My Inquiry
My Account
Texas Instruments LM34919TLX/NOPB
- Part No.:
- LM34919TLX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WFBGA
- Datasheet:
-
LM34919TLX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 600MA 10DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:5,795
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM34919TLX/NOPB from Texas Instruments is a constant on-time, 8V–40V input, 600-mA synchronous buck switching regulator with integrated N-channel MOSFET, 2.5-V internal reference, and valley current limit at 0.64 A. It operates up to 2.0 MHz in a 10-pin DSBGA package and targets high-efficiency point-of-load regulation in industrial power supplies.
For engineers reviewing the LM34919TLX/NOPB datasheet, LM34919TLX/NOPB pinout, LM34919TLX/NOPB application, or LM34919TLX/NOPB equivalent, key selection considerations include its no-loop-compensation architecture, bootstrap-driven gate drive, RON-programmable on-time, thermal shutdown at 175°C, and softstart via external capacitor on SS pin.
Technical Context
The LM34919TLX/NOPB uses a constant on-time control scheme where tON is set by VIN and an external RON resistor - enabling frequency stability across line and load variations. Its valley current limit detects recirculating current at ISEN/SGND, triggering off-time extension without foldback.
Regulation relies on a 2.5-V internal reference compared against FB voltage; overvoltage protection activates at 2.9 V. Startup is managed by an integrated 7.0-V VCC regulator with UVLO (5.7 V), while BST pin drives the high-side switch via a 0.022-µF bootstrap capacitor charged during SW low periods.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8 V to 40 V - supports wide industrial input rails including 12 V, 24 V, and 36 V systems without pre-regulation. |
| Output Current Capability | 600 mA continuous - limited by valley current sense at 0.64 A, ensuring safe operation under short-circuit conditions. |
| Switching Frequency | Up to 2.0 MHz - programmable via RON resistor; enables compact magnetics and fast transient response. |
| Feedback Reference | 2.5 V ±1.2% - precise internal bandgap reference used directly at FB pin for output voltage setting. |
| On-Time Control | RON-programmable - external resistor from VIN to RON/SD sets tON; inverse VIN dependence maintains stable fSW. |
| Thermal Shutdown | 175°C activation with 20°C hysteresis - protects device during overload or poor PCB thermal design. |
| VCC Regulator | 7.0 V ±0.4 V, 9.5 mA current limit - powers internal circuitry; supports external bias up to 14 V to reduce dissipation. |
Pinout & Package
LM34919TLX/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. The bump-side layout follows TI's standard DSBGA pin mapping for thermal and electrical performance optimization.
| 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 for all internal circuitry except current sense path; connects to system ground plane. |
| A3: FB | Feedback input | Compares output voltage (via R1/R2 divider) to 2.5-V internal reference; requires ≥25 mVpp ripple for stable operation. |
| B1: SGND | Sense ground return | Carries recirculating current from ISEN through external 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, ramping output voltage linearly during startup. |
| C1: ISEN | Current sense output | Outputs recirculating current to external diode; internal comparator triggers valley current limit at 0.64 A. |
| C3: VCC | Startup regulator output | Supplies 7.0 V to internal logic; can be externally biased (7–14 V) to bypass internal regulator and reduce power loss. |
| D1: VIN | Main input supply | Accepts 8–40 V DC; absolute max rating is 44 V; connects to input bulk capacitor C1 and bootstrap supply path. |
| D2: SW | Switching node | Connects to inductor, freewheeling diode, and bootstrap capacitor; swings between VIN and ~−1 V during off-time. |
| D3: BST | Bootstrap capacitor connection | Connects 0.022 µF ceramic capacitor to SW; supplies gate drive voltage for high-side N-MOSFET during on-time. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Constant on-time architecture eliminates need for external compensation network - reduces BOM count and design iteration time. |
| Ultra-fast transient response | On-time retriggering on every FB dip enables sub-microsecond recovery from load steps - critical for POL applications with dynamic loads. |
| Integrated start-up regulator | Self-biased 7.0-V VCC rail allows direct connection to 8–40 V input - removes need for auxiliary bias supply or LDO pre-regulator. |
| Valley current limiting | 0.64-A threshold detected during off-time ensures smooth transition to constant-current mode - avoids destructive peak-current runaway during shorts. |
| Thermal shutdown with hysteresis | 175°C trip with 20°C hysteresis prevents thermal cycling - enables safe recovery after fault clearance without manual reset. |
Applications
| Industrial PLC Power Rails | Telecom Point-of-Load Regulation |
|---|---|
Use Scenario: Providing stable 5-V or 3.3-V bias to microcontrollers, I/O drivers, and communication interfaces inside programmable logic controllers operating from 24-V DC bus. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering up to 600 mA with minimal external components and no compensation. Use Value: Enables compact, thermally efficient 1.5 mm × 1.5 mm footprint on dense control modules while maintaining >90% efficiency across 200–600 mA load range. | Use Scenario: Generating 3.3-V supply for Ethernet PHYs, SFP+ transceivers, or baseband processors in telecom equipment powered from 48-V intermediate bus. IC Role / Device Role / Timing Role: High-voltage step-down converter supporting 8–40 V input range and fast load transients typical of packetized data traffic. Use Value: Delivers 2-MHz switching capability to shrink filter size and meet strict EMI limits in dense telecom card layouts. |
| Automotive Body Control Modules | Secondary Post-Regulator in HV Systems |
