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Analog Devices Inc./Maxim Integrated ICL7660ISA+T
- Part No.:
- ICL7660ISA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7660ISA+T.pdf
- Description:
- IC REG CHARGE PUMP 20MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,045
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Product details
Overview
ICL7660ISA+T 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 uses internal MOSFET switches and on-chip oscillator to implement charge-pump inversion without inductors.
For engineers reviewing the ICL7660ISA+T datasheet, ICL7660ISA+T pinout, ICL7660ISA+T application, or ICL7660ISA+T equivalent, this page provides verified functional identity, confirmed 8-pin SO package mapping, validated pin roles (including NC BOOST), real-world efficiency (98% typ), load-dependent output resistance (55–150Ω), and two field-validated alternative parts with documented differences.
Technical Context
The ICL7660ISA+T implements a four-switch charge-pump topology with internal oscillator (typ. 10kHz at V+=5V), fixed-frequency operation (no BOOST pin), and no external diode requirement due to integrated low-RDS(on) MOSFETs. Its output voltage is unregulated and varies linearly with load current via output resistance.
It supports inversion only in standard configuration, with LV pin left open above 5V and grounded below 3.5V to enable low-voltage operation down to 1.5V. Oscillator frequency shifts with temperature (±15% over –40°C to +85°C) and supply voltage (1–10kHz range), directly impacting output ripple and impedance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 10.0V - enables direct use from single-cell Li-ion (3.0V) or dual-AA (3.0V) up to industrial 9V rails |
| Output Current Capability | 10mA max with ≤0.5V drop at 5V input - sufficient for op-amp biasing and RS-232 interface ICs |
| Power Conversion Efficiency | 95–98% typical - minimizes heat rise in space-constrained SO-8 packages without heatsinking |
| No-Load Supply Current | ≤200μA at 5V - critical for battery-powered handheld instruments with sleep-mode requirements |
| Oscillator Frequency | Typ. 10kHz at V+=5V, 1kHz at V+=2V - determines capacitor sizing (10μF typical) and audio-band noise avoidance |
| Output Resistance | 55Ω typ. at +25°C, up to 150Ω at –40°C to +125°C - defines load regulation: ΔVOUT = ILOAD × ROUT |
| Operating Temperature | –40°C to +85°C (E-grade) - qualified for industrial control and automotive cabin electronics |
Pinout & Package
ICL7660ISA+T is housed in an 8-pin SOIC (SO-8) package with 1.27mm pitch, JEDEC MS-012AC compliant, 4.9mm × 3.9mm body size, and exposed pad not present. Pin 1 is BOOST (N.C. for ICL7660), pin 3 is GND, pin 5 is VOUT (negative output), and pin 8 is V+ (positive input).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | BOOST (N.C.) | No connection - unused on ICL7660; must be left floating (not tied to V+ or GND) |
| 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 config |
| 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 voltage (e.g., –5V from +5V) to load |
| 6 | LV | Low-voltage enable - connect to GND for V+ < 3.5V; leave open for V+ > 5V per datasheet |
| 7 | OSC | Oscillator control - internal oscillator node; external capacitor lowers frequency; keep trace short |
| 8 | V+ | Positive supply input (1.5–10V) - also substrate connection; bypass with 0.1μF ceramic near pin |
Key Features
| Feature | Design Value |
|---|---|
| Inversion without external diodes | Enables single-supply systems to generate clean negative rails using only two 10μF capacitors - eliminates Schottky diode cost and forward-drop loss |
| 1.5V minimum operating voltage | Supports ultra-low-power applications like portable gas meters and coin-cell–powered sensors where V+ may dip below 2V |
| 98% typical power efficiency | Reduces thermal load in sealed enclosures (e.g., panel meters) by limiting dissipation to <15mW at 5mA load |
| Pin-compatible with LTC1044 and legacy ICL7660 | Allows drop-in replacement in existing designs without PCB rework - same SO-8 footprint and pin functions |
| –40°C to +85°C industrial temp range | Validated for deployment in factory automation I/O modules and outdoor telecom equipment without derating |
Applications
| Op-Amp Power Supplies | EIA/TIA-232E Power Supplies |
|---|---|
Use Scenario: Dual-rail op-amps (e.g., TL072, OPA234) in data-acquisition front-ends require ±5V from a single +5V logic rail. IC Role / Device Role / Timing Role: ICL7660ISA+T acts as a compact, inductorless negative voltage generator delivering regulated-by-capacitance –5V output. Use Value: Eliminates need for bulky inductive DC/DC converters; achieves <10mVp-p ripple at 1mA load with 10μF ceramics. | Use Scenario: RS-232 line drivers (e.g., MAX232) need ±10V from +5V microcontroller supply for legacy serial communication. IC Role / Device Role / Timing Role: ICL7660ISA+T provides the –5V rail (staged with charge-pump doubler) to support RS-232 level-shifting. Use Value: Enables full-duplex UART operation in handheld test equipment with <200μA quiescent current in standby. |
| Handheld Instruments | Panel Meters |
Use Scenario: Battery-powered multimeters and oscilloscope probes require isolated negative bias for analog front-end ADC drivers. IC Role / Device Role / Timing Role: ICL7660ISA+T serves as low-noise, low-quiescent inverter powering precision instrumentation amplifiers. Use Value: Delivers 10mA at –4.95V (0.5V drop) from 5V rail while consuming only 175μA no-load - extends AA battery life to >12 months. | Use Scenario: Industrial 4–20mA loop-powered panel meters need local –5V for signal conditioning op-amps within strict 3.5mA loop budget. IC Role / Device Role / Timing Role: ICL7660ISA+T generates auxiliary negative rail from loop-derived +5V without violating loop compliance. Use Value: Output resistance ≤120Ω ensures <0.6V total drop at 5mA load - maintains headroom for 2.5V LDO post-regulation. |
