-cycle current limit, hiccup-mode short-circuit response (94 ms off-time), thermal shutdown (165°C), and input UVLO.
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 - Sustains full rated load at 125°C ambient with proper PCB thermal design |
| Switching Frequency | 1.4 MHz - Enables compact external components (e.g., ≤2.2 µH inductor, 22 µF output cap) and avoids AM band EMI |
| Efficiency (Peak) | >95% - Achieved at mid-load (e.g., 12 VIN → 3.3 VOUT, 1 A) with minimal conduction and switching losses |
| Quiescent Current | 25 µA typical - Enables always-on systems (e.g., telematics wake-up logic) without excessive battery drain |
| Feedback Reference | 1.000 V ±1.5% - Ensures tight output voltage accuracy (±1.5% regulation) across –40°C to +125°C |
| Thermal Shutdown | 165°C activation / 148°C recovery - Provides safe thermal cycling under sustained overload or poor heatsinking |
Pinout & Package
LMR33620BQRNXTQ1 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 HotRod™ layout minimizes parasitic inductance via symmetrical VIN/PGND pin placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 | PGND | Power ground return path for high-current switching node; must connect directly to low-impedance PCB ground plane |
| 2, 10 | VIN | Main input supply rail; requires local 10-µF ceramic bypass capacitor placed adjacent to pins 2 and 10 |
| 3 | NC | No internal connection; on PCB, tie to SW net to simplify CBOOT routing per TI layout guidelines |
| 4 | BOOT | Bootstrap supply for high-side driver; connects via 100-nF capacitor to SW pin |
| 5 | VCC | Internal 5-V LDO output; powers control circuitry; decouple with 1-µF capacitor to AGND |
| 6 | AGND | Analog ground reference for FB, EN, PG; separate from PGND but tied at single point near IC |
| 7 | FB | Feedback input referenced to 1.000 V; connects to resistor divider tap; never float or ground |
| 8 | PG | Open-drain power-good flag; pulls low during fault or startup; requires external pullup (e.g., to VCC) |
| 9 | EN | Enable input with precision thresholds (1.231 V turn-on, 0.3 V turn-off); direct VIN connection allowed |
| 12 | SW | Switch node connecting to power inductor; high dv/dt node requiring minimized trace area and length |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation in automotive powertrain and body electronics |
| Functional Safety-Capable documentation | TI provides FIT rate, failure mode analysis, and diagnostic coverage reports for ISO 26262 ASIL-B integration |
| Integrated MOSFETs (75 mΩ HS / 50 mΩ LS) | Eliminates external power stage, reduces BOM count, and improves thermal coupling vs discrete solutions |
| HotRod™ VQFN with wettable flanks | Enables AOI-compatible solder joint inspection and achieves 23.3°C/W junction-to-board thermal resistance |
| Automatic PFM/PWM light-load mode | Maintains >85% efficiency at 1 mA load by reducing switching frequency and enabling diode emulation |
| Integrated compensation network | Removes need for external Type-II/III compensation components, accelerating design-in and reducing layout sensitivity |
Applications
| Infotainment USB Charging | Telematics Control Unit |
|---|---|
Use Scenario: Powering dual-port USB 2.0 hub in center console with 5 V/2 A output requirement under varying vehicle battery conditions (6–16 V). IC Role / Device Role / Timing Role: Primary buck regulator providing regulated 5 V rail; handles cold-crank dips and load-dump surges without dropout or reset. Use Value: Delivers stable 5 V at 2 A with <1.5% regulation error across temperature and line, eliminating need for post-regulator LDOs. | Use Scenario: Supplying 3.3 V core voltage to LTE modem and GNSS receiver in connected car gateway module. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter stepping down 12 V vehicle supply to clean 3.3 V logic rail. Use Value: Achieves >92% efficiency at 500 mA load and 25 µA quiescent current, extending battery backup runtime during ignition-off states. |
| ADAS Camera Module | Automotive Instrument Cluster |
Use Scenario: Generating 1.8 V and 3.3 V rails for image sensor and ISP in rear-view camera using dual-output design with feedback divider networks. IC Role / Device Role / Timing Role: Single-channel adjustable buck supplying precise, low-noise analog and digital supplies with power-good sequencing. Use Value: 68 ns minimum on-time enables direct 12 V → 1.8 V conversion at 1.4 MHz, minimizing solution size versus two-stage designs. | Use Scenario: Powering TFT-LCD display controller and microcontroller in digital instrument cluster with strict EMI limits. IC Role / Device Role / Timing Role: EMI-optimized buck regulator using HotRod™ layout and parallel VIN/PGND paths to meet CISPR-25 Class 5 radiated emissions. Use Value: Reduces switch-node ringing amplitude by >50% vs standard QFN, lowering conducted EMI filter component count by 30%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR33620AQRNXTQ1 | 400 kHz switching frequency; higher minimum on-time (100 ns); lower light-load efficiency due to fixed-frequency PFM | Better suited for cost-sensitive, non-EMI-critical applications where larger inductors/caps are acceptable | Select when board space is not constrained and AM-band EMI is not a concern |
| LMR33620CQRNXTQ1 | 2.1 MHz switching frequency; tighter RDS(on) tolerance (75/50 mΩ typ); shorter min on-time (60 ns) | Optimized for ultra-compact designs requiring sub-1 µH inductors and fast transient response | Select when footprint is critical and input-to-output ratio exceeds 5:1 |
Compared with LMR33620AQRNXTQ1 and LMR33620CQRNXTQ1, the LMR33620BQRNXTQ1 offers balanced performance: 1.4 MHz enables moderate-size magnetics while avoiding AM band interference, and its 68 ns on-time supports common automotive 12 V → 3.3 V/5 V conversions without compromising efficiency or stability.
