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Texas Instruments LM34919BQTLX/NOPB
- Part No.:
- LM34919BQTLX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WFBGA
- Datasheet:
-
LM34919BQTLX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 600MA 10DSBGA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM34919BQTLX/NOPB from Texas Instruments is a constant on-time synchronous buck switching regulator IC with integrated 0.5 Ω N-channel MOSFET switch, operating from 6 V to 40 V input and delivering up to 600 mA output current at adjustable voltage (2.5 V reference), optimized for automotive infotainment and high-efficiency point-of-load regulation in space-constrained systems.
For engineers reviewing the LM34919BQTLX/NOPB datasheet, LM34919BQTLX/NOPB pinout, LM34919BQTLX/NOPB application, or LM34919BQTLX/NOPB equivalent, key selection considerations include its 2.6 MHz max switching frequency, valley current limit at 0.64 A, 10-pin DSBGA package, no-loop-compensation architecture, and AEC-Q100 Grade 1 qualification for −40°C to +125°C operation.
Technical Context
The LM34919BQTLX/NOPB implements a constant on-time control scheme where tON is programmable via external RON and inversely scales with VIN, enabling stable ~1.5–2.6 MHz operation across line and load variations. Its feedback 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; thermal shutdown activates at 175°C with 20°C hysteresis; startup regulation delivers 7.0 V at VCC with 15 mA current limit and 5.25 V UVLO threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 40 V - supports direct connection to automotive battery rails including cold-crank and load-dump transients up to 44 V. |
| Output Current | 600 mA - maximum continuous load current with integrated 0.5 Ω N-channel buck switch and valley current limiting. |
| Switching Frequency | Up to 2.6 MHz - enables use of small external inductors (e.g., 6.8 µH) and ceramic capacitors for compact POL designs. |
| Feedback Reference | 2.5 V ±1.2% - precision internal reference sets output voltage via resistor divider (VOUT = 2.5 × (R1+R2)/R2). |
| Current Limit Threshold | 0.64 A - valley current limit at ISEN pin ensures smooth transition to constant-current mode during overload or short-circuit. |
| Operating Junction Temp | −40°C to +125°C - AEC-Q100 Grade 1 qualified for under-hood and infotainment module deployment. |
| Package | 10-pin DSBGA (2.0 mm × 1.6 mm, 0.4 mm pitch) - ultra-small footprint suitable for dense automotive PCB layouts. |
Pinout & Package
LM34919BQTLX/NOPB uses a 10-pin Wafer Chip-Scale Package (DSBGA) with bottom-side solder bumps. Pin mapping follows TI's standard bump layout (A1–D3 grid) and requires controlled-depth reflow for reliable interconnect.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 RON/SD | On-time programming & shutdown control | Resistor from VIN sets tON; grounding disables regulator and discharges SS capacitor. |
| A2 RTN | Main circuit ground | Reference node for internal bias circuits and regulation comparators - separate from sense ground. |
| A3 FB | Feedback input | Connects to resistor divider output; regulated at 2.5 V; requires ≥25 mVpp ripple for stable operation. |
| B1 SGND | Sense ground return | Carries recirculating inductor current through internal sense resistor - must be routed separately from RTN. |
| B3 SS | Soft-start timing node | Internal 10.5 µA current source charges external capacitor to 2.5 V for controlled output ramp-up. |
| C1 ISEN | Current sense output | Outputs recirculating current to external Schottky diode; 0.64 A limit triggers off-time extension. |
| C3 VCC | Startup regulator output | Internally regulated 7.0 V supply; can accept external 7–14 V to reduce dissipation; UVLO at 5.25 V. |
| D1 VIN | Main input supply | Accepts 6–40 V; absolute max 44 V; powers startup regulator and gate driver via internal diode to VCC. |
| D2 SW | Switching node | Connects to inductor, bootstrap capacitor (C4), and Schottky diode anode - high dv/dt node requiring tight layout. |
| D3 BST | Bootstrap capacitor connection | Connects 0.022 µF ceramic capacitor to SW; supplies floating gate drive voltage for N-channel MOSFET. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Constant on-time architecture eliminates external compensation network - reduces BOM count and design iteration time. |
| Ultra-fast transient response | Load step recovery within microseconds due to feed-forward-like on-time adjustment and absence of phase-margin constraints. |
| Integrated startup regulator | Self-biased 7.0 V VCC rail enables direct 6–40 V input connection without external bias supply or LDO. |
| Valley current limit protection | 0.64 A threshold with 50 ns response avoids foldback behavior - maintains regulation during moderate overloads. |
| Thermal shutdown with hysteresis | 175°C trip point and 20°C hysteresis prevents thermal cycling and enables safe recovery after overheating events. |
Applications
| Automotive Infotainment Power Supply | Industrial Point-of-Load Regulator |
|---|---|
Use Scenario: Powers DSP, display controller, and audio codec in head-unit modules with 12 V battery input and strict EMI limits. IC Role / Device Role / Timing Role: Primary buck regulator providing 3.3 V/5 V at ≤600 mA with 2.6 MHz switching to minimize conducted noise in sensitive RF bands. Use Value: AEC-Q100 Grade 1 rating ensures reliability at 125°C junction temperature; DSBGA package saves >40% board area vs. SOIC alternatives. | Use Scenario: Supplies FPGA I/O banks or microcontroller peripherals in factory automation controllers with wide-input industrial power rails. IC Role / Device Role / Timing Role: High-voltage buck converter stepping 24 V industrial bus down to 1.8 V or 3.3 V with fast load transient handling. Use Value: Constant on-time control maintains stable frequency across 6–40 V input range; no compensation simplifies layout for ruggedized PCBs. |
| Secondary High-Voltage Post Regulator | Telecom DC-DC Bias Supply |
