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Microchip Technology TC1044SMJA
- Part No.:
- TC1044SMJA
- Manufacturer:
- Microchip Technology
- Package:
- 8-CDIP (0.300", 7.62mm)
- Datasheet:
-
TC1044SMJA.pdf
- Description:
- IC REG CHARGE PUMP 20MA 8CERDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,922
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Product details
Overview
TC1044SMJA 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. It features 99.9% voltage conversion efficiency, 98% power efficiency at 5V input, and operates across –55°C to +125°C. It serves as a pin-compatible upgrade to TC7660 for RS-232 negative power supply generation in industrial instrumentation.
For engineers reviewing the TC1044SMJA datasheet, TC1044SMJA pinout, TC1044SMJA application, or TC1044SMJA equivalent, this device delivers high-efficiency inverting conversion with frequency boost (up to 45kHz), low 80µA quiescent current at 5V, and robust ESD protection up to 10kV - critical for space-constrained, wide-temperature embedded systems requiring stable dual-rail supplies.
Technical Context
The TC1044SMJA integrates an internal RC oscillator (10kHz nominal, 45kHz with BOOST pin tied to V+), logic-controlled MOSFET switch network, and voltage-level translator to enable bidirectional charge pumping without external diodes. Its substrate bias control circuit prevents latch-up during start-up and short-circuit conditions.
It supports multiple topologies: inverting (–VIN), positive doubling (+2VIN – 2VF), cascaded multiplication, and supply splitting. The LV pin disables the internal regulator for improved low-voltage operation below 3.5V, while BOOST and OSC pins allow frequency tuning and external clock synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.5V to 12V - enables direct use with single-cell LiFePO₄, 3.3V logic rails, and legacy 5V/12V systems without pre-regulation. |
| Voltage Conversion Efficiency | 99.9% (typ.) - minimizes energy loss during inversion, reducing heat rise in sealed enclosures. |
| Power Efficiency | 98% (typ., BOOST open) - sustains high efficiency under light loads typical of sensor interface circuits. |
| Supply Current | 80µA (typ., V+ = 5V, TA = 25°C) - extends battery life in portable test equipment and remote data loggers. |
| Oscillator Frequency | 10kHz (nominal), 45kHz (with BOOST = V+) - higher frequency allows smaller 10µF external capacitors instead of 100µF at 1kHz. |
| Output Source Resistance | 105Ω (max, –55°C to +125°C, IOUT = 20mA) - defines worst-case voltage droop under load across full military temperature range. |
| Operating Temperature | –55°C to +125°C - certified for aerospace avionics, downhole tools, and engine-control modules. |
Pinout & Package
TC1044SMJA is housed in an 8-pin Ceramic Dual In-line Package (CerDIP) with hermetic sealing and gold-plated leads, rated for 800mW power dissipation at TA ≤ 70°C and storage from –65°C to +150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BOOST) | Oscillator frequency control input | Tie to V+ to raise FOSC from 10kHz to 45kHz; reduces required capacitor size and ripple. |
| 2 (CAP+) | Charge pump capacitor connection | Anode node for primary pump capacitor C1; must use polarized electrolytic (e.g., 10µF) with + terminal here. |
| 3 (GND) | Ground reference | System ground return for internal regulator, oscillator, and switch logic; requires low-impedance layout. |
| 4 (CAP–) | Charge pump capacitor connection | Cathode node for reservoir capacitor C2; + terminal of C2 connects to GND per inverting configuration. |
| 5 (VOUT) | Inverted output | Delivers –VIN (e.g., –5V from +5V); output impedance varies with temperature and load (105Ω max at –55°C). |
| 6 (LV) | Low-voltage mode control | Connect to GND only for VIN < 3.5V to disable regulator and avoid latch-up; leave open for ≥3.5V. |
| 7 (OSC) | Oscillator timing node | Connect external capacitor to GND to lower frequency (e.g., 100pF → 1kHz); use for ultra-low-noise or low-IQ modes. |
| 8 (V+) | Positive supply input | Accepts 1.5–12V; absolute maximum 13V; all inputs referenced to this rail - exceeding causes latch-up risk. |
Key Features
| Feature | Design Value |
|---|---|
| No external diodes required | Integrated MOSFET switch network eliminates discrete diodes, reducing BOM count and PCB area in RS-232 level-shifter designs. |
| 10kV ESD protection | Robust HBM rating enables handling in uncontrolled environments and improves field reliability in industrial control panels. |
| Frequency boost capability | Pin 1 control raises oscillator to 45kHz, permitting 10µF capacitors instead of 100µF - cuts board space by >70% vs. 1kHz operation. |
| Wide temperature operation | –55°C to +125°C range meets MIL-PRF-38535 Class K requirements for high-reliability military and automotive applications. |
| Pin-compatible TC7660 upgrade | Direct replacement for legacy TC7660 without layout changes, supporting drop-in modernization of aging test equipment and data acquisition systems. |
Applications
| RS-232 Transceiver Power | Portable Instrumentation Supply |
|---|---|
|
Use Scenario: Generating –5V rail for MAX232/MAX3232 RS-232 transceivers from a single +5V microcontroller supply in handheld multimeters. IC Role / Device Role / Timing Role: Charge pump inverter providing isolated negative voltage; no timing role - internal oscillator handles switching. Use Value: Eliminates need for dual-output DC-DC converters or transformer-based solutions, reducing cost and EMI in compact enclosures. |
Use Scenario: Powering dual-supply op-amps (e.g., TL072) and ADC reference buffers in battery-operated environmental sensors. IC Role / Device Role / Timing Role: Negative voltage generator enabling true bipolar signal conditioning from single-ended battery sources. Use Value: Enables rail-to-rail analog front-end performance with 99.9% voltage conversion efficiency, preserving battery runtime. |
| Industrial Data Acquisition | Aerospace Sensor Interface |
|
