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Texas Instruments LM3677LEE-1.5/NOPB
- Part No.:
- LM3677LEE-1.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-UFDFN
- Datasheet:
-
LM3677LEE-1.5/NOPB.pdf
- Description:
- IC REG BUCK 1.5V 600MA 6USON
- Quantity:
- Payment:
- Shipping:
Inventory:460
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Product details
Overview
LM3677LEE-1.5/NOPB from Texas Instruments is a 3 MHz, 600 mA synchronous step-down DC-DC converter optimized for ultra-low-voltage circuits powered by a single Li-Ion cell (2.7 V to 5.5 V input). It delivers a fixed 1.5 V output with ±2.5% regulation accuracy in PWM mode, 16 µA typical quiescent current in PFM mode, and 0.01 µA shutdown current-enabling extended battery life in portable instrumentation and mobile audio subsystems.
For engineers reviewing the LM3677LEE-1.5/NOPB datasheet, LM3677LEE-1.5/NOPB pinout, LM3677LEE-1.5/NOPB application, or LM3677LEE-1.5/NOPB equivalent, key selection criteria include its 5-bump DSBGA package footprint, automatic PFM/PWM mode transition at ~42 mA (VIN = 3.6 V), internal synchronous rectification, and minimal external component count (only one inductor and two ceramic capacitors required).
Technical Context
The LM3677LEE-1.5/NOPB implements voltage-mode PWM control with input voltage feed-forward for stable line regulation, and transitions autonomously to hysteretic PFM mode under light load to reduce quiescent current. Its internal 0.5 V reference and fixed 1.5 V output are achieved via resistorless feedback-eliminating external divider components.
It integrates a PFET high-side switch (RDSON(P) = 450 mΩ max) and NFET synchronous rectifier (RDSON(N) = 250 mΩ max), enabling >90% efficiency at 300 mA output. Thermal shutdown engages at TJ = 150°C (typ.), and current limit is set at 1220 mA (typ.) to protect against overload and short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5 V ±2.5% (PWM mode); enables direct powering of low-voltage logic cores without external feedback resistors. |
| Input Voltage Range | 2.7 V to 5.5 V; supports full discharge curve of single-cell Li-Ion batteries (3.0 V–4.2 V nominal) with margin for transient dips. |
| Max Output Current | 600 mA continuous; sufficient for baseband processors, RF transceivers, and sensor hubs in compact handheld devices. |
| Switching Frequency | 3 MHz (2.5–3.5 MHz range); allows use of sub-1 mm height, 1.0 µH shielded inductors and 0603/0805 ceramic capacitors for <20 mm² solution size. |
| Quiescent Current | 16 µA typical in PFM mode; extends standby runtime in always-on subsystems such as real-time clocks or wake-on-event sensors. |
| Shutdown Current | 0.01 µA typical; ensures negligible battery drain during deep sleep or system power-off states. |
| Protection Features | Thermal shutdown (150°C), cycle-by-cycle current limiting (1220 mA typ.), undervoltage lockout (2.7 V min), and soft-start (300 µs typical with 10 µF COUT + 300 mA load). |
Pinout & Package
LM3677LEE-1.5/NOPB uses a lead-free 5-bump DSBGA package (YZR0005), measuring 1.0 mm × 1.0 mm × 0.5 mm, with 0.5 mm bump pitch and bottom-side thermal pad for enhanced heat dissipation in space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (A1) | Power supply input | Accepts 2.7–5.5 V; must be decoupled with ≥4.7 µF ceramic capacitor placed adjacent to pin to suppress switching noise and supply ripple. |
| GND (A3) | Ground reference | Primary return path for input/output currents and internal bias; requires low-impedance connection to PCB ground plane beneath package. |
| EN (C1) | Enable control input | Logic-level enable: device active when >1.0 V, shutdown when <0.4 V; must not float-tie to GND or microcontroller GPIO for power sequencing. |
| FB (C3) | Feedback node | Internally connected to 1.5 V output divider; no external resistors needed-pin is reserved and must remain unconnected per datasheet. |
| SW (B2) | Switching node | Drives external 1.0 µH inductor; carries high di/dt pulses-requires short, wide trace routing and tight loop area with CIN/COUT to minimize EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic PFM/PWM mode switching | Eliminates manual mode control; maintains >85% efficiency from 1 mA to 600 mA load without sacrificing noise performance at medium loads. |
