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Texas Instruments LM3673TL-1.2/NOPB
- Part No.:
- LM3673TL-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-WFBGA, DSBGA
- Datasheet:
-
LM3673TL-1.2/NOPB.pdf
- Description:
- IC REG BUCK 1.2V 350MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:715
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Product details
Overview
LM3673TL-1.2/NOPB from Texas Instruments is a fixed-output 1.2 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 fixed-frequency PWM switching (typical), achieves 16 µA quiescent current in PFM mode, and integrates internal PFET/NFET switches with soft-start and thermal shutdown-used in mobile phone core logic rails.
For engineers reviewing the LM3673TL-1.2/NOPB datasheet, LM3673TL-1.2/NOPB pinout, LM3673TL-1.2/NOPB application, or LM3673TL-1.2/NOPB equivalent, key selection criteria include output voltage accuracy (±2.5% over line/load/temperature), shutdown current (0.01 µA typical), DSBGA-5 package footprint (1.413 mm × 1.083 mm), and compatibility with 2.2 µH inductor + 10 µF ceramic output capacitor.
Technical Context
The LM3673TL-1.2/NOPB implements voltage-mode PWM control with input feed-forward for stable line regulation and automatic transition to hysteretic PFM mode below ~50 mA load to maintain high light-load efficiency. Its internal 0.5 V reference and fixed 1.2 V output eliminate external feedback resistors.
It uses synchronous rectification with 350 mΩ PFET and 150 mΩ NFET (at VIN = 3.6 V, TA = 25°C) to minimize conduction loss, supports 100% duty-cycle LDO-like operation near dropout, and incorporates cycle-by-cycle current limiting (750 mA typical) plus thermal shutdown at 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V ±2.5% over line, load, and temperature - ensures stable core supply for low-voltage processors. |
| Max Output Current | 350 mA continuous - sufficient for baseband processors or memory subsystems in portable devices. |
| Input Voltage Range | 2.7 V to 5.5 V - compatible with single Li-Ion (2.7–4.2 V) and regulated 3.3 V/5 V rails. |
| Switching Frequency | 2 MHz typical - enables use of tiny 2.2 µH inductor and reduces EMI filtering burden. |
| Quiescent Current | 16 µA typical in PFM mode - extends battery life during standby or light-load operation. |
| Shutdown Current | 0.01 µA typical - minimizes system leakage when disabled via EN pin. |
| Feedback Reference | Internal 0.5 V - eliminates external resistor divider, simplifies layout, improves accuracy vs. external networks. |
Pinout & Package
LM3673TL-1.2/NOPB is housed in a 5-pin DSBGA package (1.413 mm × 1.083 mm, 0.5 mm pitch) with bottom-side solder balls. The package supports high-density portable PCB layouts and requires controlled reflow per TI SMT guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (A1) | Power Input | Connects to input filter capacitor (≥4.7 µF ceramic); supplies internal bias and switch driver circuits. |
| GND (A3) | Ground Reference | Primary return path for power and feedback; must be low-impedance connection to PCB ground plane. |
| SW (B2) | Switch Node | Drives external inductor; connects internally to PFET drain and NFET source - requires tight layout to minimize ringing. |
| EN (C1) | Enable Control | Logic-level input: <0.4 V disables (0.01 µA IQ), >1 V enables; must not float - tie to VIN or microcontroller GPIO. |
| FB (C3) | Feedback Input | Internally connected to 1.2 V output divider; no external components required for fixed-version operation. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic PFM/PWM Mode Switching | Transitions at ~50 mA (VIN=3.6 V) to sustain >85% efficiency from 1 mA to full load without manual control. |
| Internal Synchronous Rectification | Eliminates external Schottky diode; 150 mΩ NFET RDS(on) reduces conduction loss and improves thermal performance. |
| Integrated Soft-Start | Ramps switch current limit in 4 steps (70/140/280/750 mA) to limit inrush; typical 240–280 µs startup with 10 µF COUT. |
| Thermal & Overcurrent Protection | Shuts down at 150°C junction temp and limits peak switch current to 750 mA typical - prevents damage under fault conditions. |
| Ultra-Low Shutdown Current | 0.01 µA typical enables long-term storage or deep-sleep states without battery drain. |
Applications
| Mobile Phone Core Rail | W-LAN Baseband Power |
|---|---|
Use Scenario: Powers ARM-based application processor core (e.g., Cortex-A series) requiring tightly regulated 1.2 V at up to 300 mA. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable core voltage; operates in PWM mode during active use and PFM during idle. Use Value: 2 MHz switching allows compact 2.2 µH inductor and avoids AM radio band interference; 16 µA PFM IQ extends standby time. | Use Scenario: Supplies 1.2 V to IEEE 802.11a/b/g/n WLAN chipset RF/baseband section in smartphones or tablets. IC Role / Device Role / Timing Role: Point-of-load regulator with fast transient response; handles burst-mode current demands during packet transmission. Use Value: Internal current limiting (750 mA) and thermal shutdown protect against antenna mismatch or short-circuit faults on RF front-end. |
| Digital Still Camera Sensor Bias | Portable HDD Controller Supply |
