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Texas Instruments LM34910CSD/NOPB
- Part No.:
- LM34910CSD/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WDFN Exposed Pad
- Datasheet:
-
LM34910CSD/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.25A 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:5,633
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Product details
Overview
LM34910CSD/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 operates across 8V–50V input, delivers adjustable output voltage via FB pin (2.5V reference), features valley current limiting at 1.25A, and targets point-of-load regulation in telecom and industrial power systems.
For engineers reviewing the LM34910CSD/NOPB datasheet, LM34910CSD/NOPB pinout, LM34910CSD/NOPB application, or LM34910CSD/NOPB equivalent, key selection considerations include its WSON-10 package thermal performance, no-loop-compensation hysteretic operation, VIN-to-on-time inverse relationship for stable frequency, 280 ns minimum off-time, and integrated start-up regulator delivering 7.0V VCC.
Technical Context
The LM34910CSD/NOPB implements a fixed-frequency hysteretic control scheme where on-time is programmable via external RON resistor and inversely proportional to VIN-enabling stable switching frequency across line and load variations. Its valley current limit detection occurs during off-time by monitoring recirculating current through ISEN–SGND (130 mΩ internal sense resistance), triggering shutdown if current exceeds 1.25A.
Regulation relies on feedback comparison of FB voltage against a precision 2.5V internal reference; over-voltage protection activates at 2.875V. The device integrates a self-biased start-up regulator (7.0V ±0.4V, 9 mA current-limited) and gate drive UVLO (4.3V threshold), with thermal shutdown at 175°C and 20°C hysteresis.
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 | 1.25A continuous - defined by valley current limit; peak switch current up to 3.5A |
| Feedback Reference | 2.500V ±60mV - sets regulated output via R1/R2 divider; enables precise adjustable VOUT |
| Switch RDS(on) | 0.45Ω typical - low conduction loss at 200mA test current; enables high efficiency at full load |
| Minimum Off-Time | 280 ns - ensures reliable bootstrap capacitor recharge and stable operation at high VIN |
| Softstart Current | 11.5 µA - charges external SS capacitor linearly to 2.5V for controlled startup ramp |
| VCC Regulator Output | 7.0V ±0.4V - powers internal circuitry; externally biasable (8V–14V) to reduce dissipation |
Pinout & Package
LM34910CSD/NOPB is housed in a thermally enhanced 4 mm × 4 mm WSON-10 package with exposed thermal pad for improved heat dissipation. Pin numbering follows standard top-view orientation with Pin 1 at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switching Node | Connects to inductor, freewheeling diode, and BST capacitor; carries high dI/dt ripple current |
| 2 BST | Bootstrap Supply | Drives high-side gate via 0.022 µF capacitor to SW; internal diode enables recharge during off-time |
| 3 ISEN | Current Sense Input | Senses recirculating current during off-time; internal 130 mΩ resistor sets 1.25A valley limit |
| 4 SGND | Sense Ground | Return path for current-sense circuitry; must be routed separately from RTN to avoid noise coupling |
| 5 RTN | Circuit Ground | Reference for internal comparators and logic; connects to system ground near output capacitor |
| 6 FB | Feedback Input | Compares output voltage (via R1/R2) to 2.5V reference; requires ≥25 mVpp ripple for stable regulation |
| 7 SS | Softstart Control | Internal 11.5 µA current source ramps voltage to 2.5V; grounded during UVLO or thermal shutdown |
| 8 RON/SD | On-Time Set & Shutdown | Resistor from VIN sets on-time; grounding disables regulator and resets softstart |
| 9 VCC | Start-Up Regulator Output | 7.0V supply for internal circuits; can be externally biased (8V–14V) to bypass internal regulator |
| 10 VIN | Main Input Supply | Accepts 8V–50V; internal 55V-rated switch enables robust transient handling |
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 280 ns minimum off-time enables immediate reaction to load steps without phase-margin trade-offs |
| Constant frequency vs. load/VIN | Inverse VIN–on-time relationship maintains stable operating frequency across 8V–50V input and full 0–1.25A load range |
| Integrated start-up regulator | Self-powered 7.0V VCC rail eliminates need for auxiliary bias supply in most applications |
| Thermal shutdown with hysteresis | 175°C trip with 20°C hysteresis prevents thermal cycling and enables safe recovery without manual reset |
Applications
| High-Efficiency Point-of-Load Regulator | Non-Isolated Telecom Buck Regulator |
|---|---|
Use Scenario: Powering FPGA I/O banks or ASIC core rails in compact base station cards where space and thermal headroom are constrained. IC Role / Device Role / Timing Role: Primary DC-DC converter delivering tightly regulated 1.2V–5V outputs from 12V/24V/48V backplane supplies. Use Value: Delivers >90% efficiency at 1.25A with minimal external components; WSON-10 thermal pad enables direct PCB copper pour cooling. | Use Scenario: Secondary regulation stage in telecom power modules converting -48V or +48V intermediate bus to 3.3V/5V for interface ICs. IC Role / Device Role / Timing Role: High-input-voltage buck controller managing transient-heavy loads like Ethernet PHYs and SerDes transceivers. Use Value: 50V rating and 1.25A current limit ensure reliable operation during line surges; fast transient response maintains signal integrity under burst traffic. |
| Secondary High-Voltage Post Regulator | Industrial Sensor Signal Chain Supply |
