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Texas Instruments LM34910CSDE/NOPB
- Part No.:
- LM34910CSDE/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WDFN Exposed Pad
- Datasheet:
-
LM34910CSDE/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.25A 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:692
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Product details
Overview
LM34910CSDE/NOPB from Texas Instruments is a high-voltage, 50V input, 1.25A synchronous step-down switching regulator with integrated 55V N-channel buck switch and hysteretic control architecture. It delivers regulated DC output in point-of-load applications, features no loop compensation, ultra-fast transient response, and operates across 8V–50V input range with 2.5V feedback reference.
For engineers reviewing the LM34910CSDE/NOPB datasheet, LM34910CSDE/NOPB pinout, LM34910CSDE/NOPB application, or LM34910CSDE/NOPB equivalent, key selection criteria include its fixed 2.5V FB threshold, valley current limit at 1.25A, WSON-10 thermal pad package, RON-based on-time programming, and self-biased VCC startup regulator.
Technical Context
The LM34910CSDE/NOPB implements a hysteretic on-time control scheme 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 over-voltage protection triggered at 2.875V.
Current limiting occurs during off-time via valley detection at ISEN–SGND, set to 1.25A by internal 130mΩ sense resistance. Startup uses an integrated 7.0V series regulator (VCC) with 5.8V UVLO, while gate drive employs bootstrap operation via BST–SW capacitor (0.022µF) and internal diode charging during off-time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8.0V to 50V - supports wide industrial and telecom input rails without external pre-regulation |
| Output Current Capability | 1.25A continuous - defined by valley current limit, enabling robust POL delivery |
| Feedback Reference | 2.5V ±2% - sets output via resistor divider; enables precise adjustable output voltage |
| Switch RDS(on) | 0.45Ω typical - low conduction loss for high efficiency at 1.25A load |
| Operating Frequency | Constant vs. load/VIN - enabled by on-time inverse to VIN; simplifies EMI filtering design |
| Softstart Current | 11.5µA - charges external SS capacitor linearly for controlled output ramp-up |
| VCC Regulator Output | 7.0V ±0.4V - powers internal circuitry; supports external bias to reduce dissipation |
| Thermal Shutdown | 175°C activation - protects device under overload or poor heatsinking conditions |
Pinout & Package
LM34910CSDE/NOPB is housed in a thermally enhanced 4 mm × 4 mm WSON-10 package with exposed thermal pad for improved heat dissipation. The package is RoHS-compliant, moisture-sensitive level-1, and rated for −40°C to +125°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switching Node | Connects to inductor, freewheeling diode, and BST capacitor; carries high di/dt switching current |
| 2 BST | Bootstrap Supply | Drives high-side gate via 0.022µF capacitor charged from VCC through internal diode during off-time |
| 3 ISEN | Current Sense Input | Senses recirculating current out of SGND; triggers 1.25A valley current limit shutdown |
| 4 SGND | Sense Ground | Return path for current-sense resistor; must be routed separately from power ground to avoid noise coupling |
| 5 RTN | Circuit Ground | Reference for internal comparators and logic; connects to system ground near FB/SS pins |
| 6 FB | Feedback Input | Compares output voltage (via R1/R2 divider) to 2.5V reference; requires ≥25mV ripple for regulation |
| 7 SS | Softstart Control | Internal 11.5µA current source ramps voltage to 2.5V; grounded during UVLO, thermal shutdown, or SD |
| 8 RON/SD | On-Time Set / Shutdown | Resistor from VIN sets tON; grounding disables regulator and resets softstart |
| 9 VCC | Startup Regulator Output | 7.0V supply for internal circuits; can accept external 8–14V bias to reduce dropout losses |
| 10 VIN | Main Input Supply | Accepts 8–50V input; withstands 55V transients; powers VCC regulator and switch driver |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Hysteretic control eliminates external compensation components, reducing BOM count and layout sensitivity |
| Ultra-fast transient response | On-demand switching with minimum 280ns off-time enables sub-microsecond recovery from load steps |
| Adjustable output voltage | Set via R1/R2 divider referenced to 2.5V FB pin; supports outputs from ~2.5V to >VIN×0.9 |
| Integrated start-up regulator | VCC provides self-bias from VIN; eliminates need for external bias supply in most applications |
| Exposed thermal pad | WSON-10 package includes bottom thermal pad soldered to PCB ground plane for <15°C/W θJA |
| Maximum duty cycle limiter | Prevents runaway during startup or short-circuit by capping on-time at safe levels |
Applications
| Telecom Secondary Post-Regulator | Industrial Point-of-Load Converter |
|---|---|
Use Scenario: Regulating 48V telecom bus down to 3.3V/5V for FPGA I/O banks or DSP core supplies. IC Role / Device Role / Timing Role: Primary buck controller delivering 1.25A with fast transient response to handle burst-mode digital loads. Use Value: Eliminates need for external VCC bias supply and compensation network, reducing board area by >30% versus compensated controllers. | Use Scenario: Powering PLC I/O modules from 24VDC industrial rail with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: High-efficiency, thermally robust step-down regulator operating continuously at 85°C ambient. Use Value: Exposed thermal pad and 0.45Ω RDS(on) enable full 1.25A output without forced air cooling. |
| High-Voltage Automotive Subsystem Supply | Test Equipment Auxiliary Rail Generator |
