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Texas Instruments LM76003QRNPTQ1
- Part No.:
- LM76003QRNPTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 30-WFQFN Exposed Pad
- Datasheet:
-
LM76003QRNPTQ1.pdf
- Description:
- IC REG BUCK ADJ 3.5A 30WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:291
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Product details
Overview
LM76003QRNPTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive 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-used in infotainment systems, EV camera power rails, and hybrid vehicle control modules.
For engineers reviewing the LM76003QRNPTQ1 datasheet, LM76003QRNPTQ1 pinout, LM76003QRNPTQ1 application, or LM76003QRNPTQ1 equivalent, key selection considerations include its 30-pin WQFN wettable-flank package, peak-current-mode control architecture, 300 kHz–2.2 MHz adjustable switching frequency, FPWM/DCM mode selectability, and integrated power-good flag for automotive system monitoring.
Technical Context
The LM76003QRNPTQ1 employs fixed-frequency peak-current-mode control with internal compensation, enabling stable regulation across wide VIN–VOUT ratios while minimizing external component count. Its tON-MIN = 65 ns and tOFF-MIN = 95 ns support ultra-wide conversion ranges-including 24 V-to-3.3 V and 12 V-to-5 V-without requiring external frequency foldback circuitry.
It integrates dual NMOS power switches (RDS(on)HS = 95–150 mΩ, RDS(on)LS = 45–85 mΩ), a precision 1.006 V feedback reference (±1.3% over temperature), and configurable light-load operation: DCM/PFM for efficiency optimization or forced-PWM for EMI-sensitive applications via SYNC/MODE pin logic levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 60 V - supports direct battery connection in 12 V/24 V/48 V automotive architectures without pre-regulation. |
| Output Current | Up to 3.5 A - sufficient for powering SoCs, image sensors, and display controllers in ADAS camera modules. |
| Quiescent Current | 15 µA in regulation - enables always-on functionality in low-power vehicle subsystems without excessive battery drain. |
| Switching Frequency | 300 kHz to 2.2 MHz - selectable via RT resistor or external clock; higher frequencies allow smaller magnetics and reduced solution footprint. |
| Feedback Reference | 1.006 V ±1.3% - enables precise output voltage setting (e.g., 5.0 V ±1%) using standard 1% resistors in FB divider network. |
| Thermal Resistance | RθJA = 29.6 °C/W - validated for 6 mm × 4 mm WQFN package with thermal vias and PCB copper pour, supporting 3.5 A continuous load at +85°C ambient. |
| Protection Features | Cycle-by-cycle current limit, hiccup-mode short-circuit protection, thermal shutdown at 160°C, and input UVLO - ensures robust operation in harsh automotive environments. |
Pinout & Package
LM76003QRNPTQ1 uses a 30-pin WQFN (RNP) package with 6.00 mm × 4.00 mm body size and wettable flanks for automated optical inspection (AOI) and enhanced thermal performance. The exposed die attach pad (DAP) must be soldered to system ground for optimal heat dissipation and EMI suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (1,2,3,4,5) | Power input supply rail | Primary high-voltage input path to internal bias LDO and HS FET; requires local CIN placement with minimal loop area to PGND. |
| SW (1,2,3,4,5) | Switch node | Internally connects HS FET source and LS FET drain; drives external inductor and boot capacitor; critical for EMI layout. |
| BOOT (6) | Bootstrap supply | Connects 470 nF ceramic capacitor to SW; supplies gate drive voltage for HS FET during on-time. |
| FB (12) | Voltage feedback input | Senses output via resistor divider; 1.006 V reference sets VOUT = 1.006 × (1 + RFBT/RFBB); avoid grounding during operation. |
| PGOOD (16) | Open-drain power-good flag | Signals regulation status (high = OK, low = fault); requires external pull-up; asserts low during EN = low or FB undervoltage/overvoltage. |
| SYNC/MODE (17) | Mode control & sync input | Configures operation: grounded = DCM/PFM; logic high = FPWM; external clock = synchronization; rising-edge triggered. |
| EN (18) | Precision enable | Logic-controlled startup with hysteresis (VEN_H = 1.204 V, VEN_L = 1.054 V); supports adjustable UVLO via external resistor divider. |
