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Texas Instruments LM34930TL/NOPB
- Part No.:
- LM34930TL/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 12-WFBGA
- Datasheet:
-
LM34930TL/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,878
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Product details
Overview
LM34930TL/NOPB from Texas Instruments is a constant on-time, 33V-input, 1A synchronous buck switching regulator with integrated N-channel MOSFET, adjustable 2.5V–18V output, 2 MHz switching frequency capability, and intelligent valley current limiting to prevent inductor saturation under fault conditions - used in industrial power supplies and automotive auxiliary rails.
For engineers reviewing the LM34930TL/NOPB datasheet, LM34930TL/NOPB pinout, LM34930TL/NOPB application, or LM34930TL/NOPB equivalent, key selection considerations include input over-voltage shutdown at 36V, 2.52V ±2% feedback reference, DSBGA-12 package thermal performance (θJA = 65°C/W), and no-loop-compensation design for fast transient response in space-constrained DC/DC converters.
Technical Context
The LM34930TL/NOPB employs constant on-time control with VIN-dependent tON (127–430 ns) and fixed minimum tOFF (90 ns), enabling near-constant switching frequency across 8V–33V input and full load range. Its valley current limit detection operates cycle-by-cycle, reducing tON by ~50% when triggered to suppress peak inductor current.
Internal 7V VCC bias regulator (6.6–7.4V, 15 mA current limit) powers gate drive and logic; bootstrap capacitor (0.022 µF between BST and SW) sustains high-side N-MOSFET drive. Over-voltage indicator (nOV) asserts low at 19V with 1.95V hysteresis, while shutdown activates at 36V with 0.4V hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8V to 33V operating; 44V absolute max - supports wide-range industrial and automotive inputs without external pre-regulation. |
| Output Current | 1A continuous load - sufficient for FPGA I/O banks, microcontroller cores, and sensor signal chains. |
| Feedback Reference | 2.52V ±2% - enables precise output regulation from 2.5V using standard resistor dividers (e.g., 5V via R1=2.32kΩ/R2=2.37kΩ). |
| Switching Frequency | Adjustable up to 2 MHz via RT resistor - allows compact magnetics and reduced output ripple in space-limited designs. |
| Current Limit Threshold | 0.90–1.35A (VIN-dependent) - dynamically scales down at high input voltage to avoid inductor saturation during overload. |
| Thermal Shutdown | 155°C activation with 20°C hysteresis - protects device during sustained overload or poor PCB heatsinking. |
| VCC Regulator | 7.0V ±0.4V, 15 mA current limit - self-biases internal circuitry and gate driver without external LDO. |
Pinout & Package
LM34930TL/NOPB is housed in a 1.77 mm × 2.1 mm, 12-bump DSBGA package with 0.4 mm pitch and bottom-side thermal pad. The package supports high-density layout and efficient thermal conduction to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | GND | Primary ground reference for all internal circuits and power return path for ISEN current sensing. |
| A2 | nOV | Open-drain over-voltage indicator - pulls low when VIN > 19V; requires external pull-up ≤7V for system monitoring. |
| A3 | FB | Feedback input tied to internal 2.52V comparator - sets output voltage via external resistor divider (VOUT = 2.52 × (R1+R2)/R2). |
| B1 | ISEN | Valley current sense terminal - monitors recirculating diode current to detect current limit and reduce tON by ~50%. |
| B2 | RT | On-time programming pin - external resistor from VIN sets tON and thus switching frequency (FS ≈ VOUT / [VIN × (RT + 0.5k) × 4.15e−11]). |
| B3 | SS | Soft-start control - internal 10 µA current source charges external capacitor to ramp output voltage and limit inrush. |
| C1, C2 | VIN | Main input supply pins - dual connection reduces trace inductance and improves high-frequency noise immunity. |
| C3 | VCC | Internal bias regulator output - supplies 7V to gate driver and logic; requires ≥0.1 µF ceramic capacitor for stability. |
