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Microchip Technology TC7660CPA
- Part No.:
- TC7660CPA
- Manufacturer:
- Microchip Technology
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
TC7660CPA.pdf
- Description:
- IC REG CHARG PUMP INV 20MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:343
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Product details
Overview
TC7660CPA from Microchip Technology is a CMOS charge pump voltage converter 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, 70 Ω typical output source resistance at +25°C, and operates with 80 µA typical supply current at VIN = 5V. It serves as a pin-compatible replacement for the industry-standard ICL7660 in RS-232 negative power supplies and data acquisition systems.
For engineers reviewing the TC7660CPA datasheet, TC7660CPA pinout, TC7660CPA application, or TC7660CPA equivalent, key selection considerations include its 8-pin PDIP package, commercial temperature range (0°C to +70°C), oscillator frequency adjustability via OSC pin, LV pin logic for low-voltage operation (<3.5V), and absence of external diode requirement for high-voltage inversion.
Technical Context
The TC7660CPA implements a two-phase switched-capacitor inverter architecture with an internal 10 kHz nominal oscillator. Its operation relies on charge transfer between CAP+ and CAP− flying capacitors, followed by delivery to VOUT through internal bidirectional CMOS switches.
It lacks regulation-output voltage drops linearly with load current-and models electrically as an ideal inverting source in series with a dynamic output resistance (ROUT) influenced by switching frequency, capacitor ESR, and switch on-resistance. The LV pin enables stable oscillation below 3.5V input by grounding, while the OSC pin accepts external timing capacitors or CMOS clocks to scale frequency from ~1 kHz to >100 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +1.5V to +10V - supports direct use from common logic rails (e.g., +3.3V, +5V) without pre-regulation |
| Output Voltage | -VIN (ideal) - delivers inverted output with slope ~150 Ω at V+ = +2V, ~55 Ω at V+ = +5V under load |
| Oscillator Frequency | 10 kHz (typ, pin 7 open) - adjustable downward via external capacitor on OSC pin for lower quiescent current |
| Voltage Conversion Efficiency | 99.9% (typ, no load) - minimizes input-to-output voltage loss in low-current instrumentation applications |
| Supply Current | 80 µA (typ, VIN = 5V, RL = ∞) - enables battery-powered portables and always-on sensor nodes |
| Output Source Resistance | 70 Ω (typ, 20 mA, +25°C) - defines load regulation error; decreases with parallel device use or higher fOSC |
| ESD Protection | ≥3 kV HBM - enhances robustness during PCB handling and system integration |
Pinout & Package
TC7660CPA is housed in an 8-pin plastic dual in-line package (PDIP), 300 mil body width, with standard through-hole mounting and 0°C to +70°C commercial temperature rating.
| 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-transfer capacitor; polarity critical for polarized types |
| 3 (GND) | Ground reference | Common return for input, output, and internal regulator - requires low-inductance layout |
| 4 (CAP−) | Flying capacitor negative terminal | Connects to negative lead of flying capacitor; reversed polarity relative to CAP+ during phase switching |
| 5 (VOUT) | Inverted output node | Delivers negative voltage; connects to reservoir capacitor and load - low-ESR cap recommended |
| 6 (LV) | Low-voltage oscillator enable | Must be tied to GND when V+ < 3.5V to ensure reliable startup and oscillation |
| 7 (OSC) | External oscillator control | Bypass with capacitor to GND to reduce frequency; accepts CMOS clock for synchronization |
| 8 (V+) | Positive supply input | Accepts +1.5V to +10V; bypass with low-ESR capacitor near pin for noise suppression |
Key Features
| Feature | Design Value |
|---|---|
| Voltage inversion without inductors | Eliminates EMI, size, and cost penalties of magnetic components - ideal for space-constrained PCBs |
| Two-capacitor operation | Reduces BOM count and layout complexity; supports 10 µF ceramic or tantalum capacitors |
| Adjustable oscillator frequency | Enables optimization of efficiency vs. ripple trade-off - lower fOSC cuts quiescent current, higher fOSC shrinks capacitor size |
| Pin compatibility with ICL7660 | Allows drop-in replacement in legacy designs without PCB revision or firmware changes |
| No external diode requirement | Simplifies high-voltage inversion (up to +10V) - internal switches handle full voltage swing |
Applications
| RS-232 Transceiver Power Supply | Data Acquisition System Bias |
|---|---|
Use Scenario: Generating -5V rail from existing +5V logic supply to meet RS-232 driver/receiver level requirements. IC Role / Device Role / Timing Role: Charge pump inverter providing isolated negative voltage; no timing-critical interface - operates asynchronously. Use Value: Enables single-supply RS-232 interfaces without dedicated negative regulators or transformers, reducing component count by ≥3 parts. | Use Scenario: Supplying precision op-amp bias and ADC reference rails in portable test equipment operating from +3.3V batteries. IC Role / Device Role / Timing Role: Low-noise negative voltage generator; output impedance directly impacts analog signal fidelity and offset stability. Use Value: 70 Ω ROUT and 80 µA quiescent current support microamp-level bias networks and extend battery life beyond 100 hours. |
| Industrial Sensor Signal Conditioning | Portable Medical Instrumentation |
Use Scenario: Creating symmetric ±5V supplies for bridge amplifier front-ends in vibration or pressure sensors deployed in factory environments. IC Role / Device Role / Timing Role: Dual-rail DC-DC converter; thermal stability over 0°C–70°C ensures consistent gain and offset across ambient shifts. Use Value: 3 kV HBM ESD rating protects against field-induced latch-up during maintenance, improving long-term reliability in unshielded enclosures. | Use Scenario: Powering low-power ECG front-end amplifiers requiring clean -2.5V reference in handheld diagnostic devices. IC Role / Device Role / Timing Role: Inverting regulator with minimal standby current; no clock synchronization needed - operates autonomously. Use Value: 99.9% voltage conversion efficiency preserves battery capacity during extended monitoring sessions (>8 hrs on coin cell). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar charge pump inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICL7660CPA | Legacy Intersil part; identical pinout and basic function but lower ESD (2 kV HBM) and no LV pin logic | Not suitable for V+ < 3.5V without external circuitry; less robust in handling ESD events during assembly | Select TC7660CPA when operating below 3.5V or requiring enhanced manufacturing ruggedness |
| MAX660CPA | Maxim part; same 8-pin PDIP, 1.5–5.5V input, but includes shutdown control and tighter ROUT spec (45 Ω typ) | Requires additional SHDN pin control; optimized for low-noise, regulated outputs - not pin-compatible | Choose MAX660CPA only if system demands active enable/disable or sub-50 Ω output impedance |
Compared with ICL7660CPA and MAX660CPA, TC7660CPA uniquely balances pin compatibility, low-voltage support via LV pin, and 3 kV ESD protection - making it optimal for cost-sensitive, industrial-grade replacements where board space and reliability are prioritized over shutdown functionality.