Use Scenario: Providing –5V for TC7135 4½-digit ADC in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Precision negative supply source; output stability critical for ADC reference accuracy and offset rejection. Use Value: Maintains <105Ω output resistance across –40°C to +85°C, ensuring consistent ADC full-scale error within ±0.01%. |
Use Scenario: Supplying –12V bias for piezoelectric accelerometers and MEMS gyros in flight control units operating at –55°C. IC Role / Device Role / Timing Role: High-reliability inverter meeting DO-160E Section 22 temperature and vibration requirements. Use Value: CerDIP package and –55°C to +125°C rating ensure uninterrupted operation during cold-soak and engine bay thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar charge pump inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TC1044SEPA | Plastic DIP package; rated –40°C to +85°C; 730mW power dissipation; lower ESD rating (not specified beyond standard). | Suitable for commercial/industrial environments but not extended military temperature or hermetic sealing needs. | Select TC1044SEPA when cost sensitivity outweighs extreme temperature or reliability requirements. |
| MAX680CPA | Higher 120kHz oscillator; 125mA output current; ±5V fixed output; requires no LV pin configuration; SOIC-8 only. | Optimized for high-current RS-232 apps; lacks TC1044SMJA's wide input range (1.5–12V) and LV/BOOST flexibility. | Choose MAX680CPA for plug-and-play ±5V generation where load exceeds 20mA and temperature range is limited. |
Compared with TC1044SEPA, TC1044SMJA adds hermetic CerDIP packaging and extended –55°C to +125°C operation at the cost of higher unit price; versus MAX680CPA, it trades higher output current for broader input flexibility, manual frequency control, and military-grade thermal resilience.
Availability
TC1044SMJA is available at Aetrix Electronics and suitable for industrial data acquisition, aerospace sensor interfaces, and portable instrumentation requiring stable component supply across extreme temperature profiles and long lifecycle commitments.
Supply support for TC1044SMJA 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 reliability and long-term product availability.
The TC1044S family was designed specifically for low-power, high-efficiency charge pump voltage inversion in space- and cost-constrained embedded systems - targeting RS-232, precision ADC, and dual-supply analog applications.
FAQ
What is the absolute maximum supply voltage for TC1044SMJA?
The absolute maximum supply voltage for TC1044SMJA is +13V. Exceeding this rating - even momentarily - risks destructive latch-up due to parasitic SCR activation. The device's electrical characteristics are guaranteed only between 1.5V and 12V, and operation above 12V voids parametric compliance. Always include input clamping or overvoltage protection when interfacing with unregulated sources.
How does the LV pin affect TC1044SMJA operation at 2.8V input?
At 2.8V input, the LV pin must be connected to GND to disable the internal voltage regulator and prevent latch-up. This configuration ensures reliable start-up and stable –2.8V output. Leaving LV open at V+ < 3.5V risks improper substrate biasing, leading to excessive supply current or oscillation. TC1044SMJA's LV functionality is confirmed in DS21348A Section "Circuit Description" and Electrical Characteristics table footnote.
Can TC1044SMJA generate +10V from a +5V supply?
Yes, TC1044SMJA can generate approximately +10V from a +5V supply using the positive voltage multiplier topology shown in Figure 8 of DS21348A. It achieves this by charging C1 to ~4.3V (V+ minus diode drop), then transferring charge to C2 to produce ~9.2V (2×V+ minus 2×VF). Output regulation is unregulated, and source impedance rises with load - expect ~60Ω at 10mA per DS21348A typical curves.
What external capacitors are required for basic TC1044SMJA inverting operation?
Basic inverting operation of TC1044SMJA requires two 10µF polarized electrolytic capacitors: C1 (pump) connected between CAP+ (pin 2) and GND (pin 3), and C2 (reservoir) between CAP– (pin 4) and GND. The + terminal of C1 attaches to pin 2; the + terminal of C2 attaches to GND. For 45kHz BOOST mode, these values remain valid; for 1kHz operation, increase both to 100µF per Figure 7.
Is TC1044SMJA RoHS compliant and lead-free?
TC1044SMJA is manufactured in a leaded CerDIP package and is not RoHS compliant. Microchip's official documentation (DS21348A, revision A, 2001) specifies tin-lead (SnPb) termination for the CerDIP variant. For RoHS-compliant alternatives, consider TC1044SEOA (SOIC) or consult Microchip's current product change notifications - TC1044SMJA remains active for legacy military/aerospace programs requiring Pb-based solder compatibility.
TC1044SMJA 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:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-CERDIP
TC1044SMJA FAQ
1.How can I place an order for TC1044SMJA through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1044SMJA 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 TC1044SMJA reliable?
The price and inventory of TC1044SMJA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1044SMJA is usually 5 days.
3.What payment methods are accepted for TC1044SMJA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1044SMJA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1044SMJA?
TC1044SMJA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1044SMJA 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 TC1044SMJA?
For technical support, including TC1044SMJA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1044SMJA requirements.
6.How does Aetrix verify that TC1044SMJA is sourced from the original manufacturer or authorized distributors?
All TC1044SMJA 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 TC1044SMJA meets industry standards.
7.What is the process for return or replacement of TC1044SMJA?
All TC1044SMJA units undergo pre-shipment inspection (PSI). If there is an issue with TC1044SMJA, 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 TC1044SMJA part is unused and in its original packaging.
Return procedure for TC1044SMJA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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