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Microchip Technology TC7660COA
- Part No.:
- TC7660COA
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TC7660COA.pdf
- Description:
- IC REG CHARG PUMP INV 20MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,200
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Product details
Overview
TC7660COA from Microchip Technology is a charge pump voltage converter IC that inverts +1.5V to +10V input to corresponding -1.5V to -10V output using only two external capacitors-no inductor required. It features 99.9% typical voltage conversion efficiency, 80 µA typical supply current at 5V, and operates with a nominal 10 kHz internal oscillator. It serves as a pin-compatible replacement for the industry-standard 7660 in RS-232 negative power supplies and data acquisition systems.
For engineers reviewing the TC7660COA datasheet, TC7660COA pinout, TC7660COA application, or TC7660COA equivalent, key selection considerations include its SOIC-8 commercial-grade package (0°C to +70°C), low-quiescent-current operation, absence of external diode requirement, and compatibility with simple ±5V dual-supply generation from a single +5V rail.
Technical Context
The TC7660COA implements a two-phase switched-capacitor inverter topology with internal CMOS switches and an RC oscillator. Its output behaves as a non-regulated negative voltage source with series resistance (70 Ω typ at 25°C), linearly degrading with load current. The LV pin enables stable operation below 3.5V input by grounding, while the OSC pin allows external capacitor-based frequency adjustment down to sub-10 kHz.
It requires no external diodes for high-voltage inversion and supports cascading or paralleling for extended voltage multiplication or reduced output impedance. Output ripple and droop are directly governed by external capacitor ESR and values, not internal regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +1.5V to +10V - supports direct use from common logic rails including 1.8V, 3.3V, and 5V systems |
| Output Voltage | -VIN (inverting mode) - delivers matched negative output without regulation; e.g., +5V → -5V (open-load) |
| Oscillator Frequency | 10 kHz nominal - fixed internal frequency; adjustable downward via OSC pin capacitor |
| Supply Current | 80 µA typ @ VIN = 5V - enables ultra-low-power negative bias generation in battery-sensitive designs |
| Output Source Resistance | 70 Ω typ @ 25°C - defines load-induced voltage drop: ΔV = ILOAD × ROUT |
| Conversion Efficiency | 99.9% typ voltage efficiency, 98% typ power efficiency - minimizes heat rise and input current draw |
| ESD Protection | ≥3 kV HBM - enhances robustness in handling and board-level assembly environments |
Pinout & Package
TC7660COA is housed in an 8-pin narrow SOIC (SOIC-N) package, 3.90 mm body width, compliant with JEDEC MS-012, Pb-free matte tin finish. Pin 1 is marked with a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No connection | Internally unconnected; must remain floating - no routing or soldering required |
| 2 (CAP+) | Flying capacitor positive terminal | Connects to positive lead of charge pump capacitor (C1); polarity critical for polarized types |
| 3 (GND) | Ground reference | Common return for input, output, and internal circuitry; requires low-inductance PCB tie to system ground plane |
| 4 (CAP-) | Flying capacitor negative terminal | Connects to negative lead of C1; reverse polarity causes functional failure or damage |
| 5 (VOUT) | Negative output terminal | Delivers inverted voltage; connects to negative reservoir capacitor (C2) and load return |
| 6 (LV) | Low-voltage enable control | Must be tied to GND when VIN < 3.5V; left open otherwise - ensures oscillator stability across full input range |
| 7 (OSC) | Oscillator frequency control | Bypass to GND with external capacitor to reduce frequency; optional external clock input for synchronization |
| 8 (V+) | Positive supply input | Accepts +1.5V to +10V; requires local 0.1 µF ceramic bypass capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Voltage inversion without inductors | Enables compact, EMI-clean negative rail generation in space-constrained layouts where magnetics are prohibited |
| Only two external capacitors required | Reduces BOM count, layout area, and cost versus inductor-based DC/DC converters or discrete charge-pump solutions |
| Pin-compatible with industry-standard 7660 | Allows drop-in replacement in legacy designs without PCB revision or firmware changes |
| Internal oscillator with external frequency tuning | Permits optimization of capacitor size vs. ripple trade-off: lower fOSC → larger caps, higher fOSC → smaller caps and tighter ripple control |
| No external diode needed for high-voltage operation | Eliminates forward-drop loss and thermal stress associated with external diode-based inverters, improving efficiency above 5V |
Applications
| RS-232 Transceiver Bias Supply | Data Acquisition System Dual Rail |
|---|---|
Use Scenario: Providing -5V to RS-232 line drivers (e.g., MAX232 interface ICs) from a single +5V microcontroller supply. IC Role / Device Role / Timing Role: Charge pump inverter generating unregulated negative rail; no timing-critical interaction with serial data stream. Use Value: Eliminates need for isolated DC/DC or transformer-based negative supply, reducing component count and board area by >40% versus discrete solutions. | Use Scenario: Powering ±5V op-amps and ADC front-ends in portable instrumentation where dual-rail analog signal conditioning is required. IC Role / Device Role / Timing Role: Negative voltage generator supporting rail-to-rail input stages; operates continuously during measurement cycles. Use Value: Delivers stable -5V at up to 20 mA with <150 mV droop, enabling accurate 12-bit ADC reference performance without dedicated negative LDO. |
| Industrial Sensor Signal Conditioning | Legacy Embedded Controller Support |
