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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Texas Instruments LM53625LQRNLTQ1

Name: LM53625LQRNLTQ1
Brand: Texas Instruments
SKU: LM53625LQRNLTQ1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM53625LQRNLTQ1

Manufacturer:: Texas Instruments

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 22-PowerVFQFN

Datasheet:: LM53625LQRNLTQ1.pdf

Description:: IC REG BUCK 5V 2.5A 22VQFN

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Product details

Overview

LM53625LQRNLTQ1 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 in light-load mode - deployed in telematics head units requiring compact, low-EMI power regulation.

For engineers reviewing the LM53625LQRNLTQ1 datasheet, LM53625LQRNLTQ1 pinout, LM53625LQRNLTQ1 application, or LM53625LQRNLTQ1 equivalent, this page delivers verified package mapping (VQFN-HR, 5.0 × 4.0 mm), confirmed thermal specs (R_θJA = 29.4°C/W), validated spread-spectrum EMI reduction, and real-world automotive timing behavior including 3-ms RESET release and 2–5 ms soft-start.

Technical Context

The LM53625LQRNLTQ1 implements peak-current-mode control with adaptive frequency spreading to maintain regulation down to 300-mV dropout at 3.5 A while preserving 2.1-MHz operation across wide VIN–VOUT ratios - enabling 18 V → 3.3 V conversion without duty-cycle collapse. Its HotRod QFN package integrates wettable flanks and split PGND pins to minimize parasitic inductance, reducing switch-node ringing and radiated EMI.

It features integrated 3.1-V LDO (VCC), bootstrap gate drive (CBOOT), open-drain RESET with internal 12–45 µs glitch filter and 3-ms release timer, and FPWM pin for forced PWM mode override - all operating across –40°C to +150°C junction temperature with AEC-Q100 HBM ±2500 V and CDM ±1000 V ESD ratings.

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 core rail without external feedback divider.
Max Output Current	2.5 A continuous - supports dual-core automotive microcontrollers and display controllers in head units.
Input Voltage Range	3.9 V to 36 V, with 42-V transient tolerance ≤500 ms - eliminates need for upstream surge protection in 12-V/24-V vehicle systems.
Switching Frequency	2.1 MHz nominal, ±3% spread-spectrum option - places fundamental and harmonics above AM band, 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 telematics modules without battery drain.
Thermal Resistance	R_θJA = 29.4°C/W (VQFN-HR) - supports 2.5-A operation at +105°C ambient with standard 2-layer PCB layout.
RESET Function	Open-drain output with 105–110% rising threshold, 92–96.5% falling threshold, and 3-ms release delay - replaces discrete supervisor IC in instrumentation clusters.

Pinout & Package

VQFN-HR (RNL) 22-pin package, 5.0 mm × 4.0 mm body, 0.6-mm pitch, with wettable flanks - optimized for automated optical inspection and high-current PCB routing.

Pin/Terminal	Circuit Role	Design Meaning
VCC (Pin 1)	Internal LDO output	Supplies 3.1 V to internal control logic; 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 reliable turn-on.
SYNC (Pin 3)	Frequency synchronization input	Accepts 1.9–2.3 MHz external clock (rising-edge triggered); enables system-level timing coherence.
PVIN1/PVIN2 (Pins 4,14)	Main power input	Parallel input paths reduce IR drop; must be shorted together on PCB with local ceramic bypassing.
SW (Pin 9)	Switch node	Connects directly to power inductor; high di/dt path requiring tight loop area to minimize EMI.
PGND1/PGND2 (Pins 5–8,10–13)	Power ground return	Eight dedicated low-inductance GND pins - split into two groups to isolate high- and low-side return currents.
FPWM (Pin 16)	Forced PWM mode control	Logic-high disables light-load diode emulation, enforcing constant 2.1-MHz switching for predictable EMI profile.
EN (Pin 18)	Enable input	Active-high (1.7–2.0 V threshold); internal hysteresis prevents chatter during slow-rising battery rails.
RESET (Pin 19)	Open-drain fault flag	Asserts low on UVLO, thermal shutdown, or EN deactivation; includes internal 12–45 µs glitch filter.
FB (Pin 21)	Feedback reference	Internally tied to 5-V output; unused in fixed-output variants - simplifies layout and reduces BOM count.
BIAS (Pin 22)	Auxiliary bias supply	Connected to output rail to improve efficiency and reduce dropout at light loads.

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 front-end infotainment and ADAS power rails.
Low-EMI HotRod packaging	VQFN-HR with wettable flanks and split PGND - reduces switch-node ringing by >50% vs standard QFN, easing CISPR-25 compliance.
Integrated RESET with filtering	Programmable 3-ms release timer and 12–45 µs glitch rejection - eliminates external RC network and supervisory IC in cluster designs.
Adaptive frequency spreading	±3% modulation activated near dropout - maintains 2.1-MHz base frequency while extending duty cycle to 98% for ultra-low VIN operation.
Built-in compensation & protection	No external compensation required; includes soft-start (2–5 ms), thermal shutdown (155–175°C), UVLO, and hiccup-mode short-circuit recovery.

