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Texas Instruments LMS3635LQURNLRQ1
- Part No.:
- LMS3635LQURNLRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LMS3635LQURNLRQ1.pdf
- Description:
- IC REG BUCK 5V 3.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,997
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Product details
Overview
LMS3635LQURNLRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering 3.5-A output at 5 V with 400-kHz fixed switching frequency, 94% peak efficiency (13.5 V → 5 V), and integrated RESET output with 3-ms release timer - deployed in USB charging and driver monitoring ECUs.
For engineers reviewing the LMS3635LQURNLRQ1 datasheet, LMS3635LQURNLRQ1 pinout, LMS3635LQURNLRQ1 application, or LMS3635LQURNLRQ1 equivalent, key selection criteria include its 36-V input range with 42-V transient tolerance, ±1.5% reference voltage accuracy, spread-spectrum EMI reduction, FPWM/automatic light-load mode control, and wettable-flank–free 4.0 mm × 5.0 mm SON-22 package.
Technical Context
The LMS3635LQURNLRQ1 implements peak current-mode control with internal compensation, enabling stable regulation across 3.9 V to 36 V input while maintaining 400 kHz ±10% switching frequency. 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), open-drain RESET with built-in 24-µs glitch filter and 3-ms release delay, and dual-mode operation: forced PWM (FPWM = high) or automatic diode-emulation PFM (FPWM = low), with seamless transition between modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3.5 A continuous - supports automotive USB ports and camera power rails without external current boosting |
| Input Voltage Range | 3.9 V to 36 V - accommodates cold-crank (≥3.5 V start-up) and load-dump transients up to 42 V for ≤500 ms |
| Fixed Output Voltage | 5 V ±1.5% - meets USB 2.0/3.0 power rail tolerance without external feedback divider |
| Switching Frequency | 400 kHz ±10% - enables compact 2.2-µH inductors and reduces EMI fundamental below AM band |
| Quiescent Current | 18 µA at 3.3 VOUT, no load - extends battery runtime in always-on vehicle modules |
| Dropout Voltage | 0.35 V at 3.5 A, 25°C - sustains regulation during low-input conditions (e.g., 5.35 V input → 5 V output) |
| RESET Function | Open-drain, 3-ms release timer, 105%/94% VOUT thresholds - replaces discrete supervisor IC in safety-critical ECUs |
Pinout & Package
Package: SON-22 (RNL), 4.00 mm × 5.00 mm, non-wettable flanks - optimized for automated optical inspection (AOI) without x-ray.
| 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 |
| SYNC | External clock input | Accepts 250–500 kHz system clock (rising-edge triggered); enables multi-rail synchronization |
| PVIN1 / PVIN2 | Power input supply pins | Parallel-connected VIN paths - reduce PCB trace resistance and thermal stress under 3.5-A load |
| SW | Switch node | Connects to power inductor; low parasitic inductance due to flip-chip layout minimizes voltage overshoot |
| PGND1 / PGND2 | Power ground terminals | Must be shorted on PCB to minimize return path inductance and improve thermal dissipation |
| EN | Enable input | Active-high logic control (1.7–2.0 V threshold); hysteresis prevents chatter during marginal supply conditions |
| RESET | Open-drain fault indicator | Asserts low on UVLO, thermal shutdown, or EN deactivation; requires external pullup resistor |
| FB | Feedback input | Internally tied to 5-V reference - no external divider needed for fixed-output configuration |
| BIAS | Auxiliary bias regulator input | Connected to output rail to improve light-load efficiency and reduce VCC dropout risk |
Key Features
| Feature | Design Value |
|---|---|
| Spread-spectrum modulation | ±3% frequency dithering reduces peak conducted EMI by >10 dB, easing CISPR 25 Class 5 compliance |
| Integrated soft-start | 4-ms internal ramp - prevents inrush current and output voltage overshoot during power-up |
| Thermal shutdown | 160°C trip with 15°C hysteresis - protects against sustained overload or poor heatsinking in enclosed ECUs |
| High-side/low-side current limits | 6 A / 4.5 A typical - provides robust short-circuit protection without external sensing resistors |
| Low EMI switch-node waveform | Reduced ringing via flip-chip packaging and optimized internal routing - cuts radiated emissions at 100–300 MHz |
Applications
| Automotive USB Charging | Driver Monitoring System |
|---|---|
Use Scenario: Powering dual-port 5-V USB Type-A outputs in center console modules with cold-crank and load-dump immunity. IC Role / Device Role / Timing Role: Primary 5-V buck regulator supplying USB PD controllers and port power switches. Use Value: 36-V input range and 42-V transient tolerance eliminate need for upstream TVS clamping; 18-µA quiescent current meets ISO 16750-2 sleep-mode requirements. |
Use Scenario: Supplying image signal processor (ISP) and near-infrared LED drivers in cabin-facing driver attention systems. IC Role / Device Role / Timing Role: Stable 5-V rail generator with fast transient response for burst-mode ISP operation. Use Value: 94% efficiency at 3.5-A load minimizes thermal rise in space-constrained dash modules; RESET output validates rail integrity before ISP boot. |
| Surround View ECU | Mechanically Scanning LIDAR |
Use Scenario: Powering four-channel video decoders and FPGA I/O banks in 360° camera fusion units. IC Role / Device Role / Timing Role: High-current 5-V source with synchronized switching (via SYNC pin) to suppress beat frequencies across multiple converters. Use Value: 400-kHz fixed frequency + external sync capability enables deterministic EMI alignment across 4+ parallel LMS3635LQURNLRQ1 rails. |
Use Scenario: Generating 5-V bias for MEMS mirror drivers and time-of-flight sensor interfaces in rotating LIDAR heads. IC Role / Device Role / Timing Role: Compact, high-reliability DC/DC stage operating in wide ambient (-40°C to +125°C) with vibration-resistant SON package. Use Value: AEC-Q100 Grade 1 qualification and 150°C junction rating ensure functional safety in sealed, thermally isolated LIDAR housings. |
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 | 5.5-A output, 2.5-V to 36-V input, 2.1-MHz switching, no integrated RESET | Better suited for space-constrained designs requiring higher frequency and smaller magnetics; lacks built-in reset supervision | Select when board area is critical and external reset IC is acceptable |
| TPS543B20RTWR | 3.5-A, 4.5–20-V input, 500-kHz, PMBus interface, no spread spectrum | Supports digital telemetry and dynamic voltage scaling; requires external configuration EEPROM and PMBus host | Select when system-level telemetry, margining, or adaptive voltage control is required |
Compared with LM61480QRNLRQ1 and TPS543B20RTWR, the LMS3635LQURNLRQ1 uniquely combines AEC-Q100 Grade 1 qualification, integrated RESET with filtering, spread-spectrum EMI reduction, and non-wettable flank packaging - making it optimal for cost-sensitive, safety-aware automotive power rails where supervisory integration and manufacturability are prioritized over programmability or ultra-high frequency.
