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Microchip Technology TC1044SCPA
- Part No.:
- TC1044SCPA
- Manufacturer:
- Microchip Technology
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
TC1044SCPA.pdf
- Description:
- IC REG CHARGE PUMP 20MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:11,444
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Product details
Overview
TC1044SCPA from Microchip Technology is a charge pump DC-DC voltage converter IC that inverts +1.5V to +12V input to corresponding –1.5V to –12V output using only two external capacitors. It delivers 99.9% voltage conversion efficiency, supports 10kHz/45kHz oscillator frequency selection via BOOST pin, and operates with 80µA supply current at 5V input. It serves as an RS-232 negative power supply and replaces TC7660 in legacy designs.
For engineers reviewing the TC1044SCPA datasheet, TC1044SCPA pinout, TC1044SCPA application, or TC1044SCPA equivalent, key selection considerations include its 8-pin plastic DIP package, ±5V generation from +5V logic supply, LV pin configuration for low-voltage operation, output source resistance of 60Ω (typ) at 20mA, and compatibility with polarized electrolytic capacitors (10µF).
Technical Context
The TC1044SCPA integrates an internal RC oscillator, voltage-level translator, logic network for substrate bias control, and on-chip voltage regulator to prevent latch-up. Its bidirectional MOS switch architecture enables both inverting and positive multiplication topologies without external diodes.
Pin 6 (LV) disables the internal regulator when grounded-required for V+ < 3.5V-but must remain open for V+ > 3.5V to maintain latch-up immunity. Pin 1 (BOOST) raises oscillator frequency from 10kHz to 45kHz, reducing required capacitor size while increasing supply current to 300µA (max).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.5V to 12V - supports battery-powered and industrial logic supplies without external regulation |
| Voltage Conversion Efficiency | 99.9% (typ) - minimizes energy loss during inversion, critical for low-power portable systems |
| Oscillator Frequency | 10kHz (default) or 45kHz (BOOST = V+) - higher frequency allows smaller 10µF external capacitors |
| Supply Current | 80µA (typ) at 5V, no load - enables ultra-low-quiescent operation in always-on circuits |
| Output Source Resistance | 60Ω (typ) at 20mA - defines voltage droop under load; lower than TC7660's ~100Ω |
| ESD Protection | 10kV HBM - exceeds JEDEC JS-001 Class 3B, suitable for handling in non-EPI environments |
| Operating Temperature | 0°C to +70°C - commercial-grade rating matching standard PCB assembly profiles |
Pinout & Package
TC1044SCPA uses an 8-pin plastic DIP package (0.300" wide), with 0.100" lead pitch and through-hole mounting. Package power dissipation is rated at 730mW at TA ≤ 70°C, derated linearly above 50°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BOOST) | Oscillator frequency control input | Connect to V+ to raise FOSC from 10kHz to 45kHz; open or GND for default frequency |
| 2 (CAP+) | Charge pump capacitor positive terminal | Node where external pump capacitor C1 connects; polarity-sensitive for electrolytic use |
| 3 (GND) | Ground reference | System ground return for internal regulator, oscillator, and logic; must be low-impedance |
| 4 (CAP–) | Charge pump capacitor negative terminal | Return path for C1; tied to VOUT in inverting configuration |
| 5 (VOUT) | Inverted output voltage node | Delivers –V+ output; requires reservoir capacitor C2 (10µF) to ground |
| 6 (LV) | Low-voltage mode enable | Ground to disable internal regulator for V+ < 3.5V; leave open for V+ > 3.5V to prevent latch-up |
| 7 (OSC) | Oscillator timing node | Accepts external capacitor to ground for frequency reduction (e.g., 100pF → 1kHz); unused in default mode |
| 8 (V+) | Positive supply input | Primary power input; absolute max rating +13V; must be stable and bypassed locally |
Key Features
| Feature | Design Value |
|---|---|
| No inductor required | Enables compact, EMI-quiet DC-DC inversion using only two low-cost electrolytic capacitors |
| Frequency boost capability | 45kHz operation reduces C1/C2 size by >4× versus 10kHz, easing board space constraints |
| LV pin logic control | Hardware-selectable regulator bypass ensures safe operation across 1.5–12V input range |
| Integrated anti-latch-up circuitry | Logic-network-driven substrate biasing prevents destructive latch-up during start-up or short-circuit |
| RS-232 compliant output | Generates stable –5V rail directly from +5V logic supply, eliminating need for separate negative generator |
Applications
| Portable Instrumentation Power | Legacy RS-232 Interface |
|---|---|
Use Scenario: Battery-powered digital multimeters requiring dual ±5V rails from a single 9V battery. IC Role / Device Role / Timing Role: TC1044SCPA acts as negative voltage generator, inverting +5V derived from battery to –5V for ADC reference and op-amp biasing. Use Value: Eliminates discrete charge pump or transformer-based solutions, reducing BOM count and PCB area by 40%. | Use Scenario: Industrial serial interface boards needing isolated –5V to meet RS-232 voltage swing requirements. IC Role / Device Role / Timing Role: TC1044SCPA provides regulated –5V output referenced to system ground, driving RS-232 line drivers (e.g., MAX232 peripherals). Use Value: Achieves full RS-232 compliance without external diodes or high-voltage transistors, lowering component cost by $0.32/unit. |
| ADC Reference Supply | Split-Rail Audio Preamp |
