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Analog Devices Inc./Maxim Integrated ICL7660CSA+T
- Part No.:
- ICL7660CSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7660CSA+T.pdf
- Description:
- IC REG CHARGE PUMP 20MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,294
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Product details
Overview
ICL7660CSA+T from Maxim Integrated is a monolithic CMOS switched-capacitor voltage converter designed for inverting +5V logic supplies to generate regulated -5V analog rails. It 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 diodes across its full temperature range. It is widely deployed in op-amp power supplies and EIA/TIA-232E interface circuits.
For engineers reviewing the ICL7660CSA+T datasheet, ICL7660CSA+T pinout, ICL7660CSA+T application, or ICL7660CSA+T equivalent, key selection criteria include guaranteed 1.5V–10V operation without external diodes, 8-pin SO package compatibility with legacy ICL7660 footprints, fixed internal oscillator (typ. 10kHz), and absence of BOOST functionality compared to MAX1044 variants.
Technical Context
The ICL7660CSA+T implements a charge-pump topology using four on-chip MOSFET switches and an internal oscillator to invert input voltage without inductors. Its operation relies on sequential charging and discharging of external capacitors C1 and C2, synthesizing an effective output resistance inversely proportional to oscillator frequency and capacitor value.
Unlike the MAX1044, the ICL7660CSA+T lacks a BOOST pin and has no N.C. pin - Pin 1 is unconnected. Its LV pin must be left open for V+ > 5V but may be grounded for low-voltage operation down to 1.5V, enabling compatibility with LTC1044 and legacy Intersil designs while maintaining fixed-frequency operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 10.0V - supports direct use from single-cell Li-ion, 3.3V, or 5V logic rails without pre-regulation. |
| Oscillator Frequency | Typ. 10kHz - fixed internal timing enables predictable ripple (≈80mVp-p @ 10mA, 5V input) and eliminates need for external clocking. |
| Output Current | 10mA - sufficient for biasing dual op-amps, RS-232 transceivers, or low-power ADC/DAC analog sections. |
| Output Voltage Drop | ≤0.5V - ensures -4.5V output from +5V input under full load, meeting ±5V rail symmetry requirements. |
| No-Load Supply Current | ≤200μA - enables battery-powered handheld instruments with multi-week standby life. |
| Power Conversion Efficiency | 95–98% - minimizes thermal rise in sealed enclosures and reduces bypass capacitor heating. |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade embedded systems and industrial control panels. |
Pinout & Package
ICL7660CSA+T is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package with standard 1.27mm pitch, RoHS-compliant lead finish, and JEDEC MS-012AC footprint. The package is surface-mount compatible and thermally rated for 471mW dissipation at +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| N.C. | No Connection | Pin 1 is internally unconnected - must remain floating; no pull-up/down required. |
| CAP+ | Charge-Pump Capacitor Positive Terminal | Connects to positive side of bucket capacitor C1; forms half of charge-transfer path during first oscillator phase. |
| GND | Ground Reference | Substrate and signal reference; reservoir capacitor C2's positive terminal ties here in inverter configuration. |
| CAP- | Charge-Pump Capacitor Negative Terminal | Connects to negative side of bucket capacitor C1; critical for polarity-sensitive charge transfer cycle. |
| VOUT | Negative Output Terminal | Delivers inverted voltage; reservoir capacitor C2's negative terminal connects here to stabilize -V+ output. |
| LV | Low-Voltage Operation Control | Ground for V+ < 3.5V to enable sub-3.5V operation; leave open for V+ > 5V per datasheet specification. |
| OSC | Oscillator Frequency Control | Accepts external capacitor to reduce frequency; stray capacitance must be minimized to avoid unintended frequency shift. |
| V+ | Positive Power Input | Supplies all internal circuitry; also serves as substrate connection - must be decoupled with 0.1μF ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| No external diode required | Enables simplified BOM and layout for -5V generation from +5V, eliminating Schottky diode cost and forward-voltage loss. |
| Invert/double/divide/multiply capability | Supports multiple topologies (e.g., Figure 8 inverter, Figure 9 doubler) using same IC - reduces design reuse effort across power rail variants. |
| 98% typical power-conversion efficiency | Reduces heat generation in space-constrained modules like panel meters and handheld test equipment. |
| 1.5V minimum operating voltage | Allows direct interfacing with low-voltage microcontrollers and battery monitors without intermediate LDOs. |
| Pin-compatible with industry-standard ICL7660 | Permits drop-in replacement in existing designs using Intersil or Maxim legacy parts, preserving PCB layout and qualification. |
Applications
| Op-Amp Power Supplies | EIA/TIA-232E Power Supplies |
|---|---|
Use Scenario: Dual-supply operational amplifiers in portable data-acquisition front-ends require symmetric ±5V rails from a single +5V source. IC Role / Device Role / Timing Role: ICL7660CSA+T acts as a compact, inductorless negative voltage generator - its fixed 10kHz oscillator sets ripple frequency and defines capacitor sizing. Use Value: Eliminates need for bulky inductive DC/DC converters, reducing board area by >60% versus switching regulators while maintaining <100mVp-p output ripple. | Use Scenario: RS-232 line drivers in handheld terminals need ±5V to meet EIA/TIA-232E driver voltage compliance (±5V to ±15V). IC Role / Device Role / Timing Role: ICL7660CSA+T provides isolated -5V rail; its 10mA output current meets worst-case RS-232 short-circuit loading per TIA-232 spec. Use Value: Achieves full RS-232 compliance with only two 10μF ceramic capacitors - no magnetics, no feedback loop tuning, no EMI filtering beyond standard bypassing. |
| Portable Telephones | Panel Meters |
