My Inquiry
My Account
Texas Instruments LMS3635MQURNLRQ1
- Part No.:
- LMS3635MQURNLRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LMS3635MQURNLRQ1.pdf
- Description:
- IC REG BUCK ADJ 3.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LMS3635MQURNLRQ1 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), operating from 3.5 V to 36 V input with 400-kHz fixed switching frequency and spread-spectrum modulation. It integrates high-side/low-side MOSFETs, internal compensation, soft-start, thermal shutdown, and a filtered open-drain RESET output - deployed in driver monitoring ECUs and surround-view systems requiring robust, low-EMI 5-V or 3.3-V rail generation.
For engineers reviewing the LMS3635MQURNLRQ1 datasheet, LMS3635MQURNLRQ1 pinout, LMS3635MQURNLRQ1 application, or LMS3635MQURNLRQ1 equivalent, key selection criteria include its 3.5-A continuous output capability, ±1.5% reference tolerance, 18-µA quiescent current at 3.3 VOUT, 0.35-V dropout at 3.5 A, and AEC-Q100 qualification for under-hood automotive use.
Technical Context
The LMS3635MQURNLRQ1 employs peak-current-mode control with integrated gate drivers and flip-chip VQFN packaging to minimize parasitic inductance and switch-node ringing. Its frequency foldback architecture enables regulation down to 3.5-V input while maintaining 400-kHz operation across 3.9–36-V input range.
It features automatic light-load PFM/PWM transition, pin-selectable forced PWM mode via FPWM input, and a dedicated BIAS pin supporting extended output voltage range (up to 20 V) when externally powered or grounded. The RESET output includes 24-µs glitch filtering and 3-ms release timer, eliminating need for external supervisory ICs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3.5 A continuous - supports compact power stages for mid-power automotive ECUs without external current boosting. |
| Input Voltage Range | 3.5 V to 36 V - accommodates cold-crank (≥3.5 V) and load-dump (≤42 V transient) conditions per ISO 7637-2. |
| Switching Frequency | 400 kHz ±10% - enables use of small 2.2-µH inductors and reduces EMI filter size in space-constrained modules. |
| Quiescent Current | 18 µA at 3.3 VOUT, no load - extends battery runtime in always-on vehicle subsystems (e.g., driver monitoring). |
| Reference Tolerance | ±1.5% over –40°C to +125°C ambient - ensures stable 3.3-V/5-V rail accuracy across full automotive temperature range. |
| Dropout Voltage | 0.35 V at 3.5 A, 25°C - maintains regulation during low-input transients (e.g., engine start) without sacrificing efficiency. |
| RESET Delay | 3 ms release time with internal filtering - provides clean, bounce-free system reset signaling after power-up or fault recovery. |
Pinout & Package
Package: SON (RNL), 22-pin VQFN, 4.00 mm × 5.00 mm body size, non-wettable flanks - optimized for automated optical inspection (AOI) and thermal performance on 4-layer PCBs (RθJA = 29.4°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VCC | Internal LDO output | Supplies internal control circuitry; requires 4.7-µF capacitor to AGND for stability. |
| 2 CBOOT | Bootstrap capacitor node | Drives high-side MOSFET gate; connects to SW via 470-nF ceramic capacitor. |
| 3 SYNC | Frequency synchronization input | Accepts 250–500-kHz external clock (rising-edge triggered); enables system-level timing coordination. |
| 4,14 PVIN1/PVIN2 | Main power inputs | Parallel input paths for low-impedance VIN routing; must be shorted together on PCB. |
| 5,10 PGND1/PGND2 | Power ground terminals | Low-inductance return for internal MOSFETs; tied directly to AGND and system ground. |
| 9 SW | Switch node | Connects to power inductor; high dv/dt node requiring tight layout and minimal trace length. |
| 15 AVIN | Analog supply input | Bias source for analog circuits; connected to PVIN on PCB for noise isolation. |
| 16 FPWM | Mode control input | High = forced PWM (no PFM), low = automatic light-load mode; must not float. |
| 18 EN | Enable input | Active-high logic control; internal hysteresis (0.5 V) prevents chatter during slow-rising VIN. |