Use Scenario: 4½-digit data acquisition systems (e.g., TC7135-based) requiring precise ±5V analog supply. IC Role / Device Role / Timing Role: TC1044SCPA generates clean –5V rail synchronized to +5V master supply, minimizing common-mode noise coupling into ADC inputs. Use Value: Delivers 99.9% voltage conversion efficiency, reducing thermal drift in precision measurement front-ends. | Use Scenario: Low-noise microphone preamplifiers in USB audio interfaces needing ±5V rails from +5V USB bus. IC Role / Device Role / Timing Role: TC1044SCPA inverts +5V USB supply to –5V, enabling rail-to-rail op-amp operation without center-tapped transformers. Use Value: Supports 110dB SNR audio paths by maintaining <1mVpp ripple on –5V rail at 10mA load. |
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 |
|---|---|---|---|
| TC7660CPA | Lower max input voltage (10V vs. 12V); no BOOST pin; 10kV ESD vs. TC1044SCPA's 10kV; 100Ω typical ROUT | Not suitable for 12V systems or designs requiring 45kHz switching; higher output impedance limits load current | Select TC7660CPA only for cost-sensitive, <10V, non-boost applications where footprint compatibility is mandatory |
| MAX680CPA | Fixed 10kHz oscillator; no LV pin; higher quiescent current (120µA typ); 80Ω typical ROUT; SOIC-only packaging | Lacks low-voltage mode and frequency boost; incompatible pinout prevents drop-in replacement | Choose MAX680CPA only when SOIC packaging is required and 12V operation or LV control is unnecessary |
Compared with TC7660CPA and MAX680CPA, TC1044SCPA offers wider input range (1.5–12V), programmable oscillator frequency, LV pin for safe low-voltage operation, and lower output impedance-making it the preferred choice for new designs requiring flexibility and performance headroom.
Availability
TC1044SCPA is available at Aetrix Electronics and suitable for portable instrumentation power, RS-232 interface, precision ADC reference supply, and split-rail audio preamp applications requiring stable component supply across commercial temperature range.
Supply support for TC1044SCPA 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 global manufacturing and support infrastructure.
The TC1044S product line was designed to provide pin-compatible, enhanced-performance replacements for legacy charge pump converters-specifically targeting RS-232, portable test equipment, and dual-supply analog systems.
FAQ
What is the maximum input voltage rating for TC1044SCPA?
The absolute maximum supply voltage for TC1044SCPA is +13V. Continuous operation above +12V violates the specified operating range and risks permanent damage. The device is characterized for reliable operation from +1.5V to +12V, with optimal efficiency observed between +3.3V and +5.5V. Exceeding +13V may trigger destructive latch-up due to internal junction breakdown.
Can TC1044SCPA generate +10V from a +5V input?
Yes, TC1044SCPA can generate approximately +10V from a +5V input using the positive voltage multiplication topology shown in Figure 8 of DS21348A. This requires external diodes (D1, D2) and two pump/reservoir capacitors. Output is (2 × V+) minus combined diode forward drops (~1.4V total), yielding ~8.6V under load-not the ideal +10V-due to switch resistance and diode losses.
How does the LV pin affect TC1044SCPA operation below 3.5V input?
When V+ is below 3.5V, grounding the LV pin disables the internal voltage regulator, allowing the TC1044SCPA to operate down to 1.5V input. This bypasses regulator dropout voltage, preserving output regulation margin. Leaving LV open at low V+ causes excessive quiescent current and potential instability, as the regulator attempts-unsuccessfully-to regulate below its minimum headroom.
Is TC1044SCPA pin-compatible with TC7660CPA?
Yes, TC1044SCPA is fully pin-compatible with TC7660CPA in the 8-pin DIP package. Pin assignments (BOOST/CAP+/GND/CAP–/VOUT/LV/OSC/V+) match identically, enabling direct replacement without PCB modification. However, TC1044SCPA adds BOOST and LV functionality-unused pins on TC7660CPA-so legacy designs retain full backward compatibility.
What capacitor types and values are recommended for TC1044SCPA in inverting mode?
For inverting operation, TC1044SCPA requires two 10µF polarized aluminum electrolytic capacitors: C1 (pump) connected between CAP+ and CAP–, and C2 (reservoir) between VOUT and GND. The + terminal of C1 must connect to CAP+, and the + terminal of C2 must connect to GND. Ceramic or tantalum capacitors are not recommended due to insufficient capacitance stability and ESR mismatch at 10kHz/45kHz.
TC1044SCPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
TC1044SCPA FAQ
1.How can I place an order for TC1044SCPA through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1044SCPA 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 TC1044SCPA reliable?
The price and inventory of TC1044SCPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1044SCPA is usually 5 days.
3.What payment methods are accepted for TC1044SCPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1044SCPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1044SCPA?
TC1044SCPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1044SCPA 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 TC1044SCPA?
For technical support, including TC1044SCPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1044SCPA requirements.
6.How does Aetrix verify that TC1044SCPA is sourced from the original manufacturer or authorized distributors?
All TC1044SCPA 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 TC1044SCPA meets industry standards.
7.What is the process for return or replacement of TC1044SCPA?
All TC1044SCPA units undergo pre-shipment inspection (PSI). If there is an issue with TC1044SCPA, 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 TC1044SCPA part is unused and in its original packaging.
Return procedure for TC1044SCPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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