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Texas Instruments LM3691TL-1.0/NOPB
- Part No.:
- LM3691TL-1.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WFBGA, DSBGA
- Datasheet:
-
LM3691TL-1.0/NOPB.pdf
- Description:
- IC REG BUCK 1V 1A 6DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:682
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Product details
Overview
LM3691TL-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-cell Li-Ion (2.3 V–5.5 V) or 3-cell NiMH/NiCd batteries. It delivers a 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 powers core logic rails in mobile phones and MP3 players.
For engineers reviewing the LM3691TL-1.0/NOPB datasheet, LM3691TL-1.0/NOPB pinout, LM3691TL-1.0/NOPB application, or LM3691TL-1.0/NOPB equivalent, key selection criteria include its 1.0-V fixed output, 64-μA ECO-mode quiescent current, 1-A load capability, DSBGA-6 package footprint (<15 mm² solution size), and MODE-pin controllable operation between forced PWM and adaptive ECO modes.
Technical Context
The LM3691TL-1.0/NOPB uses 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 employs internal PFET and NFET switches with typical RDS(ON) of 250 mΩ (P) and 180 mΩ (N), enabling high efficiency at low output voltages.
It operates in three functional states: shutdown (0.03 µA IQ), ECO mode (64 µA IQ, gated PWM, ~30 mV p-p ripple), and forced PWM mode (490 µA IQ, 4 MHz constant frequency). Mode transitions occur automatically at ~50 mA load threshold, or are fixed via the MODE pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.0 V with ±1% DC accuracy - ensures stable core voltage for low-power microcontrollers and baseband ICs. |
| Max Output Current | 1000 mA - supports full-power operation of application processors and RF transceivers in portable devices. |
| Input Voltage Range | 2.3 V to 5.5 V - compatible with discharged Li-Ion cells (down to 2.3 V) and 3-cell NiMH/NiCd packs. |
| Switching Frequency | 4 MHz (typical) - enables use of tiny 1-µH inductors and minimizes solution footprint. |
| Quiescent Current (ECO) | 64 µA (typical) - extends battery runtime during display-off or standby states in handheld devices. |
| Protection Features | Current overload limit (1500 mA typ), thermal shutdown (150°C), UVLO (2.1 V falling), and soft-start (30 mV/µs) - ensures robust system-level reliability without external circuitry. |
Pinout & Package
LM3691TL-1.0/NOPB is housed in a 6-pin DSBGA package (1.59 mm × 1.295 mm, 0.5-mm pitch) with bottom-side solder balls. The package supports ultra-compact PCB layouts and requires no thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (EN) | Enable input | Active-high digital control: <0.4 V = shutdown (0.03 µA IQ); >1.2 V = enabled. Must not float. |
| A2 (VIN) | Power input | Primary supply rail connection (2.3–5.5 V); ties directly to 4.7-µF input capacitor for low-impedance decoupling. |
| B1 (MODE) | Mode select input | Logic-controlled operation: low = auto ECO/PWM switching; high = forced PWM. Must not float. |
| B2 (SW) | Switching node | Internal PFET drain / NFET source connection; drives external 1-µH inductor; high dv/dt node requiring tight layout. |
| C1 (FB) | Feedback input | Analog sense point tied directly to output capacitor; sets regulated 1.0-V output via internal 1% precision reference. |
| C2 (GND) | Ground reference | Power and signal return path; must be connected to low-impedance ground plane beneath the DSBGA footprint. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic ECO/PWM mode switching | Reduces quiescent current from 490 µA (PWM) to 64 µA (ECO) below ~50 mA load - extends battery life without firmware intervention. |
| Synchronous rectification | Integrated PFET/NFET power stage eliminates external Schottky diode - improves efficiency by >10% at 1.0-V/500-mA output vs. asynchronous designs. |
| Ultra-small solution size | Only three external components required (1-µH inductor, 4.7-µF CIN, 4.7-µF COUT) - total PCB area <15 mm² - ideal for space-constrained mobile PCBs. |
| ±1% output voltage accuracy | Tight DC regulation over temperature (−30°C to +85°C) and line/load - ensures reliable operation of 1.0-V I/O and core domains in SoCs. |
| Robust protection suite | Includes current limiting (1500 mA), thermal shutdown (150°C), UVLO (2.1 V), and soft-start - prevents damage during startup, short-circuit, or thermal overload events. |
Applications
| Mobile Phone Core Rail | MP3 Player DSP Supply |
|---|---|
Use Scenario: Powers ARM Cortex-M or baseband processor core domain in slim smartphones operating from a single Li-Ion cell. IC Role / Device Role / Timing Role: Primary 1.0-V synchronous buck regulator delivering up to 1 A with fast transient response to CPU burst loads. Use Value: Maintains ±1% output accuracy across 2.3–4.2 V input range and 1–1000 mA load, enabling reliable low-voltage operation while minimizing heat generation in sealed enclosures. |
Use Scenario: Supplies clean 1.0-V bias to audio DSP and codec in portable music players with battery life targets >20 hours. IC Role / Device Role / Timing Role: High-efficiency step-down converter operating in ECO mode during playback pause and forced PWM during decode bursts. Use Value: Achieves >85% efficiency at 10 mA (ECO) and >90% at 300 mA (PWM), directly extending playback time without increasing battery size. |
| Hand-Held Radio Baseband | Portable HDD Controller Rail |
Use Scenario: Provides regulated 1.0-V supply to RF transceiver baseband ICs in ruggedized two-way radios powered by NiMH packs. IC Role / Device Role / Timing Role: Input-capable down to 2.3 V with UVLO hysteresis - sustains operation through deep discharge cycles common in field use. Use Value: Delivers stable 1.0-V output despite wide input variation (2.4–4.5 V for NiMH), eliminating need for intermediate LDO stages and reducing BOM count. |
