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Texas Instruments LM3676SD-3.3
- Part No.:
- LM3676SD-3.3
- Manufacturer:
- Texas Instruments
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LM3676SD-3.3.pdf
- Description:
- IC REG BUCK 3.3V 600MA 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,089
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Product details
Overview
LM3676SD-3.3 from Texas Instruments is a fixed-output 3.3 V, 600 mA synchronous step-down DC-DC converter optimized for single Li-Ion battery (2.9–5.5 V input) power rails in portable electronics. It delivers up to 600 mA load current with 2 MHz fixed-frequency PWM operation, automatic PFM/PWM mode switching, and internal synchronous rectification. It is used in mobile phones and digital cameras to replace linear regulators for higher efficiency under variable load.
For engineers reviewing the LM3676SD-3.3 datasheet, LM3676SD-3.3 pinout, LM3676SD-3.3 application, or LM3676SD-3.3 equivalent, key selection criteria include its 3.3 V fixed output, 16 µA quiescent current in PFM mode, 0.01 µA shutdown current, 8-pin WSON package footprint, and mode-control flexibility between forced PWM and auto PFM-PWM operation.
Technical Context
The LM3676SD-3.3 implements voltage-mode control with input voltage feed-forward to maintain stable regulation across 2.9–5.5 V input. Its internal 0.5 V reference and fixed resistor divider set the 3.3 V output without external feedback components. The MODE pin selects between continuous 2 MHz PWM (low noise, high efficiency >100 mA) or auto PFM-PWM (16 µA IQ, extended battery life at light loads).
It integrates PFET and NFET power switches with typical RDS(ON) of 380 mΩ (P) and 250 mΩ (N), enabling synchronous rectification and eliminating external diodes. Protection includes cycle-by-cycle current limiting (1020 mA typ), thermal shutdown (150°C trip), and undervoltage lockout - all implemented within the 8-lead WSON-NGQ0008A package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% - no external resistors required; internally trimmed for accuracy across temperature. |
| Max Output Current | 600 mA - sustained over full input range (2.9–5.5 V) and junction temperature (−30°C to +125°C). |
| Switching Frequency | 2 MHz (typ) - enables use of tiny 2.2 µH inductor and 4.7 µF/10 µF ceramic capacitors; minimizes board area. |
| Quiescent Current | 16 µA (typ) in PFM mode - extends battery runtime during standby or light-load operation (e.g., display backlight off). |
| Shutdown Current | 0.01 µA (typ) - ensures near-zero system leakage when disabled via EN pin; critical for always-on subsystems. |
| Input Voltage Range | 2.9 V to 5.5 V - matches single-cell Li-Ion battery discharge profile and USB-powered systems. |
| Package | 8-pin WSON (NGQ0008A), 2.0 mm × 2.0 mm, 0.5 mm pitch - thermally enhanced non-pullback layout for compact portable PCBs. |
Pinout & Package
LM3676SD-3.3 is housed in an 8-lead non-pullback WSON package (Package Number NGQ0008A), with exposed thermal pad connected to PGND for improved heat dissipation in space-constrained layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: PGND | Power Ground | Main return path for high-current switch node; must be low-impedance copper pour tied to thermal pad. |
| 2: SW | Switch Node | Connection to internal PFET drain and NFET source; drives external inductor; requires tight layout to minimize EMI. |
| 3: MODE | Mode Control Input | Logic-level input: <0.4 V = Auto PFM-PWM; >1.0 V = Forced PWM; floating prohibited. |
| 4: FB | Feedback Input | Internally connected to fixed 3.3 V divider; not user-accessible - leave unconnected per datasheet for fixed versions. |
| 5: VIN | Input Supply | 2.9–5.5 V power input; 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 solder mask opening. |
| 7: SGND | Signal Ground | Analog reference for EN, MODE, and internal error amp; separate from PGND but tied at single point near IC. |
