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Texas Instruments LM53625MQRNLTQ1
- Part No.:
- LM53625MQRNLTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LM53625MQRNLTQ1.pdf
- Description:
- IC REG BUCK ADJ 2.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:750
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Product details
Overview
LM53625MQRNLTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck DC-DC converter delivering up to 2.5 A at 36 V input, 2.1-MHz fixed switching frequency, ±1% output voltage accuracy (–40°C to +125°C), and 15-µA quiescent current at no load with 3.3-V output - used in telematics power rails requiring low EMI and high reliability.
For engineers reviewing the LM53625MQRNLTQ1 datasheet, LM53625MQRNLTQ1 pinout, LM53625MQRNLTQ1 application, or LM53625MQRNLTQ1 equivalent, key selection considerations include spread-spectrum capability, external frequency synchronization, open-drain RESET with 3-ms release timer, wettable-flank VQFN package, and adjustable-output configuration with built-in compensation.
Technical Context
The LM53625MQRNLTQ1 employs peak-current-mode control with adaptive frequency spreading to maintain regulation down to 300-mV dropout at full load 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 3.1-V LDO (VCC), bootstrap gate drive (CBOOT), analog ground separation (AGND vs PGND), and dual-power-ground layout (PGND1/PGND2) for thermal and noise performance. The device supports forced PWM mode via FPWM pin and system-level reset supervision via open-drain RESET with internal filtering and 12–45 µs glitch rejection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.55 V to 36 V - enables direct battery connection with transient tolerance up to 42 V for ≤500 ms. |
| Output Current | 2.5 A continuous - rated for automotive instrumentation cluster and head unit power supplies. |
| Switching Frequency | 2.1 MHz (±3% with spread spectrum) - avoids AM band, allows compact 1.0-µH inductors and ceramic output capacitors. |
| Quiescent Current | 15 µA typical at no load (3.3-V output) - eliminates need for backup LDO in always-on systems. |
| Output Accuracy | ±1% over –40°C to +125°C junction - ensures stable microcontroller I/O and sensor biasing without recalibration. |
| Dropout Voltage | 0.6 V at 3.5 A, 105°C TA - maintains regulation during cold-crank transients when input dips near output level. |
| RESET Function | Open-drain output with 3-ms release timer and 92–96.5% lower threshold - provides reliable power-good signaling without external supervisor IC. |
Pinout & Package
LM53625MQRNLTQ1 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 (Pin 1) | Internal LDO output | Supplies 3.1 V to control circuitry; requires 4.7-µF capacitor to AGND for stability. |
| CBOOT (Pin 2) | Bootstrap capacitor node | Drives high-side MOSFET gate; connects via 470-nF capacitor to SW for proper turn-on. |
| SYNC (Pin 3) | Frequency synchronization input | Accepts 1.9–2.3 MHz external clock (rising-edge triggered); enables system-wide timing alignment. |
| PVIN1/PVIN2 (Pins 4,14) | Main power input | Parallel high-current VIN paths; must be shorted on PCB with low-inductance layout. |
| SW (Pin 9) | Switch node | Connects directly to power inductor; critical for EMI control due to fast edge rates and HotRod layout. |
| FB (Pin 21) | Feedback input | Monitors output voltage divider (adjustable version); sets regulation point at 1.0 V reference. |
| BIAS (Pin 22) | Auxiliary bias supply input | Connected to regulated output to improve light-load efficiency and reduce IQ. |
| RESET (Pin 19) | Open-drain power-good flag | Asserts low on fault or EN deactivation; includes internal filter and 3-ms release delay. |
| EN (Pin 18) | Enable control input | Active-high logic; 1.7–2.0 V threshold with 0.5 V hysteresis; must not float. |
| FPWM (Pin 16) | Forced PWM mode select | High = constant 2.1-MHz switching; low = automatic diode-emulation light-load mode. |
Key Features
| Feature | Design Value |
|---|---|
| Spread-spectrum modulation | ±3% frequency dithering reduces peak EMI by >10 dB without compromising regulation or efficiency. |
| Integrated compensation network | Eliminates external loop compensation components - simplifies design and improves production yield. |
| Wettable-flank VQFN package | Enables AOI-based solder-joint verification - critical for zero-defect automotive manufacturing. |
| Low-noise HotRod flip-chip layout | Reduces switch-node ringing and common-mode EMI through minimized loop inductance and magnetic field cancellation. |
| Built-in soft-start (2–5 ms) | Prevents inrush current and output overshoot during power-up - protects downstream FPGAs and processors. |
Applications
| Telematics Power Supply | Instrument Cluster Core Rail |
|---|---|
Use Scenario: Powers LTE modem, GNSS receiver, and CAN transceivers in vehicle connectivity modules operating across cold-crank (4.5 V) to load-dump (42 V) conditions. IC Role / Device Role / Timing Role: Primary 3.3-V buck regulator with spread-spectrum EMI reduction and RESET supervision for host MCU boot sequencing. Use Value: 15-µA IQ extends battery backup runtime; 2.1-MHz switching enables <12 mm² total solution size including magnetics and caps. |
Use Scenario: Supplies display controller, graphics processor, and touch interface in digital instrument clusters requiring Grade 1 ambient temperature operation. IC Role / Device Role / Timing Role: Adjustable-output buck converter configured for 1.8-V or 1.2-V core rail with external sync to display timing controller. Use Value: ±1% output accuracy ensures consistent LCD gamma correction; wettable flanks support IPC-A-610 Class 3 solder inspection. |
| Head Unit Audio DSP Rail | ADAS Camera Interface Power |
Use Scenario: Generates clean 1.1-V supply for audio DSP in infotainment head units where EMI must avoid FM band interference. IC Role / Device Role / Timing Role: Synchronous buck with forced PWM mode (FPWM = high) to eliminate audible switching noise in audio signal path. Use Value: Spread-spectrum disabled in FPWM mode yields deterministic 2.1-MHz clock - simplifies EMI filter design and meets CISPR-25 Class 5 limits. |
Use Scenario: Powers MIPI CSI-2 image sensor and serializer in rear-view or surround-view cameras exposed to under-hood temperatures. IC Role / Device Role / Timing Role: High-reliability buck regulator with 150°C junction rating and RESET output tied to camera SoC reset pin. Use Value: 0.6-V dropout at 105°C TA ensures uninterrupted operation during hot-soak; RESET release timer prevents false resets during thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM53635MQRNLTQ1 | 3.5-A output current, higher HS/LS current limits (4.5/3.5 A), identical pinout and features | Used where peak load exceeds 2.5 A (e.g., multi-core head unit SoCs) | Select when higher output current is required; shares same PCB layout and firmware interface. |
| TPS543B20RTWR | 3-A, 36-V, 2.2-MHz buck with PMBus interface and telemetry; larger 4-mm × 4-mm VQFN | Used in systems requiring real-time voltage/current/temperature monitoring and dynamic margining | Choose when digital control and telemetry outweigh cost and footprint advantages of LM53625MQRNLTQ1. |
Compared with LM53635MQRNLTQ1, the LM53625MQRNLTQ1 offers optimized cost and thermal performance for 2.5-A applications, while TPS543B20RTWR adds digital configurability at the expense of analog simplicity and BOM count.
