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Renesas ICL7660CPA
- Part No.:
- ICL7660CPA
- Manufacturer:
- Renesas
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ICL7660CPA.pdf
- Description:
- IC REG CHARG PUMP INV 45MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,071
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Product details
Overview
ICL7660CPA from Intersil (now Renesas) is a monolithic CMOS charge-pump voltage converter IC that performs positive-to-negative supply conversion across 1.5V–12V input, delivering complementary output voltages from –1.5V to –12V. It integrates an RC oscillator, voltage level translator, series regulator, and four power MOS switches in an 8-lead PDIP package. It enables ±5V generation from +5V logic supplies for RS-232 interfaces and data acquisition systems.
For engineers reviewing the ICL7660CPA datasheet, ICL7660CPA pinout, ICL7660CPA application, or ICL7660CPA equivalent, key selection criteria include its 10 kHz nominal oscillator frequency, 60 Ω typical output source resistance at 20 mA, 96% minimum power efficiency, LV pin for low-voltage operation bypass, and BOOST pin for frequency scaling-critical for optimizing capacitor size and output impedance in space-constrained designs.
Technical Context
The ICL7660CPA implements a two-phase switched-capacitor topology using internal P- and N-channel MOSFETs to invert input voltage without inductors. Its oscillator operates at 5–10 kHz (free-running at 5V), adjustable via external capacitor on OSC pin or overdriven by external clock, with BOOST pin enabling ~3.5× frequency increase for lower output impedance.
Internal substrate bias logic and voltage level translation prevent SCR latchup across temperature and load conditions. The LV pin disables the internal series regulator when tied to GND-required for reliable operation below 3.5V input-but must remain floating above 3.5V to avoid latchup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.5V–12V: supports single-supply systems from low-power sensors to industrial rails; LV pin required for full range down to 1.5V. |
| Oscillator Frequency | 5–10 kHz (free-running at 5V); BOOST pin raises to ~35 kHz-directly reduces output impedance and ripple without larger capacitors. |
| Output Source Resistance | 60 Ω typ. at 20 mA, 5V input: defines maximum load regulation error and voltage droop under dynamic current steps. |
| Power Efficiency | ≥96% at 5 kΩ load: minimizes thermal rise and input current draw in battery-powered instrumentation. |
| Voltage Conversion Efficiency | ≥99% open-circuit: ensures near-ideal inversion with negligible quiescent loss when unloaded. |
| Supply Current | 80 µA typ. at 25°C, 5V: enables ultra-low-power negative rail generation in always-on monitoring circuits. |
| Operating Temperature | 0°C to +70°C: validated for commercial-grade embedded control and interface applications. |
Pinout & Package
ICL7660CPA uses an 8-lead plastic dual in-line package (PDIP), 0.300" wide, with standard through-hole mounting and RoHS-compliant Pb-free finish (E8.3 drawing).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BOOST) | Oscillator boost control | Connect to V+ to raise switching frequency ~3.5×, lowering output impedance and enabling smaller external capacitors. |
| 2 (CAP+) | Charge pump capacitor connection | Anode of primary pump capacitor C1; carries full switching current-requires low-ESR electrolytic or ceramic. |
| 3 (GND) | Ground reference | System ground return for all internal circuitry and external capacitors; critical for latchup prevention. |
| 4 (CAP−) | Charge reservoir capacitor connection | Cathode of reservoir capacitor C2; forms negative output node-must not exceed GND potential to avoid latchup. |
| 5 (VOUT) | Negative output terminal | Delivers inverted voltage (–VIN); output impedance depends on switching frequency, C1/C2 values, and ESR. |
| 6 (OSC) | Oscillator timing node | Accepts external capacitor to lower frequency or external clock (via 1 kΩ series resistor) for noise-sensitive applications. |
| 7 (LV) | Low-voltage mode enable | Tie to GND for inputs ≤3.5V to bypass internal regulator; leave floating for 3.5V–12V to prevent latchup. |