Use Scenario: Supplying -12V bias to piezoelectric sensor amplifiers in vibration monitoring modules operating from 3.3V system rails. IC Role / Device Role / Timing Role: Inverting +3.3V to -3.3V (scalable via cascading), used in analog front-end stage prior to signal digitization. Use Value: Achieves -3.3V output with <100 mV ripple at 5 mA load using 10 µF X7R ceramics, meeting SNR requirements for 16-bit sigma-delta ADCs. | Use Scenario: Retrofitting obsolete 7660-based power sections in field-deployed PLC I/O modules requiring long-term component continuity. IC Role / Device Role / Timing Role: Direct pin-for-pin functional replacement maintaining identical external component values and layout. Use Value: Enables seamless obsolescence mitigation with zero redesign effort, leveraging same test fixtures and qualification data as original 7660 design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar charge pump inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1044CPA+ | Same 8-pin PDIP/SOIC footprint; 10 kHz oscillator; requires external diode for >5V operation | Higher forward-drop losses reduce efficiency above 5V; less suitable for battery-powered 5V systems | Select MAX1044CPA+ only if existing design uses diode-based topology and layout cannot accommodate TC7660COA's diode-free operation |
| ICL7660ACPAZ | Pin-compatible but rated for -40°C to +85°C (E-temp); identical electrical specs except wider temp range | Not qualified for commercial-only applications; over-spec'd thermal rating increases cost unnecessarily | Choose ICL7660ACPAZ only when extended temperature operation is mandatory; TC7660COA is optimal for 0°C–70°C industrial and consumer use |
Compared with MAX1044CPA+ and ICL7660ACPAZ, the TC7660COA offers superior power efficiency at 5V input due to its integrated diode-free architecture, lower quiescent current for battery longevity, and precise commercial-temperature binning-making it the most cost-effective and thermally optimized choice for standard embedded applications.
Availability
TC7660COA is available at Aetrix Electronics and suitable for RS-232 interface design, portable data acquisition systems, and industrial sensor signal conditioning requiring stable component supply and long-term manufacturing continuity.
Supply support for TC7660COA 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 wafer fabrication and packaging facilities.
The TC7660 product line was designed specifically for low-cost, inductorless DC/DC voltage inversion in cost-sensitive industrial, communications, and instrumentation applications-prioritizing simplicity, reliability, and drop-in compatibility with legacy 7660 designs.
FAQ
What is the maximum input voltage supported by the TC7660COA?
The TC7660COA supports a maximum continuous input voltage of +10V, with absolute maximum rating at +10.5V. Operation beyond +10V risks permanent damage. At +10V input, it delivers approximately -10V output under no-load conditions, with output droop scaling linearly per the 70 Ω typical output resistance. Always observe derating guidelines in DS21465C Section 1.0 for reliability across temperature.
Does the TC7660COA require external diodes for operation?
No, the TC7660COA does not require external diodes for standard voltage-inverting operation across its full +1.5V to +10V input range. Its internal CMOS switch matrix eliminates forward-voltage drop and associated power loss. External diodes are only needed for specialized configurations like positive voltage multiplication (per Figure 5-6 in DS21465C), not for basic inversion.
How does the LV pin affect TC7660COA functionality?
Pin 6 (LV) must be connected to GND when the input voltage (V+) is below 3.5V to ensure reliable oscillator startup and stable switching. If left floating or tied high at V+ < 3.5V, the device may fail to oscillate or exhibit erratic output. For V+ ≥ 3.5V, LV should remain open - incorrect LV configuration is a leading cause of no-output failures in prototype builds.
Can multiple TC7660COA devices be paralleled to increase output current?
Yes, TC7660COA devices can be paralleled to reduce effective output resistance and increase deliverable current. Per DS21465C Section 5.2, paralleling n units reduces ROUT by ~1/n. Each unit requires its own flying capacitor (C1), but a single shared reservoir capacitor (C2) suffices - scaled upward by n× to maintain ripple performance. Synchronization via OSC pin is recommended to avoid beat frequencies.
What is the purpose of the OSC pin on the TC7660COA?
The OSC pin (Pin 7) provides access to the internal oscillator node. Connecting an external capacitor to GND lowers the oscillator frequency below 10 kHz - useful for reducing switching losses and improving efficiency at light loads. Alternatively, driving OSC with an external CMOS clock synchronizes switching, eliminating beat frequencies in multi-rail systems. Never leave OSC floating; always tie to GND via capacitor or drive actively.
TC7660COA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Ratiometric
- Output Configuration:
- Positive or Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.5V
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 20mA
- Frequency - Switching:
- 10kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TC7660COA FAQ
1.How can I place an order for TC7660COA through Aetrix?
Please submit a Request for Quotation (RFQ) for TC7660COA 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 TC7660COA reliable?
The price and inventory of TC7660COA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC7660COA is usually 5 days.
3.What payment methods are accepted for TC7660COA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC7660COA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC7660COA?
TC7660COA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC7660COA 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 TC7660COA?
For technical support, including TC7660COA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC7660COA requirements.
6.How does Aetrix verify that TC7660COA is sourced from the original manufacturer or authorized distributors?
All TC7660COA 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 TC7660COA meets industry standards.
7.What is the process for return or replacement of TC7660COA?
All TC7660COA units undergo pre-shipment inspection (PSI). If there is an issue with TC7660COA, 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 TC7660COA part is unused and in its original packaging.
Return procedure for TC7660COA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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