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Texas Instruments LM3673TLX-1.5/NOPB
- Part No.:
- LM3673TLX-1.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-WFBGA, DSBGA
- Datasheet:
-
LM3673TLX-1.5/NOPB.pdf
- Description:
- IC REG BUCK 1.5V 350MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,149
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Product details
Overview
LM3673TLX-1.5/NOPB from Texas Instruments is a fixed-output 1.5 V, 350-mA synchronous step-down DC-DC converter optimized for single Li-Ion battery-powered systems. It operates from 2.7 V to 5.5 V input, delivers 2 MHz (typical) fixed-frequency PWM switching with automatic PFM/PWM mode transition, and achieves 16 µA typical quiescent current in light-load operation - enabling extended battery life in portable electronics.
For engineers reviewing the LM3673TLX-1.5/NOPB datasheet, LM3673TLX-1.5/NOPB pinout, LM3673TLX-1.5/NOPB application, or LM3673TLX-1.5/NOPB equivalent, key selection criteria include its DSBGA-5 package footprint, internal 0.5 V reference, 750 mA typical peak current limit, shutdown current of 0.01 µA, and compatibility with only three external components: one 2.2 µH inductor and two ceramic capacitors (4.7 µF input / 10 µF output).
Technical Context
The LM3673TLX-1.5/NOPB implements voltage-mode control with input-voltage feed-forward for stable line regulation and uses internal synchronous PFET/NFET switches to eliminate external diode losses. Its functional architecture integrates soft-start ramp generation, thermal shutdown at 150°C (typical), undervoltage lockout, and cycle-by-cycle current limiting.
It supports three operational modes: fixed-frequency 2 MHz PWM above ~80 mA load, hysteretic PFM below that threshold for ultra-low IQ, and logic-controlled shutdown (<0.4 V on EN). The FB pin is internally connected to a precision 0.5 V reference and directly tied to the output for fixed versions - no external resistor divider required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5 V ±2.5% - eliminates need for external feedback resistors and simplifies layout. |
| Input Voltage Range | 2.7 V to 5.5 V - supports full discharge curve of single Li-Ion cell (3.0–4.2 V nominal) plus margin. |
| Max Load Current | 350 mA continuous - sufficient for core logic rails in mobile phones, MP3 players, and digital cameras. |
| Switching Frequency | 2 MHz typical - enables use of tiny 2.2 µH inductor and small 0402/0603 ceramic capacitors. |
| Quiescent Current | 16 µA typical in PFM mode - extends standby battery life without sacrificing transient response. |
| Shutdown Current | 0.01 µA typical - critical for zero-power system sleep states in portable instrumentation. |
| Peak Current Limit | 750 mA typical - provides robust short-circuit protection while allowing headroom for inrush during startup. |
Pinout & Package
LM3673TLX-1.5/NOPB is housed in a 1.413 mm × 1.083 mm, 5-pin DSBGA (YZR) package with bottom-side solder balls - designed for space-constrained portable PCBs and compatible with standard reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (A1) | Power Input | Connects to input filter capacitor (4.7 µF); must be ≥2.7 V for enable - powers internal bias circuitry. |
| GND (A3) | Ground Reference | Primary return path for input, output, and internal switch currents; requires low-impedance PCB plane connection. |
| SW (B2) | Switch Node | Drives external inductor; carries high di/dt PWM waveform - must be routed short and away from noise-sensitive traces. |
| EN (C1) | Enable Control | Logic-level input: <0.4 V = shutdown (0.01 µA IQ), >1 V = active; floating not allowed - requires pull-down if unused. |
| FB (C3) | Feedback Input | Internally referenced to 0.5 V; directly connected to VOUT for fixed 1.5 V operation - no external resistors needed. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Synchronous Rectification | Eliminates external Schottky diode - reduces conduction loss and improves efficiency at 1.5 V output, especially under medium loads. |
| Automatic PFM/PWM Mode Switching | Seamlessly transitions between 2 MHz PWM (high efficiency at >80 mA) and low-frequency PFM (16 µA IQ at light load) - no external control required. |
| Integrated Soft-Start | Ramps switch current limit in steps (70 → 140 → 280 → 750 mA) - prevents inrush into 10 µF output capacitor and avoids input rail droop. |
| Thermal & Overcurrent Protection | Shuts down at 150°C junction temperature and limits peak switch current to 750 mA - protects IC and external inductor during fault conditions. |
| Minimal External Components | Only three passive parts needed: 2.2 µH inductor + 4.7 µF CIN + 10 µF COUT - reduces BOM count, board area, and assembly cost. |
Applications
| Mobile Phone Core Rail | MP3 Player Audio Codec Supply |
|---|---|
Use Scenario: Powers baseband processor I/O or memory interface in slim smartphone designs with tight thermal and space constraints. IC Role / Device Role / Timing Role: Primary 1.5 V buck regulator delivering regulated power from shared Li-Ion battery rail. Use Value: 2 MHz switching allows compact 0603 inductor placement near processor; 16 µA PFM IQ extends standby time between charges. | Use Scenario: Supplies clean 1.5 V to stereo audio DAC and headphone amplifier in battery-operated MP3 players. IC Role / Device Role / Timing Role: Low-noise, high-efficiency point-of-load converter decoupled from noisy system rails. Use Value: Internal synchronous rectification minimizes dropout and heat rise at 150 mA load; soft-start prevents pop/click during power-on. |
| Digital Still Camera Image Sensor Bias | Portable Instrument LCD Controller Rail |
