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Texas Instruments LM3673TL-1.5/NOPB
- Part No.:
- LM3673TL-1.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-WFBGA, DSBGA
- Datasheet:
-
LM3673TL-1.5/NOPB.pdf
- Description:
- IC REG BUCK 1.5V 350MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:725
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Product details
Overview
LM3673TL-1.5/NOPB from Texas Instruments is a fixed-output 1.5 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 (typical), achieves 16 µA quiescent current in PFM mode, and requires only three external components: a 2.2 µH inductor and two ceramic capacitors (4.7 µF input, 10 µF output). It powers core logic rails in space-constrained mobile devices.
For engineers reviewing the LM3673TL-1.5/NOPB datasheet, LM3673TL-1.5/NOPB pinout, LM3673TL-1.5/NOPB application, or LM3673TL-1.5/NOPB equivalent, key selection criteria include its DSBGA-5 package footprint, automatic PFM/PWM mode transition at ~50–100 mA load, internal 0.5 V reference, 750 mA peak switch current limit, and thermal shutdown at 150°C.
Technical Context
The LM3673TL-1.5/NOPB uses voltage-mode control with input-voltage feed-forward to maintain tight line regulation across its 2.7–5.5 V input range. Its synchronous rectification employs an internal PFET high-side switch and NFET low-side rectifier, eliminating external diode losses and enabling high efficiency at low output voltages.
It implements three functional modes: fixed-frequency 2 MHz PWM above ~80 mA load, hysteretic PFM below ~50 mA (reducing IQ to 16 µA typical), and shutdown (<0.4 V on EN) drawing just 0.01 µA. Soft-start ramps switch current limit in discrete steps (70/140/280/750 mA) to limit inrush during enable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5 V ±2.5% - eliminates external feedback resistors and simplifies layout for dedicated rail generation. |
| Max Load Current | 350 mA - supports moderate-power digital cores (e.g., baseband processors, camera ISPs) without external current boosting. |
| Switching Frequency | 2 MHz typical - enables use of ultra-small 2.2 µH inductors and 0402/0603 ceramic capacitors, minimizing PCB area. |
| Quiescent Current | 16 µA typical in PFM mode - extends battery runtime during standby/sleep states in always-on subsystems. |
| Shutdown Current | 0.01 µA typical - ensures negligible drain during system deep-sleep or power-off, critical for long shelf life. |
| Input Voltage Range | 2.7 V to 5.5 V - fully covers discharge curve of single Li-Ion cell (4.2 V → 2.7 V) and accommodates 3.3 V/5 V rails. |
| Internal Reference | 0.5 V - sets feedback threshold; combined with fixed resistor divider inside die, defines precise 1.5 V output. |
Pinout & Package
LM3673TL-1.5/NOPB is housed in a 1.413 mm × 1.083 mm, 5-pin DSBGA (YZR) package with bottom-side solder balls. The package supports fine-pitch assembly and provides low thermal resistance (RθJA = 181 °C/W).
| 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 stabilize input during high di/dt switching. |
| GND (A3) | Ground Reference | System ground return path; connects directly to PCB ground plane under package for minimal inductance and thermal conduction. |
| SW (B2) | Switch Node | Connection to internal PFET drain and NFET source; routes high-frequency AC switching waveform to external inductor; requires tight loop layout. |
| EN (C1) | Enable Control | Digital input: <0.4 V disables device (0.01 µA ISHDN); >1 V enables operation; must not float-tie to VIN or controller GPIO via pull-up if unused. |
| FB (C3) | Feedback Input | Internally connected to fixed 1.5 V divider; shorted to VOUT in this variant-no external resistors required; sensitive analog node requiring clean routing. |
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 at >80 mA, optimizing battery life across dynamic usage profiles. |
| Internal Synchronous Rectification | Integrates both PFET high-side switch and NFET low-side rectifier-eliminates Schottky diode loss, enabling >90% efficiency at 1.5 V/200 mA with minimal BOM count. |
| Integrated Soft Start | Ramps switch current limit in four discrete steps (70→140→280→750 mA) during enable, limiting inrush into 10 µF output capacitor and preventing input rail collapse. |
| Thermal & Overcurrent Protection | Shuts down at 150°C junction temperature and limits peak switch current to 750 mA (typical), protecting IC and external inductor during overload or short-circuit events. |
| Ultra-Small System Footprint | Requires only three passive components (2.2 µH inductor, 4.7 µF CIN, 10 µF COUT)-enables complete 1.5 V regulator in <2.5 mm² board area, ideal for thin mobile form factors. |
Applications
| Mobile Phone Baseband Core | Portable Digital Camera ISP |
|---|---|
Use Scenario: Powers ARM-based baseband processor core in GSM/UMTS smartphones operating from single Li-Ion cell. IC Role / Device Role / Timing Role: Primary 1.5 V buck regulator delivering regulated power to CPU core domain with fast transient response. Use Value: 2 MHz switching enables compact 0603 inductor and 0402 capacitors; PFM mode extends talk-time by reducing idle current to 16 µA. | Use Scenario: Supplies image signal processor (ISP) in compact digital still cameras with variable processing load. IC Role / Device Role / Timing Role: Fixed 1.5 V point-of-load converter providing low-noise, tightly regulated supply independent of main system rail. Use Value: Internal soft start prevents ISP reset during power-up; thermal shutdown protects against lens motor-induced ambient rise. |
| Wireless LAN (WLAN) SoC Rail | MP3 Player Audio Codec |
