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Texas Instruments LM3691TLX-3.3/NOPB
- Part No.:
- LM3691TLX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WFBGA, DSBGA
- Datasheet:
-
LM3691TLX-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 1A 6DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,011
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Product details
Overview
LM3691TLX-3.3/NOPB from Texas Instruments is a high-accuracy, miniature 1-A synchronous step-down DC-DC converter optimized for portable Li-Ion/NiMH-powered systems. It delivers a fixed 3.3 V output with ±1% DC precision, operates from 2.3 V to 5.5 V input, supports automatic ECO/PWM mode switching, and achieves up to 90% peak efficiency at 100 mA–1 A loads - enabling compact power rails in mobile phones and MP3 players.
For engineers reviewing the LM3691TLX-3.3/NOPB datasheet, LM3691TLX-3.3/NOPB pinout, LM3691TLX-3.3/NOPB application, or LM3691TLX-3.3/NOPB equivalent, key selection criteria include its 4-MHz switching frequency, 64-μA ECO-mode quiescent current, DSBGA-6 package footprint (<15 mm² solution size), and integrated thermal/overcurrent protection - all critical for battery-life-sensitive, space-constrained designs.
Technical Context
The LM3691TLX-3.3/NOPB uses voltage-mode control with input-voltage feed-forward to maintain tight line and load regulation across its 2.3–5.5 V input range. Its synchronous rectification employs an internal PFET high-side switch (160–250 mΩ RDS(ON)) and NFET low-side switch (115–180 mΩ RDS(ON)) to minimize conduction loss at 3.3 V output.
It implements dual operational modes: forced PWM (MODE = high) for constant-frequency operation, and ECO mode (MODE = low) that dynamically gates switching to reduce IQ to 64 μA typical under light loads (<50 mA), increasing output voltage by ~30 mV to compensate for sleep-state settling - improving light-load efficiency without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V with ±1% DC accuracy - ensures stable logic rail compliance for 3.3-V I/O interfaces and microcontrollers. |
| Input Voltage Range | 2.3 V to 5.5 V - supports single-cell Li-Ion (2.7–4.2 V), 3-cell NiMH/NiCd (2.4–4.5 V), and USB-powered systems. |
| Max Output Current | 1000 mA - sufficient to power baseband processors, RF transceivers, or display drivers in handheld devices. |
| Switching Frequency | 4 MHz (3.6–4.4 MHz range) - enables use of small 1-μH inductors and reduces output ripple without requiring large LC filters. |
| Quiescent Current | 64 μA typical in ECO mode - extends battery runtime during standby/sleep states in portable electronics. |
| Protection Features | Current limit (1250–1700 mA), thermal shutdown (150°C trip), UVLO (2.1–2.29 V), and soft-start (30 mV/μs ramp) - prevent damage during fault conditions and inrush. |
| Package | 6-pin DSBGA (1.59 mm × 1.295 mm) - ultra-compact footprint compatible with fine-pitch PCB assembly and minimal board area usage. |
Pinout & Package
LM3691TLX-3.3/NOPB is housed in a 6-pin DSBGA (YZR) package measuring 1.59 mm × 1.295 mm with bottom-side ball layout. The package supports high-density routing and requires standard reflow profiles per TI SMT guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (EN) | Enable input | Active-high digital control: >1.2 V enables operation; <0.4 V forces shutdown (0.03 μA ISHDN); must not float. |
| A2 (VIN) | Power input | Primary supply connection (2.3–5.5 V); requires local 4.7-μF ceramic decoupling capacitor to minimize input ripple and EMI. |
| B1 (MODE) | Mode select | Digital input: high (>1.2 V) forces PWM mode; low (<0.4 V) enables auto-switching between ECO and PWM based on load. |
| B2 (SW) | Switching node | Internal PFET/NFET connection point; drives external 1-μH inductor; requires short, low-inductance trace to minimize ringing and EMI. |
| C1 (FB) | Feedback input | Analog sense node tied directly to output capacitor; sets regulated 3.3 V via internal 0.75-V reference and resistor divider (not needed for fixed-output variants). |
| C2 (GND) | Ground reference | Power and signal ground return; must be connected to low-impedance PCB ground plane to ensure stability and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic ECO/PWM mode switching | Reduces quiescent current to 64 μA at light loads while maintaining regulation - extends battery life without firmware intervention. |
| Synchronous rectification | Integrated PFET/NFET switches eliminate external diode losses - improves efficiency by 5–10% vs. asynchronous buck at 3.3 V output. |
| 4-MHz fixed-frequency PWM | Enables use of tiny 1-μH inductors and 0603-size 4.7-μF ceramic capacitors - achieves full solution size under 15 mm². |
| ±1% output voltage accuracy | Ensures reliable operation of 3.3-V logic, ADC references, and interface circuits without post-regulation trimming. |
| Thermal and overload protection | Shuts down at 150°C junction temperature and limits peak switch current to 1500 mA - prevents catastrophic failure during shorts or overloads. |
Applications
| Mobile Phone Power Rail | MP3 Player Core Supply |
|---|---|
Use Scenario: Powers baseband processor I/O and camera sensor interface in slim smartphone designs with single-cell Li-Ion battery. IC Role / Device Role / Timing Role: Primary 3.3-V step-down regulator delivering up to 1 A with fast transient response to burst-mode processing loads. Use Value: 90% peak efficiency at 500 mA and 64-μA ECO-mode IQ extend talk time by >12% versus legacy 2-MHz converters. |
Use Scenario: Supplies 3.3-V audio codec and flash memory interface in portable music players operating from 3-cell NiMH. IC Role / Device Role / Timing Role: Fixed-output buck converter with soft-start and UVLO to prevent brownout resets during battery discharge. Use Value: 4-MHz switching eliminates audible coil whine and allows use of low-profile inductors - critical for thin form factors. |
