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Analog Devices Inc./Maxim Integrated MAX660ESA+
- Part No.:
- MAX660ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX660ESA+.pdf
- Description:
- IC REG CHRG PUMP INV 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:472
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Product details
Overview
MAX660ESA+ 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 operates in extended temperature range (-40°C to +85°C) and replaces inductors in battery-powered medical instruments and handheld instrumentation.
For engineers reviewing the MAX660ESA+ datasheet, MAX660ESA+ pinout, MAX660ESA+ application, or MAX660ESA+ equivalent, this page delivers verified electrical parameters, oscillator frequency selection (10kHz/80kHz), low-quiescent-current operation (120µA), and confirmed pin-compatible upgrade path from ICL7660 for voltage inversion and doubling functions.
Technical Context
The MAX660ESA+ implements a two-phase switched-capacitor charge-pump architecture with internal MOSFET switches and a programmable oscillator. Its FC pin selects between 10kHz (typ) and 80kHz (typ) fundamental oscillator frequencies, directly controlling pump rate and enabling optimization of external capacitor size versus quiescent current.
It supports dual operating modes: inverter mode (LV = GND or open) and voltage-doubling mode (LV = OUT), with distinct output impedance behavior and input voltage constraints (+1.5V–5.5V for inverting, +2.5V–5.5V for doubling). Output regulation is passive, relying on fixed charge transfer and low-ESR external capacitors to maintain stability under load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +1.5V to +5.5V (inverter mode); +2.5V to +5.5V (doubler mode) - defines minimum battery voltage support and maximum supply rail compatibility. |
| Output Current | 100mA continuous - enables direct powering of op-amp rails or interface logic without external buffering. |
| Oscillator Frequency | 10kHz typ (FC open) or 80kHz typ (FC = V+) - determines ripple frequency (5kHz or 40kHz), capacitor sizing, and quiescent current trade-off. |
| Conversion Efficiency | 88% typ at 100mA (IL to GND) - reduces thermal load and extends battery life in portable systems. |
| Output Impedance | 6.5Ω typ (ROUT < 15Ω guaranteed with C1=C2=10µF) - sets worst-case voltage droop: ~0.65V at 100mA load. |
| Quiescent Current | 120µA typ - ensures minimal standby power draw in always-on instrumentation and sensor nodes. |
| Absolute Max Supply | +6V (V+ to GND or GND to OUT) - defines safe overvoltage margin during transient conditions. |
Pinout & Package
MAX660ESA+ is housed in an 8-pin SO (Small Outline) package, 150-mil width, with standard JEDEC MS-012AC footprint (5.00mm × 4.00mm × 1.75mm height), RoHS-compliant and Pb-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: CAP+ | Charge-pump capacitor positive terminal | Connects to positive plate of pump capacitor C1; carries bidirectional high-frequency switching current. |
| 2: GND | Power-supply ground reference | Common return for V+, OUT, and internal circuitry; must be low-inductance connection to minimize noise coupling. |
| 3: CAP- | Charge-pump capacitor negative terminal | Connects to negative plate of pump capacitor C1; forms half of charge-transfer path with CAP+. |
| 4: V+ | Positive input supply voltage | Primary power input; supplies all internal circuitry and charge-pump energy; rated up to +6V absolute max. |
| 5: OSC | Oscillator control node | Internal 15pF node; accepts external capacitor for frequency tuning or external CMOS clock (must tie LV = GND if overdriven). |
| 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 in doubler mode. |
| 7: OUT | Negative or doubled output voltage | Delivers inverted (-VIN) or doubled (+2×VIN) output; not actively regulated; output impedance dominates load regulation. |
| 8: FC | Frequency control input | FC = open → 10kHz osc; FC = V+ → 80kHz osc; no effect when OSC is externally driven. |
Key Features
| Feature | Design Value |
|---|---|
| Inverter or doubler mode selection | Configured via LV pin: GND for inverting, OUT for doubling - eliminates need for external mode-switching logic. |
| Selectable oscillator frequency | 10kHz/80kHz via FC pin - enables trade-off between capacitor size (smaller at 80kHz) and quiescent current (lower at 10kHz). |
| Guaranteed low output resistance | ROUT < 15Ω with C1=C2=10µF - ensures predictable voltage droop across production units and temperature range. |
| Pin-compatible ICL7660 upgrade | Same 8-pin SO/DIP footprint and basic functionality - allows drop-in replacement with higher output current and lower quiescent current. |
| Low-noise passive regulation | No inductor required; EMI-free operation - simplifies layout and avoids magnetic coupling issues in sensitive analog circuits. |
Applications
| Laptop Computer Power Rails | Medical Instrumentation Bias Supplies |
|---|---|
Use Scenario: Generating negative bias for LCD contrast control and op-amp dual-rail operation in portable diagnostic devices. IC Role / Device Role / Timing Role: Voltage inverter providing stable -5V from single 5V system rail. Use Value: Eliminates discrete inductor-based DC/DC converters, reducing board area by >40% and eliminating EMI-sensitive magnetics near analog front-ends. |
Use Scenario: Supplying ±5V rails for precision analog signal conditioning in handheld ECG monitors. IC Role / Device Role / Timing Role: Dual-mode converter: inverter for negative rail, doubler for isolated positive rail in isolated sensor interfaces. Use Value: Enables single-battery operation (3.0V lithium) while meeting strict low-noise and low-power requirements (<150µA quiescent). |
| Operational-Amplifier Power Supplies | Interface Power Supplies (RS-232, RS-485) |
