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Microchip Technology TC1044SEOA
- Part No.:
- TC1044SEOA
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TC1044SEOA.pdf
- Description:
- IC REG CHARGE PUMP 20MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,017
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Product details
Overview
TC1044SEOA 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, supports –40°C to +85°C operation, and features a frequency boost pin enabling 45kHz oscillator operation for reduced capacitor size - widely used in RS-232 negative power supplies and portable instrumentation.
For engineers reviewing the TC1044SEOA datasheet, TC1044SEOA pinout, TC1044SEOA application, or TC1044SEOA equivalent, key selection criteria include its extended temperature range (–40°C to +85°C), low 80µA quiescent current at 5V, 60Ω typical output source resistance at 20mA, dual-mode oscillator (10kHz/45kHz), and SOIC-8 package compatibility with legacy TC7660 designs.
Technical Context
The TC1044SEOA integrates an internal RC oscillator, voltage-level translator, logic network, and substrate bias control to prevent latch-up across its full 1.5V–12V input range. Its LV pin disables the internal regulator for sub-3.5V operation, while BOOST pin connection to V+ raises oscillator frequency from 10kHz to 45kHz - directly reducing required external capacitor values.
It implements bidirectional MOSFET switching (P-channel S1, N-channel S2–S4) with dynamic substrate biasing to maintain reverse junction bias under start-up and short-circuit conditions. Output impedance is dominated by capacitive reactance of C1 at half-cycle conduction, yielding ~60Ω typical ROUT at 20mA and 5V input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.5V to 12V - supports single-cell LiFePO₄, 3.3V logic rails, and 9V battery systems without external regulation |
| Voltage Conversion Efficiency | 99.9% (typ) - minimizes energy loss during inversion, critical for low-power portable devices |
| Supply Current | 80µA (typ) at VIN = 5V - enables >10-year battery life in always-on sensor nodes |
| Oscillator Frequency | 10kHz (pin 1 open) or 45kHz (pin 1 = V+) - higher frequency allows use of smaller 1µF pump capacitors instead of 10µF |
| Output Source Resistance | 60Ω (typ) at IOUT = 20mA - defines load regulation error: ~1.2V drop at 20mA output |
| Operating Temperature | –40°C to +85°C - qualified for industrial automation, automotive body electronics, and outdoor metering |
| Package | 8-pin SOIC - surface-mount compatible with automated assembly; 470mW max power dissipation at TA ≤ 70°C |
Pinout & Package
TC1044SEOA is housed in an 8-pin Small Outline Integrated Circuit (SOIC) package with standard 1.27mm pitch, JEDEC MS-012AC compliant dimensions (5.00mm × 6.20mm × 1.75mm), and 470mW thermal limit at 70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BOOST) | Oscillator frequency control input | Connect to V+ to raise oscillator from 10kHz to 45kHz; open or grounded for nominal frequency |
| 2 (CAP+) | Charge pump capacitor positive terminal | Drives external pump capacitor C1; must connect + terminal of polarized electrolytic to this pin |
| 3 (GND) | Ground reference | System ground return for all internal circuitry and external capacitors |
| 4 (CAP–) | Charge pump capacitor negative terminal | Completes pump capacitor loop; connects to negative terminal of C1 |
| 5 (VOUT) | Inverted output voltage node | Delivers –VIN; requires reservoir capacitor C2 to GND for ripple suppression |
| 6 (LV) | Low-voltage mode enable | Connect to GND for VIN < 3.5V to disable regulator; leave open for VIN ≥ 3.5V to prevent latch-up |
| 7 (OSC) | Oscillator timing node | Accepts external capacitor to ground to reduce frequency below 10kHz; unused when internal oscillator active |
| 8 (V+) | Positive supply input | Primary power input; absolute maximum rating is +13V; must be applied before any other signal |
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 required C1 capacitance by 4.5× versus 10kHz mode, shrinking BOM footprint |
| Latch-up protection circuitry | Active substrate bias control prevents destructive latch-up during start-up and output short conditions |
| Wide input voltage support | Operates down to 1.5V - suitable for single alkaline or NiMH cells without pre-regulation |
| ESD robustness | Rated to 10kV HBM - eliminates need for external ESD protection in handheld test equipment |
Applications
| RS-232 Transceiver Power Supply | Portable Digital Multimeter (DMM) |
|---|---|
Use Scenario: Generating –5V rail from a +5V microcontroller supply to bias RS-232 line drivers (e.g., MAX232). IC Role / Device Role / Timing Role: Inverting charge pump providing isolated negative voltage with no magnetic components. Use Value: Eliminates need for dual-output DC-DC converter or transformer-based solution, reducing PCB area by >60% and cost by 40%. | Use Scenario: Powering dual-supply ADCs (e.g., TC7135) and op-amps in handheld DMMs from a single 9V battery. IC Role / Device Role / Timing Role: Negative voltage generator delivering stable –5V at <1mA load for precision analog front-end biasing. Use Value: Achieves 99.9% voltage conversion efficiency, extending battery life beyond 200 hours per 9V cell. |
| Industrial Sensor Signal Conditioning | Low-Power Display Bias Supply |
Use Scenario: Providing –3.3V bias for differential amplifiers and level-shifting circuits in 4–20mA loop-powered sensors. IC Role / Device Role / Timing Role: High-efficiency inverter operating from 3.3V system rail across –40°C to +85°C ambient. Use Value: Maintains 60Ω output impedance over full temperature range, ensuring consistent gain accuracy in analog signal chains. | Use Scenario: Generating –10V for LCD segment bias in battery-operated medical displays (e.g., pulse oximeters). IC Role / Device Role / Timing Role: Cascaded charge pump configuration producing doubled negative output from +5V input. Use Value: Supports cascading up to 10 stages (per datasheet); TC1044SEOA's –40°C to +85°C rating ensures reliability in clinical environments. |
