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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:1,903
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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, operates from 1.5V to 10V input, delivers 10mA output with ≤0.5V drop at 5V input, achieves 98% typical power-conversion efficiency, 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 functional identity, confirmed SO-8 package mapping, validated 8-pin terminal roles, real-world load performance data (10mA @ 0.5V drop), and two industry-validated alternative parts with documented technical and application differences.
Technical Context
The ICL7660CSA+ implements a charge-pump topology using four on-chip power MOSFET switches and an internal oscillator to synthesize negative voltage without inductors. It supports inversion, doubling, division, and multiplication modes via external capacitor configuration.
Oscillator frequency is internally set at ~10kHz (typical) with no BOOST pin-unlike the MAX1044-and is adjustable via external capacitor on OSC pin or external clock up to 400kHz. LV pin must be left open for V+ > 5V operation per datasheet specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 10.0V - enables direct use from single-cell Li-ion or standard logic rails without pre-regulation |
| Output Current Capability | 10mA @ 0.5V drop (V+ = 5V) - sufficient for op-amp biasing and RS-232 interface ICs |
| Power Conversion Efficiency | 98% typical (RL = 5kΩ, fOSC = 5kHz) - minimizes heat rise in space-constrained portable designs |
| Oscillator Frequency | ~10kHz typical (COSC = 1pF, LV open) - audio-band switching; external capacitor or clock allows shift to ultrasonic frequencies |
| No-Load Supply Current | ≤200μA max at 5V - ensures low standby power in battery-powered handheld instruments |
| Operating Temperature Range | 0°C to +70°C - commercial-grade thermal envelope suitable for consumer and industrial control panels |
| Output Resistance | 55–100Ω (TA = +25°C, fOSC = 5kHz) - defines voltage droop under load; reduced by higher fOSC or larger C1/C2 |
Pinout & Package
ICL7660CSA+ is housed in an 8-pin SO (Small Outline) package with gull-wing leads, JEDEC MS-012AC compliant, 1.27mm pitch, body size 4.9mm × 6.0mm × 1.75mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (N.C.) | No Connection | Unused pin; must remain unconnected - not tied to BOOST as in MAX1044 |
| 2 (CAP+) | Charge-Pump Capacitor Positive Terminal | Connects to positive side of bucket capacitor C1; critical path for charge transfer timing |
| 3 (GND) | Ground Reference | Substrate and signal ground; reservoir capacitor C2 positive terminal connects here |
| 4 (CAP-) | Charge-Pump Capacitor Negative Terminal | Connects to negative side of bucket capacitor C1; forms charge-transfer loop with CAP+ |
| 5 (VOUT) | Negative Output Terminal | Delivers inverted voltage (e.g., -5V); reservoir capacitor C2 negative terminal connects here |
| 6 (LV) | Low-Voltage Operation Control | Must be left open for V+ > 5V; connect to GND only if V+ < 3.5V to enable sub-3.5V operation |
| 7 (OSC) | Oscillator Control Input | Accepts external capacitor (1pF–100pF) to reduce frequency or external HCMOS clock up to 400kHz |
| 8 (V+) | Positive Supply Input | Input rail (1.5–10V); also serves as substrate connection; bypass capacitor required between V+ and GND |
Key Features
| Feature | Design Value |
|---|---|
| Inverting voltage conversion | Generates regulated-negative rail (e.g., -5V from +5V) without inductors or external diodes |
| Wide input voltage range | Operates down to 1.5V - supports single-cell alkaline or LiFePO₄ battery inputs directly |
| No external diode required | On-chip MOSFET switches eliminate need for series diode, reducing BOM count and forward-drop loss |
| Adjustable oscillator frequency | Frequency tuned via OSC pin capacitor (1pF–100pF) or external clock - enables EMI optimization |
| Low quiescent current | ≤200μA max at 5V - extends battery life in always-on portable instrumentation |
Applications
| Op-Amp Power Supplies | EIA/TIA-232E Power Supplies |
|---|---|
Use Scenario: Dual-supply operational amplifiers in portable data loggers require symmetric ±5V rails from a single +5V source. IC Role / Device Role / Timing Role: ICL7660CSA+ acts as a compact, inductorless negative voltage generator, synchronizing charge-pump cycles to produce stable -5V output. Use Value: Eliminates need for bulky inductive DC/DC converters; maintains 98% efficiency at 5mA load with <10mV ripple. | Use Scenario: RS-232 transceivers (e.g., MAX232) require ±10V rails, but many modern systems supply only +3.3V or +5V. IC Role / Device Role / Timing Role: ICL7660CSA+ generates intermediate -5V rail, which feeds a second-stage doubler to reach -10V. Use Value: Enables legacy RS-232 compliance in space-constrained IoT gateways without redesigning power architecture. |
