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Texas Instruments LM3677TL-ADJ/NOPB
- Part No.:
- LM3677TL-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-WFBGA, DSBGA
- Datasheet:
-
LM3677TL-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 600MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:490
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Product details
Overview
LM3677TL-ADJ/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 adjustable output voltage (1.2 V to 3.3 V) with 0.5 V internal reference, 16 µA typical quiescent current in PFM mode, and integrated PFET/NFET switches enabling >90% efficiency at moderate loads. It serves as the primary power supply for core logic rails in mobile phones and portable instrumentation.
For engineers reviewing the LM3677TL-ADJ/NOPB datasheet, LM3677TL-ADJ/NOPB pinout, LM3677TL-ADJ/NOPB application, or LM3677TL-ADJ/NOPB equivalent, key selection criteria include its 3 MHz fixed-frequency PWM/automatic PFM switching capability, 5-bump DSBGA package footprint, 0.01 µA shutdown current, and minimal external component count (1 inductor + 2 ceramic capacitors).
Technical Context
The LM3677TL-ADJ/NOPB employs voltage-mode control with input voltage feed-forward to maintain tight line regulation across its 2.7 V–5.5 V input range. Its dual-mode operation-PWM above ~80 mA load and hysteretic PFM below-enables stable regulation while minimizing quiescent current.
Internal synchronous rectification uses a 350 mΩ PFET and 150 mΩ NFET to eliminate external diode losses. Soft-start limits inrush current via stepped current-limit ramping (200 mA → 400 mA → 600 mA → 1220 mA), and thermal shutdown engages at 150°C (typ.) with hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports full discharge curve of single Li-Ion battery without derating (except for VOUT ≤1.2 V, where VIN max = 5.0 V). |
| Output Current | 600 mA maximum - sustained delivery across full input range and ambient temperature (−30°C to +85°C). |
| Switching Frequency | 3 MHz (typ.), 2.5–3.5 MHz (min–max) - enables use of sub-1 mm height, 1.0 µH inductors and 0603/0805 ceramic capacitors. |
| Quiescent Current | 16 µA (typ.) in PFM mode - extends battery life during standby and light-load operation in portable devices. |
| Shutdown Current | 0.01 µA (typ.) - minimizes battery drain when system is powered off via EN pin control. |
| Feedback Reference | 0.5 V internal bandgap - sets output voltage via external resistor divider (VOUT = 0.5 V × (1 + R1/R2)), supporting 1.2–3.3 V adjustment. |
| Current Limit | 1220 mA (typ.) open-loop peak switch current - provides robust overload protection without external sensing. |
Pinout & Package
LM3677TL-ADJ/NOPB is housed in a lead-free 5-bump DSBGA package (YZR0005), measuring 1.0 mm × 1.0 mm × 0.5 mm, with 0.5 mm pitch and bottom-side thermal pad for enhanced thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (A1) | Power input | Connects to input filter capacitor; accepts 2.7–5.5 V; absolute max = 6.0 V. |
| SW (B2, A3) | Switching node | Drives external inductor; connects internally to PFET drain and NFET source; high dv/dt node requiring careful layout. |
| FB (C3) | Feedback input | Analog input referenced to GND; connects directly to output capacitor; sets regulated VOUT via resistor divider. |
| EN (C1) | Enable control | Logic-level input: <0.4 V = shutdown (0.01 µA IQ), >1.0 V = active; must not be left floating. |
| GND (A3) | Ground reference | Primary return path for power and signal; connects to thermal pad; requires low-impedance PCB plane. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic PFM/PWM mode switching | Transitions seamlessly between high-efficiency PFM (16 µA IQ) at light loads and low-noise 3 MHz PWM at >80 mA, eliminating manual mode selection. |
| Integrated synchronous rectification | On-chip PFET (350 mΩ) and NFET (150 mΩ) replace external Schottky diode, improving efficiency by ~8–12% at 1.8 V/300 mA vs. asynchronous designs. |
| Minimal external components | Only three passive parts required: 1.0 µH inductor + 4.7 µF input + 10 µF output ceramic capacitors - reduces solution size to <20 mm². |
| Internal soft-start | Gradually ramps switch current limit (200 → 400 → 600 → 1220 mA) during enable, limiting inrush into output capacitance and preventing input rail sag. |
| Comprehensive protection | Includes cycle-by-cycle current limiting (1220 mA typ.), thermal shutdown (150°C trip), undervoltage lockout (<2.7 V disable), and short-circuit recovery. |
Applications
| Mobile Phone Core Rail | Portable Instrument ADC Supply |
|---|---|
Use Scenario: Powering ARM Cortex-M4 core and SRAM at 1.2 V from a 3.6 V Li-Ion battery during active and sleep modes. IC Role / Device Role / Timing Role: Primary buck regulator delivering tightly regulated, low-noise DC supply with fast transient response to CPU load steps. Use Value: 3 MHz switching avoids AM radio band interference; 16 µA PFM IQ extends standby time; 0.01 µA shutdown prevents battery depletion during storage. |
Use Scenario: Generating clean 2.5 V bias for 16-bit SAR ADC in handheld multimeter with battery-only operation. IC Role / Device Role / Timing Role: Precision voltage source with low output ripple (<10 mVpp) and minimal load regulation error (±2.5%) across 0–600 mA. Use Value: Internal 0.5 V reference and resistor-programmable output ensure accurate scaling; synchronous FETs reduce thermal drift vs. diode-based solutions. |
| W-LAN Baseband Processor | Digital Still Camera Image Sensor Bias |
Use Scenario: Supplying 1.8 V to Wi-Fi SoC baseband logic under bursty traffic loads with rapid 10–90% current transients. IC Role / Device Role / Timing Role: High-bandwidth power stage with <10 µs load transient recovery (PFM→PWM transition at ~115 mA @ VIN=3.6 V). Use Value: Automatic mode switching maintains >85% efficiency across 1 mA–600 mA; SW pin waveform optimized for low EMI layout. |
