My Inquiry
My Account
Microchip Technology TC682EOA
- Part No.:
- TC682EOA
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TC682EOA.pdf
- Description:
- IC REG CHRG PUMP INV 10MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:443
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TC682EOA from Microchip Technology is a CMOS charge pump voltage inverter that generates a regulated negative output voltage equal to –2×VIN from a single positive input supply (2.4V to 5.5V). It delivers up to 10 mA output current with 140 Ω typical source resistance, 92% power efficiency, and operates across –40°C to +85°C. It serves as an LCD bias generator or op-amp dual-rail supply in portable instrumentation.
For engineers reviewing the TC682EOA datasheet, TC682EOA pinout, TC682EOA application, or TC682EOA equivalent, key selection criteria include its –40°C to +85°C industrial temperature rating, 8-pin SOIC package, low 185 µA quiescent current, and compatibility with 3.3 µF low-ESR external capacitors for full implementation.
Technical Context
The TC682EOA integrates a fixed-frequency 12 kHz oscillator and four internal MOSFET switches to implement a two-phase charge pump topology. It uses external C1 and C2 pump capacitors to transfer and invert charge, then delivers the inverted doubled output (VOUT = –2×VIN) through a reservoir capacitor C3.
Its on-chip Zener clamps limit VIN to 5.8 V and VOUT to –11.6 V, preventing damage during overvoltage transients. Output regulation relies entirely on passive component selection-no feedback loop or voltage reference is integrated.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +2.4 V to +5.5 V - supports single-cell Li-ion (3 V), USB (5 V), and logic rails without external regulators |
| Output Voltage | VOUT = –2 × VIN - provides –4.8 V to –11 V output, e.g., –6 V from 3 V battery or –10 V from 5 V logic supply |
| Max Output Current | 10 mA - sufficient for biasing LCD segments, op-amp inputs, or low-power analog circuitry |
| Supply Current | 185 µA (typ.) - enables multi-year battery life in handheld instruments with no load |
| Oscillator Frequency | 12 kHz (typ.) - determines ripple frequency and allows use of low-cost ceramic capacitors |
| Output Source Resistance | 140 Ω (typ. at 25°C) - defines voltage droop under load: ΔV = IOUT × 140 Ω |
| Power Efficiency | 92% (typ. at 2 kΩ load) - minimizes heat generation and extends battery runtime |
Pinout & Package
TC682EOA is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package with 1.27 mm pitch, 3.99 mm width, and 4.90 mm length per Microchip drawing 00002C. Pin 1 is marked by a beveled corner or dot; Pin 8 is NC (no connection) and must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1– | Capacitor C1 negative terminal | Connects to negative side of first pump capacitor; critical for phase-1 charge transfer |
| C2+ | Capacitor C2 positive terminal | Connects to positive side of second pump capacitor; forms inversion node during phase 1 |
| C2– | Capacitor C2 negative terminal | Connects to negative side of second pump capacitor; referenced to ground during phase 2 |
| VOUT | Negative output voltage | Delivers regulated –2×VIN; requires external reservoir capacitor (C3) for ripple reduction |
| GND | Ground reference | Common return path for input, oscillator, and output stages; must be low-impedance |
| VIN | Positive input supply | Accepts 2.4–5.5 V DC; internally clamped to 5.8 V max to prevent damage |
| C1+ | Capacitor C1 positive terminal | Connects to positive side of first pump capacitor; switched between VIN and GND each cycle |
| NC | No connection | Pin 8 is unbonded; must be left floating-no trace or solder mask required |
Key Features
| Feature | Design Value |
|---|---|
| Inverting voltage doubler topology | Generates precise –2×VIN output without inductors or transformers-ideal for space-constrained PCBs |
| Only three external capacitors | Eliminates need for external diodes, resistors, or control ICs-reduces BOM count and layout area |
| 185 µA quiescent current | Enables >10-year battery life in always-on handheld meters using CR2032 cells |
| 140 Ω output source resistance | Supports stable –6 V @ 5 mA or –10 V @ 3 mA with <5% droop-suitable for precision analog biasing |
| –40°C to +85°C operating range | Validated for industrial environments including automotive cabin modules and outdoor test equipment |
Applications
| LCD Display Bias Generator | Portable Handheld Instrument |
|---|---|
Use Scenario: Generating negative gate bias voltage for STN or FSTN LCD panels requiring –10 V to –15 V rails. IC Role / Device Role / Timing Role: Charge pump inverter providing stable –2×VIN output; no timing interface required-self-clocked at 12 kHz. Use Value: Replaces bulky discrete inverter circuits; achieves <60 mVpp ripple with 10 µF C3 and 10 mA load-ensures uniform contrast across display. | Use Scenario: Powering dual-rail op-amps and ADC reference buffers in battery-powered multimeters or data loggers. IC Role / Device Role / Timing Role: Negative rail generator deriving –6 V from a single 3 V lithium cell; operates continuously during measurement cycles. Use Value: Delivers 10 mA at –6 V with only 0.84 V droop (140 Ω × 6 mA), enabling rail-to-rail input op-amps without performance loss. |
| Cellular Phone Peripheral Supply | Operational Amplifier Power Supply |
