My Inquiry
My Account
Texas Instruments LM3676SD-3.3/NOPB
- Part No.:
- LM3676SD-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LM3676SD-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 600MA 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,807
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM3676SD-3.3/NOPB 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 delivery in portable electronics. It features automatic PFM/PWM mode switching, 2 MHz fixed-frequency PWM operation, internal soft-start, and thermal/overcurrent protection. Used in mobile phones and WLAN modules where compact size and light-load efficiency are critical.
For engineers reviewing the LM3676SD-3.3/NOPB datasheet, LM3676SD-3.3/NOPB pinout, LM3676SD-3.3/NOPB application, or LM3676SD-3.3/NOPB equivalent, key selection considerations include its 3.3 V fixed output, 8-pin WSON package, 16 µA quiescent current in PFM mode, forced-PWM capability via MODE pin, and compatibility with only three external components (2.2 µH inductor + two ceramic capacitors).
Technical Context
The LM3676SD-3.3/NOPB employs voltage-mode control with input voltage feed-forward to maintain stable regulation across 2.9–5.5 V input and up to 600 mA load. Its internal 0.5 V reference and fixed feedback divider set VOUT = 3.3 V without external resistors.
It integrates complementary PFET and NFET switches with RDS(ON) of 380 mΩ (P) and 250 mΩ (N), enabling synchronous rectification. Mode control (pin 3) selects between continuous PWM (>1.0 V) or auto PFM-PWM (<0.4 V), with seamless transition at ~100 mA load under typical conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% - no external feedback resistors required; designed for direct powering of 3.3 V logic rails. |
| Max Output Current | 600 mA - sustained delivery across full input range (2.9–5.5 V) and ambient temperature (−30°C to +85°C). |
| Switching Frequency | 2 MHz typical (1.6–2.6 MHz range) - enables use of tiny 2.2 µH inductors and low-ESR ceramic capacitors. |
| Quiescent Current | 16 µA typical in PFM mode - extends battery life during standby or light-load operation in portable devices. |
| Shutdown Current | 0.01 µA typical - near-zero power draw when EN pin <0.4 V, critical for system-level power gating. |
| Input Voltage Range | 2.9 V to 5.5 V - matches single-cell Li-Ion battery discharge profile and USB-powered systems. |
| Protection Features | Thermal shutdown (150°C typ), cycle-by-cycle current limit (1020 mA typ), and undervoltage lockout - ensures robust operation under fault conditions. |
Pinout & Package
LM3676SD-3.3/NOPB uses an 8-lead non-pullback WSON package (Package Number NGQ0008A, 2.0 mm × 2.0 mm, 0.5 mm pitch, exposed thermal pad). The package supports high thermal performance (θJA = 56°C/W on 4-layer board) and requires solder reflow per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PGND | Power Ground | High-current return path for switch node; must be connected directly to thermal pad and low-impedance ground plane. |
| 2 SW | Switch Node | Connection to internal PFET drain and NFET source; routes high di/dt switching current to external inductor. |
| 3 MODE | Mode Control Input | Logic-controlled selection: >1.0 V = forced PWM; <0.4 V = auto PFM-PWM; floating prohibited. |
| 4 FB | Feedback Input | Internally tied to fixed 3.3 V divider; not user-accessible in fixed-output version - connect directly to VOUT capacitor. |
| 5 VIN | Input Power 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 grounding allowed. |
| 7 SGND | Signal Ground | Low-noise reference for feedback and control circuitry; separate from PGND but 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 diode, reducing conduction loss and improving efficiency at 3.3 V output. |
| Auto PFM/PWM Transition | Seamlessly shifts between 16 µA PFM (light load) and 2 MHz PWM (≥100 mA) - maintains >85% efficiency from 1 mA to 600 mA. |
| Minimal External Components | Only three passive parts needed: 2.2 µH inductor, 4.7 µF input cap, 10 µF output cap - reduces BOM count and PCB area. |
| Internal Soft-Start | Gradual current-limit ramp-up (70 → 140 → 280 → 1020 mA) prevents inrush current and output overshoot at startup. |
| Robust Protection Suite | Includes thermal shutdown (150°C), overcurrent limiting (1020 mA), and UVLO - eliminates need for external supervision circuits. |
Applications
| Mobile Phone Power Management | WLAN Module Core Supply |
|---|---|
Use Scenario: Powers baseband processor and RF transceiver subsystems from a single Li-Ion cell in slim smartphones. IC Role / Device Role / Timing Role: Primary 3.3 V buck regulator delivering regulated power with fast transient response to burst-mode communication loads. Use Value: 2 MHz switching enables small 2.2 µH inductor and 10 µF ceramic output cap, saving >30% board area vs. lower-frequency alternatives. |
Use Scenario: Supplies clean 3.3 V core voltage to IEEE 802.11a/b/g/n WLAN chipsets in handheld and IoT edge devices. IC Role / Device Role / Timing Role: High-efficiency DC-DC converter supporting dynamic power scaling during transmit/receive/idle cycles. Use Value: 16 µA quiescent current in PFM mode extends battery runtime during Wi-Fi sleep states without compromising RF performance. |
| Digital Still Camera Sensor Rail | Portable Instrument LCD Backlight Driver Support |
Use Scenario: Provides stable 3.3 V supply to CMOS image sensor and ISP in compact digital cameras and action cams. IC Role / Device Role / Timing Role: Low-noise power source with tight line/load regulation (0.031%/V, 0.0013%/mA) for analog pixel readout circuits. Use Value: Synchronous rectification and 2 MHz operation minimize output ripple (<15 mVpp), preventing image noise artifacts. |
