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Texas Instruments LMS3635AQRNLRQ1
- Part No.:
- LMS3635AQRNLRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LMS3635AQRNLRQ1.pdf
- Description:
- IC REG BUCK ADJ 3.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,008
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Product details
Overview
LMS3635AQRNLRQ1 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), with 400-kHz fixed switching frequency, 96% peak efficiency (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 LMS3635AQRNLRQ1 datasheet, LMS3635AQRNLRQ1 pinout, LMS3635AQRNLRQ1 application, or LMS3635AQRNLRQ1 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 SON-22 package for automated optical inspection.
Technical Context
The LMS3635AQRNLRQ1 implements peak current mode control with internal compensation and seamless PWM/PFM transition, enabling high efficiency across light-to-full load. Its flip-chip VQFN construction minimizes switch-node ringing and radiated EMI via partial magnetic field cancellation.
It features a dedicated BIAS pin for auxiliary bias regulation, external SYNC input (250–500 kHz), FPWM mode control, and an open-drain RESET output with built-in 24-µs glitch filter and 2–4 ms activation delay - all operating over –40°C to +125°C ambient with 150°C junction limit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.9 V to 36 V (42 V/500 ms transient tolerant); enables direct battery connection without pre-regulation |
| Output Current | 3.5 A continuous; supports automotive USB charge and LIDAR subsystems with margin |
| Switching Frequency | 400 kHz ±10%; allows compact 2.2-µH inductors and reduces EMI filtering cost |
| Quiescent Current | 18 µA at 3.3 VOUT/no load; extends battery runtime in always-on vehicle modules |
| Reference Voltage | 1.000 V ±1.5% (adjustable version); ensures ≤±2.25% output accuracy over full load/temperature |
| Duty Cycle Max | 96% (normal), 98% (dropout); supports low-VIN operation down to 3.5 V at 3.3 VOUT |
| RESET Delay | 3-ms release timer after fault clearance; provides stable system reset sequencing |
Pinout & Package
Package: SON-22 (VQFN), 4.00 mm × 5.00 mm, wettable flanks - optimized for AOI-compatible solder joint inspection and thermal performance (RθJA = 29.4°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Internal 3.1-V LDO output | Power source for control circuitry; requires 4.7-µF ceramic capacitor to AGND |
| CBOOT | Bootstrap capacitor node | Drives high-side MOSFET gate; connects via 470-nF capacitor to SW |
| SYNC | External clock synchronization input | Accepts 250–500 kHz rising-edge-triggered system clock for EMI reduction |
| PVIN1 / PVIN2 | Main power inputs | Parallel-connected VIN pins; require local ceramic bypass capacitors to PGND |
| SW | Switch node | Connects to power inductor; high di/dt path requiring tight layout and ground stitching |
| PGND1 / PGND2 | Power ground terminals | Must be tied together and connected to AGND/system ground at single point |
| AVIN | Analog input supply | Connected to PVIN; supplies analog blocks including error amplifier and reference |
| FPWM | Forced PWM mode control | High = fixed-frequency operation; low = automatic light-load PFM mode |
| EN | Enable input | Active-high logic; 1.7–2.0 V threshold with 0.5 V hysteresis; no floating allowed |
| RESET | Open-drain fault indicator | Asserts low during UVLO, overtemp, or EN deactivation; requires pull-up resistor |
| AGND | Analog ground reference | Reference for FB, VREF, and internal circuits; must be star-connected to PGND |
| FB | Feedback input | Connects to resistive divider for adjustable output; 1-V reference sets VOUT = 1×(1+R1/R2) |
| BIAS | Auxiliary bias regulator input | Connected to output; improves light-load efficiency and enables <3.5-V start-up |
Key Features
| Feature | Design Value |
|---|---|
| Integrated compensation network | Eliminates external loop compensation components, reducing BOM count and layout sensitivity |
| Automatic light-load PFM mode | Maintains >90% efficiency at 10-mA load, critical for always-on automotive modules |
| Wettable-flank SON package | Enables reliable AOI-based solder joint inspection without x-ray, improving manufacturing yield |
| RESET with internal filter & timer | Provides glitch-free, delay-stabilized system reset signal - removes need for external supervisor IC |
| Low dropout: 0.35 V @ 3.5 A | Supports high-efficiency operation near minimum input, e.g., cold-crank 6-V battery scenarios |
Applications
| Automotive USB Charging | Driver Monitoring System |
|---|---|
Use Scenario: Powering dual-port 5-V USB Type-A outputs in center console with battery input (9–16 V) and cold-crank support. IC Role / Device Role / Timing Role: Primary 5-V buck regulator with adjustable feedback for precise voltage regulation and RESET-driven microcontroller supervision. Use Value: 96% peak efficiency and 18-µA IQ extend standby time; 42-V transient tolerance eliminates need for upstream TVS clamping. |
Use Scenario: Supplying image sensor and SoC in cabin-facing driver attention monitoring camera module. IC Role / Device Role / Timing Role: Adjustable-output (3.3 V or 1.8 V) power stage with soft-start and RESET for controlled boot sequence. Use Value: Seamless PWM/PFM transition ensures clean power during motion-triggered wake-up; wettable flanks enable AOI on space-constrained PCB. |
| Surround-View ECU | Mechanically Scanning LIDAR |
