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Texas Instruments LM76003RNPT
- Part No.:
- LM76003RNPT
- Manufacturer:
- Texas Instruments
- Package:
- 30-WFQFN Exposed Pad
- Datasheet:
-
LM76003RNPT.pdf
- Description:
- IC REG BUCK ADJ 3.5A 30WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,025
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Product details
Overview
LM76003RNPT from Texas Instruments is a 3.5-V to 60-V input, 3.5-A synchronous step-down DC-DC regulator in a 30-pin WQFN package with wettable flanks. It delivers regulated output from 1 V to 95% VIN, features peak-current-mode control, 15-µA quiescent current in regulation, and supports PFM/FPWM operation for high efficiency across load range - deployed in industrial power rails and telecom infrastructure.
For engineers reviewing the LM76003RNPT datasheet, LM76003RNPT pinout, LM76003RNPT application, or LM76003RNPT equivalent, key selection considerations include its 65-ns minimum on-time, adjustable 300 kHz–2.2 MHz switching frequency, precision enable threshold (1.14–1.25 V), power-good flag, and thermal shutdown at 160°C - all validated for wide-input industrial and embedded power conversion.
Technical Context
The LM76003RNPT employs fixed-frequency peak-current-mode control with internal compensation, enabling stable regulation with minimal external components. It supports three light-load modes: auto PFM (efficiency-optimized), FPWM (constant frequency), and DCM - selected via SYNC/MODE pin logic level or external clock synchronization.
Its architecture integrates high-side and low-side NMOS FETs (RDS(on) = 95 mΩ / 45 mΩ typ at 1 A), boot-strapped gate drive (BOOT–SW UVLO = 1.6–2.7 V), and dual ground paths (AGND for analog reference, PGND for power return). The device implements automated frequency foldback below tON-MIN or tOFF-MIN to sustain regulation under extreme VIN/VOUT ratios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 60 V - supports 24-V and 48-V industrial bus rails with 65-V absolute max rating. |
| Output Current | 3.5 A continuous - enables single-regulator solutions for FPGA core, DSP, or PoE-powered subsystems. |
| Quiescent Current | 15 µA in regulation - sustains battery-backed or always-on systems without significant standby drain. |
| Switching Frequency | 300 kHz to 2.2 MHz - adjustable via RT resistor or external SYNC clock for EMI optimization or size reduction. |
| Min On/Off Time | tON-MIN = 65 ns, tOFF-MIN = 95 ns - enables high VIN-to-low VOUT conversion (e.g., 48 V → 3.3 V) without duty-cycle limitation. |
| Feedback Reference | VFB = 1.006 V ±1.5% - sets output accuracy; used with RFBT/RFBB divider for precise voltage programming. |
| Thermal Shutdown | 160°C trip, 135°C recovery - protects against sustained overload or poor heatsinking in enclosed enclosures. |
| Power-Good Flag | Open-drain PGOOD with 86–93% UV and 106–113% OV thresholds - provides reliable system sequencing and fault detection. |
Pinout & Package
LM76003RNPT is housed in a 30-pin WQFN (RNP) package, 6.00 mm × 4.00 mm, with wettable flanks for automated optical inspection and enhanced thermal performance. Exposed thermal pad (DAP) connects internally to AGND and must be soldered to PCB ground plane with ≥9 thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–5, 22, 26 | SW | Switch node - connects to inductor and boot capacitor; carries high di/dt; requires tight layout to minimize EMI. |
| 6 | BOOT | High-side gate driver supply - requires 470-nF ceramic cap to SW; critical for HS FET turn-on robustness. |
| 7,19,23,27–30 | NC | No-connect - tie to ground pour to improve thermal conduction and mechanical reliability. |
| 8 | VCC | Internal bias LDO output - decouple with 2.2-µF ceramic to AGND; not for external loading. |
| 9 | BIAS | Optional efficiency boost input - connect to VOUT (3.3–18 V) or external 3.3/5 V rail; improves light-load efficiency. |
| 10 | RT | Frequency set - resistor to AGND configures fSW; open = 500 kHz default; 17.4 kΩ = 2.2 MHz max. |
| 11 | SS/TRK | Soft-start/tracking - 2-µA current source charges external cap for programmable ramp; also accepts external tracking voltage. |
| 12 | FB | Feedback input - senses output via resistive divider; 1.006 V reference enables accurate VOUT programming. |
