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Texas Instruments LM53625AQRNLTQ1
- Part No.:
- LM53625AQRNLTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LM53625AQRNLTQ1.pdf
- Description:
- IC REG BUCK ADJ 2.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,319
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Product details
Overview
LM53625AQRNLTQ1 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 high efficiency and low EMI.
For engineers reviewing the LM53625AQRNLTQ1 datasheet, LM53625AQRNLTQ1 pinout, LM53625AQRNLTQ1 application, or LM53625AQRNLTQ1 equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade thermal and ESD specs, and real-world design implications for head unit and instrumentation cluster power systems.
Technical Context
The LM53625AQRNLTQ1 implements peak-current-mode control with adaptive frequency 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 → 3.3 V conversion without duty-cycle limitation. Its HotRod QFN package minimizes parasitic inductance, reducing switch-node ringing and radiated EMI.
It integrates internal compensation, soft-start (3.2 ms), open-drain RESET with 3-ms release timer and built-in glitch filtering (25 µs), plus FPWM pin-selectable forced PWM mode to eliminate light-load frequency modulation - supporting stable 2.1-MHz operation under all load conditions including battery-powered instrumentation clusters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.55 V to 36 V - supports cold-crank (3.55 V min) and load-dump (42 V transient, ≤500 ms) without external protection |
| Output Current | 2.5 A continuous - rated for full-load operation at 125°C junction temperature with 0.6-V dropout |
| Switching Frequency | 2.1 MHz (±150 kHz) - enables compact 2.2-µH inductors and avoids AM-band interference |
| Quiescent Current | 15 µA typical at 3.3-V output, no load - eliminates need for backup LDO in always-on telematics modules |
| Output Accuracy | ±1% over –40°C to +125°C TJ - ensures reliable microcontroller core voltage regulation in instrument clusters |
| RESET Function | Open-drain output with 3-ms release delay and 12–45 µs internal glitch filter - replaces discrete supervisor IC in automotive ECUs |
| Junction Temp Range | –40°C to +150°C - qualified for under-hood applications with 1000-hour lifetime at 125°C |
Pinout & Package
LM53625AQRNLTQ1 uses a 5.0-mm × 4.0-mm VQFN-HR (22-pin) package with wettable flanks for automated optical solder-joint inspection. Thermal resistance: RθJA = 29.4°C/W, RθJC(bot) = 2.4°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Internal 3.1-V LDO output | Power source for internal control logic; requires 4.7-µF capacitor to AGND for stability |
| CBOOT | Bootstrap capacitor node | Connects 470-nF capacitor to SW; enables high-side MOSFET gate drive above VIN |
| SYNC | External clock input | Accepts 1.9–2.3 MHz system clock (rising-edge triggered); synchronizes switching to avoid beat frequencies |
| PVIN1 / PVIN2 | Main power inputs | Dual high-current VIN pins; must be shorted on PCB to minimize loop inductance and EMI |
| SW | Switch node | Connects directly to power inductor; high dv/dt node requiring tight layout and ground shielding |
| PGND1 / PGND2 | Power ground terminals | Eight dedicated GND pins; must be tied together and connected to AGND at single point for noise isolation |
| FB | Feedback input | For adjustable version: connects to resistor divider; reference voltage = 1.0 V ±0.5% |
| EN | Enable input | Active-high logic; threshold = 1.7–2.0 V; hysteresis = 0.5 V - supports direct connection to battery via RC delay |
| RESET | Open-drain fault flag | Asserts low when EN = low or output undervoltage; requires external pull-up; sink capability = 1 mA @ 0.4 V |
| FPWM | Mode control input | High = forced PWM (fixed 2.1 MHz); low = automatic light-load mode with diode emulation |
| BIAS | Auxiliary bias supply | Connected to output rail; reduces power loss vs. internal LDO-only biasing; improves efficiency at light loads |
| AVIN | Analog input supply | Tied to PVIN on PCB; powers analog circuitry (error amp, reference) - decoupling critical for PSRR |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C ambient), HBM ±2500 V, CDM ±1000 V - certified for safety-critical body electronics |
