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Texas Instruments LM76003QRNPRQ1
- Part No.:
- LM76003QRNPRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 30-WFQFN Exposed Pad
- Datasheet:
-
LM76003QRNPRQ1.pdf
- Description:
- IC REG BUCK ADJ 3.5A 30WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
LM76003QRNPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified synchronous step-down DC-DC converter delivering up to 3.5 A output current, supporting 3.5 V to 60 V input range and 1 V to 95% VIN adjustable output voltage, with 15 µA quiescent current in regulation and integrated power-good flag - used in automotive infotainment and camera power rails.
For engineers reviewing the LM76003QRNPRQ1 datasheet, LM76003QRNPRQ1 pinout, LM76003QRNPRQ1 application, or LM76003QRNPRQ1 equivalent, key selection criteria include its 30-pin WQFN package with wettable flanks, 300 kHz–2.2 MHz adjustable switching frequency, FPWM/DCM mode selectability, thermal shutdown at 160°C, and cycle-by-cycle current limiting for robust automotive operation.
Technical Context
The LM76003QRNPRQ1 employs fixed-frequency peak-current-mode control with internal compensation, enabling stable regulation across wide input/output ranges without external loop components. It supports automatic frequency foldback below tON-MIN = 65 ns or tOFF-MIN = 95 ns to maintain regulation at extreme duty cycles.
Its system-level architecture integrates a precision enable input (VEN_VOUT_H = 1.204 V), adjustable soft-start (6.3 ms default), SYNC/MODE pin for external clock synchronization or FPWM/DCM selection, and BIAS pin for optional external bias supply to improve light-load efficiency - all implemented in a single monolithic IC with integrated high-side and low-side NMOS FETs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 60 V - supports wide automotive battery transients including cold-crank (3.5 V) and load-dump (60 V) |
| Output Current | Up to 3.5 A - sufficient for powering dual-core SoCs or multi-sensor camera modules |
| Quiescent Current | 15 µA in regulation - enables always-on systems with minimal battery drain |
| Switching Frequency | 300 kHz to 2.2 MHz - selectable via RT resistor or external SYNC clock for EMI optimization |
| Thermal Shutdown | 160°C threshold with 135°C hysteresis - protects against sustained overload or poor heatsinking |
| Current Limit | High-side: 4.35–5.5 A (typ–max); Low-side: 3.4–4.2 A - ensures safe operation under short-circuit conditions |
| Feedback Reference | 1.006 V ±11 mV - enables precise output voltage setting with <±1% accuracy over temperature |
| Package | 30-pin WQFN (6.0 mm × 4.0 mm) with wettable flanks - supports automated optical inspection and improves thermal dissipation |
Pinout & Package
The LM76003QRNPRQ1 is housed in a 30-pin WQFN package (6.00 mm × 4.00 mm) with exposed thermal pad (DAP) connected internally to AGND, requiring PCB soldering to ground plane with thermal vias for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pins 1–5, 21–22, 26) | Switch node | Internally connects HS FET source and LS FET drain; drives external inductor and boot capacitor |
| BOOT (Pin 6) | Bootstrap supply | Provides gate drive voltage for HS FET; requires 470-nF ceramic capacitor to SW |
| PGOOD (Pin 16) | Open-drain status flag | Asserts high when VOUT is within ±5% of target; sinks current during fault or EN = low |
| EN (Pin 18) | Precision enable input | Turns regulator on above 1.204 V; supports adjustable UVLO via external resistor divider |
| FB (Pin 12) | Voltage feedback input | Senses output via resistor divider; regulates VOUT to 1.006 V reference with ±11 mV tolerance |
| RT (Pin 10) | Frequency set input | Resistor-to-ground sets fSW; open = 500 kHz default; 17.4 kΩ = 2.2 MHz max |
| SYNC/MODE (Pin 17) | Mode control & sync input | Ground = DCM/PFM; logic high = FPWM; external clock = synchronized FPWM |
| BIAS (Pin 9) | Optional bias supply | Tie to VOUT (3.3–18 V) or external 3.3/5 V rail to reduce power loss in internal LDO |
| SS/TRK (Pin 11) | Soft-start & tracking | Internal 2 µA current charges external cap for programmable ramp; also accepts external tracking voltage |
| AGND (Pins 13–15) | Analog ground reference | Reference for FB, EN, PGOOD, and internal references; must be star-connected to PGND at single point |
