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Texas Instruments LM34910SD/NOPB
- Part No.:
- LM34910SD/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WDFN Exposed Pad
- Datasheet:
-
LM34910SD/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.25A 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,855
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Product details
Overview
LM34910SD/NOPB from Texas Instruments is a high-voltage, 40V N-channel buck switching regulator IC with integrated switch, delivering up to 1.25A output current. It operates from 8V to 36V input, features hysteretic control (no loop compensation required), 2.5V internal reference, and valley current limiting at 1.25A - designed for point-of-load regulation in telecom and industrial power systems.
For engineers reviewing the LM34910SD/NOPB datasheet, LM34910SD/NOPB pinout, LM34910SD/NOPB application, or LM34910SD/NOPB equivalent, key selection criteria include its fixed 2.5V FB threshold, RON-based on-time programming, BST/SGND/ISEN terminal configuration for current sensing, and WSON-10 thermal pad layout requirements.
Technical Context
The LM34910SD/NOPB implements a hysteretic on-time control architecture where switching frequency remains stable across line and load variations due to inverse VIN–tON relationship. Its regulation relies on direct comparison of FB voltage against a precision 2.5V internal reference, with overvoltage protection triggered at 2.875V.
Current limiting is performed during off-time via valley detection at ISEN–SGND, with fixed 1.25A threshold and 130mΩ internal sense resistance. Startup uses an integrated 7V series regulator (VCC) with 5.8V UVLO, while softstart is implemented via 11.5µA current source charging SS to 2.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8V to 36V - supports wide-range industrial and telecom inputs; absolute max 40V transient tolerance. |
| Output Current | 1.25A continuous - set by valley current limit; peak switch current limited to 3.5A. |
| Feedback Reference | 2.5V ±2% - defines regulated output via external resistor divider; enables precise VOUT = 2.5 × (R1 + R2)/R2. |
| On-Time Control | Programmable via RON resistor - tON inversely scales with VIN (e.g., 2.75µs typ at VIN=24V, RON=200kΩ). |
| Switch RDS(on) | 0.45Ω typ - integrated 40V N-channel MOSFET reduces external component count and conduction loss. |
| Thermal Shutdown | 175°C activation with 20°C hysteresis - protects device under overload or poor heatsinking conditions. |
| Softstart Current | 11.5µA - charges external SS capacitor linearly to 2.5V, enabling controlled output ramp-up without inrush. |
Pinout & Package
LM34910SD/NOPB is housed in a thermally enhanced 4 mm × 4 mm WSON-10 package with exposed thermal pad (DPR suffix), optimized for high-power density and PCB heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switching node | Connects to inductor, freewheeling diode, and BST capacitor; carries full switching current and high dv/dt. |
| BST (Pin 2) | Bootstrap supply | Drives high-side gate via 0.022µF capacitor to SW; internal diode recharges it each off-cycle. |
| ISEN (Pin 3) | Current sense input | Senses recirculating current from SGND; triggers valley current limit at 1.25A (130mΩ internal sense). |
| SGND (Pin 4) | Sense ground | Return path for current-sense resistor; must be separated from RTN to avoid noise coupling into regulation loop. |
| RTN (Pin 5) | Circuit ground | Reference for internal comparators and logic; connects to system ground but kept separate from power return paths. |
| FB (Pin 6) | Feedback input | Compares output-derived voltage to 2.5V reference; requires ≥25mV ripple for stable hysteretic operation. |
| SS (Pin 7) | Softstart control | Internally charged to 2.5V via 11.5µA source; ramps FB reference to prevent output overshoot at startup. |
| RON/SD (Pin 8) | On-time programming & shutdown | Resistor sets tON; grounding disables regulator and resets SS pin. |
| VCC (Pin 9) | Startup regulator output | 7.0V ±0.4V regulated supply for internal circuitry; can be externally biased (8–14V) to reduce dissipation. |
| VIN (Pin 10) | Main input supply | Accepts 8–36V DC; powers both switch and internal regulators; withstands 40V transients. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Hysteretic control eliminates external compensation components, simplifying design and improving transient response. |
| Ultra-fast transient response | On-time control and comparator-based regulation enable sub-microsecond load step recovery without phase-margin tuning. |
| Adjustable output voltage | Set precisely via two-resistor divider on FB pin; supports outputs from ~2.5V upward using standard 1–10kΩ resistors. |
| Thermally enhanced WSON-10 | Exposed pad improves θJA by >30% vs. standard MSOP; enables 1.25A operation in compact 4×4mm footprint. |
| Integrated start-up regulator | VCC pin delivers regulated 7V/9mA supply directly from VIN, eliminating need for external bias rail in most applications. |
Applications
| Telecom Point-of-Load Regulator | Industrial Secondary Post-Regulator |
|---|---|
Use Scenario: Converting 24V or 48V intermediate bus to 3.3V/5V for FPGA, DSP, or interface ICs in base station equipment. IC Role / Device Role / Timing Role: Primary buck controller providing regulated POL output with fast transient immunity to burst-mode traffic loads. Use Value: Eliminates external compensation and reduces BOM count; 1.25A capability supports multi-rail digital loads without parallel devices. | Use Scenario: Stepping down 36V industrial bus to 12V for PLC I/O modules or sensor signal conditioning circuits. IC Role / Device Role / Timing Role: High-input-voltage buck regulator handling wide-line variations and EMI-prone factory environments. Use Value: 8–36V input range and 40V transient rating ensure robustness; thermal pad enables reliable operation at full load in confined enclosures. |
| Automotive Body Control Module Supply | Test Equipment Auxiliary Rail |
Use Scenario: Generating 5V from 12V/24V vehicle battery (with load dump protection) for microcontroller and CAN transceiver rails. IC Role / Device Role / Timing Role: Input-tolerant buck regulator managing cold-crank (6V) to load-dump (40V) conditions while maintaining regulation. Use Value: Wide VIN range and built-in UVLO/thermal shutdown meet automotive reliability requirements without added supervision ICs. | Use Scenario: Providing stable 3.3V/5V auxiliary supply in benchtop test instruments where low-noise, fast-recovery performance is critical. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator powering analog front-ends and ADC references with minimal layout sensitivity. Use Value: Hysteretic control ensures consistent frequency and rapid recovery from step loads - essential for measurement accuracy and repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QDDARQ1 | 42V input, 0.6A output, constant-on-time control; requires external compensation for some configurations. | Designed for automotive AEC-Q100 Grade 1; includes spread-spectrum and enhanced fault reporting. | Choose for automotive-qualified designs needing higher VIN margin and diagnostic features - not drop-in compatible due to different pinout and control scheme. |
| TPS54202HDDCR | 28V input, 2A output, current-mode control with integrated compensation; smaller 8-pin SOIC package. | Optimized for cost-sensitive industrial supplies; lacks BST pin and requires external bootstrap diode. | Choose when higher output current and simpler layout are priorities - requires redesign of feedback and timing networks. |
Compared with LM34910SD/NOPB, LM5164QDDARQ1 offers automotive qualification and higher input rating but lower current capability and different control architecture, while TPS54202HDDCR provides greater output current and integrated compensation at the expense of reduced input voltage range and no BST-driven high-side drive.
