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Texas Instruments LM53625AQRNLRQ1
- Part No.:
- LM53625AQRNLRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LM53625AQRNLRQ1.pdf
- Description:
- IC REG BUCK ADJ 2.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,538
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Product details
Overview
LM53625AQRNLRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck DC-DC converter delivering up to 2.5 A at adjustable output voltage, operating from 3.9 V to 36 V input with 2.1-MHz fixed switching frequency and ±1% output voltage accuracy over –40°C to +125°C junction temperature. It integrates high-side/low-side MOSFETs, internal compensation, soft-start, and thermal shutdown - used in telematics power rails requiring low EMI and high reliability.
For engineers reviewing the LM53625AQRNLRQ1 datasheet, LM53625AQRNLRQ1 pinout, LM53625AQRNLRQ1 application, or LM53625AQRNLRQ1 equivalent, key selection considerations include its 22-pin VQFN-HR package with wettable flanks, 15-µA no-load quiescent current (3.3-V output), 0.6-V dropout at 3.5 A/105°C, spread-spectrum option, and external frequency synchronization capability.
Technical Context
The LM53625AQRNLRQ1 employs peak-current-mode control with adaptive frequency spreading to maintain regulation down to 300-mV input-output differential while preserving 2.1-MHz nominal switching frequency. Its HotRod QFN package minimizes parasitic inductance, reducing switch-node ringing and radiated EMI without requiring external snubbers.
It features integrated 3.1-V LDO (VCC), bootstrap gate drive (CBOOT), open-drain RESET with 3-ms release timer and internal glitch filter, and FPWM pin for forced PWM mode selection. The device supports both automatic light-load (diode emulation) and fixed-frequency operation, with built-in UVLO, thermal shutdown, and overcurrent protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2.5 A continuous; enables compact 5.0 mm × 4.0 mm power supply designs for mid-power automotive subsystems. |
| Input Voltage Range | 3.9 V to 36 V (with 42-V transient tolerance ≤500 ms); simplifies surge protection design in 12-V/24-V vehicle systems. |
| Switching Frequency | 2.1 MHz nominal (1.85–2.35 MHz range); allows use of small 1–2.2 µH inductors and avoids AM-band interference. |
| Quiescent Current | 15 µA typical at no load (3.3-V output); eliminates need for backup LDO in always-on automotive modules. |
| Output Voltage Accuracy | ±1% over –40°C to +125°C TJ; ensures stable microcontroller core or sensor rail regulation without external trimming. |
| Dropout Voltage | 0.6 V at 3.5 A and 105°C ambient; maintains regulation during cold-crank conditions where input dips near output level. |
| RESET Function | Open-drain output with 3-ms release timer and internal 12–45 µs glitch filter; replaces discrete supervisor IC in safety-critical clusters. |
Pinout & Package
LM53625AQRNLRQ1 uses a 5.0 mm × 4.0 mm, 22-pin VQFN-HR (RNL) package with wettable flanks for automated optical solder-joint inspection. Thermal resistance is RθJA = 29.4°C/W (JEDEC standard board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Internal 3.1-V LDO output | Supplies internal control circuitry; requires 4.7-µF capacitor to AGND for stability and noise suppression. |
| CBOOT (Pin 2) | Bootstrap capacitor node | Connects 470-nF capacitor to SW; enables high-side MOSFET gate drive above VIN without external charge pump. |
| SYNC (Pin 3) | External clock input | Accepts 1.9–2.3 MHz system clock (rising-edge triggered); synchronizes switching to reduce beat frequencies in multi-rail systems. |
| PVIN1/PVIN2 (Pins 4, 14) | Main power input | Dual high-current VIN pins; must be shorted on PCB to minimize loop inductance and improve transient response. |
| SW (Pin 9) | Switch node | Connects directly to power inductor; low parasitic inductance layout critical for EMI reduction and efficiency. |
| FB (Pin 21) | Feedback input | Connects to resistor divider for adjustable output; reference voltage is 1.0 V (±0.5% over temp); sets output as VOUT = 1.0 V × (1 + R1/R2). |
| EN (Pin 18) | Enable control | Active-high logic input; threshold 1.7–2.0 V rising; hysteresis 0.45–0.55 V; internal pull-down prevents floating. |
