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Texas Instruments LMS36353QRNLRQ1
- Part No.:
- LMS36353QRNLRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LMS36353QRNLRQ1.pdf
- Description:
- IC REG BUCK 3.3V 3.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LMS36353QRNLRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering 3.3 V at up to 3.5 A, with 400-kHz fixed switching frequency, 92% efficiency at 13.5 VIN/3.3 VOUT/3.5 A, and 18 µA quiescent current (IQ_VIN) at no load - optimized for USB charging and driver monitoring ECUs in 12-V/24-V vehicle architectures.
For engineers reviewing the LMS36353QRNLRQ1 datasheet, LMS36353QRNLRQ1 pinout, LMS36353QRNLRQ1 application, or LMS36353QRNLRQ1 equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade thermal and EMI performance, and real-world selection guidance against functionally aligned alternatives.
Technical Context
The LMS36353QRNLRQ1 implements peak current mode control with internal compensation, enabling stable regulation across 3.9–36 V input while maintaining ±1.5% reference voltage tolerance and seamless PWM/PFM transition. Its flip-chip VQFN package minimizes parasitic inductance, reducing switch-node ringing and conducted EMI without external filters.
It integrates a 3-ms filtered open-drain RESET output with 105–110% rising threshold and 92–96.5% falling threshold relative to VOUT, plus FPWM mode control, thermal shutdown (160–185°C), and UVLO with 0.3 V hysteresis - all qualified for –40°C to +125°C ambient operation per AEC-Q100-002 HBM ±2.5 kV and CDM ±1 kV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±3% over full load and temperature range - eliminates external feedback divider and reduces BOM count. |
| Max Output Current | 3.5 A continuous - supports high-current automotive loads like USB PD ports and camera power rails. |
| Switching Frequency | 400 kHz ±10% - enables compact 2.2-µH inductors and low-ESR ceramic output capacitors. |
| IQ_VIN | 18 µA typical at 3.3 VOUT, no load - extends battery runtime in always-on vehicle modules. |
| Input Voltage Range | 3.9 V to 36 V, with 42-V transient tolerance ≤500 ms - accommodates cold-crank, load-dump, and dual-battery systems. |
| Junction Temp Range | –40°C to +150°C - ensures reliability in under-hood ECU placements without derating. |
| Package | VQFN-22 (4.0 mm × 5.0 mm) with wettable flanks - supports automated optical solder-joint inspection. |
Pinout & Package
VQFN-22 (RNL) package, 4.0 mm × 5.0 mm body size, 0.5-mm pitch, wettable flanks, exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VCC | Internal 3.1-V LDO output | Power source for internal control circuitry; requires 4.7-µF bypass capacitor to AGND. |
| 2 CBOOT | Bootstrap capacitor node | Drives high-side MOSFET gate; connects via 470-nF capacitor to SW pin. |
| 3 SYNC | Frequency synchronization input | Accepts 250–500 kHz external clock (rising-edge triggered); enables system-level timing alignment. |
| 4,14 PVIN1/PVIN2 | Main power inputs | Parallel-connected VIN paths; require local ceramic bypass capacitors and direct tie to PGND pins. |
| 5,10 PGND1/PGND2 | Power ground return | Low-impedance path for high-side/low-side MOSFET currents; must be tied together and connected to AGND. |
| 9 SW | Switch node | Connects to power inductor; exhibits low overshoot/ringing due to flip-chip layout and minimized loop inductance. |
| 15 AVIN | Analog supply input | Bias source for error amplifier and reference; tied to PVIN on PCB. |
| 16 FPWM | Forced PWM mode control | High = fixed-frequency operation; low = automatic light-load PFM mode; must not float. |
| 18 EN | Enable input | Active-high logic; 1.7–2.0 V threshold with 0.45–0.55 V hysteresis; supports direct connection to VIN. |
| 19 RESET | Open-drain reset flag | Indicates regulation status with built-in 24-µs glitch filter and 3-ms release timer; replaces external supervisor IC. |
| 20 AGND | Analog ground reference | Reference point for FB, VREF, and internal analog circuits; must be connected to PGND on PCB. |
