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Texas Instruments LM34930TLX/NOPB
- Part No.:
- LM34930TLX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 12-WFBGA
- Datasheet:
-
LM34930TLX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,573
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Product details
Overview
LM34930TLX/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 max switching frequency, and valley current limiting for inductor saturation prevention. It operates in DSBGA-12 package and targets industrial bias rails, distributed power systems, and high-voltage DC/DC conversion.
For engineers reviewing the LM34930TLX/NOPB datasheet, LM34930TLX/NOPB pinout, LM34930TLX/NOPB application, or LM34930TLX/NOPB equivalent, key selection criteria include input voltage range (8V–33V), current limit behavior vs. VIN, BST capacitor requirements (0.022 µF), soft-start programmability via SS pin, and absence of loop compensation.
Technical Context
The LM34930TLX/NOPB uses constant on-time control with inverse VIN dependence to maintain stable switching frequency across line and load variations. Its regulation relies on a 2.52 V internal reference compared at the FB pin, while valley current sensing at ISEN enables cycle-by-cycle current limiting without foldback.
Startup is managed by an internal 7 V VCC bias regulator with UVLO (5.25 V) and thermal shutdown (155 °C). The nOV open-drain indicator activates at 19 V VIN with 1.95 V hysteresis, and over-voltage shutdown disables operation above 36 V VIN with 0.4 V hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8 V to 33 V operating; 44 V absolute max - supports wide industrial input rails without external pre-regulation. |
| Output Current | 1 A continuous load - sufficient for biasing FPGAs, microcontrollers, and analog subsystems. |
| Switching Frequency | Adjustable up to 2 MHz via RT resistor - enables compact magnetics and fast transient response. |
| Feedback Reference | 2.52 V ±2% - sets output via external resistor divider; enables precise 2.5 V to 18 V programmable outputs. |
| RDS(on) | 0.33 Ω typical - low conduction loss improves efficiency at 1 A, especially at higher input voltages. |
| Current Limit Threshold | 0.90–1.35 A (VIN-dependent) - valley-sensing prevents inductor saturation during overload or startup. |
| Soft-Start Control | 10 µA internal current source into SS pin - allows precise ramp time setting with external capacitor. |
Pinout & Package
LM34930TLX/NOPB is housed in a 1.77 mm × 2.1 mm DSBGA-12 package with 12 solder bumps arranged in a 3×4 grid. Thermal performance is optimized for PCB copper area under the exposed die pad (SGND-connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | GND | Primary ground reference for all internal circuitry and power return path. |
| A2 | nOV | Open-drain over-voltage indicator - pulls low when VIN > 19 V; requires external pull-up ≤7 V. |
| A3 | FB | Feedback input tied to internal 2.52 V comparator - sets output voltage via R1/R2 divider. |
| B1 | ISEN | Valley current sense node - monitors recirculating diode current to trigger current limit. |
| B2 | RT | On-time programming pin - resistor from VIN sets switching frequency and on-time duration. |
| B3 | SS | Soft-start timing node - internal 10 µA current charges external capacitor for controlled VOUT ramp. |
| C1, C2 | VIN | Main input supply pins - dual connection reduces trace inductance and improves high-current handling. |
| C3 | VCC | Internally regulated 7 V bias supply - powers gate driver and control logic; current-limited to 15 mA. |
| D1, D2 | SW | Switching node - connects to inductor, freewheeling diode, and bootstrap capacitor; carries full switch current. |
| D3 | BST | Bootstrap capacitor terminal - requires 0.022 µF ceramic cap between BST and SW for high-side gate drive. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Constant on-time architecture eliminates need for external compensation network - simplifies layout and reduces BOM count. |
| Intelligent valley current limit | Threshold decreases with rising VIN and on-time reduces ~50% during current limit - actively prevents inductor saturation under fault conditions. |
| Input over-voltage protection | Dual-level monitoring: nOV indicator at 19 V (with 1.95 V hysteresis) and hard shutdown at 36 V (0.4 V hysteresis) - protects downstream circuitry from transients. |
| Ultra-fast transient response | On-time adjustment per cycle enables sub-microsecond recovery from load steps - maintains tight regulation without output capacitance overdesign. |
| Thermal shutdown with hysteresis | Activates at 155 °C junction temperature and releases at ~135 °C - prevents thermal runaway while avoiding oscillation near trip point. |
Applications
| Industrial Bias Rails | Automotive Infotainment Power |
|---|---|
|
Use Scenario: Generating stable 5 V or 3.3 V bias for microcontrollers, CAN transceivers, and sensor interfaces in factory automation PLCs. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24 V DC bus to low-voltage logic rails; operates continuously with 1 A peak demand. Use Value: Input range (8–33 V) accommodates brownout and surge conditions; valley current limit avoids inductor saturation during motor startup surges. |
Use Scenario: Supplying 5 V to display controllers and audio codecs in head units where battery voltage varies from 9 V (cranking) to 16 V (charging). IC Role / Device Role / Timing Role: High-efficiency buck converter with fast transient response to handle burst-mode DSP loads and EMI-sensitive RF sections. Use Value: 2 MHz switching enables small 10 µH inductor and low-profile ceramic caps; nOV pin provides early warning before 36 V shutdown threshold. |
| Distributed Telecom Power | Test & Measurement Equipment |
|
Use Scenario: Local 12 V-to-5 V conversion on modular instrument cards requiring clean, isolated bias with minimal board space. IC Role / Device Role / Timing Role: Compact DSBGA-12 regulator delivering regulated 5 V at up to 1 A with minimal external components. Use Value: No compensation needed reduces design iteration time; BST/SW pin pairing ensures robust gate drive even with layout parasitics. |