| RESET (Pin 19) | Open-drain fault flag | Asserts low when EN = low or output undervoltage occurs; requires external pull-up; 3-ms delay ensures clean system reset sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with HBM ±2.5 kV and CDM ±1 kV ESD robustness - meets automotive electronics reliability requirements. |
| Low EMI HotRod QFN package | Flip-chip construction with wettable flanks reduces switch-node loop inductance by >50% vs. standard QFN, suppressing radiated emissions without added filters. |
| Spread-spectrum modulation | ±3% frequency dithering (9 Hz pattern) lowers peak EMI amplitude by up to 10 dB, easing CISPR 25 Class 5 compliance in head unit designs. |
| Integrated RESET with filtering | On-die 3-ms release timer and 12–45 µs glitch filter eliminate need for external RC network or dedicated supervisor IC - saves BOM cost and board space. |
| Pin-selectable forced PWM | FPWM pin (Pin 16) disables light-load diode emulation; maintains constant 2.1-MHz switching under all loads - essential for noise-sensitive ADC or RF circuits. |
Applications
| Telematics Power Supply | Instrument Cluster Core Rail |
|---|---|
Use Scenario: Powers LTE modem, GNSS receiver, and CAN transceiver in connected vehicle telematics control unit (TCU) with battery input ranging from 6 V (cold crank) to 42 V (load dump). IC Role / Device Role / Timing Role: Primary 3.3-V or 5-V step-down regulator delivering 2.5 A with ultra-low quiescent current and high transient immunity. Use Value: 15-µA no-load IQ extends battery life in parked-state tracking; 42-V transient tolerance eliminates need for upstream TVS clamping. |
Use Scenario: Supplies microcontroller, display driver, and analog sensors in digital instrument cluster where EMI must meet strict CISPR 25 limits. IC Role / Device Role / Timing Role: High-efficiency, low-noise buck converter with spread-spectrum and HotRod packaging to suppress radiated emissions. Use Value: Reduced switch-node ringing and <10 dB EMI peak suppression enable single-layer EMI filter - cuts BOM cost and layout area by 30%. |
| Head Unit Audio Subsystem | ADAS Camera Interface Power |
Use Scenario: Generates clean 3.3-V bias for audio codec, DSP, and touch controller in infotainment head unit with shared 12-V battery rail. IC Role / Device Role / Timing Role: Adjustable-output buck regulator with FPWM mode to maintain fixed 2.1-MHz switching during audio playback, avoiding audible beat frequencies. Use Value: Forced PWM eliminates variable-frequency switching noise that could modulate into audio path - improves SNR by ≥40 dB. |
Use Scenario: Provides regulated 5-V or 3.3-V power to MIPI CSI-2 camera module in rear-view or surround-view ADAS system. IC Role / Device Role / Timing Role: Automotive-grade buck converter with RESET output synchronized to camera boot sequence for deterministic initialization. Use Value: Integrated 3-ms RESET release timer ensures camera firmware starts only after stable VOUT - prevents image corruption during cold start. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM53635AQRNLRQ1 | 3.5-A rated output (vs. 2.5 A), higher HS/LS current limits (4.5–7.5 A vs. 3.5–6.5 A), identical pinout and feature set. | Suitable for higher-current loads like multi-core SoCs or dual-display head units; requires larger inductor and output capacitor. | Select when sustained >2.2 A load current or higher peak transient margin is required; same PCB layout usable with minor component value updates. |
| TPS543620RPWR | 3.5-A, 36-V input, 2.2-MHz sync-buck with PMBus interface; no spread spectrum; higher 25-µA IQ; different 16-pin WQFN package. | Lacks automotive qualification (AEC-Q100 not claimed); supports digital configuration but adds firmware complexity. | Prefer for non-automotive industrial applications needing telemetry or dynamic voltage scaling; avoid where AEC-Q100 Grade 1 or EMI certification is mandatory. |
Compared with LM53635AQRNLRQ1, LM53625AQRNLRQ1 offers lower cost and smaller magnetics for sub-2.5-A loads, while TPS543620RPWR trades automotive compliance for digital configurability - making LM53625AQRNLRQ1 optimal for cost- and EMI-constrained AEC-Q100 systems.
