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Texas Instruments LM53625LQURNLRQ1
- Part No.:
- LM53625LQURNLRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LM53625LQURNLRQ1.pdf
- Description:
- IC REG BUCK 5V 2.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
LM53625LQURNLRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck DC-DC converter delivering 5 V fixed output at up to 2.5 A, operating from 3.9 V to 36 V input with 2.1-MHz switching frequency, ±1% output voltage tolerance over –40°C to +125°C junction temperature, and 15-µA quiescent current at no load-designed for telematics power rails requiring low EMI and high reliability.
For engineers reviewing the LM53625LQURNLRQ1 datasheet, LM53625LQURNLRQ1 pinout, LM53625LQURNLRQ1 application, or LM53625LQURNLRQ1 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, instrumentation cluster, and battery-powered automotive subsystems.
Technical Context
The LM53625LQURNLRQ1 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-including 18 V → 3.3 V conversion. Its flip-chip HotRod QFN package minimizes parasitic inductance, reducing switch-node ringing and radiated EMI without external filtering.
It integrates internal compensation, soft-start (3.2 ms), open-drain RESET with 3-ms release timer and built-in glitch filter (25 µs), FPWM mode control, and dual-power-ground architecture (PGND1/PGND2) for optimized thermal and noise performance. The BIAS pin enables efficient auxiliary biasing from the output rail, lowering system-level quiescent power.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5 V, ±1% accuracy over –40°C to +125°C TJ-ensures stable MCU/SOC core rail without external feedback divider. |
| Max Output Current | 2.5 A continuous-supports mid-tier automotive modules like display controllers and CAN transceivers without derating at 105°C ambient. |
| Input Voltage Range | 3.9 V to 36 V, with 42-V transient tolerance ≤500 ms-eliminates need for upstream TVS or active clamp in 12-V/24-V vehicle systems. |
| Switching Frequency | 2.1 MHz nominal, ±3% spread-spectrum option-places fundamental and harmonics above AM band (1.6 MHz), reducing EMI filter size and cost. |
| Quiescent Current | 15 µA typical at no load (3.3-V output), 20 µA at 5-V output-enables always-on functionality in battery-coupled domains without excessive drain. |
| Junction Temp Range | –40°C to +150°C-validated for under-hood placement and meets AEC-Q100 Grade 1 ambient (–40°C to +125°C). |
| Package | VQFN-HR (RNL), 5.0 mm × 4.0 mm, non-wettable flanks-supports automated optical inspection (AOI) without X-ray; thermal resistance RθJB = 5.4°C/W. |
Pinout & Package
VQFN-HR (RNL) 22-pin package, 5.0 mm × 4.0 mm body, 0.5-mm pitch, non-wettable flanks, exposed thermal pad (EP) connected to PGND internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Internal LDO output (3.1 V) | Supplies internal control circuitry; requires 4.7-µF capacitor to AGND for stability and noise rejection. |
| CBOOT | Bootstrap capacitor node | Connects 470-nF ceramic capacitor to SW; enables high-side MOSFET gate drive during each switching cycle. |
| SYNC | External clock input | Accepts 1.9–2.3 MHz system clock (rising-edge triggered); synchronizes switching to avoid beat frequencies in multi-rail systems. |
| PVIN1 / PVIN2 | Main power inputs | Dual VIN pins reduce IR drop and loop inductance; must be shorted together on PCB near input capacitors. |
| SW | Switch node | Connects directly to power inductor; high di/dt path-requires tight layout and minimal trace length to suppress EMI. |
| PGND1 / PGND2 | Power ground terminals | Eight dedicated PGND pins (pins 5–8, 10–13) lower ground impedance and improve thermal dissipation; must tie to AGND at single point. |
| AVIN | Analog input supply | Bias source for analog circuitry; connect directly to PVIN net-decouples noise-sensitive reference and error amplifier from power paths. |
| FPWM | Forced PWM mode control | Logic-high disables light-load diode emulation; ensures constant 2.1-MHz operation for EMI predictability and transient response consistency. |
| EN | Enable input | Active-high (1.7–2.0 V threshold); supports direct connection to VIN or microcontroller GPIO; hysteresis prevents chatter during brownout. |
| RESET | Open-drain fault flag | Asserts low on UVLO, overtemperature, or EN deactivation; includes internal 3-ms release timer and 25-µs glitch filter-replaces discrete supervisor IC. |
| FB | Feedback input | Internally tied to 5-V reference; unused in fixed-output variant-no external resistor divider required, saving board space and leakage current. |
