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Analog Devices Inc./Maxim Integrated ICL7660CUA+
- Part No.:
- ICL7660CUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ICL7660CUA+.pdf
- Description:
- IC REG CHARGE PUMP 20MA 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,299
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Product details
Overview
ICL7660CUA+ from Maxim Integrated is a monolithic CMOS switched-capacitor voltage converter that inverts +5V to -5V for analog power rails, delivers 10mA output with ≤0.5V drop at 5V input, operates from 1.5V to 10V supply, and requires no external diodes over its full temperature range (0°C to +70°C). It serves as a compact, low-quiescent-current (-5V) supply generator in portable instrumentation and RS-232 interface circuits.
For engineers reviewing the ICL7660CUA+ datasheet, ICL7660CUA+ pinout, ICL7660CUA+ application, or ICL7660CUA+ equivalent, this page provides verified specifications, validated μMAX-8 package mapping, confirmed 8-pin terminal roles, real-world efficiency and output resistance data, and two field-validated alternative parts with documented functional and application differences.
Technical Context
The ICL7660CUA+ implements a charge-pump topology using four on-chip MOSFET switches and an internal oscillator to synthesize negative voltage without inductors. Its operation relies on alternating charge transfer between external bucket (C1) and reservoir (C2) capacitors, with output voltage unregulated and load-dependent.
It supports multiple configurations - inversion (VOUT = –V+), doubling (VOUT = 2V+ – 2VD), division, and multiplication - via external component routing. Oscillator frequency is internally set at ~10kHz (typical) and can be adjusted via the OSC pin or disabled in favor of external clocking up to 400kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 10.0V - enables direct use from single-cell Li-ion (3.0V), 3.3V logic rails, or 5V USB supplies without pre-regulation. |
| No-Load Supply Current | ≤200μA at 5V - ensures minimal battery drain in always-on portable systems. |
| Output Current Capability | 10mA with ≤0.5V drop at V+ = 5V - sufficient for biasing op-amps, RS-232 transceivers, and low-power ADCs. |
| Power Conversion Efficiency | 95–98% typical at RL = 5kΩ - reduces thermal load and extends runtime versus linear regulators. |
| Oscillator Frequency | ~10kHz typical (ICL7660 variant) - balances ripple, capacitor size, and quiescent current for general-purpose inversion. |
| Output Resistance | 55–100Ω at TA = +25°C, fOSC = 5kHz - defines load regulation slope: ~0.5V drop per 10mA load. |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade embedded and consumer electronics applications. |
Pinout & Package
ICL7660CUA+ uses the 8-pin μMAX package (3mm × 3mm, 0.8mm height), pin-compatible with industry-standard SO-8 and PDIP-8 footprints but offering 40% smaller board area. Thermal performance is rated at 330mW continuous dissipation at +70°C (derating 4.1mW/°C above).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (N.C.) | No Connection | Unused terminal - must remain unconnected; not bonded internally on ICL7660CUA+ die. |
| 2 (CAP+) | Bucket Capacitor Positive Terminal | Connects to positive lead of C1; switching node where charge accumulates during first half-cycle. |
| 3 (GND) | Ground Reference | System ground return; reservoir capacitor (C2) positive terminal connects here in standard inverter configuration. |
| 4 (CAP-) | Bucket Capacitor Negative Terminal | Connects to negative lead of C1; alternately tied to V+ and VOUT during charge-transfer phases. |
| 5 (VOUT) | Negative Output Terminal | Delivers inverted voltage (e.g., –5V); reservoir capacitor (C2) negative terminal connects here. |
| 6 (LV) | Low-Voltage Operation Control | Ground for V+ < 3.5V to enable internal regulator bypass; leave open for V+ > 5V per ICL7660 specification. |
| 7 (OSC) | Oscillator Frequency Control | Accepts external capacitor (COSC) to reduce frequency or external clock (up to 400kHz) for synchronization/noise control. |
| 8 (V+) | Positive Input Supply | Main power input (1.5–10V); also serves as substrate connection - must be decoupled with 0.1μF ceramic near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting voltage conversion | Generates regulated-free –V+ output from single positive rail, eliminating need for dual supplies in analog signal chains. |
| No external diode required | On-chip MOSFET switches replace discrete diodes, reducing BOM count, forward-drop losses, and PCB footprint. |
| 1.5V minimum operating voltage | Enables operation directly from single alkaline or NiMH cells, supporting ultra-low-power portable designs. |
| 98% typical power-conversion efficiency | Minimizes heat generation and extends battery life compared to linear inverters or transformer-based solutions. |
| μMAX-8 package | 3mm × 3mm footprint with exposed pad improves thermal dissipation and saves >40% board space vs. SO-8. |
Applications
| Op-Amp Power Supplies | EIA/TIA-232E Power Supplies |
|---|---|
Use Scenario: Providing dual-rail ±5V supply to precision operational amplifiers in handheld test equipment. IC Role / Device Role / Timing Role: Inverting +5V logic supply to generate clean –5V rail; operates as unregulated charge-pump converter with fixed 10kHz switching. Use Value: Eliminates need for bulky inductive DC/DC converters or split-battery supplies while maintaining <0.5V output droop at 10mA load. | Use Scenario: Generating ±12V RS-232 driver voltages from a single 5V microcontroller supply in industrial serial interfaces. IC Role / Device Role / Timing Role: Primary negative voltage source for TIA-232E compliant transceivers (e.g., MAX232 family); configured in standard inverter topology with 10μF pump capacitors. Use Value: Delivers stable –5V to –10V output under pulsed load conditions, meeting EIA/TIA-232E driver voltage swing requirements without external diodes. |
| Portable Telephones | Handheld Instruments |
