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Texas Instruments LM3686TLE-AAEF/NOPB
- Part No.:
- LM3686TLE-AAEF/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 12-WFBGA
- Datasheet:
-
LM3686TLE-AAEF/NOPB.pdf
- Description:
- IC REG TRPL BCK/LNR SYNC 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,204
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Product details
Overview
LM3686TLE-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 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 PWM switching and automatic PFM/PWM mode transition - optimized for powering core logic and RF/analog rails in portable Li-ion-powered devices.
For engineers reviewing the LM3686TLE-AAEF/NOPB datasheet, LM3686TLE-AAEF/NOPB pinout, LM3686TLE-AAEF/NOPB application, or LM3686TLE-AAEF/NOPB equivalent, key selection considerations include independent enable control per rail (EN_DCDC/EN_LILO/EN_LDO), <170 µVRMS LDO output noise (10 Hz–100 kHz), <30 mV load transient response on LILO, 2.5 µA shutdown current, and compatibility with compact 0402/0603 passive footprints for space-constrained mobile designs.
Technical Context
The LM3686TLE-AAEF/NOPB implements a voltage-mode synchronous buck controller with internal 350 mΩ PFET and 150 mΩ NFET, supporting post-regulation architectures where the DC-DC output feeds VIN_LILO while VIN_LDO connects directly to VBATT. Its dual-rail linear regulation uses separate quiet ground (QGND) and power ground (PGND) paths to isolate sensitive analog reference circuits from switching noise.
Three independent enable inputs (EN_DCDC, EN_LILO, EN_LDO) allow flexible power sequencing: LILO can operate standalone via small-NMOS path (≤50 mA) when DC-DC is off, or switch to large-NMOS path (≤350 mA) when both enables are asserted. The 0.5 V internal DC-DC reference and programmable 0.7 V–2.0 V LILO output (via external resistor divider on FB_DCDC) support precise low-voltage core supply generation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports single-cell Li-ion (2.7 V cutoff) and 3-cell NiMH/NiCd without external pre-regulation. |
| DC-DC Output Current | 600 mA max - sufficient for application processors or FPGAs requiring 1.2 V–2.5 V at high load. |
| Switching Frequency | 3 MHz typical - enables use of tiny 0.47 µH inductors and 10 µF ceramic output capacitors for minimal PCB area. |
| LILO Load Transient | ±30 mV peak - maintains stable 0.7 V–2.0 V core voltage during rapid CPU state transitions. |
| LDO Output Noise | 6.7 µVRMS (10 Hz–100 kHz) - meets stringent RF PLL and ADC reference supply requirements. |
| Shutdown Current | 2.5 µA typical - extends battery life in standby modes for always-on sensors or real-time clocks. |
| Thermal Resistance | RθJA = 80.9 °C/W - allows >300 mW continuous power dissipation in standard 2-layer FR4 without heatsinking. |
Pinout & Package
LM3686TLE-AAEF/NOPB is housed in a 12-pin DSBGA (YZR) package measuring 2.435 mm × 1.687 mm with 0.4 mm pitch. The package features separate PGND (power ground) and QGND (quiet ground) terminals to minimize coupling between switching and analog sections.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 PGND | Power Ground | Return path for DC-DC switch node current; must be connected to low-impedance ground plane under inductor. |
| A2 SW | Switch Node | Connection to internal PFET drain and NFET source; routes high di/dt current to external inductor. |
| A3 FB_DCDC | DC-DC Feedback Input | Sets DC-DC output voltage via external resistor divider; referenced to 0.5 V internal bandgap. |
| B1 VBATT | Main Power Input | Primary input for DC-DC and bias for LDO; requires local 4.7 µF ceramic decoupling. |
| B2 EN_LILO | LILO Enable Input | Active-high logic control (VIH ≥1.1 V); enables/disables LILO independently of other rails. |
| B3 EN_DCDC | DC-DC Enable Input | Active-high logic control (VIH ≥1.1 V); asserts internal PFET/NFET gate drivers and oscillator. |
| C1 VIN_LDO | LDO Input Supply | Must be tied to VBATT; provides bias for LDO reference and pass transistor driver circuitry. |
| C2 EN_LDO | LDO Enable Input | Active-high logic control (VIH ≥1.1 V); enables LDO output only when VIN_LDO is present. |
