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LM76003QRNPRQ1

IC REG BUCK ADJ 3.5A 30WQFN

Part Number: LM76003QRNPRQ1

Manufacturer: Texas Instruments

Category: Voltage Regulators - DC DC Switching Regulators

Package: 30-WFQFN Exposed Pad

Datasheet:: LM76003QRNPRQ1.pdf

Description: IC REG BUCK ADJ 3.5A 30WQFN

Select Quantity Stock: 13,000

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PRODUCT INFORMATION

Product Details

PRODUCT TECHNICAL REFERENCE

LM76003QRNPRQ1 Automotive 3.5V to 60V, 3.5A Synchronous Step-Down Voltage Regulator

A comprehensive technical overview of the LM76003QRNPRQ1, an AEC-Q100 qualified synchronous step-down DC-DC converter from Texas Instruments capable of driving up to 3.5A of load current from an input up to 60V. Features integrated synchronous rectification, 15µA quiescent current, adjustable frequency from 300kHz to 2.2MHz, and 30-pin WQFN package. Covers device function, core features, electrical specifications, pin configuration, typical applications, and replacement selection guidance.

Texas Instruments 30-WQFN (6.00mm × 4.00mm) 3.5V to 60V

Device Classification Synchronous Step-Down DC/DC Converter

Part Number: LM76003QRNPRQ1

Mounting Type: Surface Mount

Operating Temperature Range: -40°C to +125°C

PRODUCT OVERVIEW

What Is the LM76003QRNPRQ1?

LM76003QRNPRQ1 is an easy-to-use synchronous step-down DC-DC converter from Texas Instruments capable of driving up to 3.5A of load current from an input voltage up to 60V. The device is AEC-Q100 qualified for automotive applications with device temperature grade 1: –40°C to +125°C ambient operating temperature.

The LM76003QRNPRQ1 employs peak current-mode control and provides exceptional efficiency and output accuracy in a very small solution size. The device features integrated synchronous rectification, eliminating the need for an external Schottky diode and improving efficiency. The input voltage range is 3.5V to 60V (65V maximum), and the output voltage is adjustable from 1V to 95% V_IN. The quiescent current in regulation is only 15µA.

Additional features such as adjustable switching frequency (300kHz to 2.2MHz), synchronization to an external clock, pin-selectable FPWM operation, power-good flag, precision enable, adjustable soft start (6.3ms default), and tracking provide both flexible and easy-to-use solutions for a wide range of applications. The device requires few external components and has a pinout designed for simple PCB layout with best-in-class EMI (CISPR25) and thermal performance.

Protection features include input undervoltage lockout, thermal shutdown, cycle-by-cycle current limit, and short-circuit protection with hiccup mode. The LM76003QRNPRQ1 is available in a 30-pin WQFN leadless package with wettable flanks, rated for operation from –40°C to +125°C. The device is RoHS compliant (ROHS3) and REACH unaffected.

AEC-Q100 Qualified Automotive-grade qualification with device temperature grade 1: –40°C to +125°C, HBM ESD classification level 2, and CDM ESD classification level C5.

Wide Input Voltage Range 3.5V to 60V input (65V maximum) with output voltage adjustable from 1V to 95% V_IN and 3.5A maximum output current.

Ultra-Low Quiescent Current 15µA quiescent current in regulation with high-efficiency PFM mode at light loads and optional external bias for improved efficiency.

DEVICE HIGHLIGHTS

Key Features and Benefits of LM76003QRNPRQ1

AEC-Q100 Qualified for Automotive

Device temperature grade 1: –40°C to +125°C ambient operating temperature, HBM ESD classification level 2, and CDM ESD classification level C5, making it suitable for harsh automotive environments.

Wide Input Voltage Range

Operates from 3.5V to 60V input (65V maximum), supporting a broad spectrum of automotive and industrial high-voltage applications including telecommunications infrastructure and programmable logic controllers.

Integrated Synchronous Rectification

Integrated high-side and low-side MOSFETs eliminate the need for an external Schottky diode, improving efficiency and reducing solution size.

