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Texas Instruments LM76003RNPR
- Part No.:
- LM76003RNPR
- Manufacturer:
- Texas Instruments
- Package:
- 30-WFQFN Exposed Pad
- Datasheet:
-
LM76003RNPR.pdf
- Description:
- IC REG BUCK ADJ 3.5A 30WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,236
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Product details
Overview
LM76003RNPR from Texas Instruments is a 3.5-A synchronous step-down DC-DC converter operating from 3.5 V to 60 V input, delivering regulated output from 1 V to 95% of VIN with peak-current-mode control, 15-µA quiescent current in regulation, and integrated high-side/low-side MOSFETs (RDS(on) = 95 mΩ / 45 mΩ typical). It serves as the primary power stage in industrial and telecom power supplies.
For engineers reviewing the LM76003RNPR datasheet, LM76003RNPR pinout, LM76003RNPR application, or LM76003RNPR equivalent, key selection criteria include its 3.5-A continuous output, 65-ns minimum on-time for wide VIN/VOUT ratios, FPWM/PFM mode selectability, thermal shutdown at 160°C, and WQFN-30 wettable flanks package for EMI-sensitive designs.
Technical Context
The LM76003RNPR employs fixed-frequency peak-current-mode control with internal compensation, enabling stable operation across 300 kHz–2.2 MHz via RT resistor or external SYNC clock. Its architecture supports automatic frequency foldback under tON-MIN/tOFF-MIN constraints and seamless transition between CCM, DCM, and PFM modes.
System-level integration includes precision enable with adjustable UVLO, open-drain PGOOD flag with 86–113% FB threshold hysteresis, adjustable soft-start (6.3 ms default), voltage tracking capability, and optional external BIAS supply for efficiency optimization at 3.3–18 V outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 60 V - supports 12 V, 24 V, and 48 V industrial bus rails without pre-regulation |
| Output Current | 3.5 A continuous - delivers full rated load at TA ≤ 85°C with proper PCB thermal design |
| Quiescent Current | 15 µA in regulation - enables always-on systems with ultra-low standby power loss |
| Min. On/Off Time | tON-MIN = 65 ns, tOFF-MIN = 95 ns - enables 1 V @ 60 V input (1.7% duty cycle) without frequency foldback |
| Switching Frequency | 300 kHz to 2.2 MHz - selectable via RT resistor or external SYNC signal for EMI compliance |
| Thermal Shutdown | 160°C trip, 135°C recovery - protects against sustained overload or poor heatsinking |
| Feedback Reference | VFB = 1.006 V ±1.5% - sets output accuracy; enables precise 3.3 V, 5 V, or custom rail generation |
Pinout & Package
LM76003RNPR is housed in a 30-pin WQFN package (6.00 mm × 4.00 mm) with wettable flanks for automated optical inspection and enhanced thermal performance. The exposed die attach pad (DAP) must be soldered to a large ground copper area with ≥6 thermal vias for optimal junction-to-board thermal resistance (RθJB = 9.1°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–5, 22, 26, SW | Power switching node | Connects to inductor and boot capacitor; carries high di/dt; requires short, low-inductance routing |
| 6, BOOT | High-side gate driver supply | Requires 470-nF ceramic capacitor to SW; critical for HS FET turn-on robustness |
| 8, VCC | Internal bias LDO output | Must decouple with 2.2-µF X7R to AGND; not for external loading |
| 9, BIAS | Optional external bias input | Tie to VOUT (3.3–18 V) or 3.3/5 V rail to reduce IQ and improve light-load efficiency |
| 10, RT | Frequency setting input | Resistor to GND sets fSW; 133 kΩ = 300 kHz, 17.4 kΩ = 2.2 MHz |
| 11, SS/TRK | Soft-start & tracking control | 2-µA current source charges external cap; also accepts external ramp for sequencing |
| 12, FB | Output voltage feedback | Resistor divider sets VOUT; 1.006 V reference enables <±1% output tolerance |
| 16, PGOOD | Open-drain power-good flag | Active-low signal indicates VOUT within ±5% of target; requires pullup resistor |
| 17, SYNC/MODE | Sync input & mode select | Ground = PFM/DCM; logic high = FPWM; external clock = sync mode (300–2200 kHz) |
| 18, EN | Precision enable input | 1.204 V threshold with 150-mV hysteresis; supports adjustable UVLO via resistor divider |
| 13–15, 24–25, AGND/PGND | Analog & power ground | AGND is reference for FB/EN/RT; PGND is LS FET source; separate planes recommended |
| 20–21, PVIN | Main power input | Connects to input capacitors; requires low-ESR/ESL CIN placed adjacent to PVIN and PGND |
| EP/DAP | Thermal pad | Must connect to system ground plane with ≥6 thermal vias for reliable 3.5-A operation |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode; reduces conduction loss by >30% vs. asynchronous buck |
| Adjustable soft-start (6.3 ms default) | Prevents inrush current into bulk capacitance; configurable up to >100 ms with external capacitor |
| Voltage tracking capability | Enables controlled power-up sequencing of multiple rails using SS/TRK as slave input |
| High-efficiency light-load architecture (PFM) | Maintains >85% efficiency at 10 mA load via frequency reduction, minimizing switching loss |
| Cycle-by-cycle current limit | HS current limit of 5.5 A (typ) protects against short-circuit faults without external sensing |
| EMI-optimized pinout & layout | Separated power/ground pins and minimized high-di/dt loop area meet CISPR-22 Class B limits |
Applications
| Telecom Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Provides isolated 3.3 V/5 V rails from 48 V backplane in base station remote radio units. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering 3.5 A to FPGA, transceivers, and memory interfaces. Use Value: Wide 3.5–60 V input range eliminates need for intermediate 12 V conversion; 65-ns tON-MIN supports direct 48 V→3.3 V conversion. | Use Scenario: Powers digital I/O, analog front-end, and microcontroller in programmable logic controller chassis. IC Role / Device Role / Timing Role: Main point-of-load regulator with PGOOD signaling to MCU for fault monitoring and graceful shutdown. Use Value: Precision enable with adjustable UVLO ensures clean startup only when 24 V bus is stable; thermal shutdown prevents field failures. |
