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Texas Instruments LM2686MTC/NOPB
- Part No.:
- LM2686MTC/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2686MTC/NOPB.pdf
- Description:
- IC REG DL CHRPMP/LINEAR 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,622
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Product details
Overview
LM2686MTC/NOPB from Texas Instruments is a regulated switched-capacitor voltage converter that functions as both an input voltage doubler and a +5V LDO regulator, supporting 2.85V–6.5V input, delivering up to 50mA at ±5% regulation, and operating at 130kHz with 82% typical efficiency at 25mA - used in portable battery-powered instrumentation requiring compact 3.3V-to-5V conversion.
For engineers reviewing the LM2686MTC/NOPB datasheet, LM2686MTC/NOPB pinout, LM2686MTC/NOPB application, or LM2686MTC/NOPB equivalent, key selection considerations include its dual-mode operation (doubler + LDO), independent CE/SD shutdown control, TSSOP-14 package footprint, and VPSW load-disconnect switch functionality.
Technical Context
The LM2686MTC/NOPB integrates two functional blocks: a CMOS charge-pump voltage doubler (VDBL output) and a low-dropout linear regulator (V05 output). The doubler operates across 2.85V–5.4V input to generate up to 10.8V at VDBL, while above 5.4V it bypasses via internal switch; VDBL feeds the LDO stage, which regulates to +5V at V05 with 4.797–5.303V tolerance over full load and temperature.
Shutdown is implemented via complementary logic inputs: CE (active-high) and SD (active-high), each disabling all circuitry and opening the PSW series switch between V05 and VPSW. The device draws only 450µA quiescent current and 6µA in shutdown, enabling long battery life in handheld systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.85V to 6.5V - supports single-cell Li-ion, 3.3V rails, and wide-input portable systems without external regulators. |
| Regulated Output | +5.0V ±5% at up to 50mA - stable LDO output for logic, analog, or interface ICs requiring precise 5V supply. |
| Switching Frequency | 130kHz typical - balances capacitor size, ESR impact, and ripple; enables use of small 2.2µF ceramic/tantalum caps. |
| Conversion Efficiency | 82% typical at 25mA - minimizes power loss and thermal rise in space-constrained battery applications. |
| Quiescent Current | 450µA - ensures >1-year standby in low-duty-cycle portable devices powered by coin cells or small Li-ion packs. |
| Shutdown Current | 6µA typical - enables deep-sleep modes with negligible battery drain during system idle periods. |
| Operating Temperature | −40°C to +85°C ambient - validated for industrial and consumer handheld environments including PDAs and test gear. |
Pinout & Package
LM2686MTC/NOPB is housed in a 14-pin Thin Shrink Small Outline Package (TSSOP) with exposed pad (not electrically connected), optimized for thermal dissipation and PCB area efficiency in portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1, 7) | Power supply input | Must be tied together; accepts 2.85–6.5V input - feeds both doubler and LDO stages. |
| GND (Pins 2, 3, 4) | Power ground | All three must be shorted; provides return path for charge pump and regulator currents. |
| CE | Chip enable (active-high) | Drives device into shutdown when low; opens PSW switch disconnecting V05 from VPSW. |
| SD | Shutdown input (active-high) | Complementary to CE - high disables all blocks and opens PSW; allows flexible control logic routing. |
| V05 | +5V regulated output | Main LDO output; supplies loads directly or via VPSW; requires ≥1µF output capacitor (4.7µF tantalum recommended). |
| VPSW | V05 through series switch | Enables load disconnect - PSW opens during shutdown, isolating downstream circuitry from V05 rail. |
| VDBL | Doubled voltage output | Unregulated output of charge pump (up to 10.8V); feeds LDO input - must not be loaded concurrently with 50mA at V05. |
| C1+, C1− | Charge-pump capacitor terminals | Connect external 2.2µF capacitor (low-ESR); defines switching energy transfer and ripple performance. |
| NC (Pins 8, 9) | No connection | Not bonded internally - must remain unconnected on PCB to avoid parasitic coupling or latch-up risk. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode voltage conversion | Operates as both voltage doubler (VDBL) and +5V LDO regulator (V05), eliminating need for separate boost + LDO ICs. |
| Independent shutdown control | Separate CE (active-high) and SD (active-high) pins allow flexible system-level power sequencing and fault recovery. |
| VPSW load-disconnect switch | Internal MOSFET switch between V05 and VPSW enables true load isolation during shutdown - critical for leakage-sensitive circuits. |
| Low-quiescent-current operation | 450µA operating current enables >1000-hour runtime on 500mAh batteries in intermittent-use instrumentation. |
| TSSOP-14 package | 3.0mm × 4.4mm footprint with 0.65mm pitch - compatible with standard SMT assembly and reflow profiles. |
Applications
| Handheld Test Equipment | Medical Diagnostic Handhelds |
|---|---|
Use Scenario: Portable multimeters and signal generators requiring isolated 5V rail from 3.3V microcontroller supply. IC Role / Device Role / Timing Role: Regulated +5V power source for op-amps, ADC references, and display drivers. Use Value: Eliminates need for inductor-based DC/DC; 82% efficiency and 450µA IQ extend battery life between calibrations. |
Use Scenario: Battery-powered glucose meters and pulse oximeters needing clean, stable 5V for sensor bias and analog front-end. IC Role / Device Role / Timing Role: Precision LDO regulator supplying analog signal chain components with low noise and tight regulation. Use Value: ±5% output tolerance and <1.0% load regulation ensure consistent sensor excitation and measurement accuracy. |
| Industrial Data Loggers | Legacy Interface Adapters |
Use Scenario: Remote environmental sensors logging data over RS-232/RS-485 using 3.3V MCU but requiring 5V transceivers. IC Role / Device Role / Timing Role: Compact 3.3V-to-5V converter powering level-shifting and communication ICs. Use Value: TSSOP-14 footprint fits dense PCB layouts; VPSW isolation prevents backfeed during MCU sleep states. |
Use Scenario: USB-to-serial adapters bridging modern 3.3V hosts to legacy 5V UART peripherals. IC Role / Device Role / Timing Role: Voltage translation block generating compliant 5V VCC for MAX232-style transceivers. Use Value: 50mA output capacity supports multiple transceiver channels; 130kHz switching avoids EMI in noise-sensitive comms paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar regulated switched-capacitor voltage converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX680ESA+ | Fixed +5V doubler only (no LDO regulation); 100kHz switching; 20mA max output; SO-8 package. | Lacks V05 regulation and VPSW disconnect - suitable only where unregulated 5V is acceptable and load current ≤20mA. | Select MAX680ESA+ only if system tolerates ±10% output variation and does not require load isolation. |
| TPS60403DBVR | Regulated +5V output; 600kHz switching; 60mA output; 2.7–5.5V input; SOT-23-6 package. | Higher frequency enables smaller capacitors but increases EMI sensitivity; no VPSW or dual shutdown inputs. | Choose TPS60403DBVR for ultra-compact designs needing higher current and simpler control, but without load-disconnect requirement. |
Compared with LM2686MTC/NOPB, MAX680ESA+ offers smaller footprint but sacrifices regulation accuracy and load isolation, while TPS60403DBVR delivers higher current and integration density at the cost of missing independent CE/SD control and VPSW functionality - making LM2686MTC/NOPB uniquely suited for systems demanding both precision 5V regulation and programmable load disconnect.
