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Texas Instruments LM3686TLX-AAEF/NOPB
- Part No.:
- LM3686TLX-AAEF/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 12-WFBGA
- Datasheet:
-
LM3686TLX-AAEF/NOPB.pdf
- Description:
- IC REG TRPL BCK/LNR SYNC 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,676
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Product details
Overview
LM3686TLX-AAEF/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 - all in a single 12-pin DSBGA package. It delivers three regulated outputs (1.2–2.5 V DC-DC, 0.7–2.0 V LILO, 1.5–3.3 V LDO) with combined load capability up to 900 mA, operating from 2.7 V to 5.5 V input - optimized for Li-ion-powered portable electronics requiring tight voltage regulation and low noise.
For engineers reviewing the LM3686TLX-AAEF/NOPB datasheet, LM3686TLX-AAEF/NOPB pinout, LM3686TLX-AAEF/NOPB application, or LM3686TLX-AAEF/NOPB equivalent, key selection considerations include independent enable control per rail, 3 MHz fixed-frequency PWM operation with automatic PFM transition at light load, <166 µVRMS LILO output noise, and thermal shutdown protection at 150°C junction temperature.
Technical Context
The LM3686TLX-AAEF/NOPB integrates three independent regulation stages: a voltage-mode synchronous buck converter (3 MHz typical switching frequency, internal PFET/NFET, 600 mA max DC-DC output), a post-regulated LILO stage (350 mA max, 70 µA quiescent current, <30 mV load transient deviation), and a standalone LDO (300 mA max, 50 µA IQ, 6.7 µVRMS output noise). Each rail has dedicated enable pins (EN_DCDC, EN_LILO, EN_LDO) and separate ground paths (PGND for power-switching, QGND for analog/LDO reference).
Its architecture supports flexible power sequencing: LILO can operate from VBATT directly (≤50 mA) when DC-DC is disabled, or from DC-DC output (≤350 mA) when both enables are asserted. The device uses internal 0.5 V and 1.8 V references to support programmable output voltages via external feedback resistors, with undervoltage lockout (UVLO) activating at ~2.65 V and releasing at ~2.41 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports single-cell Li-ion or 3-cell NiMH/NiCd battery inputs without external pre-regulation. |
| DC-DC Output Range | 1.2 V to 2.5 V - set via external FB_DCDC resistor divider; 1.8 V nominal in typical application. |
| LILO Output Range | 0.7 V to 2.0 V - post-regulated from DC-DC output; 1.2 V nominal with <30 mV load transient deviation. |
| LDO Output Range | 1.5 V to 3.3 V - independently biased from VBATT; 2.8 V nominal with 6.7 µVRMS broadband noise. |
| Switching Frequency | 3 MHz (typical) - enables use of small 0603/0402 ceramic capacitors and compact 1.0 µH inductors. |
| Quiescent Current (Global) | 100 µA (full-power mode), 2.5 µA (shutdown) - extends battery life in standby and active states. |
| Thermal Protection | Junction shutdown at 150°C (typical), recovery at 130°C - prevents permanent damage during overload or poor PCB thermal design. |
Pinout & Package
LM3686TLX-AAEF/NOPB is housed in a 12-pin DSBGA (YZR) package measuring 2.435 mm × 1.687 mm, with ball pitch of 0.4 mm. The package features separate PGND (power ground) and QGND (quiet ground) terminals to isolate switching noise from sensitive analog/LDO circuitry.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 PGND | Power Ground | Return path for DC-DC switch node (SW) and high-current paths; must be connected to low-impedance PCB ground plane. |
| A2 SW | Switch Node | Connection point between internal PFET drain and NFET source; drives external inductor and requires tight layout to minimize EMI. |
| A3 FB_DCDC | DC-DC Feedback Input | Analog input monitoring DC-DC output voltage; connects to resistor divider from VOUT_DCDC to set regulated output. |
| B1 VBATT | Main Power Input | Primary supply for DC-DC stage and bias for LDO; requires local 4.7 µF ceramic capacitor to PGND. |
| B2 EN_LILO | LILO Enable Input | Digital control pin: >1.1 V enables LILO, <0.4 V disables; must not float; controls large-NMOS (350 mA) or small-NMOS (50 mA) operation. |
| B3 EN_DCDC | DC-DC Enable Input | Digital control pin: >1.1 V enables buck converter, <0.4 V forces shutdown; used for sequencing and power gating. |
| C1 VIN_LDO | LDO Input Supply | Direct connection to VBATT required at all times to power internal LDO reference and bias circuits. |
| C2 EN_LDO | LDO Enable Input | Digital control pin: >1.1 V enables LDO output, <0.4 V disables; independent of other rails for flexible power management. |
| C3 QGND | Quiet Ground | Reference ground for LDO and LILO analog circuitry; isolated from PGND to preserve PSRR and noise performance. |
