My Inquiry
My Account
Texas Instruments LM3673TL-1.8/NOPB
- Part No.:
- LM3673TL-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-WFBGA, DSBGA
- Datasheet:
-
LM3673TL-1.8/NOPB.pdf
- Description:
- IC REG BUCK 1.8V 350MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:720
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM3673TL-1.8/NOPB from Texas Instruments is a fixed-output 1.8 V, 350-mA synchronous step-down DC-DC converter optimized for single Li-Ion battery-powered portable electronics. It operates from 2.7 V to 5.5 V input, delivers 2 MHz fixed-frequency PWM switching with automatic PFM mode transition below ~100 mA, and achieves 16 µA typical quiescent current in light-load operation. Used in mobile phones and digital cameras for core logic rail regulation.
For engineers reviewing the LM3673TL-1.8/NOPB datasheet, LM3673TL-1.8/NOPB pinout, LM3673TL-1.8/NOPB application, or LM3673TL-1.8/NOPB equivalent, key selection criteria include its DSBGA-5 package footprint, internal 0.5 V reference, 750 mA peak switch current limit, shutdown current of 0.01 µA, and compatibility with only three external passive components (2.2 µH inductor, 4.7 µF input cap, 10 µF output cap).
Technical Context
The LM3673TL-1.8/NOPB implements voltage-mode control with input feed-forward compensation to maintain stable line regulation across 2.7–5.5 V input. Its integrated PFET/NFET synchronous rectifier pair enables high efficiency at low output voltages, with RDSON(P) = 450 mΩ max and RDSON(N) = 250 mΩ max at 25°C.
It features dual-mode operation: fixed 2 MHz PWM above ~80–100 mA load, and hysteretic PFM below that threshold-reducing IQ to 16 µA typical while maintaining ±2.5% feedback accuracy. Soft-start ramps switch current limit in discrete steps (70/140/280/750 mA), and thermal shutdown engages at TJ = 150°C (typical).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±2.5% over temperature and load; set by internal resistor divider referenced to 0.5 V FB threshold. |
| Max Output Current | 350 mA continuous; limited by thermal design and 750 mA peak switch current (open-loop). |
| Input Voltage Range | 2.7 V to 5.5 V; supports full operation from single Li-Ion (3.0–4.2 V) with margin for discharge and ripple. |
| Switching Frequency | 2 MHz typical (1.6–2.6 MHz range); enables use of tiny 2.2 µH inductor and ceramic capacitors without audible noise. |
| Quiescent Current | 16 µA typical in PFM mode; extends battery life in standby without compromising transient response. |
| Shutdown Current | 0.01 µA typical; ensures negligible drain during system sleep or power-off states. |
| Feedback Voltage | 0.5 V internal reference; determines output via VOUT = 0.5 V × (1 + R1/R2) for ADJ versions; fixed for LM3673TL-1.8/NOPB. |
Pinout & Package
LM3673TL-1.8/NOPB uses a 5-pin DSBGA (YZR) package measuring 1.413 mm × 1.083 mm, designed for ultra-compact portable PCB layouts with bottom-side solder ball termination.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (A1) | Power Input | Primary supply connection; must be decoupled with ≥4.7 µF ceramic capacitor close to pin to suppress switching noise and support peak current demands. |
| GND (A3) | Ground Reference | System ground return path for all internal circuits and power switches; requires low-impedance PCB plane connection. |
| SW (B2) | Switch Node | Connection to internal PFET drain and NFET source; carries high di/dt square wave; must route with minimal loop area to reduce EMI. |
| EN (C1) | Enable Control | Digital enable input; device powers up when EN > 1 V, shuts down when EN < 0.4 V; must not float-tie to VIN or controller GPIO with pull-up/down as needed. |
| FB (C3) | Feedback Input | Regulation sense point; internally connected to fixed 1.8 V divider; no external resistors required-direct connection to output capacitor improves stability and accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Rectification | Integrated PFET/NFET pair eliminates external Schottky diode, reducing conduction loss and improving efficiency at 1.8 V output by >10% vs. asynchronous designs. |
| Auto PFM/PWM Mode Switching | Seamlessly transitions between 2 MHz PWM (heavy load) and variable-frequency PFM (light load), maintaining >85% efficiency from 1 mA to 350 mA without manual mode control. |
| Internal Soft Start | Ramps current limit in four discrete steps (70→140→280→750 mA), limiting inrush current and preventing output overshoot during startup with 10 µF output capacitance. |
| Thermal & Overcurrent Protection | Combines cycle-by-cycle peak current limiting (750 mA typ) with thermal shutdown at 150°C (typ), enabling robust operation under short-circuit or high-ambient conditions. |
| Ultra-Small BOM | Requires only one 2.2 µH shielded inductor and two ceramic capacitors (4.7 µF CIN, 10 µF COUT), minimizing board area and bill-of-materials cost in space-constrained applications. |
Applications
| Mobile Phone Core Rail | Digital Still Camera Sensor Supply |
|---|---|
Use Scenario: Powers baseband processor I/O and memory interface rails in slim smartphone designs operating from single-cell Li-Ion battery. IC Role / Device Role / Timing Role: Primary 1.8 V step-down regulator delivering stable, low-noise power with fast load-transient response to handle burst-mode processing. Use Value: 2 MHz switching avoids AM radio band interference; 16 µA PFM IQ extends standby time; DSBGA-5 footprint saves >1.5 mm² vs. SOT-23 alternatives. | Use Scenario: Supplies image sensor analog and digital cores in compact digital cameras where thermal headroom is limited. IC Role / Device Role / Timing Role: Fixed-output buck converter providing clean 1.8 V bias with minimal external components and no need for trimming or feedback tuning. Use Value: Internal synchronous FETs eliminate heat-generating Schottky diode; thermal shutdown prevents damage during extended video capture sessions. |
| MP3 Player Audio Codec | Portable HDD Controller |
