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Texas Instruments LM3677LEE-1.8/NOPB
- Part No.:
- LM3677LEE-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-UFDFN
- Datasheet:
-
LM3677LEE-1.8/NOPB.pdf
- Description:
- IC REG BUCK 1.8V 600MA 6USON
- Quantity:
- Payment:
- Shipping:
Inventory:489
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Product details
Overview
LM3677LEE-1.8/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 (2.7V–5.5V input). It delivers a fixed 1.8 V output with ±2.5% regulation, 16 µA typical quiescent current in PFM mode, and internal PFET/NFET synchronous rectification. It targets mobile phone core logic and memory rails requiring compact, high-efficiency power delivery.
For engineers reviewing the LM3677LEE-1.8/NOPB datasheet, LM3677LEE-1.8/NOPB pinout, LM3677LEE-1.8/NOPB application, or LM3677LEE-1.8/NOPB equivalent, key selection criteria include its 5-bump DSBGA package footprint, automatic PWM/PFM mode switching, 0.01 µA shutdown current, and minimal external component count (inductor + two ceramic caps).
Technical Context
The LM3677LEE-1.8/NOPB employs voltage-mode control with input voltage feed-forward to maintain tight line regulation across its 2.7V–5.5V input range. Its 3 MHz (typ.) fixed-frequency PWM operation ensures predictable EMI behavior and enables use of sub-1 mm height inductors.
Under light load, it transitions autonomously to hysteretic PFM mode-reducing switching frequency and bias current to 16 µA (typ.)-while maintaining output regulation within ±4.0% of nominal via dual PFM comparators. Internal soft-start limits inrush current using stepped current-limit thresholds (200/400/600/1220 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±2.5% - stable supply for 1.8 V I/O or core logic without external feedback resistors. |
| Max Output Current | 600 mA - sufficient for baseband processors or camera modules in portable devices. |
| Switching Frequency | 3 MHz (typ.), 2.5–3.5 MHz (min–max) - enables <20 mm² total solution size with tiny 1.0 µH inductor. |
| Quiescent Current | 16 µA (typ.) in PFM mode - extends battery life during standby or low-activity states. |
| Shutdown Current | 0.01 µA (typ.) - negligible drain during system sleep or power-off sequences. |
| Input Voltage Range | 2.7 V to 5.5 V - compatible with single-cell Li-Ion (fully charged to depleted) and regulated 3.3 V rails. |
| Internal FET RDS(ON) | PFET: 450 mΩ max, NFET: 250 mΩ max - enables >90% efficiency at 300 mA load with 3.6 V input. |
Pinout & Package
LM3677LEE-1.8/NOPB uses a lead-free 5-bump DSBGA package (YZR0005), measuring 1.0 mm × 1.0 mm × 0.55 mm, with 0.5 mm pitch and bottom-side thermal pad for enhanced thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Connects to input filter capacitor; accepts 2.7–5.5 V; must be ≥2.7 V before enabling. |
| GND | Ground reference | Primary return path for input, output, and internal circuitry; requires low-impedance PCB plane connection. |
| EN | Enable control | Active-high logic input; device enabled when >1.0 V, shutdown when <0.4 V; must not float. |
| FB | Feedback node | Internally connected to 0.5 V reference; unused in fixed-output variants like LM3677LEE-1.8/NOPB. |
| SW | Switching node | Drives external inductor; connects internally to PFET drain and NFET source; requires short, low-inductance trace. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic PWM/PFM mode switching | Transitions at ~42 mA (PWM→PFM) and ~115 mA (PFM→PWM) at VIN = 3.6 V - eliminates manual mode control while optimizing efficiency across full load range. |
| Internal synchronous rectification | Integrated PFET/NFET switches replace external diode - reduces conduction loss and improves efficiency by up to 10% vs. asynchronous designs at 1.8 V output. |
| Soft-start with stepped current limit | Four-step ramp (200/400/600/1220 mA) - prevents input rail collapse and output overshoot during startup into capacitive loads. |
| Thermal & current protection | Thermal shutdown activates at TJ ≈ 150 °C; cycle-by-cycle current limit trips at 1220 mA (typ.) - safeguards IC and external components under fault conditions. |
| Minimal external components | Only one 1.0 µH inductor and two ceramic capacitors (4.7 µF CIN, 10 µF COUT) required - reduces BOM cost, board area, and design validation effort. |
Applications
| Mobile Phone Baseband Power | Digital Camera Sensor Rail |
|---|---|
Use Scenario: Powers ARM-based baseband processor core and I/O domains in slim smartphone designs. IC Role / Device Role / Timing Role: Primary 1.8 V buck regulator delivering up to 600 mA with fast transient response to burst-mode processing loads. Use Value: 3 MHz switching enables use of 1.0 µH shielded inductor under 1 mm height, meeting strict Z-height constraints in modern handset stacks. | Use Scenario: Supplies image sensor and ISP interface logic in compact digital still cameras. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter providing clean, low-noise 1.8 V rail with <1% ripple under dynamic pixel readout loads. Use Value: 16 µA PFM quiescent current extends battery runtime during viewfinder standby without compromising startup speed. |
| Portable Media Player Audio Codec | W-LAN Module Core Supply |