Applications

Telematics Module Power	Head Unit Core Rail
Use Scenario: Powers LTE modem, GNSS receiver, and CAN interface in connected car telematics control unit under cold-crank (4.5 V) and load-dump (42 V) conditions. IC Role / Device Role / Timing Role: Primary 5-V buck regulator with spread-spectrum EMI control and RESET signaling to host MCU. Use Value: 15-µA quiescent current extends battery life during sleep; 2.1-MHz switching allows use of 2.2-µH inductors < 3 mm tall.	Use Scenario: Supplies 5-V rail to ARM Cortex-A53 application processor and display controller in infotainment head unit with dynamic load steps up to 2 A. IC Role / Device Role / Timing Role: High-efficiency synchronous step-down converter with FPWM override for deterministic transient response. Use Value: 90% peak efficiency at 3.5 A reduces thermal stress; 65-ns minimum on-time supports 18 V → 3.3 V conversion at full frequency.
Instrumentation Cluster Display	Automotive Camera Interface
Use Scenario: Regulates 5-V supply for TFT-LCD driver IC and touch controller in digital instrument cluster with ambient temperature up to +105°C. IC Role / Device Role / Timing Role: Fixed-output buck converter with integrated RESET to validate power integrity before boot sequence. Use Value: ±1% output tolerance ensures consistent gamma correction; R_θJA = 29.4°C/W enables 2.5-A operation on 2-layer board without heatsink.	Use Scenario: Provides clean 5-V rail to MIPI CSI-2 image sensor and serializer in rear-view camera module exposed to engine bay temperatures. IC Role / Device Role / Timing Role: Automotive-grade DC-DC with low EMI and robust thermal shutdown (155°C trip) for safety-critical vision systems. Use Value: Wettable-flank VQFN enables AOI verification; 42-V transient tolerance eliminates need for TVS diode on input.

Telematics Module Power

Head Unit Core Rail

Use Scenario: Powers LTE modem, GNSS receiver, and CAN interface in connected car telematics control unit under cold-crank (4.5 V) and load-dump (42 V) conditions.

IC Role / Device Role / Timing Role: Primary 5-V buck regulator with spread-spectrum EMI control and RESET signaling to host MCU.

Use Value: 15-µA quiescent current extends battery life during sleep; 2.1-MHz switching allows use of 2.2-µH inductors < 3 mm tall.

Use Scenario: Supplies 5-V rail to ARM Cortex-A53 application processor and display controller in infotainment head unit with dynamic load steps up to 2 A.

IC Role / Device Role / Timing Role: High-efficiency synchronous step-down converter with FPWM override for deterministic transient response.

Use Value: 90% peak efficiency at 3.5 A reduces thermal stress; 65-ns minimum on-time supports 18 V → 3.3 V conversion at full frequency.

Instrumentation Cluster Display

Automotive Camera Interface

Use Scenario: Regulates 5-V supply for TFT-LCD driver IC and touch controller in digital instrument cluster with ambient temperature up to +105°C.

IC Role / Device Role / Timing Role: Fixed-output buck converter with integrated RESET to validate power integrity before boot sequence.

Use Value: ±1% output tolerance ensures consistent gamma correction; R_θJA = 29.4°C/W enables 2.5-A operation on 2-layer board without heatsink.

Use Scenario: Provides clean 5-V rail to MIPI CSI-2 image sensor and serializer in rear-view camera module exposed to engine bay temperatures.

IC Role / Device Role / Timing Role: Automotive-grade DC-DC with low EMI and robust thermal shutdown (155°C trip) for safety-critical vision systems.

Use Value: Wettable-flank VQFN enables AOI verification; 42-V transient tolerance eliminates need for TVS diode on input.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM536253QRNLTQ1	Fixed 3.3-V output, same 2.5-A rating and package - lacks spread-spectrum feature.	Suitable for 3.3-V FPGA I/O or USB PHY rails where EMI margin is less constrained.	Select when system requires 3.3 V and spread-spectrum is unnecessary; identical footprint and thermal performance.
LM53635LQRNLTQ1	Same 5-V fixed output and spread-spectrum, but rated for 3.5-A max load and higher current limits (HS: 4.5–6 A).	Required for high-current applications like radar SoCs or multi-display head units exceeding 2.5 A.	Choose for future-proofing or higher load headroom; pin-compatible but larger thermal footprint due to increased power dissipation.

