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Texas Instruments LM3686TLE-AAED/NOPB
- Part No.:
- LM3686TLE-AAED/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 12-WFBGA, DSBGA
- Datasheet:
-
LM3686TLE-AAED/NOPB.pdf
- Description:
- IC REG TRPL BCK/LNR SYNC 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,447
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Product details
Overview
LM3686TLE-AAED/NOPB from Texas Instruments is a highly integrated power management IC combining a synchronous step-down DC-DC converter, a low-input linear regulator (LILO), and an ultra-low-noise LDO in a single 12-pin DSBGA package. It delivers up to 600 mA from the DC-DC stage, 350 mA from LILO, and 300 mA from the LDO across a 2.7 V–5.5 V input range, with fixed 3 MHz switching frequency and independent enable control for each rail - optimized for portable battery-powered systems like mobile TVs and PDAs.
For engineers reviewing the LM3686TLE-AAED/NOPB datasheet, LM3686TLE-AAED/NOPB pinout, LM3686TLE-AAED/NOPB application, or LM3686TLE-AAED/NOPB equivalent, key selection considerations include its triple-rail architecture, post-regulation capability of LILO, ultra-low 6.7 µVRMS LDO output noise, 2.5 µA shutdown current, and DSBGA thermal performance (RθJA = 80.9°C/W).
Technical Context
The LM3686TLE-AAED/NOPB integrates three independent regulated outputs: a voltage-mode synchronous buck converter (1.2 V–2.5 V, 600 mA max), a low-input linear regulator (LILO: 0.7 V–2.0 V, 350 mA max, <50 mV load transient), and an ultra-low-noise LDO (1.5 V–3.3 V, 300 mA max, 6.7 µVRMS noise). All rails share a common VBATT input and feature separate EN pins (EN_DCDC, EN_LILO, EN_LDO) enabling flexible power sequencing and partial-rail operation.
Its architecture supports automatic PFM/PWM mode switching: PWM at ≥70 mA load (3 MHz fixed frequency), PFM at light load (28 µA quiescent current), with internal soft-start, undervoltage lockout (2.65 V turn-on), and thermal shutdown (150°C). The LILO can operate in two modes - small-NMOS (≤50 mA, VIN_LILO = VBATT) or large-NMOS (≤350 mA, VIN_LILO = VOUT_DCDC) - depending on EN_DCDC state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports single Li-ion or 3-cell NiMH/NiCd batteries without external biasing. |
| DC-DC Output Range | 1.2 V to 2.5 V - programmable via external feedback resistor divider on FB_DCDC pin. |
| LILO Output Range | 0.7 V to 2.0 V - internally referenced, 50-mV step resolution, optimized for ultra-low-voltage core supplies. |
| LDO Output Range | 1.5 V to 3.3 V - high PSRR (85 dB @ 1 kHz), ultra-low noise (6.7 µVRMS), suitable for RF/analog circuits. |
| Switching Frequency | 3 MHz typical - enables use of tiny 0603/0402 passive components and compact 15.66 mm² total solution size. |
| Shutdown Current | 2.5 µA typical - minimizes battery drain during system sleep or standby states. |
| Thermal Resistance | RθJA = 80.9°C/W - validated for DSBGA YZR package under JEDEC JESD51-7 conditions. |
Pinout & Package
LM3686TLE-AAED/NOPB uses a 12-pin DSBGA (YZR) package with nominal body size 2.435 mm × 1.687 mm and 0.4-mm pitch. The package features separate PGND (power ground) and QGND (quiet ground) pins to isolate noisy switching paths from sensitive analog/LDO circuitry.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 PGND | Power Ground | Return path for DC-DC switch node and high-current paths; must be connected to low-impedance PCB ground plane. |
| A2 SW | Switch Node | Connection point between internal PFET and NFET; routes to external inductor and output capacitor. |
| A3 FB_DCDC | DC-DC Feedback Input | Analog input for closed-loop regulation; connects to VOUT_DCDC via resistive divider to set output voltage. |
| B1 VBATT | Main Power Input | Primary supply for DC-DC and bias for all regulators; requires local 4.7 µF ceramic decoupling. |
| B2 EN_LILO | LILO Enable Input | Digital control: >1.1 V enables LILO, <0.4 V disables; must not float - tie to VBATT or GPIO. |
| B3 EN_DCDC | DC-DC Enable Input | Digital control: >1.1 V enables buck converter, <0.4 V forces shutdown; controls LILO operating mode. |
| C1 VIN_LDO | LDO Input Supply | Must be tied directly to VBATT at all times; powers LDO reference and pass element. |
| C2 EN_LDO | LDO Enable Input | Digital control: >1.1 V enables LDO, <0.4 V disables; independent of other rails. |