Adjustable Switching Frequency

Switching frequency adjustable from 300kHz to 2.2MHz using an external resistor on the RT pin. Default frequency is 500kHz when RT is floating. Supports synchronization to an external clock.

High-Efficiency Light-Load Architecture

Automatic frequency foldback and pin-selectable PFM/FPWM operation enable high efficiency at light loads. Optional external bias (BIAS pin) further improves efficiency.

Comprehensive Protection Features

Input undervoltage lockout, cycle-by-cycle current limit, short-circuit protection with hiccup mode, and overtemperature thermal shutdown protection ensure robust operation.

REFERENCE DATA

Technical Specifications for LM76003QRNPRQ1

Part Number	LM76003QRNPRQ1	Manufacturer	Texas Instruments
Device Type	Synchronous Step-Down DC/DC Converter	Topology	Buck
Input Voltage Range (V_IN)	3.5V to 60V (65V Maximum)	Output Voltage Range (V_OUT)	1V to 95% V_IN
Output Current (Max)	3.5A	Switching Frequency Range	300kHz to 2.2MHz (Adjustable)
Default Switching Frequency	500kHz (RT Floating)	Quiescent Current (I_Q)	15µA (Typical, Regulation)
Minimum On-Time (t_ON-MIN)	65ns (Typical)	Minimum Off-Time (t_OFF-MIN)	95ns (Typical)
High-Side Current Limit (LM76003-Q1)	5.5A (Typical)	Control Mode	Peak Current-Mode
Integrated Synchronous Rectification	Yes	External Bias Input	Yes (Optional)
Soft Start (Default)	6.3ms (Internal)	Soft Start (Adjustable)	External Capacitor
Power Good Flag (PGOOD)	Open-Drain Output	External Synchronization	Yes
Light Load Mode	PFM (Pin-Selectable)	Forced PWM Mode	Yes (Pin-Selectable)
Package / Case	30-WQFN (6.00mm × 4.00mm)	Supplier Device Package	30-WQFN (RNP)
Package Body Size	6.00mm × 4.00mm	Pin Count	30
Mounting Type	Surface Mount	Operating Temperature	-40°C to +125°C (Ambient)
AEC-Q100 Qualification	Yes – Grade 1	HBM ESD Classification	Level 2
CDM ESD Classification	Level C5	Lead Finish / Ball Material	NiPdAu / Sn
MSL Level / Peak Reflow	Level-2-260C-1 YEAR	ECCN	EAR99
RoHS	ROHS3 Compliant	REACH Status	REACH Unaffected
Product Status	Active	Packaging	Tape & Reel (3,000 per Reel)

Electrical values shown above are reference values. Test conditions, limits, and guaranteed performance should always be confirmed from the current official manufacturer datasheet before design or production use.

DESIGN REFERENCE

Circuit Considerations for LM76003QRNPRQ1

Frequency, Soft Start & Mode Configuration

The LM76003QRNPRQ1 offers flexible programming via external components:

Switching Frequency (RT Pin): Place a resistor from RT to ground to set the switching frequency from 300kHz to 2.2MHz. If floating, the default switching frequency is 500kHz. Do not short RT to ground.
Soft Start (SS/TRK Pin): Leave floating to use the 6.3ms internal soft-start ramp. Connect an external capacitor to extend the soft-start time. A 2-µA current sourced from this pin charges the capacitor to provide the ramp.
SYNC/MODE Pin: Tie to ground for DCM/PFM operation under light loads (improved efficiency); tie to logic high for forced PWM under light loads; tie to an external clock source for synchronization. Do not float.
BIAS Pin: Optional BIAS LDO supply input. Tie to V_OUT when 3.3V ≤ V_OUT ≤ 18V, or tie to an external 3.3V or 5V rail for improved efficiency. Place a 1-µF capacitor from this terminal to ground. Tie to ground when not in use.
Output Voltage (FB Pin): Connect a resistor divider from V_OUT to FB to set the output voltage. The feedback reference voltage is 1.0V (typical).

