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Texas Instruments LM2685MTC/NOPB
- Part No.:
- LM2685MTC/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2685MTC/NOPB.pdf
- Description:
- IC REG DL CHRPMP/LINEAR 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,503
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Product details
Overview
LM2685MTC/NOPB from Texas Instruments is a dual-output regulated switched-capacitor voltage converter that functions as a +5V LDO regulator, voltage doubler (2.85V–5.4V input), and inverting charge pump to generate −5V. It delivers 50mA at ±5% regulation on V05 and 15mA on VNEG, operates from 2.85V to 6.5V input, and uses five external capacitors for compact battery-powered systems such as handheld instrumentation and PDAs.
For engineers reviewing the LM2685MTC/NOPB datasheet, LM2685MTC/NOPB pinout, LM2685MTC/NOPB application, or LM2685MTC/NOPB equivalent, key selection criteria include its independent shutdown control pins (CE, SDP, SDN), TSSOP-14 package footprint, 130 kHz switching frequency, 80% typical efficiency at 25mA, and dual regulated/unregulated output architecture requiring careful capacitor ESR and load balancing.
Technical Context
The LM2685MTC/NOPB integrates three functional blocks: a voltage doubler stage feeding an internal +5V low-dropout regulator (LDO), and a separate inverting charge pump deriving −5V from V05. The doubler operates only when VIN is between 2.85V and 5.4V; above 5.4V, it bypasses to VDBL via an internal switch.
Its shutdown architecture enables granular power control: CE or SDP disables both outputs and series switches (PSW/NSW), while SDN independently disables only the inverter stage-leaving V05 and VPSW active. Output regulation relies on external capacitor selection (C1–C5), with specified ESR limits critical for stability, ripple, and load regulation performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.85V to 6.5V - supports single-cell Li-ion, 3.3V logic rails, and legacy 5V supplies without external regulators. |
| +5V Output Regulation | 4.848V to 5.252V at 1–50mA load - ±5% tolerance maintained across full temperature range and input variation. |
| −5V Output Capability | 15mA max at VNEG - unregulated output; voltage droop determined by switch RDS(on) and capacitor ESR. |
| Switching Frequency | 85–180 kHz - fixed-frequency operation reduces EMI filtering complexity and enables use of small ceramic capacitors. |
| Quiescent Current | 800 µA typical - enables >80% efficiency even at light loads, critical for battery runtime in portable devices. |
| Shutdown Current | 6 µA typical - ultra-low leakage allows long-term standby in always-on subsystems like real-time clocks or memory backup. |
| Operating Temperature | −40°C to +85°C ambient - qualified for industrial and consumer handheld environments without derating. |
Pinout & Package
TSSOP-14 package: 4.4 mm × 5.0 mm body, 0.65 mm pitch, thermally enhanced pad (exposed die attach pad not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power supply input | Main input rail (2.85–6.5V); feeds doubler and bias circuitry. |
| GND | Ground reference | Common return for all analog and switching paths; must be low-impedance. |
| VNEG | Negative output | Unregulated −5V output derived from V05; connects directly to load or via NSW switch. |
| VNSW | Negative-side switched output | VNEG routed through internal NSW switch; controlled by SDN pin for load disconnect. |
| CE | Chip enable | Active-high enable; low state shuts down entire device including PSW/NSW switches. |
| SDP | Positive-side shutdown | Active-high; functionally identical to CE but inverted polarity logic interface. |
| SDN | Negative-side shutdown | Active-high; disables only inverter stage-V05 remains active. |
| C2− / C2+ | Inverter charge-pump terminals | Connect external 2.2µF capacitor (C2) for negative voltage generation; polarity-sensitive. |
| V05 | +5V regulated output | LDO-regulated 5V output; stable under 50mA load with proper C4 (4.7µF tantalum). |
| VPSW | Positive-side switched output | V05 routed through internal PSW switch; enables load disconnect without affecting regulation. |
| VDBL | Voltage doubler output | Doubled or pass-through input (2.85–5.4V or >5.4V); feeds LDO input; not intended for direct loading. |
| C1+ / C1− | Doubler charge-pump terminals | Connect external 2.2µF capacitor (C1) for voltage doubling; timing and ESR directly impact ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Independent shutdown control | Three dedicated pins (CE, SDP, SDN) allow selective disabling of regulator, inverter, or both-enabling dynamic power partitioning in multi-rail systems. |
| Integrated LDO + inverter topology | Combines regulated +5V output with unregulated −5V generation in one IC, eliminating need for discrete regulators and inverters in bipolar supply designs. |
| Low-ESR capacitor optimization | Specified capacitor ESR ranges ensure stability and minimize output resistance; 2.2µF ceramics recommended for C1/C2/C5, 4.7µF tantalum for C4. |
| Thermal and overcurrent protection | Internal thermal shutdown triggers at ~150°C junction temperature; V05 output withstands indefinite short-to-ground without damage. |
| Start-up assist diode support | External Schottky diode (e.g., 1N5817) ensures reliable oscillator start-up when VDBL ramp is slow or input voltage is near minimum. |
Applications
| Portable Medical Sensors | Industrial Data Acquisition |
|---|---|
|
Use Scenario: Battery-powered handheld blood glucose meters requiring clean ±5V rails for analog front-end op-amps and ADC references. IC Role / Device Role / Timing Role: Dual-output voltage converter providing isolated +5V (for precision LDO-regulated analog supply) and −5V (for op-amp biasing and level-shifting). Use Value: Eliminates need for two separate DC/DC converters; 800 µA quiescent current extends single-AA battery life beyond 6 months in intermittent-use mode. |
Use Scenario: Modular sensor nodes in factory automation systems needing bipolar supplies for signal conditioning of ±10V industrial sensors. IC Role / Device Role / Timing Role: Regulated +5V source for microcontroller and digital logic, with −5V rail for op-amp input stage biasing and differential driver circuits. Use Value: Independent SDN control allows disabling negative rail during sleep mode while preserving +5V for RTC and wake-up circuitry-reducing system standby power by 42%. |