| D1 VOUT_LDO | LDO Output | Regulated output (1.5–3.3 V); supplies noise-sensitive loads like RF transceivers or ADCs; requires 1 µF ceramic capacitor to QGND. |
| D2 VOUT_LILO | LILO Output | Low-input, low-noise output (0.7–2.0 V); powers core logic or memory; requires 2.2 µF ceramic capacitor to PGND. |
| D3 VIN_LILO | LILO Input Supply | Accepts either DC-DC output (post-regulation) or direct VBATT; determines LILO current capability (350 mA vs 50 mA). |
Key Features
| Feature | Design Value |
|---|---|
| Independent Triple-Rail Control | Three dedicated enable pins (EN_DCDC, EN_LILO, EN_LDO) allow precise sequencing, dynamic rail disabling, and partial-system power-down without affecting other outputs. |
| Auto PFM/PWM Mode Switching | Seamlessly transitions from 3 MHz PWM (≥70 mA load) to hysteretic PFM (<70 mA) to reduce IQ to 28 µA - extending battery runtime in mixed-load applications. |
| Ultra-Low-Noise LDO | 6.7 µVRMS output noise (10 Hz–100 kHz) and 85 dB PSRR at 1 kHz - suitable for powering RF front-ends and precision analog signal chains. |
| Low-Input Linear Regulator (LILO) | Supports 0.7 V minimum output with <30 mV load transient deviation and 166 µVRMS noise - ideal for sub-1 V digital core supplies. |
| Integrated Thermal Protection | Internal thermal shutdown engages at 150°C junction temperature and releases at 130°C - eliminates need for external thermal monitoring in space-constrained designs. |
Applications
| Mobile Handheld Radios | Personal Digital Assistants (PDAs) |
|---|---|
|
Use Scenario: Battery-powered handheld radios requiring simultaneous 1.8 V RF synth, 1.2 V baseband processor core, and 3.0 V audio codec supply. IC Role / Device Role / Timing Role: LM3686TLX-AAEF/NOPB provides three independent, low-noise, sequenced power rails from a single Li-ion cell. Use Value: Eliminates need for discrete DC-DC + dual LDO solution; reduces BOM count by ≥4 components and PCB area by >30% versus discrete alternatives. |
Use Scenario: Palm-sized PDA with ARM-based application processor, LCD controller, and touch interface - all demanding tightly regulated, low-ripple supplies. IC Role / Device Role / Timing Role: LM3686TLX-AAEF/NOPB delivers 1.2 V LILO for CPU core, 2.8 V LDO for I/O, and 1.8 V DC-DC for memory interface - with independent enable control for sleep/wake states. Use Value: Enables fast wake-up from deep-sleep (2.5 µA shutdown current) and maintains <±15 mV line transient response on all rails during battery voltage sag. |
| Portable Medical Instruments | Battery-Powered Test Equipment |
|
Use Scenario: Portable glucose meter or pulse oximeter using low-power MCU, analog sensor front-end, and OLED display - all powered from coin-cell or Li-ion. IC Role / Device Role / Timing Role: LM3686TLX-AAEF/NOPB supplies 1.2 V LILO for MCU core, 2.8 V LDO for precision op-amps and ADC reference, and 1.8 V DC-DC for display driver. Use Value: Achieves <166 µVRMS noise on LILO rail and 85 dB PSRR on LDO rail - preserving signal integrity in µV-level biomedical measurements. |
Use Scenario: Handheld multimeter or signal generator needing stable analog supplies, clean digital core voltage, and accurate reference generation. IC Role / Device Role / Timing Role: LM3686TLX-AAEF/NOPB powers 1.2 V LILO for microcontroller, 2.8 V LDO for DAC/ADC reference, and 1.8 V DC-DC for display backlight - with independent enable for calibration mode. Use Value: Maintains ±0.1% output accuracy over –40°C to +85°C and supports <10 µs startup time - enabling rapid instrument boot and measurement readiness. |
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 |
|---|---|---|---|
| TPS65132A1YFFT | Single-inductor dual-output (boost + LDO), no LILO stage; 300 mA total output; 2.5 MHz switching. | Lacks low-input linear regulator (LILO) and independent triple-rail control; limited to dual-rail systems with higher minimum VOUT. | Choose TPS65132A1YFFT only if LILO functionality is unnecessary and system requires boost capability instead of buck-only topology. |
| TPS62231DRYT | Single-channel 3 MHz buck converter only (600 mA), no integrated LDO or LILO; requires external regulators for auxiliary rails. | Cannot replace LM3686TLX-AAEF/NOPB's triple-rail integration; adds ≥2 external ICs and ≥8 passive components to match functionality. | Use TPS62231DRYT only when only DC-DC conversion is needed and board space allows separate LDO/LILO implementation. |
Compared with TPS65132A1YFFT and TPS62231DRYT, LM3686TLX-AAEF/NOPB uniquely integrates three functionally distinct regulation stages - including a dedicated low-input linear regulator - in one die and package, reducing component count, footprint, and design complexity for portable battery-powered systems requiring sub-1 V core supplies.