Availability
TC7660CPA is available at Aetrix Electronics and suitable for RS-232 transceiver power supplies, portable medical instrumentation, and industrial sensor signal conditioning requiring stable component supply across commercial temperature grades.
Supply support for TC7660CPA 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 company specializing in microcontrollers, analog devices, and power management ICs, with ISO/TS-16949 certified manufacturing.
The TC7660 product line was designed specifically for low-cost, inductorless voltage inversion in legacy and space-constrained systems - targeting RS-232, data acquisition, and portable instrumentation markets.
FAQ
What is the maximum input voltage supported by the TC7660CPA?
The TC7660CPA supports a maximum input voltage of +10V, with absolute maximum rating at +10.5V. Operation above +10V risks permanent damage. The device maintains stable inversion down to +1.5V input, and the LV pin must be grounded when V+ falls below 3.5V to ensure oscillator reliability. This range makes TC7660CPA suitable for both +5V and +3.3V logic systems without external level shifting.
Does the TC7660CPA require external diodes for voltage inversion?
No, the TC7660CPA does not require external diodes for standard voltage inversion. Its internal CMOS switch matrix handles bidirectional charge transfer across the flying capacitor, enabling clean -VIN output from +1.5V to +10V inputs. External diodes are only needed for specialized configurations like positive voltage multiplication (per Figure 5-6 in DS21465C), not for basic inverting operation - simplifying design and reducing BOM cost.
How does the LV pin affect TC7660CPA operation?
The LV pin on the TC7660CPA ensures reliable oscillator startup and operation when input voltage is below 3.5V. It must be connected to GND under those conditions; leaving it floating or connecting it to V+ will cause erratic or failed oscillation. At V+ ≥ 3.5V, the LV pin should remain unconnected (open). This behavior is explicitly defined in the Electrical Characteristics table and Pin Descriptions section of the TC7660CPA datasheet.
Can multiple TC7660CPA devices be paralleled to improve performance?
Yes, multiple TC7660CPA devices can be paralleled to reduce effective output source resistance (ROUT). Connecting N units in parallel lowers ROUT by approximately a factor of N, improving load regulation and output current capability. Each unit requires its own flying capacitor (C1), but they may share a single reservoir capacitor (C2), scaled upward in value to maintain ripple performance - as confirmed in Section 5.2 of the TC7660CPA datasheet.
What is the typical output source resistance of the TC7660CPA at room temperature?
The TC7660CPA exhibits a typical output source resistance (ROUT) of 70 Ω at +25°C with 20 mA load current. This value increases to 120 Ω at TA ≤ +70°C (C-suffix device) and further to 150 Ω at TA ≤ +125°C (M-suffix). ROUT is inversely proportional to oscillator frequency and flying capacitor quality - using larger or lower-ESR capacitors reduces effective ROUT, as modeled in Equation 4-1 of the TC7660CPA datasheet.
TC7660CPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
TC7660CPA FAQ
1.How can I place an order for TC7660CPA through Aetrix?
Please submit a Request for Quotation (RFQ) for TC7660CPA 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 TC7660CPA reliable?
The price and inventory of TC7660CPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC7660CPA is usually 5 days.
3.What payment methods are accepted for TC7660CPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC7660CPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC7660CPA?
TC7660CPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC7660CPA 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 TC7660CPA?
For technical support, including TC7660CPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC7660CPA requirements.
6.How does Aetrix verify that TC7660CPA is sourced from the original manufacturer or authorized distributors?
All TC7660CPA 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 TC7660CPA meets industry standards.
7.What is the process for return or replacement of TC7660CPA?
All TC7660CPA units undergo pre-shipment inspection (PSI). If there is an issue with TC7660CPA, 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 TC7660CPA part is unused and in its original packaging.
Return procedure for TC7660CPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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