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Microchip Technology TCM680EOA
- Part No.:
- TCM680EOA
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TCM680EOA.pdf
- Description:
- IC REG CHARGE PUMP INV DL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,231
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Product details
Overview
TCM680EOA from Microchip Technology is a dual-output switched-capacitor charge pump converter that generates +2VIN and −2VIN from a single 2.0V–5.5V input, delivering ±10V from +5V logic or ±6V from a 3V lithium cell. It operates with 85% power conversion efficiency, 99% voltage conversion efficiency, and supports up to 10 mA per output with typical output source resistance of 140 Ω at +25°C. It is used in handheld instruments, LCD bias generation, and op-amp dual-supply systems.
For engineers reviewing the TCM680EOA datasheet, TCM680EOA pinout, TCM680EOA application, or TCM680EOA equivalent, this page delivers verified specifications, SOIC-8 package details, confirmed dual-pump operation, real-world load capability (10 mA per rail), and validated alternatives for industrial temperature-range charge pump replacement.
Technical Context
The TCM680EOA integrates two independent charge pump stages-positive-doubling and negative-inverting-driven by an internal 21 kHz oscillator. Its four-phase switching architecture enables simultaneous +2VIN and −2VIN generation without inductors, using only four external capacitors.
Each output features low-impedance regulation: ROUT+ and ROUT− are both typ. 140 Ω at VIN = 5V and TA = +25°C, degrading predictably with temperature and load. The device includes built-in overvoltage clamping (VIN ≤ 5.8V) and supports operation across −40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +2.0V to +5.5V - supports single-cell Li-ion (3V), alkaline stacks, and standard 5V logic rails. |
| Output Voltage | +2VIN and −2VIN - delivers ±10V from 5V input or ±6V from 3V input, no regulation loop required. |
| Max Output Current | 10 mA per rail - sufficient for biasing LCD segments, op-amps, and analog front-ends. |
| Oscillator Frequency | 21 kHz - fixed internal clock eliminates need for external timing components. |
| Power Efficiency | 85% typ. - minimizes thermal rise in space-constrained portable designs. |
| Voltage Conversion Efficiency | 99% typ. - near-ideal charge transfer enables high-ratio voltage doubling/inversion with minimal loss. |
| Operating Temperature | −40°C to +85°C - qualified for industrial and extended-temperature embedded applications. |
| Package | 8-pin SOIC (150 mil) - surface-mount compatible with standard reflow profiles and automated assembly. |
Pinout & Package
TCM680EOA is housed in an 8-pin plastic SOIC (150 mil body width), JEDEC MS-012 compliant, with 1.27 mm pitch and 3.91 mm × 4.90 mm footprint. Pin 1 is marked with a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 C1− | Flying capacitor negative terminal (Stage 1) | Connects to negative side of first charge pump capacitor; polarity-critical for proper charge transfer. |
| 2 C2+ | Flying capacitor positive terminal (Stage 2) | Accepts charge from C1 during phase 1; forms voltage-doubling node with C2−. |
| 3 C2− | Flying capacitor negative terminal (Stage 2) | Completes second flying capacitor path; must observe polarity with polarized capacitors. |
| 4 VOUT− | Negative regulated output | Delivers −2VIN; requires low-ESR reservoir capacitor (C3) to minimize ripple under load. |
| 5 GND | Ground reference | Common return for input, flying caps, and both outputs; must be low-impedance PCB plane. |
| 6 VIN | Positive input supply | Accepts 2.0V–5.5V; bypassed with low-ESR capacitor to suppress switching noise. |
| 7 C1+ | Flying capacitor positive terminal (Stage 1) | Connects to VIN during phase 1; initiates charge transfer to C2 via internal switches. |
| 8 VOUT+ | Positive regulated output | Delivers +2VIN; requires low-ESR reservoir capacitor (C4); ripple <100 mV at 10 mA with 10 µF/0.5Ω ESR. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-output charge pump | Simultaneously generates +2VIN and −2VIN from one input-eliminates need for separate inverters or doublers. |
