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Texas Instruments LM53635NQURNLRQ1
- Part No.:
- LM53635NQURNLRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LM53635NQURNLRQ1.pdf
- Description:
- IC REG BUCK 3.3V 3.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
LM53635NQURNLRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck DC-DC converter delivering 3.3 V at up to 3.5 A, operating from 3.9 V to 36 V input with 2.1-MHz fixed switching frequency and spread-spectrum EMI reduction. It integrates high-side/low-side MOSFETs, internal compensation, soft-start, thermal shutdown, and a filtered open-drain RESET output - deployed in instrument clusters and telematics power rails.
For engineers reviewing the LM53635NQURNLRQ1 datasheet, LM53635NQURNLRQ1 pinout, LM53635NQURNLRQ1 application, or LM53635NQURNLRQ1 equivalent, key selection criteria include its 3.3-V fixed output, wettable-flank–free VQFN-HR (22-pin) package, ±1% output voltage tolerance over –40°C to +125°C junction, 15-µA no-load quiescent current, and 3.9-V minimum input for full functionality at 3.5-A load.
Technical Context
The LM53635NQURNLRQ1 employs peak-current-mode control with adaptive off-time spreading to maintain regulation down to 300-mV dropout at 3.5 A while sustaining 2.1-MHz operation across wide VIN–VOUT ratios - enabling 18-V-to-3.3-V conversion without frequency foldback. Its HotRod QFN architecture minimizes parasitic inductance, reducing switch-node ringing and radiated EMI.
It supports external frequency synchronization (1.9–2.3 MHz), pin-selectable forced PWM mode (FPWM), and integrated 3-ms RESET release timer with built-in glitch filtering (12–45 µs). The BIAS pin enables efficient auxiliary biasing from the output, and the device operates with junction temperatures up to +150°C, qualified per AEC-Q100 Grade 1 (–40°C to +125°C ambient).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V, ±1% tolerance over –40°C to +125°C TJ - ensures stable MCU/SOC core rail under automotive thermal stress. |
| Max Output Current | 3.5 A continuous - supports high-power infotainment processors and display drivers without external current boosting. |
| Input Voltage Range | 3.9 V to 36 V, with 42-V transient tolerance ≤500 ms - eliminates need for upstream TVS or active OVP in 12-V/24-V vehicle systems. |
| Switching Frequency | 2.1 MHz nominal (±3% spread-spectrum enabled) - allows use of compact 1–2.2-µH inductors and avoids AM-band interference. |
| Quiescent Current | 15 µA typical at no load (3.3-V output) - enables always-on subsystems (e.g., CAN wake-up logic) without battery drain concerns. |
| Dropout Voltage | 0.6 V at 3.5 A and +105°C TA - sustains regulation during cold-crank (≥6 V) and stop-start cycles with minimal headroom loss. |
| RESET Output | Open-drain with 3-ms release delay and 12–45 µs internal glitch filter - replaces discrete supervisor ICs in ASIL-B–compliant power sequencing. |
| Junction Temp Range | –40°C to +150°C - validated for under-hood placement and meets AEC-Q100 Grade 1 requirements. |
Pinout & Package
LM53635NQURNLRQ1 uses a 5.0-mm × 4.0-mm VQFN-HR (22-pin) package without wettable flanks (per orderable addendum Table 5-2), optimized for low-inductance layout and automated optical solder inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Internal LDO output (3.1 V) | Supplies internal control circuitry; requires 4.7-µF capacitor to AGND for stability. |
| CBOOT | Bootstrap capacitor node | Connects 470-nF ceramic cap to SW; enables high-side gate drive with minimal shoot-through risk. |
| SYNC | External clock input | Accepts 1.9–2.3 MHz system clock (rising-edge triggered); synchronizes switching to reduce beat frequencies. |
| PVIN1 / PVIN2 | Main power inputs | Parallel high-current VIN paths; must be shorted on PCB to minimize loop inductance and thermal imbalance. |
| SW | Switch node | Connects directly to power inductor; critical for EMI control - requires tight layout and ground stitching. |
| PGND1 / PGND2 | Power ground terminals | Eight dedicated GND pins (pins 5–8, 10–13); must tie together and connect to AGND at single point for noise isolation. |
| AVIN | Analog supply reference | Bias source for error amplifier; connects to PVIN net - improves PSRR and load-transient immunity. |
| FPWM | Mode control input | High = forced PWM (constant 2.1 MHz); low = auto PFM/PWM transition - enables deterministic timing in real-time systems. |
| EN | Enable input | Active-high logic (1.7–2.0 V threshold); internal hysteresis prevents chatter during slow-rising battery rails. |