Use Scenario: Providing isolated negative bias for RF front-end ICs or audio codec analog sections in legacy GSM handsets. IC Role / Device Role / Timing Role: Standalone inverter supplying clean –5 V to –8 V rails; immune to digital noise due to charge-pump isolation. Use Value: Achieves 99.9% voltage conversion efficiency-minimizes thermal impact on adjacent baseband processors. | Use Scenario: Creating split supplies for precision instrumentation amplifiers in panel-mounted process controllers. IC Role / Device Role / Timing Role: Dual-rail generator producing matched ±12 V from +5 V system rail via cascaded TC682 stages. Use Value: Supports 16-bit ADC linearity by limiting PSRR degradation-output impedance remains stable across –40°C to +85°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar charge pump inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX682ESA+ | Higher 100 kHz oscillator; 125 Ω typical ROUT; requires 1 µF pump caps vs. 3.3 µF for TC682EOA | Better suited for low-ripple, high-current loads (>15 mA); less tolerant of ESR variation | Select MAX682ESA+ when higher switching frequency reduces capacitor size and board area is critical |
| TPS60403DBVR | Fixed 500 kHz frequency; 110 Ω ROUT; integrated soft-start; requires only two 1 µF capacitors | Designed for ultra-low-noise analog rails; includes enable pin and thermal shutdown | Choose TPS60403DBVR for new designs needing tighter regulation, lower EMI, or production-ready protection features |
Compared with MAX682ESA+ and TPS60403DBVR, the TC682EOA offers superior temperature range (–40°C to +85°C vs. –40°C to +85°C for MAX682ESA+, –40°C to +125°C for TPS60403DBVR), lower quiescent current (185 µA vs. 250 µA and 120 µA), and proven reliability in legacy industrial systems-but lacks enable control or thermal protection.
Availability
TC682EOA is available at Aetrix Electronics and suitable for portable handheld instruments, LCD display bias generation, and operational amplifier power supplies requiring stable component supply across extended temperature ranges.
Supply support for TC682EOA 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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and power management ICs, with ISO/TS-16949 certified fabrication facilities.
The TC682EOA belongs to Microchip's legacy charge pump converter product line, designed specifically for low-power, inductorless negative voltage generation in battery-operated and space-constrained analog systems.
FAQ
What is the maximum input voltage the TC682EOA can tolerate?
The TC682EOA has an absolute maximum VIN rating of +5.8 V, enforced by internal Zener clamping. Operation above +5.5 V is not recommended-exceeding +5.8 V risks permanent damage. At +5.5 V input, the TC682EOA delivers up to –11 V output with 10 mA load and 140 Ω source resistance. Always verify input transient suppression in systems where VIN may spike beyond nominal rails.
Can the TC682EOA generate regulated output voltage?
No-the TC682EOA is an unregulated charge pump inverter. Its output voltage follows VOUT ≈ –2×VIN minus droop (IOUT × ROUT). For example, with VIN = 3.0 V and IOUT = 5 mA, VOUT ≈ –6.0 V – (0.005 × 140) = –6.7 V. To achieve regulation, pair the TC682EOA with an external negative LDO such as the TC54VC2702Exx, as shown in Figure 4-3 of the TC682EOA datasheet.
What capacitor values are recommended for optimal TC682EOA performance?
Microchip specifies 3.3 µF low-ESR ceramic capacitors for C1 and C2, and 10–22 µF for C3 (reservoir). With 3.3 µF pump caps and 10 µF C3, the TC682EOA achieves 140 Ω ROUT and <60 mVpp ripple at 10 mA. Larger C1/C2 values reduce ROUT but increase start-up time; larger C3 reduces ripple but adds cost and footprint. Avoid electrolytics-high ESR degrades efficiency and increases droop.
Is the TC682EOA pin-compatible with other variants in the TC682 family?
Yes-the TC682EOA shares identical pinout and electrical behavior with TC682COA, TC682CPA, and TC682EPA. All use the same 8-pin SOIC or PDIP footprint and functional block diagram. The sole difference is temperature grade: TC682EOA is rated for –40°C to +85°C, while TC682COA/CPA are 0°C to +70°C. No PCB redesign is needed when upgrading from COA to EOA for extended-temperature deployment.
Does the TC682EOA require external clocking or control signals?
No-the TC682EOA contains a fully integrated 12 kHz oscillator and requires no external clock, enable, or sync signals. All operation is autonomous after power-up: VIN applied, three capacitors connected (C1, C2, C3), and VOUT becomes active within milliseconds. This simplifies design for cost-sensitive, low-complexity applications like panel meters and basic LCD biasing where minimal external components are mandatory.
TC682EOA 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):
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TC682EOA FAQ
1.How can I place an order for TC682EOA through Aetrix?
Please submit a Request for Quotation (RFQ) for TC682EOA 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 TC682EOA reliable?
The price and inventory of TC682EOA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC682EOA is usually 5 days.
3.What payment methods are accepted for TC682EOA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC682EOA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC682EOA?
TC682EOA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC682EOA 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 TC682EOA?
For technical support, including TC682EOA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC682EOA requirements.
6.How does Aetrix verify that TC682EOA is sourced from the original manufacturer or authorized distributors?
All TC682EOA 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 TC682EOA meets industry standards.
7.What is the process for return or replacement of TC682EOA?
All TC682EOA units undergo pre-shipment inspection (PSI). If there is an issue with TC682EOA, 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 TC682EOA part is unused and in its original packaging.
Return procedure for TC682EOA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TC682EOA Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
