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Analog Devices Inc./Maxim Integrated ICL7660CUA+T
- Part No.:
- ICL7660CUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ICL7660CUA+T.pdf
- Description:
- IC REG CHARGE PUMP 20MA 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
ICL7660CUA+T from Maxim Integrated is a monolithic CMOS switched-capacitor voltage converter that inverts +5V to -5V for analog circuit power supplies, delivering up to 10mA with ≤0.5V output drop at 5V input, operating from 1.5V to 10V supply, and achieving 98% typical power-conversion efficiency.
For engineers reviewing the ICL7660CUA+T datasheet, ICL7660CUA+T pinout, ICL7660CUA+T application, or ICL7660CUA+T equivalent, key selection criteria include its 8-pin μMAX package, no-external-diode operation over full temperature range, LV pin control for low-voltage startup, oscillator frequency tunability via OSC pin, and compatibility with legacy ICL7660 designs requiring compact negative rail generation.
Technical Context
The ICL7660CUA+T implements a charge-pump topology using four on-chip power MOSFET switches and an internal oscillator to synthesize negative output voltage without inductors. Its operation relies on cyclic charge transfer between external bucket (C1) and reservoir (C2) capacitors, with output impedance governed by fOSC and C1 per REQ ≈ 1/(fOSC/2 × C1).
Unlike the MAX1044, the ICL7660CUA+T has no BOOST pin - pin 1 is N.C. - and uses a fixed internal oscillator with typical frequency of 10kHz at V+ = 5V. The LV pin must be left open for V+ > 5V and grounded only if V+ < 3.5V to enable low-voltage regulation mode.
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/9V systems without external regulators. |
| No-Load Supply Current | ≤175 µA at +25°C - enables ultra-low-power standby in portable instrumentation. |
| Output Current Capability | 10 mA at ≤0.5 V output drop - sufficient for op-amp biasing, RS-232 transceivers, and sensor signal conditioning. |
| Oscillator Frequency | Typical 10 kHz (no external capacitor) - places switching noise above audio band while minimizing capacitor size vs. lower-frequency alternatives. |
| Power Conversion Efficiency | 95–98% at RL = 5kΩ - reduces thermal load and extends battery life in handheld devices. |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade embedded systems and consumer electronics. |
| Package | 8-pin μMAX (3mm × 3mm, 0.8mm height) - provides space-constrained PCB layout with thermal pad for improved heat dissipation. |
Pinout & Package
ICL7660CUA+T is housed in an 8-pin μMAX package with exposed thermal pad (pin 3 is GND, pin 8 is V+, and pin 1 is N.C.). The package supports reflow soldering and offers 2.5× smaller footprint than SO-8.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N.C. | No connection - must be left floating; not bonded internally and electrically isolated. |
| 2 | CAP+ | Positive terminal of external bucket capacitor (C1); connects to V+ during charge phase. |
| 3 | GND | Ground reference and substrate connection; also serves as positive terminal of reservoir capacitor (C2) in inverter configuration. |
| 4 | CAP- | Negative terminal of external bucket capacitor (C1); connects to VOUT during discharge phase. |
| 5 | VOUT | Negative output terminal; delivers inverted voltage (e.g., -5V from +5V); connects to negative terminal of C2. |
| 6 | LV | Low-voltage regulator enable - tie to GND only when V+ < 3.5V to extend operation down to 1.5V; leave open otherwise. |
| 7 | OSC | Oscillator control input - connect external capacitor (e.g., 100pF) to reduce frequency; minimize trace length to avoid stray capacitance. |
| 8 | V+ | Positive supply input (1.5V–10V); also substrate connection - requires local 0.1µF bypass capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting voltage conversion | Generates regulated-negative rail (e.g., -5V) from single positive supply without inductors or external diodes. |
| No external diode required | Enables full-temperature-range operation (0°C to +70°C) without series Schottky diode, reducing BOM count and forward-drop loss. |
| LV pin for low-voltage startup | Allows reliable startup at 1.5V input when LV is grounded - critical for single-cell battery-powered handheld instruments. |
| OSC pin frequency tuning | Supports oscillator frequency reduction (e.g., from 10kHz to 400Hz) via external capacitor, lowering quiescent current to ~15µA at light loads. |
| μMAX package footprint | 3mm × 3mm body with thermal pad enables high-density layouts in space-constrained applications like panel meters and portable telephones. |
Applications
| EIA/TIA-232E Power Supply | Op-Amp Dual-Rail Biasing |
|---|---|
Use Scenario: Generating ±5V rails for RS-232 line drivers/receivers in industrial serial interfaces where only a +5V supply is available. IC Role / Device Role / Timing Role: Inverting converter providing clean -5V output to complement +5V logic supply for transceiver ICs such as MAX232. Use Value: Eliminates need for dual-output DC/DC or transformer-based solutions - reduces cost, board area, and EMI in compact serial interface modules. | Use Scenario: Powering precision op-amps (e.g., OP27, AD822) in data-acquisition front-ends requiring symmetric ±5V rails from a single +5V source. IC Role / Device Role / Timing Role: Low-noise negative rail generator delivering stable -5V with ≤50mV ripple at 5mA load, supporting high PSRR analog signal paths. Use Value: Enables true bipolar operation of rail-to-rail input/output amplifiers without compromising offset voltage or CMRR due to supply asymmetry. |
| Handheld Instrument Power | Panel Meter Reference Supply |
