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Microchip Technology TC682EPA
- Part No.:
- TC682EPA
- Manufacturer:
- Microchip Technology
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
TC682EPA.pdf
- Description:
- IC REG CHRG PUMP INV 10MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,249
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Product details
Overview
TC682EPA 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 across +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 TC682EPA datasheet, TC682EPA pinout, TC682EPA application, or TC682EPA equivalent, key selection criteria include its –40°C to +85°C industrial temperature rating, 8-pin PDIP package compatibility, low 185 µA quiescent current, and minimal external component count (only three 3.3 µF capacitors required).
Technical Context
The TC682EPA integrates a fixed-frequency 12 kHz on-chip oscillator and four internal MOSFET switches arranged in a two-phase charge pump topology. It uses capacitor C1 and C2 to alternately charge and transfer charge to reservoir capacitor C3, enabling inversion and doubling without inductors.
Its output regulation relies on inherent charge transfer dynamics rather than feedback control; output voltage droop under load is determined by ROUT (140 Ω typ.) and load current (VDROP = IOUT × ROUT), with VOUT = –2VIN – IOUT × ROUT. The device includes on-chip Zener clamps limiting VIN to 5.8V and VOUT to –11.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | Inverting voltage doubler: converts +2.4V–+5.5V input to –4.8V to –11V output without inductors. |
| Input Voltage Range | +2.4V to +5.5V - supports single-cell Li-ion (3V), alkaline (3×AA), and +5V logic rails. |
| Output Current | Up to 10 mA - sufficient for biasing op-amps, LCD segments, or sensor interfaces. |
| Voltage Efficiency | 99.9% (typ.) - minimal voltage loss relative to theoretical –2×VIN, critical for battery-sensitive designs. |
| Power Efficiency | 92% (typ. at RL = 2 kΩ) - reduces heat generation and extends battery life in portable systems. |
| Quiescent Current | 185 µA (max. at TA = 25°C, no load) - enables ultra-low standby power in always-on subsystems. |
| Oscillator Frequency | 12 kHz (typ.) - sets charge transfer rate; lower frequency allows use of low-ESR ceramic capacitors. |
Pinout & Package
TC682EPA is housed in an 8-pin plastic DIP (PDIP) package with 0.300-inch body width and standard 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 | Switched node connecting C1's negative plate to ground or C2– during phase 1; critical for charge transfer timing. |
| 2: C2+ | Capacitor C2 positive terminal | Node tied to VIN during phase 1; establishes reference for inverted voltage development across C2. |
| 3: C2– | Capacitor C2 negative terminal | Switched node connecting C2's negative plate to C1– during phase 1; forms inverted –2VIN potential. |
| 4: VOUT | Negative output terminal | Delivers regulated –2VIN output; connects to reservoir capacitor C3 and load; sourced via 140 Ω typical impedance. |
| 5: GND | Ground reference | Primary return path for all internal switching currents and external capacitors; must be low-impedance. |
| 6: VIN | Positive input supply | Accepts +2.4V to +5.5V; internally clamped to 5.8V max; powers oscillator and switch drivers. |
| 7: C1+ | Capacitor C1 positive terminal | Switched node connecting C1's positive plate to GND or VIN during alternating phases; stores and transfers charge. |
| 8: NC | No connection | Internally unconnected; must be left floating - no routing or soldering permitted. |
Key Features
| Feature | Design Value |
|---|---|
| 99.9% voltage conversion efficiency | Minimizes output voltage deviation from ideal –2VIN, preserving signal headroom in precision analog stages. |
| Only 3 external capacitors required | Eliminates inductors and feedback components - reduces BOM cost, PCB area, and design validation effort. |
| 140 Ω typical output source resistance | Enables stable 10 mA output with ≤1.4 V droop; simplifies load regulation analysis without closed-loop compensation. |
| –40°C to +85°C operating range | Validated performance across industrial ambient conditions - suitable for metering, test equipment, and automotive cabin modules. |
| On-chip 12 kHz oscillator | Removes need for external clock source or crystal; ensures consistent switching timing across voltage/temperature. |
Applications
| Portable Handheld Instruments | Cellular Phones |
|---|---|
|
Use Scenario: Powering dual-supply op-amps and ADC reference buffers in handheld multimeters and data loggers. IC Role / Device Role / Timing Role: Generates stable –5V or –6V rail from a single 3V lithium cell to enable bipolar analog signal conditioning. Use Value: Eliminates need for separate negative battery or DC/DC converter - reduces size, weight, and bill-of-materials cost. |
Use Scenario: Providing negative bias for RF front-end ICs and audio codec line drivers in legacy GSM handsets. IC Role / Device Role / Timing Role: Supplies –10V LCD display bias voltage from the main +5V system rail during active display mode. Use Value: Achieves required contrast voltage with <185 µA quiescent draw - extends talk time without compromising display quality. |
| LCD Display Bias Generator | Operational Amplifier Power Supplies |
|
Use Scenario: Generating segmented bias voltages (e.g., –10V, –15V) for monochrome STN LCD panels in industrial HMIs. IC Role / Device Role / Timing Role: Inverts and doubles +5V system supply to produce precise negative bias rails synchronized to display refresh timing. Use Value: Delivers low-noise, ripple-controlled output (<60 mV p-p with 10 µF C3) - prevents visible flicker or ghosting on high-contrast displays. |
Use Scenario: Creating split supplies (±5V, ±6V) for rail-to-rail input/output op-amps in sensor signal chains and active filters. IC Role / Device Role / Timing Role: Provides isolated negative rail independent of main system ground - avoids ground loop interference in precision measurement paths. Use Value: Maintains 140 Ω output impedance across –40°C to +85°C - ensures consistent gain accuracy and offset stability over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting voltage doubler applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TC7660CPA | Higher 1.2 mA quiescent current; 10 kHz oscillator; requires larger pump capacitors for same output impedance. | Less suitable for ultra-low-power battery operation; better for cost-sensitive, non-critical industrial use. | Select TC7660CPA only if legacy design reuse or distributor stock availability outweighs efficiency requirements. |
| MAX682CPA | Higher 250 µA quiescent current; 100 kHz oscillator; lower 80 Ω typical ROUT but higher EMI risk at high frequency. | Preferred where faster transient response is needed, but requires tighter EMI filtering and layout control. | Choose MAX682CPA when load step response dominates over battery life - e.g., burst-mode sensor interfaces. |
Compared with TC7660CPA and MAX682CPA, the TC682EPA offers the lowest quiescent current (185 µA max) and highest voltage efficiency (99.9%), making it optimal for long-life portable instruments where output precision and standby power are prioritized over switching speed or absolute minimum BOM cost.