| 21 FB | Feedback input | Internally connected to 3.3-V reference; no external divider required for fixed-output variant. |
| 22 BIAS | Auxiliary bias input | Connected to output rail to improve light-load efficiency; supports 1–16 V range. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with HBM ±2.5 kV and CDM ±1 kV - meets automotive functional safety prerequisites. |
| Integrated RESET with filtering | Eliminates need for discrete supervisor IC by providing glitch-filtered, temperature-compensated power-good signal with 3-ms delay. |
| Flip-chip VQFN construction | Reduces switch-node parasitic inductance and magnetic field coupling - lowers radiated EMI and improves transient response. |
| Automatic light-load PFM mode | Maintains >85% efficiency down to 1 mA load - critical for always-on vehicle subsystems with variable duty cycles. |
| Built-in soft-start | 4-ms typical ramp time prevents inrush current and output overshoot during power-up - simplifies system sequencing. |
| Thermal shutdown with hysteresis | Triggers at 160–185°C junction temperature with 15°C hysteresis - protects against sustained overload or poor heatsinking. |
Applications
| Automotive USB Charging | Driver Monitoring System |
|---|---|
Use Scenario: Powering dual-port USB Type-A modules in center console or rear-seat entertainment units with 12-V battery input. IC Role / Device Role / Timing Role: Primary 3.3-V/3.5-A DC-DC regulator supplying USB controller, PHY, and level-shifters. Use Value: Delivers stable 3.3 V under cold-crank (3.9 VIN) and load-dump (42 VIN transients) while consuming only 18 µA in standby. |
Use Scenario: Supplying image signal processor (ISP), CMOS sensor interface, and eye-tracking ASIC in cabin-facing ADAS cameras. IC Role / Device Role / Timing Role: Main power rail for low-noise analog/digital domain with minimal switch-node interference. Use Value: Achieves <92% efficiency at 3.5 A and suppresses EMI via flip-chip layout - avoids corruption of high-speed video data paths. |
| Surround View ECU | Mechanically Scanning LIDAR |
Use Scenario: Powering four-channel video decoder SoCs and FPGA-based stitching engines in 360° camera fusion units. IC Role / Device Role / Timing Role: High-current 3.3-V rail supporting burst-mode processing with fast transient recovery. Use Value: Maintains regulation during 10-A peak load steps with <1% output deviation - enabled by peak current mode control and internal compensation. |
Use Scenario: Supplying laser diode driver ICs and MEMS mirror controllers requiring clean, stable 3.3 V in rotating LIDAR assemblies. IC Role / Device Role / Timing Role: Isolated, low-EMI power stage feeding precision analog front-end circuitry. Use Value: Minimizes switch-node ringing and conducted emissions - prevents false triggering in sensitive time-of-flight measurement circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QRNLRQ1 | 4.8-A output, 2.5-V to 36-V input, 2.1-MHz switching, lower IQ (12 µA), but no integrated RESET output. | Suitable for space-constrained designs needing higher current density; lacks built-in reset supervision. | Select when board area is critical and external reset IC is acceptable; avoid if supervisor integration is mandatory. |
| TPS543B20RSAR | 3.5-A, 4.5–18-V input, 500-kHz to 2.2-MHz programmable frequency, PMBus interface, no AEC-Q100 qualification. | Targeted at industrial servers and telecom; lacks automotive qualification and transient robustness. | Choose for digitally controlled systems requiring telemetry; reject for automotive deployment due to missing AEC-Q100 Grade 1. |
Compared with LM61480QRNLRQ1 and TPS543B20RSAR, the LMS36353QRNLRQ1 uniquely combines AEC-Q100 Grade 1 qualification, integrated RESET, 36-V input capability, and wettable-flank VQFN packaging - making it the only drop-in solution for cost-sensitive, safety-aware automotive power rails requiring zero external supervision components.
