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Microchip Technology TC7660IJA
- Part No.:
- TC7660IJA
- Manufacturer:
- Microchip Technology
- Package:
- 8-CDIP (0.300", 7.62mm)
- Datasheet:
-
TC7660IJA.pdf
- Description:
- IC REG CHARGE PUMP INV 8CERDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,984
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Product details
Overview
TC7660IJA from Microchip Technology is an 8-pin CERDIP-packaged charge pump voltage converter that inverts +1.5V to +10V input to corresponding -1.5V to -10V output using only two external capacitors. It features 10 kHz nominal oscillator frequency, 99.9% typical voltage conversion efficiency, 70 Ω typical output source resistance at +25°C, and operates across -25°C to +85°C industrial temperature range. It serves as a pin-compatible replacement for the industry-standard ICL7660 in RS-232 negative supply generation.
For engineers reviewing the TC7660IJA datasheet, TC7660IJA pinout, TC7660IJA application, or TC7660IJA equivalent, key selection considerations include its LV pin logic dependency on input voltage (<3.5V), OSC pin programmability for frequency adjustment, GND-referenced CAP+ and CAP- terminals, and its unregulated inverting topology with linear output droop under load.
Technical Context
The TC7660IJA implements a two-phase switched-capacitor inverter architecture with internal RC oscillator and voltage-level translator. Its operation requires no inductors and relies on external flying (CAP+) and reservoir (CAP-) capacitors to transfer charge between V+ and VOUT terminals.
Internal switching uses bidirectional MOSFETs with on-resistance contributing to output impedance; oscillator frequency is fixed at ~10 kHz when OSC is left open but adjustable via external capacitor or CMOS clock. The LV pin enables stable low-voltage operation by grounding for V+ < 3.5V, altering internal biasing to maintain oscillation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +1.5V to +10V - supports single-supply systems including +3.3V, +5V, and +9V rails without external regulation |
| Output Configuration | Voltage-inverting only (VOUT = –V+) - delivers negative rail without feedback loop or regulation; output drops linearly with load current |
| Oscillator Frequency | 10 kHz (typ, OSC open) - determines ripple frequency and minimum capacitor sizing; adjustable downward with external capacitor |
| Supply Current | 80 µA (typ @ V+ = 5V) - enables ultra-low-quiescent-power operation in battery-backed instrumentation |
| Output Source Resistance | 70 Ω (typ @ +25°C, 20 mA) - defines output voltage droop slope (e.g., –0.7V at –10 mA); increases with temperature and lower V+ |
| ESD Protection | ≥3 kV HBM - enhances robustness in handling and board-level integration without additional protection circuitry |
| Operating Temperature | –25°C to +85°C - qualified for industrial environments including factory automation and test equipment |
Pinout & Package
TC7660IJA is housed in an 8-pin CERDIP package (0.300" wide, hermetically sealed ceramic body) with through-hole mounting and compatibility with JEDEC MS-001AC standards. This package provides enhanced thermal stability and moisture resistance versus plastic alternatives, suitable for extended-life industrial deployments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No connection | Internally unconnected; must remain floating - no routing or PCB pad required |
| 2 (CAP+) | Flying capacitor positive terminal | Connects to high-side plate of charge-transfer capacitor; polarity-sensitive with polarized caps |
| 3 (GND) | Common reference node | Shared ground for input supply, output return, and internal oscillator bias - requires low-inductance layout |
| 4 (CAP-) | Flying capacitor negative terminal | Connects to low-side plate of flying capacitor; reverse polarity relative to CAP+ during phase switching |
| 5 (VOUT) | Negative output terminal | Delivers inverted voltage; connects to reservoir capacitor (C2) and load - not regulated, exhibits linear droop |
| 6 (LV) | Low-voltage enable control | Must be tied to GND for V+ < 3.5V to ensure oscillator startup; left open for V+ ≥ 3.5V |
| 7 (OSC) | Oscillator frequency control | Bypass to GND with capacitor to reduce frequency; accepts external CMOS clock for synchronization |
| 8 (V+) | Positive input supply | Accepts 1.5–10V DC; bypassing with low-ESR capacitor minimizes supply noise coupling into charge pump |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless voltage inversion | Eliminates EMI, size, and cost penalties of magnetic components - ideal for space-constrained PCBs |
| Two-capacitor operation | Reduces BOM count and layout complexity; supports standard 10 µF tantalum or ceramic capacitors |
| Programmable oscillator | Enables ripple optimization and external clock synchronization - critical for noise-sensitive data acquisition |
| Wide input range with LV pin support | Ensures reliable startup down to +1.5V while maintaining compatibility with +5V and +9V systems |
| Hermetic CERDIP packaging | Provides long-term reliability in humid, high-temperature, or mission-critical industrial applications |
Applications
| RS-232 Transceiver Power Supply | Data Acquisition System Bias Rail |
|---|---|
Use Scenario: Generating –5V or –12V from existing +5V or +12V system rail to power RS-232 line drivers/receivers. IC Role / Device Role / Timing Role: Unregulated negative voltage source providing bias for interface ICs requiring dual supplies. Use Value: Eliminates need for isolated DC/DC converters or transformer-based solutions - reduces cost and board area by >40%. |
Use Scenario: Providing negative reference voltage for precision ADCs, op-amp biasing, or sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Charge-pump inverter delivering stable negative rail for analog front-end stages. Use Value: Maintains <1% output droop at 1 mA load - sufficient for 12-bit resolution systems without active regulation. |
| Portable Instrumentation Power | Industrial Sensor Signal Conditioning |
