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Texas Instruments LM3673TLX-1.8/NOPB
- Part No.:
- LM3673TLX-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-WFBGA, DSBGA
- Datasheet:
-
LM3673TLX-1.8/NOPB.pdf
- Description:
- IC REG BUCK 1.8V 350MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM3673TLX-1.8/NOPB from Texas Instruments is a 2-MHz, 350-mA synchronous step-down DC-DC converter in a 5-pin DSBGA package, delivering a fixed 1.8-V output from 2.7–5.5-V input. It features automatic PFM/PWM mode switching, 16-µA typical quiescent current, internal soft start, and thermal/overcurrent protection-designed for Li-Ion–powered portable electronics requiring compact, high-efficiency power conversion.
For engineers reviewing the LM3673TLX-1.8/NOPB datasheet, LM3673TLX-1.8/NOPB pinout, LM3673TLX-1.8/NOPB application, or LM3673TLX-1.8/NOPB equivalent, key selection considerations include its fixed 1.8-V output, 2-MHz switching frequency enabling ultra-small external components (2.2-µH inductor, 4.7-µF/10-µF ceramics), and low-noise PFM operation at light loads.
Technical Context
The LM3673TLX-1.8/NOPB employs voltage-mode PWM control with input-voltage feed-forward for stable line regulation, and automatically transitions to hysteretic PFM mode below ~50–100 mA load to reduce quiescent current to 16 µA. Its internal synchronous rectification uses a PFET switch (450 mΩ typical RDS(ON)) and NFET rectifier (250 mΩ typical) to eliminate external diode losses.
It integrates a 0.5-V internal reference, undervoltage lockout, and current-limit protection (750 mA typical peak limit). The device operates across –30°C to +85°C ambient, with shutdown current of 0.01 µA and soft-start ramping switch current limit in steps (70/140/280/750 mA) for controlled inrush.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±2.5% - eliminates need for external feedback resistors and simplifies layout. |
| Input Voltage Range | 2.7 V to 5.5 V - supports single-cell Li-Ion (fully charged to depleted) and common system rails. |
| Max Load Current | 350 mA - sufficient for core logic, RF transceivers, and memory subsystems in portable devices. |
| Switching Frequency | 2 MHz typical - enables use of tiny 2.2-µH inductors and low-ESR ceramic capacitors (CIN=4.7 µF, COUT=10 µF). |
| Quiescent Current | 16 µA typical in PFM mode - extends battery life during standby or low-activity states. |
| Shutdown Current | 0.01 µA typical - minimizes leakage during system sleep or power-off states. |
| Feedback Reference | 0.5 V internal - sets regulated output as VOUT = 1.8 V = 0.5 V × (1 + R1/R2); fixed version internally configures divider. |
Pinout & Package
LM3673TLX-1.8/NOPB is housed in a 1.413 mm × 1.083 mm, 5-pin DSBGA (YZR) package optimized for space-constrained portable PCBs. Thermal resistance is RθJA = 181.0°C/W, with dedicated ground and power pads for efficient heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (A1) | Power Input | Connects to input filter capacitor (4.7 µF); accepts 2.7–5.5 V; powers internal circuitry and PFET gate driver. |
| GND (A3) | Ground Reference | Primary return path for input/output currents and internal bias; must be low-impedance connection to PCB ground plane. |
| SW (B2) | Switch Node | Drives external inductor (2.2 µH); connects internally to PFET drain and NFET source; requires tight layout to minimize EMI. |
| EN (C1) | Enable Control | Active-high logic input; device enabled when >1 V, shutdown when <0.4 V; 0.01 µA input current allows direct MCU GPIO drive. |
| FB (C3) | Feedback Sense | Internally connected to fixed 1.8-V divider; not user-accessible in TLX-1.8 variant-output regulation occurs without external resistors. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic PFM/PWM Mode Switching | Transitions seamlessly at ~50–100 mA load to maintain >85% efficiency from 1 mA to 350 mA without manual control. |
| Internal Synchronous Rectification | Eliminates external Schottky diode; reduces conduction loss by replacing ~0.3-V drop with 250-mΩ NFET RDS(ON). |
| Integrated Soft Start | Ramps switch current limit in four steps (70→140→280→750 mA) to limit inrush; typical startup time is 240–280 µs. |
| Thermal & Overcurrent Protection | Shuts down at TJ ≈ 150°C and limits peak switch current to 750 mA typical-prevents damage during short-circuit or overload. |
| Ultra-Small BOM | Requires only three passive components: 2.2-µH inductor, 4.7-µF input cap, 10-µF output cap-reduces board area and cost. |
Applications
| Mobile Phone Core Power | Wi-Fi/Bluetooth SoC Supply |
|---|---|
Use Scenario: Powers application processor I/O and memory interface rails in slim smartphone designs where battery runtime and board area are critical. IC Role / Device Role / Timing Role: Primary 1.8-V buck regulator delivering up to 350 mA with fast transient response and low ripple (<25 mV in LDO-like mode). Use Value: Enables continuous operation from 2.7-V depleted Li-Ion cell while maintaining regulation margin and minimizing thermal stress on DSBGA package. |
Use Scenario: Supplies 1.8-V rail to WLAN/BT combo chips during burst transmission and deep-sleep cycles in handheld IoT devices. IC Role / Device Role / Timing Role: Efficient point-of-load converter that switches between 2-MHz PWM (high throughput) and 16-µA PFM (standby) autonomously. Use Value: Extends battery life by >30% versus non-PFM alternatives during idle periods, with no firmware intervention required. |
| Digital Camera Image Sensor Bias | Portable HDD Controller Rail |