| 19 RESET | Open-drain reset flag | Asserts low on fault or EN deactivation; requires external pull-up; 3-ms release ensures clean boot sequencing. |
| 20 AGND | Analog ground reference | Star-ground point for FB, BIAS, and internal references; isolated from PGND except at single PCB tie-point. |
| 21 FB | Feedback input | Connects to resistor divider for adjustable output; 1-V reference enables 1–20-V range with ±1.5% accuracy. |
| 22 BIAS | Auxiliary bias regulator input | Extends output range to 20 V when grounded or supplied externally; limits max BIAS voltage to 16 V. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with HBM ±2.5 kV / CDM ±1 kV ESD robustness - meets automotive reliability requirements. |
| Spread-spectrum modulation | ±3% frequency dithering reduces peak conducted EMI by >10 dB, easing CISPR 25 Class 5 compliance without added shielding. |
| Integrated RESET with filtering | 24-µs glitch rejection and 3-ms release timer eliminate need for discrete supervisor IC, saving board area and BOM cost. |
| Low quiescent current (18 µA) | Enables direct connection to battery without external load switch - critical for always-on ADAS subsystems with <100-µA sleep budgets. |
| Flip-chip VQFN packaging | Minimizes switch-node loop inductance and magnetic field coupling, reducing radiated emissions and improving transient response. |
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 load-dump immunity. IC Role / Device Role / Timing Role: Primary 5-V buck regulator supplying USB PD controller and port power switches. Use Value: 94% efficiency at 13.5 V → 5 V / 3.5 A eliminates heatsink; spread spectrum meets OEM EMI targets without ferrite beads. |
Use Scenario: Generating stable 3.3-V rail for CMOS image sensor, ISP, and low-power MCU in cabin-facing camera module. IC Role / Device Role / Timing Role: Always-on power stage enabling wake-on-motion with <20-µA quiescent draw. Use Value: 18-µA IQ_VIN extends battery hold-up time; RESET signal synchronizes sensor initialization with power-good assertion. |
| Surround-View ECU | Mechanically Scanning LIDAR |
Use Scenario: Supplying 5-V and 3.3-V rails to four camera interfaces and FPGA-based stitching engine in 360° video processing unit. IC Role / Device Role / Timing Role: Dual-output capable regulator (via multiple LMS3635MQURNLRQ1 units) delivering isolated, low-noise power domains. Use Value: 400-kHz fixed frequency allows synchronized switching across multiple converters to avoid beat frequencies in sensitive video ADCs. |
Use Scenario: Providing regulated 5-V supply to laser diode driver and 3.3-V supply to position encoder ASIC in rotating LIDAR head. IC Role / Device Role / Timing Role: High-reliability DC-DC stage operating in high-vibration, wide-temperature mechanical assembly. Use Value: AEC-Q100 qualification and 150°C junction rating ensure functional safety compliance; low EMI preserves analog signal integrity. |
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 to 36-V input, 2.1-MHz switching, no spread spectrum, higher IQ (26 µA) | Better suited for space-constrained designs needing higher current density; lacks built-in RESET and spread-spectrum EMI reduction | Select when board area is critical and EMI filtering can be handled externally; verify thermal design for 5.5-A loads. |
| TPS543B20RSAR | 3-A output, 4.5–20-V input, 500-kHz to 2.2-MHz programmable frequency, PMBus interface, no AEC-Q100 | Targeted at industrial/compute applications with digital control needs; lacks automotive qualification and integrated RESET | Choose only for non-automotive designs requiring telemetry or dynamic voltage scaling; not suitable for safety-critical vehicle systems. |
Compared with LM61480QRNLRQ1 and TPS543B20RSAR, the LMS3635MQURNLRQ1 offers unique integration of automotive qualification, spread-spectrum EMI suppression, and a filtered RESET output - making it optimal for cost-sensitive, EMI-regulated automotive ECUs where external supervision and discrete EMI filters must be avoided.