| PGND (Pins 20, 24–25) | Power ground return | Source connection for LS FET; requires low-inductance path to CIN and COUT grounds |
| PVIN (Pins 20, 21, 22) | Main power input | Supplies HS FET and internal bias LDO; requires local 10–22 µF ceramic CIN placed adjacent to pins |
| VCC (Pin 8) | Internal LDO output | 3.29 V supply for control circuitry; requires 2.2 µF ceramic capacitor to AGND; no external loading |
| NC (Pins 7, 19, 23, 27–30) | No-connect | Not internally bonded; connect to ground copper for thermal relief and EMI reduction |
| DAP/EP | Exposed thermal pad | Internally tied to AGND; must be soldered to PCB ground plane with ≥9 thermal vias for RθJB = 9.1°C/W |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with HBM ±2 kV / CDM ±750 V ESD robustness |
| Integrated synchronous rectification | Eliminates external Schottky diode; achieves >95% peak efficiency at 12 VIN/5 VOUT/2 A |
| Adjustable soft-start (6.3 ms default) | Prevents inrush current during startup; extended via external capacitor on SS/TRK pin |
| Power-good flag with deglitching | 80–200 µs deglitch on PGOOD rising/falling edges prevents false fault assertions during transients |
| Pin-selectable FPWM operation | Ensures constant switching frequency under all loads - critical for EMI-sensitive automotive radar systems |
| Automated frequency foldback | Maintains regulation at ultra-low duty cycles by reducing fSW when tON-MIN or tOFF-MIN limits are reached |
Applications
| Camera Power Supply | Infotainment System Rail |
|---|---|
Use Scenario: Powering 5 MP automotive surround-view camera module with MIPI CSI-2 interface and image signal processor. IC Role / Device Role / Timing Role: Primary 3.3 V/2.5 A buck regulator supplying sensor, ISP, and serializer; tracks master system rail during hot-plug events. Use Value: 15 µA quiescent current extends battery life in parked surveillance mode; PGOOD confirms stable imaging voltage before frame capture. | Use Scenario: Generating 1.1 V core voltage for ARM Cortex-A72 application processor in digital cluster display. IC Role / Device Role / Timing Role: High-efficiency synchronous buck delivering 3.5 A with FPWM mode enabled to avoid AM-band interference. Use Value: 300 kHz–2.2 MHz frequency adjustability allows EMI filtering optimization; thermal shutdown protects against prolonged CPU load spikes. |
| ADAS Domain Controller | EV Battery Management Interface |
Use Scenario: Providing isolated 5 V auxiliary supply for CAN FD transceivers and safety monitoring microcontrollers. IC Role / Device Role / Timing Role: Secondary regulated rail derived from 12 V vehicle bus; synchronized to main system clock to minimize jitter coupling. Use Value: SYNC/MODE pin enables deterministic timing alignment; 60 V absolute max input withstands EV battery transient surges. | Use Scenario: Powering isolated ADC and isolator circuits in high-voltage battery pack monitoring unit. IC Role / Device Role / Timing Role: Input-supply tolerant buck converting 48 V nominal battery voltage down to 3.3 V for analog front-end. Use Value: Wide 3.5–60 V input range accommodates full EV battery SOC swing (35–58 V); BIAS pin improves efficiency at partial charge states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61460-Q1 | Lower 3.0-A output rating; 40-V max input; 20-µA IQ; 2.1-MHz max fSW | Better suited for compact space-constrained modules where 3.5-A headroom is unnecessary | Select LM61460-Q1 when board area is critical and load current remains ≤3.0 A |
| TPS543B20 | 30-V max input; 3-A output; PMBus interface; 10-µA IQ; 1.8-MHz max fSW | Requires digital configuration; lacks AEC-Q100 Grade 1 qualification and automotive temp range | Choose TPS543B20 only for non-automotive industrial designs needing telemetry and remote tuning |
Compared with LM61460-Q1 and TPS543B20, the LM76003QRNPRQ1 provides higher output current (3.5 A vs 3.0 A/3.0 A), wider input range (60 V vs 40 V/30 V), and full AEC-Q100 Grade 1 compliance - making it the only option qualified for direct integration into ASIL-B power domains.
Availability
LM76003QRNPRQ1 is available at Aetrix Electronics and suitable for automotive camera systems, infotainment head units, ADAS domain controllers, and EV battery interface modules requiring stable component supply across extended temperature and long production lifecycles.