Use Scenario: Providing isolated -5V bias for LCD contrast control and sensor excitation circuits in battery-operated multimeters and oscilloscope probes. IC Role / Device Role / Timing Role: Ultra-low-quiescent-current inverter (≤175µA no-load) enabling multi-week battery life in Class II portable test equipment. Use Value: Maintains accuracy under varying battery voltage (2.5V–4.2V) via LV pin control and preserves dynamic range through low output impedance (<100Ω at 5kHz). | Use Scenario: Generating stable negative reference for 3½-digit ADCs and LED driver bias in industrial panel meters powered from 24VDC or 5V USB. IC Role / Device Role / Timing Role: Fixed-frequency (10kHz) inverter with minimal output drift (<±20mV over 0–70°C) used to bias precision voltage references (e.g., REF02). Use Value: Ensures consistent ADC zero-scale calibration and eliminates reference error caused by supply-dependent ripple in low-cost meter designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICL7660CSA+T | Same electrical specs but in SO-8 package (4.9mm × 6.0mm), no thermal pad, higher thermal resistance (5.88mW/°C derating). | Preferred for through-hole prototyping or legacy SO-8 footprints; less suitable for high-density or thermally constrained layouts. | Select ICL7660CSA+T only when board real estate allows larger package or thermal management is handled externally. |
| MAX1044CSA+T | Includes BOOST pin (pin 1) enabling 6× oscillator frequency increase; higher quiescent current (200µA max); identical pinout except BOOST replaces N.C. | Better suited for audio-sensitive applications requiring >40kHz ripple frequency or reduced capacitor size; not drop-in compatible due to BOOST functionality. | Choose MAX1044CSA+T when lower output impedance (<25Ω) or EMI suppression is prioritized over lowest quiescent current. |
Compared with ICL7660CUA+T, the ICL7660CSA+T offers identical performance in a larger SO-8 package, while the MAX1044CSA+T adds BOOST-driven frequency scaling at the cost of higher static current - making ICL7660CUA+T optimal for space- and power-constrained commercial instrumentation.
Availability
ICL7660CUA+T is available at Aetrix Electronics and suitable for EIA/TIA-232E power supplies, op-amp dual-rail biasing, and handheld instrument power requiring stable component supply across commercial temperature range and long-term production cycles.
Supply support for ICL7660CUA+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 ICL7660CUA+T belongs to Maxim's legacy switched-capacitor voltage converter product line, designed specifically for compact, inductorless negative rail generation in portable and space-constrained electronic systems.
FAQ
What is the function of pin 1 (BOOST/N.C.) on the ICL7660CUA+T?
Pin 1 on the ICL7660CUA+T is No Connection (N.C.) - it is not bonded and must remain unconnected. Unlike the MAX1044, the ICL7660CUA+T lacks BOOST functionality. Connecting pin 1 to any voltage risks undefined behavior or damage. Always verify pin 1 is floating in schematic and layout for ICL7660CUA+T.
Can the ICL7660CUA+T generate voltages other than inversion (e.g., doubling or division)?
Yes, the ICL7660CUA+T supports multiple configurations: inversion (VOUT = –V+), voltage doubling (VOUT = 2×V+ – 2×VD), and voltage division (VOUT = V+/2) using different external capacitor and diode arrangements. However, only the inverting configuration is optimized for 10mA output; doubling requires Schottky diodes and yields higher dropout due to VD.
What is the recommended capacitor value for C1 and C2 in a standard -5V inverter circuit using ICL7660CUA+T?
For a +5V-to-–5V inverter at 10mA load, use 10µF tantalum or low-ESR ceramic capacitors for both C1 (bucket) and C2 (reservoir). A 0.1µF ceramic bypass capacitor (CBYPASS) between V+ and GND is mandatory. Larger values (e.g., 22µF–47µF) reduce output ripple and impedance but increase start-up time and board area.
Does the ICL7660CUA+T require an external diode for safe operation?
No - the ICL7660CUA+T operates reliably without an external diode across VOUT and GND over its full 0°C to +70°C temperature range and 1.5V–10V supply range. External diodes are unnecessary and may degrade efficiency. Diodes are only needed if replacing older Intersil ICL7660 variants that lacked internal protection.
How does the LV pin affect ICL7660CUA+T performance at 3.3V input?
At 3.3V input, the LV pin must be tied to GND to activate the internal low-voltage regulator, enabling stable oscillator operation and full 10mA output capability. Leaving LV open at V+ = 3.3V causes erratic startup or failure to oscillate. At V+ ≥ 5V, LV must remain open to prevent excessive quiescent current and efficiency loss.
ICL7660CUA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-uMAX/uSOP
ICL7660CUA+T FAQ
1.How can I place an order for ICL7660CUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7660CUA+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 ICL7660CUA+T reliable?
The price and inventory of ICL7660CUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7660CUA+T is usually 5 days.
3.What payment methods are accepted for ICL7660CUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7660CUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7660CUA+T?
ICL7660CUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7660CUA+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 ICL7660CUA+T?
For technical support, including ICL7660CUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7660CUA+T requirements.
6.How does Aetrix verify that ICL7660CUA+T is sourced from the original manufacturer or authorized distributors?
All ICL7660CUA+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 ICL7660CUA+T meets industry standards.
7.What is the process for return or replacement of ICL7660CUA+T?
All ICL7660CUA+T units undergo pre-shipment inspection (PSI). If there is an issue with ICL7660CUA+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 ICL7660CUA+T part is unused and in its original packaging.
Return procedure for ICL7660CUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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