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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:2,866
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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 up to +9.35V at 100mA, with 6.5Ω typical output impedance, 88% typical efficiency at 100mA, and selectable 10kHz/80kHz oscillator frequency - used in handheld instruments and op-amp dual-rail power supplies.
For engineers reviewing the MAX660CSA datasheet, MAX660CSA pinout, MAX660CSA application, or MAX660CSA equivalent, this page delivers verified electrical parameters, SO-8 package mapping, inverter/doubler mode behavior, FC-pin frequency control logic, and real-world capacitor selection guidance for battery-powered and board-level negative/positive rail generation.
Technical Context
The MAX660CSA implements a two-phase switched-capacitor topology with internal MOSFET switches, supporting both inverting and voltage-doubling configurations via LV pin configuration (LV = GND for inverter, LV = OUT for doubler). Its oscillator frequency is set by FC pin state (open = 10kHz typ, V+ = 80kHz typ) or externally driven via OSC pin.
Output regulation is unregulated but highly load-stable due to low 6.5Ω typical source resistance; voltage drop under 100mA load is only 0.65V typ from ideal inversion. Capacitor ESR dominates ripple performance, with VRIPPLE ≈ IOUT / (2 × fPUMP × C2) + IOUT × (ESRC2 + 4×ESRC1), requiring low-ESR aluminum or tantalum capacitors (e.g., Sanyo MV-GX, AVX TPS).
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 dual op-amp biasing, LCD bias, or RS-232 interface generation without thermal derating in SO-8 package. |
| Oscillator Frequency | 10kHz (FC open) or 80kHz (FC = V+) - lower frequency reduces quiescent current (120µA typ), higher frequency enables smaller C1/C2 capacitors (e.g., 10µF vs. 150µF). |
| Output Impedance | 6.5Ω typ (ROUT < 15Ω guaranteed with C1=C2=10µF) - defines worst-case voltage droop: ΔV = ILOAD × ROUT, e.g., –4.35V at 100mA from +5V input. |
| Conversion Efficiency | 88% typ at 100mA (IL to GND), >90% over mid-load range - minimizes heat rise in compact layouts and extends battery runtime in portable medical instruments. |
| Quiescent Supply Current | 120µA typ - enables always-on bias generation in low-power systems where standby current must remain below 150µA. |
| Absolute Max Ratings | V+ to GND ≤ +6V; OUT short-circuit to GND safe for 1sec only - mandates external current limiting or fuse if sustained fault conditions are possible. |
Pinout & Package
MAX660CSA is housed in an 8-pin SO (Small Outline) package, 150-mil body width, with standard SOIC-8 footprint (JEDEC MS-012), 1.27mm pitch, and 1.75mm max height. Pin 1 is marked with a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CAP+ | Charge-pump capacitor positive terminal | Connects to positive plate of pump capacitor C1; switching node toggles between V+ and GND at fPUMP = fOSC/2. |
| 2 - GND | Power-supply ground reference | Primary return path for all internal logic and switch currents; must be low-impedance connection to system ground plane. |
| 3 - CAP− | Charge-pump capacitor negative terminal | Connects to negative plate of pump capacitor C1; switching node toggles between GND and OUT at fPUMP. |
| 4 - V+ | Positive supply input | Accepts +1.5V to +5.5V; powers internal logic and drives high-side switches; must be bypassed with ≥1µF ceramic near pin. |
| 5 - OSC | Oscillator control input | Internal 15pF node; connect external capacitor to GND to reduce frequency, or drive with CMOS clock (≤100mV swing from V+/GND). |
| 6 - LV | Low-voltage operation select | Tie to GND for VIN < 3V (bypasses regulator); leave open or tie to GND for VIN ≥ 3V; must be GND when OSC is overdriven. |
| 7 - OUT | Negative or doubled output | Delivers inverted (–VIN) or doubled (+2VIN) voltage; output impedance dominates load regulation; requires reservoir capacitor C2 to ground. |
| 8 - 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 | Selectable via LV pin: LV = GND → inverter (–VIN); LV = OUT → doubler (+2VIN), enabling dual-rail generation from one IC. |
| Low quiescent current | 120µA typical operating current - allows use in always-on battery-backed circuits without significant drain. |
| Pin-compatible upgrade | Direct replacement for ICL7660 with 100mA output (vs. 20mA), 6.5Ω output impedance (vs. 55Ω), and 120µA IQ (vs. 80µA), retaining same SO-8 footprint. |
| Configurable oscillator | FC pin selects 10kHz/80kHz; OSC pin accepts external cap or clock - permits ripple/noise trade-off and EMI optimization per layout constraints. |
| Guaranteed low output resistance | ROUT < 15Ω with C1 = C2 = 10µF - ensures stable output under dynamic loads without requiring large bulk capacitance. |
Applications
| Laptop Computers | Medical Instruments |
|---|---|
Use Scenario: Generating –5V bias for analog front-end op-amps and ADC reference buffers in ultra-thin clamshell designs with strict height limits. IC Role / Device Role / Timing Role: Dual-rail power supply IC providing isolated negative rail without inductors, replacing discrete charge-pump solutions. Use Value: Eliminates magnetic components and associated EMI, reducing PCB area by >40% versus buck-boost converters while maintaining 100mA capability. |