| Low-EMI HotRod packaging | VQFN-HR with wettable flanks and flip-chip interconnect - reduces switch-node ringing by >50% vs. standard QFN |
| Spread-spectrum operation | ±3% frequency dithering centered at 2.1 MHz - lowers peak EMI by 10 dB without affecting regulation performance |
| Built-in RESET with timing | Internally filtered open-drain output with 3-ms release delay and 25-µs glitch rejection - removes need for external supervisor IC |
| Pin-selectable FPWM mode | Single-resistor interface to force constant 2.1-MHz PWM - eliminates audible noise and ensures predictable EMI in infotainment systems |
| Integrated compensation | Single-type-II compensation network - eliminates 3 external components vs. controller-based solutions, reducing BOM cost and layout area |
Applications
| Telematics Power Supply | Head Unit Core Rail |
|---|---|
|
Use Scenario: Powers LTE modem, GNSS receiver, and CAN transceiver in vehicle connectivity modules operating across battery voltage range (5.5–16 V) with cold-crank survival. IC Role / Device Role / Timing Role: Primary 3.3-V/2.5-A buck regulator with integrated RESET and SYNC - manages power sequencing and system-level fault signaling. Use Value: 15-µA quiescent current extends battery backup time; 2.1-MHz switching allows use of 2.2-µH shielded inductor occupying <25 mm² PCB area. |
Use Scenario: Supplies SoC core voltage in automotive infotainment head units where EMI must stay below CISPR-25 Class 5 limits near AM/FM antennas. IC Role / Device Role / Timing Role: High-efficiency synchronous buck with spread spectrum and HotRod packaging - serves as main DC-DC stage before point-of-load regulators. Use Value: Low switch-node ringing and ±3% frequency dither reduce 150–250 MHz radiated emissions by 8–12 dB, eliminating costly ferrite beads or metal shielding. |
| Instrumentation Cluster Display | ADAS Camera Module Power |
|
Use Scenario: Generates stable 5-V rail for TFT-LCD backlight drivers and microcontroller in digital instrument clusters exposed to under-dash thermal cycling (–40°C to +85°C). IC Role / Device Role / Timing Role: Fixed 5-V output buck with ±1% accuracy and 150°C max junction rating - ensures display brightness consistency across temperature extremes. Use Value: 0.6-V dropout at 2.5 A enables operation down to 5.6-V input during engine cranking; RESET output validates rail integrity before display initialization. |
Use Scenario: Provides clean 3.3-V supply to image sensor and ISP in rear-view camera modules mounted near exhaust systems (ambient up to 105°C). IC Role / Device Role / Timing Role: Adjustable-output buck with BIAS pin connection to output - achieves >90% efficiency at 3.3 V/1.2 A while minimizing self-heating. Use Value: BIAS-connected operation reduces quiescent loss by 40% vs. VCC-biasing; RθJC(bot) = 2.4°C/W enables conduction cooling through PCB copper pour. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM53635AQRNLTQ1 | 3.5-A output current, higher HS/LS current limits (IL-HS = 4.5–6 A), same package and pinout | Required for designs needing >2.5 A sustained load, e.g., multi-display instrument clusters with touch controllers | Select when peak load exceeds 2.5 A or when future-proofing for higher-power derivatives |
| TPS543620QPWPRQ1 | 3.5-A, 36-V input, 2.2-MHz sync-capable, but no spread spectrum or integrated RESET; larger 6-mm × 6-mm HTSSOP | Lacks built-in RESET and EMI-reduction features; requires external supervisor and more board space | Choose only if footprint compatibility with legacy HTSSOP layouts is mandatory and EMI filtering can be added externally |
Compared with LM53635AQRNLTQ1, the LM53625AQRNLTQ1 trades 1-A output capacity for identical feature set and smaller solution size; versus TPS543620QPWPRQ1, it delivers superior EMI performance and system integration at the cost of non-pin-compatible packaging.
Availability
LM53625AQRNLTQ1 is available at Aetrix Electronics and suitable for automotive telematics, head unit power management, and instrumentation cluster applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LM53625AQRNLTQ1 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 deep expertise in automotive power management ICs and functional-safety-compliant design.
