My Inquiry
My Account
Texas Instruments LM3691TLX-2.5/NOPB
- Part No.:
- LM3691TLX-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WFBGA, DSBGA
- Datasheet:
-
LM3691TLX-2.5/NOPB.pdf
- Description:
- IC REG BUCK 2.5V 1A 6DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,887
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM3691TLX-2.5/NOPB from Texas Instruments is a high-accuracy, miniature 1-A synchronous step-down DC-DC converter optimized for portable applications powered by single Li-Ion (2.3–5.5 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 automatic ECO/PWM mode switching to maximize light-load efficiency. It is used in mobile phone core logic rails requiring stable low-voltage power with minimal solution size.
For engineers reviewing the LM3691TLX-2.5/NOPB datasheet, LM3691TLX-2.5/NOPB pinout, LM3691TLX-2.5/NOPB application, or LM3691TLX-2.5/NOPB equivalent, key selection criteria include its 2.5 V fixed output, DSBGA-6 package footprint (<15 mm² total solution), 64 µA typical quiescent current in ECO mode, and integrated PFET/NFET synchronous rectification enabling high efficiency across 1 mA–1 A load range.
Technical Context
The LM3691TLX-2.5/NOPB employs voltage-mode control with input-voltage feed-forward to achieve tight line and load regulation. Its internal architecture integrates a 160 mΩ PFET high-side switch and 115 mΩ NFET synchronous rectifier, enabling >90% peak efficiency at 100–500 mA loads under 3.6 V input.
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) active below 2.1 V VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±1% - ensures stable core supply for 2.5 V logic without external feedback resistors. |
| Max Output Current | 1000 mA - supports high-current digital subsystems such as baseband processors or display drivers. |
| Input Voltage Range | 2.3 V to 5.5 V - compatible with single Li-Ion (2.7–4.2 V) and 3-cell NiMH (2.4–4.5 V) battery systems. |
| Switching Frequency | 4 MHz (3.6–4.4 MHz) - enables use of ultra-small 1 µH inductors and reduces output filter component count. |
| Quiescent Current | 64 µA (ECO mode) - extends battery runtime during standby/sleep states in portable devices. |
| Protection Features | Current limit (1500 mA typ), thermal shutdown (150°C), UVLO, soft-start - prevents damage during fault conditions and inrush. |
| Package | 6-pin DSBGA (1.59 mm × 1.295 mm) - ultra-compact footprint ideal for space-constrained mobile PCB layouts. |
Pinout & Package
The LM3691TLX-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, requiring minimal copper pour for thermal management in handheld designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (EN) | Enable input | Active-high digital control: >1.2 V enables operation; <0.4 V forces shutdown (0.03 µA IQ); must not float. |
| A2 (VIN) | Power input | Primary supply input (2.3–5.5 V); connects directly to 4.7 µF ceramic input capacitor for low-impedance filtering. |
| B1 (MODE) | Mode select | Digital input: high (>1.2 V) forces PWM mode; low (<0.4 V) enables auto ECO/PWM switching based on load. |
| B2 (SW) | Switch node | Internal connection to PFET drain and NFET source; requires direct routing to 1 µH inductor with minimal trace inductance. |
| C1 (FB) | Feedback input | Not used for fixed-output variants - internally tied to 2.5 V reference; no external resistor network required. |
| C2 (GND) | Ground reference | System ground return for all internal circuitry; must be connected to low-impedance PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode, reducing conduction loss and improving efficiency at low VOUT (e.g., 2.5 V). |
| Automatic ECO/PWM mode transition | Switches seamlessly at ~50 mA load threshold to optimize IQ vs. ripple trade-off without firmware intervention. |
| Ultra-small BOM requirement | Only three external components needed: 1 µH inductor, 4.7 µF input cap, 4.7 µF output cap - solution area <15 mm². |
| Soft-start ramp rate | 30 mV/µs at VOUT = 1.8 V - limits inrush current during power-up, preventing input rail droop in battery-powered systems. |
| Thermal shutdown with hysteresis | Shuts down at TJ ≈ 150°C; resumes at TJ ≈ 130°C - protects against sustained overload or poor heatsinking in sealed enclosures. |
Applications
| Mobile Phone Baseband Power | MP3 Player Audio Codec Supply |
|---|---|
Use Scenario: Powers ARM-based baseband processor core logic requiring tightly regulated 2.5 V at up to 800 mA peak current during call processing. IC Role / Device Role / Timing Role: Primary step-down regulator delivering fixed 2.5 V with ±1% accuracy and fast transient response to handle burst-mode CPU loads. Use Value: Enables reliable operation across full battery discharge curve (4.2 V → 2.5 V) while maintaining >85% efficiency at 200 mA and <64 µA IQ in idle state. | Use Scenario: Supplies clean 2.5 V bias to stereo audio DAC and headphone amplifier in flash-based MP3 players. IC Role / Device Role / Timing Role: Low-noise, low-ripple DC-DC source supporting analog audio stages where PSRR and ripple sensitivity are critical. Use Value: Delivers <30 mV p-p ripple in ECO mode and <10 mV p-p in FPWM mode, minimizing audible noise and distortion in audio output. |
| Hand-Held Radio RF Front-End Bias | Portable HDD Motor Driver Logic |