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 |
|---|---|---|---|
| TC1044SCOA | Same electrical specs but rated for 0°C to +70°C only; identical SOIC-8 pinout and footprint | Not suitable for industrial or automotive under-hood deployments requiring extended temperature operation | Select TC1044SEOA when ambient operating temperature exceeds +70°C or drops below 0°C |
| MAX680CPA | Higher 120kHz oscillator, lower 35Ω typical ROUT, but requires external diodes and lacks LV pin for low-VIN optimization | Better for high-current (>30mA) loads but increases component count and layout complexity | Choose MAX680CPA only if output impedance <40Ω is mandatory and external diode integration is acceptable |
Compared with TC1044SCOA, TC1044SEOA adds guaranteed operation down to –40°C - essential for outdoor metering and factory-floor PLCs; versus MAX680CPA, TC1044SEOA trades peak performance for simplicity, requiring zero external diodes and offering superior low-VIN support via the LV pin.
Availability
TC1044SEOA is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable test equipment, and RS-232 interface modules requiring stable component supply across wide temperature ranges and long production lifecycles.
Supply support for TC1044SEOA 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 a focus on embedded control and energy-efficient solutions.
The TC1044S product line was designed as a pin-compatible, enhanced-reliability upgrade to the industry-standard TC7660, targeting cost-sensitive, space-constrained applications needing reliable voltage inversion without inductors.
FAQ
What is the maximum input voltage rating for TC1044SEOA?
The absolute maximum supply voltage for TC1044SEOA is +13V. Operation above +12V is not recommended per datasheet specifications, and exceeding +13V may cause permanent damage. The device is characterized for reliable operation from +1.5V to +12V input across its full –40°C to +85°C temperature range. Always ensure V+ is applied before any other signal to avoid latch-up.
How does the LV pin affect TC1044SEOA operation?
The LV pin on TC1044SEOA controls internal voltage regulator activation. When connected to GND, it disables the regulator to improve efficiency below 3.5V input - essential for single-cell battery operation. Leaving LV open enables regulator action for inputs ≥3.5V, preventing latch-up. Incorrect LV connection (e.g., grounding LV at 5V input) risks device failure. TC1044SEOA's LV functionality is identical to that specified in DS21348A for all TC1044S variants.
Can TC1044SEOA be used to generate positive voltage multiplication?
Yes, TC1044SEOA supports positive voltage multiplication using external diodes (e.g., Figure 8 in DS21348A), producing up to (2×VIN) – (2×VF). This requires adding two diodes and reconfiguring C1/C2 connections. Unlike inversion mode, positive multiplication introduces additional forward voltage drop losses and requires careful diode selection. TC1044SEOA's internal switches enable this bidirectional operation without modification to the IC itself.
What is the purpose of the BOOST pin on TC1044SEOA?
The BOOST pin (Pin 1) on TC1044SEOA raises the internal oscillator frequency from 10kHz to 45kHz when tied to V+, enabling use of smaller external pump capacitors (e.g., 1µF instead of 10µF). This reduces board space and cost while maintaining efficiency. Leaving BOOST open or grounded retains the default 10kHz frequency. TC1044SEOA's BOOST function is electrically identical to that documented for the TC1044S family in Microchip DS21348A.
Is TC1044SEOA pin-compatible with the TC7660?
Yes, TC1044SEOA is explicitly designed as a pin-compatible upgrade to the TC7660, sharing identical SOIC-8 and DIP-8 pinouts, terminal functions, and basic application circuits. Key improvements include extended 1.5V–12V input range, 45kHz boost mode, improved ESD rating (10kV), and enhanced latch-up immunity. No PCB changes are required when replacing TC7660 with TC1044SEOA in existing designs.
TC1044SEOA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TC1044SEOA FAQ
1.How can I place an order for TC1044SEOA through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1044SEOA 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 TC1044SEOA reliable?
The price and inventory of TC1044SEOA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1044SEOA is usually 5 days.
3.What payment methods are accepted for TC1044SEOA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1044SEOA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1044SEOA?
TC1044SEOA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1044SEOA 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 TC1044SEOA?
For technical support, including TC1044SEOA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1044SEOA requirements.
6.How does Aetrix verify that TC1044SEOA is sourced from the original manufacturer or authorized distributors?
All TC1044SEOA 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 TC1044SEOA meets industry standards.
7.What is the process for return or replacement of TC1044SEOA?
All TC1044SEOA units undergo pre-shipment inspection (PSI). If there is an issue with TC1044SEOA, 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 TC1044SEOA part is unused and in its original packaging.
Return procedure for TC1044SEOA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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