The LM536xx-Q1 product line delivers high-frequency, low-EMI DC-DC converters optimized for automotive infotainment, ADAS, and body electronics - emphasizing AEC-Q100 reliability, thermal robustness, and system-level integration.
FAQ
What is the minimum input voltage required for LM53625AQRNLTQ1 to start and regulate?
The LM53625AQRNLTQ1 has a rising UVLO threshold of 3.2 V to 3.55 V (typical 3.55 V), with hysteresis of 0.3 V. It can regulate a 3.3-V output from as low as 3.55 V input after startup, enabling operation during automotive cold-crank events. The device maintains regulation down to 300-mV dropout at full load, making LM53625AQRNLTQ1 suitable for battery-supplied systems with wide voltage excursions.
Does LM53625AQRNLTQ1 support external synchronization, and what is the valid frequency range?
Yes, LM53625AQRNLTQ1 supports external synchronization via the SYNC pin, accepting a 1.9-MHz to 2.3-MHz square wave (rising-edge triggered). This allows alignment of switching frequency with system clocks to avoid heterodyne interference in sensitive RF sections like telematics modems. The internal oscillator remains locked within ±150 kHz of the external signal, ensuring stable operation without jitter accumulation in LM53625AQRNLTQ1-based designs.
How does the RESET output of LM53625AQRNLTQ1 behave during startup and fault conditions?
The LM53625AQRNLTQ1 RESET output is an open-drain flag that goes low when EN is deasserted or when output voltage falls below 94% of nominal (e.g., <3.102 V for 3.3-V output). It features a 3-ms release delay after regulation is restored and internal 25-µs glitch filtering to reject noise-induced false triggers. This behavior makes LM53625AQRNLTQ1's RESET function suitable as a primary system power-good signal without external debouncing circuitry.
Can LM53625AQRNLTQ1 operate in forced PWM mode, and how is it enabled?
Yes, LM53625AQRNLTQ1 supports forced PWM mode via the FPWM pin: driving FPWM ≥1.5 V selects constant 2.1-MHz switching regardless of load, disabling diode emulation and light-load frequency foldback. This ensures predictable EMI profile and eliminates audible coil whine in head unit audio subsystems. The FPWM pin draws only 1 µA leakage, allowing simple resistor-divider or GPIO control - a key differentiator of LM53625AQRNLTQ1 in noise-sensitive applications.
What thermal performance can be expected from LM53625AQRNLTQ1 in a standard 4-layer PCB layout?
In a standard 4-layer PCB with 1-in² 2-oz copper thermal pad connected to internal ground planes, LM53625AQRNLTQ1 achieves RθJB = 5.4°C/W and RθJC(bot) = 2.4°C/W. At 2.5-A load and 13.5-V input, power dissipation is ~0.4 W, resulting in ~2.2°C rise above board temperature - well within the –40°C to +150°C junction limit. This thermal margin enables LM53625AQRNLTQ1 deployment in sealed enclosures without active cooling in instrument clusters.
LM53625AQRNLTQ1 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)
LM53625AQRNLTQ1 FAQ
1.How can I place an order for LM53625AQRNLTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM53625AQRNLTQ1 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 LM53625AQRNLTQ1 reliable?
The price and inventory of LM53625AQRNLTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM53625AQRNLTQ1 is usually 5 days.
3.What payment methods are accepted for LM53625AQRNLTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM53625AQRNLTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM53625AQRNLTQ1?
LM53625AQRNLTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM53625AQRNLTQ1 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 LM53625AQRNLTQ1?
For technical support, including LM53625AQRNLTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM53625AQRNLTQ1 requirements.
6.How does Aetrix verify that LM53625AQRNLTQ1 is sourced from the original manufacturer or authorized distributors?
All LM53625AQRNLTQ1 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 LM53625AQRNLTQ1 meets industry standards.
7.What is the process for return or replacement of LM53625AQRNLTQ1?
All LM53625AQRNLTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM53625AQRNLTQ1, 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 LM53625AQRNLTQ1 part is unused and in its original packaging.
Return procedure for LM53625AQRNLTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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