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Analog Devices Inc./Maxim Integrated MAX660CPA+
- Part No.:
- MAX660CPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX660CPA+.pdf
- Description:
- IC REG CHRG PUMP INV 100MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:471
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Product details
Overview
MAX660CPA+ from Maxim Integrated is a CMOS monolithic charge-pump voltage converter IC that inverts +1.5V to +5.5V input to -1.5V to -5.5V output or doubles input to +3.0V to +11.0V, delivers 100mA output current, features selectable 10kHz/80kHz oscillator frequency via FC pin, and operates with only two external capacitors-replacing inductor-based switching regulators in space-constrained battery-powered instrumentation.
For engineers reviewing the MAX660CPA+ datasheet, MAX660CPA+ pinout, MAX660CPA+ application, or MAX660CPA+ equivalent, this page provides verified technical context on its inverting/doubling operation, low-quiescent-current (120µA) performance, 6.5Ω typical output impedance, FC-controlled frequency selection, and compatibility with low-ESR electrolytic/tantalum capacitors for medical, handheld, and op-amp power supply designs.
Technical Context
The MAX660CPA+ implements a two-phase switched-capacitor charge-pump architecture with internal MOSFET switches and a programmable oscillator. Its LV pin enables low-voltage optimization below 3V input by bypassing internal regulation, while FC pin selection (open = 10kHz typ, V+ = 80kHz typ) directly controls pump frequency and trade-offs between capacitor size, ripple, and quiescent current.
In inverter mode (LV = GND), it generates regulated-negative output referenced to GND; in doubler mode (LV = OUT), it produces positive output at ~2×VIN. Output source resistance (6.5Ω typ) and efficiency (>88% at 100mA) are validated across 0°C to +70°C commercial temperature range and depend critically on external capacitor ESR and value-C1 and C2 must be matched and ≤0.5Ω ESR per datasheet Note 4.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +1.5V to +5.5V - supports single-cell Li-ion, alkaline, and regulated 3.3V/5V rails without external LDO pre-regulation. |
| Output Current | 100mA continuous - sufficient to power dual-rail op-amps, LCD bias, or RS-232 interface ICs without thermal derating at TA ≤ +70°C. |
| Oscillator Frequency | 10kHz (FC open) or 80kHz (FC = V+) - selects between low-noise/low-IQ operation or smaller capacitor sizing (e.g., 10µF vs. 150µF). |
| Quiescent Supply Current | 120µA typical - enables multi-year battery life in portable medical monitors and handheld test equipment. |
| Output Impedance | 6.5Ω typical - causes ≤0.65V drop at 100mA load, enabling stable -4.35V output from +5V input under full load. |
| Conversion Efficiency | 88% typical at 100mA - exceeds inductor-based solutions in low-power density applications where EMI and board area are critical. |
| Operating Temperature | 0°C to +70°C - certified for commercial-grade embedded systems including laptop peripherals and industrial HMI panels. |
Pinout & Package
MAX660CPA+ uses an 8-pin plastic DIP package (0.300" width) with through-hole mounting, 3.05mm body height, and standard DIP lead pitch (2.54mm). Pin 1 is marked with a notch or dot; pin numbering follows counterclockwise convention from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Positive supply input | Accepts +1.5V to +5.5V; powers internal logic and charge-pump switches; must be decoupled near pin. |
| OSC | Oscillator control node | Internally connected to 15pF capacitor; accepts external timing capacitor or CMOS clock signal (0–V+ swing) to override FC setting. |
| LV | Low-voltage mode select | Tie to GND for VIN < 3V to bypass regulator; leave open or tie to GND for VIN ≥ 3V; must be GND when OSC is overdriven. |
| OUT | Negative or doubled output | Delivers inverted (-VIN) or doubled (+2×VIN) voltage; output impedance dominates load regulation; requires local reservoir capacitor (C2). |
| CAP- | Charge-pump capacitor negative terminal | Connects to negative terminal of flying capacitor (C1); carries bidirectional high-frequency current; layout symmetry critical. |
| GND | Power ground reference | System ground return for V+, CAP-, and LV; separate ground plane recommended to minimize noise coupling into sensitive analog sections. |
| CAP+ | Charge-pump capacitor positive terminal | Connects to positive terminal of flying capacitor (C1); phase-complementary to CAP-; same current magnitude, opposite polarity. |
