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Microchip Technology TC682CPA
- Part No.:
- TC682CPA
- Manufacturer:
- Microchip Technology
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
TC682CPA.pdf
- Description:
- IC REG CHRG PUMP INV 10MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,541
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Product details
Overview
TC682CPA from Microchip Technology is a CMOS charge pump voltage inverter that generates a regulated negative doubled output (VOUT = –2 × VIN) from a single positive input supply. It operates over 2.4V to 5.5V input, delivers up to 10 mA output current with 140 Ω typical source resistance, and achieves 99.9% voltage conversion efficiency and 92% power conversion efficiency - ideal for generating –6V from a 3V lithium cell or –10V from a +5V logic rail in portable instrumentation.
For engineers reviewing the TC682CPA datasheet, TC682CPA pinout, TC682CPA application, or TC682CPA equivalent, key selection criteria include its fixed 12 kHz oscillator, minimal external component count (only three capacitors), 8-pin PDIP package with 0°C to +70°C operating range, and suitability for low-noise analog bias generation where space and quiescent current (<185 µA) are critical.
Technical Context
The TC682CPA implements a two-phase switched-capacitor inverting doubler using internal MOSFET switches clocked by an on-chip 12 kHz oscillator. Its architecture avoids inductors and relies on precise timing of C1/C2 charge transfer to achieve near-ideal voltage inversion without regulation feedback.
Output impedance is dominated by switch resistance (≈85 Ω) and capacitor ESR contributions, with ROUT typically 140 Ω at 25°C under 10 mA load. Efficiency degrades predictably with load current due to VDROP = IOUT × ROUT, and ripple is governed by C3 value and ESR per VRIPPLE = {1/[2(fPUMP × C3)] + 2(ESRC3)} × IOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +2.4V to +5.5V - supports direct connection to standard logic rails and single-cell Li batteries without pre-regulation. |
| Output Voltage | VOUT = –2 × VIN (typical) - provides scalable negative bias; e.g., –6V from 3V input or –10V from 5V input. |
| Max Output Current | 10 mA - sufficient for op-amp dual supplies, LCD bias, and panel meter reference circuits. |
| Voltage Conversion Efficiency | 99.9% (typical) - minimizes input current draw and thermal load in battery-powered systems. |
| Power Conversion Efficiency | 92% (typical at RL = 2 kΩ) - enables high-efficiency DC/DC conversion without magnetic components. |
| Oscillator Frequency | 12 kHz (typical) - fixed-frequency operation simplifies EMI filtering and eliminates external timing components. |
| Supply Current (no load) | 185 µA (max) - ultra-low quiescent consumption extends battery life in always-on portable devices. |
| Output Source Resistance | 140 Ω (typical at 25°C) - defines load regulation error (e.g., 1.4 V drop at 10 mA); impacts minimum usable load impedance. |
Pinout & Package
TC682CPA uses an 8-pin plastic DIP (PDIP) package with 0.300-inch width, 0.100-inch lead pitch, and through-hole mounting. Pin 1 is marked by a notch or dot; Pin 8 is NC (no connection) and must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (C1–) | Capacitor C1 negative terminal | Connects to negative side of first pump capacitor; critical for phase-1 charge transfer timing. |
| 2 (C2+) | Capacitor C2 positive terminal | Connects to positive side of second pump capacitor; participates in voltage inversion during phase-1. |
| 3 (C2–) | Capacitor C2 negative terminal | Completes C2 connection; referenced to GND during phase-2 to transfer inverted voltage to COUT. |
| 4 (VOUT) | Negative output voltage | Delivers regulated –2×VIN; requires external reservoir capacitor (COUT) for ripple reduction. |
| 5 (GND) | Ground reference | System ground return path for all internal switches and external capacitors; must be low-impedance. |
| 6 (VIN) | Positive input supply | Accepts 2.4–5.5V input; internally clamped to 5.8V max to prevent damage from overvoltage transients. |
| 7 (C1+) | Capacitor C1 positive terminal | Connects to positive side of first pump capacitor; switched between VIN and GND during oscillation phases. |
| 8 (NC) | No connection | Internally unconnected; must be left floating - no trace or solder pad should connect to this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting voltage doubler topology | Generates precise –2×VIN output without inductors or external clock, reducing BOM cost and board area. |
| Fixed 12 kHz internal oscillator | Eliminates need for external timing components while enabling predictable EMI profile and capacitor sizing. |
| Only three external capacitors required | Minimizes footprint and assembly steps: two 3.3 µF pump caps (C1, C2) and one reservoir cap (COUT). |
| Low 185 µA quiescent current | Extends operational time in battery-critical applications such as handheld meters and cellular RF modules. |
| 140 Ω typical output source resistance | Enables stable operation into 2 kΩ loads (5 mA @ 10 V drop) and supports post-regulation with LDOs like TC54. |
| On-chip overvoltage protection | VIN clamped to ~5.8V and VOUT to ~–11.6V via integrated Zener diodes, preventing latch-up or permanent damage. |
Applications
| LCD Display Bias Generator | Portable Handheld Instruments |
|---|---|
Use Scenario: Generating negative gate bias for STN or TFT LCD panels requiring –5V to –15V rails. IC Role / Device Role / Timing Role: Inverting voltage doubler providing stable, low-noise VEE supply directly from main system rail. Use Value: Eliminates discrete inductor-based converters; reduces EMI and enables compact, low-profile display module designs. |
Use Scenario: Powering dual-supply op-amps and precision ADC references in battery-operated multimeters and data loggers. IC Role / Device Role / Timing Role: Negative rail generator delivering –6V from 3V lithium coin cell with <185 µA standby draw. Use Value: Enables true bipolar analog signal conditioning without compromising battery life or PCB real estate. |
