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Analog Devices Inc./Maxim Integrated MAX660CSA+
- Part No.:
- MAX660CSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX660CSA+.pdf
- Description:
- IC REG CHRG PUMP INV 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:831
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Product details
Overview
MAX660CSA+ 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% typical efficiency at 100mA load. It replaces inductor-based switching regulators in space-constrained, low-EMI applications such as handheld instrument power rails.
For engineers reviewing the MAX660CSA+ datasheet, MAX660CSA+ pinout, MAX660CSA+ application, or MAX660CSA+ equivalent, key selection considerations include its dual-mode (inverter/doubler) operation, selectable 10kHz/80kHz oscillator frequency via FC pin, 120µA quiescent current, guaranteed <15Ω output resistance with 10µF capacitors, and SO-8 package compatibility with legacy ICL7660 designs.
Technical Context
The MAX660CSA+ implements a two-phase switched-capacitor topology with internal CMOS switches and a programmable oscillator. Its LV pin enables low-voltage optimization below 3V input by bypassing internal regulation, while FC pin selection directly scales oscillator current to shift between 10kHz (low IQ) and 80kHz (smaller capacitor support) modes.
Oscillator frequency may be further adjusted using an external capacitor on OSC or overdriven by an external CMOS clock; in all cases, the CAP+/CAP- node switching frequency equals half the oscillator frequency. Output voltage accuracy depends on load current, capacitor ESR, and pump frequency-output source resistance rises as frequency decreases unless capacitance is increased proportionally.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +1.5V to +5.5V for inverter mode; +2.5V to +5.5V for doubler mode-defines minimum battery or rail voltage support. |
| Output Current | 100mA continuous-supports moderate-power op-amp supplies or interface bias rails without thermal derating in SO-8 package. |
| Oscillator Frequency | 10kHz typ (FC open) or 80kHz typ (FC = V+)-directly determines ripple frequency, capacitor size, and quiescent current trade-off. |
| Quiescent Current | 120µA typ at 5V/10kHz-enables multi-year battery life in low-duty-cycle portable instruments. |
| Output Impedance | 6.5Ω typ, <15Ω guaranteed with C1=C2=10µF-sets worst-case voltage droop: ≤0.65V at 100mA load. |
| Conversion Efficiency | 88% typ at 100mA (IL to GND), >90% over mid-load range-reduces thermal load vs. linear regulators in dual-rail systems. |
| Package | 8-pin SO (Small Outline)-0.150" width, surface-mount compatible with automated assembly and 1.75mm max height. |
Pinout & Package
MAX660CSA+ uses an 8-pin SO package (JEDEC MS-012AA, 150-mil width) with standard SO-8 footprint and 1.27mm pitch. Pin 1 is marked by notch or dot; device orientation follows standard SO top-view convention.
| 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 cap or CMOS clock-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-simplifies ICL7660 drop-in replacement. |
| OUT | Negative or doubled output | Delivers inverted (-VIN) or doubled (+2×VIN) voltage-output impedance dominates load regulation performance. |
| CAP- | Charge-pump capacitor negative terminal | Switches between V+ and OUT phases-requires low-ESR capacitor (≤0.5Ω) to minimize loss and ripple. |
| GND | Power ground reference | Common return for V+, CAP-, and external capacitors-critical for noise control and stability. |
| CAP+ | Charge-pump capacitor positive terminal | Switches between GND and OUT phases-same capacitor (C1) connects between CAP+ and CAP-. |
| FC | Frequency control input | Open = 10kHz oscillator; tied to V+ = 80kHz oscillator-no effect when OSC is externally driven. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode conversion | Configurable as inverter (VOUT = –VIN) or doubler (VOUT = +2×VIN) via LV pin connection-single BOM item supports two power architectures. |
| Selectable oscillator frequency | 10kHz/80kHz via FC pin-enables optimization of capacitor size (10µF vs. 150µF) and quiescent current (120µA vs. ~1mA). |
| Low-output-impedance design | 6.5Ω typical output resistance-limits voltage droop to ≤0.65V at 100mA, enabling stable bias for precision op-amps. |
| ICL7660 pin-compatible upgrade | Same SO-8 pinout and function as ICL7660 but with 2× output current and lower quiescent current-no PCB change required. |
| Robust capacitor flexibility | Supports 1µF–150µF pump/reservoir capacitors with aluminum, tantalum, or OS-CON types-broad sourcing options for cost and size targets. |
Applications
| Laptop Peripheral Power | Medical Sensor Bias Supply |
|---|---|
Use Scenario: Generating isolated ±5V rails for analog front-end op-amps and ADC drivers in portable ultrasound probes. IC Role / Device Role / Timing Role: Voltage inverter providing clean, low-noise negative supply-replaces bulky inductor-based converters to meet strict EMI limits. Use Value: 88% efficiency at 100mA and 120µA quiescent current extend battery runtime while maintaining <100mV ripple with 150µF low-ESR capacitors. |
Use Scenario: Powering low-noise instrumentation amplifiers in handheld ECG monitors operating from single 3.7V Li-ion cells. IC Role / Device Role / Timing Role: Inverter configured with LV = GND to deliver stable –3.3V from 3.3V input-enables rail-to-rail input signal conditioning. Use Value: 6.5Ω output impedance ensures ≤0.33V droop at 50mA sensor bias load, preserving amplifier common-mode range and SNR. |
| Industrial Interface Isolation | Operational Amplifier Dual Supply |
Use Scenario: Providing isolated –5V bias for RS-232 transceivers in factory-floor PLC I/O modules powered from 5V backplane. IC Role / Device Role / Timing Role: Inverter operating at 80kHz (FC = V+) to minimize capacitor size-fits within tight board area constraints near connector. Use Value: 10kHz–80kHz oscillator adjustability allows ripple frequency shifting above sensitive 50/60Hz bands, reducing conducted emissions. |