Use Scenario: Powers LED driver ICs and display interface logic in portable test meters and handheld analyzers. IC Role / Device Role / Timing Role: Compact, thermally efficient regulator supporting intermittent high-current backlight pulses while maintaining long standby life. Use Value: Thermal shutdown (150°C) and 600 mA capability allow safe operation during extended backlight-on periods in sealed 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, 3–6 V input, 3.6 MHz switching, 17 µA IQ - higher frequency but narrower input range. | Better suited for 3.3 V systems powered from 3.3 V rails or regulated 5 V; less tolerant of deep Li-Ion discharge. | Select if board space is extremely constrained and input stays ≥3.0 V; verify thermal performance at 600 mA with 3.6 MHz switching. |
| AP3012KTR-G1 | 3.3 V fixed, 500 mA, 2.5–5.5 V input, 1.5 MHz, 25 µA IQ - lower max current, lower switching frequency, higher quiescent current. | Acceptable for cost-sensitive, lower-power applications (e.g., basic sensors) where 100 mA margin is acceptable. | Choose only if 500 mA load ceiling and larger inductor/capacitor footprint are acceptable trade-offs for lower unit cost. |
Compared with LM3676SD-3.3/NOPB, TPS62231DRYR offers faster transient response due to higher switching frequency but sacrifices Li-Ion compatibility below 3.0 V; AP3012KTR-G1 provides lower-cost implementation at the expense of 100 mA current headroom and reduced light-load efficiency.
Availability
LM3676SD-3.3/NOPB is available at Aetrix Electronics and suitable for mobile phone power management, WLAN module core supply, digital still camera sensor rails, and portable instrument LCD backlight driver support requiring stable component supply across production lifecycles.
Supply support for LM3676SD-3.3/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 and embedded processing technologies, with decades of expertise in power management IC design and high-volume manufacturing.
The LM3676 product line delivers highly integrated, low-quiescent-current DC-DC converters for battery-powered portable electronics - engineered specifically for space-constrained, energy-sensitive applications like smartphones and wireless peripherals.
FAQ
What is the recommended input capacitor for LM3676SD-3.3/NOPB?
A 4.7 µF, 6.3 V X7R/X5R ceramic capacitor placed adjacent to the VIN pin is recommended for LM3676SD-3.3/NOPB. This value meets minimum requirements (2.2 µF at 3 V bias) and suppresses high-frequency switching noise. Larger values improve input filtering but require careful DC bias derating - avoid Y5V dielectrics due to capacitance loss under bias.
Can LM3676SD-3.3/NOPB operate from a fully discharged Li-Ion cell?
LM3676SD-3.3/NOPB operates down to 2.9 V input, matching the usable discharge range of standard Li-Ion cells (3.0–4.2 V). Below 2.9 V, undervoltage lockout disables operation to protect system stability. For deeper discharge tolerance, consider the LM3676SD-ADJ with external feedback, though 3.3 V output would require VIN ≥3.6 V.
How does the MODE pin affect efficiency in LM3676SD-3.3/NOPB?
When MODE pin <0.4 V, LM3676SD-3.3/NOPB enters auto PFM-PWM mode, achieving 16 µA quiescent current at light loads (<100 mA) for maximum battery life. At >100 mA, it transitions to 2 MHz PWM for lowest output ripple and highest efficiency. Forced PWM (>1.0 V) maintains constant frequency but increases light-load IQ to ~35 µA.
Is an external feedback resistor network required for LM3676SD-3.3/NOPB?
No - LM3676SD-3.3/NOPB is a fixed-output variant with internal feedback divider set to 3.3 V. The FB pin connects directly to the output capacitor and must not be modified. External resistors are only required for the adjustable LM3676SD-ADJ version; using them with LM3676SD-3.3/NOPB will disrupt regulation.
What thermal considerations apply to LM3676SD-3.3/NOPB in 600 mA operation?
At 600 mA continuous load with 3.6 V input and 3.3 V output, LM3676SD-3.3/NOPB dissipates ~180 mW. With θJA = 56°C/W on a 4-layer board, junction temperature rise is ~10°C above ambient. Ensure the exposed thermal pad is soldered to ≥1 cm² copper pour and avoid enclosing the IC in thermally isolated areas to prevent thermal shutdown activation.
LM3676SD-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- 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):
- 2.9V
- 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/NOPB FAQ
1.How can I place an order for LM3676SD-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3676SD-3.3/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-3.3/NOPB reliable?
The price and inventory of LM3676SD-3.3/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-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM3676SD-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3676SD-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3676SD-3.3/NOPB?
LM3676SD-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3676SD-3.3/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-3.3/NOPB?
For technical support, including LM3676SD-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3676SD-3.3/NOPB requirements.
6.How does Aetrix verify that LM3676SD-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3676SD-3.3/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-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM3676SD-3.3/NOPB?
All LM3676SD-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3676SD-3.3/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-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM3676SD-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3676SD-3.3/NOPB Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