Use Scenario: Provides clean, low-noise 1.8-V supply to CMOS image sensor digital interfaces and ADC front-ends in compact digital still cameras. IC Role / Device Role / Timing Role: Low-ripple DC-DC source with <1% load regulation and 0.0015%/mA line sensitivity-minimizes clock jitter and quantization error. Use Value: Maintains signal integrity during rapid sensor readout bursts without requiring additional LDO post-regulation. |
Use Scenario: Powers flash memory controller and SATA bridge ICs in portable hard disk drives operating from USB-powered or battery sources. IC Role / Device Role / Timing Role: High-current (350 mA), thermally robust buck stage with integrated thermal shutdown-survives enclosure temperature spikes. Use Value: Eliminates need for discrete thermal monitoring circuitry while ensuring reliable operation up to 85°C ambient. |
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 1.8-V output, 3-MHz switching, 300-mA max load, 19-µA quiescent current, same 5-pin DSBGA (1.3×1.3 mm). | Slightly lower current capability and higher IQ; optimized for even smaller inductors (1.5 µH) but less margin under peak load. | Preferred when board space is tighter and peak load stays ≤300 mA; verify thermal performance at 85°C ambient. |
| AP63202WU-18 | Fixed 1.8-V output, 2-MHz switching, 2-A max load, 25-µA IQ, 8-pin WLCSP (1.5×1.5 mm), includes spread-spectrum modulation. | Higher current and larger package; adds EMI reduction via frequency dithering-unsuitable for strict size-constrained layouts. | Select when future-proofing for higher loads or stringent EMC requirements; requires PCB redesign due to different pinout and footprint. |
Compared with LM3673TLX-1.8/NOPB, TPS62231DRYR offers higher frequency but lower current headroom, while AP63202WU-18 provides scalability and EMI control at the cost of size and complexity-making LM3673TLX-1.8/NOPB optimal for cost-sensitive, space-limited 350-mA portable applications.
Availability
LM3673TLX-1.8/NOPB is available at Aetrix Electronics and suitable for mobile phones, Wi-Fi modules, digital cameras, and portable storage systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM3673TLX-1.8/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-efficiency DC-DC conversion for portable and industrial applications.
The LM3673 product line delivers compact, low-quiescent-current buck converters optimized for single-cell Li-Ion battery systems in space- and power-constrained portable electronics.
FAQ
What is the recommended input capacitor for LM3673TLX-1.8/NOPB?
The LM3673TLX-1.8/NOPB datasheet specifies a 4.7-µF ceramic input capacitor placed close to the VIN and GND pins. This value ensures stable operation across the 2.7–5.5-V input range and suppresses high-frequency switching noise. X5R or X7R dielectrics with 6.3-V or higher rating are recommended to maintain capacitance under DC bias.
Does LM3673TLX-1.8/NOPB require external feedback resistors?
No. The LM3673TLX-1.8/NOPB is a fixed-output variant with internal resistor divider set to 1.8 V. The FB pin is not user-accessible for configuration-unlike the ADJ version-and must be left unconnected or tied directly to the output node per layout guidelines. No external resistors are needed.
Can LM3673TLX-1.8/NOPB operate from a fully depleted Li-Ion cell?
Yes. The LM3673TLX-1.8/NOPB supports input voltages as low as 2.7 V, matching the minimum discharge voltage of standard Li-Ion cells. Its 100% duty-cycle capability in dropout conditions maintains regulation down to VIN = VOUT + ILOAD × (RDS(ON) + RINDUCTOR), enabling full utilization of battery capacity.
What thermal derating applies to LM3673TLX-1.8/NOPB at 85°C ambient?
At 85°C ambient, the LM3673TLX-1.8/NOPB's maximum continuous output current is reduced due to its RθJA of 181.0°C/W. With a 125°C junction limit, allowable power dissipation drops to ~220 mW, supporting ~300 mA at 1.8 V output under typical PCB copper area. Layout with thermal vias under the DSBGA pad is strongly advised.
How does the enable (EN) pin behave during power-up sequencing?
The EN pin of LM3673TLX-1.8/NOPB has TTL-compatible thresholds: device enables when EN > 1 V and shuts down when EN < 0.4 V. To prevent erratic startup, TI recommends holding EN low until VIN reaches ≥2.7 V, then asserting EN high-ensuring soft-start initiates only after valid input is present.
LM3673TLX-1.8/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 1.8V
- 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-1.8/NOPB FAQ
1.How can I place an order for LM3673TLX-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3673TLX-1.8/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-1.8/NOPB reliable?
The price and inventory of LM3673TLX-1.8/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-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM3673TLX-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3673TLX-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3673TLX-1.8/NOPB?
LM3673TLX-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3673TLX-1.8/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-1.8/NOPB?
For technical support, including LM3673TLX-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3673TLX-1.8/NOPB requirements.
6.How does Aetrix verify that LM3673TLX-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3673TLX-1.8/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-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM3673TLX-1.8/NOPB?
All LM3673TLX-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3673TLX-1.8/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-1.8/NOPB part is unused and in its original packaging.
Return procedure for LM3673TLX-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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