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Texas Instruments LMS3635AQRNLTQ1
- Part No.:
- LMS3635AQRNLTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LMS3635AQRNLTQ1.pdf
- Description:
- IC REG BUCK ADJ 3.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:147
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Product details
Overview
LMS3635AQRNLTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering up to 3.5 A at adjustable output (1 V to 20 V), fixed 3.3 V or 5 V, with 400-kHz fixed switching frequency, 96% peak efficiency at 12 V → 5 V, and integrated RESET with 3-ms release timer - deployed in driver monitoring and surround-view ECU power rails.
For engineers reviewing the LMS3635AQRNLTQ1 datasheet, LMS3635AQRNLTQ1 pinout, LMS3635AQRNLTQ1 application, or LMS3635AQRNLTQ1 equivalent, key selection criteria include its 36-V input range with 42-V transient tolerance, 18-µA quiescent current at 3.3 VOUT/no load, ±1.5% reference voltage tolerance, and wettable-flank 22-pin VQFN (4.0 mm × 5.0 mm) package for automotive-grade solder-joint inspection.
Technical Context
The LMS3635AQRNLTQ1 employs peak current mode control with built-in compensation, enabling stable regulation across 3.5 V–36 V input while supporting seamless PWM/PSM transition. Its flip-chip VQFN construction minimizes switch-node ringing and radiated EMI through parasitic inductance reduction and magnetic field cancellation.
It integrates a 3.1-V internal LDO (VCC), bootstrap gate drive (CBOOT), open-drain RESET with internal filtering, and FPWM mode control - all operating over –40°C to +125°C ambient with junction ratings up to +150°C. External synchronization (250–500 kHz) and frequency foldback extend low-input operation down to 3.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 36 V (42 V transient tolerant for ≤500 ms); enables direct battery connection without pre-regulator |
| Output Current | 3.5 A continuous; supports high-current automotive subsystems like camera ECUs and radar sensors |
| Switching Frequency | 400 kHz ±10%; allows compact 2.2-µH inductors and reduces EMI filter size |
| Quiescent Current | 18 µA at VIN=13.5 V, VOUT=3.3 V, no load; extends battery runtime in always-on modules |
| Reference Voltage Accuracy | ±1.5% over –40°C to +125°C; ensures tight output regulation across automotive thermal zones |
| Duty Cycle Limit | 96% max (98% in dropout); maintains regulation under low VIN–VOUT differential conditions |
| RESET Output | Open-drain with 3-ms release timer and 24-µs glitch filter; replaces external supervisor IC |
| Thermal Resistance | RθJA = 29.4°C/W on 4-layer FR4; supports 3.5-A operation without forced airflow |
Pinout & Package
Package: 22-pin VQFN (RNL), 4.00 mm × 5.00 mm body, wettable flanks for automated optical solder-joint inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VCC | Internal 3.1-V LDO output | Power source for internal control circuitry; requires 4.7-µF ceramic capacitor to AGND |
| 2 CBOOT | Bootstrap capacitor node | Drives high-side MOSFET gate; connects via 470-nF capacitor to SW pin |
| 3 SYNC | External clock input | Accepts 250–500 kHz system clock (rising-edge triggered); enables multi-rail synchronization |
| 4,14 PVIN1/PVIN2 | Main power inputs | Parallel-connected high-current VIN paths; bypass directly to PGND pins |
| 5,10 PGND1/PGND2 | Power ground return | Low-impedance return for internal low-side MOSFET; must be tied together and to AGND |
| 9 SW | Switch node | Connects to power inductor; high dv/dt node requiring minimized loop area |
| 15 AVIN | Analog supply input | Bias source for analog circuits; connect directly to PVIN1/PVIN2 on PCB |
| 16 FPWM | Forced PWM mode control | High = fixed-frequency operation; low = automatic light-load PFM; must not float |
| 18 EN | Enable input | Active-high logic control; 1.7–2.0 V threshold with 0.5 V hysteresis; supports wake-up from sleep |