| 8: EN | Enable Input | Active-high logic control: <0.4 V = shutdown (0.01 µA IQ); >1.0 V = operational; floating prohibited. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Synchronous Rectification | Eliminates external Schottky diode; reduces conduction loss and improves efficiency by ≥10% at 3.3 V/300 mA vs. asynchronous designs. |
| Automatic PFM/PWM Mode Switching | Transitions seamlessly at ~100 mA load (VIN = 3.6 V); maintains >85% efficiency from 1 mA to 600 mA without manual configuration. |
| Integrated Soft-Start | Staged current limit ramp (70 → 140 → 280 → 1020 mA) prevents inrush into 10 µF output cap; startup time <400 µs at 300 mA load. |
| Thermal & Overcurrent Protection | Thermal shutdown at 150°C (typ), auto-recovery at 130°C; cycle-by-cycle current limit at 1020 mA (typ) protects against short-circuit faults. |
| Ultra-Low Shutdown Current | 0.01 µA typical draw in shutdown - enables long-term storage or deep-sleep modes in battery-backed IoT sensors. |
Applications
| Mobile Handsets | Digital Still Cameras |
|---|---|
|
Use Scenario: Powering baseband processor core voltage and camera sensor I/O interface from a single Li-Ion cell. IC Role / Device Role / Timing Role: Primary 3.3 V buck regulator delivering regulated supply with fast transient response to burst-mode imaging operations. Use Value: 2 MHz switching enables small 2.2 µH inductor and 10 µF ceramic output cap, reducing solution size by >40% vs. 500 kHz alternatives. |
Use Scenario: Supplying image signal processor (ISP) and LCD controller in compact point-and-shoot cameras. IC Role / Device Role / Timing Role: Fixed 3.3 V power stage with auto PFM-PWM mode to sustain >10-hour standby on 800 mAh battery. Use Value: 16 µA quiescent current in PFM mode extends battery life during viewfinder idle periods without compromising wake-up speed. |
| Portable WLAN Modules | MP3 Audio Players |
|
Use Scenario: Providing clean 3.3 V rail for RF transceiver and MAC controller in Bluetooth/Wi-Fi combo modules. IC Role / Device Role / Timing Role: Low-noise PWM-mode regulator (EN-controlled) synchronized to packet transmission bursts. Use Value: Forced PWM mode eliminates PFM frequency modulation noise that could interfere with 2.4 GHz RF reception sensitivity. |
Use Scenario: Powering DAC, headphone amplifier, and flash memory in battery-operated audio playback devices. IC Role / Device Role / Timing Role: High-efficiency step-down converter supporting dynamic load changes during file decode and audio playback. Use Value: Internal synchronous rectification achieves >92% peak efficiency at 3.3 V/200 mA, minimizing thermal rise in sealed plastic enclosures. |
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 | 3.3 V fixed, 600 mA, 3 MHz switching, 17 µA IQ in PFM - smaller 1.5 mm × 1.5 mm DRY package, but no MODE pin for forced PWM. | Lacks dedicated MODE pin; auto PFM-PWM only - unsuitable where deterministic low-noise PWM is required during data transmission. | Select when board space is critical and forced PWM is unnecessary; verify thermal performance at 600 mA in 1.5 mm² footprint. |
| AP3012KTR-G1 | 3.3 V fixed, 600 mA, 1.5 MHz switching, 25 µA IQ - uses external compensation, requires 3 additional passives, no integrated soft-start. | Higher BOM count and layout sensitivity; lacks thermal shutdown and current limit protection - needs external fault management. | Choose only for cost-sensitive, non-safety-critical consumer accessories where TI's reliability and protection features are not mandatory. |
Compared with TPS62231DRYR and AP3012KTR-G1, the LM3676SD-3.3 provides guaranteed forced PWM mode via MODE pin, integrated protection (thermal/current), and simpler 3-component design - making it preferred for robust portable systems requiring predictable noise behavior and field reliability.
