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Texas Instruments LM3691TL-1.2/NOPB
- Part No.:
- LM3691TL-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WFBGA, DSBGA
- Datasheet:
-
LM3691TL-1.2/NOPB.pdf
- Description:
- IC REG BUCK 1.2V 1A 6DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:207
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Product details
Overview
LM3691TL-1.2/NOPB from Texas Instruments is a high-accuracy, miniature 1-A synchronous step-down DC-DC converter optimized for ultra-low-voltage portable circuits powered by single Li-Ion (2.3 V–5.5 V) or 3-cell NiMH/NiCd batteries. It delivers a fixed 1.2 V output with ±1% DC precision, 4-MHz switching frequency, and supports up to 1000 mA load current in PWM mode. It is used in mobile phone core logic rails requiring stable low-noise power under dynamic load conditions.
For engineers reviewing the LM3691TL-1.2/NOPB datasheet, LM3691TL-1.2/NOPB pinout, LM3691TL-1.2/NOPB application, or LM3691TL-1.2/NOPB equivalent, key selection criteria include its ECO/PWM dual-mode operation, 64-μA quiescent current in ECO mode, DSBGA-6 package footprint (<15 mm² solution size), and integrated PFET/NFET synchronous rectification for efficiency at low output voltages.
Technical Context
The LM3691TL-1.2/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 internal architecture integrates a 160-mΩ PFET high-side switch and 115-mΩ NFET synchronous rectifier, enabling efficient conversion down to 1.2 V without external diodes.
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, constant 4 MHz switching). Mode selection is controlled via the MODE pin, while EN enables/disables regulation with soft-start (30 mV/µs ramp rate).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V with ±1% DC accuracy - ensures stable core supply for ARM Cortex-M or baseband processors. |
| Max Output Current | 1000 mA in PWM mode - supports burst-mode CPU loads in handheld radios and MP3 players. |
| Input Voltage Range | 2.3 V to 5.5 V - compatible with discharged Li-Ion (2.7 V min) and 3-cell NiMH (2.4 V min) battery stacks. |
| Switching Frequency | 4 MHz (typical) - enables use of compact 1-μH inductors and reduces EMI filtering requirements. |
| Quiescent Current | 64 μA in ECO mode - extends standby time in always-on sensor subsystems without compromising wake-up response. |
| Protection Features | Current limit (1500 mA typ), thermal shutdown (150°C), UVLO (2.1 V falling), and soft-start - prevents inrush damage during cold boot. |
| Package | 6-pin DSBGA (1.59 mm × 1.295 mm) - ultra-small footprint for space-constrained mobile PCBs with 0.4-mm pitch. |
Pinout & Package
LM3691TL-1.2/NOPB uses a 6-pin DSBGA (YZR) package with 0.4-mm ball pitch and 1.59 mm × 1.295 mm body size. The package is bottom-terminal only; no exposed pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (EN) | Enable input | Active-high digital control: >1.2 V enables regulation; <0.4 V forces shutdown (0.03 µA IQ); must not float. |
| A2 (VIN) | Power input | Primary supply rail connection; requires local 4.7-μF ceramic capacitor to GND for high-frequency noise suppression. |
| B1 (MODE) | Mode select | Logic input: high (>1.2 V) = forced PWM; low (<0.4 V) = auto ECO/PWM switching; determines light-load efficiency strategy. |
| B2 (SW) | Switch 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 1.2 V via internal 0.6-V reference and resistor divider (not used in fixed-output variants). |
| C2 (GND) | Ground reference | Power and signal return; must be connected to low-impedance ground plane beneath IC for thermal and noise performance. |
Key Features
| Feature | Design Value |
|---|---|
| ECO/PWM automatic mode switching | Transitions at ~50 mA load threshold - maintains >85% efficiency from 1 mA to 1 A without manual mode control. |
| Synchronous rectification | Integrated 115-mΩ NFET replaces Schottky diode - eliminates 0.3-V forward drop, improving 1.2-V output efficiency by ≥8% at 500 mA. |
| 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 including DSBGA footprint. |
| High-accuracy output regulation | ±1% DC output tolerance over −30°C to +85°C - meets core voltage requirements for ASICs and RF transceivers without post-regulation. |
| Robust protection suite | Thermal shutdown (150°C), current limiting (1500 mA), UVLO (2.1 V), and soft-start - ensures reliable startup and fault recovery in battery-powered systems. |
Applications
| Mobile Phone Baseband Core | Hand-Held Radio DSP Supply |
|---|---|
Use Scenario: Powers ARM9/ARM11 application processor core in GSM/WCDMA smartphones during active call and data sessions. IC Role / Device Role / Timing Role: Primary 1.2-V buck regulator delivering up to 1 A with fast transient response to CPU burst loads. Use Value: Maintains ±2% output regulation during 100-mA-to-800-mA load steps, preventing processor brownouts and ensuring deterministic real-time execution. |
Use Scenario: Supplies 1.2-V rail to digital signal processor in portable two-way radios operating on 3-cell NiMH packs. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter with ECO mode enabling >200-hour standby on single charge. Use Value: 64-μA quiescent current in ECO mode extends battery life by 3.2× versus standard PWM-only converters under 5-mA idle load. |
| MP3 Player Audio Codec | Portable HDD Controller |
Use Scenario: Provides clean 1.2-V supply to stereo audio codec IC in flash-based music players. IC Role / Device Role / Timing Role: Low-noise power source with <30-mV p-p ripple in ECO mode to minimize audible switching artifacts. Use Value: Synchronous rectification and 4-MHz operation reduce output ripple amplitude and shift noise spectrum above audio band (20 kHz), eliminating filter capacitors. |
Use Scenario: Powers 1.2-V interface logic of 2.5-inch portable hard disk drive controllers in ultrabooks and media players. IC Role / Device Role / Timing Role: High-current buck stage supporting 900-mA peak during HDD spin-up and seek operations. Use Value: 1000-mA capability and thermal shutdown prevent overheating during sustained 500-mA write bursts, ensuring data integrity and drive reliability. |
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 1.2 V, 600-mA max, 3-MHz switching, 22-μA IQ in DCS-Control mode | Lower current rating; superior light-load efficiency but insufficient for 1-A burst loads | Select when system peak current ≤600 mA and ultra-low IQ (<25 μA) is prioritized over full 1-A capability. |
| TPS62130ARGTR | Adjustable 0.9–3.6 V, 3-A max, 2.5-MHz, 17-μA IQ in PFM mode | Higher current, wider VOUT range, larger 16-pin QFN package (3.0 mm × 3.0 mm) | Select when design requires programmable output or >1-A headroom, accepting larger footprint and added BOM complexity. |
Compared with TPS62231DRYR and TPS62130ARGTR, the LM3691TL-1.2/NOPB uniquely balances 1-A capability, 6-pin DSBGA miniaturization, and ECO-mode IQ in a fixed 1.2-V solution-making it optimal for space-constrained portable devices where both peak current and standby efficiency are critical.