| Internal synchronous rectification | Replaces lossy Schottky diode with integrated NFET (250 mΩ max RDSON), reducing conduction loss and improving full-load efficiency by ~8% vs. asynchronous designs. |
| Fixed 1.5 V output with no external feedback | Reduces BOM count and layout area-no resistor matching tolerance or temperature drift concerns affecting output accuracy. |
| Soft-start with stepped current limit | Prevents inrush current spikes during power-up; limits peak switch current to 200/400/600/1220 mA steps, ensuring controlled VOUT ramp without overshoot. |
| Thermal and current protection | Enables robust operation in sealed enclosures-thermal shutdown disables switching until junction cools to 130°C, while cycle-by-cycle current limit prevents inductor saturation during fault conditions. |
Applications
| Mobile Audio Subsystem | Digital Camera Core Logic |
|---|---|
Use Scenario: Powers DSP, codec, and memory interfaces in Bluetooth headphones and portable speakers operating from a single Li-Ion cell. IC Role / Device Role / Timing Role: Primary 1.5 V rail generator with fast transient response (<10 µs recovery from 10–100 mA load step) to maintain signal integrity during burst audio processing. Use Value: 16 µA PFM quiescent current extends playback time between charges; 3 MHz switching avoids audible beat frequencies in sensitive analog audio paths. | Use Scenario: Supplies core voltage to image sensor interface and JPEG encoder ASIC in compact digital still cameras. IC Role / Device Role / Timing Role: Stable 1.5 V source with ±2.5% regulation supporting high-speed parallel data buses and low-jitter clock domains. Use Value: Internal soft-start prevents reset glitches during camera power-on; thermal shutdown protects against overheating in enclosed lens barrels during extended capture sessions. |
| WLAN Baseband Processor | Portable Medical Sensor Hub |
Use Scenario: Delivers regulated 1.5 V to WLAN SoC baseband section in handheld hotspot devices with aggressive power cycling. IC Role / Device Role / Timing Role: High-efficiency buck converter synchronized to RF transmit/receive duty cycles-switches to PFM during idle intervals to conserve battery. Use Value: 0.01 µA shutdown current ensures zero drain during deep-sleep modes; 600 mA capability supports peak MAC-layer processing bursts without brownout. | Use Scenario: Powers multi-sensor fusion engine (ECG, SpO₂, accelerometer) in wearable health monitors requiring long-term clinical-grade accuracy. IC Role / Device Role / Timing Role: Primary power rail with low-noise PFM operation during sensor sampling and low-quiescent PWM during data transmission. Use Value: 3 MHz switching frequency places switching harmonics beyond medical ECG bandwidth (0.05–150 Hz), eliminating interference with physiological signal acquisition. |
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, 3 MHz switching, 600 mA rating-but uses 6-pin USON (NGE0006A) instead of DSBGA; higher IQ (25 µA typ. in PFM) and no soft-start. | Suitable for board-space-flexible designs where USON thermal performance is acceptable; less optimal for ultra-thin wearables due to 0.55 mm height vs. DSBGA's 0.5 mm. | Select if existing layout accommodates USON footprint and soft-start is managed externally; verify thermal derating at 85°C ambient. |
| AP63202WS6-15 | Fixed 1.5 V, 600 mA, but operates at 2.2 MHz (not 3 MHz); lower shutdown current (0.1 µA) but higher PFM IQ (20 µA); no integrated soft-start or thermal shutdown. | Better for cost-sensitive consumer electronics where 2.2 MHz allows slightly larger inductors; unsuitable for safety-critical or thermally constrained medical use. | Choose only for non-regulated portable accessories; avoid where thermal protection or precise startup timing is required. |
Compared with TPS62231DRYR and AP63202WS6-15, LM3677LEE-1.5/NOPB offers the smallest package (5-bump DSBGA), lowest PFM quiescent current (16 µA), and integrated soft-start-making it uniquely suited for space- and battery-life-constrained portable instrumentation where reliability and minimal external components are mandatory.
