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Texas Instruments LMS3635MQRNLRQ1
- Part No.:
- LMS3635MQRNLRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LMS3635MQRNLRQ1.pdf
- Description:
- IC REG BUCK ADJ 3.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,549
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Product details
Overview
LMS3635MQRNLRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering up to 3.5 A output current, with 36-V max input, 400-kHz fixed switching frequency (±10%), adjustable output (1 V to 20 V), and spread-spectrum EMI reduction - deployed in surround-view ECU power rails and driver monitoring systems.
For engineers reviewing the LMS3635MQRNLRQ1 datasheet, LMS3635MQRNLRQ1 pinout, LMS3635MQRNLRQ1 application, or LMS3635MQRNLRQ1 equivalent, this page delivers verified package mapping (22-pin VQFN RNL), confirmed thermal metrics (RθJA = 29.4°C/W on 4-layer PCB), validated reset timing (3-ms release), and real-world efficiency data (94% @ 13.5 V → 5 V, 3.5 A).
Technical Context
The LMS3635MQRNLRQ1 implements peak-current-mode control with internal compensation and seamless PWM/PFM transition, enabling stable regulation across 3.5 V–36 V input while maintaining ≥92% efficiency at light 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), open-drain RESET with 24-µs glitch filter and 3-ms release timer, external SYNC input (250–500 kHz), and FPWM mode control - all operating across –40°C to +150°C junction temperature with AEC-Q100 HBM ±2500 V and CDM ±1000 V ratings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V (min start-up) to 36 V (max continuous); withstands 42 V transients ≤500 ms |
| Output Current | 3.5 A continuous; high-side current limit 4.5–7.5 A (typ. 6 A) |
| Switching Frequency | 400 kHz ±10% fixed; supports external sync from 250–500 kHz |
| Quiescent Current | 18 µA @ VIN=13.5 V, VOUT=3.3 V, no load - enables always-on automotive subsystems |
| Output Voltage Accuracy | ±1.5% reference tolerance; ±2.25% system accuracy over full load/temperature range |
| Dropout Voltage | 0.35 V @ 3.5 A, 25°C - supports low-headroom operation near VOUT |
| RESET Function | Open-drain output with 3-ms release delay and 24-µs internal glitch filter - replaces discrete supervisor IC |
Pinout & Package
Package: 22-pin VQFN (RNL), 4.00 mm × 5.00 mm body size, wettable flanks for automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Internal 3.1-V LDO output | Power source for internal control circuitry; requires 4.7-µF capacitor to AGND |
| CBOOT | Bootstrap capacitor node | Drives high-side MOSFET gate; connects to SW via 470-nF capacitor |
| SYNC | External clock input | Accepts 250–500 kHz rising-edge-triggered system clock for synchronization |
| PVIN1 / PVIN2 | Main power inputs | Parallel-connected VIN pins; must tie directly together and decouple locally to PGND |
| SW | Switch node | Connects to power inductor; high dv/dt node requiring tight layout and minimal trace area |
| PGND1 / PGND2 | Power ground terminals | Low-side MOSFET return paths; must be tied together and connected to AGND |
| AVIN | Analog supply input | Bias source for analog circuits; connect directly to PVIN network |
| FPWM | Mode control input | High = forced PWM; low = automatic light-load (PFM) mode; must not float |
| EN | Enable input | Active-high logic; 1.7–2.0 V threshold with 0.45–0.55 V hysteresis |
| RESET | Open-drain fault flag | Asserts low on EN deactivation or output fault; requires external pullup resistor |
| AGND | Analog ground reference | Reference for FB, VREF, and internal error amplifier; connect to PGND at single point |
| FB | Feedback input | Monitors output voltage divider (for ADJ version) or connects directly to VOUT (fixed versions) |
| BIAS | Auxiliary bias input | Connected to VOUT to reduce quiescent current; grounded or externally powered above 15 V VOUT |
Key Features
| Feature | Design Value |
|---|---|
| Spread-spectrum modulation | ±3% frequency dithering reduces peak conducted EMI by >10 dB without external filters |
| Integrated RESET with timing | On-chip 3-ms release timer and 24-µs glitch filter eliminate need for external supervisor IC and RC network |
| Low-IQ light-load operation | 18 µA VIN quiescent current enables >10-year battery life in always-on vehicle modules |
| Flip-chip VQFN packaging | Reduced parasitic inductance and magnetic field cancellation minimize switch-node overshoot and radiated noise |
| Wide-input dropout capability | Regulates down to VIN = VOUT + 0.35 V at 3.5 A, supporting ultra-low-headroom applications like 3.8 V → 3.3 V |
Applications
| Automotive USB Charging | Driver Monitoring System |
|---|---|
Use Scenario: Powering dual-port 5-V USB Type-A outputs from 12-V battery with surge immunity. IC Role / Device Role / Timing Role: Primary 5-V buck regulator with integrated RESET for host MCU supervision. Use Value: 94% efficiency at 3.5 A eliminates heatsink; 42-V transient tolerance removes need for upstream TVS diode. |
Use Scenario: Supplying image signal processor (ISP) and CMOS sensor in cabin-facing camera module. IC Role / Device Role / Timing Role: Adjustable 1.2-V rail generator with soft-start and precise RESET assertion for safe boot sequencing. Use Value: ±1.5% reference tolerance ensures consistent sensor bias; 3-ms RESET release guarantees clean ISP initialization. |
| Surround-View ECU | Mechanically Scanning LIDAR |
Use Scenario: Generating 3.3-V logic rail for multi-camera fusion controller in 360° video processing unit. IC Role / Device Role / Timing Role: High-current 3.3-V buck stage with SYNC input synchronized to master video clock. Use Value: 400-kHz fixed frequency enables predictable EMI placement; spread spectrum avoids interference with video bandwidth. |
Use Scenario: Powering laser diode driver and time-of-flight (ToF) receiver ASIC in rotating LIDAR head. IC Role / Device Role / Timing Role: Compact 5-V/3.5-A supply with low EMI profile to prevent signal corruption in sensitive analog front-end. Use Value: Flip-chip VQFN reduces radiated emissions below CISPR 25 Class 5 limits; wettable flanks ensure solder joint reliability under vibration. |
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 | 5.5-A output, 2.5-V min input, 2.1-MHz switching, no spread spectrum | Better suited for space-constrained designs needing higher frequency and smaller inductors | Select when board area is critical and EMI filtering can be added externally |
| TPS543B20RSAR | 3-A output, 4.5–18-V input, PMBus interface, 500-kHz–2.2-MHz programmable frequency | Required for digital power management, telemetry, and dynamic voltage scaling | Select when closed-loop telemetry, margining, or firmware-controlled configuration is needed |
Compared with LM61480QRNLRQ1 and TPS543B20RSAR, the LMS3635MQRNLRQ1 provides superior automotive qualification (Grade 1, 150°C junction), integrated spread-spectrum EMI reduction, and lower quiescent current - making it optimal for cost-sensitive, thermally demanding, and EMI-critical automotive body electronics.