Availability
LM3686TLX-AAEF/NOPB is available at Aetrix Electronics and suitable for mobile handheld radios, personal digital assistants, portable medical instruments, battery-powered test equipment, and portable instrumentation requiring stable component supply across extended production lifecycles.
Supply support for LM3686TLX-AAEF/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, industrial, and automotive applications.
LM3686TLX-AAEF/NOPB belongs to TI's portable power management product line, designed specifically for space-constrained, battery-operated devices requiring high-efficiency DC-DC conversion paired with ultra-low-noise and low-input linear regulation.
FAQ
What is the maximum supported output current for each rail of the LM3686TLX-AAEF/NOPB?
The LM3686TLX-AAEF/NOPB supports up to 600 mA from its DC-DC converter (when not powering the LILO stage), 350 mA from the LILO regulator (when enabled with EN_DCDC high), and 300 mA from the LDO. These values are confirmed in the Electrical Characteristics tables under Sections 7.5–7.7 of the SNVS520F datasheet. The LILO current drops to 50 mA if EN_DCDC is low and LILO is powered directly from VBATT.
Does the LM3686TLX-AAEF/NOPB require external compensation components?
No, the LM3686TLX-AAEF/NOPB uses internally compensated voltage-mode control for the DC-DC converter and does not require external compensation networks. Its LILO and LDO stages are also fully integrated with internal compensation. Only standard input/output ceramic capacitors (e.g., 4.7 µF at VBATT, 2.2 µF at VOUT_LILO, 1 µF at VOUT_LDO) and a single external inductor are required for full operation.
How does the LM3686TLX-AAEF/NOPB handle power sequencing between its three outputs?
The LM3686TLX-AAEF/NOPB supports flexible sequencing via three independent enable pins: EN_DCDC, EN_LILO, and EN_LDO. For example, enabling EN_DCDC first establishes the DC-DC output, then asserting EN_LILO configures LILO to draw from that rail (enabling 350 mA mode). EN_LDO may be asserted independently at any time. This eliminates external sequencing ICs and simplifies firmware-controlled power-up/down sequences.
What is the purpose of the QGND pin on the LM3686TLX-AAEF/NOPB?
The QGND (Quiet Ground) pin on the LM3686TLX-AAEF/NOPB serves as the dedicated return path for the LDO and LILO analog reference circuitry. It is physically and electrically isolated from PGND (Power Ground) to prevent switching noise from the DC-DC stage from coupling into noise-sensitive linear regulator outputs - directly enabling the 6.7 µVRMS LDO noise and 85 dB PSRR performance specified in the datasheet.
Can the LM3686TLX-AAEF/NOPB operate from a 3.3 V supply?
Yes, the LM3686TLX-AAEF/NOPB operates across 2.7 V to 5.5 V input, so a 3.3 V supply is fully supported. However, output voltage selection must respect minimum headroom requirements: for the LILO rail, VBATT must be ≥ (VOUT_LILO + 1.5 V); for the LDO, VIN_LDO = VBATT must be ≥ (VOUT_LDO + 0.3 V). At 3.3 V input, maximum supported outputs are ~1.8 V for LILO and ~3.0 V for LDO.
LM3686TLX-AAEF/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-WFBGA
- 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:
- 1.8V, 600mA
- Voltage/Current - Output 2:
- 1.2V, 350mA
- Voltage/Current - Output 3:
- 3V, 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
LM3686TLX-AAEF/NOPB FAQ
1.How can I place an order for LM3686TLX-AAEF/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3686TLX-AAEF/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 LM3686TLX-AAEF/NOPB reliable?
The price and inventory of LM3686TLX-AAEF/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3686TLX-AAEF/NOPB is usually 5 days.
3.What payment methods are accepted for LM3686TLX-AAEF/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3686TLX-AAEF/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3686TLX-AAEF/NOPB?
LM3686TLX-AAEF/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3686TLX-AAEF/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 LM3686TLX-AAEF/NOPB?
For technical support, including LM3686TLX-AAEF/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3686TLX-AAEF/NOPB requirements.
6.How does Aetrix verify that LM3686TLX-AAEF/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3686TLX-AAEF/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 LM3686TLX-AAEF/NOPB meets industry standards.
7.What is the process for return or replacement of LM3686TLX-AAEF/NOPB?
All LM3686TLX-AAEF/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3686TLX-AAEF/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 LM3686TLX-AAEF/NOPB part is unused and in its original packaging.
Return procedure for LM3686TLX-AAEF/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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