Availability
LM3677LEE-1.5/NOPB is available at Aetrix Electronics and suitable for mobile audio subsystems, digital camera core logic, WLAN baseband processors, and portable medical sensor hubs requiring stable component supply across production lifecycles.
Supply support for LM3677LEE-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 leader specializing in analog, embedded processing, and connectivity technologies, with over 90 years of innovation in power management ICs.
The LM3677 series was designed specifically for ultra-low-voltage, battery-powered portable electronics-delivering high efficiency, minimal footprint, and intelligent power-state management in a single-chip solution.
FAQ
What is the recommended input capacitor for LM3677LEE-1.5/NOPB?
A 4.7 µF, 6.3 V X5R/X7R ceramic capacitor (e.g., 0603 or 0805 case) is recommended for LM3677LEE-1.5/NOPB. It must be placed adjacent to the VIN pin with minimal trace length to suppress high-frequency switching noise. The minimum value is 2.2 µF at 3 V DC bias, including tolerances and temperature variation. Avoid Y5V dielectrics due to poor DC bias stability.
Does LM3677LEE-1.5/NOPB require external feedback resistors?
No, LM3677LEE-1.5/NOPB does not require external feedback resistors. It is a fixed-output variant with internal resistor divider configured for 1.5 V. The FB pin (C3) is reserved and must remain unconnected-adding external components will disrupt regulation and may damage the device.
What is the thermal shutdown behavior of LM3677LEE-1.5/NOPB?
LM3677LEE-1.5/NOPB activates thermal shutdown at TJ ≈ 150°C (typ.) and resumes normal operation once junction temperature falls to ≈130°C (typ.). This hysteresis prevents oscillation near trip point. During shutdown, all switching and bias circuitry is disabled, reducing current draw to <1 µA. The feature is fully internal and requires no external components.
Can LM3677LEE-1.5/NOPB operate from a 2.5 V input?
No-LM3677LEE-1.5/NOPB requires a minimum input voltage of 2.7 V per its Absolute Maximum Ratings and Operating Ratings. At 2.5 V, the device may fail to start, exhibit unstable regulation, or violate output accuracy specifications. For sub-2.7 V inputs, consider alternative regulators rated for lower VIN minima.
What inductor value is recommended for LM3677LEE-1.5/NOPB?
A 1.0 µH shielded inductor with ≥1375 mA saturation current rating is recommended for LM3677LEE-1.5/NOPB. Examples include FDK MIPSA2520D 1R0 or Murata LQM2HP 1R0. DCR should be ≤100 mΩ to maintain >90% efficiency at 600 mA. Unshielded inductors may be used in cost-sensitive applications but increase EMI risk.
LM3677LEE-1.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-UFDFN
- 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):
- 1.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 600mA
- Frequency - Switching:
- 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-USON (2x1.5)
LM3677LEE-1.5/NOPB FAQ
1.How can I place an order for LM3677LEE-1.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3677LEE-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 LM3677LEE-1.5/NOPB reliable?
The price and inventory of LM3677LEE-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 LM3677LEE-1.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM3677LEE-1.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3677LEE-1.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3677LEE-1.5/NOPB?
LM3677LEE-1.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3677LEE-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 LM3677LEE-1.5/NOPB?
For technical support, including LM3677LEE-1.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3677LEE-1.5/NOPB requirements.
6.How does Aetrix verify that LM3677LEE-1.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3677LEE-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 LM3677LEE-1.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM3677LEE-1.5/NOPB?
All LM3677LEE-1.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3677LEE-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 LM3677LEE-1.5/NOPB part is unused and in its original packaging.
Return procedure for LM3677LEE-1.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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