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Texas Instruments LM53625NQURNLRQ1
- Part No.:
- LM53625NQURNLRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LM53625NQURNLRQ1.pdf
- Description:
- IC REG BUCK 3.3V 2.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
LM53625NQURNLRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck DC-DC converter delivering 3.3 V at up to 2.5 A, operating from 3.55 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 systems requiring robust 12-V rail regulation.
For engineers reviewing the LM53625NQURNLRQ1 datasheet, LM53625NQURNLRQ1 pinout, LM53625NQURNLRQ1 application, or LM53625NQURNLRQ1 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 3.55-V minimum start-up input voltage enabling operation near battery dropout.
Technical Context
The LM53625NQURNLRQ1 employs peak-current-mode control with adaptive off-time extension and smooth frequency spreading to maintain regulation down to 300-mV input-to-output differential at 3.5 A, achieving 98% duty cycle without external components. Its flip-chip 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 features an integrated 3.1-V LDO (VCC) for internal circuitry, BIAS pin for auxiliary biasing, and a 3-ms release-timer RESET output with built-in glitch filtering (12–45 µs).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±1% over –40°C to +125°C TJ - ensures stable MCU/SOC core rail without external feedback divider. |
| Max Output Current | 2.5 A continuous - sufficient for automotive display controllers and audio amplifiers with transient headroom. |
| Input Voltage Range | 3.55 V to 36 V - supports cold-crank (≥3.55 V start-up) and load-dump (42 V transient tolerant) per ISO 7637-2. |
| Switching Frequency | 2.1 MHz nominal, ±3% spread spectrum - enables compact 2.2-µH inductors and avoids AM-band interference. |
| Quiescent Current | 15 µA typical at no load (3.3-V output) - extends battery life in always-on telematics modules. |
| RESET Output | Open-drain with 3-ms release timer and 12–45 µs glitch filter - replaces discrete supervisor IC in safety-critical clusters. |
| Junction Temp Range | –40°C to +150°C - qualified for under-hood placement per AEC-Q100 Grade 1 ambient (–40°C to +125°C). |
Pinout & Package
LM53625NQURNLRQ1 uses a 5.0-mm × 4.0-mm VQFN-HR (22-pin) package without wettable flanks (per Device Comparison Table 5-1). Thermal resistance: RθJA = 29.4°C/W, RθJC(bot) = 2.4°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Internal 3.1-V LDO output | Power source for control logic; requires 4.7-µF capacitor to AGND for stability. |
| CBOOT (Pin 2) | Bootstrap capacitor node | Connects 470-nF capacitor to SW to drive high-side MOSFET gate above VIN. |
| SYNC (Pin 3) | Frequency sync input | Accepts 1.9–2.3 MHz external clock (rising-edge triggered); enables system-level timing alignment. |
| PVIN1/PVIN2 (Pins 4,14) | Main power input | Dual high-current VIN pins - must be shorted on PCB to minimize loop inductance and EMI. |
| SW (Pin 9) | Switch node | Connects directly to power inductor; critical for minimizing trace length to reduce ringing and EMI. |
| PGND1/PGND2 (Pins 5–8,10–13) | Power ground return | Eight dedicated PGND pins - tie all together and connect to AGND/system ground at single point. |
| EN (Pin 18) | Enable input | Active-high (1.7–2.0 V threshold); internal hysteresis prevents chatter during slow-rising battery rails. |
| RESET (Pin 19) | Open-drain fault flag | Asserts low on UVLO, thermal shutdown, or EN deactivation; includes 3-ms release timer and internal filter. |
| FB (Pin 21) | Feedback input | Internally connected to 3.3-V reference; no external divider required for fixed-output configuration. |
| BIAS (Pin 22) | Auxiliary bias supply | Connected to output rail to improve light-load efficiency and enable fast transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Spread-spectrum EMI reduction | ±3% frequency dithering - lowers peak radiated emissions by >10 dB without adding filters or shielding. |
| Low-noise HotRod QFN packaging | Flip-chip construction with minimized bond-wire inductance - reduces switch-node overshoot and improves efficiency. |
| Integrated RESET with timing | 3-ms release delay and 12–45 µs glitch filter - eliminates need for external RC network or supervisor IC. |
| Pin-selectable forced PWM | FPWM pin (Pin 16) disables diode emulation - maintains constant 2.1-MHz switching for noise-sensitive ADCs or clocks. |
| Ultra-low quiescent current | 15 µA typical at no load (3.3-V output) - meets automotive "always-on" module requirements without secondary LDO. |
Applications
| Instrumentation Cluster | Telematics Control Unit |
|---|---|
Use Scenario: Powering digital gauges, TFT LCD drivers, and CAN transceivers in vehicle dashboards exposed to wide temperature swings and vibration. IC Role / Device Role / Timing Role: Primary 3.3-V buck regulator supplying microcontroller, display interface, and sensor signal chain. Use Value: AEC-Q100 Grade 1 qualification and 150°C max junction temperature ensure reliability during extended under-hood operation. |
Use Scenario: Regulating power for GPS/GNSS receivers, cellular modems, and Wi-Fi SoCs in connected car gateways. IC Role / Device Role / Timing Role: High-efficiency 3.3-V supply with low EMI to avoid interference with RF front-end sensitivity. Use Value: Spread-spectrum operation and optimized HotRod layout reduce conducted/radiated emissions below CISPR 25 Class 5 limits. |
| Head Unit Audio Subsystem | ADAS Camera Power Module |
Use Scenario: Delivering clean, low-noise 3.3-V power to DSPs, audio codecs, and amplifier bias rails in infotainment head units. IC Role / Device Role / Timing Role: Fixed-output buck converter with forced PWM mode to eliminate audible switching noise in audio band. Use Value: Pin-selectable FPWM maintains constant 2.1-MHz operation - avoids beat frequencies with audio sampling clocks. |
Use Scenario: Providing regulated 3.3-V supply to image sensors and ISP processors in rear-view or surround-view cameras. IC Role / Device Role / Timing Role: Compact, thermally robust DC-DC stage placed near camera module PCB for minimal voltage drop. Use Value: 5.0-mm × 4.0-mm VQFN-HR package with RθJB = 5.4°C/W enables direct mounting on heat-spreading copper layers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM536253QRNLRQ1 | Same 3.3-V fixed output, 2.5-A rating, and VQFN-HR package but includes wettable flanks for automated optical inspection. | Preferred where solder-joint inspection via AOI (not X-ray) is mandated in high-reliability automotive production. | Select LM536253QRNLRQ1 if board assembly requires wettable flanks; otherwise LM53625NQURNLRQ1 offers identical electrical performance with lower cost. |
| LM53635NQURNLRQ1 | 3.5-A rated version with identical pinout, 3.3-V output, spread spectrum, and package - higher current capability and elevated current limits (IL-HS = 4.5–6 A). | Suitable for future-proofing designs expecting increased load current or requiring margin for thermal derating in sealed enclosures. | Choose LM53635NQURNLRQ1 only if sustained >2.5 A load or tighter thermal constraints demand extra headroom; LM53625NQURNLRQ1 is optimal for cost-sensitive 2.5-A use cases. |
Compared with LM536253QRNLRQ1, LM53625NQURNLRQ1 omits wettable flanks but retains full electrical compatibility and AEC-Q100 qualification; compared with LM53635NQURNLRQ1, it delivers matched functionality at lower current rating and reduced conduction loss in typical 2.5-A applications.