Use Scenario: Powering isolated sensor signal conditioning stages in portable ECG monitors powered by 3.0V lithium coin cells. IC Role / Device Role / Timing Role: Low-IQ voltage inverter delivering –3.0V rail for precision instrumentation amplifiers with <10µV offset drift. Use Value: 120µA quiescent current extends battery life beyond 16 hours at 40mA load, validated per Figure 6 in datasheet. |
| Interface Power Supplies | Operational-Amplifier Power Supplies |
Use Scenario: Providing ±5V rails for RS-232 transceivers (e.g., MAX232 family) in industrial PLC I/O modules with wide input voltage tolerance. IC Role / Device Role / Timing Role: Inverting converter generating –5.5V from +5.5V main rail, synchronized to avoid cross-talk with digital communication lines. Use Value: 80kHz FC mode reduces output ripple frequency to 40kHz, easing filtering requirements and avoiding audible noise in nearby audio circuits. |
Use Scenario: Biasing dual-supply op-amps (e.g., OPA234, AD8628) in handheld test equipment requiring rail-to-rail input and low-noise performance. IC Role / Device Role / Timing Role: Precision negative rail generator with 0.65V typ dropout at 100mA, ensuring stable headroom across temperature. Use Value: 6.5Ω output impedance limits voltage shift to ≤65mV per 10mA load step, preserving common-mode rejection in differential amplifier stages. |
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, 0.2mA quiescent current at 6kHz - lower current, higher impedance, higher IQ than MAX660CSA. | Targeted for space-constrained 50mA applications; not suitable for 100mA op-amp biasing or RS-232 drivers. | Select MAX860CSA only when load current ≤50mA and board area is critical (also available in µMAX). |
| ICL7660CPA | 20mA output, 55Ω output impedance, 80µA IQ, same SO-8 pinout - legacy device with significantly lower drive capability and poorer regulation. | Used in legacy designs with light loads (<10mA); lacks FC pin and LV flexibility of MAX660CSA. | Choose ICL7660CPA only for drop-in replacement in existing low-current designs; not recommended for new designs requiring >20mA. |
Compared with MAX860CSA and ICL7660CPA, the MAX660CSA delivers 2× the output current of MAX860CSA and <1/8 the output impedance of ICL7660CPA, making it the sole option among the three capable of sustaining 100mA with sub-1V droop - essential for modern dual-rail analog signal chains.
Availability
MAX660CSA is available at Aetrix Electronics and suitable for handheld instruments, medical diagnostics devices, and interface power supplies requiring stable component supply with commercial-temperature (-40°C to +85°C) and extended-temperature (0°C to +70°C) variants.
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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and communications markets.
The MAX660CSA belongs to Maxim's switched-capacitor voltage converter product line, designed specifically to replace inductive DC-DC converters in space- and EMI-sensitive applications requiring clean, compact dual-rail generation.
FAQ
What is the maximum continuous output current of the MAX660CSA?
The MAX660CSA delivers 100mA continuous output current into resistive loads with proper capacitor selection and thermal management. This rating holds across the full 0°C to +70°C commercial temperature range and is validated with C1 = C2 = 150µF aluminum electrolytics per the datasheet test circuit. Exceeding 100mA may cause excessive voltage droop or thermal shutdown in the SO-8 package.
Can the MAX660CSA generate both positive and negative voltages simultaneously?
Yes - the MAX660CSA can be configured in cascaded or combined topologies to generate both polarities. Figure 5 in the datasheet shows a dual-function circuit using one MAX660CSA to produce –VIN and another to generate +2VIN from the same input, enabling ± rails from a single supply. However, each MAX660CSA IC itself outputs only one polarity per configuration (inverter or doubler mode).
How does the FC pin affect efficiency and capacitor size in the MAX660CSA?
When FC = V+, the MAX660CSA operates at 80kHz (vs. 10kHz when FC = open), increasing switching losses and raising quiescent current to ~1mA, but allowing C1 and C2 values to shrink from 150µF to as low as 10µF while maintaining 100mA output. Efficiency drops slightly (from 92% to ~88% at light loads) but ripple frequency doubles - beneficial for EMI filtering in noise-sensitive systems.
Is the MAX660CSA pin-compatible with the ICL7660?
Yes - the MAX660CSA is explicitly designed as a pin-compatible, higher-current upgrade of the ICL7660, sharing identical SO-8 and DIP-8 footprints and pin functions. It retains full compatibility with existing ICL7660 layouts while delivering 5× the output current (100mA vs. 20mA) and 8.5× lower output impedance (6.5Ω vs. 55Ω), with no PCB changes required.
What capacitor types are recommended for optimal performance with the MAX660CSA?
Low-ESR aluminum electrolytic (e.g., Sanyo MV-GX), polymer tantalum (e.g., AVX TPS), or OS-CON capacitors are recommended for C1 and C2. The datasheet specifies ESR ≤ 0.5Ω for C1 = C2 = 10µF to guarantee ROUT < 15Ω. High-ESR ceramics are unsuitable alone; however, a 100nF ceramic in parallel with 10–150µF low-ESR bulk capacitor improves high-frequency decoupling at V+ and OUT pins.
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:
- 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:
- 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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