| 8 (V+) | Positive input supply | Main power input; accepts 1.5V–12V; internal regulator drops ~0.5V when LV is floating. |
Key Features
| Feature | Design Value |
|---|---|
| BOOST pin for frequency scaling | Enables 3.5× higher oscillator frequency to reduce output impedance-allows use of 0.1 µF instead of 10 µF capacitors in surface-mount designs. |
| LV pin for low-voltage optimization | Bypasses internal regulator below 3.5V input, extending functional range to 1.5V while maintaining latchup immunity. |
| Guaranteed 96% power efficiency | Minimizes heat generation and input current in portable instrumentation where battery life and thermal management are critical. |
| 99% open-circuit voltage conversion efficiency | Ensures minimal voltage loss during idle or light-load conditions-essential for precision analog front-ends requiring stable negative bias. |
| Integrated SCR latchup protection | Active substrate bias control prevents destructive latchup across full temperature and voltage range without external diodes. |
Applications
| RS-232 Interface Power | Negative Supply for Data Acquisition |
|---|---|
Use Scenario: Generating –5V to –12V from a single +5V microcontroller supply to drive RS-232 transceivers (e.g., MAX232 alternatives). IC Role / Device Role / Timing Role: Charge-pump voltage inverter providing isolated negative rail; no timing synchronization required-self-oscillating operation. Use Value: Eliminates need for external inductors or transformers; enables compact, low-cost RS-232 level-shifting in embedded serial ports. | Use Scenario: Supplying clean –5V bias to op-amps, ADC references, or sensor signal conditioning stages in portable test equipment. IC Role / Device Role / Timing Role: Precision negative rail generator; output impedance directly impacts analog accuracy under varying load currents. Use Value: 60 Ω typical output resistance and 99% open-circuit efficiency maintain stable bias voltage across sensor load transients. |
| Logic Supply Splitter | Low-Power Instrumentation Bias |
Use Scenario: Converting +5V logic supply into ±5V dual rails for op-amp-based active filters or comparator circuits in mixed-signal PCBs. IC Role / Device Role / Timing Role: Bidirectional voltage converter used in split-rail configuration; LV pin tied to GND for optimal low-voltage regulation. Use Value: Enables true bipolar operation of rail-to-rail op-amps without dedicated negative regulators-reducing BOM count and board area. | Use Scenario: Providing –3V to –5V bias for low-power analog sensors (e.g., MEMS accelerometers, thermopiles) in battery-operated IoT nodes. IC Role / Device Role / Timing Role: Ultra-low-quiescent-current (80 µA typ.) inverter supporting always-on sensing modes with minimal battery drain. Use Value: 1.5V minimum input allows operation directly from partially discharged Li-ion cells or coin-cell sources. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICL7660SCPAZ | Pb-free PDIP variant with identical electrical specs and 0°C to +70°C rating; same pinout and footprint. | RoHS-compliant replacement for new designs requiring lead-free assembly; compatible with wave solder only. | Select ICL7660SCPAZ for new production where Pb-free compliance is mandatory and through-hole assembly is used. |
| MAX1044CPA | Higher 35 kHz max oscillator frequency; 40 µA typ. supply current at 5V; requires external timing capacitor for frequency control. | Better suited for high-frequency, low-ripple applications; lacks BOOST pin-frequency adjustment less flexible than ICL7660CPA. | Choose MAX1044CPA when lower output impedance and tighter ripple control are prioritized over pin-level simplicity and integrated BOOST functionality. |
Compared with ICL7660CPA, ICL7660SCPAZ offers identical performance with RoHS compliance, while MAX1044CPA delivers lower quiescent current and higher base frequency but requires external timing components and lacks the BOOST pin's ease of impedance optimization.
Availability
ICL7660CPA is available at Aetrix Electronics and suitable for RS-232 interface power, data acquisition system biasing, and logic supply splitting requiring stable component supply across commercial temperature grades.