| C3 QGND | Quiet Ground | Reference ground for LDO error amplifier and bandgap; isolated from PGND to suppress switching noise. |
| D1 VOUT_LDO | LDO Output | Regulated 1.5 V–3.3 V output; delivers up to 300 mA with <120 mV dropout at full load. |
| D2 VOUT_LILO | LILO Output | Regulated 0.7 V–2.0 V output; delivers up to 350 mA with <80 mV dropout at full load. |
| D3 VIN_LILO | LILO Input Supply | Accepts either DC-DC output (post-regulation) or direct VBATT connection; determines LILO operating mode. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic PFM/PWM Mode Switching | Reduces quiescent current to 28 µA in light-load PFM mode while maintaining 3 MHz PWM stability above ~80 mA load. |
| Independent Rail Enables | EN_DCDC, EN_LILO, and EN_LDO allow precise sequencing - e.g., boot LILO first, then enable DC-DC for higher current. |
| Low-Noise LDO Architecture | 6.7 µVRMS output noise and 85 dB PSRR at 1 kHz enable clean power for RF transceivers and precision ADCs. |
| Post-Regulation Flexibility | VIN_LILO accepts DC-DC output or VBATT; enables LILO to serve as primary regulator (low-noise) or secondary (high-efficiency). |
| Integrated Soft-Start | 70 µs startup time prevents inrush current spikes during power-up; eliminates need for external soft-start circuitry. |
Applications
| Mobile Application Processor Core | RF Front-End Bias Supply |
|---|---|
Use Scenario: Powering ARM Cortex-A series CPU cores requiring dynamically scalable 0.8 V–1.2 V supply with fast transient response. IC Role / Device Role / Timing Role: LILO rail delivers tightly regulated low-voltage core supply; DC-DC provides efficient intermediate bus; LDO supplies I/O voltage. Use Value: ±30 mV LILO load transient ensures stable operation during burst-mode execution without voltage droop-induced timing errors. |
Use Scenario: Providing ultra-clean 2.8 V bias to LTE/5G power amplifiers and low-noise amplifiers in smartphone front-end modules. IC Role / Device Role / Timing Role: LDO rail supplies PA bias; QGND isolation and 6.7 µVRMS noise prevent AM-to-PM distortion and EVM degradation. Use Value: 85 dB PSRR at 1 kHz rejects switching noise from adjacent DC-DC stages, preserving RF signal integrity. |
| Portable Medical Sensor Hub | Handheld Test Instrument ADC Reference |
Use Scenario: Powering multi-sensor fusion systems (ECG, SpO₂, temperature) with simultaneous analog and digital processing. IC Role / Device Role / Timing Role: DC-DC powers microcontroller and digital logic; LILO powers analog front-end; LDO supplies reference voltage for SAR ADC. Use Value: Separate PGND/QGND paths and <1 mV line transient on LILO prevent sensor offset drift during battery voltage sag. |
Use Scenario: Delivering precision 3.0 V reference to 16-bit SAR ADCs in battery-operated handheld multimeters and oscilloscopes. IC Role / Device Role / Timing Role: LDO operates in fixed 3.0 V mode; its 0.2 mV/V line regulation minimizes reference voltage drift across battery discharge curve. Use Value: 0.01% output accuracy over temperature enables sub-LSB measurement stability without calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65136RGER | Single 3.3 V LDO + dual-channel charge pump; no integrated DC-DC buck stage; 150 mA LDO output. | Limited to low-power LCD bias and interface rails; cannot replace LM3686TLE-AAEF/NOPB's 600 mA DC-DC or LILO functionality. | Select only if system requires only auxiliary voltage translation and has separate main DC-DC converter. |
| TPS62748YFPR | Ultra-low-IQ (360 nA) single-output buck converter; no linear regulators; 400 mA output; 2.5 V–5.5 V input. | Optimized for long-life coin-cell applications; lacks multi-rail integration, noise-sensitive LDO, or LILO's sub-1 V capability. | Choose when battery life dominates over rail count and analog noise performance is not critical. |
Compared with TPS65136RGER and TPS62748YFPR, LM3686TLE-AAEF/NOPB uniquely integrates three regulated outputs - including a 0.7 V–2.0 V LILO with <30 mV transient response and a 6.7 µVRMS LDO - enabling complete power architecture consolidation in space-constrained portable electronics without sacrificing analog performance.