Availability
LMS36353QRNLRQ1 is available at Aetrix Electronics and suitable for automotive USB charging, driver monitoring systems, surround view ECUs, and mechanically scanning LIDAR applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant traceability.
Supply support for LMS36353QRNLRQ1 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 broad manufacturing scale.
The LMS3635-Q1 product line delivers high-efficiency, low-quiescent-current synchronous buck regulators specifically engineered for demanding automotive subsystems - including infotainment, ADAS, and body electronics - where reliability, thermal resilience, and EMI control are non-negotiable.
FAQ
What is the maximum continuous output current of the LMS36353QRNLRQ1?
The LMS36353QRNLRQ1 delivers up to 3.5 A continuous output current at 3.3 V under recommended operating conditions (TA ≤ 125°C, proper PCB thermal design). This rating is validated across the full –40°C to +125°C ambient range and accounts for internal MOSFET RDS(ON) and thermal limits. Derating applies above 85°C ambient without enhanced heatsinking.
Does the LMS36353QRNLRQ1 require external compensation components?
No, the LMS36353QRNLRQ1 features fully integrated compensation circuitry. Its peak current mode architecture with internal transconductance amplifier and type-II compensation network eliminates the need for external RC networks or feedforward capacitors - reducing bill-of-materials count and layout sensitivity.
How does the RESET output of the LMS36353QRNLRQ1 function in practice?
The LMS36353QRNLRQ1 RESET pin is an open-drain output that pulls low when VOUT drops below 92–96.5% of nominal (e.g., <3.04 V for 3.3 VOUT) or when EN is deasserted. It releases high after a 3-ms internal timer once regulation is restored, with 24-µs internal glitch filtering - enabling direct connection to microcontroller reset inputs without external RC networks.
Can the LMS36353QRNLRQ1 operate with input voltages below 3.9 V?
Yes - the LMS36353QRNLRQ1 supports a minimum input voltage of 3.55 V (rising) for startup and 3.25 V (falling) for hold-on, per its UVLO specification. However, full 3.5-A functionality at 3.3 VOUT requires ≥3.5 VIN; operation below this level enters dropout, where duty cycle approaches 98% and regulation accuracy degrades.
Is the LMS36353QRNLRQ1 pin-compatible with other variants in the LMS3635-Q1 family?
Yes - all LMS3635-Q1 variants, including LMS36353QRNLRQ1 (3.3 V fixed), LMS36355QRNLRQ1 (5 V fixed), and LMS3635AQRNLRQ1 (adjustable), share identical VQFN-22 (RNL) packaging, pinout, and footprint. Only FB and BIAS connections differ between fixed and adjustable versions; no PCB redesign is needed when migrating between output voltages.
LMS36353QRNLRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 22-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.9V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 3.5A
- Frequency - Switching:
- 250kHz ~ 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 22-VQFN-HR (5x4)
LMS36353QRNLRQ1 FAQ
1.How can I place an order for LMS36353QRNLRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMS36353QRNLRQ1 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 LMS36353QRNLRQ1 reliable?
The price and inventory of LMS36353QRNLRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMS36353QRNLRQ1 is usually 5 days.
3.What payment methods are accepted for LMS36353QRNLRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMS36353QRNLRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMS36353QRNLRQ1?
LMS36353QRNLRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMS36353QRNLRQ1 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 LMS36353QRNLRQ1?
For technical support, including LMS36353QRNLRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMS36353QRNLRQ1 requirements.
6.How does Aetrix verify that LMS36353QRNLRQ1 is sourced from the original manufacturer or authorized distributors?
All LMS36353QRNLRQ1 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 LMS36353QRNLRQ1 meets industry standards.
7.What is the process for return or replacement of LMS36353QRNLRQ1?
All LMS36353QRNLRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMS36353QRNLRQ1, 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 LMS36353QRNLRQ1 part is unused and in its original packaging.
Return procedure for LMS36353QRNLRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMS36353QRNLRQ1 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
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