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Texas Instruments LM3691TLX-1.0/NOPB
- Part No.:
- LM3691TLX-1.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WFBGA, DSBGA
- Datasheet:
-
LM3691TLX-1.0/NOPB.pdf
- Description:
- IC REG BUCK 1V 1A 6DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,577
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Product details
Overview
LM3691TLX-1.0/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 Li-Ion (2.3–5.5 V) or 3-cell NiMH/NiCd batteries. It delivers fixed 1.0-V output with ±1% DC precision, 4-MHz switching frequency, and supports automatic ECO/PWM mode switching to maximize light-load efficiency. It serves as the primary power rail regulator in compact battery-powered devices requiring stable low-voltage supply.
For engineers reviewing the LM3691TLX-1.0/NOPB datasheet, LM3691TLX-1.0/NOPB pinout, LM3691TLX-1.0/NOPB application, or LM3691TLX-1.0/NOPB equivalent, key selection criteria include its 1-A load capability at 1.0 V, 64-μA typical quiescent current in ECO mode, DSBGA-6 package footprint (<15 mm² solution size), and integrated synchronous rectification for high efficiency across input range 2.3–5.5 V.
Technical Context
The LM3691TLX-1.0/NOPB employs voltage-mode control with input-voltage feed-forward to achieve tight line and load regulation. Its internal architecture integrates a PFET high-side switch and NFET synchronous rectifier, enabling efficient buck conversion without external diodes.
It operates in three functional modes: shutdown (0.03 μA IQ), ECO (64 μA IQ, gated PWM, ~30 mV p-p ripple), and forced PWM (490 μA IQ, constant 4 MHz switching). Mode selection is controlled via the MODE pin, while EN enables/disables operation with undervoltage lockout (UVLO rising threshold 2.29 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.0 V with ±1% DC accuracy - ensures stable core logic or I/O rail compliance for low-voltage ASICs/FPGAs. |
| Max Output Current | 1000 mA - supports demanding portable loads including application processors and RF transceivers. |
| Input Voltage Range | 2.3 V to 5.5 V - compatible with single-cell Li-ion (discharged to 2.3 V) and 3-cell NiMH/NiCd battery stacks. |
| Switching Frequency | 4 MHz (typical) - enables use of small 1-μH inductors and minimizes solution footprint. |
| Quiescent Current | 64 μA (typical, ECO mode) - extends battery runtime during standby/sleep states in handheld devices. |
| Protection Features | Current overload limit (1500 mA typ), thermal shutdown (150°C), UVLO, and soft-start - ensures robust operation under fault and startup conditions. |
Pinout & Package
The LM3691TLX-1.0/NOPB is housed in a 6-pin DSBGA package (1.59 mm × 1.295 mm, 0.4-mm pitch), optimized for space-constrained portable PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (EN) | Enable input | Digital control: >1.2 V enables operation; <0.4 V forces shutdown (0.03 μA IQ); must not float. |
| A2 (VIN) | Power input | Main supply connection (2.3–5.5 V); requires local 4.7-μF ceramic capacitor to GND for noise filtering. |
| B1 (MODE) | Mode select | Digital input: high (>1.2 V) = forced PWM; low (<0.4 V) = auto ECO/PWM switching; must not float. |
| B2 (SW) | Switch node | Connection to internal PFET drain and NFET source; drives external 1-μH inductor; high dv/dt node. |
| C1 (FB) | Feedback input | Analog input tied directly to output capacitor; sets regulated 1.0-V output via internal 1.0-V reference. |
| C2 (GND) | Ground | Power and signal reference; must be low-impedance connection to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode; reduces conduction loss and improves efficiency at low VOUT (e.g., 1.0 V). |
| Automatic ECO/PWM mode transition | Switches at ~50 mA load threshold; maintains high efficiency across full 0–1000 mA range without external control. |
| Ultra-small solution size | Requires only three external components (1-μH inductor, 4.7-μF CIN, 4.7-μF COUT); total area <15 mm². |
| Robust protection suite | Includes thermal shutdown (150°C), overcurrent limiting (1500 mA), UVLO, and soft-start (30 mV/μs ramp) - prevents damage during faults and startup. |
Applications
| Mobile Phone Power Rail | MP3 Player Core Supply |
|---|---|
Use Scenario: Powers baseband processor or display driver IC in slim smartphone designs with single-cell Li-ion battery. IC Role / Device Role / Timing Role: Primary 1.0-V step-down regulator delivering up to 1 A with fast transient response to burst-mode processing loads. Use Value: Enables extended talk time via 64-μA ECO-mode IQ and maintains stable voltage during RF transmission peaks using 4-MHz PWM control. | Use Scenario: Supplies 1.0-V core voltage to audio codec or flash memory controller in portable music players. IC Role / Device Role / Timing Role: Fixed-output buck converter providing low-noise, tightly regulated supply with minimal external BOM. Use Value: Reduces PCB area by >40% vs. legacy solutions through DSBGA-6 package and three-component design, supporting sub-20-mm form factors. |
| Hand-Held Radio Baseband | Portable HDD Controller Rail |