| 19 RESET | Open-drain fault indicator | Asserts low during UVLO, overtemperature, or EN deactivation; requires external pullup |
| 20 AGND | Analog ground reference | Reference for FB, VREF, and internal comparators; tie to PGND at single-point star ground |
| 21 FB | Feedback input | Connects to resistor divider for adjustable output; 1.0-V internal reference (±1.5%) |
| 22 BIAS | Auxiliary bias input | Improves efficiency at light loads when connected to VOUT; required for extended 1–20 V range |
Key Features
| Feature | Design Value |
|---|---|
| Integrated compensation | Eliminates external Type-II/III compensation network; reduces BOM count and layout sensitivity |
| Automatic light-load PFM mode | Maintains >85% efficiency at 10-mA load; critical for always-on automotive modules |
| Wettable flank package | Enables AOI-based solder-joint verification without X-ray; meets IPC-A-610 Class 3 requirements |
| Frequency foldback architecture | Regulates 3.3 V output from as low as 3.5 V input; supports cold-crank scenarios |
| Low EMI switch-node waveform | Reduced overshoot/ringing via flip-chip layout and magnetic field cancellation; eases CISPR-25 compliance |
| Built-in protection suite | Includes thermal shutdown (160–185°C), cycle-by-cycle current limit, UVLO, and hiccup-mode short-circuit response |
Applications
| Automotive USB Charge | Driver Monitoring System |
|---|---|
Use Scenario: Powering dual-port 5-V USB charging circuits in center console or rear-seat modules. IC Role / Device Role / Timing Role: Primary 5-V buck regulator supplying USB PD controller and port power switches. Use Value: 96% efficiency at 12 V → 5 V/3.5 A reduces thermal stress; 42-V transient tolerance handles load-dump events without external TVS. |
Use Scenario: Supplying image signal processor (ISP) and CMOS image sensor in cabin-facing driver attention cameras. IC Role / Device Role / Timing Role: High-accuracy 3.3-V rail generator with low-noise output for analog front-end and ADC reference. Use Value: ±1.5% reference tolerance and <24-µs RESET glitch filter ensure reliable boot sequencing and fault detection per ISO 26262 ASIL-B requirements. |
| Surround View System ECU | Mechanically Scanning LIDAR |
Use Scenario: Providing stable 5-V and 3.3-V rails to multi-camera fusion ECU with CAN/FlexRay interface. IC Role / Device Role / Timing Role: Dual-output capable buck regulator (via multiple instances) powering SoC, memory, and interface PHYs. Use Value: 400-kHz fixed frequency enables predictable EMI filtering; SYNC input allows phase alignment across multiple rails to suppress beat frequencies. |
Use Scenario: Generating precision 5-V bias for laser diode drivers and 3.3-V supply for time-of-flight (ToF) timing ASICs. IC Role / Device Role / Timing Role: High-transient-response buck converter supporting rapid laser pulsing and high-speed ADC sampling. Use Value: 60-ns minimum on-time and fast mode transition (<500 µs) enable tight regulation during dynamic load steps from standby to active scan. |
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, smaller 12-pin VQFN (3.5 mm × 4.5 mm) | Better suited for space-constrained, high-frequency designs requiring faster transient response | Select when board area is limited and higher switching frequency is acceptable for reduced inductor size |
| TPS543B20RTWT | 3.5-A, 4.5-V to 18-V input, 500-kHz to 2.2-MHz programmable frequency, PMBus interface | Requires digital configuration; adds telemetry but increases firmware complexity | Select when real-time telemetry (voltage/current/temperature) and dynamic margining are required |
Compared with LM61480QRNXTQ1 and TPS543B20RTWT, the LMS3635AQRNLTQ1 offers superior 42-V transient tolerance and integrated RESET-critical for unregulated automotive battery rails-while maintaining lower quiescent current (18 µA vs. 25 µA) and simpler analog-only configuration.