Use Scenario: Powering precision ADC front-ends and FPGA configuration circuits where output ripple and noise must be minimized. IC Role / Device Role / Timing Role: Low-noise buck regulator with 2.52 V reference accuracy (±2%) and FB pin ripple injection via C6 for stable regulation. Use Value: Adjustable soft-start (via SS pin) prevents inrush into sensitive analog stages; VCC UVLO ensures clean startup 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 4.5–65 V input, 1.5 A rating, integrated high-side FET, but requires external compensation and lacks nOV indicator. | Automotive AEC-Q100 qualified; suited for 12 V/24 V systems with higher VIN margin and longer lifetime requirements. | Select LM5164QDDARQ1 when AEC-Q100 compliance, extended input range, or higher current is mandatory - not drop-in compatible due to different pinout and compensation needs. |
| TPS54202DDCR | Lower 4.5–28 V input, 2 A rating, fixed 500 kHz–2.2 MHz frequency, integrated compensation, no BST pin or valley current limit. | Cost-optimized consumer/industrial designs needing simpler layout and lower BOM cost, but less robust under high-VIN fault conditions. | Select TPS54202DDCR for 12 V input systems prioritizing ease of use and integration - not suitable for 30+ V inputs or applications requiring inductor saturation protection. |
Compared with LM5164QDDARQ1 and TPS54202DDCR, the LM34930TLX/NOPB uniquely balances high input voltage tolerance (33 V), valley current limiting for fault resilience, and ultra-compact DSBGA packaging - making it optimal for space-constrained industrial bias rails where 8–33 V operation and reliability under overload are critical.
Availability
LM34930TLX/NOPB is available at Aetrix Electronics and suitable for industrial bias rails, automotive infotainment power supplies, distributed telecom power modules, and test equipment requiring stable component supply with long-term manufacturability.
Supply support for LM34930TLX/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 LM34930TLX/NOPB belongs to TI's high-voltage constant-on-time buck regulator product line, designed specifically for efficient, compact, and robust DC/DC conversion in industrial and automotive environments where wide input range and fault resilience are essential.
FAQ
What is the maximum input voltage the LM34930TLX/NOPB can withstand without damage?
The LM34930TLX/NOPB has an absolute maximum VIN rating of 44 V, meaning it can survive brief transients up to that level. However, its over-voltage shutdown activates at 36 V (with 0.4 V hysteresis), and normal operation is specified from 8 V to 33 V. Sustained operation above 33 V will trigger shutdown, protecting downstream circuitry. Always verify transient immunity with system-level testing.
How does the LM34930TLX/NOPB prevent inductor saturation during overload?
The LM34930TLX/NOPB prevents inductor saturation using valley current limiting: it senses recirculating current at the ISEN pin during the off-time and dynamically reduces the on-time by ~50% when current limit is detected. This cycle-by-cycle action lowers peak inductor current, especially at high VIN and heavy load - a feature confirmed in the datasheet's "Current Limit" section and Figure 18 waveform analysis.
Can the LM34930TLX/NOPB operate without an external bootstrap capacitor?
No - the LM34930TLX/NOPB requires a 0.022 µF ceramic capacitor between BST and SW pins for proper high-side gate drive. This capacitor is charged during the off-time via an internal diode from VCC. Omitting it causes gate drive failure, leading to erratic switching or complete non-operation. TI's datasheet explicitly mandates this component in both the PIN DESCRIPTIONS and APPLICATIONS INFORMATION sections.
What is the purpose of the nOV pin on the LM34930TLX/NOPB, and how should it be used?
The nOV pin on the LM34930TLX/NOPB is an open-drain over-voltage indicator that pulls low when VIN exceeds 19 V (with 1.95 V hysteresis). It is not a shutdown signal - the device continues operating until VIN reaches 36 V. To use it, connect a pull-up resistor (to ≤7 V) to monitor early over-voltage events for system-level diagnostics or pre-shutdown warnings, as detailed in the "Over-Voltage Indicator" functional description.
Does the LM34930TLX/NOPB require external compensation components?
No - the LM34930TLX/NOPB uses constant on-time control architecture, which eliminates the need for external compensation networks such as type-II or type-III compensators. This is explicitly stated in the FEATURES list ("No Loop Compensation Required") and reinforced in the FUNCTIONAL DESCRIPTION, where it notes that the control principle "requires no loop compensation resulting in very fast load transient response."
LM34930TLX/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
LM34930TLX/NOPB FAQ
1.How can I place an order for LM34930TLX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM34930TLX/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 LM34930TLX/NOPB reliable?
The price and inventory of LM34930TLX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM34930TLX/NOPB is usually 5 days.
3.What payment methods are accepted for LM34930TLX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM34930TLX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM34930TLX/NOPB?
LM34930TLX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM34930TLX/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 LM34930TLX/NOPB?
For technical support, including LM34930TLX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM34930TLX/NOPB requirements.
6.How does Aetrix verify that LM34930TLX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM34930TLX/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 LM34930TLX/NOPB meets industry standards.
7.What is the process for return or replacement of LM34930TLX/NOPB?
All LM34930TLX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM34930TLX/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 LM34930TLX/NOPB part is unused and in its original packaging.
Return procedure for LM34930TLX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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