Supply support for LM76003QRNPRQ1 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 power management ICs, with deep expertise in automotive-grade reliability and functional safety.
The LM7600x-Q1 product line delivers high-voltage synchronous buck regulators optimized for automotive subsystems requiring AEC-Q100 qualification, wide input range, and robust thermal performance in compact WQFN packages.
FAQ
What is the maximum input voltage rating for the LM76003QRNPRQ1?
The LM76003QRNPRQ1 has an absolute maximum input voltage rating of 65 V on the PVIN pin, with recommended operating range from 3.5 V to 60 V. This allows reliable operation during automotive load-dump events and across full EV battery voltage ranges. The device incorporates input undervoltage lockout and overvoltage protection circuitry to safeguard internal circuitry under abnormal supply conditions. Always observe derating guidelines per TI's thermal design recommendations when operating near maximum ratings.
Does the LM76003QRNPRQ1 support output voltage tracking?
Yes, the LM76003QRNPRQ1 supports output voltage tracking via the SS/TRK pin. When an external voltage ramp is applied to this pin, the internal soft-start circuit follows that reference, allowing coordinated power-up sequencing with other rails in multi-rail systems. This capability is essential for FPGA, SoC, and memory subsystems where strict voltage ramp order prevents latch-up or damage. Tracking behavior is confirmed in the device's functional description and typical application schematics in the official datasheet.
How does the BIAS pin improve efficiency in the LM76003QRNPRQ1?
The BIAS pin on the LM76003QRNPRQ1 allows connection to an external 3.3-V or 5-V supply (or to VOUT if 3.3 V ≤ VOUT ≤ 18 V), bypassing the internal VCC LDO and reducing power loss. When active, it lowers total quiescent current - especially beneficial at light loads - and improves overall conversion efficiency by up to 3% at 100-mA output. TI specifies a 1-µF capacitor to ground on the BIAS pin when used, and recommends tying it to ground if unused. This feature is validated in the Electrical Characteristics table under IBIAS_NONSW and IBIAS_SW parameters.
What thermal metrics apply to the LM76003QRNPRQ1 in its WQFN package?
The LM76003QRNPRQ1 in the 30-pin WQFN package has RθJA = 29.6°C/W (junction-to-ambient), RθJC(bot) = 1.0°C/W (junction-to-case bottom), and RθJB = 9.1°C/W (junction-to-board). These values assume proper PCB layout: soldered DAP/EP to solid ground plane with ≥9 thermal vias, short low-inductance PGND paths, and adequate copper area. Thermal performance is further enhanced by the wettable flanks design, enabling AOI verification of solder joint integrity - critical for automotive manufacturing traceability.
Can the LM76003QRNPRQ1 operate in forced PWM mode across all load conditions?
Yes, the LM76003QRNPRQ1 can be configured for forced PWM (FPWM) operation using the SYNC/MODE pin. When pulled high (≥0.42 V), the device maintains constant switching frequency regardless of load, eliminating audible noise and ensuring predictable EMI profiles - vital for radar and audio-sensitive automotive applications. FPWM mode disables automatic frequency foldback and PFM operation, guaranteeing deterministic timing behavior from no-load to full 3.5-A output. This behavior is explicitly defined in the Mode Input Threshold specifications and functional block diagram.
LM76003QRNPRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- 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)
LM76003QRNPRQ1 FAQ
1.How can I place an order for LM76003QRNPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM76003QRNPRQ1 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 LM76003QRNPRQ1 reliable?
The price and inventory of LM76003QRNPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM76003QRNPRQ1 is usually 5 days.
3.What payment methods are accepted for LM76003QRNPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM76003QRNPRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM76003QRNPRQ1?
LM76003QRNPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM76003QRNPRQ1 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 LM76003QRNPRQ1?
For technical support, including LM76003QRNPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM76003QRNPRQ1 requirements.
6.How does Aetrix verify that LM76003QRNPRQ1 is sourced from the original manufacturer or authorized distributors?
All LM76003QRNPRQ1 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 LM76003QRNPRQ1 meets industry standards.
7.What is the process for return or replacement of LM76003QRNPRQ1?
All LM76003QRNPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM76003QRNPRQ1, 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 LM76003QRNPRQ1 part is unused and in its original packaging.
Return procedure for LM76003QRNPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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