Supply support for ICL7660CPA 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
Renesas Electronics (formerly Intersil) is a global semiconductor leader specializing in analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The ICL7660CPA belongs to Renesas' legacy Super Voltage Converter family, designed specifically for low-noise, inductorless DC/DC voltage inversion in space- and cost-constrained analog and interface subsystems.
FAQ
What is the minimum input voltage supported by the ICL7660CPA?
The ICL7660CPA supports a minimum input voltage of 1.5V when the LV pin is tied to GND to bypass the internal series regulator. This configuration is mandatory below 3.5V input to ensure proper start-up and latchup immunity. At 1.5V input, the device delivers approximately –1.5V output with reduced efficiency and higher output impedance compared to higher input voltages. The ICL7660CPA maintains guaranteed operation across its full 0°C to +70°C commercial temperature range at this minimum voltage.
How does the BOOST pin on the ICL7660CPA affect output performance?
The BOOST pin (Pin 1) on the ICL7660CPA, when connected to V+, increases the internal oscillator frequency by approximately 3.5×-e.g., from 10 kHz to ~35 kHz. This higher switching frequency directly lowers output source resistance and reduces output voltage ripple, enabling the use of smaller external pump and reservoir capacitors (e.g., 0.1 µF instead of 10 µF). The ICL7660CPA's BOOST functionality is unique among legacy charge pumps and provides a simple, pin-controlled method to optimize impedance without redesigning the timing network.
Can the ICL7660CPA be used as a voltage doubler?
Yes, the ICL7660CPA can be configured as a positive voltage doubler using an external diode network (per Figure 18 in FN3179), generating up to 22.8V from a 12V input. In this mode, it leverages the same internal charge-pump switches but reorients the external capacitor and diode connections to sum voltages rather than invert them. Output source impedance remains dependent on switching frequency and capacitor selection, and the ICL7660CPA maintains its 96% minimum power efficiency in doubler configuration under specified load conditions.
Is an external Schottky diode required for safe operation of the ICL7660CPA?
An external Schottky diode from VOUT (Pin 5) to CAP− (Pin 4) is recommended-and sometimes required-for ICL7660CPA operation when the input voltage exceeds 5V and has a fast rise time (>2 V/µs), or when the input supply has high source impedance. This diode prevents forward-biasing the body diode of internal switch Q4, which could trigger SCR latchup. The ICL7660CPA itself is designed to operate without external diodes across its full voltage and temperature range, but the diode serves as a robustness enhancement in marginal conditions.
What is the function of the LV pin on the ICL7660CPA, and how should it be connected?
The LV (Low-Voltage) pin (Pin 7) on the ICL7660CPA controls the internal series regulator: tying it to GND disables the regulator to improve efficiency and enable operation down to 1.5V input, while leaving it floating activates the regulator for inputs above 3.5V to prevent latchup. Incorrect connection-such as grounding LV at >3.5V-will cause device failure. For the ICL7660CPA operating at 5V input, LV must remain unconnected (floating); at 2.5V input, LV must be hard-connected to GND. This dual-mode behavior is intrinsic to the ICL7660CPA's design and is not optional.
ICL7660CPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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):
- 10V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 45mA
- Frequency - Switching:
- 10kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
ICL7660CPA FAQ
1.How can I place an order for ICL7660CPA through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7660CPA 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 ICL7660CPA reliable?
The price and inventory of ICL7660CPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7660CPA is usually 5 days.
3.What payment methods are accepted for ICL7660CPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7660CPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7660CPA?
ICL7660CPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7660CPA 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 ICL7660CPA?
For technical support, including ICL7660CPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7660CPA requirements.
6.How does Aetrix verify that ICL7660CPA is sourced from the original manufacturer or authorized distributors?
All ICL7660CPA 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 ICL7660CPA meets industry standards.
7.What is the process for return or replacement of ICL7660CPA?
All ICL7660CPA units undergo pre-shipment inspection (PSI). If there is an issue with ICL7660CPA, 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 ICL7660CPA part is unused and in its original packaging.
Return procedure for ICL7660CPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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