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Microchip Technology TC7662AIJA
- Part No.:
- TC7662AIJA
- Manufacturer:
- Microchip Technology
- Package:
- 8-CDIP (0.300", 7.62mm)
- Datasheet:
-
TC7662AIJA.pdf
- Description:
- IC REG CHG PUMP INV 40MA 8CERDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,505
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Product details
Overview
TC7662AIJA from Microchip Technology is a charge pump DC-DC voltage converter IC that inverts +3V to +18V input to -3V to -18V output using only two external capacitors-no inductors required. It delivers up to 40mA output current, features 12kHz nominal oscillator frequency, 40Ω typical output source resistance at 20mA load, and operates across -25°C to +85°C. It is used in laptop computers and µP-based controllers for compact dual-rail power generation.
For engineers reviewing the TC7662AIJA datasheet, TC7662AIJA pinout, TC7662AIJA application, or TC7662AIJA equivalent, this page provides verified functional specifications, validated pin functions, confirmed temperature range (-25°C to +85°C), CERDIP package details, and real-world design considerations including oscillator tuning via OSC pin and parallel/cascade configurations.
Technical Context
The TC7662AIJA implements a four-switch MOSFET charge pump topology with internal level shifters and a flip-flop-driven switching sequence synchronized to its on-chip oscillator. Its operation relies on alternating charge transfer between pump (CP) and reservoir (CR) capacitors to invert polarity without magnetic components.
Pin 7 (OSC) allows external capacitor-based oscillator frequency adjustment-from nominal 12kHz down to ~2kHz-enabling trade-offs between switching loss and capacitor impedance. The device requires no low-voltage terminal and eliminates external diodes due to integrated CMOS switch architecture.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +3V to +18V - supports wide-range single-supply systems including 5V and 12V rails. |
| Output Current | Up to 40mA - enables direct powering of op-amp bias networks or analog front-ends. |
| Oscillator Frequency | 12kHz nominal (adjustable via OSC pin) - sets base switching rate; lower frequencies reduce quiescent current. |
| Output Source Resistance | 40Ω typ. at IL = 20mA, VDD = +15V - defines voltage droop under load; impacts regulation in precision analog circuits. |
| Power Efficiency | 93–97% at VDD = +15V, RL = 2kΩ - high conversion efficiency minimizes thermal load in space-constrained designs. |
| Voltage Efficiency | 99% at VDD = +15V, open-load - near-ideal inversion ratio critical for rail-splitting and reference generation. |
| Operating Temperature | -25°C to +85°C - qualified for extended industrial environments, distinct from commercial (0°C to +70°C) variants. |
Pinout & Package
TC7662AIJA is housed in an 8-pin CERDIP (Ceramic Dual In-line Package) with 0.300-inch body width and 0.100-inch lead pitch, rated for 800mW power dissipation and 90°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 6 | NC | No internal connection - must remain unconnected; floating or tied to GND per layout best practice. |
| 2 | C+ | Positive terminal of pump capacitor CP - connects to + side of polarized electrolytic or tantalum capacitor. |
| 3 | GND | Analog ground reference - serves as return path for all internal switches and external capacitors. |
| 4 | C− | Negative terminal of pump capacitor CP - connects to − side of CP; polarity reversal enables voltage inversion. |
| 5 | VOUT | Inverted output voltage node - delivers negative rail; output impedance depends on CP/CR values and ESR. |
| 7 | OSC | Oscillator control input - adding external capacitor to GND lowers frequency; enables optimization for low-IQ operation. |
| 8 | VDD | Positive supply input - accepts 3V–18V; internal circuitry draws ≤650µA at +15V and 25°C. |
Key Features
| Feature | Design Value |
|---|---|
| Pin compatibility | Direct replacement for ICL7662/SI7661/TC7660/LTC1044 - enables drop-in upgrade without PCB revision. |
| No external diodes | Integrated CMOS switch array eliminates discrete diodes - reduces BOM count and layout area by ~30%. |
| Wide input range | 3V–18V operation - supports battery-powered (3.3V/5V) and industrial (12V/15V) supplies in same design. |
| Low output impedance | 40Ω typical at 20mA - sustains stable negative rail under dynamic loads common in sensor signal conditioning. |
| Adjustable oscillator | External capacitor on OSC pin tunes frequency from 2kHz to 12kHz - balances efficiency vs. ripple in low-power modes. |
Applications
| Laptop Computers | Disk Drives |
|---|---|
Use Scenario: Generating -5V or -12V rail from main +5V/+12V supply for analog circuitry and interface ICs. IC Role / Device Role / Timing Role: Negative voltage converter providing isolated bias for op-amps, ADC drivers, and RS-232 transceivers. Use Value: Eliminates need for transformer-based or inductor-based inverters, reducing EMI and board area in thin-profile designs. |
Use Scenario: Supplying negative bias to voice coil motor (VCM) drivers and preamplifier stages in HDD servo control. IC Role / Device Role / Timing Role: High-efficiency charge pump delivering regulated -5V from +5V system rail. Use Value: Enables precise head positioning via low-noise analog bias while maintaining thermal budget in sealed drive enclosures. |
| Process Instrumentation | µP-based Controllers |
Use Scenario: Creating bipolar ±5V or ±12V supplies for 4–20mA loop transmitters and isolated analog front-ends. IC Role / Device Role / Timing Role: Inverting DC-DC converter supporting rail-to-rail op-amp operation and precision DAC references. Use Value: Delivers stable negative rail over -25°C to +85°C range without derating, meeting industrial environmental requirements. |