Availability
LM2686MTC/NOPB is available at Aetrix Electronics and suitable for handheld instrumentation, medical diagnostics, industrial data loggers, and legacy interface adapters requiring stable component supply and long-term design continuity.
Supply support for LM2686MTC/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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies since 1930.
The LM2686MTC/NOPB belongs to TI's legacy power management portfolio designed specifically for low-power, capacitor-based DC/DC conversion in space- and battery-constrained portable electronics.
FAQ
What is the primary function of the LM2686MTC/NOPB?
The LM2686MTC/NOPB is a regulated switched-capacitor voltage converter that operates as both a voltage doubler and a +5V LDO regulator. It accepts 2.85V–6.5V input and delivers up to 50mA at tightly regulated +5.0V (±5%) while integrating independent CE/SD shutdown control and a VPSW load-disconnect switch - making LM2686MTC/NOPB ideal for portable instrumentation where inductor-free 5V generation and power sequencing are required.
Can the LM2686MTC/NOPB operate from a 3.3V supply?
Yes, the LM2686MTC/NOPB supports input voltages from 2.85V to 6.5V, fully covering standard 3.3V logic rails. At VIN = 3.3V, it generates ~6.6V at VDBL (doubler output), which the internal LDO regulates to +5V at V05 with 82% typical efficiency and ±5% tolerance - confirming LM2686MTC/NOPB is well-suited for 3.3V-to-5V conversion in microcontroller-based systems.
What is the purpose of the VPSW pin on the LM2686MTC/NOPB?
The VPSW pin on the LM2686MTC/NOPB connects to V05 through an internal series switch (PSW). During normal operation, PSW is closed, allowing loads to be connected to either V05 or VPSW. When CE is low or SD is high, PSW opens - physically disconnecting downstream circuitry from the 5V rail. This feature enables true load isolation in LM2686MTC/NOPB-based designs, preventing backfeed and reducing system-level leakage during sleep modes.
What external capacitors are required for the LM2686MTC/NOPB?
The LM2686MTC/NOPB requires three external capacitors: two 2.2µF low-ESR capacitors (C1, C3) for the charge-pump doubler stage, and one 4.7µF tantalum capacitor (C2) at the V05 output. C1 connects between C1+ and C1− pins; C3 bridges VIN and VDBL; C2 connects between V05 (or VPSW) and GND. Using these values ensures specified 82% efficiency, <1.0% load regulation, and stable operation per the LM2686MTC/NOPB datasheet.
Is the LM2686MTC/NOPB still in production?
The LM2686MTC/NOPB is marked "OBSOLETE" in its official Texas Instruments documentation (SNVS057C, April 2013), indicating TI no longer manufactures or recommends it for new designs. However, Aetrix Electronics maintains verified legacy inventory with full traceability and supports continued use in maintenance, repair, and legacy production programs where form-fit-function compatibility with the original LM2686MTC/NOPB is required.
LM2686MTC/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Topology:
- Charge Pump (1), Linear (LDO) (1)
- Number of Outputs:
- 2
- Frequency - Switching:
- 130kHz
- Voltage/Current - Output 1:
- ±5V, 5.7V ~ 10.8V, 50mA
- Voltage/Current - Output 2:
- 5V, 50mA
- Voltage/Current - Output 3:
- -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 2.85V ~ 6.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
LM2686MTC/NOPB FAQ
1.How can I place an order for LM2686MTC/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2686MTC/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 LM2686MTC/NOPB reliable?
The price and inventory of LM2686MTC/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2686MTC/NOPB is usually 5 days.
3.What payment methods are accepted for LM2686MTC/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2686MTC/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2686MTC/NOPB?
LM2686MTC/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2686MTC/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 LM2686MTC/NOPB?
For technical support, including LM2686MTC/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2686MTC/NOPB requirements.
6.How does Aetrix verify that LM2686MTC/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2686MTC/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 LM2686MTC/NOPB meets industry standards.
7.What is the process for return or replacement of LM2686MTC/NOPB?
All LM2686MTC/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2686MTC/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 LM2686MTC/NOPB part is unused and in its original packaging.
Return procedure for LM2686MTC/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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