Use Scenario: Down-converting 36V–50V industrial bus voltage to 3.3V for microcontrollers and analog front-ends in motor drives or PLC I/O modules. IC Role / Device Role / Timing Role: Isolation-free local regulator replacing discrete buck controllers in cost-sensitive, space-constrained designs. Use Value: Integrated 55V switch and no-compensation design reduce component count and qualification effort versus discrete solutions. | Use Scenario: Providing clean, low-noise 5V supply for precision ADCs, DACs, and op-amps in factory automation sensors. IC Role / Device Role / Timing Role: Low-ripple, high-PSRR post-regulator leveraging FB ripple requirement and optional R3 damping network. Use Value: Adjustable output and 2.5V reference enable accurate scaling; softstart prevents sensor initialization faults during power-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QWRXMRQ1 | Automotive-grade (AEC-Q100), 100V input, 0.6A output, current-mode control requiring compensation | Targets automotive infotainment and ADAS; higher VIN rating but lower current capability | Choose for automotive environments requiring extended temperature and qualification; not drop-in due to different control architecture and pinout |
| TPS54202DRCT | 4.5V–28V input, 2A output, voltage-mode PWM with integrated compensation, smaller 3mm × 2mm WSON | Optimized for low-VIN consumer and computing applications; lacks high-VIN capability and valley current sensing | Prefer for <30V systems needing higher current and simpler layout; incompatible with 48V telecom or industrial buses |
Compared with LM34910CSD/NOPB, LM5164QWRXMRQ1 offers AEC-Q100 qualification and 100V tolerance but sacrifices 1.25A current delivery and adds compensation complexity, while TPS54202DRCT provides higher output current and smaller footprint at the cost of 50V input support and hysteretic simplicity-making LM34910CSD/NOPB optimal for unregulated 48V-derived POL where fast transients and minimal BOM matter most.
Availability
LM34910CSD/NOPB is available at Aetrix Electronics and suitable for high-voltage point-of-load regulation, telecom secondary conversion, and industrial post-regulation requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for LM34910CSD/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-input-voltage, no-compensation buck regulators targeting cost-sensitive, thermally constrained applications in telecom infrastructure, industrial automation, and distributed power architectures.
FAQ
What is the maximum input voltage rating for the LM34910CSD/NOPB?
The LM34910CSD/NOPB has an absolute maximum input voltage (VIN to GND) rating of 55V, with recommended operating range from 8.0V to 50V. Exceeding 55V risks permanent damage. Transient spikes up to 55V are tolerated per datasheet specifications, but sustained operation above 50V is not advised. The internal 55V N-channel buck switch defines this limit, and the BST-to-SW rating of 14V further constrains bootstrapping integrity.
Does the LM34910CSD/NOPB require external compensation components?
No, the LM34910CSD/NOPB uses a hysteretic control architecture that eliminates the need for external compensation networks. Regulation is achieved by comparing FB voltage to a 2.5V internal reference and initiating fixed on-times based on VIN and RON. This simplifies design, reduces component count, and delivers ultra-fast transient response without stability analysis-unlike voltage-mode or current-mode PWM controllers such as the TPS54202DRCT.
How is output voltage adjusted on the LM34910CSD/NOPB?
Output voltage is set using a resistive divider (R1 and R2) from VOUT to FB and FB to RTN. The LM34910CSD/NOPB regulates when FB = 2.5V, so VOUT = 2.5 × (1 + R1/R2). Standard 1% resistors in the 1kΩ–10kΩ range are recommended. For example, R1 = 7.5kΩ and R2 = 5kΩ yields VOUT = 6.25V. The FB pin draws only 100nA, minimizing divider current error.
What is the purpose of the ISEN pin on the LM34910CSD/NOPB?
ISEN monitors recirculating inductor current during the off-time to implement valley current limiting at 1.25A. Internally, it connects to SGND through a 130 mΩ sense resistor. When current flowing out of ISEN exceeds 1.25A, the current limit comparator holds the buck switch off until current decays. This protects against overload and short-circuit conditions without requiring a separate sense resistor-though an external resistor between SGND and ISEN can raise the limit.
Can the LM34910CSD/NOPB be shut down remotely?
Yes, the LM34910CSD/NOPB supports remote shutdown via the RON/SD pin. Pulling RON/SD below 0.65V (typical) disables the regulator: the on-timer halts, SS is internally grounded, and quiescent current drops to 80–250 µA. Releasing RON/SD (to >1.1V) restores normal operation. This pin also programs on-time when biased with a resistor from VIN, enabling frequency tuning across input voltage ranges.
LM34910CSD/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)
LM34910CSD/NOPB FAQ
1.How can I place an order for LM34910CSD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM34910CSD/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 LM34910CSD/NOPB reliable?
The price and inventory of LM34910CSD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM34910CSD/NOPB is usually 5 days.
3.What payment methods are accepted for LM34910CSD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM34910CSD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM34910CSD/NOPB?
LM34910CSD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM34910CSD/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 LM34910CSD/NOPB?
For technical support, including LM34910CSD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM34910CSD/NOPB requirements.
6.How does Aetrix verify that LM34910CSD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM34910CSD/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 LM34910CSD/NOPB meets industry standards.
7.What is the process for return or replacement of LM34910CSD/NOPB?
All LM34910CSD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM34910CSD/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 LM34910CSD/NOPB part is unused and in its original packaging.
Return procedure for LM34910CSD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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