| D1, D2 | SW | Switching node - connects to inductor, freewheeling diode, and bootstrap capacitor; carries high dI/dt pulses. |
| D3 | BST | Bootstrap capacitor connection - 0.022 µF capacitor between BST and SW provides gate drive voltage for N-MOSFET. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Constant on-time architecture eliminates external compensation network - reduces BOM count and layout sensitivity to parasitics. |
| Ultra-fast transient response | Load step recovery within microseconds due to immediate tON adjustment - maintains tight regulation during CPU burst loads. |
| Intelligent current limiting | Valley-sense + VIN-scaled threshold + tON reduction prevents inductor saturation and enables graceful foldback-free current limiting. |
| Input over-voltage protection | Dual-level response: nOV flag at 19V (for system alert), hard shutdown at 36V - safeguards downstream circuitry from transients. |
| Adjustable soft-start | Externally programmable via SS capacitor (e.g., 0.02 µF = 5 ms ramp) - prevents input rail collapse and inrush into bulk capacitors. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Converting 24V battery or 12–36V industrial bus to stable 5V/3.3V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator delivering 1A at 5V with 2.52V precision feedback and 36V OVP for robustness against load dump. Use Value: Eliminates need for external current-sense resistor and compensation components, reducing solution size by >30% vs. voltage-mode controllers. |
Use Scenario: Powering microcontrollers, CAN transceivers, and LED drivers in vehicle door modules and seat control units. IC Role / Device Role / Timing Role: High-voltage buck converter with 19V nOV alert and 36V shutdown - meets ISO 7637-2 pulse 5a/b requirements for automotive transients. Use Value: Integrated 7V VCC regulator and bootstrap driver enable single-supply operation from raw battery, avoiding discrete bias rails. |
| Point-of-Load Converter | Field-Programmable Gate Array (FPGA) Auxiliary Rail |
|
Use Scenario: Local 3.3V or 2.5V regulation near ASICs or DSPs on dense digital boards where layout area is constrained. IC Role / Device Role / Timing Role: Compact DSBGA-12 buck regulator with 2 MHz capability - supports small 10 µH inductors and low-ESR ceramic output caps. Use Value: Near-constant frequency across line/load simplifies EMI filtering; no loop tuning needed accelerates design validation. |
Use Scenario: Generating 1.2V or 1.8V core supply for FPGA configuration and I/O banks requiring fast load-step response. IC Role / Device Role / Timing Role: Constant on-time controller with ultra-fast transient recovery - holds output within ±3% during 100 mA–1 A load steps. Use Value: Valley current limit avoids false triggering during FPGA startup inrush, ensuring reliable power-up sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QDDARQ1 | Wider 4.5–100V input, 0.6A output, integrated high-side FET only (requires external sync rectifier); uses current-mode control with compensation. | Targets higher-input automotive systems (e.g., 48V mild-hybrid); lacks integrated low-side switch and valley current limit. | Choose LM5164QDDARQ1 when input exceeds 33V or AEC-Q100 qualification is mandatory; LM34930TL/NOPB preferred for cost-sensitive 24V/32V industrial apps with simpler layout. |
| TPS54202DDCR | Lower 4.5–28V input, 2A output, voltage-mode control with internal compensation; 1.5 MHz fixed frequency; SOIC-8 package. | Suited for lower-voltage consumer/industrial supplies; larger footprint and less transient resilience than constant-on-time architecture. | Choose TPS54202DDCR for designs needing 2A output below 28V with proven voltage-mode stability; LM34930TL/NOPB offers superior transient response and smaller DSBGA footprint above 28V. |
Compared with LM5164QDDARQ1 and TPS54202DDCR, the LM34930TL/NOPB uniquely combines 33V input rating, integrated N-MOSFET, valley current limiting, and DSBGA-12 packaging - delivering the smallest solution size and fastest transient response for 1A industrial buck applications in the 8–33V range.
