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Microchip Technology TC7660MJA
- Part No.:
- TC7660MJA
- Manufacturer:
- Microchip Technology
- Package:
- 8-CDIP (0.300", 7.62mm)
- Datasheet:
-
TC7660MJA.pdf
- Description:
- IC REG CHARGE PUMP INV 8CERDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,316
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Product details
Overview
TC7660MJA from Microchip Technology is a military-grade charge pump voltage converter 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 - enabling compact RS-232 negative supply generation in harsh-environment instrumentation.
For engineers reviewing the TC7660MJA datasheet, TC7660MJA pinout, TC7660MJA application, or TC7660MJA equivalent, key selection criteria include its -55°C to +125°C operating range, CERDIP package with 3 kV HBM ESD protection, low 80 µA typical supply current at 5V, and compatibility with simple ±5V dual-supply derivation from single +5V rails.
Technical Context
The TC7660MJA implements a two-phase switched-capacitor inverter topology with internal RC oscillator and voltage-level translator. Its operation requires no inductors and eliminates external diodes for high-voltage inversion, relying instead on integrated CMOS switches (S1–S4) and internal regulation to sustain charge transfer between CAP+ and CAP- terminals.
Pin 6 (LV) enables stable oscillator operation below 3.5V input by grounding, while Pin 7 (OSC) supports external capacitor-based frequency tuning or synchronization to external CMOS clocks. Output voltage droop follows linear VOUT = -V+ – IOUT × ROUT behavior, with ROUT rising to 150 Ω at full military temperature range (-55°C to +125°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +1.5V to +10V - supports direct derivation of negative rail from common logic supplies including 1.8V, 3.3V, and 5V systems |
| Output Voltage | -1.5V to -10V - unregulated inverted output; magnitude matches input within tolerance, no feedback loop |
| Oscillator Frequency | 10 kHz nominal - fixed internal frequency; adjustable downward via OSC pin capacitor for lower quiescent current |
| Supply Current | 80 µA typical at VIN = 5V - enables ultra-low-power negative biasing in battery-operated data acquisition front-ends |
| Output Source Resistance | 104 Ω typical at TA ≤ +125°C - defines load regulation slope; e.g., -4.3V output at -10 mA with +5V input |
| ESD Protection | ≥3 kV HBM - robust handling in manual assembly and field-repair environments per MIL-STD-883 |
| Operating Temperature | -55°C to +125°C - qualified for aerospace, defense, and downhole industrial applications |
Pinout & Package
TC7660MJA is housed in an 8-pin CERDIP package (.300" wide), hermetically sealed with ceramic lid and metal leads, rated for 800 mW power dissipation at TA ≤ 70°C and compliant with MIL-STD-883 screening requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No connection | Internally unconnected; must remain floating - no PCB trace or component attachment |
| 2 (CAP+) | Charge pump flying capacitor positive terminal | Connects to high-side plate of external 10 µF low-ESR capacitor; critical path for charge transfer timing and ripple |
| 3 (GND) | Common reference for input, output, and internal circuitry | Single-point star ground connection required to minimize noise coupling into sensitive analog measurement paths |
| 4 (CAP-) | Charge pump flying capacitor negative terminal | Connects to low-side plate of same external capacitor as CAP+; polarity must match capacitor marking |
| 5 (VOUT) | Negative output voltage node | Delivers inverted supply to load; requires local 10 µF low-ESR reservoir capacitor to ground for stable regulation |
| 6 (LV) | Low-voltage oscillator enable | Must be tied to GND when V+ < 3.5V to ensure reliable startup and oscillation; left open otherwise |
| 7 (OSC) | External oscillator frequency control | Bypassed with capacitor to GND to reduce frequency; accepts CMOS clock input for synchronization |
| 8 (V+) | Positive input supply | Primary power input; requires local 0.1 µF ceramic bypass capacitor to GND adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Voltage inversion without inductors | Enables PCB area reduction and EMI-free negative rail generation in space-constrained avionics modules |
