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Texas Instruments LM34910CSDX/NOPB
- Part No.:
- LM34910CSDX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WDFN Exposed Pad
- Datasheet:
-
LM34910CSDX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.25A 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,587
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Product details
Overview
LM34910CSDX/NOPB from Texas Instruments is a high-voltage (8V–50V input), 1.25A valley-current-mode synchronous buck switching regulator with integrated 55V N-channel MOSFET, hysteretic control architecture, and no loop compensation required. It delivers stable 2.5V feedback regulation, operates at constant frequency across line/load variations, and supports telecommunication POL and secondary post-regulation applications.
For engineers reviewing the LM34910CSDX/NOPB datasheet, LM34910CSDX/NOPB pinout, LM34910CSDX/NOPB application, or LM34910CSDX/NOPB equivalent, key selection criteria include its 1.25A valley current limit, WSON-10 thermal pad package, 280 ns minimum off-time, 7V start-up regulator output, and RON-based on-time programming for frequency stability under varying VIN.
Technical Context
The LM34910CSDX/NOPB implements a hysteretic on-time control scheme where the buck switch on-duration is inversely proportional to VIN and set by an external RON resistor, enabling near-constant switching frequency (e.g., ~730 kHz at VIN = 50V, RON = 200 kΩ). Regulation relies on direct comparison of FB voltage to a precision 2.5V internal reference, with overvoltage protection triggered at 2.875V.
Current limiting occurs during the off-time via valley detection at ISEN, with threshold fixed at 1.25A and response time ≤150 ns. Thermal shutdown activates at 175°C with 20°C hysteresis, and gate drive UVLO ensures reliable switching down to BST–SW = 3.0V. The integrated start-up regulator delivers 7.0V (±0.4V) at up to 9 mA from VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8.0V to 50V - supports wide-range industrial and telecom inputs; absolute max 55V |
| Output Current Capability | 1.25A valley current limit - sets maximum sustainable load without foldback or hiccup |
| Feedback Reference | 2.5V ±60 mV - defines regulated output via external resistor divider (e.g., VOUT = 2.5 × (R1+R2)/R2) |
| Switch RDS(on) | 0.45 Ω typical - determines conduction loss and thermal rise at full load |
| Minimum Off-Time | 280 ns - ensures sufficient bootstrap capacitor recharge and limits max switching frequency |
| Start-Up Regulator Output | 7.0V ±0.4V - powers internal circuitry; can be bypassed with external 8–14V supply to reduce dissipation |
| Thermal Shutdown Threshold | 175°C - protects die integrity; resumes operation at ≈155°C after hysteresis |
Pinout & Package
LM34910CSDX/NOPB is housed in a thermally enhanced 4 mm × 4 mm WSON-10 package with exposed thermal pad for PCB heat sinking. Pin 1 is SW (switching node); pin 10 is VIN. The package meets RoHS and is rated for −40°C to +125°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switching node | Connects to inductor, freewheeling diode, and BST capacitor; carries high dv/dt and peak currents up to 3.5A |
| BST (2) | Bootstrap supply | Drives high-side gate via 0.022 µF capacitor to SW; internal diode recharges it each off-cycle |
| ISEN (3) | Valley current sense input | Detects recirculating current during off-time; triggers shutdown if >1.25A; connects to sense resistor to SGND |
| SGND (4) | Sense ground return | Provides low-impedance return path for current-sense resistor; separate from RTN to avoid noise coupling |
| RTN (5) | Circuit ground reference | Reference for internal comparators and logic; must be connected to system ground with minimal impedance |
| FB (6) | Feedback input | Compares output voltage (via resistor divider) to 2.5V reference; requires ≥25 mV ripple for stable hysteretic operation |
| SS (7) | Soft-start control | Internal 11.5 µA current source charges external capacitor to ramp output voltage; grounded during fault conditions |
| RON/SD (8) | On-time programming & shutdown | Resistor to VIN sets on-time; grounding disables regulator and resets soft-start |
| VCC (9) | Start-up regulator output | 7.0V supply for internal bias; can be externally powered (8–14V) to reduce dropout losses |
| VIN (10) | Main input supply | Accepts 8–50V DC; transient-rated to 55V; powers both switch and internal regulator |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Hysteretic control eliminates external compensation network, reducing BOM count and layout sensitivity |
| Ultra-fast transient response | On-time control and comparator-based regulation achieve sub-microsecond load step recovery |
| Adjustable output voltage | Set via two-resistor divider on FB pin; supports outputs from 2.5V to >20V depending on R1/R2 ratio |
| Thermally enhanced WSON-10 | Exposed pad enables direct thermal connection to PCB ground plane, improving power handling at 1.25A |
| Integrated start-up regulator | Eliminates need for external bias supply; self-powered from VIN, simplifying high-input-voltage designs |
Applications
| Telecom Point-of-Load Regulator | Industrial Secondary Post-Regulator |
|---|---|
Use Scenario: Regulating 48V telecom distribution bus down to 3.3V/5V for FPGA, ASIC, or DSP core supplies. IC Role / Device Role / Timing Role: Primary buck controller providing isolated, efficient, and fast-transient POL conversion with no external compensation. Use Value: Enables compact, high-efficiency single-stage conversion from 48V without intermediate 12V stage, reducing component count and board area. | Use Scenario: Stepping down 24V or 36V industrial bus voltage to 5V for microcontroller peripherals and sensors. IC Role / Device Role / Timing Role: High-voltage secondary regulator delivering stable 5V output with built-in current limiting and thermal protection. Use Value: Supports wide input range and harsh environments with guaranteed 1.25A delivery, eliminating need for discrete FET + controller solutions. |
