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Texas Instruments LM3691TL-2.5/NOPB
- Part No.:
- LM3691TL-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WFBGA, DSBGA
- Datasheet:
-
LM3691TL-2.5/NOPB.pdf
- Description:
- IC REG BUCK 2.5V 1A 6DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:622
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Product details
Overview
LM3691TL-2.5/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 V–5.5 V) or 3-cell NiMH/NiCd batteries. It delivers a fixed 2.5 V output with ±1% DC precision, 4-MHz switching frequency, and supports up to 1000 mA load current in PWM mode - enabling compact power rails for mobile phone baseband processors.
For engineers reviewing the LM3691TL-2.5/NOPB datasheet, LM3691TL-2.5/NOPB pinout, LM3691TL-2.5/NOPB application, or LM3691TL-2.5/NOPB equivalent, key selection considerations 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 high efficiency at light-to-moderate loads.
Technical Context
The LM3691TL-2.5/NOPB implements voltage-mode control with input-voltage feed-forward to maintain tight line regulation across its 2.3 V–5.5 V input range. Its internal synchronous rectifier replaces external diodes, reducing conduction loss and improving efficiency - especially critical at low output voltages like 2.5 V.
It features automatic mode switching between ECO (gated PWM, 64 μA IQ) and forced PWM (4 MHz, 490 μA IQ) based on load current threshold (~50 mA typical), plus undervoltage lockout (2.1 V falling, 2.29 V rising), thermal shutdown (150°C trip), and peak-current limiting (1500 mA typical).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V with ±1% DC accuracy - ensures stable core voltage for 2.5-V logic domains without external feedback resistors. |
| Max Output Current | 1000 mA in PWM mode - supports high-current peripherals such as display drivers or 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 full-range NiMH/NiCd battery stacks. |
| Switching Frequency | 4 MHz (typical) - enables use of small 1-μH inductors and reduces solution footprint versus lower-frequency buck converters. |
| Quiescent Current | 64 μA (typical) in ECO mode - extends battery runtime during standby or low-activity states in handheld radios or MP3 players. |
| Efficiency Peak | ≥90% at 100–500 mA (VIN = 3.6 V, VOUT = 2.5 V) - minimizes thermal dissipation in thermally constrained DSBGA-6 packaging. |
| Protection Features | Current overload limit (1500 mA), thermal shutdown (150°C), UVLO (2.29 V rise / 2.1 V fall), and soft-start (30 mV/μs ramp) - ensures robust operation under fault and startup conditions. |
Pinout & Package
The LM3691TL-2.5/NOPB is housed in a 6-pin DSBGA (YZR) package measuring 1.59 mm × 1.295 mm with bottom-side ball layout. Thermal performance is characterized by RθJA = 85°C/W.
| 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 connection (2.3–5.5 V); requires local 4.7-μF ceramic decoupling capacitor. |
| B1 (MODE) | Mode select | Logic input: low = auto ECO/PWM switching, high = forced PWM; determines light-load efficiency behavior. |
| B2 (SW) | Switch node | Internal PFET drain / NFET source connection; drives external 1-μH inductor; high dv/dt node requiring careful layout. |
| C1 (FB) | Feedback input | Analog sense point tied directly to output capacitor; sets regulated 2.5 V via internal reference - no external resistor divider needed. |
| C2 (GND) | Ground reference | Power and signal ground return; must be low-impedance connection to minimize noise and thermal resistance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode, reducing conduction loss and improving efficiency by ~5–8% at 2.5 V output vs. asynchronous designs. |
| Auto ECO/PWM mode switching | Transitions at ~50 mA load threshold - maintains high efficiency (>85%) from 1 mA to 1000 mA without manual mode control. |
| Ultra-small solution size | Requires only three external components (1-μH inductor, 4.7-μF CIN, 4.7-μF COUT) - total PCB area <15 mm² including DSBGA-6 footprint. |
| ±1% output voltage accuracy | Guaranteed over temperature (−30°C to +85°C) and line/load - eliminates need for post-regulation LDO in noise-tolerant 2.5-V rails. |
| 4-MHz constant-frequency PWM | Enables predictable EMI filtering and supports compact magnetics; avoids sub-harmonic instability common in current-mode controllers. |
Applications
| Mobile Phone Baseband | Hand-Held Radio Audio Codec |
|---|---|
Use Scenario: Powers baseband processor core logic requiring stable 2.5 V rail during burst data transmission and deep sleep cycles. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 2.5 V from single Li-Ion cell; manages dynamic load steps up to 800 mA with <2% output deviation. Use Value: ECO mode reduces IQ to 64 μA during idle, extending talk time by 12–18% versus fixed-PWM alternatives; 4-MHz switching avoids interference with cellular band receivers. | Use Scenario: Supplies clean 2.5 V bias to analog audio codec and RF front-end in battery-powered two-way radios. IC Role / Device Role / Timing Role: Synchronous buck converter with integrated FETs; provides low-noise 2.5 V output with <30 mVPP ripple in ECO mode and <15 mVPP in PWM mode. Use Value: Soft-start (30 mV/μs) prevents audio pop during power-on; thermal shutdown protects against enclosure overheating during extended transmit duty cycles. |
| MP3 Player NAND Flash Interface | Portable HDD 2.5-V I/O Rail |
