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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:4,473
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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, delivering up to 100mA with 6.5Ω typical output impedance and 88% efficiency at 100mA load. It replaces inductor-based switching regulators in space-constrained battery-powered systems such as handheld medical instruments and op-amp dual-rail supplies.
For engineers reviewing the MAX660CPA datasheet, MAX660CPA pinout, MAX660CPA application, or MAX660CPA equivalent, key selection considerations include its selectable 10kHz/80kHz oscillator frequency, low 120µA quiescent current, ±0.65V output voltage drop at 100mA, compatibility with low-ESR electrolytic/tantalum capacitors, and pin-for-pin upgrade path from ICL7660 in 8-pin DIP packaging.
Technical Context
The MAX660CPA implements a two-phase switched-capacitor topology with internal CMOS switches and a programmable oscillator. Its FC pin selects between 10kHz (low IQ) and 80kHz (smaller capacitor support) base frequencies, while the OSC pin accepts external clocking or capacitor-based frequency tuning. The LV pin enables low-voltage optimization below 3V input by bypassing internal regulation.
It operates in two distinct modes: inverter mode (LV = GND or open) for negative rail generation, and doubler mode (LV = OUT) for positive voltage multiplication. Output impedance is dominated by internal switch resistance (5.25Ω) plus capacitor ESR contributions, with guaranteed ROUT < 15Ω when C1 = C2 = 10µF.
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 for powering dual op-amps, RS-232 transceivers, or LCD bias supplies from compact PCB layouts. |
| Oscillator Frequency | 10kHz typ (FC open) or 80kHz typ (FC = V+) - trade-off between quiescent current (120µA vs 1mA) and minimum capacitor size (150µF vs 10µF). |
| Output Impedance | 6.5Ω typ - causes ≤0.65V drop at 100mA load, enabling stable -4.35V output from +5V input under full load. |
| Conversion Efficiency | 88% typ at 100mA - exceeds inductor-based converters in sub-100mA range while eliminating EMI and magnetics cost. |
| Quiescent Current | 120µA typ - extends battery life in always-on portable instrumentation and sensor nodes. |
| Package | 8-pin plastic DIP (0.300") - through-hole compatible with legacy designs and manual prototyping; 0°C to +70°C commercial temp range. |
Pinout & Package
MAX660CPA uses an 8-pin plastic DIP package (0.300" width) with standard through-hole mounting. Pin spacing is 0.100", body width 0.300", and total length 0.390". Thermal derating is 9.09mW/°C above +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Positive supply input | Accepts +1.5V to +5.5V; must not exceed +6V absolute max; powers internal logic and charge pump. |
| OSC | Oscillator control node | Internally connected to 15pF capacitor; accepts external timing cap or CMOS clock signal (0–V+ swing); frequency sets pump rate. |
| LV | Low-voltage mode select | Tie to GND for VIN < 3V to bypass regulator; leave open or grounded for VIN ≥ 3V; must be GND when OSC overdriven. |
| OUT | Negative or doubled output | Delivers inverted (-VIN) or doubled (+2×VIN) voltage; short-circuit safe to GND for 1 second only; avoid short to V+. |
| CAP- | Charge-pump capacitor negative terminal | Connects to negative terminal of flying capacitor C1; forms half of charge-transfer path during inversion/doubling cycle. |
| GND | Power ground reference | System ground return for V+, CAP+, and load; separate ground plane recommended to minimize noise coupling. |
| CAP+ | Charge-pump capacitor positive terminal | Connects to positive terminal of flying capacitor C1; alternates polarity with CAP- to transfer charge to reservoir C2. |
| FC | Frequency control input | Open = 10kHz oscillator; tied to V+ = 80kHz oscillator; no effect when OSC driven externally. |
Key Features
| Feature | Design Value |
|---|---|
| Invert or double supply voltage | Single IC supports both negative rail generation (e.g., -5V for op-amps) and positive doubling (e.g., +9.35V from +5V) without component changes. |
| Selectable 10kHz/80kHz operation | FC pin enables optimization: 10kHz minimizes IQ for battery longevity; 80kHz reduces required capacitor size by 15× while increasing IQ to ~1mA. |
| 6.5Ω typical output impedance | Enables predictable voltage drop under load (e.g., -4.35V @ 100mA from +5V), simplifying system-level rail budgeting without feedback regulation. |
| Pin-compatible ICL7660 upgrade | Direct replacement in existing 8-pin DIP/SO footprints with higher output current (100mA vs 20mA), lower dropout, and improved efficiency. |
| Low 120µA operating current | Extends runtime in coin-cell or primary battery applications where standby power dominates lifetime (e.g., handheld multimeters). |
Applications
| Laptop Peripheral Power | Medical Sensor Bias Supply |
|---|---|
Use Scenario: Generating isolated -5V rail for analog front-end ADC drivers and precision op-amps in portable ECG monitors. IC Role / Device Role / Timing Role: Charge-pump voltage inverter providing clean, low-noise negative supply independent of main system rail. Use Value: Eliminates magnetic components and associated EMI, meeting Class B EMC requirements while reducing board area by >40% versus inductive solution. |