Use Scenario: Generating isolated 12V auxiliary supply from 42V battery rail in ADAS domain controllers. IC Role / Device Role / Timing Role: Non-isolated buck stage preceding isolated DC/DC; handles cold-crank (6V) to load-dump (60V) transients. Use Value: 50V max input rating and 55V absolute max VIN withstand capability ensure reliability across automotive transients. | Use Scenario: Providing programmable 5–15V rails in automated test equipment with rapid voltage sequencing requirements. IC Role / Device Role / Timing Role: Digitally adjustable output via RON/SD-controlled shutdown and FB divider reconfiguration. Use Value: Softstart (SS pin) and shutdown (RON/SD) enable precise power-up timing and rail sequencing without external logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QPWPRQ1 | 4.5–65V input, 1A, current-mode control, requires compensation, 1.5MHz fixed freq | Automotive AEC-Q100 qualified; higher VIN range but lower current rating | Choose for automotive-grade reliability and fixed-frequency EMI control; not drop-in due to different control architecture |
| TPS54202DDCR | 4.5–28V input, 2A, voltage-mode control, integrated compensation, 500kHz–1.7MHz | Narrower input range; higher current; requires external compensation components | Choose for lower-input systems needing higher output current and tighter VOUT tolerance; incompatible pinout and bias scheme |
Compared with LM34910CSDE/NOPB, LM5164QPWPRQ1 offers AEC-Q100 qualification and wider input range but sacrifices 0.25A current capability and adds compensation complexity; TPS54202DDCR delivers higher current and flexible frequency but cannot support >28V inputs or operate without compensation networks.
Availability
LM34910CSDE/NOPB is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and automotive subsystems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM34910CSDE/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 company headquartered in Dallas, Texas, designing and manufacturing analog and embedded processing chips for industrial, automotive, and communications markets.
The LM34910C product line delivers high-voltage, easy-to-use buck regulators targeting cost-sensitive, space-constrained point-of-load applications where fast transient response and minimal external components are critical.
FAQ
What is the maximum input voltage rating for the LM34910CSDE/NOPB?
The LM34910CSDE/NOPB has an absolute maximum VIN rating of 55V and is specified for continuous operation from 8.0V to 50V. Transient overvoltage events up to 55V are tolerated per Absolute Maximum Ratings, but sustained operation above 50V may trigger overvoltage protection or damage the internal 55V N-channel switch. Always maintain VIN ≤50V in normal operation to ensure reliability and meet datasheet specifications.
Does the LM34910CSDE/NOPB require external compensation components?
No, the LM34910CSDE/NOPB does not require external compensation components. Its hysteretic on-time control architecture eliminates the need for loop compensation networks, simplifying design and improving load transient response. This is confirmed in the datasheet Feature list ("No Loop Compensation Required") and Functional Description section, which states the control scheme "requires no loop compensation resulting in very fast load transient response."
How is the output voltage set on the LM34910CSDE/NOPB?
The output voltage of the LM34910CSDE/NOPB is set using a resistor divider (R1 and R2) connected between VOUT, FB, and RTN. The FB pin regulates to a precise 2.5V internal reference, so VOUT = 2.5 × (R1 + R2)/R2. Standard 1–10kΩ resistors are recommended, and the divider must provide ≥25mV ripple at FB for proper hysteretic regulation-often achieved via C2 ESR or added R3.
What is the purpose of the RON/SD pin on the LM34910CSDE/NOPB?
The RON/SD pin on the LM34910CSDE/NOPB serves dual functions: it sets the on-time via an external resistor (RON) connected from VIN, and acts as a shutdown input. When pulled below 0.65V, it disables the regulator, grounds the SS pin, and reduces bias current to ≤250µA. The on-time varies inversely with VIN and RON, enabling stable switching frequency across input and load variations.
Can the LM34910CSDE/NOPB operate without an external bootstrap capacitor?
No, the LM34910CSDE/NOPB cannot operate without an external bootstrap capacitor. A 0.022µF ceramic capacitor must be placed between BST and SW pins to supply gate drive voltage for the internal N-channel buck switch. The datasheet specifies this value in the PIN DESCRIPTIONS table and Figure 2, and omission causes gate drive failure, preventing switch turn-on and resulting in no output regulation.
LM34910CSDE/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):
- 50V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 45V
- 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)
LM34910CSDE/NOPB FAQ
1.How can I place an order for LM34910CSDE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM34910CSDE/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 LM34910CSDE/NOPB reliable?
The price and inventory of LM34910CSDE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM34910CSDE/NOPB is usually 5 days.
3.What payment methods are accepted for LM34910CSDE/NOPB?
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4.How is shipping managed for LM34910CSDE/NOPB?
LM34910CSDE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM34910CSDE/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 LM34910CSDE/NOPB?
For technical support, including LM34910CSDE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM34910CSDE/NOPB requirements.
6.How does Aetrix verify that LM34910CSDE/NOPB is sourced from the original manufacturer or authorized distributors?
All LM34910CSDE/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 LM34910CSDE/NOPB meets industry standards.
7.What is the process for return or replacement of LM34910CSDE/NOPB?
All LM34910CSDE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM34910CSDE/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 LM34910CSDE/NOPB part is unused and in its original packaging.
Return procedure for LM34910CSDE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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