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Microchip Technology TC7660EOA
- Part No.:
- TC7660EOA
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TC7660EOA.pdf
- Description:
- IC REG CHARG PUMP INV 20MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,588
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Product details
Overview
TC7660EOA 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. It operates at 10 kHz nominal oscillator frequency, delivers 99.9% typical voltage conversion efficiency, and features 70 Ω typical output source resistance at +25°C with 20 mA load. It serves as a compact, inductorless negative supply generator for RS-232 interfaces and data acquisition systems.
For engineers reviewing the TC7660EOA datasheet, TC7660EOA pinout, TC7660EOA application, or TC7660EOA equivalent, key selection criteria include input voltage range (1.5–10 V), output impedance behavior across temperature, LV pin logic dependency on V+, oscillator frequency adjustability via OSC pin, and SOIC-8 package compatibility with extended temperature operation (-40°C to +85°C).
Technical Context
The TC7660EOA implements a two-phase switched-capacitor inverter topology with internal RC oscillator and voltage level translator. Its switching action transfers charge between CAP+ and CAP- terminals to generate inverted output at VOUT, without regulation - output voltage droops linearly with load current per ROUT model.
Operation requires explicit LV pin configuration: grounded for V+ < 3.5 V to ensure oscillator stability; left floating otherwise. The OSC pin supports external capacitor-based frequency reduction or CMOS clock injection for synchronization, enabling ripple optimization and EMI control in mixed-signal systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +1.5 V to +10 V - defines minimum startup voltage and maximum safe operating supply; below 3.5 V requires LV = GND |
| Oscillator Frequency | 10 kHz (typ) - sets base switching rate; adjustable downward via OSC-to-GND capacitor for lower quiescent current |
| Voltage Conversion Efficiency | 99.9% (typ) - indicates near-ideal charge transfer ratio under no-load conditions |
| Output Source Resistance | 70 Ω (typ) at TA = +25°C, IOUT = 20 mA - determines output voltage droop slope (ΔVOUT = IOUT × ROUT) |
| Supply Current | 80 µA (typ) at VIN = 5 V - enables ultra-low-power operation in battery-backed instrumentation |
| ESD Protection | ≥3 kV HBM - ensures robustness during board handling and system integration |
| Operating Temperature | -40°C to +85°C - qualified for extended industrial environments, denoted by 'E' suffix |
Pinout & Package
TC7660EOA is housed in an 8-pin narrow SOIC (SOIC-N) package, 3.90 mm body width, with gull-wing leads and Pb-free matte tin finish. Pin 1 is NC (no connection); all other pins are electrically active and functionally defined per Microchip DS21465C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No connection | Unused pad; must remain unconnected to avoid parasitic coupling or latch-up risk |
| 2 (CAP+) | Charge pump flying capacitor positive terminal | Connects to high-side plate of external flying capacitor; polarity-sensitive with polarized caps |
| 3 (GND) | Common ground reference | Single-point return for input supply, output load, and internal regulator; critical for noise rejection |
| 4 (CAP-) | Charge pump flying capacitor negative terminal | Completes flying capacitor loop; reverse polarity causes catastrophic failure with polarized caps |
| 5 (VOUT) | Inverted output voltage node | Delivers negative output; requires low-ESR reservoir capacitor to minimize ripple and stabilize load transients |
| 6 (LV) | Low-voltage oscillator enable | Mandatory GND tie for V+ < 3.5 V; omission causes oscillator stall and output collapse |
| 7 (OSC) | External oscillator frequency control | Bypass to GND with capacitor to reduce fOSC; driven by CMOS clock for synchronization |
| 8 (V+) | Positive input supply | Primary power input; bypassing with low-ESR capacitor suppresses supply noise and improves efficiency |
Key Features
| Feature | Design Value |
|---|---|
| Voltage inversion without inductors | Eliminates magnetic components, PCB area, and EMI concerns - ideal for space-constrained analog front-ends |
| Two-capacitor operation | Reduces BOM count and assembly cost; supports rapid prototyping with standard 10 µF electrolytics or ceramics |
| Configurable oscillator | Enables trade-off between efficiency (low fOSC) and ripple/noise (high fOSC), adaptable to system-level clock domains |
| Extended temperature rating | Validated operation from -40°C to +85°C supports deployment in automotive cabin electronics and industrial PLC modules |
| High conversion efficiency | 99.9% typical VOUTEFF minimizes heat generation and extends battery life in portable data loggers |
Applications
| RS-232 Transceiver Power Supply | Data Acquisition System Bias |
|---|---|
Use Scenario: Generating -5 V rail from existing +5 V logic supply to bias RS-232 line drivers (e.g., MAX232 interface ICs). IC Role / Device Role / Timing Role: Charge pump inverter providing isolated negative voltage; no timing role - asynchronous DC conversion. Use Value: Enables single-supply RS-232 communication without dedicated negative regulators or transformers, reducing component count by ≥3 devices. | Use Scenario: Supplying precision op-amp rails in 16-bit ADC front-end circuits where dual ±5 V supplies are required. IC Role / Device Role / Timing Role: Negative voltage source for analog signal conditioning stage; timing-independent DC generation. Use Value: Maintains 70 Ω output impedance up to +85°C, ensuring predictable voltage droop (<300 mV at 4 mA) for stable reference biasing. |
| Portable Instrumentation Power | Industrial Sensor Signal Conditioning |
