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Texas Instruments LM3676SD-1.5/NOPB
- Part No.:
- LM3676SD-1.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LM3676SD-1.5/NOPB.pdf
- Description:
- IC REG BUCK 1.5V 600MA 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,233
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Product details
Overview
LM3676SD-1.5/NOPB from Texas Instruments is a fixed-output 1.5 V, 600 mA synchronous step-down DC-DC converter optimized for single Li-Ion battery-powered portable electronics. It operates from 2.9 V to 5.5 V input, delivers 2 MHz fixed-frequency PWM or auto PFM/PWM mode switching, and integrates internal PFET/NFET power switches with 0.5 V reference and soft-start. Used in mobile phones and digital cameras for efficient core voltage regulation.
For engineers reviewing the LM3676SD-1.5/NOPB datasheet, LM3676SD-1.5/NOPB pinout, LM3676SD-1.5/NOPB application, or LM3676SD-1.5/NOPB equivalent, key selection considerations include its 16 µA quiescent current in PFM mode, 0.01 µA shutdown current, integrated synchronous rectification, 8-pin WSON package, and mode-selectable efficiency optimization across light-to-heavy loads.
Technical Context
The LM3676SD-1.5/NOPB employs voltage-mode control with input voltage feed-forward to maintain stable output under line and load transients. Its internal 0.5 V reference feeds an error amplifier that regulates output by modulating PFET on-time, while synchronous NFET rectification eliminates external diode losses.
Mode control is implemented via dedicated MODE pin: >1.0 V forces continuous 2 MHz PWM for low-noise operation; <0.4 V enables automatic PFM/PWM transition at ~100 mA (VIN = 3.6 V), reducing IQ to 16 µA typ. EN pin provides logic-controlled shutdown with 0.01 µA supply current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5 V ±4% - tightly regulated rail for low-voltage digital cores without external feedback resistors. |
| Max Output Current | 600 mA - supports moderate-power processors, sensors, and RF ICs from single-cell Li-Ion input. |
| Input Voltage Range | 2.9 V to 5.5 V - compatible with discharged to fully charged Li-Ion (3.0–4.2 V) plus headroom for system rails. |
| Switching Frequency | 2 MHz typ (1.6–2.6 MHz) - enables use of small 2.2 µH inductor and 4.7 µF/10 µF ceramic capacitors. |
| Quiescent Current | 16 µA typ in PFM mode - extends battery life during standby or light-load operation in portable devices. |
| Shutdown Current | 0.01 µA typ - minimizes system leakage when powered off or in deep sleep states. |
| RDS(ON) (PFET/NFET) | 380 mΩ / 250 mΩ - low conduction loss improves efficiency, especially at 1.5 V output and high current. |
| Protection Features | Thermal shutdown (150°C), current limit (1020 mA typ), undervoltage lockout - ensures robust operation in compact layouts. |
Pinout & Package
LM3676SD-1.5/NOPB is housed in an 8-lead non-pullback WSON package (Package Number NGQ0008A), 2.0 mm × 2.0 mm × 0.75 mm, with exposed thermal pad for enhanced power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PGND | Power Ground | High-current return path for switch node; must be connected to low-impedance ground plane under thermal pad. |
| 2 SW | Switch Node | Connection to internal PFET drain and NFET source; routes high dv/dt switching waveform to external inductor. |
| 3 MODE | Mode Control Input | Logic-level input: >1.0 V = forced PWM; <0.4 V = auto PFM/PWM; floating prohibited. |
| 4 FB | Feedback Input | Internally connected to 1.5 V output divider; no external resistors required for fixed-version operation. |
| 5 VIN | Input Supply | Primary power input (2.9–5.5 V); requires local 4.7 µF ceramic capacitor placed adjacent to pin. |
| 6 NC | No Connect | Unbonded die pad; must remain unconnected and floating - no routing or soldering allowed. |