Availability
LM53625MQRNLTQ1 is available at Aetrix Electronics and suitable for telematics, instrument cluster, and head unit designs requiring stable component supply, AEC-Q100 qualification, and long-term automotive lifecycle support.
Supply support for LM53625MQRNLTQ1 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 solutions with decades of automotive qualification experience.
The LM53625-Q1 product line delivers high-efficiency, low-EMI DC-DC conversion for automotive infotainment, ADAS, and body electronics - designed to meet stringent AEC-Q100 Grade 1 requirements and simplify EMI-compliant layout.
FAQ
What is the maximum junction temperature rating for LM53625MQRNLTQ1?
The LM53625MQRNLTQ1 is rated for continuous operation up to +150°C junction temperature, with guaranteed 1000-hour lifetime at ≤125°C and 408-hour lifetime at ≤150°C. This enables deployment in under-hood and high-ambient automotive locations where thermal derating is critical. The device includes thermal shutdown at 155–175°C with 15°C hysteresis to protect against sustained overtemperature events. All electrical specifications are ensured across –40°C to +150°C TJ.
Does LM53625MQRNLTQ1 support external frequency synchronization?
Yes, LM53625MQRNLTQ1 supports external frequency synchronization via the SYNC pin (Pin 3), which accepts a 1.9–2.3 MHz clock signal with rising-edge triggering. This allows precise alignment of switching edges across multiple regulators in complex automotive systems - reducing beat frequencies and simplifying EMI filter design. The internal oscillator remains active as backup if SYNC is unconnected or fails, ensuring robust operation.
How does the RESET output of LM53625MQRNLTQ1 function?
The LM53625MQRNLTQ1 provides an open-drain RESET output (Pin 19) that asserts low during startup until output reaches 92–96.5% of target voltage, then releases after a fixed 3-ms timer. It also pulls low when EN is deasserted or during overtemperature/fault conditions. The internal filter rejects glitches as short as 12 µs, eliminating need for external RC networks. RESET can directly drive MCU reset pins or be pulled up to any compatible voltage (≤8 V) with current limiting.
What package type and dimensions does LM53625MQRNLTQ1 use?
LM53625MQRNLTQ1 uses a 5.0-mm × 4.0-mm VQFN-HR (RNL) package with 22 pins and wettable flanks. The package features exposed thermal pad on bottom and optimized HotRod flip-chip layout to minimize parasitic inductance. Wettable flanks enable automated optical inspection (AOI) of solder joints - a key requirement for automotive IPC-A-610 Class 3 assembly. Pin pitch is 0.5 mm, and height is 0.8 mm max.
Is LM53625MQRNLTQ1 pin-compatible with other devices in the LM536xx-Q1 family?
Yes, LM53625MQRNLTQ1 is pin-compatible with all LM53625-Q1 and LM53635-Q1 variants in the same VQFN-HR (RNL) package, including fixed 3.3-V, 5-V, and adjustable-output versions with or without spread spectrum. This allows single PCB design reuse across multiple output configurations and current ratings - reducing NRE costs and accelerating qualification. Layout guidelines and thermal pads are identical across the family.
LM53625MQRNLTQ1 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:
- 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)
LM53625MQRNLTQ1 FAQ
1.How can I place an order for LM53625MQRNLTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM53625MQRNLTQ1 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 LM53625MQRNLTQ1 reliable?
The price and inventory of LM53625MQRNLTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM53625MQRNLTQ1 is usually 5 days.
3.What payment methods are accepted for LM53625MQRNLTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM53625MQRNLTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM53625MQRNLTQ1?
LM53625MQRNLTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM53625MQRNLTQ1 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 LM53625MQRNLTQ1?
For technical support, including LM53625MQRNLTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM53625MQRNLTQ1 requirements.
6.How does Aetrix verify that LM53625MQRNLTQ1 is sourced from the original manufacturer or authorized distributors?
All LM53625MQRNLTQ1 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 LM53625MQRNLTQ1 meets industry standards.
7.What is the process for return or replacement of LM53625MQRNLTQ1?
All LM53625MQRNLTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM53625MQRNLTQ1, 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 LM53625MQRNLTQ1 part is unused and in its original packaging.
Return procedure for LM53625MQRNLTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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