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Texas Instruments LM2686MTCX/NOPB
- Part No.:
- LM2686MTCX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2686MTCX/NOPB.pdf
- Description:
- IC REG DL CHRPMP/LINEAR 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,139
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Product details
Overview
LM2686MTCX/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 input voltages from +2.85V to +6.5V, delivering up to 50mA at ±5% regulation, with 130kHz switching frequency and 82% typical efficiency at 25mA - used in portable battery-powered instrumentation requiring compact, low-quiescent-power 3.3V-to-5V conversion.
For engineers reviewing the LM2686MTCX/NOPB datasheet, LM2686MTCX/NOPB pinout, LM2686MTCX/NOPB application, or LM2686MTCX/NOPB equivalent, key selection criteria include its dual-mode operation (doubler + LDO), independent CE/SD shutdown control, VPSW load-disconnect switch, TSSOP-14 package footprint, and compatibility with low-ESR ceramic/tantalum capacitors for minimal output ripple in space-constrained designs.
Technical Context
The LM2686MTCX/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 VIN = 2.85V–5.4V to generate ~2×VIN, and bypasses above 5.4V; VDBL feeds the LDO stage, which regulates to +5V with line/load regulation of ≤0.25%/V and ≤1.0% respectively.
It features dual independent shutdown controls: CE (active-high) and SD (active-high logic polarity inverted internally), both disabling all circuitry and opening the internal PSW switch between V05 and VPSW. Shutdown current is 6µA typical, operating quiescent current is 450µA, and thermal shutdown activates at TJ = 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +5.0V ±5% (regulated at V05, stable over 1–50mA load and VIN = 2.85–6.5V) |
| Input Voltage Range | +2.85V to +6.5V (supports single-cell Li-ion, 3.3V logic rails, and wide-battery systems) |
| Max Output Current | 50mA at V05 (with zero load on VDBL; combined V05+VDBL load must not exceed 50mA) |
| Switching Frequency | 130kHz typical (reduces output impedance and ripple; fixed-frequency operation) |
| Conversion Efficiency | 82% typical at 25mA (enables >80% efficiency across most loads, minimizing thermal rise) |
| Shutdown Current | 6µA typical (enables ultra-low-power sleep modes in portable devices) |
| Operating Temp Range | −40°C to +85°C ambient (suitable for industrial handhelds and consumer electronics) |
Pinout & Package
LM2686MTCX/NOPB is housed in a 14-pin Thin Shrink Small Outline Package (TSSOP) with exposed pad (not thermally enhanced per datasheet), requiring all VIN pins (1,7) tied together and all GND pins (2,3,4) connected to a common ground plane for stable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1, 7) | Power supply input | Primary input rail connection; both pins must be shorted externally to ensure low-impedance path and balanced current sharing |
| GND (Pins 2, 3, 4) | Power ground | Common return for internal switches and regulator; all three pins require low-inductance tie to PCB ground plane |
| CE | Chip enable input | Active-high digital control: high = normal operation, low = full shutdown + VPSW disconnect |
| SD | Shutdown input | Active-high logic-inverted control: high = shutdown + VPSW disconnect (complementary to CE) |
| V05 | +5V regulated output | Main LDO output; supplies regulated 5V to loads; requires ≥1µF output capacitor (4.7µF tantalum recommended) |
| VPSW | Load-disconnect output | V05 routed through internal PSW switch; enables software-controlled load isolation without external FET |
| VDBL | Doubled voltage output | Charge-pump output feeding LDO; not intended for direct loading when V05 delivers 50mA |
| C1+, C1− | Charge-pump capacitor terminals | Connect external 2.2µF low-ESR capacitor (C1); defines doubler energy transfer and ripple performance |
Key Features
| Feature | Design Value |
|---|---|
| Dual shutdown control (CE & SD) | Enables system-level power sequencing flexibility: CE for active-high enable, SD for active-high shutdown with inverted logic |
| VPSW load-disconnect switch | Provides hardware-level load isolation without external MOSFET - critical for leakage-sensitive battery backup circuits |
| Integrated LDO post-regulation | Delivers tight ±5% output tolerance and <1% load regulation, eliminating need for external linear regulator in 3.3V→5V applications |
| Low 450µA quiescent current | Extends battery life in always-on subsystems (e.g., real-time clocks, sensor bias rails) without sacrificing output capability |
| TSSOP-14 package | Compact 5mm × 4.4mm footprint with standard pitch (0.65mm), compatible with automated SMT assembly and reflow profiles |
Applications
| Handheld Test Equipment | Medical Point-of-Care Devices |
|---|---|
|
Use Scenario: Portable multimeter or oscilloscope probe powering requiring isolated 5V rail from 3.3V microcontroller supply. IC Role / Device Role / Timing Role: Regulated voltage converter generating clean +5V for analog front-end ICs and display drivers. Use Value: Eliminates need for inductor-based DC/DC; achieves <10mVpp ripple with 2.2µF/4.7µF capacitor set and fits sub-2cm² PCB area. |
Use Scenario: Battery-powered glucose meter or pulse oximeter needing reliable 5V for optical sensor bias and LCD backlight. IC Role / Device Role / Timing Role: Primary 3.3V-to-5V power converter with shutdown control synchronized to measurement cycles. Use Value: 6µA shutdown current extends shelf life; VPSW enables complete sensor power gating between readings. |
| Industrial Data Loggers | Wireless Sensor Nodes |
|