Use Scenario: Generating ±12V rails for high-slew-rate op-amps in benchtop test equipment powered from 24V DC input. IC Role / Device Role / Timing Role: Doubler (LV = OUT) producing +24V, cascaded with second MAX660CSA+ in inverter mode for –24V-no inductors needed. Use Value: Cascading capability enables scalable dual-rail generation; total output resistance ≈ sum of individual ROUT values (13Ω typ). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-conversion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX860CSA+ | 50mA output current, 12Ω typical output impedance, 6kHz/50kHz/130kHz selectable frequencies-lower current, higher impedance, wider frequency range. | Optimized for ultra-low-power (0.2mA IQ at 6kHz) 50mA loads where size and efficiency at light load matter more than peak current. | Select MAX860CSA+ when load current ≤50mA and lowest possible quiescent current is critical; MAX660CSA+ preferred for 100mA demand. |
| ICL7660CPA | 10mA output current, 55Ω output impedance, fixed 10kHz oscillator-legacy part with significantly lower current capability and higher dropout. | Used in legacy designs where board space allows larger capacitors and load currents are ≤10mA; not suitable as direct replacement for 100mA use cases. | ICL7660CPA is obsolete for new designs requiring >10mA; MAX660CSA+ offers pin-compatible upgrade path with 10× output current and 8.5× lower impedance. |
Compared with MAX860CSA+ and ICL7660CPA, MAX660CSA+ delivers the highest continuous output current (100mA) and lowest output impedance (6.5Ω) in the same SO-8 package, making it optimal for modern portable instrumentation needing robust dual-rail generation without inductors.
Availability
MAX660CSA+ is available at Aetrix Electronics and suitable for laptop peripheral power, medical sensor bias supply, industrial interface isolation, and operational amplifier dual supply applications requiring stable component supply across production lifecycles.
Supply support for MAX660CSA+ 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, medical, and communications systems.
The MAX660CSA+ belongs to Maxim's charge-pump voltage converter product line, designed specifically to replace inductor-based DC-DC converters in space- and EMI-constrained applications while maintaining high efficiency and low quiescent current.
FAQ
What is the maximum continuous output current of the MAX660CSA+?
The MAX660CSA+ delivers 100mA continuous output current in both inverter and doubler modes under specified thermal conditions (TA ≤ +70°C). This rating assumes proper PCB layout with adequate copper pour for heat dissipation and use of low-ESR capacitors. At higher ambient temperatures or with poor thermal design, output current must be derated per the SO package's 5.88mW/°C derating factor above +70°C.
Can the MAX660CSA+ operate from a 3.0V input supply?
Yes, the MAX660CSA+ operates from +1.5V to +5.5V in inverter mode and +2.5V to +5.5V in doubler mode. For 3.0V input, configure LV = GND to enable low-voltage optimization-this bypasses internal regulation and ensures stable operation and best efficiency. Output will be –3.0V (inverter) or +6.0V (doubler) under no-load conditions.
How does the FC pin affect MAX660CSA+ performance?
The FC pin selects oscillator frequency: open circuit yields 10kHz typ (low IQ, larger capacitors), while tying FC to V+ yields 80kHz typ (higher IQ, smaller capacitors). At 80kHz, ripple frequency doubles and capacitor size can be reduced ~8× for equivalent performance-but quiescent current increases to ~1mA. FC has no effect when OSC is driven externally.
Is the MAX660CSA+ pin-compatible with the ICL7660?
Yes, the MAX660CSA+ is explicitly designed as a pin-compatible, high-current upgrade of the ICL7660 in SO-8 and DIP packages. All pins match function-for-function, and LV pin flexibility (open or GND) simplifies drop-in replacement. However, MAX660CSA+ delivers 100mA vs. ICL7660's 10mA and features lower output impedance (6.5Ω vs. 55Ω), requiring no PCB changes but enabling higher load capability.
What capacitor types and values are recommended for MAX660CSA+?
Use low-ESR capacitors: aluminum electrolytic (150µF, ≤0.2Ω ESR), OS-CON polymer, or low-ESR tantalum. For 100mA loads at 5V input, 150µF minimizes ripple (~90mV p-p); 10µF is sufficient for <15mA loads. Avoid high-ESR ceramics alone-C1 and C2 must handle high ripple current. Manufacturer-recommended series include Sanyo MV-GX, AVX TPS, and Nichicon PL.
MAX660CSA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX660CSA+ FAQ
1.How can I place an order for MAX660CSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX660CSA+ 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 MAX660CSA+ reliable?
The price and inventory of MAX660CSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX660CSA+ is usually 5 days.
3.What payment methods are accepted for MAX660CSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX660CSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX660CSA+?
MAX660CSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX660CSA+ 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 MAX660CSA+?
For technical support, including MAX660CSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX660CSA+ requirements.
6.How does Aetrix verify that MAX660CSA+ is sourced from the original manufacturer or authorized distributors?
All MAX660CSA+ 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 MAX660CSA+ meets industry standards.
7.What is the process for return or replacement of MAX660CSA+?
All MAX660CSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX660CSA+, 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 MAX660CSA+ part is unused and in its original packaging.
Return procedure for MAX660CSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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