Availability
LM53625NQURNLRQ1 is available at Aetrix Electronics and suitable for automotive instrumentation clusters, telematics control units, and head unit subsystems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LM53625NQURNLRQ1 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 AEC-Q100 portfolio coverage.
The LM53625-Q1 belongs to TI's automotive-qualified DC-DC converter family designed specifically for demanding 12-V battery rail applications - emphasizing low EMI, high efficiency at light loads, and robust operation across –40°C to +150°C junction temperatures.
FAQ
What is the minimum input voltage required for LM53625NQURNLRQ1 to start and regulate a 3.3-V output?
The LM53625NQURNLRQ1 has a rising UVLO threshold of 3.2 V to 3.55 V, with a typical start-up voltage of 3.55 V. It can maintain regulation down to 3.5 V input at 1.5 A load and 3.9 V at full 2.5-A load - enabling reliable operation during automotive cold-crank events where battery voltage dips to ~6 V but local rail may sag further due to wiring impedance. The LM53625NQURNLRQ1 datasheet specifies this behavior in Section 7.3 and 7.6.
Does LM53625NQURNLRQ1 require external compensation components?
No, LM53625NQURNLRQ1 features fully integrated compensation - no external RC network or type-II/type-III compensator is needed. Its peak-current-mode architecture with built-in error amplifier and PWM comparator eliminates the need for external compensation components, reducing BOM count and layout complexity while ensuring stability across all recommended output capacitors (including ceramic and polymer types).
How does the RESET output of LM53625NQURNLRQ1 behave during startup and fault conditions?
The LM53625NQURNLRQ1 RESET output is an open-drain signal that remains low until the output reaches 96% of nominal 3.3 V and stays within regulation for ≥3 ms. It asserts low again during UVLO, thermal shutdown, or when EN is pulled low. Internal 12–45 µs glitch filtering prevents false resets from noise, and the 3-ms release timer ensures clean system power sequencing - all without external timing components.
Can LM53625NQURNLRQ1 synchronize to an external clock, and what is the acceptable frequency range?
Yes, LM53625NQURNLRQ1 supports external synchronization via the SYNC pin (Pin 3), accepting a clean CMOS clock with 25–75% duty cycle in the 1.9 MHz to 2.3 MHz range. This allows alignment with system master clocks to avoid beat frequencies and simplify EMI filtering - critical in multi-rail automotive ECUs where multiple switchers operate concurrently.
What is the thermal performance difference between LM53625NQURNLRQ1 and versions with wettable flanks?
Thermal performance is identical: LM53625NQURNLRQ1 (no wettable flanks) and LM536253QRNLRQ1 (with wettable flanks) share the same VQFN-HR package outline, die attach, and thermal path. Both exhibit RθJA = 29.4°C/W and RθJB = 5.4°C/W. Wettable flanks affect only solder-joint inspection capability - not thermal resistance, electrical performance, or reliability.
LM53625NQURNLRQ1 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:
- 2.5A
- 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)
LM53625NQURNLRQ1 FAQ
1.How can I place an order for LM53625NQURNLRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM53625NQURNLRQ1 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 LM53625NQURNLRQ1 reliable?
The price and inventory of LM53625NQURNLRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM53625NQURNLRQ1 is usually 5 days.
3.What payment methods are accepted for LM53625NQURNLRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM53625NQURNLRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM53625NQURNLRQ1?
LM53625NQURNLRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM53625NQURNLRQ1 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 LM53625NQURNLRQ1?
For technical support, including LM53625NQURNLRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM53625NQURNLRQ1 requirements.
6.How does Aetrix verify that LM53625NQURNLRQ1 is sourced from the original manufacturer or authorized distributors?
All LM53625NQURNLRQ1 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 LM53625NQURNLRQ1 meets industry standards.
7.What is the process for return or replacement of LM53625NQURNLRQ1?
All LM53625NQURNLRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM53625NQURNLRQ1, 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 LM53625NQURNLRQ1 part is unused and in its original packaging.
Return procedure for LM53625NQURNLRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM53625NQURNLRQ1 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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