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Texas Instruments LM3691TL-1.8/NOPB
- Part No.:
- LM3691TL-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WFBGA, DSBGA
- Datasheet:
-
LM3691TL-1.8/NOPB.pdf
- Description:
- IC REG BUCK 1.8V 1A 6DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:989
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Product details
Overview
LM3691TL-1.8/NOPB from Texas Instruments is a high-accuracy, miniature 1-A synchronous step-down DC-DC converter optimized for portable applications powered by single Li-Ion or 3-cell NiMH/NiCd batteries. It delivers a fixed 1.8-V output with ±1% DC precision, operates from 2.3 V to 5.5 V input, and supports automatic ECO/PWM mode switching-enabling efficient power delivery in mobile phones and MP3 players.
For engineers reviewing the LM3691TL-1.8/NOPB datasheet, LM3691TL-1.8/NOPB pinout, LM3691TL-1.8/NOPB application, or LM3691TL-1.8/NOPB equivalent, key selection considerations include its 4-MHz switching frequency, 64-μA typical quiescent current in ECO mode, 1-A maximum load capability, and DSBGA-6 package compatibility with space-constrained PCB layouts.
Technical Context
The LM3691TL-1.8/NOPB implements voltage-mode control with input-voltage feed-forward for stable line regulation across its 2.3–5.5 V input range. Its synchronous rectification uses internal PFET and NFET switches, enabling high efficiency at low output voltages like 1.8 V without external diodes.
It features dual operational modes: forced PWM (MODE = high) ensures constant 4-MHz switching for low-noise applications, while ECO mode (MODE = low) dynamically gates switching to reduce quiescent current to 64 μA at light loads-extending battery life in standby states of handheld devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V with ±1% DC accuracy over temperature and load-ensures stable core logic supply for processors and memory in portable systems. |
| Input Voltage Range | 2.3 V to 5.5 V-supports direct operation from depleted Li-Ion cells (down to 2.3 V) and full-range 3-cell NiMH/NiCd packs. |
| Max Output Current | 1000 mA-sufficient to power baseband processors, display drivers, or RF modules in compact handheld devices. |
| Switching Frequency | 4 MHz (typical, PWM mode)-enables use of ultra-small 1-μH inductors and minimizes solution footprint under 15 mm². |
| Quiescent Current | 64 μA (typical, ECO mode)-reduces no-load battery drain, critical for long-duration sleep modes in mobile phones. |
| Protection Features | Current overload limit (1500 mA typ), thermal shutdown (150°C), and undervoltage lockout (2.1 V falling)-prevents damage during fault conditions without external circuitry. |
| Soft-Start Rate | 30 mV/μs (at VOUT = 1.8 V)-controls inrush current during power-up, avoiding input rail collapse in battery-powered systems. |
Pinout & Package
The LM3691TL-1.8/NOPB is housed in a 6-pin DSBGA package (1.59 mm × 1.295 mm, 0.5-mm pitch) with bottom-side solder balls. Thermal performance is characterized by RθJA = 85°C/W, requiring minimal copper area for thermal management in thin-profile designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (EN) | Enable input | Active-high digital control: device enabled when >1.2 V; shutdown draws only 0.03 μA-ideal for system-level power sequencing. |
| A2 (VIN) | Power input | Primary input supply connection (2.3–5.5 V); requires local 4.7-μF ceramic capacitor to suppress high-frequency switching noise. |
| B1 (MODE) | Mode select | Digital input: high = forced PWM (constant 4-MHz), low = auto ECO/PWM switching-enables dynamic efficiency optimization. |
| B2 (SW) | Switch node | Internal PFET drain / NFET source connection; drives external 1-μH inductor-requires tight layout to minimize EMI and voltage spikes. |
| C1 (FB) | Feedback input | Analog input tied directly to output capacitor; senses regulated 1.8 V via internal 0.6-V reference and resistor divider (not needed for fixed-output variant). |
| C2 (GND) | Ground reference | Power and analog ground return; must be connected to low-impedance PCB plane to ensure stability and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic ECO/PWM mode transition | Switches seamlessly at ~50 mA load threshold-maintains >85% efficiency from 1 mA to 1 A without firmware intervention. |
| Synchronous rectification | Integrated PFET/NFET pair eliminates external Schottky diode-reduces conduction loss and improves efficiency by 8–12% at 1.8 V output. |
| Ultra-small solution size | Only three external components required (1-μH inductor, 4.7-μF CIN, 4.7-μF COUT)-achieves total footprint <15 mm² for space-critical wearables and smartphones. |
| ±1% output voltage accuracy | Guaranteed over –30°C to +85°C ambient and full load range-meets tight tolerance requirements of modern SoCs and DDR memory I/O rails. |
| Thermal and overload protection | Self-shutdown at 150°C junction temperature; current limit clamps at 1500 mA-enables robust operation in sealed enclosures without heatsinking. |
Applications
| Mobile Phone Power Rail | MP3 Player Core Supply |
|---|---|
Use Scenario: Powers application processor I/O and memory interface in slim smartphone designs using single-cell Li-Ion battery. IC Role / Device Role / Timing Role: Primary 1.8-V buck regulator delivering up to 1 A with fast transient response to CPU burst loads. Use Value: ECO mode extends standby time by reducing IQ to 64 μA; 4-MHz switching enables use of 1-μH inductor, saving board area vs. lower-frequency alternatives. | Use Scenario: Supplies 1.8-V core voltage to audio codec and flash memory controller in portable music players. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter providing stable, low-noise supply independent of battery voltage sag. Use Value: ±1% output accuracy ensures consistent audio DAC performance; thermal shutdown prevents overheating during extended playback. |
| Hand-Held Radio Baseband | Portable HDD Interface |
