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Texas Instruments LMS3635NQRNLTQ1
- Part No.:
- LMS3635NQRNLTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LMS3635NQRNLTQ1.pdf
- Description:
- IC REG BUCK 3.3V 3.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:250
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Product details
Overview
LMS3635NQRNLTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering 3.5-A output at fixed 3.3 V, operating from 3.9 V to 36 V input with 400-kHz fixed switching frequency and integrated compensation. It features a 0.35-V dropout at 3.5-A load, 18-µA quiescent current at 3.3-V output, and open-drain RESET with 3-ms release timer - deployed in automotive USB charge and surround-view ECU power rails.
For engineers reviewing the LMS3635NQRNLTQ1 datasheet, LMS3635NQRNLTQ1 pinout, LMS3635NQRNLTQ1 application, or LMS3635NQRNLTQ1 equivalent, key selection criteria include its 3.3-V fixed output, spread-spectrum EMI reduction, FPWM mode control, thermal shutdown at 160°C, and wettable-flank 22-pin VQFN (4.0 mm × 5.0 mm) package for automated optical inspection.
Technical Context
The LMS3635NQRNLTQ1 implements peak-current-mode control with internal compensation and automatic light-load PFM/PWM transition, enabling high efficiency across 10 µA–3.5 A loads. Its flip-chip VQFN construction minimizes switch-node ringing and radiated EMI via partial magnetic field cancellation.
It integrates a 3.1-V internal LDO (VCC), bootstrap gate drive (CBOOT), external SYNC input (250–500 kHz), and BIAS pin for auxiliary biasing - supporting operation down to 3.5 V input while maintaining regulation at full load, with transient tolerance up to 42 V for 500 ms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 3.3 V ±1.5% reference tolerance; ensures stable MCU/SoC core rail without external feedback divider |
| Max output current | 3.5 A continuous; supports multi-rail automotive ECUs without derating at 125°C ambient |
| Input voltage range | 3.9 V to 36 V, with 42-V/500-ms surge tolerance; eliminates need for upstream TVS or active clamp in 24-V systems |
| Switching frequency | 400 kHz ±10%; enables compact 2.2-µH inductors and reduces EMI filter size vs. lower-frequency converters |
| Quiescent current | 18 µA at 3.3-V output, no load; meets automotive low-power sleep-mode requirements (e.g., ISO 16750-2) |
| Dropout voltage | 0.35 V at 3.5-A load, 25°C; sustains regulation during cold-crank transients down to ~3.65 V input |
| RESET function | Open-drain output with 3-ms release timer and 92–96.5% VOUT hysteresis; replaces discrete supervisor IC in safety-critical modules |
Pinout & Package
Package: 22-pin VQFN (RNL), 4.00 mm × 5.00 mm body, wettable flanks for solder-joint inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Internal 3.1-V LDO output | Power source for internal logic; requires 4.7-µF ceramic capacitor to AGND for stability |
| CBOOT | Bootstrap capacitor node | Drives high-side MOSFET gate; connects to SW via 470-nF capacitor for efficient turn-on |
| SYNC | External clock synchronization input | Accepts 250–500 kHz system clock; enables EMI reduction via frequency alignment |
| PVIN1 / PVIN2 | Main power inputs | Parallel-connected VIN pins reduce PCB trace resistance and thermal stress under 3.5-A load |
| SW | Switch node | Connects to power inductor; low parasitic inductance design minimizes voltage overshoot and ringing |
| PGND1 / PGND2 | Power ground returns | Must be tied together on PCB and connected to AGND; handles high di/dt return current |
| EN | Enable control input | Active-high logic; 1.7–2.0 V threshold with 0.5 V hysteresis prevents false turn-on during supply ramp |
| RESET | Open-drain fault indicator | Asserts low on UVLO, overtemperature, or EN deactivation; includes 24-µs glitch filter |
| FB | Feedback input | Internally tied to 3.3-V reference; no external resistor network required for fixed-output configuration |
