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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Texas Instruments LM3676SD-ADJ/NOPB

Name: LM3676SD-ADJ/NOPB
Brand: Texas Instruments
SKU: LM3676SD-ADJ/NOPB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM3676SD-ADJ/NOPB

Manufacturer:: Texas Instruments

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-WFDFN Exposed Pad

Datasheet:: LM3676SD-ADJ/NOPB.pdf

Description:: IC REG BUCK ADJ 600MA 8WSON

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Product details

Overview

LM3676SD-ADJ/NOPB from Texas Instruments is a 2-MHz, 600-mA synchronous step-down DC-DC converter optimized for single Li-Ion battery (2.9V–5.5V) power rails in portable electronics. It delivers adjustable output voltage (1.1V–3.3V), features automatic PFM/PWM mode switching, internal soft-start, and integrated PFET/NFET switches with 380 mΩ/250 mΩ R_DS(ON). Used in mobile phones and digital cameras for efficient low-voltage core rail generation.

For engineers reviewing the LM3676SD-ADJ/NOPB datasheet, LM3676SD-ADJ/NOPB pinout, LM3676SD-ADJ/NOPB application, or LM3676SD-ADJ/NOPB equivalent, key selection criteria include its 16 µA quiescent current in PFM mode, 0.5 V internal reference, MODE/EN logic thresholds (1.0 V / 0.4 V), and WSON-8 package compatibility with space-constrained handheld designs.

Technical Context

The LM3676SD-ADJ/NOPB implements voltage-mode PWM control with input feed-forward for stable line regulation and uses internal synchronous rectification to eliminate external diode losses. Its feedback loop references a precise 0.5 V bandgap, requiring external resistor dividers (R1/R2) to set output voltage per V_OUT = 0.5 × (1 + R1/R2).

Operation includes three distinct states: forced PWM (MODE > 1.0 V), auto PFM/PWM (MODE < 0.4 V), and shutdown (EN < 0.4 V). In PFM mode, it achieves 16 µA typical I_Q by dynamically reducing switching frequency and entering sleep cycles when inductor current reaches zero.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.9 V to 5.5 V - supports full discharge curve of single Li-Ion cell without brownout.
Max Output Current	600 mA - sustained delivery across full input range and 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.
Quiescent Current	16 µA (typ) in PFM mode - extends battery life during standby or light-load operation.
Feedback Reference	0.5 V - sets output via external resistive divider; allows 1.1 V–3.3 V adjustment with ≤±4% V_FB tolerance.
R_DS(ON) (PFET/NFET)	380 mΩ / 250 mΩ (typ) - minimizes conduction loss and improves efficiency at medium loads.
Shutdown Current	0.01 µA (typ) - near-zero power draw when EN pin is pulled low.

Pinout & Package

LM3676SD-ADJ/NOPB uses an 8-lead non-pullback WSON package (Package Number NGQ0008A, 2.0 mm × 2.0 mm × 0.75 mm, exposed thermal pad).

Pin/Terminal	Circuit Role	Design Meaning
1 PGND	Power Ground	High-current return path for internal PFET/NFET switches; must be connected to low-impedance ground plane.
2 SW	Switch Node	Connection point between internal PFET drain and NFET source; routes 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	Analog input referenced to 0.5 V; connects to resistor divider output for adjustable V_OUT.
5 VIN	Power Input	Main supply input (2.9–5.5 V); requires local 4.7 µF ceramic capacitor placed adjacent to pin.
6 NC	No Connect	Internally unconnected; must remain floating-no PCB trace or component connection.
7 SGND	Signal Ground	Low-noise reference for FB, MODE, EN; isolated from PGND in layout to reduce noise coupling.
8 EN	Enable Input	Active-high enable: >1.0 V = operational; <0.4 V = shutdown with 0.01 µA I_SHDN.

Key Features

Feature	Design Value
Automatic PFM/PWM mode switching	Reduces quiescent current to 16 µA at light loads while maintaining fast transient response during load steps.
Internal synchronous rectification	Eliminates external Schottky diode; improves efficiency by 8–12% at 3.3 V output vs. asynchronous buck.
Integrated soft-start	Staged current limit (70/140/280/1020 mA) prevents inrush current and output overshoot during startup.
Thermal & current protection	Auto-recovering thermal shutdown (150°C trip) and cycle-by-cycle peak current limiting (1020 mA typ) ensure robustness under fault conditions.
100% duty-cycle LDO mode	Enables dropout operation down to V_IN ≈ V_OUT + I_LOAD × (R_DS(ON) + R_INDUCTOR); ripple remains ~25 mV.