Availability
LM53625AQRNLRQ1 is available at Aetrix Electronics and suitable for telematics, instrument cluster, head unit, and ADAS camera interface applications requiring stable component supply, long-term automotive lifecycle support, and traceable sourcing.
Supply support for LM53625AQRNLRQ1 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 ICs, with decades of automotive qualification expertise and broad AEC-Q100 product portfolio.
LM53625AQRNLRQ1 belongs to TI's automotive-optimized DC-DC converter family designed for high-reliability, low-EMI power delivery in infotainment, body electronics, and ADAS subsystems - emphasizing robustness, integration, and simplified layout.
FAQ
What is the maximum input voltage rating for LM53625AQRNLRQ1, and how does it handle transients?
The LM53625AQRNLRQ1 has an absolute maximum input voltage rating of 40 V across PVIN1, PVIN2, and AVIN pins. It sustains 42-V transients for ≤500 ms at ≤0.01% duty cycle - enabling direct connection to 12-V/24-V automotive batteries without external overvoltage clamping in most load-dump scenarios.
Does LM53625AQRNLRQ1 support adjustable output voltage, and what is the feedback reference voltage?
Yes, LM53625AQRNLRQ1 supports adjustable output voltage via the FB pin. Its internal reference voltage is 1.000 V (±0.5% over temperature), allowing precise output setting using a resistor divider: VOUT = 1.0 V × (1 + R1/R2). The datasheet specifies ±1% total output accuracy over –40°C to +125°C junction temperature.
How does the RESET output of LM53625AQRNLRQ1 function, and what timing parameters apply?
The LM53625AQRNLRQ1 provides an open-drain RESET output that asserts low during startup until output reaches 94–96.5% of target voltage, then releases high after a fixed 2–4 ms delay. It includes internal 12–45 µs glitch filtering and remains low if EN is deasserted - ensuring reliable system-level power sequencing without external components.
Can LM53625AQRNLRQ1 operate with input voltage below 3.9 V, and what is the minimum functional input?
Yes - LM53625AQRNLRQ1 can regulate down to 3.55 V input (rising) for 3.3-V output after startup, per Section 7.6. This extended low-input capability enables operation during cold-crank events. However, full functionality (including 2.1-MHz switching and ±1% accuracy) requires ≥3.9 V input at maximum load.
What package type and thermal performance does LM53625AQRNLRQ1 offer?
LM53625AQRNLRQ1 uses a 5.0 mm × 4.0 mm, 22-pin VQFN-HR (RNL) package with wettable flanks. Its thermal metrics include RθJA = 29.4°C/W (JEDEC standard board) and RθJB = 5.4°C/W, enabling 2.5-A operation at +105°C ambient with standard 2-layer PCB copper pours - verified per JEDEC JESD51-7.
LM53625AQRNLRQ1 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)
LM53625AQRNLRQ1 FAQ
1.How can I place an order for LM53625AQRNLRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM53625AQRNLRQ1 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 LM53625AQRNLRQ1 reliable?
The price and inventory of LM53625AQRNLRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM53625AQRNLRQ1 is usually 5 days.
3.What payment methods are accepted for LM53625AQRNLRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM53625AQRNLRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM53625AQRNLRQ1?
LM53625AQRNLRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM53625AQRNLRQ1 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 LM53625AQRNLRQ1?
For technical support, including LM53625AQRNLRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM53625AQRNLRQ1 requirements.
6.How does Aetrix verify that LM53625AQRNLRQ1 is sourced from the original manufacturer or authorized distributors?
All LM53625AQRNLRQ1 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 LM53625AQRNLRQ1 meets industry standards.
7.What is the process for return or replacement of LM53625AQRNLRQ1?
All LM53625AQRNLRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM53625AQRNLRQ1, 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 LM53625AQRNLRQ1 part is unused and in its original packaging.
Return procedure for LM53625AQRNLRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM53625AQRNLRQ1 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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