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Microchip Technology TC1044SEPA
- Part No.:
- TC1044SEPA
- Manufacturer:
- Microchip Technology
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
TC1044SEPA.pdf
- Description:
- IC REG CHARGE PUMP 20MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:192
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Product details
Overview
TC1044SEPA 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, eliminating inductors. It delivers 99.9% voltage conversion efficiency, 98% power efficiency, and 80µA supply current at 5V input. It serves as an RS-232 negative power supply in industrial instrumentation and portable data acquisition systems.
For engineers reviewing the TC1044SEPA datasheet, TC1044SEPA pinout, TC1044SEPA application, or TC1044SEPA equivalent, key selection considerations include its extended –40°C to +85°C operating range, 8-pin plastic DIP package, BOOST pin-enabled 45kHz oscillator mode, low 60Ω typical output source resistance at 20mA, and compatibility with polarized electrolytic capacitors for cost-sensitive bipolar supply generation.
Technical Context
The TC1044SEPA implements a four-switch MOS charge pump topology with logic-controlled substrate biasing to prevent latch-up across its full 1.5V–12V input range. Its internal RC oscillator operates at 10kHz (nominal) or 45kHz when BOOST pin is tied to V+, enabling smaller external capacitors.
It features dual-mode LV pin control: grounded for low-voltage operation (<3.5V), open for latch-up protection above 3.5V. Output regulation is achieved passively via capacitor energy transfer - no feedback loop - resulting in a dynamic output impedance dominated by C1 reactance at half the oscillator frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.5V to 12V - supports single-cell LiFePO₄, 3.3V/5V logic rails, and 9V battery inputs without external regulators |
| Voltage Conversion Efficiency | 99.9% (typ.) - minimizes energy loss during inversion, critical for battery-powered RS-232 transceivers |
| Oscillator Frequency | 10kHz (BOOST open) or 45kHz (BOOST = V+) - higher frequency reduces required capacitor size by ~4.5× |
| Supply Current | 80µA (typ.) at 5V, 25°C - enables microamp-level standby in always-on sensor nodes |
| Output Source Resistance | 60Ω (typ.) at 20mA - defines load regulation: e.g., –4.3V output at –10mA with 5V input |
| Operating Temperature | –40°C to +85°C - qualified for industrial embedded control and automotive under-hood auxiliary circuits |
| Package | 8-pin Plastic DIP - through-hole mounting compatible with legacy PCB assembly and manual prototyping |
Pinout & Package
TC1044SEPA uses an 8-pin plastic DIP package (0.300" wide, JEDEC MS-001), rated for 730mW power dissipation at TA ≤ 70°C with linear derating above 50°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BOOST) | Oscillator frequency control input | Connect to V+ to raise oscillator from 10kHz to 45kHz; leave open or ground for default or low-power modes |
| 2 (CAP+) | Charge pump capacitor positive terminal | Drives pumping action; connects to + terminal of C1 (e.g., 10µF polarized electrolytic) |
| 3 (GND) | Ground reference | System ground return for all internal circuitry and external capacitors |
| 4 (CAP–) | Charge pump capacitor negative terminal | Completes pump capacitor path; connects to – terminal of C1 |
| 5 (VOUT) | Inverted output terminal | Delivers negative voltage (e.g., –5V from +5V); connects to – terminal of reservoir capacitor C2 |
| 6 (LV) | Low-voltage mode enable | Ground to disable internal regulator for <3.5V operation; leave open for >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 (1.5–12V); also supplies BOOST and OSC pull-ups when used |
Key Features
| Feature | Design Value |
|---|---|
| No inductor required | Enables compact, EMI-quiet bipolar supply generation using only two low-cost polarized electrolytic capacitors |
| 10kV ESD protection | Robust handling during board assembly and field service without additional transient suppression |
| Frequency boost mode | 45kHz operation allows use of 2.2µF instead of 10µF pump capacitors - 78% board area reduction |
| LV pin logic control | Hardware-selectable low-voltage mode ensures reliable start-up down to 1.5V while preventing latch-up above 3.5V |
| Pin-compatible with TC7660 | Drop-in upgrade path for legacy designs - same footprint, improved specs, wider voltage range |
Applications
| RS-232 Transceiver Power | Data Acquisition System Bias |
|---|---|
|
Use Scenario: Generating –5V rail for MAX232 or SP3222 RS-232 line drivers from a single +5V supply in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Negative voltage generator providing isolated inverted supply; no timing function - operates autonomously via internal oscillator. Use Value: Eliminates need for dual-output DC-DC converters or transformer-based solutions, reducing BOM cost by >40% and layout area by 65%. |
Use Scenario: Supplying –5V to TC7135 4½-digit ADC in portable multimeters powered by a single 9V battery. IC Role / Device Role / Timing Role: Precision negative rail generator; maintains stable VOUT under varying load (1–20mA) with <100mV droop. Use Value: Enables true bipolar analog front-end operation without battery splitting or inefficient linear regulators - extends battery life by 3.2× vs. 7660-based designs. |
| Display Driver Bias Supply | Split-Rail Op-Amp Reference |
|
Use Scenario: Providing –10V bias for LCD segment drivers (e.g., HD44102) in automotive dashboard displays operating from 12V battery. IC Role / Device Role / Timing Role: High-voltage inverter supporting up to –12V output; BOOST pin enables 45kHz switching to minimize capacitor size in space-constrained clusters. Use Value: Achieves –10V @ 5mA with <5% ripple using 4.7µF/16V tantalum caps - meets AEC-Q200 vibration requirements without magnetics. |
