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Texas Instruments LM3677LEE-1.2/NOPB
- Part No.:
- LM3677LEE-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-UFDFN
- Datasheet:
-
LM3677LEE-1.2/NOPB.pdf
- Description:
- IC REG BUCK 1.2V 600MA 6USON
- Quantity:
- Payment:
- Shipping:
Inventory:230
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Product details
Overview
LM3677LEE-1.2/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 5.0 V input range for 1.2 V output). It delivers fixed 1.2 V output with ±2.5% regulation accuracy, 16 µA typical quiescent current in PFM mode, and integrates internal PFET/NFET switches with 350 mΩ/150 mΩ RDS(ON). It serves as the primary core voltage regulator in mobile phone baseband processors.
For engineers reviewing the LM3677LEE-1.2/NOPB datasheet, LM3677LEE-1.2/NOPB pinout, LM3677LEE-1.2/NOPB application, or LM3677LEE-1.2/NOPB equivalent, key selection considerations include its 5-bump DSBGA package footprint, automatic PFM/PWM mode transition at ~42 mA (VIN = 3.6 V), 0.01 µA shutdown current, and requirement for only three external passive components (1.0 µH inductor, 4.7 µF CIN, 10 µF COUT).
Technical Context
The LM3677LEE-1.2/NOPB employs voltage-mode PWM control with input voltage feed-forward to maintain tight line regulation across its 2.7–5.0 V input range. Its internal 0.5 V reference feeds an error amplifier that compares FB voltage against this threshold to modulate PFET on-time.
It features dual-mode operation: fixed-frequency 3 MHz PWM mode (80–600 mA load) for low-noise performance and hysteretic PFM mode (<80 mA) with 16 µA IQ to maximize battery life. Protection includes cycle-by-cycle current limiting (1220 mA typ.), thermal shutdown (150°C), and undervoltage lockout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V ±2.5% - meets core logic rail requirements for ARM-based baseband ICs. |
| Input Voltage Range | 2.7 V to 5.0 V - derated from standard 2.7–5.5 V to ensure stability at 1.2 V output. |
| Max Output Current | 600 mA - supports peak current demands of application processors during burst operation. |
| Switching Frequency | 3 MHz (typ.) - enables use of sub-1 mm height 1.0 µH shielded inductors and compact 0603 ceramic capacitors. |
| Quiescent Current | 16 µA (typ., PFM mode) - extends standby battery life in always-on mobile subsystems. |
| Shutdown Current | 0.01 µA (typ.) - eliminates parasitic drain during deep sleep or power-off states. |
| RDS(ON) (PFET/NFET) | 350 / 150 mΩ - minimizes conduction loss at 600 mA, enabling >90% efficiency at mid-load. |
Pinout & Package
LM3677LEE-1.2/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 solder pads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (A1) | Power input | Connects to input filter capacitor; must be decoupled within 2 mm to minimize high-frequency switching noise injection. |
| SW (B2, A3) | Switching node | Drives external inductor; requires short, low-inductance trace to reduce EMI and voltage overshoot. |
| EN (C1) | Enable control | Active-high logic input; <0.4 V disables device, >1.0 V enables; must not float-tie to GND or host GPIO. |
| FB (C3) | Feedback sense | Direct connection to output capacitor; forms resistive divider only in adjustable versions-bypassed internally for fixed 1.2 V output. |
| GND (A3) | Power ground | Primary return path for PFET/NFET currents; requires solid thermal pad connection to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode, reducing BOM count and improving efficiency by 8–12% vs. asynchronous buck at 1.2 V output. |
| Automatic PFM/PWM mode switching | Transitions seamlessly at ~42 mA (VIN = 3.6 V), maintaining >85% efficiency from 1 mA to 600 mA without manual control. |
| Internal soft-start | Ramps switch current limit in 200/400/600/1220 mA steps, limiting inrush current to prevent input rail collapse during power-up. |
| Thermal and current protection | Shuts down at 150°C junction temperature and limits peak switch current to 1220 mA, preventing damage during output short or overload. |
| Ultra-small solution size | Requires only 1.0 µH inductor + 4.7 µF CIN + 10 µF COUT, achieving total footprint <20 mm² - ideal for space-constrained mobile PCBs. |
Applications
| Mobile Phone Baseband Power | Portable Media Player Core Rail |
|---|---|
Use Scenario: Powers ARM9/ARM11 application processor core in GSM/WCDMA smartphones during active and idle modes. IC Role / Device Role / Timing Role: Primary DC-DC regulator delivering stable 1.2 V core voltage with fast transient response to CPU frequency scaling events. Use Value: 3 MHz switching enables <10 µs load transient recovery; 16 µA PFM current extends standby time beyond 72 hours on 1000 mAh battery. | Use Scenario: Supplies core logic voltage to audio DSP and NAND controller in flash-based MP3 players. IC Role / Device Role / Timing Role: Fixed-output buck converter providing low-noise 1.2 V rail independent of battery voltage decay from 4.2 V to 3.0 V. Use Value: Input derating to 2.7–5.0 V ensures ±2.5% output accuracy across full battery discharge curve, preventing DSP reset. |
| Digital Still Camera Image Processor | Bluetooth Headset SoC Supply |