Use Scenario: Biasing RF front-end components and audio codecs in GSM/GPRS handsets with tight power budgets. IC Role / Device Role / Timing Role: Low-quiescent-current (≤200μA) negative supply generator; LV pin grounded to extend operation down to 1.5V battery voltage. Use Value: Maintains functionality through full battery discharge curve while consuming <0.1mW idle power - critical for standby-time optimization. | Use Scenario: Powering analog front-ends and LCD bias circuits in battery-operated multimeters and oscilloscope probes. IC Role / Device Role / Timing Role: Compact, capacitor-only voltage inverter enabling single-supply design; μMAX-8 package minimizes PCB area in space-constrained enclosures. Use Value: Achieves –5V output with <100mVpp ripple at 5mA load using only two 10μF X5R ceramics - simplifies layout and reduces bill-of-materials cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1044CSA+ | Includes BOOST pin (pin 1) enabling 6× oscillator frequency increase; otherwise identical pinout and electrical specs. | Better suited for noise-sensitive applications requiring >40kHz switching to move ripple out of audio band. | Select MAX1044CSA+ when lower output impedance, reduced capacitor size, or EMI mitigation is required - no PCB change needed due to pin compatibility. |
| TC7660CPA | Microchip's second-source version; same 8-pin DIP/SO footprint, 1.5–10V range, and 10mA capability; tested to identical electrical limits. | Preferred for long-term supply continuity in legacy DIP-8 designs where μMAX-8 rework is impractical. | Choose TC7660CPA for drop-in replacement in through-hole assemblies or where Microchip's extended product longevity program applies. |
Compared with ICL7660CUA+, MAX1044CSA+ offers higher-frequency operation for improved ripple and output impedance but increases quiescent current, while TC7660CPA provides identical function in DIP-8 packaging for backward compatibility - neither requires layout changes, but only MAX1044CSA+ delivers measurable performance uplift in high-frequency or low-impedance applications.
Availability
ICL7660CUA+ is available at Aetrix Electronics and suitable for portable telephones, handheld instruments, and RS-232 interface circuits requiring stable component supply across commercial temperature ranges and long production lifecycles.
Supply support for ICL7660CUA+ 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
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The ICL7660CUA+ belongs to Maxim's legacy switched-capacitor voltage converter family, engineered specifically to replace discrete diode-capacitor inverters with monolithic, low-noise, low-quiescent-current solutions for space- and power-constrained analog subsystems.
FAQ
What is the maximum output current of the ICL7660CUA+ and how does it vary with input voltage?
The ICL7660CUA+ delivers up to 10mA output current with ≤0.5V drop when V+ = 5V. At V+ = 3.3V, maximum output drops to ~6mA due to increased output resistance and reduced headroom; at V+ = 10V, it sustains ~10mA but with higher quiescent current. Load regulation is defined by output resistance (55–150Ω depending on temperature and frequency), not current limiting.
Does the ICL7660CUA+ require external diodes for operation?
No, the ICL7660CUA+ does not require external diodes. Its on-chip MOSFET switches perform bidirectional charge transfer, eliminating forward-voltage drop and reverse-recovery losses. This is explicitly guaranteed across the full 0°C to +70°C temperature range and 1.5V to 10V supply range per the datasheet Absolute Maximum Ratings and Electrical Characteristics tables.
What is the function of the LV pin on the ICL7660CUA+ and how should it be connected?
The LV pin on the ICL7660CUA+ bypasses an internal voltage regulator to enable operation down to 1.5V. For V+ < 3.5V, connect LV to GND; for V+ > 5V, leave LV open. Incorrect connection (e.g., grounding LV at 5V) increases quiescent current by ~100μA and reduces efficiency - per Pin Description and Design Information sections.
Can the ICL7660CUA+ be used to generate a positive doubled voltage (2×V+)?
Yes, the ICL7660CUA+ supports voltage doubling in addition to inversion. Using the Figure 9 application circuit with Schottky diodes, it generates VOUT ≈ 2V+ – 2VD. However, output current is reduced (~5mA max at 5V input) due to diode losses and higher effective output resistance; for higher current, the MAX660 is recommended per Applications section.
What package type and RoHS status does the ICL7660CUA+ have?
The ICL7660CUA+ uses the 8-pin μMAX package (3mm × 3mm, 0.8mm height) with exposed thermal pad. The "+" suffix confirms full RoHS compliance (Pb-free, halogen-free) per Maxim's package coding convention and Package Information section - verified against Maxim's official package drawings and ordering information table.
ICL7660CUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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):
- 10V
- Voltage - Output (Min/Fixed):
- -Vin, nVin, Vin/2
- Voltage - Output (Max):
- -
- Current - Output:
- 20mA
- Frequency - Switching:
- 10kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
ICL7660CUA+ FAQ
1.How can I place an order for ICL7660CUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7660CUA+ 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 ICL7660CUA+ reliable?
The price and inventory of ICL7660CUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7660CUA+ is usually 5 days.
3.What payment methods are accepted for ICL7660CUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7660CUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7660CUA+?
ICL7660CUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7660CUA+ 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 ICL7660CUA+?
For technical support, including ICL7660CUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7660CUA+ requirements.
6.How does Aetrix verify that ICL7660CUA+ is sourced from the original manufacturer or authorized distributors?
All ICL7660CUA+ 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 ICL7660CUA+ meets industry standards.
7.What is the process for return or replacement of ICL7660CUA+?
All ICL7660CUA+ units undergo pre-shipment inspection (PSI). If there is an issue with ICL7660CUA+, 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 ICL7660CUA+ part is unused and in its original packaging.
Return procedure for ICL7660CUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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