Use Scenario: Powering LCD bias generators, EEPROM programming voltages, and analog peripherals in microcontroller subsystems. IC Role / Device Role / Timing Role: Compact voltage inverter enabling dual-rail operation from single-supply MCU platforms. Use Value: Reduces component count versus discrete charge pump solutions while maintaining compatibility with legacy TC7660 layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar charge pump voltage converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1044CSW#PBF | SOIC-16 package; 10kHz oscillator; max 20mA output; requires external timing capacitor for frequency setting. | Lower output current and different pinout limit direct substitution in high-current TC7662AIJA designs. | Select when SOIC packaging, tighter output voltage regulation, or programmable oscillator is prioritized over current capability. |
| ICL7662CPE | PDIP-8 package; 10kHz oscillator; 20mA max output; no OSC pin - fixed frequency only. | Lacks oscillator tuning and delivers half the output current; not suitable for >20mA loads or low-IQ optimization. | Choose only for cost-sensitive, low-current legacy replacements where CERDIP packaging and extended temperature are not required. |
Compared with LTC1044CSW#PBF and ICL7662CPE, the TC7662AIJA offers higher output current (40mA vs. 20mA), adjustable oscillator frequency via OSC pin, and extended temperature rating (-25°C to +85°C), making it optimal for industrial µP controllers and instrumentation requiring robust negative rail generation.
Availability
TC7662AIJA is available at Aetrix Electronics and suitable for laptop computers, disk drives, process instrumentation, and µP-based controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TC7662AIJA 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 Inc. is a leading provider of microcontrollers, analog devices, and memory products, headquartered in Chandler, Arizona, with global design and manufacturing operations certified to ISO/TS-16949.
The TC7662A product line was designed specifically for compact, inductorless negative voltage generation in space-constrained portable and industrial electronics-emphasizing pin compatibility, wide input range, and thermal robustness.
FAQ
What is the maximum output current specification for the TC7662AIJA?
The TC7662AIJA is rated for up to 40mA of continuous output current. This value is confirmed in the Electrical Characteristics table (DS21468B-page 3) under "Output Current" with test conditions at VDD = +15V and TA = +25°C. Performance remains within specification across its full operating temperature range of -25°C to +85°C, though output resistance increases slightly at temperature extremes.
Does the TC7662AIJA require external diodes for operation?
No, the TC7662AIJA does not require external diodes. Its CMOS construction integrates four MOSFET switches that perform bidirectional charge transfer, eliminating the need for discrete diodes used in older charge pump topologies. This is explicitly stated in the Features section of the datasheet and validated in the Functional Block Diagram (DS21468B-page 2).
How does the OSC pin (Pin 7) affect TC7662AIJA performance?
The OSC pin on the TC7662AIJA allows external capacitor-based adjustment of the internal oscillator frequency-from nominal 12kHz down to approximately 2kHz. Adding capacitance lowers frequency, reducing quiescent current and switching losses but increasing capacitor impedance; DS21468B-page 7 confirms this behavior with typical COSC vs. frequency curves and design guidance for CP/CR scaling.
What is the operating temperature range for the TC7662AIJA?
The TC7662AIJA is specified for operation from -25°C to +85°C, as indicated in the Device Selection Table (DS21468B-page 1) and confirmed in the Absolute Maximum Ratings section (DS21468B-page 3). This "I" suffix rating distinguishes it from commercial (C), extended (E), and military (M) variants of the same family.
Can multiple TC7662AIJA devices be paralleled to increase output current?
Yes, multiple TC7662AIJA devices can be paralleled to reduce effective output resistance and increase total deliverable current. Figure 4-3 in the datasheet (DS21468B-page 7) shows the configuration: each device uses its own pump capacitor (CP), while sharing a common reservoir capacitor (CR). The resultant output resistance approximates ROUT / n, where n is the number of paralleled units.
TC7662AIJA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-CDIP (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):
- 3V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 40mA
- Frequency - Switching:
- 12kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -25°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-CERDIP
TC7662AIJA FAQ
1.How can I place an order for TC7662AIJA through Aetrix?
Please submit a Request for Quotation (RFQ) for TC7662AIJA 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 TC7662AIJA reliable?
The price and inventory of TC7662AIJA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC7662AIJA is usually 5 days.
3.What payment methods are accepted for TC7662AIJA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC7662AIJA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC7662AIJA?
TC7662AIJA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC7662AIJA 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 TC7662AIJA?
For technical support, including TC7662AIJA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC7662AIJA requirements.
6.How does Aetrix verify that TC7662AIJA is sourced from the original manufacturer or authorized distributors?
All TC7662AIJA 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 TC7662AIJA meets industry standards.
7.What is the process for return or replacement of TC7662AIJA?
All TC7662AIJA units undergo pre-shipment inspection (PSI). If there is an issue with TC7662AIJA, 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 TC7662AIJA part is unused and in its original packaging.
Return procedure for TC7662AIJA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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