Availability
LM3691TL-1.2/NOPB is available at Aetrix Electronics and suitable for mobile phones, hand-held radios, MP3 players, and portable hard disk drives requiring stable component supply with guaranteed long-term sourcing.
Supply support for LM3691TL-1.2/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 technologies with over 50 years of innovation in energy-efficient electronics.
The LM3691TL-1.2/NOPB belongs to TI's portable power management portfolio, designed specifically for ultra-compact, battery-powered devices demanding high efficiency across wide load ranges-from microamp standby to ampere-level processing bursts.
FAQ
What is the output voltage tolerance of the LM3691TL-1.2/NOPB over temperature and line variations?
The LM3691TL-1.2/NOPB guarantees ±1% DC output voltage accuracy over the full operating ambient temperature range (−30°C to +85°C) and input voltage range (2.3 V to 5.5 V). This specification includes initial tolerance, line regulation, and load regulation effects, making LM3691TL-1.2/NOPB suitable for powering voltage-sensitive cores without additional post-regulation circuitry.
Can the LM3691TL-1.2/NOPB operate from a fully discharged Li-Ion cell?
Yes - the LM3691TL-1.2/NOPB supports input voltages as low as 2.3 V, which corresponds to the end-of-discharge voltage of a single Li-Ion cell. Its undervoltage lockout (UVLO) has a falling threshold of 2.1 V, allowing reliable operation down to 2.3 V while preventing malfunction during deep discharge. This ensures continuous 1.2-V output in LM3691TL-1.2/NOPB-powered devices until battery replacement is required.
How does the MODE pin affect efficiency and output ripple in the LM3691TL-1.2/NOPB?
When the MODE pin is pulled low, the LM3691TL-1.2/NOPB enters auto ECO mode, switching between gated PWM and forced PWM based on load. At loads <50 mA, it enters ECO mode (64 μA IQ, ~30 mV p-p ripple); above 50 mA, it transitions to PWM mode (490 μA IQ, <10 mV p-p ripple). This dual-mode behavior maximizes efficiency across the full 1 mA–1 A range without external control logic.
What external components are mandatory for basic operation of the LM3691TL-1.2/NOPB?
The LM3691TL-1.2/NOPB requires exactly three external components: a 1-μH shielded power inductor (e.g., Murata LQM2HPN1R0MG0), a 4.7-μF X7R ceramic input capacitor placed adjacent to VIN and GND pins, and a 4.7-μF X7R ceramic output capacitor connected directly to FB and GND. No compensation network or feedback resistors are needed - the 1.2-V output is internally trimmed and factory-set in LM3691TL-1.2/NOPB.
Does the LM3691TL-1.2/NOPB include thermal protection, and how does it behave under overload?
Yes - the LM3691TL-1.2/NOPB incorporates thermal shutdown that activates at approximately 150°C junction temperature, turning off both PFET and NFET switches. Operation resumes automatically when junction temperature falls below ~130°C. Under sustained overload, this protection prevents permanent damage. Additionally, current limiting (1500 mA typical) and timed current-limit mode (¼ frequency, NFET disabled) provide layered defense against short-circuit faults in LM3691TL-1.2/NOPB designs.
LM3691TL-1.2/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):
- 1.2V
- 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-1.2/NOPB FAQ
1.How can I place an order for LM3691TL-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3691TL-1.2/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-1.2/NOPB reliable?
The price and inventory of LM3691TL-1.2/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-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM3691TL-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3691TL-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3691TL-1.2/NOPB?
LM3691TL-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3691TL-1.2/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-1.2/NOPB?
For technical support, including LM3691TL-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3691TL-1.2/NOPB requirements.
6.How does Aetrix verify that LM3691TL-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3691TL-1.2/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-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM3691TL-1.2/NOPB?
All LM3691TL-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3691TL-1.2/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-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM3691TL-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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