My Inquiry
My Account
Texas Instruments LM3673TL-ADJ/NOPB
- Part No.:
- LM3673TL-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-WFBGA, DSBGA
- Datasheet:
-
LM3673TL-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 350MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:9,006
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM3673TL-ADJ/NOPB from Texas Instruments is a 2-MHz, 350-mA synchronous step-down DC-DC converter optimized for single Li-Ion battery input (2.7 V to 5.5 V), delivering adjustable output voltage from 1.1 V to 3.3 V via external resistor divider on FB pin. It integrates PFET/NFET switches, internal soft-start, and automatic PFM/PWM mode switching - used in mobile phones, MP3 players, and portable instrumentation for efficient low-voltage rail generation.
For engineers reviewing the LM3673TL-ADJ/NOPB datasheet, LM3673TL-ADJ/NOPB pinout, LM3673TL-ADJ/NOPB application, or LM3673TL-ADJ/NOPB equivalent, key selection considerations include its 16-µA typical quiescent current in PFM mode, 0.01-µA shutdown current, 5-pin DSBGA package (1.413 mm × 1.083 mm), and requirement for only three external components: one 2.2-µH inductor and two ceramic capacitors (4.7 µF CIN, 10 µF COUT).
Technical Context
The LM3673TL-ADJ/NOPB employs voltage-mode control with input voltage feed-forward to maintain tight line regulation. Its internal 0.5-V reference enables precise feedback-based output adjustment across the 1.1 V–3.3 V range using an external R1/R2 divider, where R2 is typically 200 kΩ to limit divider current to 2.5 µA.
It operates in three distinct functional modes: fixed-frequency PWM (2 MHz typical) above ~80 mA load, hysteretic PFM at light loads (reducing IQ to 16 µA), and shutdown (<0.4 V on EN pin, drawing 0.01 µA). Protection includes cycle-by-cycle current limiting (750 mA typical), thermal shutdown (~150°C), and undervoltage lockout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports full discharge curve of single Li-Ion cell without dropout. |
| Output Voltage Range | 1.1 V to 3.3 V (adjustable) - set by external resistor divider on FB pin; internal 0.5-V reference. |
| Max Output Current | 350 mA - sustained across full input range and ambient temperature (−30°C to +85°C). |
| Switching Frequency | 1.6 MHz to 2.6 MHz (typical 2 MHz) - enables use of tiny 2.2-µH inductor and low-ESR ceramic caps. |
| Quiescent Current | 16 µA (typical, PFM mode) - extends battery life in standby or light-load operation. |
| Shutdown Current | 0.01 µA (typical) - minimizes battery drain when disabled via EN pin. |
| PFET RDSON | 350 mΩ (typical, VIN = 3.6 V) - limits conduction loss during high-duty-cycle LDO-like operation. |
Pinout & Package
LM3673TL-ADJ/NOPB is housed in a 5-pin DSBGA package (YZR), measuring 1.413 mm × 1.083 mm, with bottom-side ball layout optimized for compact portable PCBs and thermal performance (RθJA = 181.0°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (A1) | Power Input | Connects to input filter capacitor (4.7 µF); supplies internal bias and switch drivers; must be ≥2.7 V for enable. |
| GND (A3) | Ground Reference | Primary return path for power and feedback; requires low-impedance connection to minimize noise and thermal rise. |
| SW (B2) | Switch Node | Drives external inductor; connects internally to PFET drain and NFET source; requires short, low-inductance trace. |
| EN (C1) | Enable Control | Active-high logic input; device enabled when >1 V, shutdown when <0.4 V; must not float - tie to VIN or controller GPIO. |
| FB (C3) | Feedback Input | Analog input for output voltage sensing; connected to resistor divider (R1/R2) for ADJ version; internal 0.5-V reference sets VOUT = 0.5 × (1 + R1/R2). |
Key Features
| Feature | Design Value |
|---|---|