Availability
LMR33620BQRNXTQ1 is available at Aetrix Electronics and suitable for automotive infotainment, telematics, and ADAS applications requiring stable component supply, AEC-Q100 compliance, and functional safety documentation support.
Supply support for LMR33620BQRNXTQ1 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 automotive qualification expertise and broad power management portfolio.
The LMR33620-Q1 product line delivers high-efficiency, small-solution-size synchronous buck regulators engineered specifically for automotive subsystems demanding AEC-Q100 Grade 1 reliability, EMI robustness, and functional safety readiness.
FAQ
What is the switching frequency of the LMR33620BQRNXTQ1?
The LMR33620BQRNXTQ1 operates at a fixed 1.4 MHz switching frequency. This value is factory-programmed and cannot be adjusted externally. It enables compact external component selection-such as 2.2 µH inductors and 22 µF ceramic output capacitors-while avoiding the AM radio band (530–1710 kHz). The 1.4 MHz frequency is confirmed in TI's device comparison table and electrical characteristics section (ƒSW = 1.2–1.6 MHz, typical 1.4 MHz).
Does the LMR33620BQRNXTQ1 require external compensation components?
No, the LMR33620BQRNXTQ1 integrates a complete Type-II compensation network internally. This eliminates the need for external resistors and capacitors on the COMP pin, simplifying design, reducing BOM count, and improving noise immunity. The integrated compensation is optimized for stability with standard output capacitor ESR ranges and is validated across all operating conditions in TI's characterization data.
What is the purpose of the NC pin (Pin 3) on the LMR33620BQRNXTQ1?
Pin 3 on the LMR33620BQRNXTQ1 is a no-connect (NC) terminal with no internal silicon connection. Per TI's pin function table and layout guidelines, it must be connected to the SW net on the PCB to simplify routing of the CBOOT capacitor between BOOT and SW. This mechanical routing aid reduces trace inductance and improves bootstrap capacitor effectiveness-critical for reliable high-side FET gate drive.
How does the LMR33620BQRNXTQ1 handle short-circuit conditions?
The LMR33620BQRNXTQ1 employs dual-level protection: cycle-by-cycle peak current limiting for momentary overloads, and hiccup-mode shutdown for sustained shorts. When FB voltage drops below ~0.4 V, the device halts switching for 94 ms (tHC), then attempts soft-start recovery. If the fault persists, it repeats the cycle-limiting average power dissipation and junction temperature rise to prevent damage during hard shorts.
Is the LMR33620BQRNXTQ1 pin-compatible with other variants in the LMR33620-Q1 family?
Yes, all LMR33620-Q1 variants-including LMR33620AQRNXTQ1, LMR33620BQRNXTQ1, and LMR33620CQRNXTQ1-share identical 12-pin VQFN (RNX) packaging, pinout, and footprint. They differ only in factory-set switching frequency and minor RDS(on) tolerances. This allows drop-in replacement during design iteration or EOL mitigation without PCB revision.
LMR33620BQRNXTQ1 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:
- 1.4MHz
- 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)
LMR33620BQRNXTQ1 FAQ
1.How can I place an order for LMR33620BQRNXTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33620BQRNXTQ1 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 LMR33620BQRNXTQ1 reliable?
The price and inventory of LMR33620BQRNXTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33620BQRNXTQ1 is usually 5 days.
3.What payment methods are accepted for LMR33620BQRNXTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33620BQRNXTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33620BQRNXTQ1?
LMR33620BQRNXTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33620BQRNXTQ1 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 LMR33620BQRNXTQ1?
For technical support, including LMR33620BQRNXTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33620BQRNXTQ1 requirements.
6.How does Aetrix verify that LMR33620BQRNXTQ1 is sourced from the original manufacturer or authorized distributors?
All LMR33620BQRNXTQ1 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 LMR33620BQRNXTQ1 meets industry standards.
7.What is the process for return or replacement of LMR33620BQRNXTQ1?
All LMR33620BQRNXTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR33620BQRNXTQ1, 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 LMR33620BQRNXTQ1 part is unused and in its original packaging.
Return procedure for LMR33620BQRNXTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMR33620BQRNXTQ1 Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