| High-Voltage LED Driver Bias Supply | Automotive Infotainment Power Rail |
Use Scenario: Generating constant 12V bias for LED driver ICs in commercial lighting systems powered from 36V or 48V DC lines. IC Role / Device Role / Timing Role: Non-isolated buck converter supplying regulated bias rail with precise 2.5V feedback reference and overvoltage clamp at 2.875V. Use Value: Ensures LED driver ICs operate within safe voltage margins while maintaining fast transient immunity during dimming transitions. | Use Scenario: Providing 3.3V or 5V power to infotainment head unit processors and display interfaces in 24V truck/bus systems. IC Role / Device Role / Timing Role: Automotive-grade buck regulator supporting 8–50V input with thermal shutdown and gate UVLO for robust cold-crank and load-dump immunity. Use Value: Delivers reliable operation across automotive battery transients without requiring pre-regulation or complex protection circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QDDARQ1 | 4.5–65V input, 1A continuous, current-mode control, requires external compensation | Designed for AEC-Q100 automotive qualification; includes spread-spectrum and enhanced EMI features | Choose when automotive qualification, wider VIN, or lower quiescent current (<100 µA) is required; not pin-compatible |
| TPS54202HDDCR | 4.5–28V input, 2A, D-CAP3 control, integrated FETs, no external compensation | Optimized for low-VIN, high-efficiency POL; lacks high-voltage capability and valley current sensing | Prefer for sub-28V systems needing higher current and smaller solution size; incompatible with >28V inputs |
Compared with LM34910CSDX/NOPB, LM5164QDDARQ1 offers broader input range and automotive qualification but adds complexity with external compensation, while TPS54202HDDCR delivers higher current at lower VIN but cannot replace it in 48V telecom or industrial applications due to voltage limitation.
Availability
LM34910CSDX/NOPB is available at Aetrix Electronics and suitable for telecom point-of-load, industrial secondary post-regulation, and high-voltage LED bias supply applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM34910CSDX/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 LM34910C product line delivers high-voltage, integrated buck regulators optimized for efficiency, simplicity, and thermal performance in space-constrained industrial and telecom power systems.
FAQ
What is the maximum input voltage rating for LM34910CSDX/NOPB?
The LM34910CSDX/NOPB has an absolute maximum input voltage rating of 55V, with recommended continuous operation from 8.0V to 50V. Exceeding 50V may trigger overvoltage stress on internal components, and operation above 55V risks permanent damage per Absolute Maximum Ratings. Transient spikes up to 55V are tolerated per datasheet specifications.
Does LM34910CSDX/NOPB require external compensation components?
No, LM34910CSDX/NOPB uses a hysteretic on-time control architecture that eliminates the need for external compensation networks. Its regulation relies on direct comparison of FB voltage to a 2.5V internal reference and programmable on-time via RON, simplifying design and improving transient response without loop stability concerns.
How is the switching frequency determined for LM34910CSDX/NOPB?
The LM34910CSDX/NOPB switching frequency is set by the on-time (determined by VIN and external RON resistor) and minimum off-time (280 ns). For example, with VIN = 24V and RON = 200 kΩ, typical on-time is 2.75 µs, yielding ≈300 kHz. Frequency remains relatively constant across line and load due to inverse VIN–on-time relationship.
Can LM34910CSDX/NOPB be used in automotive applications?
LM34910CSDX/NOPB is not AEC-Q100 qualified and lacks automotive-specific features like extended temperature validation or enhanced EMI control. While it operates from −40°C to +125°C and handles 50V inputs, TI recommends LM5164QDDARQ1 for automotive use. LM34910CSDX/NOPB is intended for industrial and telecom systems.
What is the purpose of the ISEN pin on LM34910CSDX/NOPB?
The ISEN pin on LM34910CSDX/NOPB senses recirculating current during the off-time to implement valley current limiting at 1.25A. It connects to the low-side of an external current-sense resistor tied to SGND. When current exceeds the threshold, the device extends off-time to prevent overcurrent, ensuring robust short-circuit and overload protection without foldback.
LM34910CSDX/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)
LM34910CSDX/NOPB FAQ
1.How can I place an order for LM34910CSDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM34910CSDX/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 LM34910CSDX/NOPB reliable?
The price and inventory of LM34910CSDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM34910CSDX/NOPB is usually 5 days.
3.What payment methods are accepted for LM34910CSDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM34910CSDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM34910CSDX/NOPB?
LM34910CSDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM34910CSDX/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 LM34910CSDX/NOPB?
For technical support, including LM34910CSDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM34910CSDX/NOPB requirements.
6.How does Aetrix verify that LM34910CSDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM34910CSDX/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 LM34910CSDX/NOPB meets industry standards.
7.What is the process for return or replacement of LM34910CSDX/NOPB?
All LM34910CSDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM34910CSDX/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 LM34910CSDX/NOPB part is unused and in its original packaging.
Return procedure for LM34910CSDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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