| Two-capacitor operation | Eliminates need for external diodes or regulators - reduces BOM count and assembly cost in production test equipment |
| Military temperature qualification | Validated operation across -55°C to +125°C ensures reliability in engine control units and satellite payload interfaces |
| 10 kHz fixed oscillator | Provides predictable ripple frequency (5 kHz at VOUT) for filtering design - avoids variable-frequency interference in precision ADC references |
| 150 Ω max output resistance at 125°C | Guarantees defined load regulation performance in high-temp sensor signal conditioning circuits without derating |
Applications
| RS-232 Transceiver Bias Supply | Dual-Supply Data Acquisition Front-End |
|---|---|
Use Scenario: Providing -5V bias to MAX232 or similar RS-232 line drivers in ruggedized field communication terminals. IC Role / Device Role / Timing Role: Charge pump inverter generating clean negative rail from single +5V system supply. Use Value: Eliminates need for isolated DC/DC converter; achieves -4.8V @ 10 mA with <50 mV ripple using 10 µF X7R ceramics. | Use Scenario: Powering ±5V op-amps and SAR ADCs in portable environmental monitoring sensors deployed in desert or arctic conditions. IC Role / Device Role / Timing Role: Negative voltage generator synchronized to system clock via OSC pin to avoid beat frequencies with sampling clock. Use Value: Delivers stable -5.0V output across full -55°C to +125°C range with <3% droop at 8 mA load - meets MIL-PRF-38534 Class H requirements. |
| Portable Instrumentation Power | Aerospace Sensor Signal Conditioning |
Use Scenario: Generating negative supply for LCD bias or photodiode transimpedance amplifiers in handheld multimeters and oscilloscope probes. IC Role / Device Role / Timing Role: Low-quiescent-current inverter enabling >100-hour battery life from two AA cells. Use Value: Draws only 80 µA typical at 3.3V input - extends runtime versus switching regulators with higher standby losses. | Use Scenario: Supplying -10V bias to piezoelectric accelerometers and strain gauge bridges in flight control surface monitoring systems. IC Role / Device Role / Timing Role: Hermetic CERDIP-packaged inverter ensuring long-term reliability under thermal cycling and vibration stress. Use Value: Maintains 97% voltage conversion efficiency at -55°C, preventing cold-start failure during aircraft pre-flight checks. |
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 |
|---|---|---|---|
| TC7660HJA | Same CERDIP package but rated for -40°C to +85°C (E grade); 130 Ω max ROUT at +85°C vs. 150 Ω at +125°C for TC7660MJA | Approved for extended commercial/industrial use; not qualified for military-spec thermal cycling or long-term storage at -55°C | Select TC7660HJA only if full military temp range is unnecessary and cost sensitivity outweighs qualification rigor |
| MAX660CPA+ | SOIC-8 package; 125 kHz oscillator; 120 Ω typical ROUT at +25°C; requires external oscillator capacitor for frequency setting | Higher frequency enables smaller capacitors but increases EMI risk near RF receivers; lacks MIL-STD-883 screening | Choose MAX660CPA+ when board space is constrained and military qualification is not mandated |
Compared with TC7660HJA and MAX660CPA+, the TC7660MJA uniquely combines hermetic CERDIP packaging, -55°C to +125°C operation, and 3 kV HBM ESD rating - making it the sole option qualified for deployment in mission-critical defense electronics where thermal survivability and long-term reliability are non-negotiable.
Availability
TC7660MJA is available at Aetrix Electronics and suitable for RS-232 interface design, portable instrumentation power, and aerospace sensor conditioning requiring stable component supply across extreme temperature profiles and long product lifecycles.
Supply support for TC7660MJA 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 distribution.
The TC7660 product line delivers low-cost, inductorless voltage inversion for legacy and space-constrained systems - designed specifically for applications needing simple ± dual-rail generation without complex regulation or layout overhead.