| Automatic PFM/PWM Mode Switching | Transitions seamlessly between high-efficiency PFM (16 µA IQ) at light loads and stable 2-MHz PWM under medium/heavy loads - no external control required. |
| Internal Synchronous Rectification | Integrated NFET replaces external Schottky diode, reducing forward drop and conduction loss - critical for >85% efficiency at 1.2–1.8 V outputs. |
| Internal Soft-Start | Ramps switch current limit in steps (70/140/280/750 mA) during EN assertion - prevents inrush into 10-µF COUT and stabilizes startup under 280 µs (150 mA load). |
| 100% Duty-Cycle LDO Support | PFET remains fully on when VIN ≈ VOUT, enabling regulation down to VIN,MIN = VOUT + ILOAD × (RDSON,PFET + RINDUCTOR) - maintains output during battery sag. |
| Three-Component Solution | Requires only one 2.2-µH inductor and two ceramic capacitors (CIN = 4.7 µF, COUT = 10 µF) - eliminates bulkier electrolytics and simplifies layout in space-constrained designs. |
Applications
| Mobile Phone Core Logic Supply | MP3 Player Audio Codec Rail |
|---|---|
Use Scenario: Powers ARM-based application processor core (1.2 V @ 300 mA) from a 3.6-V nominal Li-Ion battery. IC Role / Device Role / Timing Role: Primary buck regulator providing tightly regulated, low-noise core voltage with dynamic load response. Use Value: Maintains 1.2-V output within ±1.5% over 0–350 mA load and 2.7–4.5 V input, while drawing only 16 µA in standby - extending talk time by >12% vs. non-PFM alternatives. |
Use Scenario: Supplies clean 1.8-V bias to stereo DAC/ADC in portable audio player with 50-mA peak load. IC Role / Device Role / Timing Role: Low-ripple, fast-transient buck converter supporting real-time audio signal chain integrity. Use Value: Delivers <25 mVpp ripple in LDO mode near battery end-of-life and recovers from 50-mA load steps in <10 µs - preventing audible pop/click artifacts. |
| Digital Still Camera Image Sensor Bias | W-LAN Baseband Processor Rail |
Use Scenario: Generates 2.8-V analog supply for CMOS image sensor requiring low noise and minimal EMI during burst capture. IC Role / Device Role / Timing Role: High-frequency (2 MHz) buck converter minimizing switching noise coupling into sensitive analog pixel readout paths. Use Value: 2-MHz fixed frequency avoids interference with common IF bands; integrated synchronous rectification reduces thermal load in sealed camera housing. |
Use Scenario: Provides 1.5-V core voltage to IEEE 802.11b/g baseband IC with intermittent 200-mA transmit bursts. IC Role / Device Role / Timing Role: Efficient, transient-responsive power stage supporting duty-cycled RF operation. Use Value: Automatic PFM→PWM transition at ~100 mA (VIN = 3.6 V) ensures immediate response to TX demand while sustaining >90% efficiency at average 30-mA load. |
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; 400-mA rating; 6-pin WSON package (2.0 mm × 2.0 mm). | Not adjustable; larger footprint; higher frequency enables smaller inductor but increases EMI sensitivity. | Select when fixed 1.8-V output suffices and board area allows 2×2 mm package; avoid if adjustable voltage or minimal footprint is required. |
| AP63202WU-7 | Adjustable 0.6–5.5 V; 2-A rating; 2.2-MHz switching; 8-pin WLCSP (1.56 mm × 1.56 mm); integrated compensation. | Higher current capability and wider VOUT range; larger package and higher IQ (25 µA) in PFM mode. | Choose for future-proofing with higher load headroom or multi-rail flexibility; not optimal for ultra-low-IQ or strict size constraints of LM3673TL-ADJ/NOPB. |
Compared with TPS62231DRVR and AP63202WU-7, the LM3673TL-ADJ/NOPB offers the smallest footprint (1.413 mm × 1.083 mm), lowest quiescent current (16 µA), and proven integration for Li-Ion–powered portable systems - making it optimal where board space, battery life, and design simplicity are prioritized over higher current or wider voltage range.