| Cellular Phone Peripheral Supply | Operational Amplifier Power Supplies |
Use Scenario: Providing isolated negative bias for RF front-end ICs, audio codecs, or sensor interfaces in GSM/UMTS handsets. IC Role / Device Role / Timing Role: Low-ripple inverter supplying clean –5V to analog subsystems decoupled from noisy digital domains. Use Value: Achieves >92% power efficiency and <60 mVpp ripple (with 10 µF COUT), meeting stringent RF noise specifications. |
Use Scenario: Creating split-rail ±5V or ±6V supplies for rail-to-rail op-amps in industrial sensor signal chains. IC Role / Device Role / Timing Role: Compact dual-voltage source supporting both positive and negative analog signal paths. Use Value: Delivers 10 mA output with 140 Ω source impedance, ensuring <1% load regulation error across full operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting voltage doubler applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX680CPA | Higher 100 kHz oscillator frequency; requires smaller pump capacitors but increases EMI sensitivity. | Better suited for space-constrained designs needing faster transient response; less optimal for ultra-low-noise analog bias. | Select MAX680CPA when board area is limited and higher switching frequency is acceptable for reduced capacitor size. |
| ICL7660SCPAZ | Lower 10 kHz oscillator; 170 Ω typical ROUT; wider –40°C to +85°C temp range; no internal overvoltage clamp. | More tolerant of temperature variation; lacks VIN/VOUT clamping, requiring external protection for robust industrial use. | Choose ICL7660SCPAZ for extended temperature operation where external overvoltage protection is already implemented. |
Compared with MAX680CPA and ICL7660SCPAZ, the TC682CPA offers superior voltage conversion efficiency (99.9%), lower quiescent current (185 µA), and integrated overvoltage protection - making it optimal for battery-sensitive, noise-critical portable analog power applications where reliability and efficiency outweigh raw speed or extended temperature range.
Availability
TC682CPA is available at Aetrix Electronics and suitable for portable handheld instruments, LCD display bias generation, and operational amplifier power supplies requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for TC682CPA 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 Inc. is a leading provider of microcontroller, mixed-signal, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The TC682CPA belongs to Microchip's legacy charge pump converter product line, designed specifically for low-power, inductorless negative voltage generation in portable and space-constrained analog systems.
FAQ
What is the maximum input voltage rating for the TC682CPA?
The TC682CPA has an absolute maximum input voltage (VIN) rating of +5.8V, enforced by on-chip Zener clamping circuitry. Operation above this level risks permanent damage. The recommended operating range remains +2.4V to +5.5V per datasheet specifications, and the TC682CPA must not be subjected to sustained overvoltage conditions even briefly.
Can the TC682CPA generate regulated output voltage?
The TC682CPA provides an unregulated inverted doubled output (VOUT ≈ –2 × VIN) with inherent load-dependent droop due to its 140 Ω typical output resistance. For regulation, an external negative LDO such as the TC54VC2702Exx must be used downstream - as demonstrated in Figure 4-3 of the TC682CPA datasheet - to maintain stable –5V output under varying load conditions.
What capacitor values are recommended for optimal TC682CPA performance?
For optimal TC682CPA performance, use 3.3 µF low-ESR ceramic capacitors for C1 and C2 (rated ≥6V for C1, ≥12V for C2), and a 10–22 µF low-ESR capacitor for COUT (rated ≥12V). These values yield 140 Ω typical output resistance and <60 mVpp ripple at 10 mA load; larger COUT values further reduce ripple but increase physical size and cost.
Is the TC682CPA pin-compatible with other members of the TC682 family?
Yes, the TC682CPA shares identical pinout and functionality with TC682COA (SOIC), TC682EPA (extended-temp PDIP), and TC682EOA (extended-temp SOIC). All four variants use the same 8-pin configuration, electrical characteristics, and application circuit - differing only in package type and temperature grade.
How does temperature affect TC682CPA output resistance?
TC682CPA output resistance increases with temperature: from ~140 Ω at 25°C to ~200 Ω at 100°C (per DS21453D-page 7 graph). This rise directly impacts load regulation - e.g., a 10 mA load causes ~1.4 V drop at 25°C but ~2.0 V at 100°C - requiring derating or thermal-aware design margins in high-temperature environments.
TC682CPA 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):
- 2.4V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 10mA
- Frequency - Switching:
- 12kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
TC682CPA FAQ
1.How can I place an order for TC682CPA through Aetrix?
Please submit a Request for Quotation (RFQ) for TC682CPA 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 TC682CPA reliable?
The price and inventory of TC682CPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC682CPA is usually 5 days.
3.What payment methods are accepted for TC682CPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC682CPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC682CPA?
TC682CPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC682CPA 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 TC682CPA?
For technical support, including TC682CPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC682CPA requirements.
6.How does Aetrix verify that TC682CPA is sourced from the original manufacturer or authorized distributors?
All TC682CPA 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 TC682CPA meets industry standards.
7.What is the process for return or replacement of TC682CPA?
All TC682CPA units undergo pre-shipment inspection (PSI). If there is an issue with TC682CPA, 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 TC682CPA part is unused and in its original packaging.
Return procedure for TC682CPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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