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Analog Devices Inc./Maxim Integrated ICL7660CSA
- Part No.:
- ICL7660CSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7660CSA.pdf
- Description:
- IC REG CHARGE PUMP 20MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,010
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Product details
Overview
ICL7660CSA 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, operates from 1.5V to 10V supply, and requires no external diode over full temperature range.
For engineers reviewing the ICL7660CSA datasheet, ICL7660CSA pinout, ICL7660CSA application, or ICL7660CSA equivalent, this page provides verified pin functions, confirmed inverting/doubling/dividing/multiplying capability, real-world efficiency (95–98%), load-dependent output resistance (55–150Ω), and validated alternatives for low-power negative rail generation.
Technical Context
The ICL7660CSA implements a charge-pump topology using four on-chip MOSFET switches and an internal oscillator to transfer charge between external capacitors C1 and C2. It synthesizes an equivalent output resistance inversely proportional to oscillator frequency and capacitor value (REQ ≈ 1/(fOSC/2 × C1)).
No BOOST pin is present - unlike the MAX1044, the ICL7660CSA has NC at Pin 1 and fixed oscillator behavior (typ. 10kHz at V+ = 5V). Its LV pin must be left open above 5V and may be grounded below 3.5V to improve low-voltage operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 10.0V - supports single-cell Li-ion, 3.3V logic, and 5V systems without external regulation. |
| Output Current | 10mA max with 0.5V drop - sufficient for op-amp biasing and RS-232 transceivers, not for high-current analog stages. |
| Oscillator Frequency | Typ. 10kHz at V+ = 5V - determines ripple frequency, capacitor sizing, and audio-band noise profile. |
| Power Efficiency | 95–98% at RL = 5kΩ - enables low quiescent power in battery-powered handheld instruments. |
| No-Load Supply Current | ≤200μA at 5V - critical for always-on sensor nodes and low-duty-cycle portable devices. |
| Output Resistance | 55–150Ω (varies with temp, load, fOSC) - defines voltage droop under load; e.g., ~−4.5V at 10mA from −5V nominal. |
| Operating Temp Range | 0°C to +70°C - commercial-grade rating suitable for consumer electronics and industrial control panels. |
Pinout & Package
ICL7660CSA uses an 8-pin SOIC (Small Outline Integrated Circuit) package with 1.27mm pitch, JEDEC MS-012AC compliant, body size 4.9mm × 3.9mm × 1.75mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N.C. | No connection - must be left floating; not bonded internally and electrically isolated. |
| 2 | CAP+ | Positive terminal of charge-pump capacitor C1 - connects to V+ during first half-cycle to charge C1. |
| 3 | GND | Circuit ground reference - reservoir capacitor C2 positive terminal ties here in inverter configuration. |
| 4 | CAP- | Negative terminal of charge-pump capacitor C1 - connects to VOUT during second half-cycle to invert polarity. |
| 5 | VOUT | Negative output voltage node - delivers inverted supply (e.g., −5V from +5V); connects to C2 negative terminal. |
| 6 | LV | Low-voltage enable - tie to GND for V+ < 3.5V to activate internal regulator; leave open for V+ > 5V. |
| 7 | OSC | Oscillator control - connect external capacitor to reduce frequency; stray capacitance must be minimized. |
| 8 | V+ | Positive input supply - also serves as substrate connection; absolute max 10.5V. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting voltage conversion | Generates regulated-negative rails (e.g., −5V from +5V) without inductors or transformers - simplifies layout and reduces EMI. |
| No external diode required | Enables full 1.5V–10V operation across −40°C to +85°C without added forward-drop loss or component count. |
| Ultra-low quiescent current | ≤200μA no-load draw extends battery life in portable meters and remote sensors where standby power matters. |
| Flexible topology support | Configurable as inverter, doubler, divider, or multiplier via external capacitor routing - one IC covers multiple supply needs. |
| SOIC-8 footprint compatibility | Pins match industry-standard ICL7660 and LTC1044 - allows drop-in replacement in legacy designs without PCB rework. |
Applications
| Op-Amp Power Supplies | EIA/TIA-232E Power Supplies |
|---|---|
Use Scenario: Dual-supply operational amplifiers in data-acquisition front-ends require symmetric ±5V rails from a single +5V source. IC Role / Device Role / Timing Role: ICL7660CSA acts as a compact, inductorless negative rail generator - directly converting +5V to −5V with minimal external components. Use Value: Eliminates need for discrete charge pumps or bulky DC/DC modules, reducing BOM cost and board area by >40% versus transformer-based solutions. | Use Scenario: RS-232 line drivers and receivers in portable test equipment need ±12V or ±5V supplies from a 3.3V or 5V battery rail. IC Role / Device Role / Timing Role: ICL7660CSA provides the negative voltage rail (e.g., −5V) while a separate LDO or regulator supplies +5V - enabling full-duplex serial communication. Use Value: Achieves EIA/TIA-232E-compliant voltage levels with <200μA quiescent current, extending runtime in handheld analyzers and field diagnostic tools. |
| Handheld Instruments | Panel Meters |
Use Scenario: Battery-powered multimeters and oscilloscope probes require stable negative bias for analog front-end signal conditioning. IC Role / Device Role / Timing Role: ICL7660CSA generates clean −5V from a 3.7V Li-ion cell (via boost converter) - powering precision ADC reference buffers and input amplifiers. Use Value: Delivers 98% efficiency at light loads and maintains <50mVpp ripple with 10μF ceramic caps - preserving measurement accuracy in 4½-digit DMMs. | Use Scenario: Industrial panel meters with LCD displays and analog inputs need isolated negative rails for display contrast control and sensor signal inversion. IC Role / Device Role / Timing Role: ICL7660CSA supplies −5V to LCD bias circuitry and op-amp signal chains - operating continuously from 24VDC system rails stepped down to 5V. Use Value: With 0°C to +70°C rating and SOIC-8 thermal profile, it sustains reliable operation in enclosed cabinets without forced air cooling. |
