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Analog Devices Inc./Maxim Integrated ICL7660EPA
- Part No.:
- ICL7660EPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ICL7660EPA.pdf
- Description:
- IC REG CHARGE PUMP 20MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,260
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Product details
Overview
ICL7660EPA 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 (-40°C to +85°C). It is widely deployed in op-amp power supplies and EIA/TIA-232E interface circuits.
For engineers reviewing the ICL7660EPA datasheet, ICL7660EPA pinout, ICL7660EPA application, or ICL7660EPA equivalent, this page provides verified functional specifications, validated pin-level circuit roles, confirmed operating envelope limits, and real-world design constraints including LV pin configuration rules, oscillator frequency dependencies, and output impedance behavior under load.
Technical Context
The ICL7660EPA implements a charge-pump topology using four on-chip power MOSFET switches and an internal oscillator to synthesize negative or doubled output voltages without inductors. Its operation relies on alternating charge transfer between two external capacitors (C1 bucket, C2 reservoir), with output voltage unregulated and load-dependent due to inherent output resistance.
Key control interfaces include the LV pin (grounded below 3.5V for low-voltage operation; open above 5V) and OSC pin (accepts external capacitor for frequency reduction or TTL/CMOS clock up to 400kHz). Unlike the MAX1044, the ICL7660EPA has no BOOST pin - oscillator frequency is fixed at ~10kHz typical with COSC = 1pF and V+ = 5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 10.0V - supports direct use from single-cell Li-ion (3.0V) or dual AA (3.0V) through 9V battery and 5V logic rails. |
| Output Current Capability | 10mA at ≤0.5V drop (V+ = 5V) - sufficient for biasing low-power op-amps, RS-232 drivers, and sensor signal conditioning stages. |
| Power Conversion Efficiency | 95–98% typical (RL = 5kΩ, TA = +25°C) - minimizes thermal rise in space-constrained portable instruments. |
| Oscillator Frequency | ~10kHz typical (COSC = 1pF, V+ = 5V) - places switching noise outside audio band but below RF interference thresholds. |
| No-Load Supply Current | ≤250μA over -40°C to +85°C - enables ultra-low quiescent power in battery-backed data-acquisition systems. |
| Output Resistance | 55–150Ω (IL = 20mA, fOSC = 5kHz) - defines worst-case voltage droop: e.g., -4.5V output at 10mA load from 5V input. |
| Operating Temperature | -40°C to +85°C - qualified for industrial and automotive cabin-ambient environments without derating. |
Pinout & Package
ICL7660EPA uses an 8-pin plastic DIP package (0.300" wide) with lead spacing of 0.100". Pin 1 is top-left when notch faces upward; substrate tied to V+ (pin 8).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N.C. | No internal connection - must be left floating; not used for timing, control, or bias. |
| 2 | CAP+ | Positive terminal of charge-pump capacitor C1 - connects directly to C1 anode during charging phase. |
| 3 | GND | Circuit ground reference and reservoir capacitor positive terminal anchor point in inverter topology. |
| 4 | CAP- | Negative terminal of charge-pump capacitor C1 - connects to C1 cathode; forms pumping node with CAP+. |
| 5 | VOUT | Negative output voltage terminal - connects to cathode of reservoir capacitor C2 in standard inverter configuration. |
| 6 | LV | Low-voltage enable - must be grounded for V+ < 3.5V; left open for V+ > 5V; affects oscillator stability and startup. |
| 7 | OSC | Oscillator control - accepts external capacitor (1pF–100pF) to reduce frequency or external clock (≤400kHz) for synchronization. |
| 8 | V+ | Positive supply input (1.5–10V) and substrate connection - requires local 0.1μF bypass capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting voltage conversion | Generates -V+ output from single positive rail without inductors - eliminates EMI and size penalties of buck-boost regulators. |
| No external diode required | On-chip MOSFET switches replace discrete diodes - reduces BOM count, improves reliability, and avoids forward-voltage loss. |
| Wide input voltage range | 1.5V minimum start-up enables use with single alkaline or NiMH cells - extends battery life in handheld meters. |
| High conversion efficiency | 98% typical efficiency at light loads - preserves battery energy in always-on sensor nodes and portable test equipment. |
| Industrial temperature grade | -40°C to +85°C operation - supports deployment in factory automation controllers and outdoor instrumentation enclosures. |
Applications
| Op-Amp Power Supplies | EIA/TIA-232E Power Supplies |
|---|---|
Use Scenario: Providing dual-rail ±5V supply for precision instrumentation amplifiers in portable multimeters. IC Role / Device Role / Timing Role: Inverts +5V logic rail to generate clean -5V analog rail; operates as unregulated charge-pump voltage source synchronized to internal oscillator. Use Value: Eliminates need for separate negative supply IC or transformer-based solution - reduces PCB area by >40% and component count by 3–5 parts. |
Use Scenario: Generating ±12V RS-232 driver voltages from a single 5V USB-powered host controller. IC Role / Device Role / Timing Role: Functions as dual-stage inverter (first stage: -5V, second stage: -10V) to meet EIA/TIA-232E driver compliance thresholds. Use Value: Enables true RS-232 level generation without external DC-DC modules - maintains signal integrity while meeting ±5V min swing requirement. |
| Data-Acquisition Systems | Hand-Held Instruments |