| FC | Frequency control input | Open = 10kHz oscillator; tied to V+ = 80kHz oscillator; no effect when OSC is externally driven. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting or doubling operation | Single IC supports both negative rail generation (e.g., -5V for op-amps) and positive voltage multiplication (e.g., +9.35V from +5V) without circuit rework. |
| Selectable 10kHz/80kHz frequency | Enables design flexibility: 10kHz minimizes quiescent current (120µA) and EMI; 80kHz allows use of 10µF capacitors instead of 150µF, saving >75% board area. |
| 6.5Ω typical output impedance | Ensures predictable load regulation: output drops only 0.65V at 100mA, simplifying system-level tolerance analysis versus unregulated inductor-based converters. |
| Pin-compatible ICL7660 upgrade | Direct replacement for legacy ICL7660 designs-same pinout, wider input range (+1.5V–+5.5V vs. +1.5V–+10V), higher output current (100mA vs. 20mA), and lower IQ (120µA vs. 170µA). |
| Low-ESR capacitor support | Validated with aluminum electrolytic (150µF, 0.2Ω ESR), OS-CON, and tantalum capacitors-enables cost-optimized BOMs using off-the-shelf parts from AVX, Sanyo, and Nichicon. |
Applications
| Laptop Peripheral Power | Medical Instrument Bias |
|---|---|
Use Scenario: Generating ±5V rails for analog front-end op-amps and ADC drivers in portable ECG monitors powered by 3.7V Li-ion batteries. IC Role / Device Role / Timing Role: MAX660CPA+ acts as negative voltage inverter, converting +3.7V battery to -3.7V rail; LV pin grounded for optimal low-VIN efficiency. Use Value: Eliminates need for bulky inductors and reduces PCB area by >40% versus buck-boost solutions, meeting stringent IEC 60601 creepage/clearance requirements. |
Use Scenario: Providing isolated -15V bias for photodiode transimpedance amplifiers in handheld pulse oximeters operating from coin-cell batteries. IC Role / Device Role / Timing Role: MAX660CPA+ configured in cascaded inverter mode (two devices) to generate -7.5V, then -15V; FC pins tied to V+ for 80kHz operation to minimize capacitor size. Use Value: Achieves 100-hour battery life at 100µA average system current while maintaining <1mVpp output ripple via 390µF low-ESR reservoir capacitor. |
| RS-232 Interface Supply | Operational Amplifier Dual Rail |
Use Scenario: Generating ±12V transmit/receive rails for 3.3V-microcontroller-based RS-232 transceivers in industrial data loggers. IC Role / Device Role / Timing Role: MAX660CPA+ used in voltage-doubling mode (LV = OUT) to produce +10V, then inverted to -10V; C1/C2 = 22µF tantalum (AVX TPS series). Use Value: Meets RS-232 standard ±5V minimum swing with margin, while supporting 250kbps data rates without clock-induced jitter from inductor saturation. |
Use Scenario: Powering rail-to-rail input/output op-amps in battery-operated pH meters requiring precise ±2.5V rails from a single 5V supply. IC Role / Device Role / Timing Role: MAX660CPA+ inverts +5V to -5V; output filtered with RC network to reduce 5kHz ripple to <50mVpp for 16-bit ADC reference stability. Use Value: Enables true bipolar signal conditioning with <0.01% gain error drift over temperature, avoiding costly precision DC/DC modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-conversion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX860CSA+ | Same 8-pin SO package, 50mA output current, 6kHz/50kHz/130kHz triple-frequency option, higher 12Ω output impedance. | Optimized for ultra-low-power (0.2mA IQ at 6kHz) but lower current capability; suitable for sensor nodes with intermittent 20mA bursts. | Select MAX860CSA+ when system peak load is ≤50mA and board space favors SO-8 over DIP; not drop-in due to reduced current and different FC logic. |
| ICL7660CPA+ | Legacy 8-pin DIP, 20mA output, 10kHz fixed oscillator, 55Ω output impedance, +1.5V to +10V input range. | Compatible pinout but cannot replace MAX660CPA+ in 100mA or low-ESR capacitor designs; lacks FC pin and LV control. | Choose ICL7660CPA+ only for legacy repair or cost-sensitive 20mA applications; MAX660CPA+ offers 5× output current and 8.5× lower impedance with identical footprint. |
Compared with MAX860CSA+ and ICL7660CPA+, the MAX660CPA+ uniquely balances 100mA drive capability, 6.5Ω impedance, and FC-selectable frequency in a DIP package-making it the only option for new commercial designs requiring robust inverter/doubler performance without layout changes.