PCB and System-Level Guidance

Buck converter performance depends on layout and component selection:

Input Capacitors: Place a 10µF to 22µF high-frequency decoupling capacitor right next to the PVIN and PGND pins and connect with short traces. A bulk input capacitor may be required depending on the application.
BOOT Capacitor: Connect a high-quality 470-nF capacitor from the BOOT pin to the SW pin.
VCC Capacitor: Connect a high-quality 2.2-µF capacitor from the VCC pin to GND. TI does not recommend loading this pin by external circuitry.
Inductor and Output Capacitors: Select based on switching frequency, output current, and ripple requirements using the WEBENCH® Power Designer tool.
Exposed Pad: The exposed thermal pad (DAP/EP) must be soldered to the PCB ground plane for optimal thermal performance.
Verify the recommended PCB footprint from the official datasheet prior to production.

30-LEAD WQFN (6.00mm × 4.00mm)

Pin Configuration Reference for LM76003QRNPRQ1

LM76003

WQFN TOP VIEW

Confirm package orientation and pin numbering against the official package drawing before PCB layout. The WQFN package has 30 pins with a 6.00mm × 4.00mm body size and wettable flanks. The exposed thermal pad must be soldered to the PCB ground plane for optimal thermal performance.

1 SW Switching Output - Connect to Power Inductor and Bootstrap Capacitor

2 SW Switching Output - Connect to Power Inductor

3 SW Switching Output - Connect to Power Inductor

4 SW Switching Output - Connect to Power Inductor

5 SW Switching Output - Connect to Power Inductor

6 BOOT Bootstrap Capacitor Connection - Connect 470-nF Capacitor to SW Pin

7 NC Not Internally Connected - Connect to Ground Copper on PCB

8 VCC Output of Internal Bias Supply - Connect 2.2-µF Capacitor to GND

9 BIAS Optional BIAS LDO Supply Input - Tie to V_OUT (3.3V ≤ V_OUT ≤ 18V) or External 3.3V/5V Rail

10 RT Switching Frequency Setting Pin - Place Resistor to Ground to Set Frequency

11 SS/TRK Soft-Start Control Pin - Leave Floating for 6.3ms Internal Ramp or Connect Capacitor to Extend

12 FB Feedback Input for Output Voltage Regulation - Connect Resistor Divider

13 AGND Analog Ground - Ground Reference for Internal References and Logic

14 AGND Analog Ground

15 AGND Analog Ground

16 PGOOD Open-Drain Power-Good Flag Output - High = V_OUT Regulation OK, Low = V_OUT Regulation Fault

17 SYNC/MODE Synchronization Input and Mode Setting Pin - Do Not Float, Tie to Ground if Not Used

18 EN Precision-Enable Input - High = On, Low = Off; Do Not Float; Can Be Tied to V_IN

19 NC Not Internally Connected - Connect to Ground Copper on PCB

20 PVIN Supply Input to Internal Bias LDO and HS FET - Connect to Input Supply and Input Bypass Capacitors

21 PVIN Supply Input to Internal Bias LDO and HS FET

22 PVIN Supply Input to Internal Bias LDO and HS FET

23 NC Not Internally Connected - Connect to Ground Copper on PCB

24 PGND Power Ground - Connected to Source of LS FET Internally

25 PGND Power Ground

26 PGND Power Ground

27 NC Not Internally Connected - Connect to Ground Copper on PCB

28 NC Not Internally Connected - Connect to Ground Copper on PCB

29 NC Not Internally Connected - Connect to Ground Copper on PCB

30 NC Not Internally Connected - Connect to Ground Copper on PCB

APPLICATION AREAS

Typical Applications for LM76003QRNPRQ1

Telecommunications Infrastructure

Wide input voltage range and high efficiency make this converter ideal for telecom infrastructure power supplies requiring robust performance.

Asset and Fleet Management Systems

AEC-Q100 qualified with low quiescent current, suitable for asset and fleet management systems in automotive and industrial environments.

Video Surveillance

High efficiency and robust protection features suit video surveillance equipment requiring reliable power conversion.