| RESET | Open-drain fault flag | Asserts low on UVLO, thermal shutdown, or EN deactivation; includes internal 3-ms release timer and glitch filter. |
| AGND | Analog ground reference | Reference for FB, BIAS, and internal circuits; must connect to PGND at single star point to avoid ground bounce. |
| FB | Feedback input | Monitors regulated 3.3-V output directly (no divider needed); 1-V reference enables precise output tracking. |
| BIAS | Auxiliary bias input | Connected to output rail to power internal LDO efficiently - reduces losses vs. VIN-based biasing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated HotRod QFN package | Eliminates bond wires to reduce parasitic inductance by >50%, cutting switch-node overshoot and improving EMI margin by ≥6 dB. |
| Spread-spectrum modulation | ±3% frequency dithering lowers peak EMI amplitude by 10 dB without affecting regulation or efficiency. |
| Adaptive off-time spreading | Enables 98% max duty cycle and 300-mV dropout at 3.5 A - maintains regulation during deep cold-crank events (≤6 V). |
| Built-in RESET with filtering | 3-ms release timer and 12–45 µs glitch rejection replace external supervisors - saves 2.5 mm² board area and BOM cost. |
| Low-noise peak-current-mode control | Stable with ceramic output caps as low as 22 µF; insensitive to ESR changes during temperature cycling or aging. |
| 15-µA light-load IQ (3.3 V) | Supports >10-year battery standby in always-on modules (e.g., remote keyless entry receivers) without supplemental LDO. |
Applications
| Instrumentation Cluster Power | Telematics Module Core Rail |
|---|---|
Use Scenario: Supplies 3.3-V domain for digital gauges, CAN transceivers, and microcontrollers in vehicle dashboards exposed to –40°C to +105°C ambient. IC Role / Device Role / Timing Role: Primary 3.5-A buck regulator with integrated RESET for safe boot sequencing and brownout detection. Use Value: Maintains regulation during 6-V cold-crank transients and delivers ±1% accuracy across full automotive temperature range - eliminating need for post-regulator LDOs. |
Use Scenario: Powers LTE/Wi-Fi SoCs and GNSS receivers in connected car gateways requiring ultra-low quiescent current and EMI robustness. IC Role / Device Role / Timing Role: High-efficiency 2.1-MHz buck converter with spread spectrum and SYNC input for coexistence with RF front-ends. Use Value: 15-µA no-load IQ extends battery backup runtime; 2.1-MHz operation avoids AM/FM bands; RESET output enables clean firmware reset on power recovery. |
| Head Unit Audio DSP Supply | ADAS Camera Interface Rail |
Use Scenario: Generates clean 3.3-V supply for audio codecs and DSPs in infotainment head units subject to engine noise coupling and load transients. IC Role / Device Role / Timing Role: Low-EMI synchronous buck with BIAS pin connection to output for improved PSRR and fast transient response. Use Value: HotRod package and optimized layout reduce conducted emissions below CISPR-25 Class 5 limits; 3.5-A capability handles burst audio loads. |
Use Scenario: Provides stable 3.3-V rail for MIPI CSI-2 image sensors and SerDes links in rear-view and surround-view camera ECUs. IC Role / Device Role / Timing Role: Automotive-grade buck with AEC-Q100 qualification and 150°C junction rating for under-hood mounting near camera housings. Use Value: 3.9-V min input ensures operation during alternator ripple (≥8 Vpp); RESET signal validates power integrity before sensor initialization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM53635NQRNLRQ1 | Same electrical specs but with wettable flanks - enables AOI-compatible solder joint inspection. | Preferred where X-ray-free manufacturing validation is required (e.g., Tier-1 production lines). | Select LM53635NQRNLRQ1 if automated optical inspection of solder joints is mandated; otherwise LM53635NQURNLRQ1 offers identical performance with lower assembly cost. |
| TPS54335AQDDARQ1 | 3.5-A, 36-V buck with 2.2-MHz FSW but no spread spectrum, higher 26-µA IQ, and no integrated RESET. | Suitable for cost-sensitive designs where EMI filtering is handled externally and supervisor ICs are already present. | Choose TPS54335AQDDARQ1 only when spread spectrum and RESET integration are non-critical; LM53635NQURNLRQ1 provides superior EMI and system-level integration. |
Compared with LM53635NQRNLRQ1, LM53635NQURNLRQ1 trades wettable flanks for simplified assembly; versus TPS54335AQDDARQ1, it delivers lower EMI, 42% less quiescent current, and eliminates a discrete supervisor - reducing total solution size by ≥30%.
