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Microchip Technology TC7662BCOA
- Part No.:
- TC7662BCOA
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TC7662BCOA.pdf
- Description:
- IC REG CHARG PUMP INV 20MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,584
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Product details
Overview
TC7662BCOA from Microchip Technology is a pin-compatible charge pump DC-DC voltage converter IC that generates a regulated negative output (–VIN) from a +1.5V to +15V input using only two external capacitors-no inductor required. It delivers up to 20mA load current with 96% power efficiency at 5V input and features a selectable 10kHz/35kHz oscillator via BOOST pin control. It is widely used in RS-232 interface power supplies and data acquisition systems requiring dual-rail ±5V operation.
For engineers reviewing the TC7662BCOA datasheet, TC7662BCOA pinout, TC7662BCOA application, or TC7662BCOA equivalent, this device serves as an improved drop-in replacement for ICL7660-based designs-offering higher switching frequency, lower output impedance, and enhanced low-voltage operation when LV pin is grounded for VIN < 3.5V.
Technical Context
The TC7662BCOA integrates a self-contained charge pump oscillator, MOSFET switch array (P-channel S1; N-channel S2–S4), voltage-level translators, and substrate bias logic to prevent latch-up across temperature and supply ranges. Its RC oscillator operates at 10kHz nominal (35kHz with BOOST = V+), and supports external clocking or frequency reduction via OSC pin capacitor.
Internal anti-latchup circuitry includes an on-chip voltage regulator whose operation is disabled by grounding the LV pin below 3.5V-reducing dropout and improving efficiency at low input voltages. Output source resistance is specified at 65Ω (typ) under 20mA load at 25°C, scaling with temperature and supply voltage per test data.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +1.5V to +15V - supports battery-powered and industrial rails without external regulation |
| Output Voltage | –VIN (inverting mode) - provides true negative rail matching input magnitude, e.g., +5V → –5V |
| Oscillator Frequency | 10kHz (BOOST open) or 35kHz (BOOST = V+) - enables smaller external capacitors (e.g., 0.1µF) in space-constrained SOIC-8 layouts |
| Power Efficiency | 96% (typ) at 5V/5kΩ load - minimizes thermal rise and extends battery life in portable instrumentation |
| Output Source Resistance | 65Ω (typ) at 20mA, 25°C - defines voltage droop under load; reduced further when paralleling multiple TC7662BCOA units |
| Supply Current | 80µA (typ, BOOST open) - ultra-low quiescent draw suitable for always-on sensor nodes and low-power microcontrollers |
| Operating Temperature | 0°C to +70°C - commercial-grade rating aligned with standard PCB assembly and industrial ambient requirements |
Pinout & Package
TC7662BCOA is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package with 1.27mm pitch, compliant with JEDEC MS-012. The package measures 4.90mm × 3.91mm × 1.75mm and is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Oscillator frequency control input | Connect to V+ to raise oscillator frequency from 10kHz to 35kHz; improves ripple and output impedance for compact capacitor designs |
| 2 - CAP+ | Positive pump capacitor terminal | Node where external pump capacitor C1 connects; polarity critical when using polarized electrolytics (+ to CAP+) |
| 3 - GND | Ground reference | Primary return path for internal logic, oscillator, and switch substrates; must be low-impedance for stable operation |
| 4 - CAP– | Negative pump/reservoir capacitor terminal | Connects to negative terminal of reservoir capacitor C2; polarity critical (– to CAP– for inverting configuration) |
| 5 - VOUT | Negative output terminal | Delivers inverted output voltage (–VIN); output impedance varies with load, frequency, and capacitor ESR |
| 6 - LV | Low-voltage mode enable | Ground for VIN ≤ 3.5V to bypass internal regulator and reduce dropout; leave open for VIN > 3.5V to ensure latch-up immunity |
| 7 - OSC | Oscillator timing node | Accepts external capacitor to ground for frequency reduction (e.g., 100pF → ~1kHz); also accepts external CMOS clock via 1kΩ series resistor |
| 8 - V+ | Positive supply input | Accepts +1.5V to +15V; absolute max rating is +16.5V; transient overvoltage may cause destructive latch-up if unclamped |