| 4-capacitor solution | Only C1, C2 (flying), C3, C4 (reservoir) required-reduces BOM count, board area, and cost vs. inductor-based solutions. |
| Internal 21 kHz oscillator | No external clock or timing components needed-simplifies layout and improves reliability over RC-timed alternatives. |
| Low output source resistance | 140 Ω typ. per rail at +25°C-supports stable 10 mA loads without significant voltage droop. |
| Industrial temperature range | −40°C to +85°C operation-enables use in automotive infotainment, industrial sensors, and ruggedized handhelds. |
| Input overvoltage clamp | Limits VIN to 5.8V-protects internal switches from transient damage without external TVS diodes. |
Applications
| LCD Display Bias Generation | Operational Amplifier Dual Supply |
|---|---|
|
Use Scenario: Generating symmetric bias voltages for segment drivers in monochrome or grayscale LCD panels. IC Role / Device Role / Timing Role: Dual-rail charge pump providing stable ±10V from a 5V system rail to drive LCD common and segment electrodes. Use Value: Eliminates discrete inductor-based DC/DC converters, reducing EMI and enabling ultra-thin display modules. |
Use Scenario: Powering rail-to-rail op-amps in portable test equipment requiring clean ±5V or ±6V supplies. IC Role / Device Role / Timing Role: Low-noise dual-output voltage converter supplying isolated positive and negative rails for precision analog signal conditioning. Use Value: Delivers 10 mA per rail with <100 mV p-p ripple-sufficient for low-power op-amps without additional LDO post-regulation. |
| Handheld Instrument Power | Portable Cellular Phone Subsystem |
|
Use Scenario: Providing dual supplies for analog front-end ICs (e.g., ADC drivers, sensor interfaces) in battery-powered multimeters. IC Role / Device Role / Timing Role: Efficient charge pump converting 3V lithium cell output to ±6V rails for signal chain components. Use Value: 85% power efficiency extends battery life; SOIC-8 package allows compact placement near analog subsystems. |
Use Scenario: Generating bias voltages for RF power amplifier shutdown circuitry or camera module flash drivers. IC Role / Device Role / Timing Role: Compact dual-rail generator supporting fast turn-on/off sequencing from main PMIC-controlled 3.3V or 5V bus. Use Value: Internal 21 kHz oscillator ensures predictable startup timing; no external clock skew or jitter concerns. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output charge pump applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX680ESA+ | Same 8-pin SOIC package; 45 kHz oscillator; 10 mA per rail; requires 5 external caps (vs. 4 for TCM680EOA). | Higher switching frequency increases ripple but reduces capacitor size; less efficient at light loads. | Preferred when smaller flying caps are critical and higher-frequency noise is manageable. |
| ICL7660SCPAZ | Single-output (inverting only); PDIP/SOIC-8; 10 kHz oscillator; 20 mA max; no positive-doubling function. | Cannot replace TCM680EOA's dual-rail capability without adding a second IC or external circuitry. | Only suitable if only negative rail is needed and design can accommodate extra components or board area. |
Compared with MAX680ESA+ and ICL7660SCPAZ, the TCM680EOA uniquely delivers simultaneous +2VIN/−2VIN with only four external capacitors and industrial temperature support-making it optimal for space- and efficiency-constrained dual-rail systems where integration and reliability are prioritized over ultra-high switching frequency.
Availability
TCM680EOA is available at Aetrix Electronics and suitable for handheld instruments, LCD display bias generation, and operational amplifier dual-supply applications requiring stable component supply across industrial temperature ranges.
Supply support for TCM680EOA 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
Microchip Technology is a U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and power management ICs, with ISO/TS-16949 certified fabrication facilities.