Use Scenario: Creating ±5V rails for rail-to-rail op-amps (e.g., MCP6002) in sensor signal conditioning circuits within HVAC controllers. IC Role / Device Role / Timing Role: Dual-rail generator (with companion positive multiplier circuit); provides matched source impedance on both rails for balanced common-mode rejection. Use Value: Delivers symmetrical ±5V outputs with <±0.2V mismatch across –40°C to +85°C - eliminates offset drift in precision 24-bit sigma-delta ADC interfaces. |
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 |
|---|---|---|---|
| TC1044SCPA | Same die, 0°C to +70°C temperature range, 8-pin plastic DIP package | Limited to commercial-grade environments; not suitable for industrial control cabinets or outdoor enclosures | Select TC1044SCPA only for cost-sensitive consumer electronics where ambient temperature stays below 70°C. |
| MAX1044CPA | Pin-compatible but requires external diodes; 80µA supply current vs. TC1044SEPA's 80µA; 97% max power efficiency vs. 98% | No BOOST pin - fixed 10kHz operation; lacks LV pin control - less flexible low-voltage start-up | Choose MAX1044CPA only if legacy MAX1044 design reuse is mandatory; TC1044SEPA offers superior efficiency, frequency flexibility, and latch-up immunity. |
Compared with TC1044SCPA, TC1044SEPA adds industrial temperature support and identical electrical performance; compared with MAX1044CPA, it integrates diodeless operation, BOOST pin frequency scaling, and active LV pin control - delivering lower system cost, smaller footprint, and broader operational safety margin.
Availability
TC1044SEPA is available at Aetrix Electronics and suitable for industrial automation, portable test equipment, and RS-232 interface modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TC1044SEPA 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 quality certifications including ISO 9001 and AEC-Q200.
The TC1044S product line was designed specifically for low-noise, inductorless bipolar power generation in space-constrained and cost-sensitive embedded systems - targeting instrumentation, industrial I/O, and portable measurement applications.
FAQ
What is the maximum input voltage rating for the TC1044SEPA?
The TC1044SEPA has an absolute maximum supply voltage rating of +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 between +3.3V and +9V. Always observe the 0.3V clamp limits on LV, BOOST, and OSC pins relative to V+ to prevent latch-up.
Can the TC1044SEPA generate positive voltage multiplication, not just inversion?
Yes, the TC1044SEPA can perform positive voltage multiplication (e.g., +5V to +10V) using external diodes as shown in Figure 8 of DS21348A. Its bidirectional switch architecture allows charge transfer in either direction. However, startup requires initial positive voltage generation - often implemented with a resistor-LV tie or cascaded configuration - before the internal regulator engages.
How does the LV pin affect TC1044SEPA operation below 3.5V input?
When the LV pin is grounded, the TC1044SEPA disables its internal voltage regulator to reduce threshold voltage and enable reliable start-up and operation down to 1.5V input. Leaving LV open above 3.5V activates the regulator to prevent latch-up. Incorrect LV connection - e.g., grounding LV at 5V - causes destructive latch-up per Absolute Maximum Ratings.
What capacitor types and values are recommended for TC1044SEPA in standard inverting mode?
For standard –5V generation from +5V, use 10µF polarized electrolytic capacitors for both C1 (CAP+–CAP–) and C2 (VOUT–GND). At 45kHz BOOST mode, 2.2µF tantalum or low-ESR aluminum polymer caps suffice. Ceramic capacitors are not recommended due to microphonic effects and voltage coefficient issues affecting regulation stability.
Is TC1044SEPA pin-compatible with the older TC7660?
Yes, TC1044SEPA is fully pin-compatible with the TC7660 in 8-pin DIP packages. It upgrades the TC7660 with extended 1.5V–12V input range, 45kHz BOOST mode, improved 10kV ESD rating, and LV pin control - all without PCB layout changes. No firmware or schematic modifications are needed for drop-in replacement in existing TC7660 designs.
TC1044SEPA 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
TC1044SEPA FAQ
1.How can I place an order for TC1044SEPA through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1044SEPA 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 TC1044SEPA reliable?
The price and inventory of TC1044SEPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1044SEPA is usually 5 days.
3.What payment methods are accepted for TC1044SEPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1044SEPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1044SEPA?
TC1044SEPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1044SEPA 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 TC1044SEPA?
For technical support, including TC1044SEPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1044SEPA requirements.
6.How does Aetrix verify that TC1044SEPA is sourced from the original manufacturer or authorized distributors?
All TC1044SEPA 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 TC1044SEPA meets industry standards.
7.What is the process for return or replacement of TC1044SEPA?
All TC1044SEPA units undergo pre-shipment inspection (PSI). If there is an issue with TC1044SEPA, 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 TC1044SEPA part is unused and in its original packaging.
Return procedure for TC1044SEPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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