Use Scenario: Regulates voltage for CMOS image sensor interface and JPEG encoder ASIC during photo capture bursts. IC Role / Device Role / Timing Role: High-current (600 mA peak) step-down converter supporting short-duration, high-power imaging workloads. Use Value: 1220 mA current limit prevents foldback during 500 mA sensor startup surge; thermal shutdown protects against enclosure overheating. | Use Scenario: Provides clean 1.2 V supply to Bluetooth 4.0 LE radio SoC in compact earbud form factor. IC Role / Device Role / Timing Role: Ultra-low-IQ DC-DC converter enabling multi-week standby on coin-cell–equivalent energy budget. Use Value: 0.01 µA shutdown current reduces annual self-discharge to <1% of battery capacity, critical for maintenance-free wearables. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 3 MHz, 600 mA, fixed 1.2 V; 12 µA IQ; 2.05–6.0 V input; 6-pin WSON package (2.0 × 2.0 mm). | Larger footprint; wider input range allows direct use with 2-cell LiPo; lower IQ benefits ultra-long-life IoT sensors. | Select when board space permits larger package and input voltage may exceed 5.0 V. |
| AP63202WU-12 | 2.5 MHz, 2 A, fixed 1.2 V; 22 µA IQ; 2.5–5.5 V input; 8-pin WLCSP (1.5 × 1.5 mm). | Higher current rating and larger package; no input derating required for 1.2 V output; lacks PFM mode. | Select when future-proofing for higher current loads or when PWM-only operation simplifies EMI filtering. |
Compared with TPS62231DRYR and AP63202WU-12, the LM3677LEE-1.2/NOPB offers the smallest footprint (1.0 mm²) and lowest shutdown current (0.01 µA), making it optimal for ultra-compact, battery-critical mobile designs where input stays ≤5.0 V.
Availability
LM3677LEE-1.2/NOPB is available at Aetrix Electronics and suitable for mobile phone baseband power, portable media player core rails, digital still camera image processors, and Bluetooth headset SoC supply requiring stable component supply across high-mix production runs.
Supply support for LM3677LEE-1.2/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 and embedded processing technologies, with decades of expertise in power management IC design.
The LM3677 series was developed specifically for ultra-low-voltage, high-efficiency power conversion in space-constrained portable electronics, targeting core voltage regulation for application processors and digital signal processors in battery-powered devices.
FAQ
What is the maximum input voltage for LM3677LEE-1.2/NOPB?
The LM3677LEE-1.2/NOPB has a derated input voltage range of 2.7 V to 5.0 V - not the full 2.7–5.5 V specified for other LM3677 variants - to guarantee ±2.5% output regulation accuracy and stable operation at its fixed 1.2 V output. Exceeding 5.0 V may cause overvoltage stress on internal circuitry and degrade long-term reliability.
Does LM3677LEE-1.2/NOPB require external feedback resistors?
No. The LM3677LEE-1.2/NOPB is a fixed-output version with internal resistor divider network tied to its 0.5 V reference, so the FB pin is internally connected and does not require external resistors. This simplifies layout and eliminates resistor tolerance errors affecting output accuracy - a key advantage over adjustable variants like LM3677SD-1.2/NOPB.
How does the PFM/PWM transition work in LM3677LEE-1.2/NOPB?
The LM3677LEE-1.2/NOPB automatically transitions from PWM to PFM mode when load current drops below ~42 mA (at VIN = 3.6 V), reducing quiescent current from ~35 µA to 16 µA. It switches back to PWM when load rises above ~115 mA. This hysteresis prevents mode oscillation and maintains >85% efficiency across the full 1–600 mA load range without external control signals.
What package type is used for LM3677LEE-1.2/NOPB?
The LM3677LEE-1.2/NOPB uses a 5-bump DSBGA (Die Size Ball Grid Array) package designated YZR0005, measuring 1.0 mm × 1.0 mm × 0.55 mm with 0.5 mm pitch. It is lead-free (NOPB suffix) and requires reflow soldering per JEDEC J-STD-020; the bottom-side solder balls demand precise stencil aperture design for reliable assembly.
Can LM3677LEE-1.2/NOPB drive a 600 mA load continuously?
Yes, the LM3677LEE-1.2/NOPB is rated for up to 600 mA continuous output current under conditions meeting its thermal limits: ambient temperature ≤85°C, proper PCB copper pour on GND pad, and use of recommended 1.0 µH inductor with ≥1375 mA saturation current. At 600 mA and VIN = 3.6 V, junction temperature rise is ~45°C above ambient on a 4-layer board, staying well below the 125°C max rating.
LM3677LEE-1.2/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):
- 1.2V
- 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-1.2/NOPB FAQ
1.How can I place an order for LM3677LEE-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3677LEE-1.2/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-1.2/NOPB reliable?
The price and inventory of LM3677LEE-1.2/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-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM3677LEE-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3677LEE-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3677LEE-1.2/NOPB?
LM3677LEE-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3677LEE-1.2/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-1.2/NOPB?
For technical support, including LM3677LEE-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3677LEE-1.2/NOPB requirements.
6.How does Aetrix verify that LM3677LEE-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3677LEE-1.2/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-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM3677LEE-1.2/NOPB?
All LM3677LEE-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3677LEE-1.2/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-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM3677LEE-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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