| BIAS | Auxiliary bias regulator input | Connected to output to improve light-load efficiency; enables operation with input as low as 3.5 V |
Key Features
| Feature | Design Value |
|---|---|
| Spread-spectrum modulation | ±3% frequency dithering reduces peak conducted EMI by >10 dB, easing CISPR 25 Class 5 compliance |
| Automatic light-load PFM mode | Maintains >85% efficiency at 100 µA load, eliminating need for external LDO in always-on domains |
| Pin-selectable forced PWM | FPWM pin enables constant-frequency operation to avoid audible noise and simplify EMI filtering |
| Integrated protection suite | Includes thermal shutdown (160°C), cycle-by-cycle current limit (4.5–7.5 A HS), UVLO, and soft-start (2.5–5 ms) |
| Wettable flank package | Enables AOI-based solder-joint verification without X-ray; critical for automotive zero-defect manufacturing |
Applications
| Automotive USB Charge | Surround View System ECU |
|---|---|
Use Scenario: Powering dual USB Type-C ports (5 V/3 A each) in center console with battery input (9–16 V) and cold-crank resilience. IC Role / Device Role / Timing Role: Primary 3.3-V rail generator for USB controller, PHY, and PD protocol ICs; provides regulated bias for level shifters and interface buffers. Use Value: 92% efficiency at 3.5-A load minimizes thermal dissipation in confined space; RESET signal validates rail integrity before USB enumeration. |
Use Scenario: Supplying image signal processor (ISP), camera interface, and CAN transceiver in 360° camera fusion ECU. IC Role / Device Role / Timing Role: Fixed 3.3-V domain regulator for ISP core logic and MIPI CSI-2 receiver; synchronized via SYNC pin to avoid beat frequencies with sensor clocks. Use Value: Spread-spectrum operation suppresses switching noise coupling into analog video paths; wettable flanks ensure solder reliability under thermal cycling. |
| Driver Monitoring System | Mechanically Scanning LIDAR |
Use Scenario: Powering eye-tracking SoC and infrared illumination drivers in driver attention monitoring module. IC Role / Device Role / Timing Role: Main 3.3-V supply for vision processor and real-time OS execution; FPWM mode disables during active IR pulse to prevent jitter in timing-critical illumination control. Use Value: 18-µA IQ enables <100-µA system sleep current; thermal shutdown protects against lens-heating-induced enclosure temperature rise. |
Use Scenario: Generating 3.3-V bias for MEMS mirror controller, laser diode driver, and time-of-flight ADC in rotating LIDAR head. IC Role / Device Role / Timing Role: High-reliability DC/DC stage feeding isolated 3.3-V secondary side; BIAS pin connection enables start-up from 3.5-V input during motor stall events. Use Value: 42-V transient tolerance withstands inductive kickback from brushless motor commutation; 0.35-V dropout maintains regulation during 12-V battery sag. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QRNXTQ1 | 5.5-A output, 2.5-V to 36-V input, 2.1-MHz switching, no spread spectrum | Better suited for space-constrained designs needing higher current and faster transient response | Select when >3.5-A load or >1-MHz frequency is required; lacks built-in RESET and spread spectrum |
| TPS543B20RTWR | 3-A output, 4.5–20-V input, PMBus interface, 500-kHz–2.2-MHz programmable frequency | Targeted at digitally controlled power systems requiring telemetry and dynamic voltage scaling | Choose for closed-loop telemetry or adaptive voltage scaling; not AEC-Q100 qualified |
Compared with LM61480QRNXTQ1 and TPS543B20RTWR, the LMS3635NQRNLTQ1 offers superior EMI performance via spread spectrum and automotive-grade RESET functionality in a cost-optimized 3.5-A solution - ideal where analog simplicity, AEC-Q100 compliance, and board-level supervision integration are prioritized over digital control or ultra-high current.