| 7 SGND | Signal Ground | Analog reference for FB, EN, MODE; routed separately from PGND and tied at single point near IC. |
| 8 EN | Enable Input | Active-high enable: >1.0 V = operational; <0.4 V = shutdown (0.01 µA ISHDN); floating prohibited. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Architecture | Integrated PFET/NFET switches eliminate external Schottky diode, enabling >90% efficiency at 300 mA (VIN = 3.6 V, VOUT = 1.5 V). |
| Auto PFM/PWM Mode Switching | Transitions seamlessly at ~100 mA load (VIN = 3.6 V), maintaining 16 µA IQ in PFM and low-noise 2 MHz PWM above threshold. |
| Internal 0.5 V Reference | Stable bandgap reference enables precise 1.5 V output without external components; supports adjustable variants via FB divider. |
| Soft-Start Function | Gradually ramps switch current limit (70 → 140 → 280 → 1020 mA) to limit inrush; typical start-up time is 275–400 µs. |
| Thermal & Overcurrent Protection | Thermal shutdown engages at 150°C (typ), disengages at 130°C (typ); cycle-by-cycle current limit trips at 1020 mA (typ). |
| Ultra-Low Shutdown Current | 0.01 µA typical draw in shutdown preserves battery charge during extended storage or system sleep modes. |
Applications
| Mobile Phones | MP3 Players |
|---|---|
Use Scenario: Powering baseband processor core and memory interface from single Li-Ion cell. IC Role / Device Role / Timing Role: Primary 1.5 V buck regulator delivering up to 600 mA with fast transient response to burst-mode CPU activity. Use Value: Maintains stable 1.5 V rail during 0–600 mA load steps with <±20 mV droop (Figure 14), minimizing timing margin loss in high-speed digital logic. |
Use Scenario: Supplying DSP, audio codec, and flash memory in ultra-portable audio players. IC Role / Device Role / Timing Role: Efficient 1.5 V power source operating in PFM mode during playback pause and PWM during decode bursts. Use Value: Achieves >85% efficiency at 10 mA (PFM) and >92% at 300 mA (PWM), extending playback time without thermal derating. |
| Digital Still Cameras | WLAN Modules |
Use Scenario: Providing image sensor interface and ISP core voltage in compact camera modules. IC Role / Device Role / Timing Role: Low-noise 1.5 V supply with 2 MHz PWM mode selected to minimize switching interference with analog pixel readout. Use Value: Delivers <10 mVPP output ripple in PWM mode (Figure 14), preventing noise coupling into sensitive analog signal chains. |
Use Scenario: Powering 2.4 GHz WLAN SoC baseband and RF front-end in handheld IoT devices. IC Role / Device Role / Timing Role: Compact, high-efficiency 1.5 V rail generator supporting dynamic power scaling between transmit/receive/idle states. Use Value: Enables rapid mode transitions (PFM↔PWM in <10 µs, Figure 19–20) to match WLAN MAC-layer duty cycling, reducing average system power. |
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 | 1.5 V fixed, 600 mA, 3–6 V input, 3.6 MHz switching, 17 µA IQ, same 6-pin WSON but different pinout (no MODE pin). | Lacks MODE pin control; operates only in automatic PFM/PWM - unsuitable where deterministic PWM-only operation is required. | Select if board space is critical and MODE control is unnecessary; verify layout compatibility due to differing pin assignment. |
| AP3012KTR-G1 | 1.5 V fixed, 500 mA, 2.5–5.5 V input, 1.5 MHz switching, 25 µA IQ, SOT-23-5 package with no MODE or SGND pins. | Lower current rating and no signal/power ground separation; higher IQ reduces light-load battery life vs. LM3676SD-1.5/NOPB. | Choose for cost-sensitive, lower-current applications where thermal performance and ground noise isolation are less critical. |
Compared with TPS62231DRVR and AP3012KTR-G1, LM3676SD-1.5/NOPB uniquely offers user-selectable PWM mode via MODE pin, dual-ground architecture (PGND/SGND), and superior 16 µA quiescent current - making it optimal for noise-sensitive, battery-constrained portable systems requiring both efficiency and controllability.