Use Scenario: Biasing 16-bit SAR ADC reference buffers and PGA front-ends in battery-operated environmental sensors. IC Role / Device Role / Timing Role: Supplies low-noise negative rail for analog signal chain; LV pin grounded to ensure stable startup at 3.3V microcontroller supply. Use Value: Delivers <10mVpp ripple at 1mA load - preserves ENOB in 16-bit conversions without additional LDO post-regulation. |
Use Scenario: Powering LCD bias generators and low-noise microphone preamps in handheld oscilloscopes and spectrum analyzers. IC Role / Device Role / Timing Role: Acts as compact, low-EMI negative supply source; OSC pin left open for nominal 10kHz operation to avoid audible whine. Use Value: Reduces system standby current to <250μA - extends single-charge battery life to >12 hours in Class II portable test gear. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1044EPA | Includes BOOST pin (×6 oscillator boost), higher max supply current (80μA vs. 250μA), same pinout except pin 1 = BOOST instead of N.C. | Better suited for audio-noise-sensitive designs requiring >50kHz switching; less optimal for ultra-low-quiescent battery apps. | Select MAX1044EPA only if BOOST-driven high-frequency operation is required; otherwise ICL7660EPA offers lower static power. |
| ICL7660CPA | Same functionality and pinout, but rated for 0°C to +70°C only - no extended temperature qualification. | Limited to commercial-grade applications (e.g., consumer test tools); unsuitable for industrial control cabinets or automotive under-hood use. | Choose ICL7660CPA only for cost-sensitive, non-extended-temp designs where full -40°C startup is unnecessary. |
Compared with MAX1044EPA, ICL7660EPA trades oscillator flexibility for lower quiescent current and simpler layout; compared with ICL7660CPA, it adds guaranteed -40°C operation without changing footprint or circuit design - making it the default choice for ruggedized portable instrumentation.
Availability
ICL7660EPA is available at Aetrix Electronics and suitable for industrial instrumentation, portable test equipment, and RS-232 interface designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ICL7660EPA 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 computing applications.
The ICL7660EPA belongs to Maxim's legacy switched-capacitor voltage converter product line, engineered specifically for low-noise, inductor-free DC voltage inversion in space- and power-constrained analog subsystems.
FAQ
What is the maximum output current specification for the ICL7660EPA?
The ICL7660EPA delivers 10mA output current with a maximum 0.5V output drop when supplied from 5V. This is measured at TA = +25°C with LV pin open and no external oscillator; output current capability decreases at lower input voltages or elevated temperatures due to increased output resistance.
Does the ICL7660EPA require an external diode for operation?
No - the ICL7660EPA integrates four power MOSFET switches and requires no external diodes for basic inverting operation across its full -40°C to +85°C temperature range and 1.5V–10V supply range. External diodes are only needed if replacing older Intersil ICL7660 variants with different internal architecture.
How does the LV pin affect ICL7660EPA performance?
The LV pin must be grounded for supply voltages below 3.5V to enable reliable startup and stable oscillator operation; it must remain open for V+ > 5V. Incorrect LV pin configuration causes erratic oscillation, startup failure, or excessive quiescent current - verified in Electrical Characteristics tables for ICL7660EPA across all temperature grades.
Can the ICL7660EPA generate voltages other than inverted outputs?
Yes - the ICL7660EPA supports voltage doubling, halving, and multiplication via external capacitor reconfiguration per Figures 9–11 in the datasheet. For example, connecting C1 between V+ and CAP+, and C2 between CAP- and VOUT yields +2×V+ output minus diode drops - though Schottky diodes are recommended to minimize loss.
What is the oscillator frequency behavior of the ICL7660EPA?
The ICL7660EPA features a typical oscillator frequency of 10kHz (COSC = 1pF, V+ = 5V), with no BOOST pin. Frequency varies with supply voltage and temperature: ~5kHz at V+ = 2V, and decreases ~15% from -40°C to +85°C. An external capacitor on OSC pin or TTL/CMOS clock (≤400kHz) can override internal timing.
ICL7660EPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- 20mA
- Frequency - Switching:
- 10kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
ICL7660EPA FAQ
1.How can I place an order for ICL7660EPA through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7660EPA 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 ICL7660EPA reliable?
The price and inventory of ICL7660EPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7660EPA is usually 5 days.
3.What payment methods are accepted for ICL7660EPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7660EPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7660EPA?
ICL7660EPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7660EPA 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 ICL7660EPA?
For technical support, including ICL7660EPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7660EPA requirements.
6.How does Aetrix verify that ICL7660EPA is sourced from the original manufacturer or authorized distributors?
All ICL7660EPA 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 ICL7660EPA meets industry standards.
7.What is the process for return or replacement of ICL7660EPA?
All ICL7660EPA units undergo pre-shipment inspection (PSI). If there is an issue with ICL7660EPA, 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 ICL7660EPA part is unused and in its original packaging.
Return procedure for ICL7660EPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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