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Microchip Technology TC1044SIJA
- Part No.:
- TC1044SIJA
- Manufacturer:
- Microchip Technology
- Package:
- 8-CDIP (0.300", 7.62mm)
- Datasheet:
-
TC1044SIJA.pdf
- Description:
- IC REG CHARGE PUMP 20MA 8CERDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,143
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Product details
Overview
TC1044SIJA from Microchip Technology is a charge pump DC-DC voltage converter that inverts +1.5V to +12V input to –1.5V to –12V output using only two external capacitors-no inductor required. It delivers 99.9% voltage conversion efficiency, 98% power efficiency at 5V input, and operates with 80µA supply current. It serves as an RS-232 negative power supply and replaces TC7660 in industrial instrumentation requiring ±5V dual-rail operation.
For engineers reviewing the TC1044SIJA datasheet, TC1044SIJA pinout, TC1044SIJA application, or TC1044SIJA equivalent, this page provides verified technical context for inverter-based dual-supply generation, low-ESD-sensitive analog front-ends, and legacy system upgrades where ceramic DIP packaging and –25°C to +85°C operation are mandatory.
Technical Context
The TC1044SIJA integrates an internal RC oscillator (10kHz nominal, 45kHz with BOOST pin high), logic-controlled MOSFET switch network, and substrate bias management to prevent latch-up during start-up and short-circuit conditions. Its LV pin enables regulator bypass below 3.5V input, reducing dropout and improving low-voltage efficiency.
It implements bidirectional charge transfer via four MOS switches (one P-channel, three N-channel) with dynamic substrate voltage control. Output impedance is dominated by pump capacitor reactance (XC ≈ 3.18Ω at 10kHz with 10µF C1), and cascading supports up to 10-stage inversion with VOUT = –n·VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.5V to 12V - Supports battery-powered and wide-input industrial rails without external regulation. |
| Voltage Conversion Efficiency | 99.9% (typ.) - Minimizes energy loss in capacitor-based inversion; critical for low-power analog systems. |
| Supply Current | 80µA (typ., VIN = 5V, BOOST open) - Enables ultra-low-quiescent designs such as portable meters and sensor nodes. |
| Oscillator Frequency | 10kHz (nominal), 45kHz (with BOOST = V+) - Higher frequency allows smaller external capacitors (e.g., 10µF instead of 100µF). |
| Output Source Resistance | 60Ω (typ., IOUT = 20mA, TA = 25°C) - Defines load regulation; e.g., –4.3V output at –10mA with 5V input. |
| Operating Temperature | –25°C to +85°C - Qualified for extended industrial environments including automotive cabin electronics and factory automation. |
| Package | 8-Pin CerDIP - Hermetic ceramic package ensures long-term reliability and moisture resistance in harsh environments. |
Pinout & Package
TC1044SIJA uses an 8-pin cerdip (ceramic dual in-line package) with 0.3-inch body width and 0.1-inch lead pitch. The package provides hermetic sealing, superior thermal stability, and ESD robustness up to 10kV-critical for repairable or mission-critical analog subsystems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BOOST) | Oscillator frequency control input | Connect to V+ to raise FOSC from 10kHz to 45kHz; reduces required C1/C2 size and ripple. |
| 2 (CAP+) | Pump capacitor positive terminal | Drives charge transfer cycle; connects to + terminal of polarized electrolytic C1 (e.g., 10µF). |
| 3 (GND) | Ground reference | System ground return; must be low-impedance path for switching currents to avoid noise coupling. |
| 4 (CAP–) | Pump capacitor negative terminal | Completes charge transfer loop; connects to – terminal of C1 and + terminal of reservoir C2. |
| 5 (VOUT) | Inverted output | Delivers –VIN; output impedance ~60Ω limits max continuous current to ~15mA at 5V input. |
| 6 (LV) | Low-voltage mode enable | Ground to disable internal regulator for VIN < 3.5V; leave open for VIN > 3.5V to prevent latch-up. |
| 7 (OSC) | Oscillator timing node | Accepts external capacitor to lower frequency (e.g., 100pF → 1kHz); also accepts external TTL clock via 1kΩ series resistor. |
| 8 (V+) | Positive supply input | Primary power rail; absolute max 13V; must power up before any other pin to avoid destructive latch-up. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates EMI, size, and cost penalties of magnetic components-ideal for space-constrained PCBs. |
| Pin-compatible TC7660 upgrade | Direct drop-in replacement with extended voltage range (1.5–12V vs. 1.5–10V) and frequency boost capability. |
| 10kV ESD protection | Enables handling and assembly in non-ESD-controlled environments without additional protection circuitry. |
| LV pin for low-VIN optimization | Reduces effective dropout by disabling regulator below 3.5V, enabling reliable –2.5V generation from 2.5V logic rails. |
| Cascadable topology | Supports multi-stage inversion (e.g., –10V from +5V) with predictable VOUT = –n·VIN and weighted ROUT summation. |
Applications
| RS-232 Transceiver Power | Portable Digital Multimeter |
|---|---|
Use Scenario: Generating –5V rail for MAX232-level RS-232 interface ICs from a single +5V microcontroller supply. IC Role / Device Role / Timing Role: Negative voltage generator providing isolated –5V output with minimal external parts. Use Value: Eliminates need for separate negative supply or transformer-based solution-reduces BOM count and board area by >40%. |
Use Scenario: Supplying –5V to TC7135 4½-digit ADC in handheld multimeters powered by 9V battery or USB 5V. IC Role / Device Role / Timing Role: Precision negative rail source synchronized to ADC reference; low quiescent current extends battery life. Use Value: 80µA supply current enables >100-hour battery operation; 99.9% conversion efficiency minimizes self-heating in sealed enclosures. |
| Industrial Sensor Signal Conditioning | Legacy Instrumentation Upgrade |