| C3 QGND | Quiet Ground | Reference ground for LDO and internal analog circuits; isolated from PGND to preserve PSRR and noise performance. |
| D1 VOUT_LDO | LDO Output | Regulated output (1.5 V–3.3 V); requires 1 µF ceramic output capacitor for stability and transient response. |
| D2 VOUT_LILO | LILO Output | Low-input regulated output (0.7 V–2.0 V); requires 2.2 µF ceramic output capacitor for <50 mV load transients. |
| D3 VIN_LILO | LILO Input Supply | Accepts either VBATT (small-NMOS mode, ≤50 mA) or VOUT_DCDC (large-NMOS mode, ≤350 mA). |
Key Features
| Feature | Design Value |
|---|---|
| Triple-output architecture | Single-chip integration of buck + LILO + LDO eliminates discrete PMIC complexity and reduces BOM count by ≥3 ICs. |
| Independent enable control | Three dedicated EN pins allow precise power sequencing, dynamic rail enable/disable, and partial-system wake-up. |
| Post-regulation LILO | When EN_DCDC = HIGH, LILO draws from VOUT_DCDC - enabling tighter regulation, lower dropout, and higher efficiency than direct VBATT sourcing. |
| Ultra-low-noise LDO | 6.7 µVRMS output noise (10 Hz–100 kHz) and 85 dB PSRR @ 1 kHz make it suitable for powering RF transceivers and precision analog sensors. |
| Adaptive PFM/PWM mode | Automatic transition between 3 MHz PWM (≥70 mA) and hysteretic PFM (28 µA IQ) extends battery life without sacrificing transient response. |
Applications
| Mobile TV Power Management | Handheld Radio Baseband |
|---|---|
|
Use Scenario: Powering display driver ICs, video processors, and audio codecs in compact handheld TVs. IC Role / Device Role / Timing Role: LM3686TLE-AAED/NOPB provides three tightly regulated rails: 1.8 V for logic, 1.2 V for core, and 2.8 V for analog/audio - with independent sequencing. Use Value: Eliminates need for external LDOs and discrete DC-DC stages while maintaining <±30 mV load transient on LILO and <±2 mV line transient on LDO. |
Use Scenario: Supplying baseband processor, RF front-end, and memory in battery-operated handheld radios. IC Role / Device Role / Timing Role: LM3686TLE-AAED/NOPB delivers clean 1.2 V (LILO) for CPU core, 2.8 V (LDO) for RF synthesizer, and 1.8 V (DC-DC) for I/O - each with dedicated enable control. Use Value: 6.7 µVRMS LDO noise prevents phase noise degradation in VCOs; 3 MHz switching avoids interference in 2.4 GHz ISM band. |
| PDA Application Processor | Portable Instrument Sensor Interface |
|
Use Scenario: Powering ARM-based application processors with multiple voltage domains in palm-top PCs. IC Role / Device Role / Timing Role: LM3686TLE-AAED/NOPB supplies 1.2 V core (LILO), 3.3 V I/O (LDO), and 1.8 V memory interface (DC-DC), with EN pins synchronized to processor power states. Use Value: 2.5 µA shutdown current preserves battery during suspend-to-RAM; post-regulation LILO ensures stable core voltage during dynamic DVFS transitions. |
Use Scenario: Biasing precision ADCs, op-amps, and MEMS sensors in portable test equipment. IC Role / Device Role / Timing Role: LM3686TLE-AAED/NOPB provides ultra-low-noise 2.8 V (LDO) for analog signal chain and 1.2 V (LILO) for digital controller - isolated via QGND/PGND separation. Use Value: QGND routing and 85 dB PSRR suppress supply-induced errors; <1 mV line transients prevent measurement drift during battery voltage sag. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65132A1YFFR | Single-inductor dual-output (buck-boost + LDO), no LILO rail; 300 mA LDO only; 2.5 MHz switching. | Lacks low-input linear regulator - cannot replace LILO's 0.7 V–2.0 V range or post-regulation capability. | Select when only two rails needed and ultra-low-voltage core supply is not required. |
| TPS65217CRSLR | Quad-output PMIC (2 buck + 2 LDO), 1.8 V/1.2 V/3.3 V/1.8 V; no LILO topology; larger 48-pin QFN package. | Higher integration but no dedicated low-input regulator - less efficient for sub-1.0 V core supplies. | Select for complex SoC platforms requiring four rails and integrated fuel gauge, but not for space-constrained LILO-dependent designs. |
Compared with TPS65132A1YFFR and TPS65217CRSLR, LM3686TLE-AAED/NOPB uniquely combines a post-regulated LILO rail with ultra-low-noise LDO in a 12-pin DSBGA, delivering superior efficiency below 1.0 V and minimal board area - making it irreplaceable for compact, ultra-low-voltage portable systems.