Use Scenario: Provides 2.5 V supply to RF transceiver ICs and PLL synthesizers in compact two-way radios operating from 3.6 V nominal battery. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with 4 MHz switching to avoid interference with 2.4 GHz ISM band operation. Use Value: Enables compact layout with small 1 µH inductor and avoids switching harmonics near critical RF receive bands through precise frequency control. | Use Scenario: Powers motor driver gate logic and sensor interface circuits in 1.8-inch portable hard disk drives using 3-cell NiMH packs. IC Role / Device Role / Timing Role: Robust, thermally protected buck converter handling intermittent 500–1000 mA pulses during HDD spin-up and seek operations. Use Value: Sustains 1 A peak current with built-in current limiting and thermal shutdown, eliminating need for external protection circuitry in space-limited drive modules. |
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 2.5 V output, 1 A, 3–6 V input, 2.25 MHz switching, 22 µA IQ in DCS-Control™ eco-mode | Lower IQ but slower switching; requires larger inductor; different control scheme affects transient response | Preferred when ultra-low IQ dominates over size or high-frequency EMI concerns |
| AP63202WU-7 | Fixed 2.5 V output, 2 A, 2.5–5.5 V input, 2.1 MHz switching, 30 µA IQ in PFM mode | Higher current rating and wider VIN range; larger 8-pin WLCSP package (1.67 mm × 1.67 mm) | Selected when future-proofing for higher load or tighter VIN tolerance is required |
Compared with TPS62231DRYR and AP63202WU-7, the LM3691TLX-2.5/NOPB offers the smallest footprint (DSBGA-6), highest switching frequency (4 MHz), and lowest solution size (<15 mm²), making it optimal for ultra-thin mobile devices where board area and EMI filtering simplicity are prioritized over absolute minimum IQ.
Availability
LM3691TLX-2.5/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 with consistent parametric performance and long-term lifecycle support.
Supply support for LM3691TLX-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 and embedded processing technologies, with leadership in power management ICs for portable and industrial applications.
The LM3691TLX-2.5/NOPB belongs to TI's portable DC-DC converter product line, designed specifically to replace linear regulators in battery-powered devices by delivering high efficiency, minimal external components, and robust protection in sub-2 mm² packages.
FAQ
What is the output voltage tolerance of the LM3691TLX-2.5/NOPB?
The LM3691TLX-2.5/NOPB provides a fixed 2.5 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 stable power delivery to sensitive digital loads without external trimming.
Does the LM3691TLX-2.5/NOPB require external feedback resistors?
No, the LM3691TLX-2.5/NOPB does not require external feedback resistors. As a fixed-output variant, its 2.5 V regulation is achieved via an internal resistor divider connected to the FB pin (C1), which is internally tied to the reference. The FB pin remains unconnected in standard implementation, simplifying layout and reducing BOM count.
How does the MODE pin affect operation of the LM3691TLX-2.5/NOPB?
The MODE pin on the LM3691TLX-2.5/NOPB selects between forced PWM mode (MODE > 1.2 V) and automatic ECO/PWM mode (MODE < 0.4 V). In automatic mode, the device transitions between high-efficiency gated PWM (ECO) at light loads (<50 mA) and constant-frequency PWM at heavier loads - optimizing IQ and ripple dynamically without host control.
What is the recommended inductor value for the LM3691TLX-2.5/NOPB?
Texas Instruments recommends a 1 µH shielded surface-mount inductor rated for ≥1.5 A saturation current, such as Murata LQM2HPN1R0MG0 or TDK MLP2520S1R0L. The inductor must have DCR < 0.1 Ω to maintain high efficiency at full load, and its DC bias characteristics must sustain inductance under peak current to prevent saturation-induced instability in the LM3691TLX-2.5/NOPB.
Is the LM3691TLX-2.5/NOPB RoHS-compliant and lead-free?
Yes, the LM3691TLX-2.5/NOPB is RoHS-compliant and lead-free. The "/NOPB" suffix explicitly denotes lead-free (Pb-free) packaging per JEDEC J-STD-609, and the device meets TI's environmental compliance standards including exemption 7a for high-melting-temperature solder alloys. Full compliance documentation is available in TI's official product change notices.
LM3691TLX-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)
LM3691TLX-2.5/NOPB FAQ
1.How can I place an order for LM3691TLX-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3691TLX-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 LM3691TLX-2.5/NOPB reliable?
The price and inventory of LM3691TLX-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 LM3691TLX-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM3691TLX-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3691TLX-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3691TLX-2.5/NOPB?
LM3691TLX-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3691TLX-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 LM3691TLX-2.5/NOPB?
For technical support, including LM3691TLX-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3691TLX-2.5/NOPB requirements.
6.How does Aetrix verify that LM3691TLX-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3691TLX-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 LM3691TLX-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM3691TLX-2.5/NOPB?
All LM3691TLX-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3691TLX-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 LM3691TLX-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM3691TLX-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3691TLX-2.5/NOPB Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