Availability
LM53635NQURNLRQ1 is available at Aetrix Electronics and suitable for automotive instrumentation clusters, telematics gateways, and ADAS camera modules requiring stable component supply with AEC-Q100 compliance and long-term lifecycle support.
Supply support for LM53635NQURNLRQ1 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 ISO/TS 16949-certified manufacturing.
The LM536xx-Q1 product line delivers high-efficiency, low-EMI synchronous buck regulators optimized for automotive infotainment, body electronics, and ADAS power systems - emphasizing AEC-Q100 reliability, thermal robustness, and system-level integration.
FAQ
What is the minimum input voltage required for LM53635NQURNLRQ1 to regulate 3.3 V at full 3.5-A load?
The LM53635NQURNLRQ1 requires a minimum input voltage of 3.9 V to maintain full functionality and ±2%/–3% output regulation at 3.5-A load, as specified in Section 7.6 of the datasheet. Below this, dropout behavior begins - though adaptive off-time spreading allows regulation down to 300 mV dropout (i.e., ~3.6 V input) with reduced switching frequency.
Does LM53635NQURNLRQ1 support external frequency synchronization, and what is the valid input range?
Yes, LM53635NQURNLRQ1 supports external synchronization via the SYNC pin, accepting a 1.9-MHz to 2.3-MHz square wave (rising-edge triggered). This feature enables EMI reduction through frequency alignment with other system clocks and avoids beat frequencies in multi-rail automotive domains.
How does the RESET output of LM53635NQURNLRQ1 behave during startup and fault conditions?
The LM53635NQURNLRQ1 RESET output remains low until the output reaches 105–110% of nominal 3.3 V, then releases high after a fixed 3-ms timer. It asserts low again on EN deactivation, UVLO, or thermal shutdown - with internal 12–45 µs glitch filtering to reject noise-induced false triggers.
What is the purpose of the BIAS pin on LM53635NQURNLRQ1, and how should it be connected?
The BIAS pin on LM53635NQURNLRQ1 supplies the internal LDO from the regulated output rail instead of VIN, improving efficiency and PSRR. For the 3.3-V fixed version, it must be connected directly to the 3.3-V output node - enabling lower quiescent current and faster transient response than VIN-referenced biasing.
Is LM53635NQURNLRQ1 pin-compatible with other members of the LM53625/35-Q1 family?
Yes, all LM53625/35-Q1 variants share identical 22-pin VQFN-HR (RNL) packaging and pinout - including LM53635NQURNLRQ1, LM53635NQRNLRQ1, and LM53625x variants. Functionally, differences are limited to output current rating (2.5 A vs. 3.5 A), output voltage (fixed 3.3 V/5 V or adjustable), and spread-spectrum enablement.
LM53635NQURNLRQ1 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):
- 3.3V
- 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)
LM53635NQURNLRQ1 FAQ
1.How can I place an order for LM53635NQURNLRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM53635NQURNLRQ1 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 LM53635NQURNLRQ1 reliable?
The price and inventory of LM53635NQURNLRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM53635NQURNLRQ1 is usually 5 days.
3.What payment methods are accepted for LM53635NQURNLRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM53635NQURNLRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM53635NQURNLRQ1?
LM53635NQURNLRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM53635NQURNLRQ1 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 LM53635NQURNLRQ1?
For technical support, including LM53635NQURNLRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM53635NQURNLRQ1 requirements.
6.How does Aetrix verify that LM53635NQURNLRQ1 is sourced from the original manufacturer or authorized distributors?
All LM53635NQURNLRQ1 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 LM53635NQURNLRQ1 meets industry standards.
7.What is the process for return or replacement of LM53635NQURNLRQ1?
All LM53635NQURNLRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM53635NQURNLRQ1, 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 LM53635NQURNLRQ1 part is unused and in its original packaging.
Return procedure for LM53635NQURNLRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM53635NQURNLRQ1 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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