Availability
LMS3635LQURNLRQ1 is available at Aetrix Electronics and suitable for automotive USB charging, driver monitoring systems, surround view ECUs, mechanically scanning LIDAR, and vehicle-to-vehicle communication modules requiring stable component supply across extended temperature and lifecycle demands.
Supply support for LMS3635LQURNLRQ1 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 AEC-Q100 portfolio coverage.
The LMS3635LQURNLRQ1 belongs to TI's LMS36x5-Q1 family of high-efficiency, low-EMI synchronous buck regulators designed specifically for demanding automotive subsystems including ADAS sensors, infotainment, and body electronics.
FAQ
What is the maximum input voltage transient tolerance for the LMS3635LQURNLRQ1?
The LMS3635LQURNLRQ1 withstands input transients up to 42 V for durations ≤500 ms at a duty cycle ≤0.01%, per Absolute Maximum Ratings. This enables direct connection to automotive battery rails without additional transient suppression components in most cold-crank and load-dump scenarios. The device remains fully functional within its 3.9–36 V recommended operating range.
Does the LMS3635LQURNLRQ1 require external compensation components?
No, the LMS3635LQURNLRQ1 features built-in compensation circuitry optimized for standard 2.2-µH inductors and 22-µF output capacitors. No external RC networks or compensation pins are needed - simplifying design, reducing BOM count, and improving production yield. Full stability is ensured across the entire input/output/load range per TI's typical application schematic.
How does the RESET output of the LMS3635LQURNLRQ1 function during startup and fault conditions?
The LMS3635LQURNLRQ1 RESET output is an open-drain signal that remains low for 3 ms after EN goes high (soft-start completion), then transitions high if VOUT reaches ≥105% of nominal. It asserts low again on UVLO, thermal shutdown, or EN deactivation. Internal 24-µs glitch filtering prevents false triggers from noise, eliminating need for external RC debounce circuits.
Can the LMS3635LQURNLRQ1 operate with input voltage below 3.9 V?
Yes - the LMS3635LQURNLRQ1 supports minimum input voltage of 3.55 V (rising) for startup and 3.25 V (falling) for continued operation, enabling functionality during deep cold-crank events. However, full 3.5-A output capability requires ≥3.5 V input per system characteristics; operation below 3.5 V may limit load current or require reduced switching frequency via SYNC.
Is the LMS3635LQURNLRQ1 pin-compatible with other devices in the LMS36x5-Q1 family?
No - the LMS3635LQURNLRQ1 shares the same 22-pin SON (RNL) package and pinout with all LMS3635-Q1 variants (e.g., LMS36355QRNLRQ1, LMS3635AQRNLRQ1), but is not pin-compatible with LMS3655-Q1 devices despite identical footprint. Key differences include current-limit thresholds and internal current-sense scaling; substituting LMS3655-Q1 parts requires validation of thermal and transient performance.
LMS3635LQURNLRQ1 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):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 3.5A
- Frequency - Switching:
- 2.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 22-VQFN-HR (5x4)
LMS3635LQURNLRQ1 FAQ
1.How can I place an order for LMS3635LQURNLRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMS3635LQURNLRQ1 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 LMS3635LQURNLRQ1 reliable?
The price and inventory of LMS3635LQURNLRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMS3635LQURNLRQ1 is usually 5 days.
3.What payment methods are accepted for LMS3635LQURNLRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMS3635LQURNLRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMS3635LQURNLRQ1?
LMS3635LQURNLRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMS3635LQURNLRQ1 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 LMS3635LQURNLRQ1?
For technical support, including LMS3635LQURNLRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMS3635LQURNLRQ1 requirements.
6.How does Aetrix verify that LMS3635LQURNLRQ1 is sourced from the original manufacturer or authorized distributors?
All LMS3635LQURNLRQ1 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 LMS3635LQURNLRQ1 meets industry standards.
7.What is the process for return or replacement of LMS3635LQURNLRQ1?
All LMS3635LQURNLRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMS3635LQURNLRQ1, 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 LMS3635LQURNLRQ1 part is unused and in its original packaging.
Return procedure for LMS3635LQURNLRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMS3635LQURNLRQ1 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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