My Inquiry
My Account
Texas Instruments LMS3635NQRNLRQ1
- Part No.:
- LMS3635NQRNLRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LMS3635NQRNLRQ1.pdf
- Description:
- IC REG BUCK 3.3V 3.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,401
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LMS3635NQRNLRQ1 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, ±1.5% reference voltage tolerance, and integrated spread-spectrum EMI reduction. It operates across 3.9–36 V input, supports external synchronization, and features a built-in open-drain RESET output with 3-ms release timer-used in driver monitoring and surround-view ECU power rails.
For engineers reviewing the LMS3635NQRNLRQ1 datasheet, LMS3635NQRNLRQ1 pinout, LMS3635NQRNLRQ1 application, or LMS3635NQRNLRQ1 equivalent, key selection criteria include its 3.3-V fixed output, wettable-flank 22-pin VQFN (4.0 mm × 5.0 mm) package, 18-µA quiescent current at 3.3 VOUT, 0.35-V dropout at 3.5 A, and AEC-Q100 qualification for under-hood automotive use.
Technical Context
The LMS3635NQRNLRQ1 implements peak-current-mode control with internal compensation, enabling stable regulation without external loop components. Its flip-chip VQFN construction minimizes parasitic inductance, reducing switch-node ringing and conducted EMI-critical for automotive USB charge and LIDAR systems where noise immunity is mandatory.
It integrates dual MOSFETs (HS RDSON ≤ 130 mΩ, LS RDSON ≤ 80 mΩ), automatic light-load PFM/PWM transition, pin-selectable forced PWM mode via FPWM, and thermal shutdown at 160–185°C. The BIAS pin enables efficient operation down to 3.5 V input while maintaining 3.3 V output regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±2% to ±3% over load/temperature; eliminates external feedback divider |
| Max Output Current | 3.5 A continuous; supports high-current automotive subsystems like camera ECUs |
| Input Voltage Range | 3.9 V to 36 V; withstands 42-V transients ≤500 ms-reduces need for upstream surge protection |
| Switching Frequency | 400 kHz ±10%; enables compact 2.2-µH inductors and low-profile ceramic capacitors |
| Quiescent Current | 18 µA at VIN=13.5 V, VOUT=3.3 V, no load; extends battery runtime in always-on modules |
| Dropout Voltage | 0.35 V typical at 3.5 A, 25°C; maintains regulation during cold-crank (≥6 V input) |
| RESET Output | Open-drain with 3-ms release timer and internal glitch filter; replaces discrete supervisor IC |
| EMI Reduction | Integrated spread spectrum (±3% frequency dither); lowers peak conducted emissions by >10 dBµV |
Pinout & Package
Package: 22-pin VQFN (RNL), 4.00 mm × 5.00 mm, wettable flanks-enables automated optical solder-joint inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VCC | Internal 3.1-V LDO output | Power source for internal control logic; requires 4.7-µF bypass capacitor to AGND |
| 2 CBOOT | Bootstrap capacitor node | Drives high-side gate; connects to SW via 470-nF ceramic capacitor |
| 3 SYNC | External clock input | Accepts 250–500 kHz system clock; synchronizes switching to reduce beat frequencies |
| 4,14 PVIN1/PVIN2 | Main power inputs | Parallel-connected VIN pins minimize IR drop and thermal resistance in high-current paths |
| 5,10 PGND1/PGND2 | Power ground returns | Low-inductance paths for high-side/low-side MOSFETs; must be tied directly on PCB |
| 9 SW | Switch node | Connects to inductor; layout critical for EMI-short, wide trace recommended |
| 15 AVIN | Analog supply input | Bias source for error amplifier; ties to PVIN for noise isolation |
| 16 FPWM | Mode control input | High = forced PWM (no frequency variation); low = automatic light-load PFM mode |
| 18 EN | Enable input | Active-high logic; 1.7–2.0 V threshold with 0.5 V hysteresis ensures noise immunity |
| 19 RESET | Open-drain fault flag | Asserts low on UVLO, thermal shutdown, or EN deactivation; 50–120 Ω pull-down RDS(on) |
| 20 AGND | Analog ground reference | Reference for FB, VREF, and internal circuits; isolated from PGND except at single-point tie |
| 21 FB | Feedback input | Monitors regulated 3.3 V output directly-no resistor network required for fixed version |
| 22 BIAS | Auxiliary bias regulator input | Connected to VOUT to improve efficiency below 6 V input; enables 3.5-V minimum start-up |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient; meets automotive reliability and stress-test requirements |
| Integrated spread-spectrum modulation | Reduces EMI peak amplitudes by spreading energy across ±3% of 400 kHz-simplifies EMC compliance |
| Automatic light-load PFM mode | Maintains >85% efficiency at 10 mA load; eliminates need for external enable sequencing |
| Built-in RESET with filtering | 3-ms release timer and 24-µs glitch filter provide clean, debounced system reset signal |
| Wettable-flank VQFN package | Enables AOI-based solder-joint verification-critical for zero-defect automotive manufacturing |
| Thermal shutdown with hysteresis | Triggers at 160–185°C junction temperature; 15°C hysteresis prevents oscillation near limit |
Applications
| Automotive USB Charging | Driver Monitoring System |
|---|---|
Use Scenario: Powering dual-lens infrared cameras and SoC in cabin-facing driver attention modules. IC Role / Device Role / Timing Role: Primary 3.3-V rail regulator for image sensor interface and microcontroller I/O. Use Value: 18-µA IQ enables <24-hour battery-off monitoring; 36-V input tolerance survives jump-start surges. |
Use Scenario: Supplying vision processor and eye-tracking ASIC in ADAS head unit. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with precise 3.3-V output for low-noise analog front-end. Use Value: Spread-spectrum operation reduces EMI coupling into sensitive video ADC lines. |