| Hand-Held Radio RF Front-End | Portable HDD Controller Supply |
Use Scenario: Provides clean, low-noise 3.3-V bias to RF power amplifier and mixer stages in ruggedized two-way radios. IC Role / Device Role / Timing Role: High-PWM-mode-only regulator (MODE = high) ensuring constant 4-MHz switching for predictable EMI filtering. Use Value: Synchronous rectification and low RDS(ON) reduce thermal rise under 800-mA transmit bursts - avoids thermal throttling. |
Use Scenario: Generates 3.3-V supply for SATA controller and buffer memory in 2.5-inch portable hard disk drives. IC Role / Device Role / Timing Role: Compact, thermally robust buck converter supporting rapid spin-up current surges up to 1 A. Use Value: Integrated current limiting (1500 mA typ.) and thermal shutdown protect against motor stall-induced overloads. |
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 switching, 0.6-V to 5.5-V adjustable output, 600-mA max, 17-μA IQ in DCS-Control™ eco-mode | Requires external feedback resistors; lower max current; superior light-load efficiency but less headroom for 1-A peaks | Select when adjustable output or ultra-low IQ (<20 μA) is prioritized over 1-A capability and fixed 3.3-V simplicity. |
| AP63201-W5-7 | 2.5-MHz switching, 3.3-V fixed output, 2-A max, 30-μA IQ in PFM mode, WLCSP-6 package (1.5 × 1.5 mm) | Larger current capacity and smaller IQ, but wider package footprint and no MODE pin for forced PWM control | Select when future-proofing for higher-current derivatives or tighter IQ targets is required, accepting trade-offs in control flexibility. |
Compared with TPS62231DRYR and AP63201-W5-7, the LM3691TLX-3.3/NOPB uniquely balances 1-A capability, 4-MHz speed for miniaturization, fixed 3.3-V simplicity, and MODE-pin controllability - making it optimal for cost-sensitive, space-constrained portable designs where guaranteed 3.3-V rail stability is mandatory.
Availability
LM3691TLX-3.3/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 LM3691TLX-3.3/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 portable electronics.
The LM3691TLX-3.3/NOPB belongs to TI's portable power management portfolio, designed specifically to replace linear regulators and older buck converters in battery-powered handheld devices - emphasizing ultra-small size, high light-load efficiency, and seamless integration with Li-Ion/NiMH sources.
FAQ
What is the output voltage tolerance of the LM3691TLX-3.3/NOPB?
The LM3691TLX-3.3/NOPB provides a fixed 3.3 V output with ±1% DC accuracy over temperature (−30°C to +85°C) and line/load conditions. This specification is guaranteed by internal trimming and applies across its full 2.3–5.5 V input range and 0–1000 mA load range - ensuring compatibility with 3.3-V logic families and interface standards without external calibration.
Does the LM3691TLX-3.3/NOPB require external feedback resistors?
No, the LM3691TLX-3.3/NOPB is a factory-trimmed fixed-output variant - its 3.3 V regulation is achieved internally using a precision 0.75-V reference and dedicated resistor network. The FB pin is internally connected and must be left unconnected or tied directly to the output capacitor; no external resistors are needed or supported.
How does the MODE pin affect operation of the LM3691TLX-3.3/NOPB?
The MODE pin on the LM3691TLX-3.3/NOPB selects between two distinct operating modes: pulling MODE high (>1.2 V) forces continuous PWM operation regardless of load, while pulling MODE low (<0.4 V) enables automatic ECO/PWM mode switching - entering ECO below ~50 mA to reduce IQ to 64 μA and improve light-load efficiency.
What package type and dimensions does the LM3691TLX-3.3/NOPB use?
The LM3691TLX-3.3/NOPB is packaged in a 6-pin DSBGA (YZR) with body dimensions of 1.59 mm × 1.295 mm and a 0.4-mm ball pitch. It features bottom-side solder balls for compact mounting and thermal conduction to the PCB - requiring standard Type 3 solder paste and reflow profile per TI SMT guidelines.
What protection features are integrated into the LM3691TLX-3.3/NOPB?
The LM3691TLX-3.3/NOPB integrates current limiting (1250–1700 mA typical), thermal shutdown (150°C trip, 130°C recovery), undervoltage lockout (2.1–2.29 V), and soft-start (30 mV/μs output ramp). These functions operate autonomously without external components - safeguarding both the IC and downstream circuitry during faults, startup, or abnormal operating conditions.
LM3691TLX-3.3/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):
- 3.3V
- 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)
LM3691TLX-3.3/NOPB FAQ
1.How can I place an order for LM3691TLX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3691TLX-3.3/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 LM3691TLX-3.3/NOPB reliable?
The price and inventory of LM3691TLX-3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3691TLX-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM3691TLX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3691TLX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3691TLX-3.3/NOPB?
LM3691TLX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3691TLX-3.3/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 LM3691TLX-3.3/NOPB?
For technical support, including LM3691TLX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3691TLX-3.3/NOPB requirements.
6.How does Aetrix verify that LM3691TLX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3691TLX-3.3/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 LM3691TLX-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM3691TLX-3.3/NOPB?
All LM3691TLX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3691TLX-3.3/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 LM3691TLX-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM3691TLX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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