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Texas Instruments LM3679TL-1.8/NOPB
- Part No.:
- LM3679TL-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-WFBGA, DSBGA
- Datasheet:
-
LM3679TL-1.8/NOPB.pdf
- Description:
- IC REG BUCK 1.8V 350MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,247
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Product details
Overview
LM3679TL-1.8/NOPB from Texas Instruments is a 3 MHz, 350 mA synchronous step-down DC-DC converter optimized for ultra-low-profile mobile power rails. It delivers a fixed 1.8 V output from 2.5–5.5 V input (e.g., single Li-Ion), features automatic PFM/PWM mode switching, 16 µA typical quiescent current in light load, and internal synchronous rectification. It targets space-constrained applications such as digital still cameras and portable hard disk drives where height ≤ 0.55 mm is critical.
For engineers reviewing the LM3679TL-1.8/NOPB datasheet, LM3679TL-1.8/NOPB pinout, LM3679TL-1.8/NOPB application, or LM3679TL-1.8/NOPB equivalent, key selection criteria include its 5-bump DSBGA YZR package (0.6 mm height), 3 MHz fixed-frequency PWM operation, ±2.5% output voltage accuracy in PWM mode, integrated soft-start, and thermal/overcurrent protection - all validated for low-noise, battery-sensitive designs.
Technical Context
The LM3679TL-1.8/NOPB implements voltage-mode control with input voltage feed-forward to maintain stable regulation across 2.5–5.5 V input. Its internal 0.5 V reference and feedback network set the fixed 1.8 V output via resistorless configuration - no external divider required. The device transitions automatically between 3 MHz PWM mode (≥80 mA load) and hysteretic PFM mode (≤42 mA at VIN = 3.6 V) to optimize efficiency and battery life.
It integrates complementary PFET and NFET switches with RDS(ON) of 350 mΩ (P) and 150 mΩ (N) at 3.6 V, enabling high-efficiency synchronous rectification. Protection includes cycle-by-cycle current limiting (920 mA typ), thermal shutdown (150 °C trip), undervoltage lockout, and 0.01 µA shutdown current - all operating without external components beyond inductor and two ceramic capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V - no external feedback resistors needed; configured at wafer level for precision and layout simplicity. |
| Input Voltage Range | 2.5 V to 5.5 V - supports single-cell Li-Ion (fully charged to depleted) and regulated 3.3 V/5 V rails. |
| Max Output Current | 350 mA - sustained across full input range and temperature (−30°C to +125°C junction). |
| Switching Frequency | 3 MHz (typ) - enables use of tiny 1.0 µH shielded inductors and 0603 ceramic capacitors for minimal board area. |
| Quiescent Current | 16 µA (typ) in PFM mode - extends battery runtime during standby or light-load operation in portable devices. |
| Shutdown Current | 0.01 µA (typ) - ensures negligible drain when system is powered off via EN pin control. |
| Output Accuracy | ±2.5% in PWM mode - guaranteed over line, load, and temperature; critical for core logic and memory rail stability. |
| Package | 5-bump DSBGA YZR - lead-free (NOPB), 0.6 mm height, 0.4 mm pitch, NSMD pad design required for reliable reflow. |
Pinout & Package
LM3679TL-1.8/NOPB uses a 5-bump DSBGA YZR package (0.6 mm height, 0.4 mm pitch). Requires non-solder-mask-defined (NSMD) pads and precise reflow per TI SNVA009. Solder ball diameter is 300 µm; recommended pad size is 10.82 mils (0.275 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (A1) | Power input | Connects directly to input filter capacitor; accepts 2.5–5.5 V; must be decoupled within 2 mm for EMI suppression. |
| GND (A3) | Ground reference | Primary return path for PFET/NFET switches and control circuitry; requires low-impedance connection to power plane. |
| EN (C1) | Enable control | Active-high logic input; >1.0 V enables operation, <0.4 V forces shutdown; must not float - tie to host MCU GPIO or pull-up. |
| FB (C3) | Feedback node | Internally connected to 0.5 V reference; connects directly to output capacitor; no external resistor network required for 1.8 V version. |