Use Scenario: Powering handheld multimeters or pH meters requiring ±3.3 V rails from a single Li-ion cell (3.0–4.2 V). IC Role / Device Role / Timing Role: Low-quiescent-current inverter (80 µA typ) enabling >1-year battery life in sleep mode. Use Value: Operates down to +1.5 V input, supporting deep discharge states while maintaining regulated negative output via external LDO post-regulation. | Use Scenario: Providing negative bias for 4–20 mA transmitter current-loop amplifiers in factory-floor sensors. IC Role / Device Role / Timing Role: Stable -12 V generation from +24 V system rail using cascaded TC7660EOA units. Use Value: Cascading two units achieves -24 V output with doubled ROUT (≈140 Ω), verified for 1 mA loads in -40°C ambient per DS21465C Figure 2-5. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar charge pump voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1044CPA+ | Pin-compatible but requires external diodes for high-VIN operation; 12 kHz fixed oscillator; 100 µA IQ | Less efficient at 1.5–3.5 V inputs due to diode drops; not recommended when LV pin control is needed | Select TC7660EOA for sub-3.5 V operation or when diodeless high-voltage inversion is required |
| ICL7660ACPA+ | Legacy predecessor; no LV pin; 10 kHz oscillator; 120 µA IQ; lower ESD (2 kV HBM) | Lacks LV pin logic - fails to start below 3.5 V; unsuitable for wide-input battery systems | Choose TC7660EOA for extended input range support and improved robustness in automated test equipment |
Compared with MAX1044CPA+ and ICL7660ACPA+, the TC7660EOA offers superior low-voltage startup capability via the LV pin, higher ESD tolerance, and lower quiescent current - making it the preferred choice for battery-powered and industrial-grade negative supply generation where input voltage varies across 1.5–10 V.
Availability
TC7660EOA is available at Aetrix Electronics and suitable for RS-232 interface design, portable instrumentation power management, and industrial sensor signal conditioning requiring stable component supply across extended temperature ranges.
Supply support for TC7660EOA 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 delivers low-cost, inductorless DC-DC voltage inversion for legacy and cost-sensitive analog systems - designed specifically for applications needing simple ± dual-rail generation without complex switching regulators.
FAQ
What is the correct LV pin configuration for TC7660EOA when operating from a +3.3 V supply?
The LV pin on the TC7660EOA must be connected to GND when V+ is below 3.5 V. For a +3.3 V supply, grounding LV ensures reliable oscillator startup and stable output. Leaving LV floating at this voltage risks oscillator failure and zero output - confirmed in Section 3.5 and Electrical Characteristics table footnote for V+L range.
Can TC7660EOA generate regulated -5 V output under varying load conditions?
No, the TC7660EOA is an unregulated charge pump inverter. Its output voltage follows VOUT ≈ –V+ – (IOUT × ROUT), where ROUT rises with temperature and load. At +85°C and 20 mA, ROUT reaches 130 Ω (DS21465C page 2), yielding –4.74 V from +5 V input - not regulation. For stable -5 V, add an LDO post-regulator such as MIC5205-5.0.
How does the OSC pin affect TC7660EOA performance when used with an external capacitor?
Connecting a capacitor from OSC to GND on the TC7660EOA reduces oscillator frequency below 10 kHz, lowering switching losses and improving power efficiency at light loads. Per Figure 2-3, a 100 pF capacitor yields ~5 kHz; larger values further decrease fOSC but require increased C1/C2 values to maintain ripple performance - directly impacting size and cost trade-offs.
Is TC7660EOA compatible with ceramic flying capacitors, and what ESR limits apply?
Yes, TC7660EOA supports ceramic flying capacitors, but ESR must be ≤1 Ω per DS21465C Figure 2-1 notes. Low-ESR ceramics (e.g., X7R 10 µF, 0805) reduce output impedance and improve transient response. High-ESR electrolytics increase ROUT and ripple - verified in Figure 2-7 where ESR dominates droop at >10 mA loads.
What is the maximum continuous output current supported by TC7660EOA at +70°C ambient?
At TA ≤ +70°C, TC7660EOA specifies ROUT ≤ 120 Ω (DS21465C page 2). With +5 V input and 100 mV allowable droop, max continuous IOUT = 100 mV / 120 Ω ≈ 0.83 mA. For higher currents, parallel TC7660EOA units reduce effective ROUT - e.g., two devices yield ~60 Ω, enabling ~1.67 mA within same droop budget.
TC7660EOA 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TC7660EOA FAQ
1.How can I place an order for TC7660EOA through Aetrix?
Please submit a Request for Quotation (RFQ) for TC7660EOA 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 TC7660EOA reliable?
The price and inventory of TC7660EOA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC7660EOA is usually 5 days.
3.What payment methods are accepted for TC7660EOA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC7660EOA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC7660EOA?
TC7660EOA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC7660EOA 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 TC7660EOA?
For technical support, including TC7660EOA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC7660EOA requirements.
6.How does Aetrix verify that TC7660EOA is sourced from the original manufacturer or authorized distributors?
All TC7660EOA 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 TC7660EOA meets industry standards.
7.What is the process for return or replacement of TC7660EOA?
All TC7660EOA units undergo pre-shipment inspection (PSI). If there is an issue with TC7660EOA, 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 TC7660EOA part is unused and in its original packaging.
Return procedure for TC7660EOA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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