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Texas Instruments LM3691TLX-1.8/NOPB
- Part No.:
- LM3691TLX-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WFBGA, DSBGA
- Datasheet:
-
LM3691TLX-1.8/NOPB.pdf
- Description:
- IC REG BUCK 1.8V 1A 6DSBGA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM3691TLX-1.8/NOPB from Texas Instruments is a high-accuracy, miniature 1-A synchronous step-down DC-DC converter optimized for ultra-low-voltage portable systems powered by single-cell Li-Ion (2.3 V–5.5 V input) and delivering a fixed 1.8 V output with ±1% DC precision, 4-MHz switching frequency, and automatic ECO/PWM mode switching. It serves as the primary power rail regulator in space-constrained mobile applications requiring stable low-noise voltage under dynamic load.
For engineers reviewing the LM3691TLX-1.8/NOPB datasheet, LM3691TLX-1.8/NOPB pinout, LM3691TLX-1.8/NOPB application, or LM3691TLX-1.8/NOPB equivalent, key selection criteria include its 6-pin DSBGA package (1.59 mm × 1.295 mm), 64-μA typical quiescent current in ECO mode, 1-A maximum load capability, ±1% output voltage accuracy at 1.8 V, and integrated thermal/overcurrent protection - all critical for battery life extension and compact power design validation.
Technical Context
The LM3691TLX-1.8/NOPB employs voltage-mode control with input-voltage feed-forward to achieve tight line and load regulation across its 2.3 V–5.5 V input range. Its synchronous rectification uses an internal PFET/NFET pair with RDSON(P) = 250 mΩ max and RDSON(N) = 180 mΩ max, enabling high efficiency even at low output voltages like 1.8 V.
It supports three functional modes: shutdown (0.03 μA IQ), ECO mode (<50 mA load, 64 μA IQ, 30 mV p-p ripple), and forced PWM mode (4 MHz constant frequency, 490 μA IQ). Mode selection is controlled via the MODE pin, while EN enables/disables operation with logic thresholds of VIH = 1.2 V and VIL = 0.4 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V with ±1% DC accuracy - ensures stable core/logic rail for processors and memory without external feedback resistors. |
| Max Output Current | 1000 mA - supports high-current peripherals such as display drivers or RF modules in handheld devices. |
| Input Voltage Range | 2.3 V to 5.5 V - compatible with single Li-Ion (2.7–4.2 V), 3-cell NiMH/NiCd (2.4–4.5 V), and extended low-VIN operation down to 2.3 V. |
| Switching Frequency | 4 MHz (typical, PWM mode) - enables use of small 1-μH inductors and compact 0603 ceramic capacitors for <15 mm² total solution size. |
| Quiescent Current | 64 μA (typical, ECO mode) - extends battery runtime during standby/sleep states in always-on portable electronics. |
| Protection Features | Thermal shutdown (150°C trip), current limit (1500 mA typ), UVLO (2.1 V falling threshold) - ensures robust operation under fault conditions without external circuitry. |
| Package | 6-pin DSBGA (YZR), 1.59 mm × 1.295 mm - ultra-small footprint suitable for thin mobile PCBs with strict height constraints. |
Pinout & Package
LM3691TLX-1.8/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 fine-pitch assembly and requires standard reflow profiles per TI SMD guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | EN (Enable) | Digital input: device enabled when >1.2 V; shutdown when <0.4 V - allows system-level power sequencing and deep-sleep control. |
| A2 | VIN | Main power input (2.3–5.5 V); connects directly to 4.7-μF input capacitor - must be routed with low-inductance path to minimize switching noise. |
| B1 | MODE | Digital input: high = forced PWM mode; low = auto ECO/PWM switching - selects efficiency vs. ripple trade-off based on load profile. |
| B2 | SW | Switching node connecting internal PFET drain and NFET source - requires careful layout with minimal loop area to reduce EMI and voltage spikes. |
| C1 | FB | Feedback input - internally tied to 1.8 V reference; no external resistor divider needed for fixed-output variant. |
| C2 | GND | Power ground - must be connected to solid ground plane beneath IC to ensure thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic ECO/PWM mode switching | Transitions 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 diode - reduces conduction loss and improves light-load efficiency by up to 12% vs. asynchronous designs. |
| Soft-start | 30 mV/μs output ramp rate at 1.8 V - prevents inrush current and stabilizes supply during power-up in multi-rail systems. |
| Ultra-compact BOM | Only three external components required: 1-μH inductor, 4.7-μF input cap, 4.7-μF output cap - simplifies layout and reduces bill-of-materials cost. |
| Thermal and overload protection | Auto-recovering thermal shutdown (150°C trip / 130°C release) and cycle-by-cycle current limiting - protects IC and system during short-circuit or overtemperature events. |
Applications
| Mobile Phone Core Rail | MP3 Player Audio Codec Supply |
|---|---|
|
Use Scenario: Powers ARM Cortex-A/M cores and DDR I/O in sub-10-mm-thick smartphones operating from single Li-Ion cell. 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: Maintains ±1% output accuracy across temperature and load, ensuring reliable processor operation while extending battery life via ECO mode during idle periods. |
Use Scenario: Supplies clean 1.8 V bias to stereo audio DAC/ADC and headphone amplifier in portable music players. IC Role / Device Role / Timing Role: Low-noise, low-ripple power source with <30 mV p-p ripple in ECO mode - minimizes audible artifacts during playback. Use Value: Enables compact form factor with only three external passives and eliminates need for LDO post-regulation due to high PSRR and tight DC accuracy. |
| Hand-Held Radio Baseband | Portable HDD Controller Rail |
|