Use Scenario: Generates 1.8 V supply for high-fidelity audio codec ICs in MP3 players with OLED displays. IC Role / Device Role / Timing Role: Efficient, low-EMI power stage operating in PWM mode during playback and PFM during pause/standby. Use Value: Synchronous rectification and 3 MHz fixed frequency minimize conducted noise coupling into sensitive analog audio paths. | Use Scenario: Powers 1.8 V logic and RF front-end bias in IEEE 802.11b/g/n WLAN modules embedded in tablets. IC Role / Device Role / Timing Role: Compact, thermally robust buck converter supporting intermittent high-current TX bursts (up to 600 mA peak). Use Value: DSBGA package with thermal pad maintains junction temperature below 125 °C even at 85 °C ambient during sustained TX operation. |
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 output, 3 MHz switching, 600 mA rating, 5-pin WSON package (1.5×1.5 mm); 18 µA quiescent current in PFM mode. | Same functional role but larger footprint; lacks integrated soft-start ramp steps. | Select when board layout allows 1.5 mm × 1.5 mm package and higher quiescent current is acceptable. |
| AP63201WS-18 | Fixed 1.8 V output, 2.5 MHz switching, 600 mA rating, 6-pin SOT-563 package; 25 µA quiescent current in PFM mode. | Through-hole-compatible SOT-563 footprint; lower switching frequency increases inductor size requirement. | Select when legacy SMT process supports SOT-563 or when thermal derating margin exceeds DSBGA capability. |
Compared with TPS62231DRYR and AP63201WS-18, LM3677LEE-1.8/NOPB offers the smallest PCB footprint (1.0 mm²), lowest PFM quiescent current (16 µA), and integrated soft-start sequencing-making it optimal for space-constrained, battery-sensitive mobile applications where rapid, controlled startup is critical.
Availability
LM3677LEE-1.8/NOPB is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, portable media players, and WLAN modules requiring stable component supply with consistent parametric performance and long-term lifecycle support.
Supply support for LM3677LEE-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 technologies for industrial, automotive, and consumer markets.
The LM3677 series was designed specifically for ultra-low-voltage, high-efficiency power conversion in portable electronics-emphasizing minimal solution size, adaptive efficiency modes, and robust protection for single-cell Li-Ion systems.
FAQ
What is the recommended input capacitor for LM3677LEE-1.8/NOPB?
A 4.7 µF, 6.3 V X5R/X7R ceramic capacitor placed adjacent to the VIN pin is recommended for LM3677LEE-1.8/NOPB. This value meets minimum requirements (2.2 µF at 3 V DC bias) and provides low ESR to suppress input voltage spikes generated by the 3 MHz switching action. Larger values improve filtering but require verification of DC bias derating at operating voltage.
Does LM3677LEE-1.8/NOPB require external feedback resistors?
No, LM3677LEE-1.8/NOPB does not require external feedback resistors. It is a fixed-output variant with internal resistor divider setting VOUT = 1.8 V. The FB pin is internally connected to the 0.5 V reference and must be left unconnected per datasheet guidance-no external components are needed on this pin.
What is the thermal resistance (θJA) of LM3677LEE-1.8/NOPB in its DSBGA package?
The junction-to-ambient thermal resistance (θJA) of LM3677LEE-1.8/NOPB in the 5-bump DSBGA package is 117 °C/W when mounted on a standard 4-layer JEDEC test board. This value assumes proper thermal pad soldering and PCB copper pour; actual θJA will improve with enhanced thermal vias and ground plane area beneath the package.
Can LM3677LEE-1.8/NOPB operate from a 2.5 V input?
No, LM3677LEE-1.8/NOPB cannot operate reliably from a 2.5 V input. Its absolute minimum input voltage is 2.7 V per the Operating Ratings table. Below 2.7 V, undervoltage lockout engages and the device remains disabled-even if EN is asserted-ensuring stable startup and preventing erratic regulation.
How does the soft-start function work in LM3677LEE-1.8/NOPB?
The LM3677LEE-1.8/NOPB implements soft-start by progressively increasing the internal switch current limit in four discrete steps: 200 mA → 400 mA → 600 mA → 1220 mA (typical). This occurs only when EN transitions high after VIN reaches 2.7 V, limiting inrush current into the output capacitor and preventing output overshoot or input rail sag during power-up.
LM3677LEE-1.8/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):
- 1.8V
- 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-1.8/NOPB FAQ
1.How can I place an order for LM3677LEE-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3677LEE-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 LM3677LEE-1.8/NOPB reliable?
The price and inventory of LM3677LEE-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 LM3677LEE-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM3677LEE-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3677LEE-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3677LEE-1.8/NOPB?
LM3677LEE-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3677LEE-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 LM3677LEE-1.8/NOPB?
For technical support, including LM3677LEE-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3677LEE-1.8/NOPB requirements.
6.How does Aetrix verify that LM3677LEE-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3677LEE-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 LM3677LEE-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM3677LEE-1.8/NOPB?
All LM3677LEE-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3677LEE-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 LM3677LEE-1.8/NOPB part is unused and in its original packaging.
Return procedure for LM3677LEE-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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