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Microchip Technology TC7660SEOA
- Part No.:
- TC7660SEOA
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TC7660SEOA.pdf
- Description:
- IC REG CHARG PUMP INV 20MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,200
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Product details
Overview
TC7660SEOA 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 delivers 99.9% typical voltage conversion efficiency, 98% typical power efficiency, and draws just 80 µA supply current at 5V input. It serves as a compact, low-EMI negative supply generator for RS-232 interfaces and data acquisition systems.
For engineers reviewing the TC7660SEOA datasheet, TC7660SEOA pinout, TC7660SEOA application, or TC7660SEOA equivalent, key selection considerations include its 10 kHz internal oscillator frequency, 70 Ω typical output source resistance at 25°C, wide 1.5–10 V input range, ESD rating of ≥3 kV HBM, and SOIC-8 package compatibility with commercial (0°C to +70°C) and extended temperature operation.
Technical Context
The TC7660SEOA implements a two-phase switched-capacitor inverter architecture with an internal RC oscillator nominally fixed at 10 kHz-adjustable via external capacitor on the OSC pin. Its operation requires no external diodes, even at high input voltages, and includes LV pin logic to optimize oscillator behavior below 3.5 V input.
It functions as an unregulated inverting DC-DC converter: output voltage drops linearly with load current, modeled as an ideal -VIN source in series with ROUT (70–150 Ω depending on temperature and load). The device supports parallel connection to reduce effective output resistance and cascading for higher multiplication factors (e.g., -n·VIN).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +1.5 V to +10 V - supports single-supply systems from low-power sensors to industrial logic rails |
| Output Configuration | Voltage-inverting - generates clean negative rail without inductors or magnetic components |
| Oscillator Frequency | 10 kHz nominal - enables use of low-cost, high-ESR ceramic capacitors; adjustable downward with external OSC capacitor |
| Supply Current | 80 µA typ @ V+ = 5 V - ultra-low quiescent draw suitable for battery-backed instrumentation |
| Output Source Resistance | 70 Ω typ @ 25°C, 20 mA - defines load regulation slope; drops to ~35 Ω when two devices are paralleled |
| Conversion Efficiency | 99.9% typ voltage efficiency, 98% typ power efficiency - minimizes heat rise and input power waste |
| ESD Protection | ≥3 kV HBM - robust handling during board assembly and field service |
Pinout & Package
TC7660SEOA is housed in an 8-pin narrow SOIC (SOIC-N) package, 3.90 mm body width, with standard JEDEC MS-012AC footprint and Pb-free matte tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No connection | Internally unconnected; must remain floating - no routing or soldering required |
| 2 (CAP+) | Charge pump flying capacitor positive terminal | Connects to high-side plate of external pump capacitor; polarity-sensitive in polarized designs |
| 3 (GND) | Common ground reference | Single-point return for input, output, and internal regulator - critical for noise control and stability |
| 4 (CAP-) | Charge pump flying capacitor negative terminal | Completes charge transfer loop; reverse polarity risks capacitor damage in electrolytic implementations |
| 5 (VOUT) | Negative output voltage node | Delivers inverted output; requires low-ESR reservoir capacitor to minimize ripple under load |
| 6 (LV) | Low-voltage oscillator enable | Must tie to GND for V+ < 3.5 V to ensure reliable startup and oscillation; leave open otherwise |
| 7 (OSC) | External oscillator frequency control | Bypass to GND with capacitor to reduce frequency; driven externally for synchronization or boost |
| 8 (V+) | Positive input supply | Primary power input; bypass with low-ESR capacitor close to pin to suppress switching transients |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor design | Eliminates EMI, size, and cost penalties of magnetic components - ideal for space-constrained PCBs |
| Self-contained oscillator | Requires zero external timing components unless frequency adjustment or synchronization is needed |
| Wide input range (1.5–10 V) | Supports direct interface with Li-ion, alkaline, USB, and legacy 5 V/3.3 V logic supplies |
| LV pin logic control | Ensures stable operation down to 1.5 V by adapting internal biasing - no external level-shifting needed |
| Parallel/cascade capability | Enables scalable output current or voltage multiplication without redesigning core circuit topology |
Applications
| RS-232 Transceiver Power | Data Acquisition Front-End |
|---|---|
Use Scenario: Generating ±5 V or ±12 V rails from a single +5 V microcontroller supply to drive RS-232 line drivers/receivers. IC Role / Device Role / Timing Role: Inverting charge pump providing isolated negative voltage rail with minimal component count. Use Value: Enables full-duplex serial communication without dedicated dual-output DC-DC converters or transformer-based solutions. | Use Scenario: Supplying negative bias to precision op-amps and ADC reference buffers in portable test equipment. IC Role / Device Role / Timing Role: Low-noise, low-quiescent negative supply generator supporting rail-to-rail analog signal conditioning. Use Value: Maintains signal integrity and dynamic range in 16-bit+ data converters by eliminating ground bounce from switching regulators. |
| Portable Instrumentation | Industrial Sensor Signal Conditioning |
Use Scenario: Powering handheld multimeters and oscilloscope probes requiring bipolar analog front-ends from coin-cell or AA batteries. IC Role / Device Role / Timing Role: Ultra-low-IQ inverting converter enabling >100-hour battery life while delivering stable -3.3 V from 3.6 V Li-ion. Use Value: Extends operational runtime without sacrificing measurement accuracy or adding thermal stress. | Use Scenario: Providing negative supply to 4–20 mA transmitter amplifiers and isolation amplifier bias networks in PLC I/O modules. IC Role / Device Role / Timing Role: Robust, ESD-hardened voltage inverter tolerant of industrial voltage transients and wide ambient temperatures. Use Value: Ensures long-term reliability in harsh environments where inductor-based converters risk saturation or EMI coupling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-inverting charge pump applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX660CPA+ | Higher 85 kHz oscillator frequency; lower 35 Ω typical ROUT; requires external timing capacitor for default operation | Better suited for high-current, low-ripple loads; less optimal for ultra-low-IQ battery systems | Select MAX660CPA+ when output impedance <50 Ω and ripple <10 mV are mandatory at >20 mA load |
| ICL7660SIPAZ | Pin-compatible but rated for -40°C to +85°C (I-temp); 100 µA IQ typ; slightly lower ESD (2 kV HBM) | Drop-in replacement for extended temperature deployments where TC7660SEOA's 0°C–70°C range is insufficient | Choose ICL7660SIPAZ when operating outside commercial temperature limits but retaining identical layout and BOM |
Compared with MAX660CPA+ and ICL7660SIPAZ, the TC7660SEOA offers the lowest quiescent current and highest ESD robustness in its temperature class, making it optimal for cost-sensitive, battery-powered, or ESD-prone commercial instrumentation-while trading off some output drive strength and temperature range.