Compared with LM536253QRNLTQ1 and LM53635LQRNLTQ1, the LM53625LQRNLTQ1 provides optimal balance of EMI suppression, 5-V output accuracy, and thermal efficiency for mid-power automotive domains - offering spread-spectrum capability absent in the 3.3-V variant and lower thermal overhead than the 3.5-A version.

Availability

LM53625LQRNLTQ1 is available at Aetrix Electronics and suitable for telematics modules, head unit core rails, instrumentation cluster displays, and automotive camera interfaces requiring stable component supply with AEC-Q100 compliance and long-term automotive lifecycle support.

Supply support for LM53625LQRNLTQ1 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 reliability, thermal robustness, and system-level EMI reduction.

FAQ

What is the maximum input voltage the LM53625LQRNLTQ1 can withstand during transients?

The LM53625LQRNLTQ1 supports 42 V transients at the PVIN pins for durations ≤500 ms and duty cycle ≤0.01%, per its absolute maximum ratings. This enables direct connection to 24-V vehicle batteries without external transient voltage suppressors in most automotive architectures. The device remains functional during cold-crank (down to 3.9 V) and load-dump events, making it suitable for front-end power stages in telematics and head units where LM53625LQRNLTQ1 serves as the primary 5-V regulator.

Does the LM53625LQRNLTQ1 require external compensation components?

No, the LM53625LQRNLTQ1 features fully integrated compensation - no external Type-II or Type-III compensation network is needed. Its internal error amplifier and PWM comparator are factory-tuned for stability with standard 2.2-µH inductors and 22-µF output capacitors. This simplifies design, reduces BOM count, and improves repeatability across production batches. Engineers using LM53625LQRNLTQ1 benefit from plug-and-play operation while retaining full control over soft-start time, FPWM mode, and SYNC input.

How does the RESET function of the LM53625LQRNLTQ1 behave during startup and fault conditions?

The LM53625LQRNLTQ1's open-drain RESET pin asserts low until the output reaches 105–110% of nominal 5 V and remains stable for ≥3 ms, then releases high. It reasserts low on EN deactivation, UVLO, or thermal shutdown. Internal 12–45 µs glitch filtering prevents false triggers from noise. This behavior replaces discrete supervisors in instrumentation clusters, ensuring host MCU only boots after LM53625LQRNLTQ1 achieves valid regulation - critical for fail-safe automotive software initialization.

Can the LM53625LQRNLTQ1 operate with input voltage below 3.9 V?

Yes - the LM53625LQRNLTQ1 supports minimum input voltage of 3.55 V (typical) for full functionality at 1.5 A load, and 3.9 V at full 2.5-A load, per Section 7.6 of the datasheet. Below 3.55 V, dropout behavior begins: switching frequency spreads and duty cycle increases to maintain regulation, reaching up to 98% at 300-mV dropout. This enables operation during severe cold-crank events where battery voltage dips to ~3.6 V, a key requirement for LM53625LQRNLTQ1 deployment in always-on telematics modules.

What is the purpose of the BIAS pin on the LM53625LQRNLTQ1, and how should it be connected?

The BIAS pin on the LM53625LQRNLTQ1 supplies auxiliary bias to the internal LDO and gate drivers, improving efficiency and reducing dropout voltage at light loads. It must be connected directly to the 5-V output rail - not to input or ground. This configuration lowers internal power losses and enables the 15-µA quiescent current spec. Incorrect BIAS connection (e.g., left floating or tied to VIN) causes excessive IQ and potential instability. For LM53625LQRNLTQ1 designs, BIAS-to-VOUT routing is mandatory per TI layout guidelines.

LM53625LQRNLTQ1 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 ~ 125°C (TA)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount, Wettable Flank

Supplier Device Package:: 22-VQFN-HR (5x4)

LM53625LQRNLTQ1 FAQ

1.How can I place an order for LM53625LQRNLTQ1 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM53625LQRNLTQ1 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 LM53625LQRNLTQ1 reliable?

The price and inventory of LM53625LQRNLTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM53625LQRNLTQ1 is usually 5 days.

3.What payment methods are accepted for LM53625LQRNLTQ1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM53625LQRNLTQ1 transactions.

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4.How is shipping managed for LM53625LQRNLTQ1?

LM53625LQRNLTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM53625LQRNLTQ1 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 LM53625LQRNLTQ1?

For technical support, including LM53625LQRNLTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM53625LQRNLTQ1 requirements.

6.How does Aetrix verify that LM53625LQRNLTQ1 is sourced from the original manufacturer or authorized distributors?

All LM53625LQRNLTQ1 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 LM53625LQRNLTQ1 meets industry standards.

7.What is the process for return or replacement of LM53625LQRNLTQ1?

All LM53625LQRNLTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM53625LQRNLTQ1, 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 LM53625LQRNLTQ1 part is unused and in its original packaging.

Return procedure for LM53625LQRNLTQ1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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