| Handheld Instruments | Panel Meters |
Use Scenario: Digital multimeters and portable oscilloscopes use precision analog front-ends requiring clean, low-noise negative bias. IC Role / Device Role / Timing Role: ICL7660CSA+ provides isolated -5V rail; OSC pin driven by external 100kHz clock shifts switching noise above audio band. Use Value: Reduces output ripple to <5mVp-p at 10mA, preserving ADC SNR in 16-bit measurement systems. | Use Scenario: Industrial panel meters powered from 24V DC supply need isolated -15V for LCD bias and op-amp references. IC Role / Device Role / Timing Role: ICL7660CSA+ cascaded with second unit (per Fig. 12) generates -10V, then -15V via resistor-divider feedback. Use Value: Achieves -15V at 2mA with <3% regulation error across 0–70°C - sufficient for 3½-digit display accuracy. |
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; higher quiescent current (≤225μA vs. ≤200μA) | Preferred where lower output impedance (<30Ω) or reduced capacitor size is required; supports LV = GND across full 1.5–10V range | Select MAX1044CSA+ when audio-band noise must be suppressed or when driving capacitive loads >100nF |
| ICL7660CUA | Same core functionality, but in 8-pin μMAX package (3mm × 3mm); identical electrical specs and pinout except N.C. pin 1 remains unused | Better suited for ultra-compact PCB layouts (e.g., wearable sensors); same thermal derating (4.1mW/°C) but smaller footprint | Choose ICL7660CUA when board area is constrained and SO-8 footprint cannot be accommodated |
Compared with ICL7660CSA+, MAX1044CSA+ offers superior dynamic response and noise immunity at the cost of slightly higher idle current, while ICL7660CUA delivers identical performance in a 43% smaller package - making both viable alternatives depending on layout and EMI priorities.
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 with RoHS-compliant packaging and commercial-temperature reliability.
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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The ICL7660CSA+ belongs to Maxim's legacy switched-capacitor voltage converter product line, designed specifically for compact, inductor-free generation of negative or doubled supply rails in low-power portable and embedded systems.
FAQ
What is the maximum output current of the ICL7660CSA+ and under what conditions is it specified?
The ICL7660CSA+ delivers up to 10mA output current with a maximum 0.5V output drop when supplied from +5V input at room temperature. This rating assumes standard operating conditions: no external diode, 10μF pump and reservoir capacitors, and nominal oscillator frequency (~10kHz). Performance degrades at lower input voltages or elevated temperatures due to increased output resistance.
Can the ICL7660CSA+ be used to generate +10V from a +5V supply?
Yes, the ICL7660CSA+ supports voltage doubling in addition to inversion. When configured as a voltage doubler (per Figure 9 in the datasheet), it produces approximately 2×V+ minus diode drops - yielding ~9.4V with Schottky diodes from a +5V input. Note that output current capability drops to ~5mA in doubler mode due to higher effective output resistance.
Is the BOOST pin on the ICL7660CSA+ functional, and how does it differ from the MAX1044?
No, the BOOST pin is not functional on the ICL7660CSA+. Pin 1 is designated N.C. (No Connection) and must remain unconnected. This differs from the MAX1044, where pin 1 is an active BOOST input that raises oscillator frequency by ~6×. The ICL7660CSA+ relies solely on its internal oscillator or external clock on pin 7 for frequency control.
What is the correct connection for the LV pin on the ICL7660CSA+ when operating from a +3.3V supply?
When operating the ICL7660CSA+ from +3.3V, the LV pin (pin 6) must be connected to GND to enable proper low-voltage operation and ensure reliable startup. Leaving LV open at V+ < 3.5V risks oscillator stall or erratic output. This connection bypasses the internal regulator and improves performance below 3.5V, as explicitly required in the datasheet.
Does the ICL7660CSA+ require external diodes for safe operation across its full temperature range?
No, the ICL7660CSA+ does not require external diodes for safe operation across its full 0°C to +70°C temperature range. Its on-chip MOSFET switches eliminate forward-voltage drop and reverse-recovery issues inherent in discrete diodes. External diodes are only recommended when replacing older Intersil ICL7660 variants that lack integrated switching capability.
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:
- 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-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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