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Texas Instruments LM53625NQRNLTQ1
- Part No.:
- LM53625NQRNLTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LM53625NQRNLTQ1.pdf
- Description:
- IC REG BUCK 3.3V 2.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:250
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Product details
Overview
LM53625NQRNLTQ1 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, ±1% output voltage accuracy over –40°C to +125°C, and integrated spread-spectrum EMI reduction - used in automotive head units for stable 3.3-V rail generation under cold-crank conditions.
For engineers reviewing the LM53625NQRNLTQ1 datasheet, LM53625NQRNLTQ1 pinout, LM53625NQRNLTQ1 application, or LM53625NQRNLTQ1 equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade thermal and ESD specs, and real-world design implications for telematics and instrumentation cluster power systems.
Technical Context
The LM53625NQRNLTQ1 implements peak-current-mode control with adaptive off-time spreading to sustain regulation down to 300-mV dropout at 2.5 A while maintaining 2.1-MHz operation above 3.9 V input; its HotRod QFN package minimizes switch-node ringing via reduced parasitic inductance and enables wettable-flank solder inspection.
It integrates a 3.1-V internal LDO (VCC), bootstrap gate drive (CBOOT), open-drain RESET with 3-ms release timer and built-in glitch filtering, and supports external synchronization (SYNC) between 1.9–2.3 MHz - all optimized for automotive transient immunity (42-V/500-ms surge tolerance) and junction temperatures up to +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V, ±1% accuracy over –40°C to +125°C junction temperature - ensures stable MCU/SOC core rail without external feedback divider. |
| Max Output Current | 2.5 A continuous - sufficient for automotive infotainment SoCs and display controllers with dynamic load steps. |
| Input Voltage Range | 3.55 V to 36 V, with 42-V/500-ms surge tolerance - supports cold-crank (4.5 V) and load-dump (36–42 V) automotive transients without external protection. |
| Switching Frequency | 2.1 MHz nominal, ±3% spread-spectrum option - places fundamental and harmonics above AM band (1.8 MHz), reducing EMI filter size and cost. |
| Quiescent Current | 15 µA typical at no load (3.3-V output) - eliminates need for backup LDO in always-on vehicle modules. |
| Junction Temp Range | –40°C to +150°C - qualified per AEC-Q100 Grade 1 (–40°C to +125°C ambient), enabling under-hood and dashboard deployment. |
| Package | VQFN-HR (22-pin), 5.0 mm × 4.0 mm with wettable flanks - enables automated optical solder-joint inspection and improves thermal resistance (RθJB = 5.4°C/W). |
Pinout & Package
VQFN-HR (22-pin) package with 0.6-mm pin pitch, 5.0 mm × 4.0 mm body, exposed thermal pad, and wettable flanks for solder inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Internal LDO output | Supplies 3.1 V to internal control circuits; requires 4.7-µF capacitor to AGND for stability and noise suppression. |
| CBOOT (Pin 2) | Bootstrap capacitor node | Connects 470-nF ceramic capacitor to SW to drive high-side MOSFET gate; critical for efficient 100% duty-cycle operation near dropout. |
| SYNC (Pin 3) | Frequency synchronization input | Accepts 1.9–2.3 MHz external clock (rising-edge triggered); enables system-level EMI alignment across multiple converters. |
| PVIN1/PVIN2 (Pins 4,14) | Main power input | Dual high-current VIN pins - must be shorted on PCB to minimize loop inductance and reduce input ripple and EMI. |
| SW (Pin 9) | Switch node | Connects directly to power inductor; low-parasitic HotRod layout minimizes ringing and radiated emissions. |
| PGND1/PGND2 (Pins 5–8,10–13) | Power ground return | Eight dedicated PGND pins - must be tied together and connected to AGND/system ground at single point to separate power and analog return paths. |
| FB (Pin 21) | Feedback input | Internally connected to 3.3-V reference for fixed-output version; no external resistor divider required - saves board space and leakage current. |
| RESET (Pin 19) | Open-drain fault indicator | Asserts low during UVLO, thermal shutdown, or EN deactivation; includes 3-ms release timer and 12–45 µs glitch filter - replaces discrete supervisor IC. |