Use Scenario: Providing stable 3.3 V analog bias to CMOS image sensor during exposure and readout cycles. IC Role / Device Role / Timing Role: Low-noise, low-drift DC-DC source with thermal shutdown protecting sensor during extended operation. Use Value: 125°C max junction rating and 85°C/W θJA allow continuous 600 mA delivery on standard 4-layer PCB; DSBGA footprint saves board space. |
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 | 3 MHz, 600 mA, 0.6 V reference, 17 µA IQ, 6-pin USON only - no DSBGA option; slightly higher RDSON (PFET 400 mΩ). | Same mobile/industrial use cases but lacks DSBGA package; requires different PCB footprint and thermal pad layout. | Select if USON packaging is preferred and 0.6 V reference simplifies feedback divider design. |
| TPS62740DSSR | 3 MHz, 300 mA, 1.8 µA IQ (ultra-low-power PFM), 0.5 V reference, 6-pin WSON - lower current rating and no DSBGA. | Better suited for always-on sensor nodes than high-current processors; insufficient for 600 mA loads. | Choose only for sub-300 mA applications where <2 µA IQ outweighs current capability loss. |
Compared with LM3677TL-ADJ/NOPB, TPS62231DRYR offers identical performance in USON but forfeits the ultra-compact DSBGA option, while TPS62740DSSR trades half the output current for dramatically lower quiescent current - making LM3677TL-ADJ/NOPB the optimal balance of size, current, and efficiency for space-constrained 600 mA Li-Ion systems.
Availability
LM3677TL-ADJ/NOPB is available at Aetrix Electronics and suitable for mobile phone power management, portable instrumentation, W-LAN baseband supplies, and digital still camera subsystems requiring stable component supply across production lifecycles.
Supply support for LM3677TL-ADJ/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 power management ICs, with decades of expertise in high-efficiency DC-DC conversion for battery-powered systems.
The LM3677 product line was designed specifically for ultra-low-voltage, space-constrained portable electronics - delivering high current density, minimal external components, and intelligent power-saving modes from a single Li-Ion cell.
FAQ
What is the minimum input voltage required for stable operation of the LM3677TL-ADJ/NOPB?
The LM3677TL-ADJ/NOPB requires a minimum input voltage of 2.7 V for stable regulation across all output voltages. Below this threshold, undervoltage lockout disables the device to prevent erratic behavior. For output voltages ≤1.2 V, the maximum input voltage must be limited to 5.0 V per datasheet specification to maintain accuracy and reliability.
How does the LM3677TL-ADJ/NOPB achieve automatic PFM/PWM mode switching?
The LM3677TL-ADJ/NOPB monitors inductor current zero-crossing and peak PFET current to autonomously transition between modes. When load drops below ~42 mA (at VIN = 3.6 V), it enters PFM mode with 16 µA quiescent current; above ~115 mA, it reverts to fixed 3 MHz PWM for low-noise operation. No external control signals are needed - the decision logic is fully internal.
Can the LM3677TL-ADJ/NOPB be used with an output voltage lower than 1.2 V?
No - the LM3677TL-ADJ/NOPB is specified for adjustable output voltages from 1.2 V to 3.3 V only. Attempting to set VOUT below 1.2 V violates the device's operating conditions, as the internal 0.5 V reference and feedback amplifier architecture are not characterized or guaranteed for such configurations. Use alternate regulators like the TPS62130 for sub-1.2 V outputs.
What is the recommended inductor value and saturation current rating for the LM3677TL-ADJ/NOPB?
Texas Instruments recommends a 1.0 µH shielded inductor with ≥1375 mA saturation current rating (e.g., Murata LQM2HP 1R0 or Taiyo Yuden BRL2518T1R0M). This ensures operation within current limit specifications across temperature and input voltage extremes, while minimizing radiated noise. DCR should be ≤100 mΩ for optimal efficiency.
Does the LM3677TL-ADJ/NOPB require an external compensation network?
No - the LM3677TL-ADJ/NOPB features internal frequency compensation optimized for standard 1.0 µH inductors and 10 µF ceramic output capacitors. No external compensation components are needed, simplifying design and reducing bill-of-materials cost. Stability is guaranteed across the full 1.2–3.3 V output range with recommended external parts.
LM3677TL-ADJ/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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 3.3V
- 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:
- 5-DSBGA (1.41x1.08)
LM3677TL-ADJ/NOPB FAQ
1.How can I place an order for LM3677TL-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3677TL-ADJ/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 LM3677TL-ADJ/NOPB reliable?
The price and inventory of LM3677TL-ADJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3677TL-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM3677TL-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3677TL-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3677TL-ADJ/NOPB?
LM3677TL-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3677TL-ADJ/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 LM3677TL-ADJ/NOPB?
For technical support, including LM3677TL-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3677TL-ADJ/NOPB requirements.
6.How does Aetrix verify that LM3677TL-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3677TL-ADJ/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 LM3677TL-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM3677TL-ADJ/NOPB?
All LM3677TL-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3677TL-ADJ/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 LM3677TL-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM3677TL-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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