FAQ
What is the maximum output current capability of the TC7660MJA?
The TC7660MJA does not specify a hard current limit but exhibits increasing output droop with load due to its inherent ROUT characteristic. At +25°C, typical output source resistance is 70 Ω, yielding ~–4.3V at –10 mA with +5V input. At full military temperature range (–55°C to +125°C), ROUT rises to 150 Ω, limiting practical continuous output to approximately –8 mA before exceeding –10% regulation error. Derating is required for sustained loads above 5 mA in high-temp environments. The TC7660MJA datasheet confirms this behavior in Figure 2-7 and Table 1-1.
Can the TC7660MJA generate positive voltage multiplication?
Yes, the TC7660MJA can generate positive voltage multiplication (e.g., +10V from +5V) when used with two external diodes in the configuration shown in Figure 5-6 of the TC7660MJA datasheet. This exploits the bidirectional nature of its internal switches. However, the TC7660MJA itself remains an inverting charge pump - the diodes and external capacitor routing implement the voltage doubling function. Efficiency drops due to diode forward voltage losses (VF1 + VF2), and the TC7660MJA's LV and OSC pins retain their original functions in this mode.
Is the TC7660MJA pin-compatible with the original ICL7660?
Yes, the TC7660MJA is explicitly designed as a pin-compatible replacement for the industry-standard ICL7660, sharing identical 8-pin CERDIP footprint, pinout, and functional behavior. Microchip's DS21465C datasheet states "The TC7660 device is a pin-compatible replacement for the industry standard 7660 charge pump voltage converter." All electrical characteristics, including supply current, oscillator frequency, and output resistance, meet or exceed ICL7660 specifications - with added benefits including improved ESD protection (3 kV HBM) and extended temperature range.
Does the TC7660MJA require external diodes for basic inverting operation?
No, the TC7660MJA does not require external diodes for basic voltage-inverting operation (e.g., +5V to –5V). Its internal CMOS switch matrix (S1–S4) and charge pump architecture eliminate the need for external diodes - a key differentiator from earlier charge pump designs. External diodes are only required for specialized configurations such as positive voltage multiplication (Figure 5-6) or combined inversion/multiplication (Figure 5-7). For standard inverting use, only two external capacitors (CAP+ and VOUT) are needed, as confirmed in the "Features" section of the TC7660MJA datasheet.
How does the LV pin affect TC7660MJA operation below 3.5V input?
The LV pin on the TC7660MJA must be connected to GND when the input voltage (V+) is below 3.5V to ensure reliable oscillator startup and stable switching operation. If left floating under low-VIN conditions, the internal oscillator may fail to start or exhibit erratic frequency behavior, leading to insufficient charge transfer and degraded output voltage. This requirement is documented in Section 3.5 ("Low Voltage Pin") and Figure 5-1 of the TC7660MJA datasheet. At V+ ≥ 3.5V, the LV pin is left open and has no effect on TC7660MJA functionality.
TC7660MJA 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:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-CERDIP
TC7660MJA FAQ
1.How can I place an order for TC7660MJA through Aetrix?
Please submit a Request for Quotation (RFQ) for TC7660MJA 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 TC7660MJA reliable?
The price and inventory of TC7660MJA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC7660MJA is usually 5 days.
3.What payment methods are accepted for TC7660MJA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC7660MJA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC7660MJA?
TC7660MJA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC7660MJA 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 TC7660MJA?
For technical support, including TC7660MJA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC7660MJA requirements.
6.How does Aetrix verify that TC7660MJA is sourced from the original manufacturer or authorized distributors?
All TC7660MJA 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 TC7660MJA meets industry standards.
7.What is the process for return or replacement of TC7660MJA?
All TC7660MJA units undergo pre-shipment inspection (PSI). If there is an issue with TC7660MJA, 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 TC7660MJA part is unused and in its original packaging.
Return procedure for TC7660MJA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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