Use Scenario: Providing symmetrical ±4.5V supplies for rail-to-rail op-amps in data acquisition modules. IC Role / Device Role / Timing Role: Inverting converter generating -4.5V from +4.5V microcontroller rail. Use Value: Maintains 6.5Ω output impedance to limit voltage shift to ≤0.45V at 70mA load, preserving amplifier common-mode range. |
Use Scenario: Generating -12V and +12V for RS-232 transceivers in industrial field controllers. IC Role / Device Role / Timing Role: Cascaded MAX660ESA+ devices producing -12V (two-stage inverter) and +12V (doubler + booster). Use Value: Achieves required interface voltage levels using only ceramic capacitors and zero inductors, improving reliability in vibration-prone environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-conversion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX860ESA+ | 50mA output current rating; 12Ω typical output impedance; supports same 8-pin SO package and FC/OSC/LV pin functions. | Lower output current limits use in high-load op-amp rails or RS-232 drivers; better suited for ultra-low-power sensor nodes. | Select MAX860ESA+ when load current ≤50mA and lowest possible quiescent current (0.2mA at 6kHz) is prioritized over drive strength. |
| ICL7660CPA+ | Original 100mA inverter but higher 55Ω output impedance; 80µA quiescent current; identical pinout and basic function. | Higher output droop (~5.5V drop at 100mA) limits use in precision analog rails; lacks FC pin for frequency selection. | Choose ICL7660CPA+ only for legacy designs where MAX660ESA+'s improved efficiency and lower impedance are unnecessary. |
Compared with MAX860ESA+ and ICL7660CPA+, the MAX660ESA+ uniquely balances 100mA drive capability, 6.5Ω output impedance, and selectable 10kHz/80kHz operation-making it optimal for new designs requiring robust voltage inversion without inductors.
Availability
MAX660ESA+ is available at Aetrix Electronics and suitable for medical instrumentation, handheld test equipment, and operational-amplifier power supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX660ESA+ 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 applications.
The MAX660ESA+ belongs to Maxim's switched-capacitor voltage converter product line, designed specifically to replace inductor-based DC/DC solutions in space-constrained, low-EMI, and battery-sensitive systems.
FAQ
What is the maximum continuous output current of the MAX660ESA+?
The MAX660ESA+ delivers 100mA continuous output current into the load when configured in inverter mode with proper external capacitors (C1=C2≥10µF, low ESR) and within its specified temperature range (-40°C to +85°C). This rating assumes adequate PCB copper area for thermal dissipation and adherence to absolute maximum ratings, including +6V supply limit and 471mW power dissipation ceiling in the SO package.
Can the MAX660ESA+ be used to generate a +10V output from a +5V input?
Yes, the MAX660ESA+ can double a +5V input to produce approximately +10V in voltage-doubling mode (LV tied to OUT), delivering up to 100mA at ~88% efficiency. However, input voltage must be ≥+2.5V for doubler operation, and output voltage will drop under load due to 6.5Ω typical output impedance - e.g., ~+9.35V at 100mA. External regulation may be needed for precision applications.
How does the FC pin affect oscillator frequency and system performance in the MAX660ESA+?
The FC pin on the MAX660ESA+ selects between two internal oscillator frequencies: 10kHz (FC open) or 80kHz (FC = V+). Higher frequency reduces required capacitor values (e.g., 10µF vs. 150µF) and output ripple frequency (40kHz vs. 5kHz), but increases quiescent current from 120µA to ~1mA. Designers choose based on EMI, capacitor size, and standby power priorities.
Is the MAX660ESA+ pin-compatible with the ICL7660, and what are the key functional improvements?
Yes, the MAX660ESA+ is pin-compatible with the ICL7660 in 8-pin SO and DIP packages. Key improvements include higher output current (100mA vs. 20mA), lower output impedance (6.5Ω vs. 55Ω), selectable oscillator frequency (FC pin), and reduced quiescent current (120µA vs. 80µA). These enhancements enable direct replacement in most ICL7660 designs without layout changes.
What capacitor types and values are recommended for stable operation of the MAX660ESA+?
For stable MAX660ESA+ operation, use low-ESR aluminum electrolytic (e.g., Sanyo MV-GX, Nichicon PL) or OS-CON capacitors: C1 and C2 = 10µF to 150µF, rated ≥10V. ESR must be ≤0.5Ω (preferably ≤0.2Ω) - high ESR degrades output voltage and efficiency. Ceramic capacitors are unsuitable due to insufficient capacitance and voltage derating issues at operating frequencies.
MAX660ESA+ 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX660ESA+ FAQ
1.How can I place an order for MAX660ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX660ESA+ 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 MAX660ESA+ reliable?
The price and inventory of MAX660ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX660ESA+ is usually 5 days.
3.What payment methods are accepted for MAX660ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX660ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX660ESA+?
MAX660ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX660ESA+ 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 MAX660ESA+?
For technical support, including MAX660ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX660ESA+ requirements.
6.How does Aetrix verify that MAX660ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX660ESA+ 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 MAX660ESA+ meets industry standards.
7.What is the process for return or replacement of MAX660ESA+?
All MAX660ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX660ESA+, 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 MAX660ESA+ part is unused and in its original packaging.
Return procedure for MAX660ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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