| EN (Pin 18) | Enable control | Active-high logic input (1.7–2.0 V threshold); can be tied to VIN for always-on operation; hysteresis prevents chatter during slow-rising supplies. |
| FPWM (Pin 16) | Forced PWM mode select | High = fixed 2.1-MHz switching regardless of load; low = automatic light-load diode emulation - enables deterministic EMI vs. efficiency trade-off. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with HBM ±2500 V and CDM ±1000 V ESD robustness - meets automotive electronics reliability requirements. |
| Integrated spread-spectrum modulation | Reduces peak EMI by >10 dB across 100 kHz–1 GHz range without external components - simplifies CISPR-25 Class 5 compliance in head unit designs. |
| Low dropout operation | Maintains 3.3-V regulation with only 300-mV input-to-output differential at 2.5 A - enables operation during deep battery sag (e.g., engine cranking at 6 V). |
| Built-in RESET with timing control | Provides system-ready signal with 3-ms delay after startup and 12–45 µs glitch rejection - eliminates need for external RC timing network or supervisor IC. |
| HotRod QFN with wettable flanks | Reduces switch-node parasitic inductance by >50% vs. standard QFN; enables visual solder-joint inspection - improves manufacturing yield and long-term reliability. |
Applications
| Telematics Control Unit | Automotive Head Unit |
|---|---|
Use Scenario: Powering LTE/Wi-Fi modems, GPS receivers, and CAN gateway processors in vehicle connectivity modules during cold-crank and load-dump events. IC Role / Device Role / Timing Role: Primary 3.3-V buck regulator supplying core logic and RF ICs with tight voltage tolerance and fast transient response. Use Value: 15-µA quiescent current extends battery life in parked-telematics mode; 42-V surge tolerance avoids external TVS diodes. |
Use Scenario: Generating clean 3.3-V supply for infotainment SoCs, touch controllers, and audio codecs in center-stack displays. IC Role / Device Role / Timing Role: High-efficiency, low-noise DC-DC stage placed adjacent to noise-sensitive analog circuitry. Use Value: Spread-spectrum operation and optimized HotRod layout reduce conducted/radiated EMI - helps pass CISPR-25 without ferrite beads or shielding. |
| Instrument Cluster Display | ADAS Camera Power Module |
Use Scenario: Delivering regulated 3.3-V rail to microcontroller, TFT LCD driver, and backlight LED controller in digital instrument clusters. IC Role / Device Role / Timing Role: Main power converter with RESET output used for MCU reset sequencing and fault reporting. Use Value: Integrated 3-ms RESET release timer ensures reliable boot-up after power recovery; ±1% output accuracy maintains display timing integrity. |
Use Scenario: Providing stable 3.3-V supply to image sensor interface and ISP in rear-view or surround-view camera ECUs. IC Role / Device Role / Timing Role: Compact, thermally efficient buck regulator mounted near sensor module with minimal trace length. Use Value: VQFN-HR package with RθJB = 5.4°C/W enables 2.5-A operation at +105°C ambient without heatsink - reduces BOM count and footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM53635NQRNLTQ1 | 3.5-A rated output, higher current limit (IL-HS = 4.5–6 A), same 3.3-V fixed output and pinout - shares identical package and feature set. | Required where peak loads exceed 2.5 A (e.g., multi-camera ADAS nodes with burst processing). | Select when future-proofing for higher current or consolidating BOM across 2.5-A and 3.5-A variants. |
| TPS543320RTVR | 3-A output, 2.2-MHz switching, no spread spectrum, but supports PMBus telemetry and adjustable soft-start - different pinout and control interface. | Suitable for non-automotive industrial applications requiring digital monitoring or tighter transient response tuning. | Choose only if telemetry, programmability, or non-automotive qualification (e.g., industrial temp grade) is prioritized over AEC-Q100 compliance. |
Compared with LM53635NQRNLTQ1, the LM53625NQRNLTQ1 offers lower cost and thermal margin for 2.5-A use cases; versus TPS543320RTVR, it provides guaranteed automotive qualification and integrated EMI reduction without requiring firmware or configuration overhead.