Availability
TC682EPA is available at Aetrix Electronics and suitable for portable handheld instruments, cellular phones, and LCD display bias generator applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TC682EPA 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 company specializing in microcontrollers, analog devices, and power management ICs, with ISO/TS-16949 certified manufacturing and global technical support infrastructure.
The TC682EPA belongs to Microchip's legacy charge pump converter product line, designed specifically for low-noise, inductorless negative voltage generation in space-constrained, battery-powered analog systems.
FAQ
What is the maximum input voltage the TC682EPA can safely handle?
The TC682EPA has an absolute maximum input voltage rating of +5.8V, enforced by on-chip Zener clamping. Operation above +5.5V - its specified maximum - risks excessive current shunting through the clamp diode, potentially degrading reliability. For sustained operation, keep VIN ≤ +5.5V; the device is characterized and guaranteed across +2.4V to +5.5V at –40°C to +85°C. Always verify actual rail tolerance in your system before deploying TC682EPA.
Can the TC682EPA generate a regulated –5V output from a 3V lithium battery?
Yes - the TC682EPA outputs approximately –6V from a 3V input (VOUT ≈ –2 × VIN), which can be regulated to –5V using an external negative LDO such as the TC54VC2702Exx. This configuration is documented in Figure 4-3 of the TC682 datasheet (DS21453D). With proper capacitor selection (C1/C2 = 3.3 µF, C3 = 22 µF), the TC682EPA maintains stable output under 10 mA load while drawing only 185 µA quiescent current - ideal for extending battery life in compact portable systems.
What is the purpose of the NC pin (Pin 8) on the TC682EPA?
Pin 8 of the TC682EPA is designated NC (No Connection) and is not bonded internally. It must remain unconnected - neither routed nor soldered - to avoid unintended coupling, leakage paths, or mechanical stress on the die bond wire. Microchip's package drawings and pin function table (DS21453D, page 3) explicitly state this. Leaving Pin 8 floating is mandatory; tying it to GND, VIN, or any other net violates the device's validated layout and may cause erratic behavior or reduced reliability in the TC682EPA.
How does output ripple vary with reservoir capacitor value in the TC682EPA?
Output ripple in the TC682EPA decreases with increasing reservoir capacitor (C3) value, following VRIPPLE(p-p) = {1/[2(fPUMP × C3)] + 2(ESRC3)} × IOUT. For example, with fPUMP = 12 kHz, IOUT = 10 mA, and 1 Ω ESR, C3 = 10 µF yields ~120 mV p-p ripple, while C3 = 100 µF reduces it to ~25 mV p-p (per DS21453D, Table 4-2). Larger C3 values also improve efficiency by lowering effective output impedance. Use low-ESR tantalum or ceramic capacitors rated ≥12V for C3 to maintain TC682EPA performance.
Is the TC682EPA pin-compatible with the TC682CPA?
Yes - the TC682EPA and TC682CPA share identical 8-pin PDIP footprints, pin assignments, and electrical specifications except for operating temperature range. The TC682CPA is rated for 0°C to +70°C, while the TC682EPA extends to –40°C to +85°C. All pins (C1–, C2+, C2–, VOUT, GND, VIN, C1+, NC) function identically. No PCB layout changes are required when upgrading from TC682CPA to TC682EPA in industrial or automotive-adjacent applications demanding wider thermal margins.
TC682EPA 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
TC682EPA FAQ
1.How can I place an order for TC682EPA through Aetrix?
Please submit a Request for Quotation (RFQ) for TC682EPA 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 TC682EPA reliable?
The price and inventory of TC682EPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC682EPA is usually 5 days.
3.What payment methods are accepted for TC682EPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC682EPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC682EPA?
TC682EPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC682EPA 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 TC682EPA?
For technical support, including TC682EPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC682EPA requirements.
6.How does Aetrix verify that TC682EPA is sourced from the original manufacturer or authorized distributors?
All TC682EPA 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 TC682EPA meets industry standards.
7.What is the process for return or replacement of TC682EPA?
All TC682EPA units undergo pre-shipment inspection (PSI). If there is an issue with TC682EPA, 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 TC682EPA part is unused and in its original packaging.
Return procedure for TC682EPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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