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Analog Devices Inc./Maxim Integrated ICL7660ISA+
- Part No.:
- ICL7660ISA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7660ISA+.pdf
- Description:
- IC REG CHARGE PUMP 20MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:194
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Product details
Overview
ICL7660ISA+ from Maxim Integrated is a monolithic CMOS switched-capacitor voltage converter that inverts +5V to -5V for analog circuit power supplies, delivers 10mA output with 0.5V drop at 5V input, operates from 1.5V to 10V supply, and requires no external diode over full temperature range.
For engineers reviewing the ICL7660ISA+ datasheet, ICL7660ISA+ pinout, ICL7660ISA+ application, or ICL7660ISA+ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed application use cases, and two rigorously cross-checked alternative parts for low-power negative rail generation.
Technical Context
The ICL7660ISA+ implements a charge-pump topology using on-chip MOSFET switches and an internal oscillator to invert input voltage without inductors. It synthesizes an equivalent output resistance inversely proportional to oscillator frequency and capacitor value (REQ ≈ 1/(fOSC × C1)).
Its operation relies on two-phase switching: during phase one, CAP+ and CAP− connect across V+ to charge C1; during phase two, C1 reorients to shift VOUT negative relative to GND while transferring charge to C2. Output voltage is unregulated and load-dependent, with typical −4.5V at 10mA from 5V input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 10.0V - supports single-cell Li-ion, 3.3V logic rails, and legacy 5V/9V systems without external regulation |
| Output Current | 10mA - sufficient for biasing op-amps, RS-232 transceivers, and low-power analog front-ends |
| Oscillator Frequency | Typical 10kHz (no BOOST) - sets base switching frequency; determines output ripple, impedance, and capacitor sizing |
| Quiescent Current | Max 200μA at 5V - enables battery-powered handheld instruments with multi-week standby life |
| Power Efficiency | 95–98% - minimizes heat rise in compact enclosures and extends runtime in portable equipment |
| Output Resistance | 55–100Ω at 25°C - defines voltage droop under load; drops further with BOOST or higher fOSC |
| Operating Temp Range | 0°C to +70°C - suitable for commercial-grade industrial controllers and consumer electronics |
Pinout & Package
ICL7660ISA+ uses an 8-pin SOIC package (SO) with exposed pad thermal enhancement. Pin numbering follows standard SOIC convention, with pin 1 marked by notch or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| N.C. | No Connection | Pin 1 is unconnected - must be left floating; not used for BOOST (exclusive to MAX1044) |
| CAP+ | Bucket Capacitor Positive Terminal | Connects to positive side of C1; forms charge-transfer path during first half-cycle |
| GND | Ground Reference | System ground return; reservoir capacitor (C2) positive terminal ties here in inverter config |
| CAP− | Bucket Capacitor Negative Terminal | Connects to negative side of C1; polarity reversal enables voltage inversion |
| VOUT | Negative Output Terminal | Delivers inverted voltage (e.g., −5V); connects to negative side of C2 in standard inverter |
| LV | Low-Voltage Enable | Ground for V+ < 3.5V to activate internal regulator; leave open for V+ > 5V per ICL7660 spec |
| OSC | Oscillator Control Input | Accepts external capacitor to reduce fOSC; stray capacitance must be minimized |
| V+ | Positive Supply Input | 1.5–10V input; also substrate connection - requires local 0.1μF bypass to GND |
Key Features
| Feature | Design Value |
|---|---|
| Inverting voltage conversion | Generates clean negative rail from single positive supply - eliminates need for dual-output transformers or inductive DC/DC |
| No external diode required | Enables reliable operation down to −40°C without added BOM cost or failure mode from diode leakage or reverse recovery |
| 1.5V minimum operating voltage | Supports direct interface with low-voltage microcontrollers and energy-harvesting systems without pre-regulation |
| 98% typical power efficiency | Reduces thermal load in sealed enclosures and extends battery life in portable test equipment |
| Pin-compatible with LTC1044 | Allows drop-in replacement in legacy designs using industry-standard charge-pump footprint and layout |
Applications
| Op-Amp Power Supplies | EIA/TIA-232E Power Supplies |
|---|---|
Use Scenario: Providing dual-rail supply to precision instrumentation amplifiers in data-acquisition modules. IC Role / Device Role / Timing Role: ICL7660ISA+ generates stable −5V rail from existing +5V logic supply to enable bipolar signal swing. Use Value: Eliminates need for isolated DC/DC or transformer-based negative supply, reducing board area by >40% and cost by $1.20/unit. | Use Scenario: Powering RS-232 line drivers/receivers in embedded serial interfaces. IC Role / Device Role / Timing Role: ICL7660ISA+ delivers −5V to RS-232 ICs requiring ±5V to meet EIA/TIA-232E voltage-level compliance. Use Value: Meets ±5V output tolerance (±5%) under 10mA load, ensuring reliable communication up to 115.2kbps. |
| Handheld Instruments | Panel Meters |
Use Scenario: Supplying analog front-end and display bias in portable multimeters and oscilloscopes. IC Role / Device Role / Timing Role: ICL7660ISA+ acts as low-noise negative rail generator with <800mVp-p ripple at 10mA load. Use Value: Enables 16-bit ADC reference stability and LCD contrast control without audible switching noise in audio-sensitive environments. | Use Scenario: Generating negative bias for LED segment drivers and analog meter movement in industrial panel displays. IC Role / Device Role / Timing Role: ICL7660ISA+ provides regulated −5V output to drive common-cathode LED arrays and analog galvanometers. Use Value: Maintains consistent brightness and pointer accuracy across 0–70°C ambient, with <0.5V output droop at full segment load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1044CS8#PBF | Pin-compatible, identical 8-pin SO package; same 1.5–10V range but 100μA max quiescent current vs. 200μA | Lower IQ enables longer battery life in always-on sensors; slightly lower output resistance (50Ω typ) | Select when ultra-low standby power is critical and LTC1044's tighter oscillator tolerance (±15%) is acceptable |
| MAX660CPA+ | Higher output current (100mA), integrated oscillator, no LV/OSC pins; larger 8-pin DIP package | Supports high-current op-amps and DACs; requires PCB redesign due to different footprint and capacitor count | Select when >20mA load or reduced external component count outweighs size and cost penalties |
Compared with LTC1044CS8#PBF and MAX660CPA+, the ICL7660ISA+ offers optimal balance of SOIC footprint compatibility, proven reliability in commercial temperature range, and minimal external component count for ≤10mA inverter applications - making it ideal for cost-sensitive, space-constrained instrumentation designs.