| BIAS | Auxiliary bias input | Connected to 5-V output; powers internal LDO efficiently, reducing total system IQ versus using external bias supply. |
Key Features
| Feature | Design Value |
|---|---|
| Spread-spectrum modulation | ±3% frequency dithering reduces peak EMI amplitude by >10 dB, enabling compliance with CISPR 25 Class 5 without added shielding or ferrites. |
| Integrated RESET with timing | 3-ms release delay and 25-µs glitch filter provide clean, debounced system reset signal-eliminates need for external RC network or supervisor IC. |
| Low-RDS(on) power switches | High-side: 60–130 mΩ, low-side: 40–80 mΩ at 1 A-delivers >90% efficiency at 13.5 V → 5 V / 3.5 A, minimizing thermal stress in compact layouts. |
| HotRod QFN package | Flip-chip construction with optimized pin layout cuts switch-node loop inductance by >50% versus standard QFN-suppresses voltage overshoot and radiated emissions. |
| Ultra-low shutdown current | 2–5 µA over –40°C to +150°C-enables direct connection to battery without external load switch, simplifying always-on domain power architecture. |
Applications
| Telematics Module Power | Head Unit Core Rail |
|---|---|
|
Use Scenario: Powers LTE modem, GNSS receiver, and secure element in automotive telematics control unit (TCU) with cold-crank immunity and low standby drain. IC Role / Device Role / Timing Role: Primary 5-V buck regulator supplying SoC I/O, memory, and communication interfaces; maintains regulation during 4.5-V cranking dips. Use Value: 300-mV dropout capability and 42-V transient tolerance eliminate need for pre-regulator stage; 15-µA IQ extends battery life in parked state. |
Use Scenario: Delivers clean, stable 5-V rail to infotainment processor, audio codec, and touch controller in digital head unit with strict EMI limits. IC Role / Device Role / Timing Role: Fixed-output synchronous buck converter with integrated soft-start and RESET-synchronizes power-up sequencing with display and baseband ICs. Use Value: 2.1-MHz switching and spread spectrum meet CISPR 25 Class 5 radiated emissions; FPWM mode ensures consistent transient response during UI rendering bursts. |
| Instrumentation Cluster Supply | Battery-Powered Diagnostic Tool |
|
Use Scenario: Supplies 5-V logic rail for TFT display driver, stepper motor controllers, and CAN FD transceivers in digital instrument cluster with extended temperature range. IC Role / Device Role / Timing Role: AEC-Q100 Grade 1 DC-DC converter handling 12-V battery input with load dump protection and junction temp monitoring up to 150°C. Use Value: RθJB = 5.4°C/W and wettable-flank–compatible (non-wettable flank variant still AOI-friendly) package enables conduction-cooled layout on small PCB area. |
Use Scenario: Powers handheld OBD-II diagnostic tool with USB-C PD input, Bluetooth SoC, and OLED display-operating from 12-V vehicle port or Li-ion battery pack. IC Role / Device Role / Timing Role: High-efficiency 5-V step-down regulator supporting wide-input operation (3.9–36 V) and ultra-low IQ for multi-day battery runtime. Use Value: 2.5-A capability drives display backlight and radio simultaneously; 5-µA shutdown current preserves charge during storage or intermittent use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM53625NQURNLRQ1 | Same 5-V fixed output, spread-spectrum enabled, but rated for 3.3-V output variant-this part is not functionally identical; LM53625LQURNLRQ1 is the correct 5-V version. | Not suitable as direct replacement-output voltage mismatch invalidates use in 5-V systems. | Select only if 3.3-V output is required; verify FB network compatibility and load current rating (2.5 A same). |
| LM53635LQRNLRQ1 | Identical 5-V fixed output and spread-spectrum feature, but rated for 3.5-A max output and higher current-limit thresholds (IL-HS = 4.5–7.5 A vs. 3.5–6.5 A). | Supports higher-power loads (e.g., multi-core processors, high-brightness displays); requires review of thermal margin and inductor saturation current. | Choose when >2.5 A sustained load is needed; note larger current sense tolerances and slightly higher RDS(on) trade-off for robustness. |
Compared with LM53625LQURNLRQ1, LM53635LQRNLRQ1 offers +1-A output headroom and enhanced overload protection, while LM53625NQURNLRQ1 is a mismatched 3.3-V variant unsuitable for 5-V designs-making LM53635LQRNLRQ1 the only viable functional alternative for higher-current 5-V applications.
Availability
LM53625LQURNLRQ1 is available at Aetrix Electronics and suitable for telematics, head unit, and instrumentation cluster applications requiring stable component supply, AEC-Q100 qualification, and long-term automotive lifecycle support.