The TCM680 product line was designed specifically for low-cost, inductorless dual-rail generation in portable and space-constrained electronics-targeting applications where efficiency, simplicity, and industrial-grade reliability outweigh programmability or wide-input flexibility.
FAQ
What is the maximum input voltage rating for the TCM680EOA?
The TCM680EOA has an absolute maximum input voltage rating of +5.8V. Exceeding this value risks permanent damage due to excessive internal current flow. The device includes internal clamping to limit VIN, but designers must ensure system-level transients and supply tolerances remain within this bound. For reliable operation, VIN should be maintained between +2.0V and +5.5V as specified in the DC characteristics table. This rating applies directly to the TCM680EOA and is validated across its −40°C to +85°C operating range.
Can the TCM680EOA generate regulated outputs?
The TCM680EOA provides unregulated voltage doubling and inversion: VOUT+ ≈ +2VIN and VOUT− ≈ −2VIN. Regulation requires external linear regulators such as the TC55 and TC59, as shown in Figure 5-3 of the datasheet. These regulators stabilize the TCM680EOA's outputs to precise values like +5V/−5V when fed from variable sources (e.g., discharging Li-ion cells). The TCM680EOA itself contains no feedback or error amplifier-its accuracy depends solely on input stability and capacitor selection.
What capacitor values are recommended for the TCM680EOA?
Microchip recommends 4.7 µF low-ESR electrolytic or tantalum capacitors for C1 and C2 (flying), and 10–22 µF for C3 and C4 (reservoir), rated ≥6 VDC (C1/C4) and ≥12 VDC (C2/C3). With 4.7 µF flying caps and 10 µF reservoir caps (0.5Ω ESR), the TCM680EOA achieves typ. 140 Ω output resistance and <100 mV p-p ripple at 10 mA load. Larger C1/C2 values reduce ROUT but increase ESR-related losses; larger C3/C4 reduce ripple but add cost and footprint.
Is the TCM680EOA pin-compatible with other Microchip charge pumps?
The TCM680EOA shares identical pinout and functionality with the TCM680COA, TCM680EPA, and TCM680CPA-differing only in temperature grade and package type. All variants use the same SOIC-8 (EOA/COA) or PDIP-8 (EPA/CPA) pin assignments and electrical behavior. However, it is not pin-compatible with unrelated charge pumps like the ICL7660 or MAX680, which feature different pin functions, oscillator frequencies, and capacitor requirements.
Does the TCM680EOA require external clocking or enable control?
No-the TCM680EOA operates autonomously with an internal 21 kHz oscillator and no enable pin. It begins switching immediately upon valid VIN application and draws only 0.5–3.0 mA quiescent current depending on input voltage and temperature. There is no provision for external clock synchronization, shutdown, or frequency adjustment. This simplifies system design but means the TCM680EOA cannot be dynamically disabled or synchronized to external timing signals.
TCM680EOA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Ratiometric
- Output Configuration:
- Positive and Negative (Dual Rail)
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 10mA
- Frequency - Switching:
- 21kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TCM680EOA FAQ
1.How can I place an order for TCM680EOA through Aetrix?
Please submit a Request for Quotation (RFQ) for TCM680EOA 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 TCM680EOA reliable?
The price and inventory of TCM680EOA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TCM680EOA is usually 5 days.
3.What payment methods are accepted for TCM680EOA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TCM680EOA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TCM680EOA?
TCM680EOA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TCM680EOA 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 TCM680EOA?
For technical support, including TCM680EOA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TCM680EOA requirements.
6.How does Aetrix verify that TCM680EOA is sourced from the original manufacturer or authorized distributors?
All TCM680EOA 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 TCM680EOA meets industry standards.
7.What is the process for return or replacement of TCM680EOA?
All TCM680EOA units undergo pre-shipment inspection (PSI). If there is an issue with TCM680EOA, 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 TCM680EOA part is unused and in its original packaging.
Return procedure for TCM680EOA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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