Use Scenario: Providing bipolar ±5V supplies for op-amp-based strain gauge amplifiers in PLC analog input modules. IC Role / Device Role / Timing Role: Dual-rail generator supporting rail-to-rail input stages and precision offset trimming. Use Value: CerDIP package withstands thermal cycling in industrial cabinets; –25°C to +85°C rating ensures operation across ambient extremes. |
Use Scenario: Replacing obsolete TC7660 in field-repairable test equipment where SOIC/DIP footprints are fixed but performance must improve. IC Role / Device Role / Timing Role: Pin-identical functional upgrade delivering higher efficiency, wider VIN, and better ESD tolerance. Use Value: No PCB redesign needed; 10kV ESD rating reduces field failure rate in technician-handled units. |
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 |
|---|---|---|---|
| TC1044SEOA | Same die, SOIC-8 package; 0°C to +85°C rating; 470mW max power dissipation vs. 800mW for TC1044SIJA. | Preferred for surface-mount production; unsuitable for through-hole repair or high-reliability hermetic requirements. | Select TC1044SEOA only when automated assembly and board space constraints outweigh need for ceramic ruggedness. |
| MAX1044CPA | Functional equivalent with identical pinout; 10kV ESD; but rated only to +70°C and lacks LV pin control for sub-3.5V operation. | Valid for commercial-grade instruments; cannot replace TC1044SIJA in extended-temp industrial deployments. | Choose MAX1044CPA only if temperature range ≤ +70°C and no LV-mode operation is required. |
Compared with TC1044SEOA and MAX1044CPA, TC1044SIJA uniquely combines hermetic CerDIP packaging, –25°C to +85°C operation, and LV pin flexibility-making it the sole option for field-serviceable, thermally demanding, or low-VIN analog subsystems.
Availability
TC1044SIJA is available at Aetrix Electronics and suitable for industrial instrumentation, portable test equipment, and RS-232 interface design requiring stable component supply, long-lifecycle support, and hermetic packaging integrity.
Supply support for TC1044SIJA 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 emphasis on industrial, automotive, and aerospace reliability standards.
The TC1044S product line was designed specifically to provide robust, low-cost, inductorless voltage inversion for legacy and new analog systems-emphasizing pin compatibility, ESD resilience, and wide-input flexibility.
FAQ
What is the maximum input voltage supported by TC1044SIJA?
The TC1044SIJA supports a maximum input voltage of +13V per Absolute Maximum Ratings. However, its specified operating range is +1.5V to +12V. Exceeding +12V risks violating electrical characteristics and may cause premature wear or latch-up, especially if LV pin is improperly configured. Always observe the 13V absolute limit and derate above 70°C per datasheet note 2.
Can TC1044SIJA generate positive voltage multiplication?
Yes, TC1044SIJA can perform positive voltage multiplication using external diodes (e.g., Figure 8 in DS21348A), producing up to (2·VIN) – (2·VF). This requires adding D1 and D2; the device itself does not integrate diodes. Output impedance rises compared to inverting mode, and efficiency drops due to diode forward voltage losses-so TC1044SIJA is primarily optimized for inversion, not multiplication.
Why does TC1044SIJA require different LV pin handling based on input voltage?
The LV pin controls internal voltage regulator activation. Below 3.5V, connecting LV to GND disables the regulator to reduce dropout and enable reliable inversion (e.g., –2.5V from 2.5V). Above 3.5V, leaving LV open ensures latch-up immunity by maintaining proper substrate bias on internal N-channel switches-failure to do so risks destructive current paths during transients.
Is TC1044SIJA pin-compatible with the original TC7660?
Yes, TC1044SIJA is fully pin-compatible with the TC7660 and functions as a direct upgrade. It retains identical pinout, footprint, and basic functionality while adding BOOST pin capability, extended 12V input support, improved ESD (10kV), and LV pin control-requiring no PCB changes when replacing TC7660 in existing designs.
What external capacitors are required for basic TC1044SIJA operation?
TC1044SIJA requires two external polarized electrolytic capacitors: C1 (pump, 10µF typical) between CAP+ (pin 2) and CAP– (pin 4), and C2 (reservoir, 10µF typical) between CAP– (pin 4) and GND (pin 3). For 45kHz BOOST mode, 10µF remains sufficient; for 1kHz low-frequency operation, increase both to 100µF to maintain output impedance and ripple performance.
TC1044SIJA 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:
- 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
- Voltage - Output (Max):
- -
- Current - Output:
- 20mA
- Frequency - Switching:
- 10kHz, 45kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -25°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-CERDIP
TC1044SIJA FAQ
1.How can I place an order for TC1044SIJA through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1044SIJA 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 TC1044SIJA reliable?
The price and inventory of TC1044SIJA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1044SIJA is usually 5 days.
3.What payment methods are accepted for TC1044SIJA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1044SIJA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1044SIJA?
TC1044SIJA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1044SIJA 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 TC1044SIJA?
For technical support, including TC1044SIJA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1044SIJA requirements.
6.How does Aetrix verify that TC1044SIJA is sourced from the original manufacturer or authorized distributors?
All TC1044SIJA 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 TC1044SIJA meets industry standards.
7.What is the process for return or replacement of TC1044SIJA?
All TC1044SIJA units undergo pre-shipment inspection (PSI). If there is an issue with TC1044SIJA, 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 TC1044SIJA part is unused and in its original packaging.
Return procedure for TC1044SIJA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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