Availability
LMS3635AQRNLTQ1 is available at Aetrix Electronics and suitable for automotive USB charge, driver monitoring, surround view system ECU, and mechanically scanning LIDAR applications requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.
Supply support for LMS3635AQRNLTQ1 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 power management ICs, with deep expertise in automotive-grade reliability and functional safety.
The LMS3635AQRNLTQ1 belongs to TI's LMS36x5-Q1 family of AEC-Q100 Grade 1 synchronous buck converters, designed specifically for demanding automotive power rails where high efficiency, low IQ, and robust transient handling are mandatory.
FAQ
What is the maximum input voltage rating for the LMS3635AQRNLTQ1, and how does it handle transients?
The LMS3635AQRNLTQ1 has an absolute maximum input voltage rating of 40 V, with transient tolerance up to 42 V for ≤500 ms at ≤0.01% duty cycle. This enables direct connection to automotive 12-V battery systems without external TVS diodes during load-dump events, simplifying front-end protection design while maintaining reliability per ISO 7637-2.
Does the LMS3635AQRNLTQ1 support adjustable output voltage, and what is the supported range?
Yes, the LMS3635AQRNLTQ1 supports adjustable output from 1 V to 20 V using an external resistor divider on the FB pin. Operation below 3.3 V or above 6 V may require schematic modifications, and outputs above 15 V require grounding or externally powering the BIAS pin - confirmed in the device's recommended operating conditions table.
How does the RESET output function on the LMS3635AQRNLTQ1, and what are its timing characteristics?
The LMS3635AQRNLTQ1 features an open-drain RESET output with internal 24-µs glitch filtering and a 3-ms release timer after fault clearance. It asserts low during EN deactivation, UVLO, or thermal shutdown, and its threshold tracks output voltage (92–96.5% falling, 105–110% rising), eliminating need for external supervisor ICs in ASIL-B systems.
What package type and thermal performance does the LMS3635AQRNLTQ1 use?
The LMS3635AQRNLTQ1 uses a 22-pin VQFN (RNL) package with 4.0 mm × 5.0 mm body and wettable flanks. On a thermally optimized 4-layer FR4 board, its RθJA is 29.4°C/W, enabling full 3.5-A operation at +125°C ambient without forced airflow - verified in TI's SNAS714C datasheet Section 7.5.
Is the LMS3635AQRNLTQ1 pin-compatible with other devices in the LMS36x5-Q1 family?
No - the LMS3635AQRNLTQ1 shares the same 22-pin VQFN (RNL) package and pinout with all LMS36x5-Q1 variants (e.g., LMS3655-Q1), but differs in internal current-limit thresholds and MOSFET RDS(on). While footprint-compatible, it is not a drop-in replacement for 5.5-A versions due to lower IL-HS/IL-LS limits (4.5–7.5 A vs. 6.7–9.5 A).
LMS3635AQRNLTQ1 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.9V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 15V
- 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)
LMS3635AQRNLTQ1 FAQ
1.How can I place an order for LMS3635AQRNLTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMS3635AQRNLTQ1 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 LMS3635AQRNLTQ1 reliable?
The price and inventory of LMS3635AQRNLTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMS3635AQRNLTQ1 is usually 5 days.
3.What payment methods are accepted for LMS3635AQRNLTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMS3635AQRNLTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMS3635AQRNLTQ1?
LMS3635AQRNLTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMS3635AQRNLTQ1 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 LMS3635AQRNLTQ1?
For technical support, including LMS3635AQRNLTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMS3635AQRNLTQ1 requirements.
6.How does Aetrix verify that LMS3635AQRNLTQ1 is sourced from the original manufacturer or authorized distributors?
All LMS3635AQRNLTQ1 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 LMS3635AQRNLTQ1 meets industry standards.
7.What is the process for return or replacement of LMS3635AQRNLTQ1?
All LMS3635AQRNLTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMS3635AQRNLTQ1, 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 LMS3635AQRNLTQ1 part is unused and in its original packaging.
Return procedure for LMS3635AQRNLTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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