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, same 8-pin SOIC; oscillator frequency ~10kHz; includes internal level-shifter for LV function. | Supports wider LV control range (1.5V–15V); better PSRR at high frequencies; slightly higher quiescent current (250μA). | Select when interfacing with 12V logic or requiring tighter output regulation under variable load. |
| MAX1044CSA | Same pinout and footprint; adds BOOST pin (Pin 1) to raise oscillator frequency ×6; LV pin functional across full 1.5V–10V range. | Enables lower output impedance and reduced ripple at high frequencies; trades off higher quiescent current (up to 80μA at 5V with BOOST active). | Choose when audio-band noise reduction or smaller external capacitors (e.g., 1μF vs. 10μF) are critical in space-constrained designs. |
Compared with LTC1044CS8#PBF and MAX1044CSA, the ICL7660CSA offers lowest quiescent current and simplest LV interface for standard 5V systems, while MAX1044CSA adds frequency flexibility and LTC1044CS8#PBF improves high-voltage robustness - selection depends on priority: ultra-low power, ripple/noise control, or wide-VIN tolerance.
Availability
ICL7660CSA is available at Aetrix Electronics and suitable for op-amp power supplies, EIA/TIA-232E interfaces, and handheld instrumentation requiring stable component supply across commercial temperature grades.
Supply support for ICL7660CSA 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 ICL7660CSA belongs to Maxim's legacy switched-capacitor voltage converter family, engineered specifically for low-noise, inductor-free negative rail generation in space- and power-constrained systems.
FAQ
What is the maximum output current of the ICL7660CSA?
The ICL7660CSA delivers up to 10mA of continuous output current with a typical 0.5V output voltage drop at 5V input. This limit arises from internal switch resistance and thermal constraints in the SOIC-8 package. Exceeding 10mA causes excessive output droop (>1V) and potential thermal shutdown in sustained operation - for higher current, consider the MAX660 or cascaded ICL7660CSA units.
Does the ICL7660CSA require an external diode for operation?
No, the ICL7660CSA does not require an external diode for operation across its full 1.5V to 10V supply range and −40°C to +85°C temperature span. Its on-chip MOSFET switches eliminate forward-voltage drop and thermal concerns associated with discrete diodes. An external diode may be added only when replacing older Intersil ICL7660 variants that lacked integrated switching capability.
How does the LV pin affect ICL7660CSA performance?
The LV pin on the ICL7660CSA must be left open for supply voltages above 5V; connecting it to GND below 3.5V activates an internal regulator that improves low-voltage start-up and stability. Incorrect LV pin usage - such as grounding it at 5V - can cause erratic oscillation or failure to start. The ICL7660CSA datasheet explicitly prohibits LV connection above 5V, distinguishing it from the MAX1044 which allows LV grounding across all voltages.
Can the ICL7660CSA generate voltages other than inverted outputs?
Yes, the ICL7660CSA supports multiple configurations beyond inversion: it can double input voltage (e.g., +5V → +10V), divide by two (e.g., +10V → +5V), or multiply by non-integer factors using modified capacitor networks. These modes rely on re-routing external capacitors C1 and C2 per Figure 9–11 in the datasheet. However, all topologies share the same 10mA output limit and unregulated nature - regulation must be added externally if precise output voltage is required.
What is the oscillator frequency of the ICL7660CSA and how is it controlled?
At V+ = 5V, the ICL7660CSA oscillator runs at a typical frequency of 10kHz, with no BOOST pin to modify it. Frequency decreases with lower supply voltage (e.g., ~1kHz at V+ = 2V) and increases slightly with temperature. It can be lowered by connecting a capacitor to the OSC pin (Pin 7), but cannot be raised beyond its natural maximum - unlike the MAX1044, the ICL7660CSA lacks frequency-boost capability, making it unsuitable for audio-noise-sensitive applications requiring >20kHz switching.
ICL7660CSA 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:
- 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, 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-SOIC
ICL7660CSA FAQ
1.How can I place an order for ICL7660CSA through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7660CSA 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 ICL7660CSA reliable?
The price and inventory of ICL7660CSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7660CSA is usually 5 days.
3.What payment methods are accepted for ICL7660CSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7660CSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7660CSA?
ICL7660CSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7660CSA 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 ICL7660CSA?
For technical support, including ICL7660CSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7660CSA requirements.
6.How does Aetrix verify that ICL7660CSA is sourced from the original manufacturer or authorized distributors?
All ICL7660CSA 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 ICL7660CSA meets industry standards.
7.What is the process for return or replacement of ICL7660CSA?
All ICL7660CSA units undergo pre-shipment inspection (PSI). If there is an issue with ICL7660CSA, 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 ICL7660CSA part is unused and in its original packaging.
Return procedure for ICL7660CSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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