Supply support for LM53625LQURNLRQ1 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 ISO/TS 16949-certified manufacturing.
The LM53625-Q1 product line delivers high-frequency, low-EMI synchronous buck regulators optimized for automotive infotainment, ADAS, and body electronics-prioritizing AEC-Q100 compliance, thermal resilience, and system-level integration.
FAQ
What is the output voltage and tolerance of the LM53625LQURNLRQ1?
The LM53625LQURNLRQ1 provides a fixed 5-V output with ±1% tolerance over the full junction temperature range of –40°C to +125°C. This specification is guaranteed by production test and applies under recommended operating conditions (VIN = 3.9 V to 36 V, IOUT = 0–2.5 A). The internal reference is trimmed to 1.000 V, and feedback is hardwired-no external resistors affect accuracy. LM53625LQURNLRQ1 maintains this precision even during cold-crank events where input dips to 3.9 V.
Does the LM53625LQURNLRQ1 support external frequency synchronization?
Yes, the LM53625LQURNLRQ1 supports external synchronization via its SYNC pin (Pin 3), which accepts a 1.9–2.3 MHz square-wave clock with ≥25% duty cycle. Synchronization is rising-edge triggered and maintains stable phase alignment across multiple converters-critical for noise-sensitive automotive audio or camera systems. When SYNC is unused, the device operates at its nominal 2.1-MHz center frequency with optional spread-spectrum modulation. LM53625LQURNLRQ1 does not require pull-up/down on SYNC for default operation.
What is the purpose of the BIAS pin on the LM53625LQURNLRQ1?
The BIAS pin (Pin 22) on the LM53625LQURNLRQ1 connects to the regulated 5-V output to power the internal LDO and bias circuitry more efficiently than drawing from VIN. This reduces total input current-especially at light loads-and improves overall system efficiency. TI specifies connecting BIAS directly to VOUT with low-inductance routing; bypassing it or leaving it floating degrades quiescent current and may cause startup failure. LM53625LQURNLRQ1 achieves 15-µA IQ only when BIAS is properly implemented.
How does the RESET function work on the LM53625LQURNLRQ1?
The LM53625LQURNLRQ1 features an open-drain RESET output (Pin 19) that asserts low during EN deactivation, output undervoltage (<94% of VOUT), or thermal shutdown. It includes a built-in 3-ms release timer after fault clearance and a 25-µs glitch filter to reject noise-induced false triggers. A 10-kΩ pull-up to 5-V rail is typical; RESET sinks up to 1 mA with <0.4-V VOL. This eliminates need for external supervisor ICs in most automotive applications. LM53625LQURNLRQ1's RESET behavior is fully characterized across temperature and input voltage.
Is the LM53625LQURNLRQ1 pin-compatible with other variants in the LM53625-Q1 family?
Yes, all LM53625-Q1 variants-including LM53625LQURNLRQ1-share identical VQFN-HR (RNL) 22-pin pinout and footprint, regardless of output voltage (3.3 V, 5 V, adjustable), spread-spectrum enablement, or wettable flank option. This allows design reuse across configurations: e.g., LM536253QRNLRQ1 (3.3 V) and LM53625LQURNLRQ1 (5 V) use the same PCB layout. However, FB network and BIAS routing remain unchanged-only output capacitor and inductor values differ per application. LM53625LQURNLRQ1 requires no layout revision when substituting within the same package variant.
LM53625LQURNLRQ1 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):
- 5V
- 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)
LM53625LQURNLRQ1 FAQ
1.How can I place an order for LM53625LQURNLRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM53625LQURNLRQ1 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 LM53625LQURNLRQ1 reliable?
The price and inventory of LM53625LQURNLRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM53625LQURNLRQ1 is usually 5 days.
3.What payment methods are accepted for LM53625LQURNLRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM53625LQURNLRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM53625LQURNLRQ1?
LM53625LQURNLRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM53625LQURNLRQ1 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 LM53625LQURNLRQ1?
For technical support, including LM53625LQURNLRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM53625LQURNLRQ1 requirements.
6.How does Aetrix verify that LM53625LQURNLRQ1 is sourced from the original manufacturer or authorized distributors?
All LM53625LQURNLRQ1 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 LM53625LQURNLRQ1 meets industry standards.
7.What is the process for return or replacement of LM53625LQURNLRQ1?
All LM53625LQURNLRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM53625LQURNLRQ1, 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 LM53625LQURNLRQ1 part is unused and in its original packaging.
Return procedure for LM53625LQURNLRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM53625LQURNLRQ1 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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