| SW (B2) | Switching node | Drives external inductor; carries high di/dt; requires short, wide trace and ground pour clearance to minimize ringing and EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic PFM/PWM mode switching | Eliminates manual mode control; reduces IQ to 16 µA at light loads while maintaining 90%+ efficiency at 300 mA - ideal for burst-mode processors. |
| Internal synchronous rectification | Replaces lossy Schottky diode with integrated NFET (150 mΩ RDS(ON)); improves efficiency by ~8% at 1.8 V/300 mA vs. asynchronous alternatives. |
| Integrated soft-start | Ramps switch current limit in 200/400/600/920 mA steps; limits inrush to <1 A during startup into 10 µF COUT, preventing input rail collapse. |
| Thermal and overload protection | Shuts down at 150 °C junction and restarts at 130 °C; cycles current limit at 920 mA (typ) during short-circuit - protects IC and PCB without external sensing. |
| Ultra-low profile solution | With YPD package (0.3 mm) + LQM21PN1R0MC0 inductor + dual JMK107BJ475K caps, achieves 0.55 mm max height - meets strict Z-height requirements in slim cameras and SSDs. |
Applications
| Digital Still Cameras | Portable Hard Disk Drives |
|---|---|
Use Scenario: Powering image sensor and ISP core logic from single Li-Ion battery in sub-10 mm-thick camera modules. IC Role / Device Role / Timing Role: Primary 1.8 V buck regulator delivering clean, low-noise supply with fast transient response to handle sensor readout bursts. Use Value: 3 MHz switching avoids audible noise; 16 µA PFM current extends standby time; 0.55 mm solution height fits mechanical stackup constraints. | Use Scenario: Supplying 1.8 V interface and controller logic in 2.5-inch portable HDD enclosures with strict thermal and height limits. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter managing dynamic load steps during spin-up and data transfer. Use Value: Synchronous rectification maintains >90% efficiency at 300 mA; thermal shutdown prevents overheating in sealed enclosures. |
| Mobile Phones | MP3 Players |
Use Scenario: Generating 1.8 V core voltage for baseband processor or RF transceiver in multi-rail PMIC subsystems. IC Role / Device Role / Timing Role: Standalone buck converter providing independent, low-noise rail with minimal external parts count. Use Value: Automatic mode switching extends talk time; 5-bump DSBGA footprint saves PCB area vs. QFN; EN pin enables software-controlled power gating. | Use Scenario: Powering NAND flash memory and audio codec in compact, battery-operated MP3 players with tight BOM cost targets. IC Role / Device Role / Timing Role: Low-cost, high-integration DC-DC solution replacing linear regulators to improve battery life. Use Value: Only three external components (inductor + 2× caps) reduce BOM cost and assembly complexity; 0.01 µA shutdown minimizes shelf-life drain. |
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 |
|---|---|---|---|
| TPS62231DRVR | Fixed 1.8 V output, 3 MHz switching, but uses 6-pin WSON package (2.0 × 2.0 mm); higher 22 µA quiescent current in PFM mode. | Requires larger PCB footprint and lacks DSBGA's ultra-low height; better suited for non-Z-constrained layouts. | Select when board area is less critical than thermal performance - WSON offers superior θJA (60 °C/W vs. 85 °C/W). |
| AP63202WU-18 | 1.8 V fixed output, 2.5 A capability, 2.2 MHz switching, 8-pin WLCSP; no PFM mode - operates PWM-only with 25 µA IQ. | Over-specified current capacity increases cost and size; absence of PFM reduces light-load efficiency in battery-powered use cases. | Choose only if future-proofing for >350 mA loads is required; otherwise LM3679TL-1.8/NOPB provides optimal balance of size, IQ, and cost. |
Compared with TPS62231DRVR and AP63202WU-18, the LM3679TL-1.8/NOPB uniquely combines 5-bump DSBGA packaging (0.6 mm height), 16 µA PFM quiescent current, and 350 mA capability in a 3 MHz architecture - making it the only option meeting sub-0.55 mm total solution height with verified light-load efficiency for ultra-portable imaging and storage devices.