| Surround-View ECU | Mechanically Scanning LIDAR |
Use Scenario: Powering four 3.3-V image processors in 360° camera fusion controller. IC Role / Device Role / Timing Role: Compact, thermally robust DC/DC stage replacing discrete buck + LDO solution. Use Value: 0.35-V dropout allows operation during engine cranking; wettable flanks ensure solder joint reliability. |
Use Scenario: Generating stable 3.3-V bias for MEMS mirror drivers and time-of-flight timing circuitry. IC Role / Device Role / Timing Role: Low-noise, low-jitter power source for precision timing and analog signal chains. Use Value: Flip-chip construction suppresses switch-node ringing-preserves signal integrity in ns-level timing windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMS36353QRNLRQ1 | Same 3.3-V fixed output, same 22-pin VQFN, but no spread-spectrum modulation | Lacks EMI reduction-requires additional filtering in noise-sensitive radar/LIDAR designs | Select when cost sensitivity outweighs EMI performance needs and board space permits external filters |
| LM61480QRNLRQ1 | Higher 8-A rating, 2.1-MHz switching, no AEC-Q100 Grade 1 rating; different pinout | Not qualified for automotive ambient temperature range; unsuitable for under-hood deployment | Choose only for industrial or infotainment applications where 125°C ambient is sufficient |
Compared with LMS36353QRNLRQ1 and LM61480QRNLRQ1, the LMS3635NQRNLRQ1 uniquely combines AEC-Q100 Grade 1 qualification, integrated spread-spectrum EMI reduction, and wettable-flank packaging-making it the only option qualified for safety-critical automotive vision systems requiring zero-defect solder joints and low radiated emissions.
Availability
LMS3635NQRNLRQ1 is available at Aetrix Electronics and suitable for automotive USB charging, driver monitoring systems, surround-view ECUs, and mechanically scanning LIDAR requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LMS3635NQRNLRQ1 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 and embedded processing technologies, with decades of automotive-grade power management innovation.
The LMS3635NQRNLRQ1 belongs to TI's LMS36x5-Q1 family-designed specifically for high-reliability automotive power conversion where low EMI, wide input range, and AEC-Q100 compliance are mandatory.
FAQ
What is the minimum input voltage required for LMS3635NQRNLRQ1 to regulate 3.3 V at full 3.5-A load?
The LMS3635NQRNLRQ1 requires a minimum input voltage of 3.5 V after start-up to maintain 3.3-V output regulation at 3.5 A load, per Section 7.7 of the datasheet. This extended low-input capability is enabled by the BIAS pin connection to VOUT, allowing operation during automotive cold-crank conditions where battery voltage dips to ~6 V.
Does LMS3635NQRNLRQ1 require external compensation components?
No, the LMS3635NQRNLRQ1 features built-in compensation circuitry. Its peak-current-mode architecture with internal error amplifier and PWM comparator eliminates the need for external compensation networks-reducing BOM count and layout complexity while ensuring stability across all operating conditions.
How does the spread-spectrum function operate in LMS3635NQRNLRQ1?
The LMS3635NQRNLRQ1 implements spread-spectrum modulation by dithering the 400-kHz switching frequency ±3% at 1.2 Hz. This spreads electromagnetic energy across a wider bandwidth, lowering peak conducted and radiated emissions-verified in Figure 7-12 of the SNAS714C datasheet-without affecting output regulation or transient response.
Can LMS3635NQRNLRQ1 be synchronized to an external clock?
Yes, the LMS3635NQRNLRQ1 accepts an external clock on the SYNC pin (Pin 3) within 250–500 kHz. The device triggers on rising edges and maintains tight frequency alignment-enabling synchronization with system clocks to avoid beat frequencies in multi-rail automotive domains such as ADAS domain controllers.
What is the purpose of the BIAS pin on LMS3635NQRNLRQ1?
The BIAS pin (Pin 22) supplies the auxiliary bias regulator that powers internal circuitry. When connected to the 3.3-V output, it enables the LMS3635NQRNLRQ1 to start and regulate from as low as 3.5 V input-critical for automotive cold-crank operation. Without BIAS connection, minimum input rises to 3.9 V.
LMS3635NQRNLRQ1 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)
LMS3635NQRNLRQ1 FAQ
1.How can I place an order for LMS3635NQRNLRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMS3635NQRNLRQ1 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 LMS3635NQRNLRQ1 reliable?
The price and inventory of LMS3635NQRNLRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMS3635NQRNLRQ1 is usually 5 days.
3.What payment methods are accepted for LMS3635NQRNLRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMS3635NQRNLRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMS3635NQRNLRQ1?
LMS3635NQRNLRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMS3635NQRNLRQ1 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 LMS3635NQRNLRQ1?
For technical support, including LMS3635NQRNLRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMS3635NQRNLRQ1 requirements.
6.How does Aetrix verify that LMS3635NQRNLRQ1 is sourced from the original manufacturer or authorized distributors?
All LMS3635NQRNLRQ1 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 LMS3635NQRNLRQ1 meets industry standards.
7.What is the process for return or replacement of LMS3635NQRNLRQ1?
All LMS3635NQRNLRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMS3635NQRNLRQ1, 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 LMS3635NQRNLRQ1 part is unused and in its original packaging.
Return procedure for LMS3635NQRNLRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMS3635NQRNLRQ1 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…