Key Features
| Feature | Design Value |
|---|---|
| Pin-compatible upgrade to ICL7660 | Direct replacement in legacy designs without PCB changes-same footprint, pinout, and functional behavior |
| Boost-enabled high-frequency mode | 35kHz operation reduces required capacitor size by ~3.5× versus 10kHz, enabling 0.1µF ceramic use in space-constrained SOIC-8 applications |
| LV pin for low-voltage optimization | Grounding LV below 3.5V disables internal regulator, lowering minimum operating voltage and improving conversion efficiency at 1.5–3.5V inputs |
| No-inductor architecture | Eliminates magnetic components, EMI concerns, and board area typically needed for buck-boost or flyback topologies |
| Wide temperature and supply range | Validated from 0°C to +70°C with full electrical specs across +1.5V to +15V input-suitable for commercial instrumentation and embedded control |
Applications
| RS-232 Interface Power Supply | Negative Rail for Data Acquisition |
|---|---|
|
Use Scenario: Generating ±12V or ±5V from a single +5V microcontroller supply to drive RS-232 transceivers (e.g., MAX232 alternatives). IC Role / Device Role / Timing Role: Inverting charge pump providing isolated negative rail; no timing synchronization required-self-oscillating operation suffices. Use Value: Eliminates need for dual-output DC-DC modules or transformer-based solutions-reduces BOM cost and layout complexity while maintaining signal integrity. |
Use Scenario: Providing clean –5V bias for op-amps, ADC references, or analog front-ends in portable data loggers. IC Role / Device Role / Timing Role: Low-noise negative voltage source; BOOST pin unused to maintain 10kHz switching, minimizing conducted EMI near sensitive analog circuits. Use Value: Achieves <100mVpp ripple with 10µF low-ESR capacitors-sufficient for 12-bit ADC performance without additional LDO post-regulation. |
| Voltage Splitter for Single-Supply Systems | Positive Voltage Doubler |
|
Use Scenario: Deriving ±3.3V or ±2.5V from a +5V or +3.3V system rail to power op-amp rails or sensor excitation circuits. IC Role / Device Role / Timing Role: Bidirectional charge pump configured as supply splitter; LV pin grounded to optimize low-voltage headroom. Use Value: Enables true bipolar operation from monolithic supply-output impedance drops significantly vs. standard inverter mode due to parallel switch conduction. |
Use Scenario: Generating +10V from +5V for LCD bias, EEPROM programming, or high-side gate drivers in low-power IoT nodes. IC Role / Device Role / Timing Role: Reconfigured as voltage doubler using external diodes; VOUT pin delivers positive 2×VIN minus diode drops. Use Value: Delivers ~9V at 10mA with ~60Ω source impedance-sufficient for intermittent high-voltage functions without dedicated boost IC. |
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 |
|---|---|---|---|
| ICL7660CPA | Legacy 8-pin DIP; fixed 10kHz oscillator; no BOOST or LV pins; 90% typical efficiency; higher quiescent current (120µA typ) | Limited to through-hole assembly; lacks frequency scaling and low-VIN optimization-unsuitable for modern SOIC-based compact designs | Choose only for legacy repair or DIP-based prototyping where footprint compatibility outweighs efficiency and feature trade-offs |
| MAX660CPA | 8-pin DIP/SOIC; 10kHz/80kHz selectable oscillator; 94% efficiency; integrated shutdown; requires external timing capacitor for frequency setting | Higher max frequency enables smaller capacitors but adds design complexity; shutdown pin adds control flexibility not present in TC7662BCOA | Select when dynamic enable/disable capability or sub-100ns startup is required-otherwise TC7662BCOA offers simpler, more robust passive operation |
Compared with ICL7660CPA and MAX660CPA, the TC7662BCOA provides superior low-voltage operation via the LV pin, higher baseline efficiency (96% vs. 90–94%), and seamless SOIC-8 integration-making it optimal for new commercial designs prioritizing simplicity, efficiency, and surface-mount compatibility.
Availability
TC7662BCOA is available at Aetrix Electronics and suitable for RS-232 interface power supplies, portable data acquisition systems, and voltage-splitting applications requiring stable component supply across commercial temperature ranges.