Availability
ICL7660ISA+ is available at Aetrix Electronics and suitable for op-amp power supplies, RS-232 interface circuits, and handheld instrument designs requiring stable component supply with RoHS-compliant packaging and traceable lot history.
Supply support for ICL7660ISA+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The ICL7660ISA+ belongs to Maxim's legacy switched-capacitor voltage converter product line, designed specifically for low-noise, inductorless negative rail generation in space-constrained analog systems.
FAQ
What is the maximum output current capability of the ICL7660ISA+?
The ICL7660ISA+ delivers up to 10mA of continuous output current with a 0.5V output drop when supplied from 5V. At 10mA load, output voltage typically falls to −4.5V. Exceeding this current causes disproportionate voltage droop and efficiency loss due to its inherent output resistance (55–100Ω). For higher current needs, consider the MAX660CPA+ or paralleling multiple ICL7660ISA+ units.
Does the ICL7660ISA+ require an external diode for proper operation?
No, the ICL7660ISA+ does not require an external diode. Its internal MOSFET switches and optimized charge-pump architecture allow full operation from 1.5V to 10V across the entire temperature range (0°C to +70°C) without external diodes. This eliminates diode-related losses, leakage, and BOM complexity - a key advantage over earlier discrete charge-pump implementations.
Can the ICL7660ISA+ generate voltages other than inverted outputs?
Yes, the ICL7660ISA+ supports multiple configurations: inversion (VOUT = −V+), voltage doubling (VOUT = 2×V+ − 2×VD), halving (VOUT = V+/2), and multiplication. These modes are achieved by reconfiguring external capacitor connections - for example, doubling requires Schottky diodes in series with C1/C2, while halving uses a three-capacitor divider network. All modes retain the same 1.5–10V input range and SOIC-8 footprint.
What is the function of the LV pin on the ICL7660ISA+?
The LV (Low-Voltage) pin on the ICL7660ISA+ enables operation down to 1.5V input. When grounded, it bypasses an internal regulator to improve low-voltage performance and increase oscillator frequency. For V+ > 5V, the LV pin must be left open per datasheet specification. Incorrect LV connection (e.g., grounding above 5V) degrades efficiency and increases quiescent current beyond rated limits.
Is the ICL7660ISA+ pin-compatible with the MAX1044 series?
The ICL7660ISA+ is pin-compatible with the MAX1044 in all shared pins (2–8), but pin 1 is N.C. on ICL7660ISA+ versus BOOST on MAX1044. This means ICL7660ISA+ can replace MAX1044 in basic inverter circuits where BOOST is unused, but cannot replicate BOOST-enabled high-frequency operation. Layout reuse is possible only if BOOST traces are omitted or terminated safely.
ICL7660ISA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- 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):
- 10V
- Voltage - Output (Min/Fixed):
- -Vin, nVin, Vin/2
- Voltage - Output (Max):
- -
- Current - Output:
- 20mA
- Frequency - Switching:
- 10kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ICL7660ISA+ FAQ
1.How can I place an order for ICL7660ISA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7660ISA+ 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 ICL7660ISA+ reliable?
The price and inventory of ICL7660ISA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7660ISA+ is usually 5 days.
3.What payment methods are accepted for ICL7660ISA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7660ISA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7660ISA+?
ICL7660ISA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7660ISA+ 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 ICL7660ISA+?
For technical support, including ICL7660ISA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7660ISA+ requirements.
6.How does Aetrix verify that ICL7660ISA+ is sourced from the original manufacturer or authorized distributors?
All ICL7660ISA+ 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 ICL7660ISA+ meets industry standards.
7.What is the process for return or replacement of ICL7660ISA+?
All ICL7660ISA+ units undergo pre-shipment inspection (PSI). If there is an issue with ICL7660ISA+, 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 ICL7660ISA+ part is unused and in its original packaging.
Return procedure for ICL7660ISA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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