Use Scenario: Supplying regulated 5-V power to CAN transceivers, sensor signal conditioners, and LED drivers in 12-V automotive body electronics with load dump tolerance. IC Role / Device Role / Timing Role: Input-capable buck regulator handling up to 44-V transient surges while maintaining regulation during cold-crank (6.5-V minimum). Use Value: Eliminates need for upstream TVS or pre-regulator stages due to 40-V operating and 44-V absolute max rating. | Use Scenario: Down-converting 24–40 V from primary isolated DC-DC stage to 1.2-V or 1.8-V core voltage for FPGAs or DSPs in industrial motor drives. IC Role / Device Role / Timing Role: Secondary non-isolated buck stage with precision 2.5-V reference and low-noise feedback path for tight output tolerance. Use Value: Achieves ±1% output accuracy over temperature using standard 1% resistors in R1/R2 divider, reducing calibration overhead. |
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, 1.5-A output, current-mode control requiring compensation; larger HTSSOP-16 package. | Supports higher current and automotive AEC-Q100 Grade 1 qualification; suited for harsher environments with extended temp range. | Select when >600 mA output or AEC-Q100 compliance is mandatory; not drop-in due to different control architecture and pinout. |
| TPS54202DDCR | Lower 4.5–28 V input, 2-A output, integrated compensation; 6-pin SOT-23 package with different pin assignment. | Optimized for cost-sensitive, lower-input-voltage applications; lacks valley current limit and bootstrap driver. | Choose for 12-V systems needing higher current and smaller solution size; incompatible with 36–40 V inputs or bootstrap-based high-side drive. |
Compared with LM5164QPWPRQ1 and TPS54202DDCR, the LM34919TLX/NOPB offers unique value in ultra-compact 10-pin DSBGA form factor, no-loop-compensation simplicity, and native support for 40-V industrial inputs - making it optimal for space-constrained, medium-current POL designs where design cycle time and component count matter most.
Availability
LM34919TLX/NOPB is available at Aetrix Electronics and suitable for industrial PLC power rails, telecom point-of-load regulation, automotive body control modules, and secondary post-regulators requiring stable component supply and long-term manufacturability.
Supply support for LM34919TLX/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 power conversion solutions.
The LM34919TLX/NOPB belongs to TI's high-voltage buck regulator product line, designed specifically for efficient, compact, and easy-to-implement point-of-load conversion in industrial, telecom, and automotive applications.
FAQ
What is the maximum input voltage rating for LM34919TLX/NOPB?
The LM34919TLX/NOPB has an absolute maximum input voltage (VIN to RTN) rating of 44 V, with recommended operating range of 8 V to 40 V. Exceeding 44 V risks permanent damage. The device includes internal protection features such as VCC under-voltage lockout and thermal shutdown, but sustained operation above 40 V is outside specification and not supported in production use.
How does the RON resistor affect LM34919TLX/NOPB operation?
The RON resistor connected between VIN and the RON/SD pin sets the on-time duration, which determines switching frequency in conjunction with input voltage. For example, a 43.2-kΩ resistor yields ~806 kHz at 8 V input and ~260 kHz at 40 V input due to the inverse VIN relationship. RON also serves as shutdown enable - grounding this pin disables the regulator and discharges the SS capacitor.
Can LM34919TLX/NOPB operate without an external bootstrap capacitor?
No - the LM34919TLX/NOPB requires a 0.022-µF ceramic capacitor between BST and SW pins to sustain gate drive for the integrated N-channel buck switch. Without it, the high-side driver cannot maintain sufficient gate voltage during on-time, causing immediate failure to regulate. TI specifies X7R or better dielectric with low ESR, placed adjacent to the BST and SW pads per layout guidelines.
What is the purpose of the ISEN and SGND pins on LM34919TLX/NOPB?
The ISEN pin outputs the recirculating inductor current during the off-time, while SGND provides the dedicated return path for that current through the internal sense resistor. This pair enables valley current limiting at 0.64 A. Routing SGND separately from RTN minimizes noise coupling into the current-sense path, preserving limit accuracy and preventing false trips during high-dI/dt transitions.
Does LM34919TLX/NOPB require output voltage ripple at the FB pin?
Yes - the LM34919TLX/NOPB requires a minimum 25-mVPP ripple at the FB pin for stable constant-on-time regulation. This ripple is typically generated by inductor current flowing through an external R3 resistor in series with the feedback divider. If output capacitor ESR is too low, adding R3 or using AC-coupled feedforward (Cff) is necessary to meet this requirement and prevent erratic switching behavior.
LM34919TLX/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
LM34919TLX/NOPB FAQ
1.How can I place an order for LM34919TLX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM34919TLX/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 LM34919TLX/NOPB reliable?
The price and inventory of LM34919TLX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM34919TLX/NOPB is usually 5 days.
3.What payment methods are accepted for LM34919TLX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM34919TLX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM34919TLX/NOPB?
LM34919TLX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM34919TLX/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 LM34919TLX/NOPB?
For technical support, including LM34919TLX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM34919TLX/NOPB requirements.
6.How does Aetrix verify that LM34919TLX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM34919TLX/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 LM34919TLX/NOPB meets industry standards.
7.What is the process for return or replacement of LM34919TLX/NOPB?
All LM34919TLX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM34919TLX/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 LM34919TLX/NOPB part is unused and in its original packaging.
Return procedure for LM34919TLX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM34919TLX/NOPB Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