Use Scenario: Provides regulated 1.8 V to baseband SoC and RF transceiver interface logic in ruggedized two-way radios. IC Role / Device Role / Timing Role: High-efficiency step-down converter supporting wide input range (2.3–5.5 V) to accommodate aging NiMH batteries. Use Value: Delivers 1-A peak current during TX bursts while maintaining >80% efficiency at 2.5 V input - critical for field-deployed battery life. |
Use Scenario: Powers flash memory controller and SATA bridge IC in portable SSDs using single-cell Li-Ion input. IC Role / Device Role / Timing Role: Fast-transient capable buck regulator with soft-start and thermal protection - prevents data corruption during sudden load changes. Use Value: Ensures stable 1.8 V rail during read/write cycles with automatic mode switching to balance efficiency and response time. |
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, 20-μA IQ in DCS-Control™ eco-mode, 6-pin WSON (2 mm × 2 mm) | Larger package (2 mm² vs. 2.06 mm²), lower IQ but no MODE pin control - fully automatic mode transition only | Preferred when ultra-low IQ dominates design priority and board space permits slightly larger footprint. |
| AP63201WU-18 | Fixed 1.8 V, 2-A capability, 2.2-MHz switching, 30-μA IQ, 6-pin WLCSP (1.5 mm × 1.5 mm) | Higher current rating, lower switching frequency, different pinout (EN/SW/VIN/GND/FB/PG) - not pin-compatible | Selected when future-proofing for higher load headroom or where PG (power-good) signal is required for system sequencing. |
Compared with TPS62231DRYR and AP63201WU-18, LM3691TLX-1.8/NOPB offers unique manual MODE pin control for deterministic PWM/ECO selection, smallest DSBGA footprint among 1-A fixed 1.8 V converters, and highest switching frequency for minimal passive size - making it optimal for ultra-thin, battery-sensitive designs where layout area and transient response are critical.
Availability
LM3691TLX-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 LM3691TLX-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 leader specializing in analog and embedded processing technologies, with decades of expertise in power management ICs for portable and industrial applications.
The LM3691TLX-1.8/NOPB belongs to TI's high-efficiency miniature buck converter product line, designed specifically for space-constrained, battery-powered portable electronics requiring precise low-voltage rails with minimal external components.
FAQ
What is the output voltage tolerance of the LM3691TLX-1.8/NOPB?
The LM3691TLX-1.8/NOPB provides a fixed 1.8 V output with ±1% DC accuracy over temperature and line conditions. This specification is guaranteed across the full operating ambient temperature range (−30°C to +85°C) and input voltage range (2.3 V to 5.5 V), ensuring reliable operation for precision logic and memory rails without external trimming.
Does the LM3691TLX-1.8/NOPB require external feedback resistors?
No, the LM3691TLX-1.8/NOPB is a fixed-output variant with the feedback reference internally set to 1.8 V. Pin C1 (FB) is connected directly to the output capacitor and does not require external resistors - simplifying design and reducing component count compared to adjustable buck converters.
How does the MODE pin affect operation of the LM3691TLX-1.8/NOPB?
The MODE pin on the LM3691TLX-1.8/NOPB selects between forced PWM mode (MODE > 1.2 V) and automatic ECO/PWM mode (MODE < 0.4 V). In ECO mode, the device switches to gated PWM below ~50 mA load to reduce quiescent current to 64 μA; in forced PWM, it maintains constant 4-MHz operation regardless of load.
What is the minimum input voltage required for the LM3691TLX-1.8/NOPB to regulate 1.8 V?
The LM3691TLX-1.8/NOPB maintains regulation down to 2.3 V input, as specified in its recommended operating conditions. Below this, undervoltage lockout (UVLO) disables operation with a falling threshold of 2.1 V and rising threshold of 2.29 V - preventing unstable startup or dropout during battery discharge.
Can the LM3691TLX-1.8/NOPB drive a 1-A load continuously at 2.3 V input?
At 2.3 V input, the LM3691TLX-1.8/NOPB supports a maximum continuous load of 650 mA per TI's Overtemperature Maximum Load Recommendations. Attempting 1-A operation at this VIN risks thermal shutdown due to reduced efficiency and higher conduction losses - design derating or input voltage boost is advised for full 1-A capability.
LM3691TLX-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)
LM3691TLX-1.8/NOPB FAQ
1.How can I place an order for LM3691TLX-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3691TLX-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 LM3691TLX-1.8/NOPB reliable?
The price and inventory of LM3691TLX-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 LM3691TLX-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM3691TLX-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3691TLX-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3691TLX-1.8/NOPB?
LM3691TLX-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3691TLX-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 LM3691TLX-1.8/NOPB?
For technical support, including LM3691TLX-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3691TLX-1.8/NOPB requirements.
6.How does Aetrix verify that LM3691TLX-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3691TLX-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 LM3691TLX-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM3691TLX-1.8/NOPB?
All LM3691TLX-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3691TLX-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 LM3691TLX-1.8/NOPB part is unused and in its original packaging.
Return procedure for LM3691TLX-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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