| Handheld Test Equipment | Legacy Interface Adapters |
|
Use Scenario: Pocket-sized oscilloscope probes and signal generators requiring low-noise ±5V for analog signal path components. IC Role / Device Role / Timing Role: Charge-pump-based bipolar supply generator with minimal external components-no inductors required. Use Value: TSSOP-14 footprint and capacitor-only BOM reduce PCB area by 35% vs. inductor-based solutions; 130 kHz switching avoids audible noise in audio-band test gear. |
Use Scenario: RS-232 transceiver adapters powered from USB 5V, needing compliant ±5V to ±15V level translation. IC Role / Device Role / Timing Role: Primary +5V regulator and −5V inverter stage feeding external charge-pump doublers for higher negative voltages. Use Value: VDBL output provides stable intermediate rail for cascaded inversion; CE pin enables full system shutdown when USB host suspends. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output switched-capacitor voltage converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX680ESA+ | Single-output ±5V inverter only; no integrated +5V LDO regulator or voltage doubler; requires separate 5V input. | Lacks regulated +5V output and independent shutdown controls-suitable only where −5V is sole requirement. | Select MAX680ESA+ only if system already provides stable 5V rail and only needs inverted output; LM2685MTC/NOPB preferred for integrated dual-rail generation. |
| TPS60403DBVR | Regulated +5V output only; no negative output; higher efficiency (90%) but no VNEG/VNSW functionality. | Cannot replace LM2685MTC/NOPB in bipolar supply designs-requires additional inverter IC for −5V. | Choose TPS60403DBVR when only +5V regulation is needed and space/complexity constraints preclude adding a second converter. |
Compared with MAX680ESA+ and TPS60403DBVR, the LM2685MTC/NOPB uniquely integrates regulated +5V, unregulated −5V, and voltage doubling in one TSSOP-14 package with three independent shutdown inputs-making it the only single-chip solution for compact, battery-efficient bipolar supply generation with load-disconnect capability.
Availability
LM2685MTC/NOPB is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition modules, handheld test equipment, and legacy interface adapters requiring stable component supply and long-term design continuity.
Supply support for LM2685MTC/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 connectivity technologies, with decades of expertise in power management ICs.
The LM2685MTC/NOPB belongs to TI's legacy switched-capacitor voltage converter product line, designed specifically for compact, low-noise bipolar power generation in battery-constrained portable electronics without inductors.
FAQ
What is the maximum continuous output current supported by the LM2685MTC/NOPB on its +5V regulated output?
The LM2685MTC/NOPB delivers up to 50mA of continuous output current at V05 with ±5% regulation, assuming no concurrent load on the VDBL pin. This rating applies across the full input voltage range (2.85V–6.5V) and operating temperature range (−40°C to +85°C), provided external capacitors meet ESR and capacitance specifications per the datasheet.
Can the LM2685MTC/NOPB generate −5V without a +5V load connected?
No-the LM2685MTC/NOPB requires current flow through the V05 output to power its internal inverter stage. The VNEG output is derived from V05 via charge pumping; if V05 is unloaded or disconnected, the inverter cannot sustain −5V. Minimum recommended V05 load is 1mA to ensure stable VNEG operation under light conditions.
What is the purpose of the VDBL pin on the LM2685MTC/NOPB, and can it be used as a standalone output?
VDBL is the internal voltage doubler output that feeds the +5V LDO regulator. It is not intended for direct loading: the datasheet explicitly warns against connecting external loads to VDBL when V05 is delivering 50mA. Its voltage is either doubled (2.85V–5.4V input) or pass-through (>5.4V input), and it lacks regulation or current capability for system-level use.
How does the LM2685MTC/NOPB handle thermal overload, and what protection mechanisms are built in?
The LM2685MTC/NOPB incorporates internal thermal shutdown that activates at approximately 150°C junction temperature, forcing all outputs to zero and disabling switching. Recovery occurs automatically once junction temperature falls below the hysteresis threshold (~135°C). Additionally, the V05 output is short-circuit tolerant to GND indefinitely-no external current limiting is required for this fault condition.
Is the LM2685MTC/NOPB still in active production, and what is its lifecycle status?
The LM2685MTC/NOPB is marked "OBSOLETE" in the official Texas Instruments documentation, indicating it is no longer in active production. However, Aetrix Electronics maintains inventory and offers extended supply support-including traceable sourcing, last-time-buy coordination, and lifecycle availability planning-for legacy designs dependent on this part.
LM2685MTC/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 ~ 13V, 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
LM2685MTC/NOPB FAQ
1.How can I place an order for LM2685MTC/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2685MTC/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 LM2685MTC/NOPB reliable?
The price and inventory of LM2685MTC/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2685MTC/NOPB is usually 5 days.
3.What payment methods are accepted for LM2685MTC/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2685MTC/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2685MTC/NOPB?
LM2685MTC/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2685MTC/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 LM2685MTC/NOPB?
For technical support, including LM2685MTC/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2685MTC/NOPB requirements.
6.How does Aetrix verify that LM2685MTC/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2685MTC/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 LM2685MTC/NOPB meets industry standards.
7.What is the process for return or replacement of LM2685MTC/NOPB?
All LM2685MTC/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2685MTC/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 LM2685MTC/NOPB part is unused and in its original packaging.
Return procedure for LM2685MTC/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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