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Texas Instruments LM34919BTLX/NOPB
- Part No.:
- LM34919BTLX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WFBGA
- Datasheet:
-
LM34919BTLX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 600MA 10DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,402
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Product details
Overview
LM34919BTLX/NOPB from Texas Instruments is a 6V–40V input, 600-mA constant-on-time synchronous buck switching regulator in a 10-pin DSBGA package, featuring integrated N-channel buck switch, valley current limit at 0.64 A, 2.5 V feedback reference, and 2.6 MHz maximum switching frequency - used as a high-efficiency point-of-load regulator in automotive infotainment power rails.
For engineers reviewing the LM34919BTLX/NOPB datasheet, LM34919BTLX/NOPB pinout, LM34919BTLX/NOPB application, or LM34919BTLX/NOPB equivalent, key selection criteria include input voltage range (6–40 V), adjustable output via FB resistor divider, no-loop-compensation architecture, thermal shutdown at 175°C, and RON/SD-controlled shutdown with softstart.
Technical Context
The LM34919BTLX/NOPB implements a constant-on-time (COT) control scheme where on-time is programmable via external RON resistor and inversely scales with VIN, enabling stable switching frequency across line and load variations. Its regulation loop compares FB voltage to a precision 2.5 V internal reference without requiring external compensation components.
Current limiting operates via valley detection at ISEN pin with 0.64 A threshold and 50 ns response time; startup uses an integrated 7.0 V VCC regulator with UVLO at 5.25 V; gate drive relies on BST–SW bootstrap capacitor (0.022 µF) and features gate UVLO at 3.2–4.4 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 40 V - supports direct connection to automotive battery rails with transient tolerance up to 44 V. |
| Output Current Capability | 600 mA continuous - limited by valley current sense at 0.64 A and thermal design (θJA = 61°C/W). |
| Switching Frequency | Up to 2.6 MHz - programmable via RON resistor; remains stable across input voltage and load changes. |
| Feedback Reference Voltage | 2.5 V ±1.2% - sets regulated output via external resistor divider (e.g., 3.3 V with R1/R2 = 0.32). |
| On-Time Programmability | Configurable via RON resistor - e.g., 28 kΩ yields ~1.49 MHz at VIN = 6–24 V. |
| Thermal Shutdown Threshold | 175°C with 20°C hysteresis - disables buck switch until junction cools to ~155°C. |
| VCC Startup Regulator | 7.0 V ±0.4 V, 15 mA current-limited - powers internal circuitry; supports external bias (7–14 V) to reduce dissipation. |
Pinout & Package
LM34919BTLX/NOPB is housed in a 10-pin DSBGA (Die Size Ball Grid Array) package measuring 1.5 mm × 1.5 mm with 0.4 mm pitch, optimized for ultra-compact automotive and space-constrained POL applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1: RON/SD | On-time programming & shutdown control | Resistor from VIN sets on-time; grounding forces shutdown and discharges SS capacitor. |
| A2: RTN | Main circuit ground reference | Reference for all internal circuitry except current sensing; connects to system ground plane. |
| A3: FB | Feedback input | Compares output-derived voltage to 2.5 V reference; requires ≥25 mVpp ripple for stable COT operation. |
| B1: SGND | Sense ground return | Carries recirculating inductor current to internal sense resistor; must be routed separately from RTN to avoid noise coupling. |
| B3: SS | Softstart timing node | Internal 10.5 µA current source charges external capacitor to 2.5 V; controls output ramp rate. |
| C1: ISEN | Current sense output | Outputs recirculating current during off-time; triggers valley current limit when >0.64 A. |
| C3: VCC | Startup regulator output | Supplies 7.0 V to internal logic/gate driver; can accept external 7–14 V bias to reduce thermal load. |
| D1: VIN | Main input supply | Accepts 6–40 V DC; includes 44 V absolute max rating and internal VCC UVLO protection. |
| D2: SW | Switching node | Connects to inductor, freewheeling diode, and BST capacitor; swings between VIN and ~−1 V during off-time. |
| D3: BST | Bootstrap supply | Charged from VCC via internal diode during off-time; supplies gate drive voltage for high-side N-FET. |
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 adjustment per cycle enables sub-microsecond recovery from load steps - critical for processor core rail stability. |
| Integrated startup regulator | Self-biased 7.0 V VCC output eliminates need for auxiliary bias supply - simplifies system-level power sequencing. |
| Valley current limit at 0.64 A | Accurate overcurrent protection without foldback - maintains regulation during overload until thermal shutdown activates. |
| Adjustable output voltage | Set via standard resistor divider on FB pin - supports 3.3 V, 5 V, or custom outputs using 1–10 kΩ standard values. |
| Thermal shutdown with hysteresis | 175°C trip / 155°C recovery prevents thermal runaway while avoiding oscillation near limit temperature. |
Applications
| Automotive Infotainment Power Supply | Industrial Point-of-Load Converter |
|---|---|
Use Scenario: Powers DSP, display controller, and audio codec in head-unit systems with 12 V battery input and 3.3 V/500 mA rail requirement. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 3.3 V output; provides fast transient response to burst-mode processing loads. Use Value: Eliminates need for external compensation and reduces solution size by 30% vs. voltage-mode controllers - critical for tight dashboard PCB real estate. |
Use Scenario: Generates 5 V @ 600 mA from 24 V industrial bus for PLC I/O modules operating in −40°C to +125°C ambient. IC Role / Device Role / Timing Role: High-voltage buck converter with AEC-Q100 Grade 1 qualification - ensures reliability in harsh thermal environments. Use Value: Integrated 40 V N-FET and 7 V VCC regulator enable single-chip solution - avoids discrete FET + controller complexity and layout risk. |
| Telecom Secondary Regulator | Secondary HV Post-Regulator |