Use Scenario: Generating 3.3-V rail for multi-camera video processor and FPGA in 360° vehicle perception unit. IC Role / Device Role / Timing Role: High-current (3.5-A) synchronous buck with SYNC input for synchronized switching across multiple rails. Use Value: 400-kHz fixed frequency simplifies EMI filter design; thermal shutdown at 160°C protects against enclosure overheating. |
Use Scenario: Providing stable 5-V supply to laser diode driver and timing controller in rotating LIDAR head. IC Role / Device Role / Timing Role: Input-transient-hardened buck converter with BIAS pin support for low-input operation during motor startup. Use Value: 3.5-V minimum input capability enables operation during 12-V bus sag; low EMI switch-node waveform prevents interference with analog timing signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QRNLRQ1 | 5-A output, 2.5-V to 36-V input, 2.1-MHz switching, lower IQ (15 µA), no integrated RESET | Better suited for space-constrained designs needing higher frequency; lacks built-in reset functionality | Select when higher switching frequency and smaller magnetics are prioritized over integrated supervision |
| TPS543B20RTWR | 3-A output, 4.5-V to 18-V input, PMBus interface, 500-kHz to 2.2-MHz programmable frequency, no AEC-Q100 | Requires external configuration; not qualified for automotive use; adds digital control overhead | Choose only for non-automotive industrial applications requiring telemetry and dynamic reconfiguration |
Compared with LM61480QRNLRQ1 and TPS543B20RTWR, the LMS3635AQRNLRQ1 uniquely combines AEC-Q100 Grade 1 qualification, integrated RESET with filter/timer, wettable-flank packaging, and 36-V input with 42-V surge tolerance - making it optimal for safety-critical automotive power rails where reliability and BOM simplification are mandatory.
Availability
LMS3635AQRNLRQ1 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 LMS3635AQRNLRQ1 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 solutions, with decades of automotive qualification expertise.
The LMS3635-Q1 belongs to TI's AEC-Q100-compliant synchronous buck converter family, engineered specifically for demanding automotive subsystems requiring high efficiency, low IQ, wide input range, and integrated supervision - including ADAS, infotainment, and body electronics.
FAQ
What is the maximum input voltage rating for the LMS3635AQRNLRQ1?
The LMS3635AQRNLRQ1 has an absolute maximum input voltage rating of 40 V across AVIN, PVIN1, and PVIN2 pins. It sustains 42 V transients for up to 500 ms at ≤0.01% duty cycle - enabling robust operation during automotive load-dump events without external clamping components.
Does the LMS3635AQRNLRQ1 support adjustable output voltage?
Yes, the LMS3635AQRNLRQ1 supports adjustable output from 1 V to 20 V using an external resistor divider on the FB pin. Its internal 1.000-V reference (±1.5%) sets VOUT = 1 V × (1 + R1/R2), and operation above 15 V requires grounding or externally powering the BIAS pin.
What is the purpose of the BIAS pin on the LMS3635AQRNLRQ1?
The BIAS pin on the LMS3635AQRNLRQ1 supplies the auxiliary bias regulator. Connecting it to the output improves light-load efficiency and enables operation with input voltages as low as 3.5 V - critical for cold-crank scenarios in automotive applications where battery voltage sags below nominal levels.
How does the RESET function operate on the LMS3635AQRNLRQ1?
The LMS3635AQRNLRQ1's open-drain RESET pin asserts low during EN deactivation, UVLO, or thermal shutdown. It features a built-in 24-µs glitch filter and 2–4 ms release delay after fault clearance, providing a clean, debounced system reset signal that eliminates the need for external supervisor ICs in most automotive designs.
Is the LMS3635AQRNLRQ1 pin-compatible with other devices in the LMS36x5-Q1 family?
No - the LMS3635AQRNLRQ1 shares the same SON-22 package and pinout as all LMS36x5-Q1 variants (including LMS3655-Q1), but differs in internal current-limit thresholds and maximum output current (3.5 A vs. 5.5 A). Electrical compatibility requires verification of HS/LS current limits and thermal design margins for the target load.
LMS3635AQRNLRQ1 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)
LMS3635AQRNLRQ1 FAQ
1.How can I place an order for LMS3635AQRNLRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMS3635AQRNLRQ1 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 LMS3635AQRNLRQ1 reliable?
The price and inventory of LMS3635AQRNLRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMS3635AQRNLRQ1 is usually 5 days.
3.What payment methods are accepted for LMS3635AQRNLRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMS3635AQRNLRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMS3635AQRNLRQ1?
LMS3635AQRNLRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMS3635AQRNLRQ1 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 LMS3635AQRNLRQ1?
For technical support, including LMS3635AQRNLRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMS3635AQRNLRQ1 requirements.
6.How does Aetrix verify that LMS3635AQRNLRQ1 is sourced from the original manufacturer or authorized distributors?
All LMS3635AQRNLRQ1 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 LMS3635AQRNLRQ1 meets industry standards.
7.What is the process for return or replacement of LMS3635AQRNLRQ1?
All LMS3635AQRNLRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMS3635AQRNLRQ1, 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 LMS3635AQRNLRQ1 part is unused and in its original packaging.
Return procedure for LMS3635AQRNLRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMS3635AQRNLRQ1 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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