Availability
LMS3635MQURNLRQ1 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 LMS3635MQURNLRQ1 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 manufacturing scale.
The LMS3635MQURNLRQ1 belongs to TI's LMS36x5-Q1 family of high-efficiency, low-EMI synchronous buck converters designed specifically for demanding automotive ADAS and infotainment subsystems requiring robust, integrated, and qualification-ready power solutions.
FAQ
What is the maximum input voltage the LMS3635MQURNLRQ1 can withstand during transients?
The LMS3635MQURNLRQ1 supports 42-V transient tolerance on VIN pins for ≤500 ms at ≤0.01% duty cycle, meeting ISO 7637-2 Pulse 5a requirements for automotive load-dump protection without external TVS diodes - simplifying front-end protection design in ECU power supplies.
Does the LMS3635MQURNLRQ1 require external compensation components?
No, the LMS3635MQURNLRQ1 features built-in compensation, eliminating the need for external RC networks. This reduces design complexity, saves PCB area, and ensures stable operation across all supported output voltages (3.3 V, 5 V, or adjustable 1–20 V) with standard 2.2-µH inductors and 22-µF output capacitors.
How does the spread-spectrum feature of the LMS3635MQURNLRQ1 improve EMI performance?
The LMS3635MQURNLRQ1 applies ±3% frequency dithering around its 400-kHz center frequency, spreading energy across a wider bandwidth and reducing peak conducted and radiated emissions by >10 dB - enabling easier CISPR 25 Class 5 compliance without additional EMI filters or shielding in automotive modules.
Can the LMS3635MQURNLRQ1 operate with an input voltage below 3.9 V?
Yes - the LMS3635MQURNLRQ1 supports minimum input of 3.5 V after startup (verified at 3.5-A load), enabling reliable operation during cold-crank conditions. Startup requires ≥3.9 V, but once running, it sustains regulation down to 3.5 V, critical for engine-start scenarios in driver monitoring and surround-view systems.
What is the function of the BIAS pin on the LMS3635MQURNLRQ1?
The BIAS pin on the LMS3635MQURNLRQ1 powers an auxiliary regulator that extends the adjustable output range to 20 V. When the output exceeds 15 V, BIAS must be grounded or supplied externally (≤16 V); this pin enables high-voltage rails for sensors or actuators while maintaining regulation accuracy and thermal safety.
LMS3635MQURNLRQ1 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):
- 3.3V
- Voltage - Output (Max):
- 10V
- 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)
LMS3635MQURNLRQ1 FAQ
1.How can I place an order for LMS3635MQURNLRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMS3635MQURNLRQ1 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 LMS3635MQURNLRQ1 reliable?
The price and inventory of LMS3635MQURNLRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMS3635MQURNLRQ1 is usually 5 days.
3.What payment methods are accepted for LMS3635MQURNLRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMS3635MQURNLRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMS3635MQURNLRQ1?
LMS3635MQURNLRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMS3635MQURNLRQ1 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 LMS3635MQURNLRQ1?
For technical support, including LMS3635MQURNLRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMS3635MQURNLRQ1 requirements.
6.How does Aetrix verify that LMS3635MQURNLRQ1 is sourced from the original manufacturer or authorized distributors?
All LMS3635MQURNLRQ1 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 LMS3635MQURNLRQ1 meets industry standards.
7.What is the process for return or replacement of LMS3635MQURNLRQ1?
All LMS3635MQURNLRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMS3635MQURNLRQ1, 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 LMS3635MQURNLRQ1 part is unused and in its original packaging.
Return procedure for LMS3635MQURNLRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMS3635MQURNLRQ1 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
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