Availability
LM3676SD-3.3 is available at Aetrix Electronics and suitable for mobile handsets, digital still cameras, portable WLAN modules, and MP3 audio players requiring stable component supply with consistent parametric performance and long-term lifecycle support.
Supply support for LM3676SD-3.3 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 ICs, with decades of experience in battery-powered portable power solutions.
The LM3676 product line was designed specifically for ultra-compact, high-efficiency DC-DC conversion in space- and battery-life-constrained portable electronics - emphasizing low IQ, small external component count, and robust protection.
FAQ
What is the output voltage tolerance of the LM3676SD-3.3?
The LM3676SD-3.3 has a fixed 3.3 V output with ±4% tolerance over temperature (−30°C to +125°C) and line (2.9–5.5 V input), as specified in the Electrical Characteristics table under VFB parameter. This tolerance reflects the internal resistor divider accuracy and reference stability - no external calibration is possible or required for this fixed-voltage variant.
Can the LM3676SD-3.3 operate with a 2.7 V input?
No - the LM3676SD-3.3 has a minimum operating input voltage of 2.9 V per its Absolute Maximum and Operating Ratings. Below 2.9 V, undervoltage lockout disables switching, and the device will not regulate. For 2.7 V start-up capability, consider the LM3676SD-ADJ with external feedback or alternate regulators like TPS62237.
Does the LM3676SD-3.3 require an external feedback resistor network?
No - the LM3676SD-3.3 uses an internal precision resistor divider to set the 3.3 V output. Pin 4 (FB) is internally connected and must be left unconnected (NC) per the datasheet; adding external components to FB will disrupt regulation and is not supported.
How does the MODE pin affect efficiency and noise in the LM3676SD-3.3?
When MODE is pulled high (>1.0 V), the LM3676SD-3.3 operates in forced PWM mode: constant 2 MHz switching yields lowest output voltage ripple (<15 mVpp) but higher light-load IQ (~35 µA). When MODE is pulled low (<0.4 V), it enters Auto mode: PFM reduces IQ to 16 µA at light loads but introduces variable-frequency noise - ideal for battery life vs. noise trade-offs.
What thermal derating applies to the LM3676SD-3.3 at 600 mA continuous load?
At 600 mA and ambient temperature of 60°C, the LM3676SD-3.3's maximum allowable power dissipation is 1.16 W (per Dissipation Ratings table). With typical RDS(ON) and switching losses, junction temperature remains below 125°C on a 4-layer board with proper PGND thermal pad connection - no derating needed if layout follows TI's WSON thermal guidelines.
LM3676SD-3.3 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):
- 3.3V
- 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-3.3 FAQ
1.How can I place an order for LM3676SD-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3676SD-3.3 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-3.3 reliable?
The price and inventory of LM3676SD-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3676SD-3.3 is usually 5 days.
3.What payment methods are accepted for LM3676SD-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3676SD-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3676SD-3.3?
LM3676SD-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3676SD-3.3 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-3.3?
For technical support, including LM3676SD-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3676SD-3.3 requirements.
6.How does Aetrix verify that LM3676SD-3.3 is sourced from the original manufacturer or authorized distributors?
All LM3676SD-3.3 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-3.3 meets industry standards.
7.What is the process for return or replacement of LM3676SD-3.3?
All LM3676SD-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM3676SD-3.3, 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-3.3 part is unused and in its original packaging.
Return procedure for LM3676SD-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3676SD-3.3 Tags
-
TPS562201DDCR
Texas Instruments
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MC34063ABD-TR
STMicroelectronics
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TPS561201DDCR
Texas Instruments
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MC33063ADR
Texas Instruments
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MC34063ADR
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TPS560200DBVR
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AP3012KTR-G1
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TLV61048DBVR
Texas Instruments
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AZ34063UMTR-G1
Diodes Incorporated
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TPS562200DDCR
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AP62300TWU-7
Diodes Incorporated
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MC34063EBD-TR
STMicroelectronics
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