Use Scenario: Steps down 48 V telecom intermediate bus to 3.3 V for FPGA configuration and management ICs in base station equipment. IC Role / Device Role / Timing Role: Non-isolated secondary buck stage operating at 2.1 MHz - minimizes EMI and allows small passive component selection. Use Value: 2.6 MHz max frequency enables use of 4.7 µH inductors and 10 µF ceramic output caps - cuts board area by >40% vs. 500 kHz designs. |
Use Scenario: Provides clean 12 V bias from 40 V HV rail for op-amps and ADC drivers in test instrumentation front-ends. IC Role / Device Role / Timing Role: High-precision post-regulator with 2.5 V reference (±1.2%) and <1 nA FB bias current - preserves signal chain accuracy. Use Value: Low quiescent current (1.0 mA) and valley current limit prevent output collapse during sensor fault conditions - enhances system robustness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM34919BQDSGRQ1 | AEC-Q100 Grade 1 qualified; identical electrical specs but automotive-grade screening and enhanced ESD (2 kV HBM). | Required for safety-critical automotive modules (e.g., ADAS camera power); not needed for industrial/commercial use. | Select LM34919BQDSGRQ1 only if AEC-Q100 compliance is mandated; LM34919BTLX/NOPB suffices for non-automotive designs. |
| TPS54202HDDCR | 4.5–28 V input, 2 A output, 2.5 V reference, but uses voltage-mode control with external compensation. | Higher current capability and wider temp range (−40°C to +150°C), but larger solution size and slower transient response. | Choose TPS54202HDDCR when >600 mA load or extended junction temperature (>125°C) is required; LM34919BTLX/NOPB preferred for compact 600 mA POL. |
Compared with LM34919BQDSGRQ1, the LM34919BTLX/NOPB offers identical regulation performance at lower cost and without automotive qualification overhead; versus TPS54202HDDCR, it delivers smaller footprint and faster transients but lower current and narrower input range.
Availability
LM34919BTLX/NOPB is available at Aetrix Electronics and suitable for automotive infotainment, industrial point-of-load, and telecom secondary regulator applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM34919BTLX/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 ICs, with decades of expertise in high-reliability automotive and industrial power solutions.
The LM34919BTLX/NOPB belongs to TI's high-voltage buck regulator product line, designed specifically for compact, high-efficiency DC-DC conversion in space-constrained 6–40 V systems where fast transient response and minimal external components are critical.
FAQ
What is the minimum input voltage required for reliable startup of the LM34919BTLX/NOPB?
The LM34919BTLX/NOPB requires VIN ≥ 6.0 V for normal operation, but its VCC UVLO falling threshold is 5.1 V. Below this, the internal startup regulator shuts down. If VCC is externally biased (7–14 V), the effective minimum VIN drops to ~3 V - however, the datasheet specifies 6 V as the guaranteed operational lower limit for LM34919BTLX/NOPB under all conditions.
Can the LM34919BTLX/NOPB operate without an external bootstrap capacitor?
No - the LM34919BTLX/NOPB requires a 0.022 µF ceramic capacitor between BST and SW pins to sustain gate drive for the integrated N-channel buck switch. Omitting C4 causes immediate gate drive failure and unregulated output. The internal bootstrap diode charges C4 during each off-time; no alternative bias path exists for the high-side driver in LM34919BTLX/NOPB.
How does the LM34919BTLX/NOPB achieve constant switching frequency despite varying input voltage?
The LM34919BTLX/NOPB uses a constant-on-time (COT) architecture where on-time tON scales inversely with VIN (tON ∝ 1/VIN). As VIN increases, tON shortens; as VIN decreases, tON lengthens - maintaining nearly fixed fSW = 1/(tON + tOFF) across 6–40 V input. This behavior is confirmed in Figure 9 of the LM34919BTLX/NOPB datasheet.
What is the purpose of the R3 resistor in the LM34919BTLX/NOPB feedback network?
R3 in series with C2 creates intentional ESR-like ripple at the FB pin - ensuring ≥25 mVpp AC signal required for stable COT operation. Without sufficient ripple, the LM34919BTLX/NOPB may exhibit subharmonic oscillation or poor regulation. R3 value is calculated based on minimum inductor ripple current and FB divider ratio per Equation 13 in the LM34919BTLX/NOPB datasheet.
Does the LM34919BTLX/NOPB support forced PWM mode or discontinuous conduction mode (DCM)?
The LM34919BTLX/NOPB automatically transitions between continuous conduction mode (CCM) at heavy loads and discontinuous conduction mode (DCM) at light loads - no external mode-select pin exists. In DCM, switching frequency decreases with load, improving light-load efficiency. Forced PWM is not supported; the device relies on natural valley-current-based boundary detection.
LM34919BTLX/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):
- 6V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 35V
- Current - Output:
- 600mA
- Frequency - Switching:
- 2.6MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DSBGA
LM34919BTLX/NOPB FAQ
1.How can I place an order for LM34919BTLX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM34919BTLX/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 LM34919BTLX/NOPB reliable?
The price and inventory of LM34919BTLX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM34919BTLX/NOPB is usually 5 days.
3.What payment methods are accepted for LM34919BTLX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM34919BTLX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM34919BTLX/NOPB?
LM34919BTLX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM34919BTLX/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 LM34919BTLX/NOPB?
For technical support, including LM34919BTLX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM34919BTLX/NOPB requirements.
6.How does Aetrix verify that LM34919BTLX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM34919BTLX/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 LM34919BTLX/NOPB meets industry standards.
7.What is the process for return or replacement of LM34919BTLX/NOPB?
All LM34919BTLX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM34919BTLX/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 LM34919BTLX/NOPB part is unused and in its original packaging.
Return procedure for LM34919BTLX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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