| AGND (13,14,15) | Analog ground reference | Reference for FB, RT, SS/TRK, PGOOD; must connect to system ground with low-impedance path separate from PGND return. |
| PGND (20,21,22,24,25,26) | Power ground return | Source of LS FET; connects to CIN/COUT ground, DAP, and inductor ground; requires shortest possible trace to PVIN and SW. |
| DAP/EP | Exposed thermal pad | Low-impedance connection to AGND; mandatory for thermal management and EMI reduction; requires ≥9 thermal vias to inner ground plane. |
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-meets automotive reliability requirements. |
| Integrated synchronous rectification | Eliminates external Schottky diode; reduces conduction loss and improves full-load efficiency by up to 8% versus asynchronous designs. |
| Adjustable soft-start (6.3 ms default) | Prevents inrush current during startup; external capacitor on SS/TRK extends ramp time linearly-critical for sequencing-sensitive loads. |
| Power-good flag with UV/OV detection | Monitors FB voltage within ±10% window (86–113% of VREF); provides system-level fault signaling without external comparators. |
| External BIAS supply option | Accepts 3.3 V or 5 V external rail on BIAS pin to reduce internal LDO losses-improves light-load efficiency by >2% when VOUT ≥ 3.3 V. |
Applications
| Camera Power Supply | Infotainment System Rail |
|---|---|
Use Scenario: Powers 5 MP CMOS image sensor and ISP in rear-view or surround-view camera module. IC Role / Device Role / Timing Role: Primary 3.3 V/2.8 V step-down regulator with pre-bias start-up and output voltage tracking capability. Use Value: 15 µA quiescent current enables always-on wake-on-motion functionality; wettable-flank WQFN ensures AOI-compatible assembly in high-volume automotive production. |
Use Scenario: Supplies 5 V rail to touch controller, audio codec, and display interface in dashboard infotainment head unit. IC Role / Device Role / Timing Role: Main DC-DC converter with FPWM mode enabled to maintain constant 2.2 MHz switching frequency for predictable EMI filtering. Use Value: 300 kHz–2.2 MHz programmability allows optimization for compact 2-layer PCB layout; PGOOD flag synchronizes MCU boot sequence. |
| Hybrid Vehicle Control Module | Electric Vehicle Battery Management Interface |
Use Scenario: Generates isolated 3.3 V supply for CAN transceiver and microcontroller in 48 V mild-hybrid engine control unit. IC Role / Device Role / Timing Role: High-input-voltage buck regulator operating from 48 V bus with input UVLO set to 32 V to prevent brownout during regenerative braking. Use Value: 60 V max input rating eliminates need for front-end TVS clamping; cycle-by-cycle current limit protects against transient overloads during motor actuation. |
Use Scenario: Powers analog front-end and isolation barrier in cell voltage monitoring IC for 800 V EV battery pack. IC Role / Device Role / Timing Role: Intermediate 12 V rail generator stepping down from 400 V–800 V main bus via auxiliary converter, feeding downstream isolated DC-DC. Use Value: Wide 3.5 V–60 V input range accommodates variable auxiliary supply voltages; thermal shutdown at 160°C prevents failure during sustained high-temperature battery operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM76002QRNPTQ1 | Lower 2.5 A output current rating; identical pinout, package, and feature set except reduced current limit (4.2 A HS vs. 5.5 A). | Suitable for lower-power camera modules or sensor nodes where 3.5 A headroom is unnecessary. | Select when design load stays ≤2.2 A and cost sensitivity outweighs future-proofing margin. |
| TPS543620RTWR | 3.5 A rating, 4.5–60 V input, but uses current-mode control with external compensation; lacks integrated PGOOD and BIAS pin. | Requires additional components for power-good signaling and has no dedicated bias input for efficiency optimization. | Choose only if existing design already uses TPS543620 and board space allows added compensation network and discrete PGOOD circuit. |
Compared with LM76002QRNPTQ1, the LM76003QRNPTQ1 delivers 40% higher output current in identical footprint and pinout-enabling upgrade paths without PCB revision. Versus TPS543620RTWR, it reduces BOM count by integrating PGOOD, BIAS, and soft-start while improving light-load efficiency through automatic PFM/FPWM transition.