Use Scenario: Generates isolated 5 V bias for gate drivers or optocouplers downstream of a primary 48 V–12 V intermediate bus. IC Role / Device Role / Timing Role: Non-isolated secondary regulator accepting 12–40 V input from upstream converter to deliver clean, low-noise 5 V. Use Value: 2.6 MHz operation allows <10 µH inductors and 10 µF ceramic output caps - eliminates electrolytics and improves MTBF. | Use Scenario: Provides 3.3 V standby power for management ASICs and PHY interfaces in telecom line cards with 48 V backplane input. IC Role / Device Role / Timing Role: Compact, high-efficiency buck regulator supporting hot-swap and inrush current limiting via soft-start and current limit. Use Value: RON/SD pin enables system-level enable/disable sequencing; 0.64 A current limit protects against cable fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM34919BQDRGRQ1 | AEC-Q100 Grade 1 variant in 10-pin WSON package; identical electrical specs but different thermal resistance (θJA = 52°C/W vs. 61°C/W) and pinout. | Preferred for thermally constrained WSON-optimized layouts; not pin-compatible with DSBGA LM34919BQTLX/NOPB. | Select when board space permits larger WSON footprint and thermal performance is prioritized over minimal area. |
| TPS54202HDDCR | 4.5–28 V input, 2 A output, 2.5 V reference, 2.5 MHz max frequency; uses current-mode control with external compensation. | Higher current capability but narrower input range; requires compensation network and lacks AEC-Q100 qualification. | Choose for non-automotive 2 A POL needs where input stays below 28 V and loop tuning is acceptable. |
Compared with LM34919BQTLX/NOPB, LM34919BQDRGRQ1 offers identical functionality in a thermally superior WSON package but requires PCB redesign, while TPS54202HDDCR provides higher output current and faster frequency but sacrifices automotive qualification and adds compensation complexity.
Availability
LM34919BQTLX/NOPB is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial point-of-load regulators, secondary high-voltage post regulators, and telecom DC-DC bias supplies requiring stable component supply with AEC-Q100 compliance and ultra-compact packaging.
Supply support for LM34919BQTLX/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, embedded processing, and logic ICs for industrial, automotive, and consumer markets.
The LM34919B product line delivers high-voltage, constant-on-time buck regulators targeting space-constrained automotive and industrial power conversion where fast transient response, no-loop-compensation simplicity, and AEC-Q100 reliability are critical.
FAQ
What is the maximum input voltage rating for LM34919BQTLX/NOPB?
The LM34919BQTLX/NOPB has an absolute maximum input voltage (VIN to RTN) of 44 V, with recommended operating range of 6 V to 40 V. This rating supports automotive battery systems including cold-crank (down to 6 V) and load-dump transients (up to 44 V), making LM34919BQTLX/NOPB suitable for under-hood and infotainment applications requiring robust input tolerance.
Does LM34919BQTLX/NOPB require external compensation components?
No, LM34919BQTLX/NOPB does not require external compensation components. Its constant on-time control architecture eliminates the need for loop compensation networks, simplifying design, reducing BOM count, and improving stability across line and load variations. The LM34919BQTLX/NOPB achieves fast transient response inherently through feed-forward-like on-time adjustment based on VIN and RON.
What is the purpose of the ISEN pin on LM34919BQTLX/NOPB?
On LM34919BQTLX/NOPB, the ISEN pin outputs the recirculating inductor current during the off-time for valley current limit detection. It sources current into the external Schottky diode and connects internally to a 135 mΩ sense resistor. When current exceeds 0.64 A, the LM34919BQTLX/NOPB extends off-time to maintain constant current mode - protecting against overload without foldback behavior.
Can LM34919BQTLX/NOPB operate with an externally supplied VCC voltage?
Yes, LM34919BQTLX/NOPB supports external VCC biasing between 7 V and 14 V applied to the VCC pin via a diode. Doing so disables the internal startup regulator, reducing power dissipation and improving efficiency at high VIN. The sum of external VCC and VIN must not exceed 52 V, and the internal diode from VIN to VCC remains active - ensuring seamless handover if external supply fails.
What is the soft-start mechanism used in LM34919BQTLX/NOPB?
LM34919BQTLX/NOPB implements soft-start via an internal 10.5 µA current source that charges an external capacitor connected to the SS pin to 2.5 V. As the SS voltage ramps, it raises the non-inverting input of the regulation comparator, gradually increasing output voltage. An internal switch grounds SS during shutdown or VCC UVLO, ensuring controlled restart - preventing inrush current and stress on downstream components in the LM34919BQTLX/NOPB application.
LM34919BQTLX/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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DSBGA
LM34919BQTLX/NOPB FAQ
1.How can I place an order for LM34919BQTLX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM34919BQTLX/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 LM34919BQTLX/NOPB reliable?
The price and inventory of LM34919BQTLX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM34919BQTLX/NOPB is usually 5 days.
3.What payment methods are accepted for LM34919BQTLX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM34919BQTLX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM34919BQTLX/NOPB?
LM34919BQTLX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM34919BQTLX/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 LM34919BQTLX/NOPB?
For technical support, including LM34919BQTLX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM34919BQTLX/NOPB requirements.
6.How does Aetrix verify that LM34919BQTLX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM34919BQTLX/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 LM34919BQTLX/NOPB meets industry standards.
7.What is the process for return or replacement of LM34919BQTLX/NOPB?
All LM34919BQTLX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM34919BQTLX/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 LM34919BQTLX/NOPB part is unused and in its original packaging.
Return procedure for LM34919BQTLX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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