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Analog Devices Inc./Maxim Integrated ICL7660ESA+
- Part No.:
- ICL7660ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7660ESA+.pdf
- Description:
- IC REG CHARGE PUMP 20MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,233
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Product details
Overview
ICL7660ESA+ 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. It is used in EIA/TIA-232E power supplies and handheld instrument biasing.
For engineers reviewing the ICL7660ESA+ datasheet, ICL7660ESA+ pinout, ICL7660ESA+ application, or ICL7660ESA+ equivalent, key selection factors include its unregulated negative output voltage behavior, 50Ω typical output resistance at 5V/10μF, 98% typical power-conversion efficiency, and SO-8 package compatibility with legacy ICL7660 designs.
Technical Context
The ICL7660ESA+ implements a charge-pump topology using four on-chip MOSFET switches and an internal oscillator to invert input voltage without inductors. Its output voltage is unregulated and load-dependent, varying from -5.0V (no load) to -4.5V (10mA load) at V+ = 5V with 10μF capacitors.
Pin 6 (LV) must be left open for V+ > 5V operation per Intersil/Maxim specification; connecting LV to GND enables 1.5V minimum operation but increases quiescent current. Pin 1 is N.C. (no connection), distinguishing it from the MAX1044's BOOST function.
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 5V systems without external regulation |
| Output Current | 10mA max with 0.5V drop at 5V input - sufficient for op-amp biasing and RS-232 interface ICs |
| Power Efficiency | 95–98% typical - minimizes heat generation in space-constrained portable instruments | No-Load Supply Current | ≤200μA at 5V - enables ultra-low-power standby in battery-operated panel meters |
| Oscillator Frequency | ~10kHz typical (no external capacitor) - places switching noise above audio band but below EMI-sensitive frequencies |
| Output Resistance | 55–100Ω typical at 25°C - defines load regulation slope: ~0.5V drop per 10mA output |
| Operating Temperature | -40°C to +85°C - qualified for industrial and automotive under-hood auxiliary circuits |
Pinout & Package
ICL7660ESA+ is housed in an 8-pin SOIC (SO-8) package with standard 1.27mm pitch, RoHS-compliant lead finish, and thermal pad omitted. Pin 1 is N.C.; pin 6 (LV) is functional only for low-voltage operation; pins 2 and 4 connect external charge-pump capacitors.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connection (N.C.) | Must remain unconnected - not bonded internally; floating or tied to GND degrades oscillator stability |
| 2 | CAP+ | Positive terminal of bucket capacitor C1 - connects to V+ during charging phase of charge-pump cycle |
| 3 | GND | Circuit ground reference and substrate connection - must be low-impedance path to minimize EMI coupling |
| 4 | CAP- | Negative terminal of bucket capacitor C1 - connects to VOUT during discharge phase to shift output polarity |
| 5 | VOUT | Negative voltage output - connects to cathode of reservoir capacitor C2; must not exceed GND potential |
| 6 | LV | Low-voltage enable - tie to GND for V+ < 3.5V operation; leave open for V+ > 5V per datasheet requirement |
| 7 | OSC | Oscillator control - external capacitor here reduces frequency; stray capacitance must be minimized |
| 8 | V+ | Positive supply input (1.5–10V) and substrate connection - bypass with 0.1μF ceramic capacitor close to pin |
Key Features
| Feature | Design Value |
|---|---|
| Inverting voltage conversion | Generates regulated-equivalent -V+ output without inductors or external diodes, simplifying PCB layout for dual-rail analog stages |
| No external diode required | Enables reliable operation across -40°C to +85°C without forward-voltage drift or reverse-leakage degradation |
| 1.5V minimum supply | Supports direct connection to single alkaline or NiMH cells, eliminating need for pre-regulation in handheld test gear |
| 98% typical power efficiency | Reduces thermal load in sealed enclosures like portable multimeters where heatsinking is impractical |
| SO-8 package compatibility | Direct drop-in replacement for legacy ICL7660CPA/CSA in existing industrial control PCBs with no footprint change |
Applications
| EIA/TIA-232E Power Supply | Op-Amp Biasing |
|---|---|
Use Scenario: Generating ±12V rails from a single +5V supply for RS-232 line drivers and receivers in embedded serial interfaces. IC Role / Device Role / Timing Role: Inverting charge-pump converter providing stable -5V to -12V output for driver IC biasing. Use Value: Eliminates need for isolated DC/DC converters, reducing BOM cost by $1.20 and board area by 250mm² per port. | Use Scenario: Powering rail-to-rail input/output op-amps in portable data-acquisition front-ends requiring symmetric analog supply. IC Role / Device Role / Timing Role: Negative voltage generator delivering -5V from main system +5V rail to establish bipolar op-amp operating point. Use Value: Enables true AC-coupled signal conditioning with 0V-referenced inputs while maintaining <200μA total quiescent draw. |
| Handheld Instrument Power | Panel Meter Reference |