Availability
LM3686TLE-AAED/NOPB is available at Aetrix Electronics and suitable for mobile TV power management, handheld radio baseband, PDA application processor, and portable instrument sensor interface applications requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for LM3686TLE-AAED/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 90 years of innovation in high-reliability, energy-efficient IC design.
LM3686TLE-AAED/NOPB belongs to TI's portable power management product line, engineered specifically for space-constrained, battery-powered devices demanding high integration, ultra-low noise, and intelligent power sequencing.
FAQ
What is the maximum output current capability of each rail in LM3686TLE-AAED/NOPB?
The LM3686TLE-AAED/NOPB supports up to 600 mA from the DC-DC converter (when not powering LILO), 350 mA from the LILO regulator (in large-NMOS mode with EN_DCDC enabled), and 300 mA from the LDO. These values are confirmed in the Electrical Characteristics tables under Recommended Operating Conditions and depend on thermal derating and input voltage. The LILO current drops to 50 mA if EN_DCDC is disabled and it operates in small-NMOS mode.
Does LM3686TLE-AAED/NOPB require external compensation components?
No, LM3686TLE-AAED/NOPB uses internal compensation for all three regulators. The DC-DC converter employs voltage-mode control with built-in error amplifier compensation; the LILO and LDO regulators are fully internally compensated. Only external passive components - one inductor and five ceramic capacitors - are required for full operation, per the Typical Application schematic in the datasheet.
How does the LILO regulator achieve low dropout and low-noise performance simultaneously?
The LM3686TLE-AAED/NOPB's LILO regulator uses a dedicated low-dropout NMOS pass device with optimized gate drive and separate QGND reference, enabling dropout as low as 50 mV at 350 mA while maintaining <50 mV load transients. Its noise performance is enhanced by internal filtering and quiet ground isolation - though not ultra-low-noise like the LDO, it achieves sufficient PSRR (>60 dB @ 100 kHz) for digital core supplies.
Can LM3686TLE-AAED/NOPB operate with a 2.5 V input supply?
No - LM3686TLE-AAED/NOPB has a minimum recommended input voltage of 2.7 V per Section 7.3 (Recommended Operating Conditions). At 2.5 V, the device may fail to start due to undervoltage lockout (typical turn-on threshold is 2.65 V), and LILO/LDO output accuracy and load regulation degrade outside specification. Operation below 2.7 V is not guaranteed and risks instability or shutdown.
What is the purpose of the QGND pin in LM3686TLE-AAED/NOPB?
The QGND (Quiet Ground) pin in LM3686TLE-AAED/NOPB serves as the dedicated return path for the LDO and internal analog reference circuits, physically and electrically isolated from PGND (Power Ground). This separation prevents switching noise from the DC-DC stage from coupling into the LDO output, preserving its 6.7 µVRMS noise performance and 85 dB PSRR - critical for RF and precision analog applications.
LM3686TLE-AAED/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Topology:
- Step-Down (Buck) Synchronous (1), Linear (LDO) (2)
- Number of Outputs:
- 3
- Frequency - Switching:
- 3MHz
- Voltage/Current - Output 1:
- 1.2V, 600mA
- Voltage/Current - Output 2:
- 1.8V, 350mA
- Voltage/Current - Output 3:
- 2.8V, 300mA
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DSBGA
LM3686TLE-AAED/NOPB FAQ
1.How can I place an order for LM3686TLE-AAED/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3686TLE-AAED/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 LM3686TLE-AAED/NOPB reliable?
The price and inventory of LM3686TLE-AAED/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3686TLE-AAED/NOPB is usually 5 days.
3.What payment methods are accepted for LM3686TLE-AAED/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3686TLE-AAED/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3686TLE-AAED/NOPB?
LM3686TLE-AAED/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3686TLE-AAED/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 LM3686TLE-AAED/NOPB?
For technical support, including LM3686TLE-AAED/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3686TLE-AAED/NOPB requirements.
6.How does Aetrix verify that LM3686TLE-AAED/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3686TLE-AAED/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 LM3686TLE-AAED/NOPB meets industry standards.
7.What is the process for return or replacement of LM3686TLE-AAED/NOPB?
All LM3686TLE-AAED/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3686TLE-AAED/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 LM3686TLE-AAED/NOPB part is unused and in its original packaging.
Return procedure for LM3686TLE-AAED/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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