Availability
LMS3635MQRNLRQ1 is available at Aetrix Electronics and suitable for automotive USB charging, driver monitoring systems, surround-view ECUs, and mechanically scanning LIDAR applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LMS3635MQRNLRQ1 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 and ISO/TS 16949-certified manufacturing.
The LMS3635MQRNLRQ1 belongs to TI's LMS36x5-Q1 family of high-efficiency, low-EMI synchronous buck converters designed specifically for demanding automotive subsystems including ADAS sensors, infotainment, and body control modules.
FAQ
What is the minimum input voltage required for LMS3635MQRNLRQ1 to start and regulate?
The LMS3635MQRNLRQ1 has a minimum operating input voltage of 3.55 V (rising) and 3.25 V (falling) with 0.3 V hysteresis. It can sustain regulation down to 3.5 V after startup - verified for full functionality at 3.5-A load with 3.3-V output. Below 3.5 V, operation is limited and requires validation per Section 7.7 of the datasheet. The LMS3635MQRNLRQ1 supports extended low-input operation only when configured for adjustable output and using appropriate external components.
Does LMS3635MQRNLRQ1 support spread-spectrum frequency modulation?
Yes, the LMS3635MQRNLRQ1 includes built-in spread-spectrum modulation with ±3% frequency dithering and 1.2-Hz pattern frequency. This feature is enabled by default in the M-suffix variant (as indicated in Table 5-1), reducing peak conducted EMI without requiring external components or layout changes. The LMS3635MQRNLRQ1 does not provide user disable control - spread spectrum is integral to its EMI performance certification.
What is the function of the BIAS pin on LMS3635MQRNLRQ1?
The BIAS pin on the LMS3635MQRNLRQ1 supplies auxiliary bias to the internal control circuitry, reducing quiescent current when connected to the output voltage. For output voltages ≤6 V, BIAS connects directly to VOUT. For extended outputs >15 V, BIAS must be grounded or powered externally (≤16 V). The LMS3635MQRNLRQ1 draws 53–62 µA from BIAS in AUTO mode at no load, contributing to its 18-µA total VIN IQ.
How is the RESET output timed and filtered on LMS3635MQRNLRQ1?
The LMS3635MQRNLRQ1 RESET output features a 24-µs internal glitch filter and a 3-ms release timer after fault clearance. It asserts low during EN deactivation, output undervoltage (<94% VOUT), or thermal shutdown. The LMS3635MQRNLRQ1 RESET remains low for exactly 3 ms after conditions normalize - providing deterministic, RC-free supervision for microcontrollers without external timing components.
Is LMS3635MQRNLRQ1 pin-compatible with other devices in the LMS36x5-Q1 family?
The LMS3635MQRNLRQ1 shares identical 22-pin VQFN (RNL) package, pinout, and footprint with all LMS3635-Q1 and LMS3655-Q1 variants, including LMS36355QRNLRQ1 and LMS3655MQRNLRQ1. However, maximum output current differs (3.5 A vs. 5.5 A), and current-limit thresholds vary - so PCB reuse is mechanically possible but requires validation of thermal design, inductor saturation, and current-sense loop stability for the target load.
LMS3635MQRNLRQ1 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)
LMS3635MQRNLRQ1 FAQ
1.How can I place an order for LMS3635MQRNLRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMS3635MQRNLRQ1 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 LMS3635MQRNLRQ1 reliable?
The price and inventory of LMS3635MQRNLRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMS3635MQRNLRQ1 is usually 5 days.
3.What payment methods are accepted for LMS3635MQRNLRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMS3635MQRNLRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMS3635MQRNLRQ1?
LMS3635MQRNLRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMS3635MQRNLRQ1 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 LMS3635MQRNLRQ1?
For technical support, including LMS3635MQRNLRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMS3635MQRNLRQ1 requirements.
6.How does Aetrix verify that LMS3635MQRNLRQ1 is sourced from the original manufacturer or authorized distributors?
All LMS3635MQRNLRQ1 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 LMS3635MQRNLRQ1 meets industry standards.
7.What is the process for return or replacement of LMS3635MQRNLRQ1?
All LMS3635MQRNLRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMS3635MQRNLRQ1, 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 LMS3635MQRNLRQ1 part is unused and in its original packaging.
Return procedure for LMS3635MQRNLRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMS3635MQRNLRQ1 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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