Programmable Logic Controllers (PLCs)

Wide input range and integrated synchronous rectification enable efficient power conversion in industrial PLC applications.

Automotive Power Systems

AEC-Q100 Grade 1 qualified for automotive applications including infotainment, body control modules, and advanced driver assistance systems.

Industrial Power Supplies

Wide 3.5V to 60V input range and 3.5A output current capability support a broad spectrum of industrial power supply designs.

REPLACEMENT GUIDANCE

Selecting an Alternative for LM76003QRNPRQ1

A replacement for the LM76003QRNPRQ1 should not be selected solely by product category. The electrical characteristics, package, and pin configuration must be evaluated against the specific circuit requirements. The following alternatives are documented in the official Texas Instruments product pages and datasheets.

Topology: Synchronous Buck

Input voltage: 3.5V–60V (65V max)

Output current: 3.5A

Output voltage: 1V–95% V_IN

Switching frequency: 300kHz–2.2MHz

Package: 30-WQFN (6mm × 4mm)

Temperature range: –40°C to 125°C (AEC-Q100 Grade 1)

Quiescent current: 15µA (typical)

Pin-to-pin and functionally compatible alternatives (same family, different output current or packaging):

Part Number	Output Current	Package	Compatibility
LM76003QRNPRQ1	3.5A	30-WQFN	-
LM76002QRNPRQ1	2.5A	30-WQFN	Pin-to-Pin Compatible, Lower Output Current
LM76003QRNPTQ1	3.5A	30-WQFN	Same Device, Different Packaging (Tube vs Tape & Reel)

All alternative part numbers listed above are documented in the official Texas Instruments product pages and datasheets. The LM76003QRNPRQ1 is the 3.5A automotive-grade version in a 30-WQFN package with tape-and-reel packaging (3,000 units per reel). The LM76002QRNPRQ1 is a pin-to-pin compatible alternative with lower output current (2.5A). The LM76003QRNPTQ1 is the same device in tube packaging. For higher output current, consider LM76005RNPR. For higher input voltage and spread spectrum for reduced EMI, consider LM65625-Q1. Select based on output current, input voltage, package, and EMI requirements.

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MANUFACTURER INFORMATION

Texas Instruments

The LM76003 (LM76003QRNPRQ1) belongs to the LM76002-Q1/LM76003-Q1 family of easy-to-use synchronous step-down DC-DC converters from Texas Instruments. The device features integrated synchronous rectification, a wide 3.5V to 60V input voltage range, 3.5A output current capability, and a 15µA quiescent current in regulation. The LM76003-Q1 is AEC-Q100 qualified with device temperature grade 1: –40°C to +125°C and is designed for automotive, telecommunications, industrial, and video surveillance applications. The device is available in a 30-pin WQFN package with wettable flanks and is supported by the WEBENCH® Power Designer for custom design creation.

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Technical Information Disclaimer

This technical guide is provided for product identification and preliminary reference only. Electrical limits, package dimensions, pin configuration, product status, and application suitability must be verified using current official manufacturer documentation before design, procurement, or production.

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Specifications

Product Attribute: Attribute Value

Part Number: LM76003QRNPRQ1

Manufacturer: Texas Instruments

Package: 30-WFQFN Exposed Pad

Series: -

Package/Case: 30-WFQFN Exposed Pad

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): 3.5V

Voltage - Input (Max): 60V

Voltage - Output (Min/Fixed): 1V

Voltage - Output (Max): 57V

Current - Output: 3.5A

Frequency - Switching: 300kHz ~ 2.2MHz

Synchronous Rectifier: Yes

Operating Temperature: -40°C ~ 125°C (TJ)

Grade: Automotive

Qualification: AEC-Q100

Mounting Type: Surface Mount, Wettable Flank

Supplier Device Package: 30-WQFN (6x4)

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Part Number: LM76003QRNPRQ1

Manufacturer: Texas Instruments

Package: 30-WFQFN Exposed Pad

Category: Voltage Regulators - DC DC Switching Regulators

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