Use Scenario: Generates 1.8 V supply for audio codec DSP and ADC/DAC circuitry in battery-powered music players. IC Role / Device Role / Timing Role: Efficient DC-DC converter supporting dynamic load changes during playback, pause, and fast-forward operations. Use Value: Automatic PFM-to-PWM transition ensures consistent regulation during sudden current spikes (e.g., headphone driver activation) without external intervention. | Use Scenario: Powers 1.8 V logic interface of 2.5-inch portable hard disk drive controllers in ultraportable notebooks. IC Role / Device Role / Timing Role: High-current (350 mA) buck regulator handling intermittent high-load bursts during disk spin-up and data transfer. Use Value: 750 mA peak current limit accommodates inrush during motor start; 0.01 µA shutdown current prevents battery drain when HDD is idle. |
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 | Fixed 1.8 V, 300 mA, 3 MHz switching, 19 µA IQ, WSON-6 package (2.0 × 2.0 mm) | Higher frequency allows smaller inductor but larger footprint; lower max current limits use in higher-load scenarios. | Select when board layout permits larger package and 3 MHz operation is preferred for size reduction over thermal performance. |
| AP63201WS-7 | Fixed 1.8 V, 2 A, 1.5 MHz, 25 µA IQ, TSOT23-6 package; includes power-good flag | Higher current rating and PG output add functionality but increase solution size and cost for 350 mA use cases. | Choose only if future-proofing for >500 mA loads or system-level power sequencing is required. |
Compared with TPS62231DRYR and AP63201WS-7, LM3673TL-1.8/NOPB offers the smallest total solution area (DSBGA-5 + 3 passives), lowest shutdown current (0.01 µA), and optimal thermal performance per mm² in 350 mA portable applications-making it ideal where board space and battery longevity are primary constraints.
Availability
LM3673TL-1.8/NOPB is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, MP3 players, and portable instrumentation requiring stable component supply with long-term lifecycle support.
Supply support for LM3673TL-1.8/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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management ICs for industrial, automotive, and consumer markets.
The LM3673 product line was engineered specifically for ultra-low-power, space-constrained portable electronics-delivering high-efficiency DC-DC conversion with minimal external components and industry-leading quiescent current in sub-2 mm² packages.
FAQ
What is the recommended input capacitor for LM3673TL-1.8/NOPB?
The LM3673TL-1.8/NOPB datasheet specifies a minimum 4.7 µF X5R/X7R ceramic capacitor placed as close as possible to the VIN and GND pins. This value ensures sufficient charge reservoir for 2 MHz switching transients and maintains input voltage stability under 350 mA load steps. Larger values (e.g., 10 µF) improve ripple suppression but are not required for basic operation.
Does LM3673TL-1.8/NOPB require external feedback resistors?
No. LM3673TL-1.8/NOPB is a fixed-output variant with internal resistor divider network tied to the FB pin, setting VOUT precisely to 1.8 V. External resistors are only required for the adjustable LM3673TL-ADJ/NOPB version. Connecting resistors to FB on LM3673TL-1.8/NOPB will disrupt regulation and is not supported.
What thermal derating applies to LM3673TL-1.8/NOPB at 85°C ambient?
At TA = 85°C, LM3673TL-1.8/NOPB's maximum continuous output current reduces to approximately 280 mA due to its RθJA of 181°C/W. This derating ensures junction temperature remains below 125°C under worst-case load and PCB copper area conditions. Full 350 mA operation is guaranteed only up to TA = 65°C with adequate thermal vias and ground plane.
Can LM3673TL-1.8/NOPB operate from a 2.5 V input?
No. LM3673TL-1.8/NOPB has a minimum recommended input voltage of 2.7 V per TI's datasheet (Section 7.3). At 2.5 V, the device may fail to start or drop out of regulation due to insufficient headroom across the internal PFET's RDSON and inductor DCR-especially under load. Operation below 2.7 V is outside specified conditions and not guaranteed.
How does the soft-start function behave during repeated enable cycling of LM3673TL-1.8/NOPB?
Each rising edge on the EN pin triggers a full soft-start sequence in LM3673TL-1.8/NOPB, regardless of prior state. The internal ramp generator resets and re-executes the four-step current limit progression (70→140→280→750 mA), ensuring controlled inrush current and output voltage monotonicity even during rapid ON/OFF toggling in power-managed systems.
LM3673TL-1.8/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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- 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-1.8/NOPB FAQ
1.How can I place an order for LM3673TL-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3673TL-1.8/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-1.8/NOPB reliable?
The price and inventory of LM3673TL-1.8/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-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM3673TL-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3673TL-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3673TL-1.8/NOPB?
LM3673TL-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3673TL-1.8/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-1.8/NOPB?
For technical support, including LM3673TL-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3673TL-1.8/NOPB requirements.
6.How does Aetrix verify that LM3673TL-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3673TL-1.8/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-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM3673TL-1.8/NOPB?
All LM3673TL-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3673TL-1.8/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-1.8/NOPB part is unused and in its original packaging.
Return procedure for LM3673TL-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3673TL-1.8/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…
