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Texas Instruments LM53635NQRNLRQ1
- Part No.:
- LM53635NQRNLRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LM53635NQRNLRQ1.pdf
- Description:
- IC REG BUCK 3.3V 3.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,141
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Product details
Overview
LM53635NQRNLRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck DC-DC converter delivering 3.5-A output at 3.3 V with 2.1-MHz fixed switching frequency, ±1% output voltage tolerance over –40°C to +125°C, and 15-µA quiescent current at no load - optimized for head unit and instrumentation cluster power rails.
For engineers reviewing the LM53635NQRNLRQ1 datasheet, LM53635NQRNLRQ1 pinout, LM53635NQRNLRQ1 application, or LM53635NQRNLRQ1 equivalent, key selection considerations include its 36-V input range with 42-V transient tolerance, spread-spectrum EMI reduction, external frequency synchronization capability, and integrated RESET with 3-ms release timer.
Technical Context
The LM53635NQRNLRQ1 employs peak current-mode control with adaptive frequency spreading to maintain regulation down to 300-mV dropout at 3.5 A while preserving 2.1-MHz operation across wide VIN–VOUT ratios - enabling stable 3.3-V output from as low as 3.55-V input. Its HotRod QFN package minimizes parasitic inductance, reducing switch-node ringing and radiated EMI.
It integrates internal compensation, soft-start, thermal shutdown, UVLO, and a true open-drain RESET output with built-in filtering and 3-ms delay. Pin-selectable forced PWM mode disables light-load diode emulation, ensuring constant 2.1-MHz switching for noise-sensitive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3.5 A continuous - supports high-power automotive SoCs and display drivers without external current boosting. |
| Input Voltage Range | 3.55 V to 36 V - accommodates cold-crank (≥3.55 V) and load-dump (≤42 V transient) conditions per ISO 7637-2. |
| Switching Frequency | 2.1 MHz nominal - enables compact 2.2-µH inductors and avoids AM-band interference. |
| Quiescent Current | 15 µA typical at 3.3-V output, no load - extends battery life in always-on telematics modules. |
| Output Voltage Accuracy | ±1% over –40°C to +125°C junction - ensures reliable microcontroller and sensor rail stability. |
| Dropout Voltage | 0.6 V at 3.5 A, 105°C ambient - maintains regulation during low-input transients in vehicle stop-start systems. |
| RESET Delay | 3 ms release time - provides clean, glitch-free system reset signaling after power-up or fault recovery. |
Pinout & Package
LM53635NQRNLRQ1 uses a 5.0-mm × 4.0-mm VQFN-HR (RNL) package with 22 pins and wettable flanks for automated optical solder-joint inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Internal LDO output | Supplies internal control circuitry; requires 4.7-µF capacitor to AGND for stability. |
| CBOOT | Bootstrap capacitor node | Drives high-side MOSFET gate; connects via 470-nF capacitor to SW for proper gate drive. |
| SYNC | Frequency synchronization input | Accepts 1.9–2.3 MHz external clock (rising-edge triggered); enables system-level timing alignment. |
| PVIN1 / PVIN2 | Main power inputs | Parallel-connected VIN paths reduce IR drop and thermal stress; bypass directly to PGND. |
| SW | Switch node | Connects to power inductor; exhibits low ringing due to HotRod packaging and minimized loop inductance. |
| PGND1 / PGND2 | Power ground terminals | Eight dedicated ground pins minimize ground bounce; must be tied together and connected to AGND. |
| FB | Feedback input | Directly connected to 3.3-V output (fixed version); no external divider required. |
| EN | Enable input | Active-high logic; threshold 1.7–2.0 V; hysteresis ensures noise immunity during supply ramp. |
| RESET | Open-drain status flag | Asserts low on fault or EN deactivation; includes internal 12–45 µs glitch filter and 3-ms release timer. |
| FPWM | Forced PWM mode control | High = constant 2.1-MHz switching; prevents frequency modulation in EMI-sensitive zones. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation - meets automotive cabin and engine-bay thermal requirements. |
| Integrated RESET with timing | Eliminates external supervisor IC; 3-ms release ensures deterministic boot sequencing for MCU-based clusters. |
| Spread-spectrum modulation | Reduces peak EMI by ±3% frequency dithering - simplifies compliance with CISPR 25 Class 5 limits. |
| Low-noise HotRod QFN | Flip-chip construction cuts switch-node parasitics - measured overshoot <1.2× VOUT under 3.5-A load steps. |
| Built-in soft-start | 3.2-ms internal ramp - prevents inrush current and output voltage overshoot during cold-start. |
| Thermal shutdown protection | 155°C trip with 15°C hysteresis - safeguards against sustained overload or poor heatsinking in sealed enclosures. |
Applications
| Telematics Module Power | Head Unit Core Rail |
|---|---|
Use Scenario: Powers LTE modem, GNSS receiver, and CAN transceiver in automotive telematics control units during ignition-off monitoring. IC Role / Device Role / Timing Role: Primary 3.3-V buck regulator supplying low-noise, always-on domain with ultra-low IQ. Use Value: 15-µA quiescent current extends battery hold-up time beyond 30 days without recharge - critical for remote diagnostics. |
Use Scenario: Delivers stable 3.3-V supply to infotainment SoC, audio codec, and touch controller in central display units. IC Role / Device Role / Timing Role: High-current, low-EMI point-of-load regulator synchronized to system clock via SYNC pin. Use Value: 2.1-MHz switching and spread spectrum meet stringent CISPR 25 radiated emissions limits without added shielding. |
| Instrumentation Cluster Display | ADAS Camera Interface Power |
