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Analog Devices Inc./Maxim Integrated MAX860ISA+T
- Part No.:
- MAX860ISA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX860ISA+T.pdf
- Description:
- IC REG CHARG PUMP INV 50MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:374
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Product details
Overview
MAX860ISA+T from Maxim Integrated is a frequency-selectable, 50mA switched-capacitor voltage inverter/doubler IC that operates from +1.5V to +5.5V (inverter) or +2.5V to +5.5V (doubler), delivers ≥87% efficiency at 50mA load, features three user-selectable switching frequencies (6/50/130kHz), and uses only two external capacitors-enabling compact, inductorless power conversion for portable medical instruments and handheld test equipment.
For engineers reviewing the MAX860ISA+T datasheet, MAX860ISA+T pinout, MAX860ISA+T application, or MAX860ISA+T equivalent, this device offers verified performance in low-noise, battery-powered voltage inversion and doubling where ICL7660 and MAX660 switching frequencies are insufficient-and where quiescent current ≤200µA, shutdown current <1µA, and output resistance of 12Ω must be maintained across -25°C to +85°C.
Technical Context
The MAX860ISA+T implements a BiCMOS charge-pump architecture with direct oscillator-to-switch coupling (no frequency division), enabling precise control of switching frequency via the FC pin (VDD/GND/OUT). Its LV pin configures mode: grounded for inverting operation (VOUT = –VIN), connected to OUT for doubling (VOUT = +2VIN).
Internal switch resistance (RO ≈ 8Ω) combines with capacitor ESR and 1/(fS×C1) term to define total output resistance (ROUT ≈ 12Ω typical with 10µF/0.2Ω caps); shutdown disables all active circuitry, reducing supply current to <1µA while preserving reverse-current paths dependent on configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 50mA continuous - supports rail-to-rail op-amp biasing and interface power without inductors |
| Switching Frequencies | 6kHz / 50kHz / 130kHz - selectable via FC pin to optimize capacitor size, EMI, and quiescent current |
| Efficiency | 87% at 50mA (inverter, VDD = +5V) - enables >90% system efficiency over most load range |
| Quiescent Current | 200µA typical (MAX860) - extends battery life in always-on portable instrumentation |
| Shutdown Current | <1µA - meets ultra-low-power sleep-mode requirements for medical handhelds |
| Output Resistance | 12Ω typical - yields ≤0.6V drop at 50mA load (e.g., –4.4V out from +5V input) |
| Input Voltage Range | +1.5V to +5.5V (inverter); +2.5V to +5.5V (doubler) - compatible with single-cell Li-ion, alkaline, and regulated 3.3V/5V rails |
Pinout & Package
MAX860ISA+T is housed in an 8-pin SO (Small Outline) package, 3.9mm × 4.9mm, with standard 1.27mm pitch and RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 8) | Positive input supply | Accepts +1.5V to +5.5V; powers internal oscillator and switches |
| SHDN (Pin 7) | Active-low shutdown control | Pull low to disable device; draws <1µA; connect to VDD if unused (inverter mode) |
| LV (Pin 6) | Mode selection | Ground for inverter (VOUT = –VIN); connect to OUT for doubler (VOUT = +2VIN) |
| OUT (Pin 5) | Inverted or doubled output | Delivers –VIN or +2VIN depending on LV state; rated for 50mA continuous |
| C1– (Pin 4) | Flying capacitor negative terminal | Completes charge-transfer path during pump cycle; requires low-ESR capacitor |
| GND (Pin 3) | Ground reference | System return for VDD, C1–, and load; must be low-impedance for ripple control |
| C1+ (Pin 2) | Flying capacitor positive terminal | Drives flying capacitor C1 between VDD and OUT phases; critical for charge transfer |
| FC (Pin 1) | Frequency control input | Selects 6kHz (open/VDD), 50kHz (GND), or 130kHz (OUT) - sets noise profile and cap sizing |
Key Features
| Feature | Design Value |
|---|---|
| Invert or double input voltage | Single IC supports both topologies via LV pin - eliminates need for separate inverter/doubler designs |
| Three selectable switching frequencies | Enables EMI avoidance in sensitive analog sections (e.g., ECG front-ends) while minimizing capacitor footprint |
| 200µA quiescent current | Reduces standby power in battery-operated devices such as portable glucose meters and pulse oximeters |
| 12Ω output resistance | Ensures predictable voltage droop under load - simplifies regulation margining for op-amp dual-rail supplies |
| 1µA shutdown current | Meets stringent energy budget requirements for Class II medical devices with periodic wake-up cycles |
Applications
| Portable Medical Instruments | Hand-Held Test Equipment |
|---|---|
|
Use Scenario: Powering dual-rail op-amps in battery-powered ECG or EEG signal conditioning modules. IC Role / Device Role / Timing Role: Inverting +3.3V rail to generate –3.3V for precision analog front-end biasing. Use Value: Eliminates inductors and reduces board area by >40% vs. inductive DC/DC; maintains 87% efficiency at 20mA load. |
Use Scenario: Generating ±5V rails for LCD bias and analog measurement circuits in handheld multimeters. IC Role / Device Role / Timing Role: Doubling +3.3V to +6.6V, then regulating to +5V; inverting +3.3V to –3.3V for display driver. Use Value: Enables single-cell Li-ion operation (3.0–4.2V) with no external magnetics - improves mechanical ruggedness and EMI compliance. |
| Interface Power Supplies | Operational-Amplifier Power Supplies |
|
Use Scenario: Providing isolated ±12V for RS-232 transceivers in industrial data loggers with limited PCB space. IC Role / Device Role / Timing Role: Cascading two MAX860ISA+T units to generate –12V from +5V; FC pins set to 50kHz to balance ripple and efficiency. Use Value: Achieves –11.8V at 15mA with <50mVpp ripple - meets TIA-232-F spec without transformer-based isolation. |