Availability
LM34930TL/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, point-of-load converters, and FPGA auxiliary rails requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM34930TL/NOPB 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 decades of expertise in high-reliability power conversion solutions.
The LM34930TL/NOPB belongs to TI's high-voltage buck regulator product line, designed specifically for space-constrained industrial and automotive applications demanding robust over-voltage protection, fast transient response, and minimal external components.
FAQ
What is the maximum input voltage the LM34930TL/NOPB can withstand without damage?
The LM34930TL/NOPB has an absolute maximum VIN-to-GND rating of 44V per its datasheet. It operates continuously from 8V to 33V, with internal over-voltage shutdown activating at 36V (±2.3V hysteresis) to protect downstream circuitry. Transient spikes up to 44V are tolerated briefly but must not exceed duration limits specified in TI's reliability reports. Always verify layout grounding and input capacitance to ensure safe clamping during load dump events.
Does the LM34930TL/NOPB require external compensation components?
No, the LM34930TL/NOPB uses constant on-time control architecture and does not require external compensation components such as type-II or type-III networks. Its regulation loop is inherently stable across line and load variations, eliminating phase-margin analysis and simplifying PCB layout. This feature directly reduces bill-of-materials cost and design cycle time for the LM34930TL/NOPB compared to traditional voltage-mode buck controllers.
How does the LM34930TL/NOPB prevent inductor saturation during overload?
The LM34930TL/NOPB prevents inductor saturation using a three-tiered approach: (1) valley current sensing at the ISEN pin detects recirculating current; (2) current limit threshold decreases as VIN increases (e.g., 1.15A at 12V → 1.10A at 30V); and (3) upon limit detection, the on-time is reduced by ~50% cycle-by-cycle. This coordinated action limits peak inductor current without foldback, maintaining predictable behavior in the LM34930TL/NOPB during sustained overload.
What is the function of the nOV pin on the LM34930TL/NOPB?
The nOV pin on the LM34930TL/NOPB is an open-drain output that switches low when VIN exceeds 19V (typical), with 1.95V hysteresis to reject noise. It serves as an early warning indicator - not a shutdown signal - allowing host systems to log faults or initiate graceful shutdown before the 36V over-voltage shutdown triggers. A pull-up resistor to ≤7V is mandatory; the LM34930TL/NOPB datasheet specifies maximum sink current of 1 mA at 200 mV low-level voltage.
Can the LM34930TL/NOPB be used in automotive applications?
Yes, the LM34930TL/NOPB is qualified for automotive environments per its -40°C to +125°C junction temperature rating and built-in protections: 36V input over-voltage shutdown, thermal shutdown at 155°C, and 19V nOV alert. While not AEC-Q200 certified out-of-box, it has been widely deployed in non-safety-critical automotive body electronics (e.g., mirror controls, seat modules). For ASIL-B/C systems, pairing the LM34930TL/NOPB with external watchdog supervision is recommended per functional safety guidelines.
LM34930TL/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-WFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 8V
- Voltage - Input (Max):
- 33V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 30V
- Current - Output:
- 1A
- Frequency - Switching:
- Adj to 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DSBGA
LM34930TL/NOPB FAQ
1.How can I place an order for LM34930TL/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM34930TL/NOPB 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 LM34930TL/NOPB reliable?
The price and inventory of LM34930TL/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM34930TL/NOPB is usually 5 days.
3.What payment methods are accepted for LM34930TL/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM34930TL/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM34930TL/NOPB?
LM34930TL/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM34930TL/NOPB 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 LM34930TL/NOPB?
For technical support, including LM34930TL/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM34930TL/NOPB requirements.
6.How does Aetrix verify that LM34930TL/NOPB is sourced from the original manufacturer or authorized distributors?
All LM34930TL/NOPB 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 LM34930TL/NOPB meets industry standards.
7.What is the process for return or replacement of LM34930TL/NOPB?
All LM34930TL/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM34930TL/NOPB, 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 LM34930TL/NOPB part is unused and in its original packaging.
Return procedure for LM34930TL/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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