Availability
TC7660SEOA 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 across commercial temperature ranges.
Supply support for TC7660SEOA 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 and global technical support.
The TC7660 product line delivers compact, inductorless DC-DC voltage inversion for space- and cost-constrained applications including communications interfaces, portable instrumentation, and industrial analog signal chains.
FAQ
What is the function of the LV pin on the TC7660SEOA?
The LV (Low Voltage) pin on the TC7660SEOA ensures reliable oscillator startup and operation when the input voltage is below 3.5 V. It must be connected to GND for V+ < 3.5 V; otherwise, it should remain open. This configuration adapts internal biasing to maintain stable 10 kHz oscillation across the full 1.5–10 V input range. Failure to ground LV under low-V+ conditions may result in erratic or failed startup of the TC7660SEOA.
Can the TC7660SEOA generate regulated output voltage?
No, the TC7660SEOA provides unregulated voltage inversion: its output voltage follows VOUT ≈ –V+ minus a drop proportional to load current and output resistance (ROUT). At 20 mA and 25°C, typical ROUT is 70 Ω, yielding ~–4.3 V from a +5 V input. For regulation, an external LDO or feedback-controlled topology is required. The TC7660SEOA itself contains no voltage feedback or error amplifier-its design prioritizes simplicity, low cost, and minimal external components over regulation.
What capacitor values are recommended for stable operation of the TC7660SEOA?
Microchip specifies 10 µF low-ESR electrolytic or tantalum capacitors for both C1 (CAP+/CAP−) and C2 (VOUT/GND) in standard inverting configurations. Ceramic capacitors may be used if total ESR remains ≤1 Ω per capacitor. Larger values reduce output ripple and effective ROUT, while smaller values increase ripple and load regulation error. For OSC frequency reduction, a 100 pF–10 nF capacitor from OSC to GND is typical. All capacitors must be placed within 5 mm of their respective pins for optimal TC7660SEOA performance.
Is the TC7660SEOA pin-compatible with the original ICL7660?
Yes, the TC7660SEOA is explicitly designed as a pin-compatible, enhanced-performance replacement for the industry-standard ICL7660. It shares identical pinout, SOIC-8 packaging, and functional block diagram. Key improvements include higher ESD protection (≥3 kV vs. 2 kV HBM), lower quiescent current (80 µA vs. 170 µA typ), and improved output resistance. No PCB layout changes are required when upgrading from ICL7660 to TC7660SEOA in existing designs.
Does the TC7660SEOA support positive voltage multiplication?
Yes-the TC7660SEOA can be configured for positive voltage multiplication (e.g., +5 V to +10 V) using two external diodes and appropriate capacitor routing, as detailed in Figure 5-6 of the datasheet. However, this mode requires additional components and sacrifices some efficiency due to diode forward voltage drops. The native and optimized function of the TC7660SEOA remains negative voltage generation; positive multiplication is a secondary, application-specific extension-not a built-in feature of the TC7660SEOA IC itself.
TC7660SEOA 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):
- 12V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 20mA
- Frequency - Switching:
- 10kHz ~ 45kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TC7660SEOA FAQ
1.How can I place an order for TC7660SEOA through Aetrix?
Please submit a Request for Quotation (RFQ) for TC7660SEOA 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 TC7660SEOA reliable?
The price and inventory of TC7660SEOA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC7660SEOA is usually 5 days.
3.What payment methods are accepted for TC7660SEOA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC7660SEOA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC7660SEOA?
TC7660SEOA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC7660SEOA 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 TC7660SEOA?
For technical support, including TC7660SEOA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC7660SEOA requirements.
6.How does Aetrix verify that TC7660SEOA is sourced from the original manufacturer or authorized distributors?
All TC7660SEOA 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 TC7660SEOA meets industry standards.
7.What is the process for return or replacement of TC7660SEOA?
All TC7660SEOA units undergo pre-shipment inspection (PSI). If there is an issue with TC7660SEOA, 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 TC7660SEOA part is unused and in its original packaging.
Return procedure for TC7660SEOA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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