Use Scenario: Generates 2.5 V for NAND flash memory interface and USB PHY in portable media players. IC Role / Device Role / Timing Role: Fixed-output DC-DC regulator supporting intermittent 500 mA read/write bursts and <1 mA standby current. Use Value: Automatic mode switching maintains >87% efficiency across 0.1–500 mA load range; DSBGA-6 package enables placement beneath flash BGA for minimal trace length. | Use Scenario: Powers 2.5-V I/O circuitry of 2.5-inch portable hard disk drives operating from 3-cell NiMH packs (3.6 V nominal). IC Role / Device Role / Timing Role: High-current buck converter handling 1-A peak loads during spin-up and sustained 650 mA at 2.3 V input (discharged battery). Use Value: Overtemperature derating table confirms 650 mA max at VIN = 2.3 V - matches HDD spec sheet requirements without thermal throttling. |
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 |
|---|---|---|---|
| TPS62231DRVR | Fixed 2.5 V output, 1-A rating, 3-MHz switching, 22-μA IQ in DCS-Control™ eco-mode; WSON-6 package (2.0 × 2.0 mm). | Lower IQ enables longer standby but requires external compensation; less efficient below 2.5 V input due to higher dropout. | Prefer for ultra-low-power always-on subsystems where 22-μA IQ outweighs 15% larger footprint. |
| RT8059GJ6 | Fixed 2.5 V, 1-A, 2-MHz, 55-μA IQ in ECO mode; TSOT-23-6 package; no MODE pin - auto-switching only. | Larger package (2.9 × 1.6 mm), lower switching frequency increases inductor size; lacks forced-PWM option for noise-sensitive apps. | Prefer when board space allows TSOT-23 and deterministic ECO-only operation suffices. |
Compared with TPS62231DRVR and RT8059GJ6, the LM3691TL-2.5/NOPB offers the smallest total solution size (<15 mm²), highest switching frequency (4 MHz), and explicit MODE pin control - making it optimal for space-constrained portable designs requiring both low-IQ standby and noise-controllable PWM operation.
Availability
LM3691TL-2.5/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, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM3691TL-2.5/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, embedded processing, and power management ICs, with decades of leadership in high-efficiency DC-DC conversion technology.
The LM3691TL-2.5/NOPB belongs to TI's portable power management portfolio, designed specifically to replace linear regulators in battery-powered devices where efficiency, size, and light-load IQ are critical system-level constraints.
FAQ
What is the output voltage tolerance of the LM3691TL-2.5/NOPB over temperature and line conditions?
The LM3691TL-2.5/NOPB guarantees ±1% DC output voltage accuracy across the full operating ambient temperature range (−30°C to +85°C), input voltage (2.3 V to 5.5 V), and load (0–1000 mA). This specification is confirmed in the Electrical Characteristics table of the SNVS506J datasheet and applies directly to the LM3691TL-2.5/NOPB fixed-output variant without external feedback components.
Does the LM3691TL-2.5/NOPB require external feedback resistors to set its 2.5 V output?
No, the LM3691TL-2.5/NOPB does not require external feedback resistors. Its 2.5 V output is factory-trimmed and internally fixed; the FB pin connects directly to the output capacitor as a sensing node. This eliminates resistor matching errors and saves PCB space - a key advantage over adjustable buck converters like the LM3691TLX-2.5/NOPB.
How does the MODE pin affect efficiency in the LM3691TL-2.5/NOPB?
When the MODE pin is pulled low, the LM3691TL-2.5/NOPB operates in auto ECO/PWM mode, switching to ECO (gated PWM) below ~50 mA load to achieve 64 μA quiescent current and >85% efficiency at 1 mA. When MODE is high, it forces continuous PWM mode (490 μA IQ), ensuring constant 4-MHz operation - preferred for noise-sensitive applications despite higher light-load IQ.
What is the minimum input voltage required for the LM3691TL-2.5/NOPB to regulate 2.5 V output?
The LM3691TL-2.5/NOPB requires a minimum input voltage of 2.3 V to maintain regulation at 2.5 V output. Below this, undervoltage lockout (UVLO) disables operation - the rising threshold is 2.29 V and falling threshold is 2.1 V. At VIN = 2.3 V, maximum supported load is 650 mA per the Overtemperature Maximum Load table in the datasheet.
Can the LM3691TL-2.5/NOPB drive a 1-A load continuously in all operating conditions?
The LM3691TL-2.5/NOPB supports 1000 mA continuous load only when input voltage is ≥2.5 V and junction temperature remains ≤125°C. At VIN = 2.3 V, the maximum recommended load drops to 650 mA to prevent thermal shutdown. Layout, PCB copper area, and ambient temperature directly impact achievable continuous current - refer to RθJA = 85°C/W and thermal derating guidelines in Section 7.4.
LM3691TL-2.5/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):
- 2.5V
- 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-2.5/NOPB FAQ
1.How can I place an order for LM3691TL-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3691TL-2.5/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-2.5/NOPB reliable?
The price and inventory of LM3691TL-2.5/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-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM3691TL-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3691TL-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3691TL-2.5/NOPB?
LM3691TL-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3691TL-2.5/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-2.5/NOPB?
For technical support, including LM3691TL-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3691TL-2.5/NOPB requirements.
6.How does Aetrix verify that LM3691TL-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3691TL-2.5/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-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM3691TL-2.5/NOPB?
All LM3691TL-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3691TL-2.5/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-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM3691TL-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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