| 16 | PGOOD | Open-drain power-good - active-high when VOUT within ±10% of target; requires pull-up for system monitoring. |
| 17 | SYNC/MODE | Multi-function pin - ground = PFM/DCM; logic high = FPWM; external clock = sync mode with forced PWM. |
| 18 | EN | Precision enable - 1.14–1.25 V rising threshold enables adjustable UVLO using resistor divider from PVIN. |
| 13–15 | AGND | Analog ground - reference for FB, EN, PGOOD; separate from PGND to avoid noise coupling into feedback path. |
| 20–21,24–25 | PVIN | Main power input - connect directly to CIN with shortest possible trace; supplies HS FET and internal LDO. |
| 24–26 | PGND | Power ground - return path for LS FET and CIN/COUT; must be low-inductance connection to DAP and AGND. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode - reduces conduction loss and board area; RDS(on) HS/LS = 95/45 mΩ typ. |
| Adjustable soft-start (6.3 ms default) | Prevents inrush current during startup - configurable via SS/TRK capacitor; supports voltage tracking in multi-rail systems. |
| Synchronization capability | Accepts external 300 kHz–2.2 MHz clock on SYNC/MODE - enables coherent switching in multi-converter systems to reduce beat frequencies. |
| High-efficiency light-load architecture | Auto PFM mode drops fSW under light load - achieves >85% efficiency at 10 mA while maintaining 15-µA IQ. |
| Comprehensive protection suite | Cycle-by-cycle current limit, hiccup-mode short-circuit response, thermal shutdown, and VCC UVLO - ensures robust field operation. |
| EMI-optimized pinout and layout | Separated AGND/PGND, dedicated PVIN/PGND pairs, and wettable flanks - meets CISPR-22 Class B with minimal filtering. |
Applications
| Industrial PLC Power Supply | Telecom Remote Radio Unit |
|---|---|
|
Use Scenario: Provides isolated 5-V and 3.3-V rails from 48-V backplane in modular PLC I/O modules. IC Role / Device Role / Timing Role: Primary buck regulator delivering 3.5-A 5-V output; synchronized to system clock via SYNC/MODE pin. Use Value: Wide 3.5–60-V input range accommodates brownout and surge conditions; PFM mode extends battery backup runtime. |
Use Scenario: Powers FPGA, transceiver ICs, and memory in outdoor 4G/5G RRUs exposed to temperature extremes. IC Role / Device Role / Timing Role: Main point-of-load converter with thermal shutdown at 160°C and -40°C to +125°C operating range. Use Value: Wettable-flank WQFN package ensures solder joint reliability; 65-ns tON-MIN supports 48-V → 1.2-V core rail conversion. |
| Video Surveillance System | Asset Tracking Telematics |
|
Use Scenario: Powers image sensor, ISP, and wireless module in IP cameras powered by PoE+ (57 V max). IC Role / Device Role / Timing Role: Single-chip 12-V intermediate rail generator; uses BIAS pin tied to VOUT for >92% efficiency at 1 A. Use Value: 15-µA quiescent current enables low-power motion-detection standby; PGOOD enables clean system wake-up. |
Use Scenario: Regulates battery-supplied 3.3-V rail in GPS-enabled fleet trackers with intermittent cellular transmission. IC Role / Device Role / Timing Role: High-input buck converter accepting 6–36-V vehicle battery; precision EN pin enables ignition-synchronized startup. Use Value: Adjustable soft-start prevents voltage droop during cold cranking; RT-resistor tuning optimizes size vs. efficiency trade-off. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM76002RNPT | 2.5-A output current, identical pinout and feature set; lower current rating and slightly higher RDS(on). | Suitable where load current ≤2.5 A; same PCB layout but derated thermal margin. | Select LM76002RNPT only if 3.5-A headroom is unnecessary - reduces cost without redesign. |
| TPS54360BDDAR | 3.5-A, 3.5–60-V input, but uses current-mode control without PFM; 110-µA IQ in sleep mode; no SYNC or tracking. | Lacks voltage tracking and external sync; less suited for multi-rail sequencing or noise-sensitive RF systems. | Choose TPS54360BDDAR when strict constant-frequency operation is required and soft-start/tracking are not needed. |
Compared with LM76002RNPT and TPS54360BDDAR, the LM76003RNPT uniquely combines 3.5-A capability, PFM/FPWM flexibility, voltage tracking, and 15-µA quiescent current - making it optimal for thermally constrained, multi-rail, or battery-sensitive industrial designs.