Use Scenario: Provides clean 1.2 V bias to CMOS image sensor digital backend (ADC, ISP) in compact digital cameras. IC Role / Device Role / Timing Role: Low-noise, low-ripple power source; FB pin directly tied to output for highest accuracy. Use Value: Fixed 1.2 V output eliminates resistor tolerance error; DSBGA-5 footprint saves space in ultra-thin camera modules. | Use Scenario: Powers 1.2 V controller IC in 2.5-inch portable hard disk drives where input derives from USB 5 V or Li-Ion pack. IC Role / Device Role / Timing Role: High-efficiency step-down converter supporting variable load (50–350 mA) during spin-up and data transfer. Use Value: 350 mA capability meets HDD controller peak demand; 2.7–5.5 V input range accommodates USB voltage drop and battery discharge. |
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 1.2 V output, 300 mA max, 3 MHz switching, 19 µA IQ - smaller current rating and higher frequency. | Optimized for ultra-compact space-constrained designs; less suitable for 350 mA sustained loads. | Select when board area is critical and peak load ≤300 mA; verify thermal margin at full load. |
| AP63202WS-7 | Fixed 1.2 V, 2 A max, 2.2 MHz, 25 µA IQ - higher current, larger package (SOT-563), no integrated soft-start. | Targets higher-power peripherals; requires external soft-start circuit if inrush control is needed. | Choose for future-proofing or multi-rail systems needing headroom; accept larger footprint and added BOM complexity. |
Compared with TPS62231DRYR and AP63202WS-7, the LM3673TL-1.2/NOPB delivers optimal balance of 350 mA capability, ultra-low 16 µA PFM IQ, and minimal 5-pin DSBGA footprint - making it ideal for cost- and size-sensitive portable applications where 300–350 mA load is typical.
Availability
LM3673TL-1.2/NOPB is available at Aetrix Electronics and suitable for mobile phones, W-LAN modules, digital still cameras, and portable hard disk drives requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for LM3673TL-1.2/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 DC-DC converter innovation.
The LM3673 product line was designed specifically for ultra-low-power, space-constrained portable electronics - delivering high efficiency across light-to-heavy loads using adaptive PFM/PWM control and synchronous rectification in miniature packages.
FAQ
What is the recommended input capacitor for LM3673TL-1.2/NOPB?
The LM3673TL-1.2/NOPB datasheet specifies a minimum 4.7 µF ceramic input capacitor placed close to the VIN and GND pins. A X5R or X7R dielectric with 6.3 V or higher rating is recommended to ensure stable operation across temperature and DC bias. Larger values (e.g., 10 µF) improve input ripple suppression under dynamic load conditions.
Does LM3673TL-1.2/NOPB require an external feedback resistor network?
No. The LM3673TL-1.2/NOPB is a fixed-output variant with internal resistor divider set to 1.2 V. The FB pin is internally connected to the output node and requires no external components - unlike the adjustable LM3673TL-ADJ/NOPB, which needs R1/R2 to set VOUT.
What thermal considerations apply to LM3673TL-1.2/NOPB in a DSBGA package?
The LM3673TL-1.2/NOPB has a junction-to-board thermal resistance (RθJB) of 110.3°C/W. To maintain TJ ≤125°C at 350 mA, ensure ≥2 cm² of exposed copper on the PCB bottom layer under the DSBGA pad, with ≥4 thermal vias (0.3 mm diameter) connecting to inner/ground planes. Avoid enclosing the device under shields without thermal relief.
Can LM3673TL-1.2/NOPB operate from a 2.5 V input?
No. The absolute minimum input voltage for LM3673TL-1.2/NOPB is 2.7 V per the Recommended Operating Ratings. At 2.5 V, the device may fail to start or regulate properly due to undervoltage lockout activation. System design must guarantee VIN ≥2.7 V before enabling the EN pin.
How does the enable (EN) pin behavior affect system power sequencing?
The EN pin of LM3673TL-1.2/NOPB must be driven above 1 V to enable operation and below 0.4 V to enter shutdown (0.01 µA IQ). It should never be left floating - tie to VIN through a pull-up or control via a GPIO. Proper sequencing requires EN assertion only after VIN stabilizes ≥2.7 V to prevent erratic startup or brownout conditions.
LM3673TL-1.2/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):
- 1.2V
- 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)
LM3673TL-1.2/NOPB FAQ
1.How can I place an order for LM3673TL-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3673TL-1.2/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 LM3673TL-1.2/NOPB reliable?
The price and inventory of LM3673TL-1.2/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3673TL-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM3673TL-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3673TL-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3673TL-1.2/NOPB?
LM3673TL-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3673TL-1.2/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 LM3673TL-1.2/NOPB?
For technical support, including LM3673TL-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3673TL-1.2/NOPB requirements.
6.How does Aetrix verify that LM3673TL-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3673TL-1.2/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 LM3673TL-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM3673TL-1.2/NOPB?
All LM3673TL-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3673TL-1.2/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 LM3673TL-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM3673TL-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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