Availability
LM3676SD-1.5/NOPB is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, and WLAN modules requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM3676SD-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, with decades of expertise in high-efficiency DC-DC conversion for portable and industrial applications.
The LM3676 product line was designed specifically for space-constrained, battery-powered portable electronics - delivering high efficiency, low quiescent current, and minimal external component count in ultra-small WSON packages.
FAQ
What is the recommended input and output capacitor configuration for LM3676SD-1.5/NOPB?
The LM3676SD-1.5/NOPB requires a minimum 4.7 µF X7R/X5R ceramic input capacitor placed adjacent to the VIN pin and a 10 µF ceramic output capacitor at the VOUT node. These values ensure stable operation, low ripple (<10 mVPP), and adequate hold-up during load transients. Larger capacitance may improve filtering but is not required for basic functionality. The LM3676SD-1.5/NOPB datasheet specifies these values for all standard operating conditions.
Does LM3676SD-1.5/NOPB require external feedback resistors to set the output voltage?
No. The LM3676SD-1.5/NOPB is a fixed-output variant with internal resistor divider network configured for 1.5 V. The FB pin connects directly to the internal 0.5 V reference and output tap - no external resistors are needed or permitted. External resistors are only used with the LM3676SD-ADJ version. This simplifies design and improves accuracy for the LM3676SD-1.5/NOPB.
How does the MODE pin affect efficiency and noise performance of LM3676SD-1.5/NOPB?
When the MODE pin is pulled high (>1.0 V), LM3676SD-1.5/NOPB operates in forced PWM mode at 2 MHz, delivering lowest output noise and best line/load regulation - ideal for noise-sensitive analog circuits. When pulled low (<0.4 V), it enters auto PFM/PWM mode, reducing quiescent current to 16 µA typ at light loads to maximize battery life. The LM3676SD-1.5/NOPB transitions automatically at ~100 mA (VIN = 3.6 V) to balance efficiency and noise.
What thermal considerations apply to LM3676SD-1.5/NOPB in a 4-layer PCB layout?
The LM3676SD-1.5/NOPB has a junction-to-ambient thermal resistance (θJA) of 56°C/W on a standard 4-layer board. To maintain TJ ≤125°C, maximum power dissipation must be limited - e.g., at 600 mA and 3.6 V input, worst-case power loss is ~350 mW, resulting in ~20°C rise. Proper thermal pad soldering, 4+ vias to inner ground planes, and avoidance of copper isolation around the WSON package are essential for reliable LM3676SD-1.5/NOPB operation.
Can LM3676SD-1.5/NOPB operate with input voltage below 2.9 V?
No. The LM3676SD-1.5/NOPB is specified for 2.9 V to 5.5 V input operation. Below 2.9 V, undervoltage lockout disables switching, and the device will not regulate. TI recommends holding EN low until VIN reaches ≥2.9 V to prevent erratic startup. Attempting to operate LM3676SD-1.5/NOPB below this threshold risks unstable output, increased ripple, or failure to start - confirmed in the Absolute Maximum and Operating Ratings sections of the LM3676SD-1.5/NOPB datasheet.
LM3676SD-1.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- 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):
- 2.9V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 600mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (3x3)
LM3676SD-1.5/NOPB FAQ
1.How can I place an order for LM3676SD-1.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3676SD-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 LM3676SD-1.5/NOPB reliable?
The price and inventory of LM3676SD-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 LM3676SD-1.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM3676SD-1.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3676SD-1.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3676SD-1.5/NOPB?
LM3676SD-1.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3676SD-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 LM3676SD-1.5/NOPB?
For technical support, including LM3676SD-1.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3676SD-1.5/NOPB requirements.
6.How does Aetrix verify that LM3676SD-1.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3676SD-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 LM3676SD-1.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM3676SD-1.5/NOPB?
All LM3676SD-1.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3676SD-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 LM3676SD-1.5/NOPB part is unused and in its original packaging.
Return procedure for LM3676SD-1.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3676SD-1.5/NOPB Tags
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