| Video Surveillance Camera | Fleet Management Telematics Unit |
Use Scenario: Generates 12 V and 5 V rails from automotive battery (9–16 V) for image sensor, ISP, and Wi-Fi module. IC Role / Device Role / Timing Role: Dual-output configuration (using tracking) for synchronized power-up of sensor and processor domains. Use Value: Adjustable soft-start prevents camera reset during cold cranking; FPWM mode eliminates audible noise in quiet environments. | Use Scenario: Supplies 3.3 V to GPS receiver, cellular modem, and CAN transceiver in vehicle-mounted asset tracker. IC Role / Device Role / Timing Role: High-reliability buck converter with BIAS pin tied to 5 V rail to sustain >92% efficiency at 50 mA sleep current. Use Value: 15-µA quiescent current extends battery life in GPS-sleep mode; wettable flanks ensure solder joint reliability in vibration-prone mounting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM76002RNPR | 2.5-A rated output; identical pinout, features, and package; lower RDS(on) not required for <2.5 A loads | Suitable where peak load ≤2.5 A and board space allows same footprint | Select when cost sensitivity outweighs need for 3.5-A headroom; no PCB change needed |
| TPS54360BDDAR | 3.5-A rating but 3.5–60 V input; no integrated low-side FET; requires external diode or MOSFET; higher BOM count | Better for designs requiring adjustable current limit or discrete power stage control | Choose if external current sense or independent HS/LS drive is required; not pin-compatible |
Compared with LM76002RNPR, LM76003RNPR provides +40% output current headroom in the same WQFN-30 package, while TPS54360BDDAR offers greater flexibility in power stage design at the cost of increased component count and layout complexity.
Availability
LM76003RNPR is available at Aetrix Electronics and suitable for industrial automation, telecommunications infrastructure, and automotive telematics requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM76003RNPR 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management ICs for industrial, automotive, and communications markets.
The LM76003RNPR belongs to TI's high-voltage synchronous buck regulator product line, designed specifically for compact, efficient, and robust DC-DC conversion in harsh environments with wide input voltage ranges.
FAQ
What is the maximum input voltage rating for the LM76003RNPR?
The LM76003RNPR has an absolute maximum input voltage rating of 65 V on the PVIN pin, with recommended continuous operation limited to 60 V. Exceeding 60 V may trigger overvoltage protection or degrade long-term reliability. The device maintains regulation down to 3.5 V, making it suitable for 12 V, 24 V, and 48 V systems with brownout tolerance.
How does the LM76003RNPR achieve high efficiency at light load?
The LM76003RNPR achieves high light-load efficiency through automatic transition to pulse-frequency modulation (PFM) mode, reducing switching frequency as load decreases. This cuts switching losses significantly while maintaining regulation. When configured for forced PWM (FPWM), it sustains constant frequency but trades off some efficiency for ripple and noise predictability.
Can the LM76003RNPR be synchronized to an external clock?
Yes, the LM76003RNPR supports synchronization via its SYNC/MODE pin. When driven with a clean external clock signal between 300 kHz and 2.2 MHz, the device locks its switching frequency and phase to that source, eliminating beat frequencies and easing EMI filtering in multi-rail systems.
What is the purpose of the BIAS pin on the LM76003RNPR?
The BIAS pin on the LM76003RNPR provides an optional external supply path for the internal bias circuitry. When tied to VOUT (3.3–18 V) or a clean 3.3/5 V rail, it reduces quiescent current and improves light-load efficiency. If unused, it must be tied to ground per datasheet requirements.
Does the LM76003RNPR support output voltage tracking during power-up?
Yes, the LM76003RNPR supports voltage tracking via the SS/TRK pin. By connecting this pin to the soft-start node of another regulator, the LM76003RNPR can ramp its output in coordination with a master rail-enabling controlled sequencing for FPGAs, processors, or multi-voltage ASICs without external circuitry.
LM76003RNPR 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 30-WQFN (6x4)
LM76003RNPR FAQ
1.How can I place an order for LM76003RNPR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM76003RNPR 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 LM76003RNPR reliable?
The price and inventory of LM76003RNPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM76003RNPR is usually 5 days.
3.What payment methods are accepted for LM76003RNPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM76003RNPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM76003RNPR?
LM76003RNPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM76003RNPR 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 LM76003RNPR?
For technical support, including LM76003RNPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM76003RNPR requirements.
6.How does Aetrix verify that LM76003RNPR is sourced from the original manufacturer or authorized distributors?
All LM76003RNPR 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 LM76003RNPR meets industry standards.
7.What is the process for return or replacement of LM76003RNPR?
All LM76003RNPR units undergo pre-shipment inspection (PSI). If there is an issue with LM76003RNPR, 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 LM76003RNPR part is unused and in its original packaging.
Return procedure for LM76003RNPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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