Applications

Mobile Phone Power Management	Digital Still Camera Core Rail
Use Scenario: Supplying 1.8 V core voltage to baseband processor and RF transceiver in slim smartphone form factor. IC Role / Device Role / Timing Role: Primary step-down regulator converting 3.6 V Li-Ion battery to stable 1.8 V rail with dynamic PFM/PWM mode switching during call/idle transitions. Use Value: 16 µA quiescent current in PFM mode extends standby time; 2 MHz switching avoids AM radio band interference.	Use Scenario: Generating 2.5 V analog sensor bias and 1.2 V image signal processor (ISP) core voltage in compact DSC modules. IC Role / Device Role / Timing Role: Dual-rail generator using two LM3676SD-ADJ/NOPB units-one configured for 2.5 V (R1=402 kΩ, R2=100 kΩ), one for 1.2 V (R1=280 kΩ, R2=200 kΩ). Use Value: Adjustable output eliminates need for multiple fixed-voltage SKUs; WSON-8 footprint saves board area versus SOIC alternatives.
WLAN Module DC-DC Conversion	Portable Instrument Low-Noise Supply
Use Scenario: Providing clean 3.3 V supply to IEEE 802.11b/g/n WLAN chipset operating in burst transmit/receive modes. IC Role / Device Role / Timing Role: High-efficiency buck converter delivering up to 600 mA peak during TX bursts; MODE pin held high for forced PWM to minimize output ripple. Use Value: 2 MHz fixed-frequency operation ensures predictable EMI profile; internal synchronous rectification reduces heat rise in sealed module enclosures.	Use Scenario: Powering precision ADC front-end and microcontroller in handheld multimeter or data logger with battery-only operation. IC Role / Device Role / Timing Role: Low-noise, low-quiescent regulator supplying 1.5 V to ADC reference and 3.0 V to MCU; SGND/PGND separation maintains signal integrity. Use Value: 0.5 V reference and ±4% FB tolerance support accurate output setting; shutdown current <0.02 µA preserves battery over months of storage.

Mobile Phone Power Management

Digital Still Camera Core Rail

Use Scenario: Supplying 1.8 V core voltage to baseband processor and RF transceiver in slim smartphone form factor.

IC Role / Device Role / Timing Role: Primary step-down regulator converting 3.6 V Li-Ion battery to stable 1.8 V rail with dynamic PFM/PWM mode switching during call/idle transitions.

Use Value: 16 µA quiescent current in PFM mode extends standby time; 2 MHz switching avoids AM radio band interference.

Use Scenario: Generating 2.5 V analog sensor bias and 1.2 V image signal processor (ISP) core voltage in compact DSC modules.

IC Role / Device Role / Timing Role: Dual-rail generator using two LM3676SD-ADJ/NOPB units-one configured for 2.5 V (R1=402 kΩ, R2=100 kΩ), one for 1.2 V (R1=280 kΩ, R2=200 kΩ).

Use Value: Adjustable output eliminates need for multiple fixed-voltage SKUs; WSON-8 footprint saves board area versus SOIC alternatives.

WLAN Module DC-DC Conversion

Portable Instrument Low-Noise Supply

Use Scenario: Providing clean 3.3 V supply to IEEE 802.11b/g/n WLAN chipset operating in burst transmit/receive modes.

IC Role / Device Role / Timing Role: High-efficiency buck converter delivering up to 600 mA peak during TX bursts; MODE pin held high for forced PWM to minimize output ripple.

Use Value: 2 MHz fixed-frequency operation ensures predictable EMI profile; internal synchronous rectification reduces heat rise in sealed module enclosures.

Use Scenario: Powering precision ADC front-end and microcontroller in handheld multimeter or data logger with battery-only operation.

IC Role / Device Role / Timing Role: Low-noise, low-quiescent regulator supplying 1.5 V to ADC reference and 3.0 V to MCU; SGND/PGND separation maintains signal integrity.

Use Value: 0.5 V reference and ±4% FB tolerance support accurate output setting; shutdown current <0.02 µA preserves battery over months of storage.

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-MHz switching frequency; 400-mA max output; 17 µA I_Q; same WSON-6 package but different pinout and no MODE pin.	Lacks programmable mode control; limited to PWM-only or automatic eco-mode-no user-selectable PFM/PWM toggle.	Choose when board space is critical and 400 mA suffices; avoid if MODE pin control or 600 mA headroom is required.
TPS62260DRVR	2.25-MHz frequency; 600-mA output; 19 µA I_Q; includes MODE pin but uses different FB reference (0.6 V) and requires different resistor scaling.	0.6 V reference increases resistor-divider current; less optimal for ultra-low-power PFM operation than 0.5 V reference.	Select for newer TI designs where 0.6 V reference simplifies sourcing; verify FB network stability per datasheet compensation guidelines.