Use Scenario: Provides stable 1.5 V bias to CMOS image sensor analog front-end during burst capture sequences. IC Role / Device Role / Timing Role: Fast-transient capable buck converter supporting dynamic current demands up to 350 mA. Use Value: 750 mA peak current limit ensures reliable startup into 10 µF output cap; PFM-to-PWM transition at ~100 mA maintains regulation during frame readout. | Use Scenario: Powers segment driver ICs and timing controller in handheld test meters and medical monitors. IC Role / Device Role / Timing Role: Always-on supply rail with ultra-low shutdown current for rapid wake-from-sleep functionality. Use Value: 0.01 µA shutdown IQ preserves battery charge over weeks of storage; DSBGA-5 footprint fits narrow bezel PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | Fixed 1.5 V output, 300 mA max, 3 MHz switching, 17 µA IQ - smaller 1.0 mm × 1.0 mm DSBGA but lower current rating. | Suitable for lower-power microcontrollers or sensors where 350 mA headroom is unnecessary. | Select when board space is more constrained than current capability and 3 MHz allows even smaller passives. |
| AP63202WU-15 | Fixed 1.5 V, 2 A max, SOT-563 package, 25 µA IQ - higher current, larger footprint, no PFM mode (PWM-only). | Better for systems requiring future scalability or simultaneous multi-rail loads, but less efficient at light loads. | Choose when peak load exceeds 350 mA or when SOT-563 reflow compatibility is preferred over DSBGA. |
Compared with TPS62231DRYR, LM3673TLX-1.5/NOPB delivers 17% higher load capacity in the same footprint class; versus AP63202WU-15, it offers superior light-load efficiency via PFM mode but trades off maximum current and package compatibility.
Availability
LM3673TLX-1.5/NOPB is available at Aetrix Electronics and suitable for mobile phone power management, portable audio subsystems, digital camera imaging rails, and handheld instrument LCD controllers requiring stable component supply across production lifecycles.
Supply support for LM3673TLX-1.5/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 - serving automotive, industrial, personal electronics, and communications markets.
The LM3673 product line targets ultra-compact, battery-optimized DC-DC conversion for portable consumer devices - emphasizing minimal external components, nanoscale packaging, and intelligent power-state management.
FAQ
What is the recommended input capacitor for LM3673TLX-1.5/NOPB?
The LM3673TLX-1.5/NOPB datasheet specifies a 4.7 µF ceramic input capacitor placed close to the VIN and GND pins. This value ensures adequate high-frequency decoupling for the 2 MHz switching node and maintains stability under transient load changes. X5R or X7R dielectrics in 0402 or 0603 case sizes are recommended to minimize ESL and handle ripple current.
Does LM3673TLX-1.5/NOPB require an external feedback resistor network?
No, LM3673TLX-1.5/NOPB does not require external feedback resistors. As a fixed-output variant, its FB pin is internally connected to a precision 0.5 V reference and hardwired to regulate VOUT at 1.5 V. External resistors are only needed for the adjustable LM3673TLX-ADJ/NOPB version.
What is the thermal shutdown threshold for LM3673TLX-1.5/NOPB?
The LM3673TLX-1.5/NOPB activates thermal shutdown at a typical junction temperature of 150°C and resumes operation once the junction cools to approximately 130°C. This hysteresis prevents oscillation near the trip point and protects both the IC and surrounding PCB components during sustained overload or poor heatsinking conditions.
Can LM3673TLX-1.5/NOPB operate from a 2.5 V input source?
No, LM3673TLX-1.5/NOPB requires a minimum input voltage of 2.7 V per its recommended operating ratings. At 2.5 V, the device will not enable - the internal undervoltage lockout prevents operation to ensure stable regulation and avoid erratic behavior. System design must guarantee VIN ≥2.7 V before asserting EN high.
How does the soft-start function work in LM3673TLX-1.5/NOPB?
The LM3673TLX-1.5/NOPB implements soft-start by progressively increasing the internal peak switch current limit in four steps: 70 mA → 140 mA → 280 mA → 750 mA (typical). This staged ramp prevents inrush current into the 10 µF output capacitor, limits input voltage droop, and ensures controlled VOUT rise - with typical startup time of 240–280 µs depending on load.
LM3673TLX-1.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 350mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-DSBGA (1.41x1.08)
LM3673TLX-1.5/NOPB FAQ
1.How can I place an order for LM3673TLX-1.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3673TLX-1.5/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 LM3673TLX-1.5/NOPB reliable?
The price and inventory of LM3673TLX-1.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3673TLX-1.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM3673TLX-1.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3673TLX-1.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3673TLX-1.5/NOPB?
LM3673TLX-1.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3673TLX-1.5/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 LM3673TLX-1.5/NOPB?
For technical support, including LM3673TLX-1.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3673TLX-1.5/NOPB requirements.
6.How does Aetrix verify that LM3673TLX-1.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3673TLX-1.5/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 LM3673TLX-1.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM3673TLX-1.5/NOPB?
All LM3673TLX-1.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3673TLX-1.5/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 LM3673TLX-1.5/NOPB part is unused and in its original packaging.
Return procedure for LM3673TLX-1.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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