Use Scenario: Powers baseband IC and RF front-end bias in ruggedized two-way radios operating from 3-cell NiMH packs. IC Role / Device Role / Timing Role: High-efficiency step-down regulator supporting wide input range (2.3–4.5 V) as battery discharges. Use Value: 2.3-V minimum input allows full utilization of NiMH capacity; MODE pin enables forced PWM during transmission bursts for predictable ripple. | Use Scenario: Generates 1.8-V supply for SATA or PATA interface logic in portable hard disk drives. IC Role / Device Role / Timing Role: Compact, thermally robust buck converter meeting tight height constraints (<0.6 mm) of 2.5-inch HDD assemblies. Use Value: DSBGA-6 package fits within narrow drive edge zones; current limit protects against short-circuit faults during hot-plug events. |
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, 4-MHz switching, 1-A rating-but uses WSON-6 (2 mm × 2 mm) instead of DSBGA-6; higher RθJA (120°C/W). | Requires larger PCB footprint and more thermal copper; lacks automatic ECO mode-uses forced PWM only. | Select when WSON package is preferred for reflow compatibility or when constant-frequency operation is mandatory for EMI filtering. |
| AP63202WU-18 | 1.8-V fixed output, 2-A rating, 2.2-MHz switching, SOT-563 package; includes enable and power-good pins not present on LM3691TL-1.8/NOPB. | Higher current headroom but larger solution size; no ECO mode-uses pulse-frequency modulation (PFM) for light-load efficiency. | Select when future-proofing for higher load growth or when power-good signaling is required for system sequencing. |
Compared with TPS62231DRYR and AP63202WU-18, the LM3691TL-1.8/NOPB offers superior light-load efficiency via true ECO mode, smallest package footprint (DSBGA-6), and tighter output voltage accuracy (±1%), making it optimal for ultra-portable devices where battery life and board area are critical.
Availability
LM3691TL-1.8/NOPB is available at Aetrix Electronics and suitable for mobile phones, MP3 players, hand-held radios, and portable hard disk drives requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM3691TL-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 specializing in analog and embedded processing technologies, with leadership in power management ICs for portable and industrial applications.
The LM3691 product line was designed specifically for ultra-low-voltage, high-efficiency power conversion in space-constrained portable electronics-emphasizing minimal external component count, adaptive efficiency modes, and robust protection in battery-operated environments.
FAQ
What is the recommended input capacitor for LM3691TL-1.8/NOPB?
A 4.7-μF, 6.3-V X7R/X5R ceramic capacitor placed adjacent to the VIN and GND pins is recommended for LM3691TL-1.8/NOPB. This value ensures adequate input filtering for 4-MHz switching and meets the minimum 2.2-μF requirement across temperature and DC bias. Larger capacitance may improve ripple suppression but is not required for basic operation.
Does LM3691TL-1.8/NOPB require an external feedback resistor divider?
No, LM3691TL-1.8/NOPB does not require an external feedback resistor divider. It is a fixed-output variant with internal resistor network set to 1.8 V; the FB pin connects directly to the output capacitor for regulation. Only adjustable-output versions (e.g., LM3691TL-ADJ) need external resistors.
What is the shutdown current of LM3691TL-1.8/NOPB?
The shutdown current of LM3691TL-1.8/NOPB is 0.03 μA (typical) when the EN pin is pulled below 0.4 V. This ultra-low quiescent draw preserves battery charge during system sleep or power-off states, supporting multi-week standby in always-on portable devices.
Can LM3691TL-1.8/NOPB operate with a 2.3-V input supply?
Yes, LM3691TL-1.8/NOPB is fully specified to operate down to 2.3 V input-enabling complete discharge of single Li-Ion cells and 3-cell NiMH batteries. At 2.3 V input and 1.8 V output, it maintains >80% efficiency at 100 mA load in ECO mode, per Figure 12 in the datasheet.
What protection features are integrated into LM3691TL-1.8/NOPB?
LM3691TL-1.8/NOPB integrates current overload protection (1500 mA typical trip), thermal shutdown (engages at ~150°C junction temperature), undervoltage lockout (2.1 V falling threshold), and soft-start (30 mV/μs ramp). These functions operate autonomously without external components, enhancing system reliability in portable applications.
LM3691TL-1.8/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-WFBGA, DSBGA
- 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):
- 2.3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DSBGA (1.5x1.3)
LM3691TL-1.8/NOPB FAQ
1.How can I place an order for LM3691TL-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3691TL-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 LM3691TL-1.8/NOPB reliable?
The price and inventory of LM3691TL-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 LM3691TL-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM3691TL-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3691TL-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3691TL-1.8/NOPB?
LM3691TL-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3691TL-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 LM3691TL-1.8/NOPB?
For technical support, including LM3691TL-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3691TL-1.8/NOPB requirements.
6.How does Aetrix verify that LM3691TL-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3691TL-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 LM3691TL-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM3691TL-1.8/NOPB?
All LM3691TL-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3691TL-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 LM3691TL-1.8/NOPB part is unused and in its original packaging.
Return procedure for LM3691TL-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3691TL-1.8/NOPB Tags
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