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Texas Instruments LM34919TL/NOPB
- Part No.:
- LM34919TL/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WFBGA
- Datasheet:
-
LM34919TL/NOPB.pdf
- Description:
- IC REG BUCK ADJ 600MA 10DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:236
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Product details
Overview
LM34919TL/NOPB from Texas Instruments is a constant on-time, 8V–40V input, 600-mA synchronous buck switching regulator with integrated N-channel MOSFET, 2.5V internal reference, and valley current limit of 0.64 A. It operates up to 2.0 MHz and delivers high-efficiency point-of-load regulation in ultra-small 10-pin DSBGA packaging for space-constrained industrial power rails.
For engineers reviewing the LM34919TL/NOPB datasheet, LM34919TL/NOPB pinout, LM34919TL/NOPB application, or LM34919TL/NOPB equivalent, key selection considerations include its VIN range (8–40 V), programmable on-time via RON resistor, no-loop-compensation architecture, thermal shutdown at 175°C, and bootstrap-driven gate drive requiring 0.022 µF BST capacitor.
Technical Context
The LM34919TL/NOPB implements a constant on-time control scheme where tON is inversely proportional to VIN and set by an external RON resistor - enabling stable switching frequency across line and load variations. Its valley current limit detection circuit monitors recirculating current at ISEN to enforce 0.64 A peak current without foldback.
It integrates a self-biased 7.0 V start-up regulator (VCC), soft-start via SS pin with 10.5 µA internal current source, and dual UVLO protection on VCC (5.7 V) and gate drive (4.4 V). The 10-pin DSBGA package supports compact layout with dedicated sense ground (SGND) and BST pin for high-side gate drive bootstrapping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8.0 V to 40 V - supports wide industrial and telecom input rails without external pre-regulation. |
| Output Current Capability | 600 mA continuous - limited by 0.64 A valley current threshold and thermal design margin. |
| Switching Frequency | Up to 2.0 MHz - enables use of small inductors (e.g., 15 µH) and ceramic output capacitors. |
| Feedback Reference Voltage | 2.50 V ±1.2% - sets output voltage via external resistor divider (VOUT = 2.5 × (R1+R2)/R2). |
| On-Time Programmability | Configured by RON resistor - e.g., 43.2 kΩ yields ~806 kHz at VIN = 8 V; tON ranges from 700 ns to 3.5 µs. |
| Thermal Shutdown Threshold | 175°C with 20°C hysteresis - protects against sustained overload or poor PCB thermal design. |
| VCC Regulator Output | 7.0 V ±0.4 V - powers internal logic and gate driver; supports external bias (7–14 V) to reduce dissipation. |
Pinout & Package
LM34919TL/NOPB is housed in a 10-pin 2.0 mm × 1.6 mm DSBGA (Die Size Ball Grid Array) package with 0.5 mm pitch, optimized for minimal PCB area and thermal performance in high-density layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RON/SD | On-time programming & shutdown control | Resistor from VIN sets tON; grounding disables regulator and discharges SS capacitor. |
| RTN | Main circuit ground | Reference for all internal circuitry except current sensing; connects to system return plane. |
| FB | Feedback input | Compares output ripple to 2.5 V reference; requires ≥25 mVpp ripple for stable regulation. |
| SGND | Sense ground | Return path for current-sense signal; must be routed separately from RTN to avoid noise coupling. |
| SS | Soft-start timing node | Charged by 10.5 µA current source to 2.5 V; controls output ramp rate (e.g., 0.022 µF → 5 ms). |
| ISEN | Current sense output | Carries recirculating diode current; used with external sense resistor to implement valley current limit. |
| VCC | Startup regulator output | 7.0 V supply for internal circuits; can be externally biased to reduce power loss at high VIN. |
| VIN | Main input supply | Accepts 8–40 V DC; absolute max 44 V transient rating supports harsh industrial environments. |
| SW | Switching node | Connects to inductor, freewheeling diode, and BST capacitor; swings between VIN and −1.5 V. |
| BST | Bootstrap capacitor connection | Requires 0.022 µF ceramic cap to SW; enables floating high-side gate drive for N-MOSFET switch. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Constant on-time architecture eliminates external compensation network - reduces BOM count and layout sensitivity. |
| Ultra-fast transient response | On-time retriggering on FB dip enables sub-microsecond recovery from load steps - critical for POL applications. |
| Valley current limiting | 0.64 A threshold enforced during off-time prevents destructive inrush while avoiding foldback instability under short-circuit. |
| Integrated start-up regulator | Self-powered VCC generation from VIN eliminates need for auxiliary bias supply - simplifies system-level power sequencing. |
| Thermal and UVLO protection | Dual safeguards: VCC UVLO (5.7 V) prevents erratic operation; junction thermal shutdown (175°C) avoids permanent damage. |
Applications
| Industrial Point-of-Load Regulation | Telecom Secondary Post-Regulation |
|---|---|
|
Use Scenario: Powering FPGA I/O banks or microcontroller cores from 12–48 V backplane rails in programmable logic controllers. IC Role / Device Role / Timing Role: Primary buck converter delivering tightly regulated 3.3 V or 5 V at up to 600 mA with fast load-step response. Use Value: Eliminates need for external compensation and reduces solution size by >30% vs. voltage-mode controllers in same footprint. |
Use Scenario: Generating isolated 5 V bias from 48 V telecom distribution bus for optical transceiver modules. IC Role / Device Role / Timing Role: Non-isolated secondary regulator following primary DC/DC stage; handles variable load from 10 mA to full 600 mA. Use Value: Maintains stable 2.0 MHz operation across 8–40 V input range - avoids audible noise and simplifies EMI filtering. |
| High-Voltage Automotive Subsystem Supply | Embedded Sensor Hub Power Management |
|
Use Scenario: Providing 3.3 V supply to CAN transceivers and LIN controllers in 24 V vehicle battery systems with cold-crank tolerance. IC Role / Device Role / Timing Role: Input-tolerant buck regulator surviving 44 V transients; uses valley current limit to prevent MOSFET failure during load dump. Use Value: Operates down to 8 V input - supports engine cranking events without dropout; thermal shutdown prevents overheating in sealed enclosures. |