Supply support for TC7662BCOA 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 leading provider of microcontrollers, analog devices, and power management ICs, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The TC7662B product line was developed specifically for low-power, inductorless DC-DC voltage inversion in space- and cost-constrained applications-including portable instrumentation, interface IC power, and dual-rail analog subsystems.
FAQ
What is the maximum input voltage rating for the TC7662BCOA?
The TC7662BCOA has an absolute maximum supply voltage rating of +16.5V. Operation above +15V is not recommended per datasheet specifications, and exceeding +16.5V-even momentarily-may cause irreversible latch-up or junction damage. For reliable long-term use, keep V+ within the specified +1.5V to +15V operating range. The TC7662BCOA's internal protection does not include overvoltage clamping, so external TVS or Zener limiting is advised in noisy or unregulated environments.
Can the TC7662BCOA generate positive voltage doubling?
Yes, the TC7662BCOA can be configured as a positive voltage doubler using external diodes, as shown in Figure 9 of DS21469A. In this mode, it delivers approximately (2 × VIN) – (2 × VF), where VF is the forward voltage of the diodes. The TC7662BCOA itself remains unchanged-only external component routing differs. Output impedance rises compared to inverting mode (≈60Ω at 10mA, 5V input), and efficiency decreases slightly due to diode losses. This configuration is validated in the datasheet and supported across the full temperature range of the TC7662BCOA.
How does the LV pin affect TC7662BCOA operation below 3.5V input?
Grounding the LV pin on the TC7662BCOA disables its internal voltage regulator, reducing dropout voltage and enabling stable operation down to +1.5V input. At VIN = 2V, this improves output voltage accuracy and efficiency-critical for battery-powered systems. However, for VIN > 3.5V, the LV pin must remain open to maintain latch-up immunity; connecting it to GND under those conditions risks device failure. This behavior is explicitly characterized in the Electrical Characteristics table and Absolute Maximum Ratings section of the TC7662BCOA datasheet.
Is the TC7662BCOA pin-compatible with the ICL7660?
Yes, the TC7662BCOA is fully pin-compatible with the industry-standard ICL7660 in both SOIC-8 and PDIP-8 packages. Pin assignments, electrical behavior, and external component requirements (two capacitors) match exactly. The TC7662BCOA adds enhancements-BOOST and LV pins-but leaves all original pins functionally identical. No PCB redesign is needed when upgrading from ICL7660 to TC7662BCOA, making it a true drop-in replacement with measurable improvements in efficiency, frequency flexibility, and low-voltage performance.
What capacitor types and values are recommended for TC7662BCOA in standard inverting mode?
For standard inverting operation at 10kHz, the TC7662BCOA datasheet recommends 10µF polarized aluminum or tantalum electrolytic capacitors for both C1 (CAP+) and C2 (CAP–/VOUT), with low ESR (< 1Ω) to minimize ripple and output impedance. With BOOST = V+, 0.1µF X7R ceramics are sufficient. Avoid high-ESR capacitors-typical 10Ω ESR can dominate output impedance and degrade regulation. Capacitor polarity is critical: + terminal of C1 to CAP+, – terminal of C2 to GND. Reverse polarity causes immediate malfunction or damage to the TC7662BCOA.
TC7662BCOA 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:
- Positive or Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.5V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 20mA
- Frequency - Switching:
- 10kHz ~ 35kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TC7662BCOA FAQ
1.How can I place an order for TC7662BCOA through Aetrix?
Please submit a Request for Quotation (RFQ) for TC7662BCOA 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 TC7662BCOA reliable?
The price and inventory of TC7662BCOA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC7662BCOA is usually 5 days.
3.What payment methods are accepted for TC7662BCOA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC7662BCOA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC7662BCOA?
TC7662BCOA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC7662BCOA 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 TC7662BCOA?
For technical support, including TC7662BCOA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC7662BCOA requirements.
6.How does Aetrix verify that TC7662BCOA is sourced from the original manufacturer or authorized distributors?
All TC7662BCOA 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 TC7662BCOA meets industry standards.
7.What is the process for return or replacement of TC7662BCOA?
All TC7662BCOA units undergo pre-shipment inspection (PSI). If there is an issue with TC7662BCOA, 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 TC7662BCOA part is unused and in its original packaging.
Return procedure for TC7662BCOA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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