Availability
LM34910SD/NOPB is available at Aetrix Electronics and suitable for telecom point-of-load regulation, industrial secondary post-regulation, and automotive body control module power supplies requiring stable component supply and long-term manufacturability.
Supply support for LM34910SD/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 technologies, with decades of expertise in high-reliability power conversion ICs.
The LM34910SD/NOPB belongs to TI's high-voltage buck regulator product line, engineered for efficient, compact DC-DC conversion in space-constrained industrial and communications infrastructure applications.
FAQ
What is the minimum input voltage required for stable operation of the LM34910SD/NOPB?
The LM34910SD/NOPB requires a minimum input voltage of 8.0V for normal operation, as specified in its Operating Ratings. Below this, the internal VCC start-up regulator cannot maintain its 7.0V output above the 5.8V UVLO threshold, causing the device to disable. At light loads or with external VCC bias, the effective minimum may increase slightly due to VCC output impedance (140Ω), but 8.0V remains the guaranteed functional lower limit per datasheet.
How does the RON resistor affect switching frequency in the LM34910SD/NOPB?
The RON resistor directly sets the on-time duration (tON) of the LM34910SD/NOPB, which - combined with a fixed 280ns minimum off-time - determines operating frequency. Since tON scales inversely with VIN (e.g., tON ≈ 1.3×10⁻¹⁰ × RON / VIN), selecting RON establishes the nominal frequency at mid-input voltage. For example, RON = 200kΩ yields ~730kHz at VIN = 36V and ~194kHz at VIN = 10V, demonstrating inherent line-frequency stability.
Can the LM34910SD/NOPB operate without an external bootstrap capacitor?
No, the LM34910SD/NOPB requires a 0.022µF ceramic capacitor between BST and SW pins for proper high-side gate drive. This capacitor is charged through an internal diode during the off-time and supplies gate charge during the on-time. Omitting it prevents the N-channel buck switch from turning on fully, resulting in excessive RDS(on) loss, thermal runaway, and potential device failure - as confirmed by the PIN DESCRIPTIONS and APPLICATIONS INFORMATION sections of the SNVS297B datasheet.
What is the purpose of the ISEN and SGND pins on the LM34910SD/NOPB?
The ISEN and SGND pins on the LM34910SD/NOPB form the dedicated current-sense path for valley current limiting. ISEN receives recirculating current from the freewheeling diode during off-time, referenced to SGND - which is internally isolated from RTN to prevent noise injection into the regulation loop. Together they enable accurate 1.25A current limit detection with 130mΩ internal sense resistance, independent of output load or duty cycle.
Does the LM34910SD/NOPB require output capacitor ESR for stable operation?
Yes, the LM34910SD/NOPB requires ≥25mVp-p ripple voltage at the FB pin for reliable hysteretic regulation. This ripple is generated by inductor current flowing through the ESR of output capacitor C2 (plus optional R3). If C2's ESR is insufficient - common with low-ESR polymer or ceramic capacitors - an external series resistor (R3 <1Ω) must be added to meet the 25mV minimum, as explicitly stated in the Functional Description and APPLICATIONS INFORMATION sections.
LM34910SD/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WDFN 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):
- 8V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 33V
- Current - Output:
- 1.25A
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-WSON (4x4)
LM34910SD/NOPB FAQ
1.How can I place an order for LM34910SD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM34910SD/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 LM34910SD/NOPB reliable?
The price and inventory of LM34910SD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM34910SD/NOPB is usually 5 days.
3.What payment methods are accepted for LM34910SD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM34910SD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM34910SD/NOPB?
LM34910SD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM34910SD/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 LM34910SD/NOPB?
For technical support, including LM34910SD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM34910SD/NOPB requirements.
6.How does Aetrix verify that LM34910SD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM34910SD/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 LM34910SD/NOPB meets industry standards.
7.What is the process for return or replacement of LM34910SD/NOPB?
All LM34910SD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM34910SD/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 LM34910SD/NOPB part is unused and in its original packaging.
Return procedure for LM34910SD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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