Availability
LM53625NQRNLTQ1 is available at Aetrix Electronics and suitable for automotive telematics, head unit, and instrumentation cluster designs requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LM53625NQRNLTQ1 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 and embedded processing technologies, with decades of automotive power management innovation and AEC-Q100 validation expertise.
The LM536xx-Q1 product line delivers high-frequency, low-EMI synchronous buck regulators specifically engineered for automotive infotainment, ADAS, and body electronics - balancing efficiency, thermal performance, and functional safety readiness.
FAQ
What is the minimum input voltage required for LM53625NQRNLTQ1 to regulate a stable 3.3-V output?
The LM53625NQRNLTQ1 maintains regulation with as low as 3.55 V input at full 2.5-A load after startup, and 3.2 V minimum for light-load operation. This enables reliable operation during automotive cold-crank events where battery voltage dips below 6 V. The device's adaptive off-time spreading allows 98% duty cycle to sustain output even near dropout - a key advantage over fixed-frequency-only buck controllers.
Does LM53625NQRNLTQ1 require external compensation components?
No, the LM53625NQRNLTQ1 features fully integrated compensation - no external Type-II or Type-III compensation network is needed. Its internal error amplifier, PWM comparator, and current-sense circuitry are factory-tuned for stability with standard 22-µF output ceramic capacitors. This eliminates design iteration time and reduces bill-of-materials cost compared to controllers requiring external compensation.
How does the RESET output of LM53625NQRNLTQ1 function during power-up and fault conditions?
The LM53625NQRNLTQ1 RESET output is an open-drain signal that remains low for 3 ms after EN goes high and VOUT reaches regulation, then transitions high to indicate valid operation. It asserts low again during UVLO, thermal shutdown, or EN deactivation. Internal 12–45 µs glitch filtering prevents false resets from noise - eliminating need for external RC debounce networks in automotive environments.
Can LM53625NQRNLTQ1 synchronize to an external clock, and what is the acceptable frequency range?
Yes, LM53625NQRNLTQ1 accepts an external clock on the SYNC pin to align switching frequency across multiple converters. The supported range is 1.9 MHz to 2.3 MHz, with rising-edge triggering. This capability enables system-level EMI reduction by preventing beat frequencies and harmonic stacking - especially valuable in densely packed head unit PCBs with multiple DC-DC stages.
Is LM53625NQRNLTQ1 pin-compatible with other members of the LM536xx-Q1 family?
Yes, all LM53625-Q1 and LM53635-Q1 variants - including LM53625NQRNLTQ1, LM53635NQRNLTQ1, and fixed/adjustable versions - share identical 22-pin VQFN-HR (5.0 mm × 4.0 mm) packaging and pinout. This enables one PCB layout to support multiple output current and voltage options, simplifying design reuse and inventory management across automotive platforms.
LM53625NQRNLTQ1 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 ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 22-VQFN-HR (5x4)
LM53625NQRNLTQ1 FAQ
1.How can I place an order for LM53625NQRNLTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM53625NQRNLTQ1 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 LM53625NQRNLTQ1 reliable?
The price and inventory of LM53625NQRNLTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM53625NQRNLTQ1 is usually 5 days.
3.What payment methods are accepted for LM53625NQRNLTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM53625NQRNLTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM53625NQRNLTQ1?
LM53625NQRNLTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM53625NQRNLTQ1 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 LM53625NQRNLTQ1?
For technical support, including LM53625NQRNLTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM53625NQRNLTQ1 requirements.
6.How does Aetrix verify that LM53625NQRNLTQ1 is sourced from the original manufacturer or authorized distributors?
All LM53625NQRNLTQ1 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 LM53625NQRNLTQ1 meets industry standards.
7.What is the process for return or replacement of LM53625NQRNLTQ1?
All LM53625NQRNLTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM53625NQRNLTQ1, 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 LM53625NQRNLTQ1 part is unused and in its original packaging.
Return procedure for LM53625NQRNLTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM53625NQRNLTQ1 Tags
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