Use Scenario: Providing negative bias for LCD contrast control and sensor signal conditioning in battery-powered multimeters. IC Role / Device Role / Timing Role: Low-quiescent inverter supplying -3V to -5V for display driver ICs and precision ADC reference buffers. Use Value: Extends AA battery life to >200 hours in continuous-use mode due to ≤200μA no-load current. | Use Scenario: Generating stable negative reference voltage for 4–20mA loop-powered panel meters with isolated analog outputs. IC Role / Device Role / Timing Role: Unregulated inverter producing -5V output referenced to system GND for DAC and amplifier bias networks. Use Value: Maintains <0.5% full-scale error over temperature via matched capacitor ESR and on-chip switch resistance tracking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1044ESA+ | Includes BOOST pin (pin 1) enabling 6× oscillator frequency increase; higher quiescent current when BOOST active | Better suited for audio-noise-sensitive applications requiring >50kHz ripple frequency; not pin-compatible due to BOOST functionality | Select MAX1044ESA+ only if higher switching frequency is required to reduce capacitor size or shift noise out of audio band |
| ICL7660CUA | Same electrical specs but in 8-pin μMAX package (3mm × 3mm); identical pinout except μMAX has exposed thermal pad | Preferred for space-constrained portable designs where SO-8 footprint is too large; thermal performance differs due to package construction | Choose ICL7660CUA when board area is critical and thermal management allows μMAX mounting; verify land pattern matches |
Compared with ICL7660ESA+, MAX1044ESA+ offers higher-frequency operation but requires PCB redesign due to functional pin 1, while ICL7660CUA provides identical performance in a smaller footprint but demands revised thermal layout and soldering profile.
Availability
ICL7660ESA+ is available at Aetrix Electronics and suitable for EIA/TIA-232E power supplies, op-amp biasing circuits, and handheld instrument power management requiring stable component supply across industrial temperature ranges.
Supply support for ICL7660ESA+ 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 and mixed-signal ICs for industrial, medical, and communications applications.
The ICL7660ESA+ belongs to Maxim's legacy switched-capacitor voltage converter product line, engineered specifically for low-noise, inductorless DC voltage inversion in space- and cost-constrained analog subsystems.
FAQ
What is the maximum output current capability of the ICL7660ESA+?
The ICL7660ESA+ delivers up to 10mA of continuous output current with a 0.5V output drop when supplied from 5V. At lower input voltages (e.g., 3.3V), output current decreases proportionally due to increased effective output resistance. The device is not rated for sustained short-circuit conditions beyond brief transients.
Can ICL7660ESA+ operate from a 1.8V supply?
Yes, the ICL7660ESA+ supports operation down to 1.5V, but pin 6 (LV) must be connected to GND to enable low-voltage mode. At 1.8V input, expect approximately -1.6V output under light load, with reduced efficiency and higher output impedance compared to 5V operation.
Is ICL7660ESA+ pin-compatible with the original Intersil ICL7660?
Yes, the ICL7660ESA+ is fully pin-compatible with the original Intersil ICL7660 in SO-8 packaging. All eight pins retain identical functions and electrical characteristics, including the N.C. status of pin 1 and LV pin behavior, ensuring drop-in replacement in legacy designs.
How does the LV pin affect ICL7660ESA+ performance?
The LV pin on ICL7660ESA+ must be left open for V+ > 5V operation per datasheet specification. When tied to GND, it enables 1.5V minimum operation but increases quiescent current by up to 2× and reduces efficiency at higher supply voltages - a trade-off for extended low-voltage functionality.
What external components are required for basic ICL7660ESA+ inverter operation?
A basic ICL7660ESA+ inverter requires two 10μF electrolytic or tantalum capacitors (C1 on CAP+/CAP-, C2 on VOUT/GND) and a 0.1μF ceramic bypass capacitor between V+ and GND. No diodes, inductors, or resistors are needed - the IC integrates all switching elements and oscillator circuitry.
ICL7660ESA+ 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ICL7660ESA+ FAQ
1.How can I place an order for ICL7660ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7660ESA+ 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 ICL7660ESA+ reliable?
The price and inventory of ICL7660ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7660ESA+ is usually 5 days.
3.What payment methods are accepted for ICL7660ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7660ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7660ESA+?
ICL7660ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7660ESA+ 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 ICL7660ESA+?
For technical support, including ICL7660ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7660ESA+ requirements.
6.How does Aetrix verify that ICL7660ESA+ is sourced from the original manufacturer or authorized distributors?
All ICL7660ESA+ 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 ICL7660ESA+ meets industry standards.
7.What is the process for return or replacement of ICL7660ESA+?
All ICL7660ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with ICL7660ESA+, 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 ICL7660ESA+ part is unused and in its original packaging.
Return procedure for ICL7660ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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