Availability
LM76003RNPT is available at Aetrix Electronics and suitable for industrial PLCs, telecom remote radio units, video surveillance systems, and asset tracking telematics requiring stable component supply across extended temperature and input voltage ranges.
Supply support for LM76003RNPT 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 and embedded processing technologies, with decades of expertise in power management IC design and manufacturing.
The LM76003RNPT belongs to TI's high-voltage synchronous buck regulator product line, engineered for rugged industrial, telecom, and automotive power conversion where wide input range, high efficiency, and thermal resilience are critical.
FAQ
What is the maximum input voltage rating for the LM76003RNPT?
The LM76003RNPT has an absolute maximum input voltage of 65 V applied to the PVIN pin, with recommended operating range from 3.5 V to 60 V. Operation beyond 60 V risks exceeding safe junction temperature or violating SOA limits, even if within absolute max ratings. Always verify transient conditions and use appropriate input clamping if surges exceed 60 V.
How does the LM76003RNPT achieve high efficiency at light load?
The LM76003RNPT 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. Its 15-µA quiescent current and optional BIAS pin connection further minimize idle power - enabling >85% efficiency at 10 mA output.
Can the LM76003RNPT be synchronized to an external clock?
Yes, the LM76003RNPT supports external clock synchronization via the SYNC/MODE pin. When driven with a clean 300 kHz–2.2 MHz square wave, the device locks its switching frequency and phase to the external source while maintaining forced-PWM operation. This eliminates beat frequencies in multi-converter systems and simplifies EMI filter design.
What is the purpose of the BIAS pin on the LM76003RNPT?
The BIAS pin on the LM76003RNPT provides an optional auxiliary supply path for the internal control circuitry. When tied to VOUT (for 3.3–18 V outputs) or an external 3.3/5-V rail, it reduces power dissipation in the internal LDO and improves light-load efficiency by up to 5%. If unused, the BIAS pin must be grounded.
Does the LM76003RNPT support output voltage tracking?
Yes, the LM76003RNPT supports output voltage tracking via the SS/TRK pin. By applying an external ramp voltage to this pin, the output follows a master supply during startup or shutdown - essential for FPGA, ASIC, or multi-core processor sequencing. Internal soft-start defaults to 6.3 ms when SS/TRK is left floating.
LM76003RNPT 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)
LM76003RNPT FAQ
1.How can I place an order for LM76003RNPT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM76003RNPT 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 LM76003RNPT reliable?
The price and inventory of LM76003RNPT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM76003RNPT is usually 5 days.
3.What payment methods are accepted for LM76003RNPT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM76003RNPT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM76003RNPT?
LM76003RNPT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM76003RNPT 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 LM76003RNPT?
For technical support, including LM76003RNPT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM76003RNPT requirements.
6.How does Aetrix verify that LM76003RNPT is sourced from the original manufacturer or authorized distributors?
All LM76003RNPT 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 LM76003RNPT meets industry standards.
7.What is the process for return or replacement of LM76003RNPT?
All LM76003RNPT units undergo pre-shipment inspection (PSI). If there is an issue with LM76003RNPT, 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 LM76003RNPT part is unused and in its original packaging.
Return procedure for LM76003RNPT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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