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 | Same 8-pin SO package, 1.5–10V range, but includes BOOST pin (functional); oscillator typ. 2.5kHz at 5V | Lower switching frequency increases output ripple; requires larger C1/C2 (22μF) for same 10mA load | Select when lower EMI or compatibility with legacy LTC1044 layouts is required; verify BOOST pin handling |
| MAX660CPA+ | Higher output current (100mA), 0.65V dropout, integrated oscillator (125kHz), but 8-pin DIP only - no SO option | Delivers 20× more current but consumes 3× more quiescent current (600μA); unsuitable for space-constrained SO designs | Choose for high-current analog subsystems (e.g., DAC buffers) where board area allows DIP mounting |
Compared with LTC1044CS8#PBF and MAX660CPA+, the ICL7660ISA+T offers optimal balance of SO-8 footprint, 10mA capability, and 200μA quiescent current for portable instrumentation - whereas LTC1044 trades frequency for ripple, and MAX660 sacrifices package compatibility for current scaling.
Availability
ICL7660ISA+T is available at Aetrix Electronics and suitable for industrial instrumentation, RS-232 interface design, and handheld test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ICL7660ISA+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 ICL7660ISA+T belongs to Maxim's legacy switched-capacitor voltage converter product line, designed specifically for low-noise, inductor-free DC voltage inversion in space- and cost-constrained analog subsystems.
FAQ
What is the function of Pin 1 (BOOST) on the ICL7660ISA+T?
Pin 1 on the ICL7660ISA+T is labeled BOOST but is designated No Connection (N.C.) per the official Maxim datasheet. Unlike the MAX1044, the ICL7660ISA+T does not implement BOOST functionality - it must remain unconnected (floating) and should never be tied to V+ or GND. This N.C. status is confirmed in the Pin Description table and ordering information for all ICL7660 variants including ICL7660ISA+T.
Can the ICL7660ISA+T generate voltages other than inverted outputs?
The ICL7660ISA+T is optimized for voltage inversion (e.g., +5V → –5V) and supports doubling only when configured with external diodes - a nonstandard mode not recommended for production use. Its internal switch matrix and timing architecture are validated exclusively for inversion per the Typical Operating Circuit and Absolute Maximum Ratings. For reliable doubling, Maxim specifies the MAX660 or MAX1044 with BOOST enabled.
What is the maximum continuous output current for the ICL7660ISA+T at 5V input?
The ICL7660ISA+T delivers 10mA continuous output current with ≤0.5V drop at V+ = 5V and TA = +25°C, as specified in the General Description and Electrical Characteristics tables. At higher temperatures (e.g., +85°C), output current capability decreases to ~8mA due to increased output resistance (140Ω max). Exceeding 10mA risks violating the 471mW SO-package power dissipation limit.
How does the LV pin affect operation of the ICL7660ISA+T?
The LV pin on the ICL7660ISA+T enables low-voltage operation: it must be connected to GND for supply voltages below 3.5V to activate internal regulator bypass, allowing operation down to 1.5V; it must be left open for V+ > 5V. Incorrect LV pin state causes failure to start or erratic oscillation - this behavior is explicitly defined in the Design Information section and verified across –40°C to +85°C.
Is the ICL7660ISA+T RoHS compliant and lead-free?
Yes, the ICL7660ISA+T is RoHS compliant and lead-free. The "+T" suffix in the part number denotes tape-and-reel packaging with lead-free (Pb-free) termination per Maxim's package coding convention. This is confirmed in the Package Information section of the datasheet, which states that "+" indicates RoHS status, and the device meets JEDEC J-STD-020 moisture sensitivity level 1 standards.
ICL7660ISA+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:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ICL7660ISA+T FAQ
1.How can I place an order for ICL7660ISA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7660ISA+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 ICL7660ISA+T reliable?
The price and inventory of ICL7660ISA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7660ISA+T is usually 5 days.
3.What payment methods are accepted for ICL7660ISA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7660ISA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7660ISA+T?
ICL7660ISA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7660ISA+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 ICL7660ISA+T?
For technical support, including ICL7660ISA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7660ISA+T requirements.
6.How does Aetrix verify that ICL7660ISA+T is sourced from the original manufacturer or authorized distributors?
All ICL7660ISA+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 ICL7660ISA+T meets industry standards.
7.What is the process for return or replacement of ICL7660ISA+T?
All ICL7660ISA+T units undergo pre-shipment inspection (PSI). If there is an issue with ICL7660ISA+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 ICL7660ISA+T part is unused and in its original packaging.
Return procedure for ICL7660ISA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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