Use Scenario: Powers flash memory controller and interface logic in 1.8-inch portable hard disk drives with strict thermal limits. IC Role / Device Role / Timing Role: Compact 1-A buck converter with integrated thermal shutdown - protects drive electronics during sustained write operations. Use Value: Enables full 1-A delivery within 1.59 mm × 1.295 mm DSBGA footprint, allowing placement near controller IC with minimal trace length and EMI. |
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 1.0-V output, 1-A rating, 4-MHz switching, but uses QFN-6 (2 mm × 2 mm) instead of DSBGA; higher 85-μA ECO IQ. | Requires larger PCB area and different thermal layout; lacks automatic ECO/PWM transition - needs external mode control. | Select when QFN handling is preferred over DSBGA assembly or when tighter EMI filtering is needed via external compensation. |
| RT8059ZSP | 1.0-V fixed output, 1-A, 3-MHz switching, WDFN-6 (2 mm × 2 mm); no MODE pin - only forced PWM operation; 120-μA IQ. | No light-load efficiency optimization; higher quiescent current reduces standby battery life in always-on features. | Choose for cost-sensitive designs where ECO mode is unnecessary and board space allows larger package. |
Compared with TPS62231DRYR and RT8059ZSP, the LM3691TL-1.0/NOPB uniquely combines DSBGA-6 miniaturization, automatic ECO/PWM mode switching, and 64-μA light-load IQ - making it optimal for battery-powered devices requiring both compact size and extended runtime.
Availability
LM3691TL-1.0/NOPB is available at Aetrix Electronics and suitable for mobile phone core rails, MP3 player DSP supplies, hand-held radio baseband circuits, and portable HDD controller rails requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for LM3691TL-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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in power management ICs for portable and industrial applications.
The LM3691TL-1.0/NOPB belongs to TI's high-efficiency, miniature DC-DC converter product line designed specifically for ultra-low-voltage, battery-powered portable electronics - emphasizing small solution size, adaptive efficiency modes, and robust protection for consumer-grade reliability.
FAQ
What is the output voltage tolerance of the LM3691TL-1.0/NOPB over temperature and load?
The LM3691TL-1.0/NOPB guarantees ±1% DC output voltage accuracy across the full operating ambient temperature range (−30°C to +85°C) and load current range (0–1000 mA), as specified in the Electrical Characteristics table under VFB parameter. This precision is maintained without external feedback resistors since the 1.0-V reference is factory-trimmed and integrated into the LM3691TL-1.0/NOPB die.
How does the MODE pin affect operation of the LM3691TL-1.0/NOPB?
The MODE pin on the LM3691TL-1.0/NOPB selects between two operational modes: pulling MODE low (<0.4 V) enables automatic ECO/PWM mode switching based on load current (~50 mA threshold), while pulling MODE high (>1.2 V) forces continuous PWM operation regardless of load. Leaving MODE floating is prohibited - it must be actively driven or pulled to GND/VIN via resistor.
What external components are required for basic operation of the LM3691TL-1.0/NOPB?
The LM3691TL-1.0/NOPB requires only three external passive components: a 1-µH shielded power inductor (e.g., Murata LQM2HPN1R0MG0), a 4.7-µF X7R ceramic input capacitor placed adjacent to VIN/GND pins, and a 4.7-µF X7R ceramic output capacitor connected directly to FB/GND. No compensation network or feedback resistors are needed due to its fixed 1.0-V output architecture.
Does the LM3691TL-1.0/NOPB include thermal protection?
Yes, the LM3691TL-1.0/NOPB integrates thermal shutdown protection that disables both PFET and NFET switches when junction temperature exceeds approximately 150°C. Operation resumes automatically once the junction cools below ~130°C. This protection is fully internal and requires no external components - a core safety feature built into every LM3691TL-1.0/NOPB unit.
What is the minimum input voltage required for the LM3691TL-1.0/NOPB to regulate 1.0 V output?
The LM3691TL-1.0/NOPB maintains regulation down to an input voltage of 2.3 V, as defined in its Recommended Operating Conditions. Below this, undervoltage lockout (UVLO) activates at 2.1 V (falling threshold), disabling the device. At VIN = 2.3 V, the LM3691TL-1.0/NOPB still delivers full 1000 mA output current with ±1% accuracy - critical for supporting Li-Ion cells down to end-of-discharge.
LM3691TL-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)
LM3691TL-1.0/NOPB FAQ
1.How can I place an order for LM3691TL-1.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3691TL-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 LM3691TL-1.0/NOPB reliable?
The price and inventory of LM3691TL-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 LM3691TL-1.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM3691TL-1.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3691TL-1.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3691TL-1.0/NOPB?
LM3691TL-1.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3691TL-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 LM3691TL-1.0/NOPB?
For technical support, including LM3691TL-1.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3691TL-1.0/NOPB requirements.
6.How does Aetrix verify that LM3691TL-1.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3691TL-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 LM3691TL-1.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM3691TL-1.0/NOPB?
All LM3691TL-1.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3691TL-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 LM3691TL-1.0/NOPB part is unused and in its original packaging.
Return procedure for LM3691TL-1.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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