Availability
LM3679TL-1.8/NOPB is available at Aetrix Electronics and suitable for digital still cameras, portable hard disk drives, mobile phones, MP3 players, and W-LAN modules requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM3679TL-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 experience in high-reliability power conversion ICs.
The LM3679 belongs to TI's ultra-small-footprint DC-DC converter product line, designed specifically for space- and height-constrained portable electronics where traditional buck regulators cannot fit - emphasizing minimal external component count, low quiescent current, and robust protection.
FAQ
What is the output voltage tolerance of the LM3679TL-1.8/NOPB under full load and temperature?
The LM3679TL-1.8/NOPB guarantees ±2.5% output voltage accuracy over the full operating ambient temperature range (−30°C to +85°C), input voltage (2.5 V to 5.5 V), and load (0–350 mA) in PWM mode. This specification is confirmed in the Electrical Characteristics table of the SNVS510A datasheet and applies directly to the LM3679TL-1.8/NOPB variant.
Does the LM3679TL-1.8/NOPB require external feedback resistors to set its 1.8 V output?
No. The LM3679TL-1.8/NOPB is factory-configured with an internal feedback network tied to a 0.5 V reference, delivering a precise fixed 1.8 V output. No external resistors are needed - simplifying layout, reducing BOM count, and eliminating resistor tolerance errors that affect adjustable converters.
What is the recommended inductor for the LM3679TL-1.8/NOPB in a low-profile design?
Texas Instruments recommends the Murata LQM21PN1R0MC0 (1.0 µH, 1075 mA saturation current, 0.5 mm height) for low-profile applications. This inductor, combined with dual Taiyo Yuden JMK107BJ475K capacitors, enables a total solution height of ≤0.55 mm - as validated in the LM3679's typical application circuit and bill of materials.
How does the LM3679TL-1.8/NOPB transition between PWM and PFM modes?
The LM3679TL-1.8/NOPB automatically transitions based on load: at VIN = 3.6 V, it enters PFM mode below ~42 mA and returns to PWM above ~115 mA. Transition is triggered by zero-crossing detection and peak current thresholds - no external control required. This behavior is documented in Figures 18–19 and Section "PFM OPERATION" of the SNVS510A datasheet.
Is the LM3679TL-1.8/NOPB RoHS-compliant and lead-free?
Yes. The "/NOPB" suffix explicitly denotes lead-free (Pb-free) construction per JEDEC J-STD-609. The LM3679TL-1.8/NOPB meets RoHS Directive 2011/65/EU and TI's green chemistry standards, with SnAgCu solder balls and halogen-free molding compound.
LM3679TL-1.8/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):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 350mA
- Frequency - Switching:
- 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-DSBGA (1.41x1.08)
LM3679TL-1.8/NOPB FAQ
1.How can I place an order for LM3679TL-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3679TL-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 LM3679TL-1.8/NOPB reliable?
The price and inventory of LM3679TL-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 LM3679TL-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM3679TL-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3679TL-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3679TL-1.8/NOPB?
LM3679TL-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3679TL-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 LM3679TL-1.8/NOPB?
For technical support, including LM3679TL-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3679TL-1.8/NOPB requirements.
6.How does Aetrix verify that LM3679TL-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3679TL-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 LM3679TL-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM3679TL-1.8/NOPB?
All LM3679TL-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3679TL-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 LM3679TL-1.8/NOPB part is unused and in its original packaging.
Return procedure for LM3679TL-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3679TL-1.8/NOPB Tags
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