Use Scenario: Supplies 3.3-V rail to TFT-LCD driver, microcontroller, and backlight LED controller in digital instrument clusters. IC Role / Device Role / Timing Role: Automotive-grade buck converter with RESET output used for MCU watchdog and boot validation. Use Value: Integrated RESET with 3-ms release replaces discrete RC reset circuit - reduces BOM count and improves startup reliability. |
Use Scenario: Powers image signal processor and serializer in rear-view or surround-view camera modules exposed to engine bay temperatures. IC Role / Device Role / Timing Role: High-temperature capable buck regulator operating up to +150°C junction temperature. Use Value: 0.6-V dropout at 3.5 A and 105°C ambient ensures uninterrupted operation during hot-soak conditions post-engine shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM53635MQRNLRQ1 | Same 3.3-V fixed output and 3.5-A rating, but includes spread-spectrum enabled by default (no FPWM pin override needed). | Preferred where EMI reduction is mandatory and forced PWM mode is not required. | Select LM53635MQRNLRQ1 if spread-spectrum is always desired; LM53635NQRNLRQ1 offers FPWM flexibility. |
| TPS54335AQDDARQ1 | 3.5-A, 36-V input, but 500-kHz max switching frequency; lacks integrated RESET and spread-spectrum. | Suitable for cost-sensitive designs where board space is less constrained and EMI filtering can be added externally. | Choose TPS54335AQDDARQ1 only when lower frequency simplifies magnetics design and RESET is implemented separately. |
Compared with LM53635MQRNLRQ1 and TPS54335AQDDARQ1, LM53635NQRNLRQ1 uniquely balances programmable EMI control (via FPWM), automotive-grade reliability, and integrated system supervision - making it optimal for space-constrained, safety-aware domains like digital clusters and telematics.
Availability
LM53635NQRNLRQ1 is available at Aetrix Electronics and suitable for automotive telematics, head unit power management, and instrumentation cluster applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LM53635NQRNLRQ1 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 electronics, with decades of automotive qualification expertise and broad power management portfolio.
LM53635NQRNLRQ1 belongs to TI's automotive-qualified DC-DC converter family designed specifically for demanding vehicle subsystems - emphasizing low EMI, high thermal resilience, and functional safety readiness.
FAQ
What is the maximum input voltage transient the LM53635NQRNLRQ1 can withstand?
The LM53635NQRNLRQ1 supports input transients up to 42 V for ≤500 ms at ≤0.01% duty cycle, per absolute maximum ratings. This enables robust operation during ISO 7637-2 pulse 5a/b load-dump events without external TVS clamping in many implementations - though system-level validation is recommended for specific harness configurations.
Does the LM53635NQRNLRQ1 require external compensation components?
No, the LM53635NQRNLRQ1 features fully integrated compensation - no external Type II or III compensation network is needed. Its internal error amplifier and PWM modulator are factory-tuned for stability with standard 2.2-µH inductors and ceramic output capacitors, reducing design complexity and BOM count.
How does the RESET output of the LM53635NQRNLRQ1 behave during startup?
The LM53635NQRNLRQ1 RESET output remains low until the output reaches 96% of nominal 3.3 V and remains stable for ≥3 ms, then transitions high. It asserts low again if EN is pulled low or if output drops below 92% VOUT - providing precise, filtered power-good signaling for MCU boot sequencing and fault detection.
Can the LM53635NQRNLRQ1 operate with input voltage below 3.9 V?
Yes - the LM53635NQRNLRQ1 supports minimum input voltage of 3.55 V for full functionality at 3.5-A load (per Section 7.6), enabling operation during cold-crank conditions. However, below 3.9 V, switching frequency may decrease and dropout behavior activates to maintain regulation, as confirmed in the datasheet's VIN-MIN specifications.
Is the LM53635NQRNLRQ1 pin-compatible with other devices in the LM536xx-Q1 family?
LM53635NQRNLRQ1 shares identical 22-pin VQFN-HR (RNL) package and pinout with all LM53625/35-Q1 variants, including LM536353QRNLRQ1 and LM53635MQRNLRQ1. This allows direct PCB reuse across 3.3-V fixed-output versions - differing only in spread-spectrum enable state and current limit calibration.
LM53635NQRNLRQ1 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)
LM53635NQRNLRQ1 FAQ
1.How can I place an order for LM53635NQRNLRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM53635NQRNLRQ1 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 LM53635NQRNLRQ1 reliable?
The price and inventory of LM53635NQRNLRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM53635NQRNLRQ1 is usually 5 days.
3.What payment methods are accepted for LM53635NQRNLRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM53635NQRNLRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM53635NQRNLRQ1?
LM53635NQRNLRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM53635NQRNLRQ1 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 LM53635NQRNLRQ1?
For technical support, including LM53635NQRNLRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM53635NQRNLRQ1 requirements.
6.How does Aetrix verify that LM53635NQRNLRQ1 is sourced from the original manufacturer or authorized distributors?
All LM53635NQRNLRQ1 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 LM53635NQRNLRQ1 meets industry standards.
7.What is the process for return or replacement of LM53635NQRNLRQ1?
All LM53635NQRNLRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM53635NQRNLRQ1, 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 LM53635NQRNLRQ1 part is unused and in its original packaging.
Return procedure for LM53635NQRNLRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM53635NQRNLRQ1 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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