Use Scenario: LCD bias generation and audio codec analog supply in GSM handsets demand low-noise, low-quiescent-current negative voltage. IC Role / Device Role / Timing Role: ICL7660CSA+T functions as a low-power inverter; its 200μA max no-load current extends battery runtime between charges. Use Value: Enables 30+ hour standby time on single AA cell by minimizing idle current - critical for always-on communication devices. | Use Scenario: Digital panel meters with 7-segment LED displays and analog input conditioning require stable ±5V for ADC reference and display driver ICs. IC Role / Device Role / Timing Role: ICL7660CSA+T supplies clean -5V rail; its 0.5V output drop ensures ≥4.5V headroom for LED segment drivers under full load. Use Value: Maintains display brightness and ADC accuracy across 0–70°C ambient without thermal derating or additional regulation stages. |
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) that raises oscillator frequency ~6×; higher quiescent current (≤225μA); same 8-pin SO package. | Better suited for noise-sensitive audio applications due to boosted switching frequency shifting ripple out of audible band. | Select MAX1044CSA+ when lower output impedance (<65Ω) or reduced capacitor size (e.g., 1μF instead of 10μF) is required. |
| ICL7660CUA+ | Identical electrical specs but in 8-pin μMAX package (3mm × 3mm); same pinout; higher thermal resistance (330mW @ +70°C vs. 471mW). | Preferred for ultra-compact portable designs where board area is constrained more than thermal budget. | Select ICL7660CUA+ only when PCB real estate savings outweigh thermal derating needs in sealed enclosures. |
Compared with MAX1044CSA+ and ICL7660CUA+, the ICL7660CSA+T offers optimal balance of thermal performance (471mW SOIC rating), legacy footprint compatibility, and proven reliability in commercial-temperature instrumentation - making it the default choice for cost-sensitive, volume-manufactured embedded systems.
Availability
ICL7660CSA+T is available at Aetrix Electronics and suitable for op-amp power supplies, EIA/TIA-232E interface circuits, and portable telephone designs requiring stable component supply with guaranteed long-term manufacturability.
Supply support for ICL7660CSA+T 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 ICL7660 product line was developed to deliver simple, reliable, inductorless voltage inversion for analog subsystems - targeting cost-sensitive, space-constrained applications where efficiency and ease of use outweigh programmability.
FAQ
What is the maximum output current capability of the ICL7660CSA+T?
The ICL7660CSA+T delivers up to 10mA of continuous output current with a maximum 0.5V output voltage drop when supplied from +5V. This is verified across the full 0°C to +70°C operating temperature range and assumes proper external capacitor selection (e.g., 10μF ceramic for C1 and C2). Exceeding 10mA causes disproportionate output voltage sag due to rising effective output resistance.
Does the ICL7660CSA+T require an external diode for operation?
No, the ICL7660CSA+T does not require an external diode for operation across its full 1.5V to 10V input range and 0°C to +70°C temperature range. Its on-chip MOSFET switches eliminate forward-voltage drop and thermal concerns associated with discrete diodes - a key differentiator from earlier charge-pump implementations. External diodes are only needed if replacing obsolete Intersil ICL7660 versions with different internal architecture.
Can the ICL7660CSA+T be used to generate a +10V output from a +5V input?
Yes, the ICL7660CSA+T supports voltage doubling in addition to inversion. When configured as a voltage doubler (per Figure 9 in the datasheet), it delivers approximately 2×V+ minus diode drops - so +5V input yields ~+9.3V with Schottky diodes. However, output current is reduced versus inverter mode, and efficiency drops slightly due to added conduction losses. For higher current or tighter regulation, the MAX660 is recommended.
What is the function of the LV pin on the ICL7660CSA+T?
The LV (Low-Voltage) pin on the ICL7660CSA+T enables operation down to 1.5V input by bypassing an internal regulator. For supply voltages below 3.5V, connect LV to GND; for voltages above 5V, leave LV open. Incorrect LV connection (e.g., grounding LV at 5.5V) increases quiescent current and reduces efficiency. The ICL7660CSA+T's LV behavior matches the original Intersil ICL7660 specification.
Is the ICL7660CSA+T pin-compatible with the MAX1044 series?
The ICL7660CSA+T is pin-compatible with the MAX1044 in the 8-pin SO package for Pins 2–8, but Pin 1 differs: ICL7660CSA+T has N.C., while MAX1044 uses it as BOOST. Direct substitution is possible only if BOOST functionality is unused and Pin 1 remains unconnected. Layouts designed for MAX1044 with BOOST tied high will not operate correctly with ICL7660CSA+T unless Pin 1 is left floating.
ICL7660CSA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for ICL7660CSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7660CSA+T 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+T reliable?
The price and inventory of ICL7660CSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7660CSA+T is usually 5 days.
3.What payment methods are accepted for ICL7660CSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7660CSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7660CSA+T?
ICL7660CSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7660CSA+T 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+T?
For technical support, including ICL7660CSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7660CSA+T requirements.
6.How does Aetrix verify that ICL7660CSA+T is sourced from the original manufacturer or authorized distributors?
All ICL7660CSA+T 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+T meets industry standards.
7.What is the process for return or replacement of ICL7660CSA+T?
All ICL7660CSA+T units undergo pre-shipment inspection (PSI). If there is an issue with ICL7660CSA+T, 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+T part is unused and in its original packaging.
Return procedure for ICL7660CSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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