Use Scenario: Remote environmental monitor using AA batteries and 3.3V MCU, requiring 5V for RS-232 transceiver interface. IC Role / Device Role / Timing Role: Voltage translation and regulation block enabling legacy serial communication from low-voltage host. Use Value: Supports input down to 2.85V - maintains 5V output until battery reaches end-of-life (~2.9V cutoff). |
Use Scenario: Zigbee or BLE node powered by coin cell, needing burst-mode 5V for RF PA or sensor excitation. IC Role / Device Role / Timing Role: On-demand power converter activated only during transmission windows via CE pin. Use Value: 450µA operating current + 6µA shutdown ensures >1-year battery life at 10-second wake intervals. |
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; no VPSW or CE/SD control | Lacks regulation accuracy (±10%) and load-disconnect capability; suitable only for non-critical digital rail generation | Select when cost sensitivity outweighs regulation precision and system-level power control needs |
| TPS60403DBVR | Regulated +5V output; 550kHz switching; 60mA max; integrated soft-start; no VDBL or VPSW outputs | Higher efficiency at light loads but lacks independent load isolation and voltage-doubling flexibility | Prefer for new designs prioritizing EMI reduction and tighter transient response over dual-output versatility |
Compared with MAX680ESA+ and TPS60403DBVR, LM2686MTCX/NOPB uniquely combines regulated +5V output, voltage doubling, and hardware load disconnect in one TSSOP-14 package - enabling simpler BOMs in portable systems requiring both rail generation and power-gating capability.
Availability
LM2686MTCX/NOPB is available at Aetrix Electronics and suitable for handheld instrumentation, medical point-of-care devices, and industrial data loggers requiring stable component supply with long-lifecycle support despite TI's obsolete status.
Supply support for LM2686MTCX/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 ICs for industrial, automotive, and consumer markets.
The LM2686MTCX/NOPB belongs to TI's legacy switched-capacitor power converter family, designed specifically for compact, inductorless 3.3V-to-5V conversion in battery-powered portable electronics where board space and quiescent power are critical constraints.
FAQ
What is the primary function of the LM2686MTCX/NOPB?
The LM2686MTCX/NOPB is a regulated switched-capacitor voltage converter that operates as both an input voltage doubler and a +5V low-dropout (LDO) regulator. It accepts input voltages from +2.85V to +6.5V and delivers up to 50mA of regulated +5V output with ±5% tolerance. Its dual functionality enables flexible power architecture in space-constrained portable systems without requiring magnetic components.
Does the LM2686MTCX/NOPB support true shutdown with zero output leakage?
Yes - the LM2686MTCX/NOPB supports full shutdown with 6µA typical supply current when either CE is driven low or SD is driven high. In shutdown mode, all internal circuitry is disabled and the internal PSW switch opens, disconnecting V05 from VPSW. This ensures near-zero output leakage to downstream loads, making it suitable for battery-backed systems requiring ultra-low standby power.
Can the LM2686MTCX/NOPB generate both +5V and doubled voltage simultaneously?
No - the LM2686MTCX/NOPB cannot deliver full rated current from both V05 and VDBL simultaneously. The datasheet specifies that the sum of V05 and VDBL load currents must not exceed 50mA. When V05 supplies 50mA, VDBL must remain unloaded; VDBL is intended solely as the LDO input rail, not a secondary output. Attempting concurrent heavy loading risks regulation failure or thermal shutdown.
What capacitor values are required for stable operation of the LM2686MTCX/NOPB?
The LM2686MTCX/NOPB requires three external capacitors: C1 (2.2µF, low-ESR ceramic or tantalum) between C1+ and C1− for charge pumping; C3 (2.2µF) from VDBL to GND as doubler output filter; and C4 (4.7µF tantalum or ≥1µF ceramic) from V05 or VPSW to GND as LDO output capacitor. Using higher-ESR or undersized capacitors increases output ripple and reduces efficiency.
Is the LM2686MTCX/NOPB still recommended for new designs?
No - the LM2686MTCX/NOPB is marked OBSOLETE by Texas Instruments per the SNVS057C datasheet (rev April 2013). While functional and supported by Aetrix Electronics for legacy program continuity, TI recommends newer alternatives like the TPS60403 for new designs due to improved efficiency, lower noise, and active product support. LM2686MTCX/NOPB remains viable for repair, replacement, and long-lifecycle industrial maintenance.
LM2686MTCX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
LM2686MTCX/NOPB FAQ
1.How can I place an order for LM2686MTCX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2686MTCX/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 LM2686MTCX/NOPB reliable?
The price and inventory of LM2686MTCX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2686MTCX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2686MTCX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2686MTCX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2686MTCX/NOPB?
LM2686MTCX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2686MTCX/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 LM2686MTCX/NOPB?
For technical support, including LM2686MTCX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2686MTCX/NOPB requirements.
6.How does Aetrix verify that LM2686MTCX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2686MTCX/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 LM2686MTCX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2686MTCX/NOPB?
All LM2686MTCX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2686MTCX/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 LM2686MTCX/NOPB part is unused and in its original packaging.
Return procedure for LM2686MTCX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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