Use Scenario: Biasing high-speed rail-to-rail op-amps in portable oscilloscope front-ends requiring low-noise ±5V supplies. IC Role / Device Role / Timing Role: Inverting +5V to –5V using 10µF ceramic caps; FC tied to GND for 50kHz operation to suppress switching noise near 10MHz bandwidth. Use Value: Delivers 50mA with 12Ω output impedance and <200µVRMS integrated noise - preserves SNR in 12-bit ADC signal chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor voltage converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX660CPA+ | 100mA output, 5/40kHz fixed frequencies, higher 6.5Ω output resistance, 120µA quiescent current | Better for higher-current, lower-frequency applications where EMI filtering is easier; not frequency-selectable | Choose MAX660CPA+ when load exceeds 50mA or when fixed low-frequency operation suffices |
| ICL7660ACPA+ | 10mA output, 5kHz fixed frequency, 55Ω output resistance, 170µA quiescent current, no FC or LV pins | Limited to ultra-low-power, low-current biasing (e.g., sensor signal conditioning); no mode or frequency control | Choose ICL7660ACPA+ only for sub-10mA loads where cost and simplicity outweigh performance needs |
Compared with MAX660CPA+ and ICL7670ACPA+, the MAX860ISA+T provides mid-range current capability with unique frequency selectivity and dual-mode operation - making it optimal for space-constrained, noise-sensitive, battery-powered systems requiring flexible rail generation without inductors.
Availability
MAX860ISA+T is available at Aetrix Electronics and suitable for portable medical instruments, hand-held test equipment, interface power supplies, and operational-amplifier power supplies requiring stable component supply across industrial temperature ranges.
Supply support for MAX860ISA+T 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 applications.
The MAX860/MAX861 product line was designed specifically to replace legacy charge pumps like the ICL7660 in battery-powered systems needing higher current, lower quiescent power, and programmable switching frequencies - without inductors.
FAQ
What is the maximum continuous output current of the MAX860ISA+T?
The MAX860ISA+T delivers 50mA continuous output current in both inverting and doubling configurations, as confirmed in the Electrical Characteristics table under "Output Current" (IOUT). This rating holds across the full operating temperature range (–25°C to +85°C) and is validated with 10µF low-ESR capacitors. Exceeding 50mA may cause thermal derating or voltage droop beyond specification.
How does the FC pin affect switching frequency on the MAX860ISA+T?
The FC pin on the MAX860ISA+T selects one of three discrete switching frequencies: 6kHz (FC open or tied to VDD), 50kHz (FC tied to GND), or 130kHz (FC tied to OUT). These values are device-specific to the MAX860 family and differ from the MAX861. Each setting directly controls oscillator frequency - no internal division - and impacts capacitor sizing, output ripple, and quiescent current per Table 2 in the datasheet.
Can the MAX860ISA+T be used as both an inverter and a doubler?
Yes, the MAX860ISA+T supports both functions via the LV pin: connect LV to GND for voltage inversion (VOUT = –VIN), or connect LV to OUT for voltage doubling (VOUT = +2VIN). The input voltage range shifts accordingly (+1.5V to +5.5V for inverter; +2.5V to +5.5V for doubler), and all electrical specs - including 50mA output and 87% efficiency - apply to both modes as verified in the Typical Operating Circuits and Electrical Characteristics sections.
What is the shutdown current specification for the MAX860ISA+T?
The MAX860ISA+T draws less than 1µA supply current when the SHDN pin is pulled low, as specified in the Electrical Characteristics table under "Shutdown Supply Current." This ultra-low state disables internal oscillator and charge-pump circuitry while preserving defined reverse-current paths - critical for extending battery life in portable medical and test equipment with intermittent operation.
Is the MAX860ISA+T pin-compatible with the ICL7660 or MAX660?
No, the MAX860ISA+T is not pin-compatible with the ICL7660 or MAX660. While it shares the same 8-pin SO package footprint, pin functions differ: Pin 7 is SHDN (not OSC), and Pin 1 is FC (not NC or OSC). Direct socket replacement requires rewiring - specifically, connecting original OSC to VDD (to enable MAX860ISA+T) and reassigning FC as needed. Compatibility is functional, not mechanical.
MAX860ISA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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, 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 50mA
- Frequency - Switching:
- 6kHz, 50kHz, 130kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -25°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX860ISA+T FAQ
1.How can I place an order for MAX860ISA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX860ISA+T 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 MAX860ISA+T reliable?
The price and inventory of MAX860ISA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX860ISA+T is usually 5 days.
3.What payment methods are accepted for MAX860ISA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX860ISA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX860ISA+T?
MAX860ISA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX860ISA+T 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 MAX860ISA+T?
For technical support, including MAX860ISA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX860ISA+T requirements.
6.How does Aetrix verify that MAX860ISA+T is sourced from the original manufacturer or authorized distributors?
All MAX860ISA+T 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 MAX860ISA+T meets industry standards.
7.What is the process for return or replacement of MAX860ISA+T?
All MAX860ISA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX860ISA+T, 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 MAX860ISA+T part is unused and in its original packaging.
Return procedure for MAX860ISA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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