Use Scenario: Powering low-noise instrumentation amplifiers and photodiode transimpedance stages in handheld pulse oximeters. IC Role / Device Role / Timing Role: Dual-rail supply generator delivering ±4.5V from single 3.3V Li-ion cell using inverter + LDO post-regulation. Use Value: 120µA quiescent current extends battery life to >100 hours; 6.5Ω output impedance ensures stable bias under dynamic sensor loading. |
| RS-232 Interface Power | Operational Amplifier Dual Rail |
Use Scenario: Providing ±7V supplies for RS-232 line drivers/receivers in industrial data loggers with isolated UART interfaces. IC Role / Device Role / Timing Role: Voltage inverter generating -7V from +5V system rail; paired with MAX680 or similar for positive boost. Use Value: 100mA output supports multiple driver channels; 88% efficiency minimizes thermal impact in sealed enclosures. |
Use Scenario: Creating symmetrical ±12V rails for high-slew-rate op-amps in portable audio analyzers and test equipment. IC Role / Device Role / Timing Role: Inverter IC generating -12V from +12V supply; used with low-ESR aluminum electrolytics (C1=C2=150µF). Use Value: 0.65V dropout at full load ensures ≥-11.35V output, maintaining amplifier headroom across temperature and aging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-conversion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICL7660CPA | Lower 20mA output current, 55Ω output impedance, 80µA IQ, same 8-pin DIP footprint. | Suitable only for light loads (<10mA); cannot replace MAX660CPA in 100mA applications without voltage droop or thermal issues. | Select ICL7660CPA only for legacy cost-sensitive designs with minimal load; MAX660CPA provides direct upgrade path. |
| MAX860CPA | Same 100mA rating and 6.5Ω impedance, but adds 50kHz/100kHz/150kHz oscillator options and µMAX package option. | Better suited for ultra-compact layouts; identical electrical behavior in DIP form but optimized for higher-frequency, lower-capacitance designs. | Choose MAX860CPA when board space is critical and 50kHz+ operation preferred; MAX660CPA remains optimal for cost-sensitive DIP designs. |
Compared with ICL7660CPA, MAX660CPA delivers 5× higher output current and 8.5× lower output impedance, enabling robust performance in modern portable instrumentation; versus MAX860CPA, it offers identical core specs in a mature, widely available DIP package with broader distributor stock.
Availability
MAX660CPA is available at Aetrix Electronics and suitable for laptop peripheral power, medical sensor bias supply, RS-232 interface power, and operational amplifier dual-rail applications requiring stable component supply across long production lifecycles.
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, mixed-signal, and power-management ICs for industrial, medical, and communications markets.
The MAX660CPA belongs to Maxim's switched-capacitor voltage converter product line, designed specifically to eliminate inductors in low-to-medium power DC-DC conversion for portable and space-constrained systems.
FAQ
What is the maximum input voltage the MAX660CPA can handle?
The MAX660CPA has an absolute maximum supply voltage rating of +6V applied between V+ and GND or between GND and OUT. Operation above +5.5V input is not recommended, as output regulation degrades and efficiency drops significantly beyond this point. For reliable long-term use, keep input within the specified +1.5V to +5.5V range per the MAX660CPA datasheet.
Can the MAX660CPA be used to generate a positive doubled output?
Yes, the MAX660CPA supports positive voltage doubling by connecting the LV pin to the OUT pin. In this configuration, it delivers approximately +2×VIN (e.g., +9.35V from +5V input) at up to 100mA. Input voltage must be between +2.5V and +5.5V for doubling mode, and OSC must not be overdriven - LV must remain tied to OUT throughout operation.
What capacitor values are recommended for stable MAX660CPA operation at 100mA?
For stable 100mA operation in inverter mode, use C1 = C2 = 150µF aluminum electrolytic capacitors with ≤0.2Ω ESR. Lower capacitance (e.g., 10µF) is acceptable only at 80kHz oscillator frequency (FC = V+), but requires low-ESR tantalum or OS-CON types. Ceramic capacitors are unsuitable due to insufficient capacitance and microphonic effects.
Is the MAX660CPA pin-compatible with the ICL7660 series?
Yes, the MAX660CPA is explicitly designed as a pin-compatible, high-current upgrade of the ICL7660. It shares identical 8-pin DIP and SO footprints, pin functions, and basic control logic (FC, LV, OSC). No PCB layout changes are needed when replacing ICL7660CPA with MAX660CPA, though capacitor selection may be updated to leverage the higher current capability.
How does the FC pin affect MAX660CPA efficiency and output ripple?
When FC = open, the MAX660CPA operates at 10kHz, yielding 120µA IQ and ~90mVpp output ripple with C2 = 150µF. When FC = V+, oscillator frequency rises to 80kHz, increasing IQ to ~1mA but reducing ripple to ~45mVpp (with same C2) and allowing smaller capacitors. Efficiency remains ≥88% across both modes at 100mA load.
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:
- Obsolete
- 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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