Use Scenario: Powering MEMS accelerometers, environmental sensors, and low-power MCUs in compact IoT edge nodes. IC Role / Device Role / Timing Role: Compact POL regulator on sensor module PCB; leverages DSBGA package for minimal board area. Use Value: 75 µA shutdown current (ISD) extends battery life; soft-start prevents inrush into stacked ceramic output caps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QPWPRQ1 | Wider 4.5–65 V input, 1 A output, but requires external compensation and larger SOIC-10 package. | Automotive AEC-Q100 qualified; supports higher VIN and current, but lacks DSBGA footprint. | Select when automotive qualification or >40 V input is mandatory; accept added layout complexity and compensation tuning. |
| TPS54202DDCR | Lower 4.5–28 V input, 2 A output, current-mode control with internal compensation; 6-pin SOT-23 package. | Optimized for cost-sensitive consumer applications; not rated for >40 V or industrial temperature range. | Choose for lower-cost, lower-voltage designs where 28 V max input suffices and 2 A output is needed. |
Compared with LM34919TL/NOPB, LM5164QPWPRQ1 offers extended input range and automotive qualification but demands external loop compensation and occupies more PCB area, while TPS54202DDCR provides higher output current in a smaller SOT-23 but cannot support 40 V input or industrial ambient temperatures.
Availability
LM34919TL/NOPB is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and automotive subsystems requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.
Supply support for LM34919TL/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 LM34919TL/NOPB belongs to TI's high-voltage buck regulator product line, engineered for compact, efficient point-of-load conversion in industrial and telecom systems where input voltage exceeds 24 V and board space is constrained.
FAQ
What is the minimum input voltage required for reliable startup of the LM34919TL/NOPB?
The LM34919TL/NOPB requires a minimum input voltage of 8.0 V to ensure the internal VCC regulator reaches its 5.7 V under-voltage lockout threshold. Below this, the device remains disabled. At VIN = 8 V, the VCC dropout voltage is 1.2 V, so VCC reaches regulation only when VIN exceeds ≈6.9 V - but functional operation begins reliably at 8.0 V per datasheet operating ratings. The LM34919TL/NOPB will not initiate soft-start or switching below this threshold.
How does the LM34919TL/NOPB achieve constant switching frequency across varying input voltage and load conditions?
The LM34919TL/NOPB uses a constant on-time control architecture where tON is inversely proportional to VIN and set by the RON resistor. As VIN increases, tON decreases, maintaining near-constant frequency despite changes in duty cycle. This eliminates need for loop compensation and ensures stable operation from light to full load. The LM34919TL/NOPB achieves this without feedback loop tuning - a key differentiator from voltage-mode or current-mode regulators.
Can the LM34919TL/NOPB operate without an external bootstrap capacitor?
No - the LM34919TL/NOPB requires a 0.022 µF ceramic capacitor between BST and SW pins to enable high-side N-MOSFET gate drive. Without it, the internal bootstrap diode cannot recharge the gate drive supply during off-time, causing immediate loss of switching capability. The LM34919TL/NOPB datasheet explicitly specifies this capacitor as mandatory; omitting it results in complete functional failure, not degraded performance.
What is the purpose of the ISEN and SGND pins on the LM34919TL/NOPB, and how should they be routed?
The ISEN pin carries recirculating current from the freewheeling diode during off-time to enable valley current limiting at 0.64 A. SGND is the dedicated return path for that current and must be routed as a separate low-impedance trace to the current-sense resistor - not shared with RTN - to prevent noise coupling into the current-limit comparator. Incorrect routing of ISEN or merging SGND with RTN causes premature current-limit triggering or regulation instability in the LM34919TL/NOPB.
Does the LM34919TL/NOPB support adjustable soft-start time, and how is it configured?
Yes - soft-start time is fully adjustable via an external capacitor on the SS pin. An internal 10.5 µA current source charges the capacitor to 2.5 V; soft-start duration tSS = (2.5 V × CSS) / 10.5 µA. For example, 0.022 µF yields ≈5.2 ms. The LM34919TL/NOPB also grounds SS internally during shutdown or VCC UVLO, ensuring controlled restart behavior. No resistor is needed - only the capacitor determines ramp rate.
LM34919TL/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFBGA
- 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):
- 40V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 35V
- Current - Output:
- 600mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DSBGA
LM34919TL/NOPB FAQ
1.How can I place an order for LM34919TL/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM34919TL/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 LM34919TL/NOPB reliable?
The price and inventory of LM34919TL/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM34919TL/NOPB is usually 5 days.
3.What payment methods are accepted for LM34919TL/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM34919TL/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM34919TL/NOPB?
LM34919TL/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM34919TL/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 LM34919TL/NOPB?
For technical support, including LM34919TL/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM34919TL/NOPB requirements.
6.How does Aetrix verify that LM34919TL/NOPB is sourced from the original manufacturer or authorized distributors?
All LM34919TL/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 LM34919TL/NOPB meets industry standards.
7.What is the process for return or replacement of LM34919TL/NOPB?
All LM34919TL/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM34919TL/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 LM34919TL/NOPB part is unused and in its original packaging.
Return procedure for LM34919TL/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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