Availability
LM3686TLE-AAEF/NOPB is available at Aetrix Electronics and suitable for mobile TV power management, handheld radio RF biasing, portable medical sensor hubs, and battery-powered test instrumentation requiring stable component supply across extended production lifecycles.
Supply support for LM3686TLE-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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-efficiency DC-DC conversion and ultra-low-noise regulation.
The LM3686 product line was designed specifically for portable Li-ion-powered devices requiring tightly regulated, low-noise, and sequenced multi-rail power - addressing the needs of application processors, RF transceivers, and precision analog subsystems in space- and power-constrained environments.
FAQ
What is the maximum supported output voltage for the LILO rail in LM3686TLE-AAEF/NOPB?
The LILO rail of LM3686TLE-AAEF/NOPB supports an output voltage range of 0.7 V to 2.0 V, set by an external resistor divider connected to the FB_DCDC pin and referenced to the internal 0.5 V bandgap. This range is confirmed in the Electrical Characteristics table (Section 7.5) and applies across the full operating temperature range of –40°C to +85°C. The LM3686TLE-AAEF/NOPB does not support outputs above 2.0 V on the LILO rail.
Does LM3686TLE-AAEF/NOPB require external compensation components for the DC-DC loop?
No, LM3686TLE-AAEF/NOPB uses an internally compensated voltage-mode control architecture. The DC-DC converter does not require external compensation components - only the standard external components: input capacitor (4.7 µF), output capacitor (10 µF), and inductor (typically 0.47 µH). This is explicitly stated in the Typical Application schematic (Figure 2) and Section 9.2 of the datasheet.
Can LM3686TLE-AAEF/NOPB operate with VBATT below 2.7 V?
LM3686TLE-AAEF/NOPB has an absolute minimum recommended input voltage of 2.7 V per Section 7.3 (Recommended Operating Conditions). While undervoltage lockout releases at ~2.65 V, operation below 2.7 V is not guaranteed - output regulation, current capability, and transient response degrade significantly. The datasheet specifies 2.7 V as the lower bound for full specification compliance, and LM3686TLE-AAEF/NOPB should not be used below this voltage in production designs.
How does the LILO rail behave when EN_DCDC is low but EN_LILO is high in LM3686TLE-AAEF/NOPB?
When EN_DCDC is low and EN_LILO is high, LM3686TLE-AAEF/NOPB activates a small-NMOS pass device powered from VIN_LDO (VBATT), delivering up to 50 mA to VOUT_LILO. This mode is explicitly described in Section 5 (Description Continued) and Figure 10 (Start-up). It allows LILO to remain active for low-power functions even when the DC-DC stage is disabled - a key feature for partial-system wake-up scenarios.
What is the thermal performance of LM3686TLE-AAEF/NOPB in a standard 2-layer PCB layout?
In a standard 2-layer FR4 PCB with 1 oz copper and moderate copper pour, LM3686TLE-AAEF/NOPB exhibits a junction-to-ambient thermal resistance (RθJA) of 80.9 °C/W, as measured per JEDEC JESD51-7. At 300 mW power dissipation, this results in ~24°C junction-to-ambient rise - well within the 125°C maximum operating junction temperature. Layout guidelines in Section 11.1 emphasize connecting PGND pins directly to a solid ground plane to achieve this rating.
LM3686TLE-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
LM3686TLE-AAEF/NOPB FAQ
1.How can I place an order for LM3686TLE-AAEF/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3686TLE-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 LM3686TLE-AAEF/NOPB reliable?
The price and inventory of LM3686TLE-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 LM3686TLE-AAEF/NOPB is usually 5 days.
3.What payment methods are accepted for LM3686TLE-AAEF/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3686TLE-AAEF/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3686TLE-AAEF/NOPB?
LM3686TLE-AAEF/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3686TLE-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 LM3686TLE-AAEF/NOPB?
For technical support, including LM3686TLE-AAEF/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3686TLE-AAEF/NOPB requirements.
6.How does Aetrix verify that LM3686TLE-AAEF/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3686TLE-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 LM3686TLE-AAEF/NOPB meets industry standards.
7.What is the process for return or replacement of LM3686TLE-AAEF/NOPB?
All LM3686TLE-AAEF/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3686TLE-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 LM3686TLE-AAEF/NOPB part is unused and in its original packaging.
Return procedure for LM3686TLE-AAEF/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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