Compared with TPS62231DRYR and TPS62260DRVR, LM3676SD-ADJ/NOPB offers superior light-load efficiency via its 0.5 V reference and dedicated MODE pin, enabling deterministic PFM entry/exit-critical for battery runtime optimization in intermittent-use portable devices.

Availability

LM3676SD-ADJ/NOPB is available at Aetrix Electronics and suitable for mobile phone power management, digital still camera core rails, WLAN module DC-DC conversion, and portable instrument low-noise supply requiring stable component supply across production lifecycles.

Supply support for LM3676SD-ADJ/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 connectivity technologies, with decades of expertise in power management ICs for portable and industrial applications.

The LM3676 product line was designed specifically for high-efficiency, small-footprint DC-DC conversion in battery-powered handheld devices-emphasizing ultra-low quiescent current, integrated power switches, and flexible mode control for runtime optimization.

FAQ

What is the minimum input voltage required for LM3676SD-ADJ/NOPB to regulate a 1.5 V output?

The minimum input voltage depends on load current and component resistances: V_IN,MIN = V_OUT + I_LOAD × (R_DS(ON)(P) + R_INDUCTOR). For 1.5 V at 300 mA with typical 380 mΩ PFET R_DS(ON) and 100 mΩ inductor DCR, V_IN,MIN ≈ 1.5 V + 0.3 A × 0.48 Ω = 1.64 V-but the device requires ≥2.9 V to operate per absolute ratings. So 2.9 V is the functional minimum regardless of calculation.

How do I configure LM3676SD-ADJ/NOPB for a 2.8 V output?

Use the formula V_OUT = 0.5 V × (1 + R1/R2). With R2 = 100 kΩ (per Table 1), R1 = 464 kΩ yields 2.8 V. Add C1 = 8.2 pF and C2 = 33 pF for stability, as specified in TI's Application Information section for outputs >2.5 V. Place R1 between VOUT and FB, R2 between FB and SGND.

Does LM3676SD-ADJ/NOPB require external compensation components?

Yes-LM3676SD-ADJ/NOPB requires external RC compensation for stability when configured as adjustable. For V_OUT ≥ 2.5 V, both C1 and C2 are mandatory (e.g., 8.2 pF and 33 pF for 2.8 V). For V_OUT ≤ 2.5 V, only C1 is needed. Values are derived from pole/zero placement formulas in the datasheet's APPLICATION INFORMATION section.

Can LM3676SD-ADJ/NOPB operate in 100% duty cycle mode?

Yes-LM3676SD-ADJ/NOPB supports LDO-like operation at 100% duty cycle when V_IN is close to V_OUT, enabling dropout regulation. During this mode, the PFET remains fully enhanced, delivering V_OUT ≈ V_IN − I_LOAD × R_DS(ON)(P). Output ripple rises to ~25 mV, and switching ceases.

What is the thermal performance of LM3676SD-ADJ/NOPB on a standard 4-layer PCB?

On a JEDEC-standard 4-layer board (2 oz Cu), LM3676SD-ADJ/NOPB has θ_JA = 56°C/W. At 600 mA output and 3.6 V input, power dissipation is ~0.36 W, resulting in ~20°C junction-to-ambient rise above ambient. Thermal shutdown activates at 150°C (typ), providing margin for continuous operation up to +85°C ambient.

LM3676SD-ADJ/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:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 2.9V

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 1.1V

Voltage - Output (Max):: 3.3V

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-ADJ/NOPB FAQ

1.How can I place an order for LM3676SD-ADJ/NOPB through Aetrix?

Please submit a Request for Quotation (RFQ) for LM3676SD-ADJ/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-ADJ/NOPB reliable?

The price and inventory of LM3676SD-ADJ/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-ADJ/NOPB is usually 5 days.

3.What payment methods are accepted for LM3676SD-ADJ/NOPB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3676SD-ADJ/NOPB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM3676SD-ADJ/NOPB?

LM3676SD-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM3676SD-ADJ/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-ADJ/NOPB?

For technical support, including LM3676SD-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3676SD-ADJ/NOPB requirements.

6.How does Aetrix verify that LM3676SD-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?

All LM3676SD-ADJ/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-ADJ/NOPB meets industry standards.

7.What is the process for return or replacement of LM3676SD-ADJ/NOPB?

All LM3676SD-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3676SD-ADJ/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-ADJ/NOPB part is unused and in its original packaging.

Return procedure for LM3676SD-ADJ/NOPB:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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