Use Scenario: Generates 1.5 V supply for IEEE 802.11b/g/n WLAN transceiver SoC in handheld tablets and dongles. IC Role / Device Role / Timing Role: High-efficiency buck converter supporting burst-mode RF transmission with minimal voltage droop. Use Value: Automatic PFM-to-PWM transition at ~100 mA ensures stable 1.5 V during TX bursts while maintaining 16 µA IQ during RX/idle. | Use Scenario: Powers stereo audio codec in battery-operated MP3 players with extended playback requirements. IC Role / Device Role / Timing Role: Low-quiescent-current DC-DC source for analog/digital audio subsystem, minimizing background noise coupling. Use Value: 0.01 µA shutdown current preserves battery during pause/standby; DSBGA-5 package fits within narrow PCB edge zones. |
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 1.5 V output, 300 mA max, 3 MHz switching, 17 µA IQ in PFM mode, 6-pin WSON 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 space permits slightly larger package and 3 MHz operation improves EMI filtering. |
| AP63201WS-15 | Fixed 1.5 V output, 2 A max, 1.5 MHz switching, 25 µA IQ, 8-pin WDFN package (2.0 × 2.0 mm), integrated compensation. | Higher current capability and different frequency trade off size vs. headroom; not drop-in due to pin count and layout. | Select when future-proofing for higher load or needing integrated loop compensation without external RC network. |
Compared with TPS62231DRYR and AP63201WS-15, LM3673TL-1.5/NOPB offers the smallest package (1.41 × 1.08 mm), lowest shutdown current (0.01 µA), and optimal balance of 350 mA capability and 2 MHz switching for space-constrained 1.5 V rails-making it preferred for legacy mobile designs where footprint and ultra-low standby drain are critical.
Availability
LM3673TL-1.5/NOPB is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, portable instruments, and WLAN modules requiring stable component supply with long-term lifecycle support.
Supply support for LM3673TL-1.5/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 specializing in analog and embedded processing technologies, with leadership in power management ICs for portable and industrial applications.
The LM3673 product line was designed specifically for ultra-compact, high-efficiency DC-DC conversion in battery-powered portable electronics-emphasizing minimal external component count, low quiescent current, and robust protection features for Li-Ion systems.
FAQ
What is the recommended input capacitor for LM3673TL-1.5/NOPB?
The LM3673TL-1.5/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 stable input voltage during high di/dt switching events and suppresses high-frequency noise generated at the SW node. Larger values (e.g., 10 µF) may improve ripple rejection but are not required for basic functionality.
Does LM3673TL-1.5/NOPB require external feedback resistors?
No. LM3673TL-1.5/NOPB is a fixed-output variant with internal resistor divider network tied to the FB pin, setting VOUT precisely to 1.5 V. The FB pin is internally connected and must be routed directly to the output capacitor's VOUT node-no external resistors or compensation components are needed, simplifying design and reducing BOM cost.
What happens when the load exceeds 350 mA on LM3673TL-1.5/NOPB?
When load current exceeds 350 mA, the LM3673TL-1.5/NOPB activates its internal current-limit protection, clamping peak switch current at approximately 750 mA (typical). Output voltage will droop, and the device may enter thermal shutdown if sustained overload causes junction temperature to reach 150°C. It is not rated for continuous operation above 350 mA.
Can LM3673TL-1.5/NOPB operate from a 2.5 V input?
No. The LM3673TL-1.5/NOPB has a minimum recommended input voltage of 2.7 V per its absolute maximum and operating ratings. At 2.5 V, the device may fail to start, exhibit unstable regulation, or trigger undervoltage lockout. Operation is guaranteed only within 2.7 V to 5.5 V, covering the full usable range of a single Li-Ion cell.
How does the EN pin function on LM3673TL-1.5/NOPB?
The EN pin on LM3673TL-1.5/NOPB is a logic-controlled enable input: pulling it below 0.4 V places the device in shutdown mode (ISHDN ≈ 0.01 µA), while driving it above 1 V enables normal operation. The pin has 1 µA max input current and must never be left floating-TI recommends tying it to VIN through a 100 kΩ resistor or controlling it directly with a microcontroller GPIO.
LM3673TL-1.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-WFBGA, DSBGA
- 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):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.5V
- 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-1.5/NOPB FAQ
1.How can I place an order for LM3673TL-1.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3673TL-1.5/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-1.5/NOPB reliable?
The price and inventory of LM3673TL-1.5/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-1.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM3673TL-1.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3673TL-1.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3673TL-1.5/NOPB?
LM3673TL-1.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3673TL-1.5/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-1.5/NOPB?
For technical support, including LM3673TL-1.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3673TL-1.5/NOPB requirements.
6.How does Aetrix verify that LM3673TL-1.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3673TL-1.5/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-1.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM3673TL-1.5/NOPB?
All LM3673TL-1.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3673TL-1.5/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-1.5/NOPB part is unused and in its original packaging.
Return procedure for LM3673TL-1.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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