Use Scenario: Regulates 1.0-V supply for digital baseband ASIC in ruggedized two-way radios operating from 3-cell NiMH packs. IC Role / Device Role / Timing Role: High-reliability DC-DC converter with thermal shutdown and current limiting for intermittent high-current TX bursts. Use Value: Sustains operation down to 2.3-V input (fully discharged battery) while maintaining ±1% output accuracy - critical for data integrity in digital modulation paths. | Use Scenario: Provides 1.0-V logic rail to SATA or USB bridge controller in portable external hard drives. IC Role / Device Role / Timing Role: Efficient, low-ripple power source supporting rapid spin-up and sustained read/write cycles. Use Value: Delivers 1000 mA peak current with <30 mV p-p ripple in ECO mode, minimizing bit errors during high-speed data transfers. |
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 | Fixed 1.0-V output, 4-MHz switching, 1-A rating, but uses WSON-6 (2.0×2.0 mm) - 2.5× larger footprint than DSBGA-6. | Same portable rail use case; less suitable for ultra-thin devices where board area is constrained. | Select when WSON handling is preferred over DSBGA assembly or when TI's long-term availability program is required. |
| RT8059ZSP | 1.0-V fixed output, 2-MHz switching, 1-A rating; lacks automatic ECO/PWM mode - only forced PWM or shutdown. | Lower light-load efficiency (no ECO mode); higher IQ (~200 μA) limits battery life in always-on features. | Choose for cost-sensitive designs where 4-MHz switching and ECO optimization are non-critical. |
Compared with TPS62231DRYR and RT8059ZSP, the LM3691TLX-1.0/NOPB offers the smallest PCB footprint (DSBGA-6), lowest light-load IQ (64 μA), and seamless ECO/PWM transition - making it optimal for space- and battery-life-constrained portable systems requiring precise 1.0-V regulation.
Availability
LM3691TLX-1.0/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-lifecycle support, and consistent parametric performance across production batches.
Supply support for LM3691TLX-1.0/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 LM3691TLX-1.0/NOPB belongs to TI's high-efficiency miniature DC-DC converter product line, designed specifically for ultra-low-voltage, space-constrained portable electronics powered by single-cell batteries.
FAQ
What is the output voltage tolerance of the LM3691TLX-1.0/NOPB?
The LM3691TLX-1.0/NOPB provides a fixed 1.0-V output with ±1% DC accuracy over temperature (−30°C to +85°C) and line/load conditions. This tight tolerance ensures reliable operation of sensitive low-voltage logic circuits without requiring external feedback resistors or trimming - a key advantage of its factory-trimmed internal reference.
Does the LM3691TLX-1.0/NOPB require external compensation components?
No, the LM3691TLX-1.0/NOPB is internally compensated and requires no external compensation network. Its voltage-mode control loop is optimized for stability with the recommended 1-μH inductor and 4.7-μF output capacitor, simplifying design and reducing BOM count - a direct benefit of its fixed-output, application-optimized architecture.
How does the MODE pin affect operation of the LM3691TLX-1.0/NOPB?
The MODE pin on the LM3691TLX-1.0/NOPB selects between two operational modes: pulling it high (>1.2 V) forces continuous PWM mode (4 MHz, 490 μA IQ), while pulling it low (<0.4 V) enables automatic ECO/PWM mode switching based on load current (~50 mA threshold). Leaving the pin unconnected is not allowed - it must be actively driven to ensure predictable behavior.
What is the minimum input voltage required for the LM3691TLX-1.0/NOPB to regulate 1.0 V?
The LM3691TLX-1.0/NOPB maintains regulation down to 2.3 V input, verified across temperature and load. Below this, UVLO disables switching (rising threshold 2.29 V). At VIN = 2.3 V and VOUT = 1.0 V, maximum supported load is 650 mA per thermal derating guidelines - sufficient for most low-power portable subsystems.
Can the LM3691TLX-1.0/NOPB be used with ceramic capacitors only?
Yes, the LM3691TLX-1.0/NOPB is fully compatible with ceramic input and output capacitors. TI specifies 4.7-μF X7R/X5R 0603 (1608) ceramics for both CIN and COUT; their low ESR ensures stable operation, minimal ripple (<30 mV p-p in ECO mode), and optimal transient response - no tantalum or electrolytic capacitors are needed or recommended.
LM3691TLX-1.0/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):
- 1V
- 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-1.0/NOPB FAQ
1.How can I place an order for LM3691TLX-1.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3691TLX-1.0/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-1.0/NOPB reliable?
The price and inventory of LM3691TLX-1.0/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-1.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM3691TLX-1.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3691TLX-1.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3691TLX-1.0/NOPB?
LM3691TLX-1.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3691TLX-1.0/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-1.0/NOPB?
For technical support, including LM3691TLX-1.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3691TLX-1.0/NOPB requirements.
6.How does Aetrix verify that LM3691TLX-1.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3691TLX-1.0/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-1.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM3691TLX-1.0/NOPB?
All LM3691TLX-1.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3691TLX-1.0/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-1.0/NOPB part is unused and in its original packaging.
Return procedure for LM3691TLX-1.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3691TLX-1.0/NOPB Tags
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