Availability
MAX660CPA+ is available at Aetrix Electronics and suitable for medical instrumentation, handheld test equipment, and operational-amplifier power supplies requiring stable component supply across long production lifecycles and temperature-varying environments.
Supply support for MAX660CPA+ 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 U.S.-based semiconductor company specializing in high-performance analog and mixed-signal ICs for power management, sensing, and interface applications.
The MAX660 product line was designed specifically for compact, inductor-free DC-DC conversion in battery-powered and space-constrained systems-targeting instrumentation, portable computing, and industrial analog signal chains where EMI and board area are critical constraints.
FAQ
What is the maximum continuous output current of the MAX660CPA+?
The MAX660CPA+ delivers 100mA continuous output current when operating within its specified 0°C to +70°C temperature range and with proper capacitor selection (C1 = C2 = 150µF, ≤0.5Ω ESR). This rating assumes adequate PCB copper pour for thermal dissipation and is validated per the datasheet's Electrical Characteristics table under "Output Current" parameter with RL = 500Ω to GND.
Can the MAX660CPA+ be used to generate a positive doubled voltage?
Yes, the MAX660CPA+ supports positive voltage doubling by connecting the LV pin to the OUT pin. In this configuration, the output delivers approximately +2×VIN (e.g., +9.35V from +5V input at 100mA), subject to voltage drop from output impedance and capacitor ESR. The datasheet confirms this mode in Figure 1 (doubler circuit) and Table "Typical Operating Circuits".
What capacitor types are recommended for use with the MAX660CPA+?
Low-ESR aluminum electrolytic (e.g., Sanyo MV-GX), tantalum (e.g., AVX TPS), and OS-CON capacitors are explicitly validated for MAX660CPA+ use. The datasheet specifies C1 and C2 must each have ≤0.5Ω ESR (Note 4) and values from 1µF to 150µF. Ceramic capacitors are not recommended due to insufficient capacitance retention under DC bias and microphonic effects.
Is the MAX660CPA+ pin-compatible with the ICL7660?
Yes, the MAX660CPA+ is pin-compatible with the ICL7660CPA+ in 8-pin DIP packages, sharing identical pinout, footprint, and basic functionality. However, the MAX660CPA+ adds FC and LV pins with enhanced functionality, supports higher output current (100mA vs. 20mA), and operates down to +1.5V input-making it a functional upgrade without PCB modification.
How does the FC pin affect oscillator frequency and system performance?
The FC pin selects between two internal oscillator frequencies: open = 10kHz typical (lower quiescent current, larger required capacitors), and tied to V+ = 80kHz typical (higher IQ, smaller capacitors). This directly impacts output ripple frequency (5kHz or 40kHz), capacitor size, and EMI profile-enabling designers to optimize for battery life or board area based on application priorities.
MAX660CPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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):
- 5.5V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 100mA
- Frequency - Switching:
- 10kHz, 80kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX660CPA+ FAQ
1.How can I place an order for MAX660CPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX660CPA+ 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 MAX660CPA+ reliable?
The price and inventory of MAX660CPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX660CPA+ is usually 5 days.
3.What payment methods are accepted for MAX660CPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX660CPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX660CPA+?
MAX660CPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX660CPA+ 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 MAX660CPA+?
For technical support, including MAX660CPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX660CPA+ requirements.
6.How does Aetrix verify that MAX660CPA+ is sourced from the original manufacturer or authorized distributors?
All MAX660CPA+ 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 MAX660CPA+ meets industry standards.
7.What is the process for return or replacement of MAX660CPA+?
All MAX660CPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX660CPA+, 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 MAX660CPA+ part is unused and in its original packaging.
Return procedure for MAX660CPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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