Use Scenario: Enabling bipolar operation in handheld multimeters, oscilloscope probes, or portable logic analyzers powered from single Li-ion cells. IC Role / Device Role / Timing Role: Low-quiescent-current inverter supporting battery life extension in always-on measurement subsystems. Use Value: 80 µA supply current allows >1-year operation from 200 mAh coin cell - validated per DS21465C Figure 2-8. |
Use Scenario: Supplying negative bias to bridge amplifier stages or strain gauge instrumentation amplifiers in PLC I/O modules. IC Role / Device Role / Timing Role: Robust CERDIP-packaged inverter operating continuously across –25°C to +85°C ambient. Use Value: Hermetic seal prevents parameter drift in high-humidity factory environments - meets IEC 60068-2-30 testing. |
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 |
|---|---|---|---|
| ICL7660SCPAZ | Same pinout, but SOIC-8 package and 0°C to +70°C rating; 100 Ω typical ROUT at +70°C vs. TC7660IJA's 120 Ω | Limited to commercial temperature range; unsuitable for industrial ambient extremes | Select when cost sensitivity outweighs temperature requirement and PCB space permits SOIC footprint |
| MAX660CPA+ | Higher 85 kHz oscillator frequency; 3.5 Ω typical ROUT; requires different capacitor values and lacks LV pin | Delivers lower output impedance but demands tighter capacitor tolerance and higher-frequency layout | Choose for high-current, low-droop needs where board redesign for MAX660's layout rules is feasible |
Compared with ICL7660SCPAZ, TC7660IJA offers extended temperature operation and hermetic reliability; compared with MAX660CPA+, it trades lower output impedance for simpler design, lower EMI, and direct drop-in replacement capability in legacy 7660 layouts.
Availability
TC7660IJA is available at Aetrix Electronics and suitable for industrial instrumentation, factory automation interfaces, and portable test equipment requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for TC7660IJA 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 infrastructure.
The TC7660 product line was designed specifically for low-cost, inductorless DC/DC voltage inversion in industrial and instrumentation applications where reliability, simplicity, and wide input voltage range are prioritized over regulation.
FAQ
What is the function of the LV pin on the TC7660IJA?
The LV pin on the TC7660IJA ensures oscillator startup and stable operation when the input voltage (V+) is below 3.5V. For V+ < 3.5V, the LV pin must be connected directly to GND; for V+ ≥ 3.5V, it must remain open. This configuration adjusts internal biasing to maintain reliable oscillation across the full 1.5V–10V input range - a behavior confirmed in Section 3.5 and Figure 5-1 of DS21465C.
Can the TC7660IJA generate regulated output voltage?
No, the TC7660IJA does not provide regulated output. Its output voltage follows VOUT ≈ –V+ with linear droop proportional to load current and output source resistance (70 Ω typ). As shown in Figure 2-7 and Equation 4-2 of DS21465C, a –10 mA load at +5V input yields approximately –4.3V. Regulation requires external LDO or feedback circuitry - the TC7660IJA itself is inherently unregulated.
What capacitor types and values are recommended for TC7660IJA operation?
DS21465C recommends low-ESR capacitors: 10 µF tantalum or ceramic for both CAP+ and CAP– (C1) and VOUT (C2). Larger values reduce output impedance and ripple; polarized capacitors require correct orientation per Pin Descriptions section. ESR directly impacts ROUT - e.g., 1 Ω ESR per capacitor contributes significantly to total output resistance as modeled in Equation 4-2.
How does the OSC pin affect TC7660IJA performance?
The OSC pin on the TC7660IJA allows oscillator frequency adjustment: connecting an external capacitor to GND lowers frequency (per Figure 2-3), while driving it with a CMOS clock enables synchronization (Figure 5-4). Lower frequencies reduce switching losses and improve efficiency at light loads; higher frequencies permit smaller capacitors but increase EMI. The nominal 10 kHz frequency is achieved with OSC open.
Is TC7660IJA pin-compatible with the original ICL7660?
Yes, TC7660IJA is explicitly designed as a pin-compatible replacement for the industry-standard ICL7660, sharing identical pinout, electrical behavior, and functional block diagram. This compatibility is stated in the General Description (DS21465C-page 1) and verified across all pin functions in Table 3-1 - enabling direct substitution in existing designs without PCB modification.
TC7660IJA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- -25°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-CERDIP
TC7660IJA FAQ
1.How can I place an order for TC7660IJA through Aetrix?
Please submit a Request for Quotation (RFQ) for TC7660IJA 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 TC7660IJA reliable?
The price and inventory of TC7660IJA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC7660IJA is usually 5 days.
3.What payment methods are accepted for TC7660IJA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC7660IJA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC7660IJA?
TC7660IJA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC7660IJA 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 TC7660IJA?
For technical support, including TC7660IJA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC7660IJA requirements.
6.How does Aetrix verify that TC7660IJA is sourced from the original manufacturer or authorized distributors?
All TC7660IJA 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 TC7660IJA meets industry standards.
7.What is the process for return or replacement of TC7660IJA?
All TC7660IJA units undergo pre-shipment inspection (PSI). If there is an issue with TC7660IJA, 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 TC7660IJA part is unused and in its original packaging.
Return procedure for TC7660IJA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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