Availability
LMS3635NQRNLTQ1 is available at Aetrix Electronics and suitable for automotive USB charge, surround-view ECU, driver monitoring, and mechanically scanning LIDAR applications requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.
Supply support for LMS3635NQRNLTQ1 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 foundry partnerships.
The LMS3635NQRNLTQ1 belongs to TI's LMS36x5-Q1 family of high-efficiency, low-EMI synchronous buck converters designed specifically for demanding automotive subsystems including ADAS, infotainment, and body electronics.
FAQ
What is the input voltage range for reliable operation of the LMS3635NQRNLTQ1?
The LMS3635NQRNLTQ1 operates reliably from 3.9 V to 36 V after startup, with transient tolerance up to 42 V for ≤500 ms. Its minimum input voltage for full functionality at 3.5-A load is 3.5 V, enabled by BIAS pin connection - making it suitable for automotive cold-crank conditions where battery voltage dips below 6 V. This range is validated per AEC-Q100 Grade 1 specifications.
Does the LMS3635NQRNLTQ1 require external compensation components?
No, the LMS3635NQRNLTQ1 features fully integrated compensation, eliminating the need for external RC networks or type-II/type-III compensators. Its internal loop compensation is optimized for standard 2.2-µH inductors and 22-µF output capacitors, simplifying layout and reducing BOM count - a key advantage over non-compensated controllers like the TPS543B20RTWR.
How does the RESET output of the LMS3635NQRNLTQ1 function in system supervision?
The LMS3635NQRNLTQ1 provides an open-drain RESET output with built-in 24-µs glitch filtering and a 3-ms release timer after fault clearance. It asserts low during UVLO, thermal shutdown, or EN deactivation, and monitors output voltage with ±3% hysteresis relative to 3.3 V. This replaces discrete supervisors like the TLV809, reducing footprint and cost in automotive ECUs.
Can the LMS3635NQRNLTQ1 be synchronized to an external clock?
Yes, the LMS3635NQRNLTQ1 accepts an external clock on the SYNC pin, supporting frequencies from 250 kHz to 500 kHz with 25–75% duty cycle. This allows EMI reduction through frequency alignment with other system clocks - for example, synchronizing to a camera sensor's pixel clock to avoid beat interference in surround-view systems.
What package and assembly advantages does the LMS3635NQRNLTQ1 offer for automotive manufacturing?
The LMS3635NQRNLTQ1 uses a 22-pin VQFN (RNL) package with wettable flanks, enabling automated optical inspection (AOI) of solder joints without X-ray. Its 4.0 mm × 5.0 mm footprint, flip-chip construction, and low-inductance pin layout reduce EMI and improve thermal performance - meeting stringent automotive zero-defect and IPC-A-610 Class 3 requirements.
LMS3635NQRNLTQ1 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)
LMS3635NQRNLTQ1 FAQ
1.How can I place an order for LMS3635NQRNLTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMS3635NQRNLTQ1 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 LMS3635NQRNLTQ1 reliable?
The price and inventory of LMS3635NQRNLTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMS3635NQRNLTQ1 is usually 5 days.
3.What payment methods are accepted for LMS3635NQRNLTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMS3635NQRNLTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMS3635NQRNLTQ1?
LMS3635NQRNLTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMS3635NQRNLTQ1 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 LMS3635NQRNLTQ1?
For technical support, including LMS3635NQRNLTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMS3635NQRNLTQ1 requirements.
6.How does Aetrix verify that LMS3635NQRNLTQ1 is sourced from the original manufacturer or authorized distributors?
All LMS3635NQRNLTQ1 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 LMS3635NQRNLTQ1 meets industry standards.
7.What is the process for return or replacement of LMS3635NQRNLTQ1?
All LMS3635NQRNLTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMS3635NQRNLTQ1, 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 LMS3635NQRNLTQ1 part is unused and in its original packaging.
Return procedure for LMS3635NQRNLTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMS3635NQRNLTQ1 Tags
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