Availability
LM3673TL-ADJ/NOPB is available at Aetrix Electronics and suitable for mobile phones, portable audio devices, and digital still cameras requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM3673TL-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 power management ICs, with decades of expertise in high-efficiency DC-DC conversion for portable electronics.
The LM3673TL-ADJ/NOPB belongs to TI's low-power, high-frequency buck converter product line - engineered specifically for space- and battery-constrained applications like smartphones, wearables, and handheld instruments operating from single-cell Li-Ion sources.
FAQ
What is the minimum input voltage required for LM3673TL-ADJ/NOPB to regulate a 1.5-V output?
The minimum input voltage depends on load current and component losses: VIN,MIN = VOUT + ILOAD × (RDSON,PFET + RINDUCTOR). For 1.5 V at 150 mA, with typical RDSON,PFET = 350 mΩ and RINDUCTOR = 100 mΩ, VIN,MIN ≈ 1.5 V + 0.15 A × 0.45 Ω = 1.57 V - but the device requires ≥2.7 V to enable operation per recommended ratings. Below 2.7 V, EN must remain low to prevent malfunction.
How do I calculate the resistor values for setting a 2.2-V output with LM3673TL-ADJ/NOPB?
Use the formula VOUT = 0.5 V × (1 + R1/R2). With R2 = 200 kΩ (recommended to limit divider current), solve for R1: R1 = R2 × ((VOUT / 0.5) − 1) = 200 kΩ × ((2.2 / 0.5) − 1) = 200 kΩ × 3.4 = 680 kΩ. Standard 681-kΩ (1%) resistor yields VOUT = 0.5 × (1 + 681/200) = 2.2025 V - well within typical feedback tolerance.
Does LM3673TL-ADJ/NOPB require an external compensation network?
No. The LM3673TL-ADJ/NOPB uses internal voltage-mode compensation with feed-forward; no external RC network is needed. Stability is ensured with the specified 2.2-µH inductor and 10-µF ceramic output capacitor. Layout adherence - especially short SW and GND traces - is critical to maintain phase margin without added components.
What protection features are integrated into LM3673TL-ADJ/NOPB?
The LM3673TL-ADJ/NOPB integrates cycle-by-cycle overcurrent limiting (750 mA typical), thermal shutdown (~150°C junction), undervoltage lockout (enables only above ~2.7 V), and soft-start to limit inrush. It also features 0.01-µA shutdown current and automatic PFM mode to reduce light-load stress on the battery - all without external components.
Can LM3673TL-ADJ/NOPB operate with ceramic capacitors only, or does it require tantalum or aluminum electrolytic types?
LM3673TL-ADJ/NOPB is fully compatible with ceramic capacitors only - in fact, the datasheet specifies 4.7 µF X5R/X7R CIN and 10 µF X5R/X7R COUT. Ceramic caps provide low ESR, small footprint, and reliability advantages; no tantalum or aluminum electrolytics are needed or recommended for standard operation.
LM3673TL-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-WFBGA, DSBGA
- 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):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.1V
- Voltage - Output (Max):
- 3.3V
- Current - Output:
- 350mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-DSBGA (1.41x1.08)
LM3673TL-ADJ/NOPB FAQ
1.How can I place an order for LM3673TL-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3673TL-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 LM3673TL-ADJ/NOPB reliable?
The price and inventory of LM3673TL-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 LM3673TL-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM3673TL-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3673TL-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3673TL-ADJ/NOPB?
LM3673TL-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3673TL-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 LM3673TL-ADJ/NOPB?
For technical support, including LM3673TL-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3673TL-ADJ/NOPB requirements.
6.How does Aetrix verify that LM3673TL-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3673TL-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 LM3673TL-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM3673TL-ADJ/NOPB?
All LM3673TL-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3673TL-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 LM3673TL-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM3673TL-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3673TL-ADJ/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…