Availability
LM76003QRNPTQ1 is available at Aetrix Electronics and suitable for automotive camera systems, infotainment head units, and hybrid vehicle control modules requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LM76003QRNPTQ1 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 solutions with over 50 years of industry experience.
The LM7600x-Q1 product line was designed specifically for automotive power conversion-emphasizing AEC-Q100 compliance, extended temperature operation, and robust protection features for safety-critical vehicle subsystems.
FAQ
What is the maximum input voltage rating for the LM76003QRNPTQ1?
The LM76003QRNPTQ1 supports a recommended operating input voltage range of 3.5 V to 60 V, with an absolute maximum rating of 65 V on the PVIN pin. Exceeding 60 V continuously may trigger overvoltage protection or reduce long-term reliability; operation above 60 V should be limited to transient conditions per the datasheet's absolute maximum ratings table.
Does the LM76003QRNPTQ1 support output voltage tracking?
Yes, the LM76003QRNPTQ1 supports output voltage tracking via the SS/TRK pin. When connected to an external voltage ramp (e.g., from another regulator's soft-start node), the LM76003QRNPTQ1's output follows that ramp, enabling coordinated power-up sequencing in multi-rail systems such as infotainment processors with core and I/O supplies.
How does the BIAS pin improve efficiency in the LM76003QRNPTQ1?
The BIAS pin on the LM76003QRNPTQ1 accepts an external 3.3 V or 5 V supply to power internal circuitry, bypassing the internal VCC LDO. This reduces conduction loss in the bias regulator-especially beneficial when VOUT is ≥3.3 V-yielding up to 2.5% higher light-load efficiency compared to self-biased operation.
What thermal management practices are required for full 3.5 A operation of the LM76003QRNPTQ1?
To sustain 3.5 A continuous output at +85°C ambient, the LM76003QRNPTQ1 requires its exposed DAP pad to be soldered to a minimum 200 mm² internal or external ground copper plane with ≥9 thermal vias (0.3 mm diameter, 0.5 mm pitch). Board layout must minimize PGND loop inductance and ensure airflow or heatsinking per TI's thermal design guidelines in Section 10.3 of the datasheet.
Can the LM76003QRNPTQ1 operate with pre-biased outputs during startup?
Yes, the LM76003QRNPTQ1 supports start-up into a pre-biased output condition. Its valley-current detection and controlled soft-start ramp prevent reverse current flow and output overshoot, making it suitable for hot-swap or redundant power supply applications common in automotive domain controllers and gateway ECUs.
LM76003QRNPTQ1 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)
LM76003QRNPTQ1 FAQ
1.How can I place an order for LM76003QRNPTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM76003QRNPTQ1 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 LM76003QRNPTQ1 reliable?
The price and inventory of LM76003QRNPTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM76003QRNPTQ1 is usually 5 days.
3.What payment methods are accepted for LM76003QRNPTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM76003QRNPTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM76003QRNPTQ1?
LM76003QRNPTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM76003QRNPTQ1 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 LM76003QRNPTQ1?
For technical support, including LM76003QRNPTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM76003QRNPTQ1 requirements.
6.How does Aetrix verify that LM76003QRNPTQ1 is sourced from the original manufacturer or authorized distributors?
All LM76003QRNPTQ1 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 LM76003QRNPTQ1 meets industry standards.
7.What is the process for return or replacement of LM76003QRNPTQ1?
All LM76003QRNPTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM76003QRNPTQ1, 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 LM76003QRNPTQ1 part is unused and in its original packaging.
Return procedure for LM76003QRNPTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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