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Analog Devices Inc./Maxim Integrated MAX860ISA+
- Part No.:
- MAX860ISA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX860ISA+.pdf
- Description:
- IC REG CHARG PUMP INV 50MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:728
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Product details
Overview
MAX860ISA+ from Maxim Integrated is a frequency-selectable switched-capacitor voltage converter that inverts +1.5V to +5.5V inputs or doubles +2.5V to +5.5V inputs, delivering up to 50mA output current with 87% efficiency at full load and 200µA quiescent current. It features three user-selectable switching frequencies (6kHz/50kHz/130kHz), 12Ω output resistance, and active-low shutdown reducing supply current to <1µA - ideal for portable medical instruments requiring compact, inductorless negative rail generation.
For engineers reviewing the MAX860ISA+ datasheet, MAX860ISA+ pinout, MAX860ISA+ application, or MAX860ISA+ equivalent, key selection criteria include its SO-8 package compatibility, LV pin configuration for inverter/doubler mode selection, FC pin frequency mapping, and absence of inductors in BOM-critical battery-powered designs.
Technical Context
The MAX860ISA+ 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 across three discrete states: FC = VDD (6kHz), FC = GND (50kHz), or FC = OUT (130kHz). Its internal switch resistance (RO ≈ 8Ω) combines with external capacitor ESR to define total output resistance (ROUT = RO + 4×ESRC1 + ESRC2 + 1/(fS×C1)).
In inverter mode (LV = GND), it generates –VIN with ±0.6V drop at 50mA; in doubler mode (LV = OUT), it produces +2VIN with identical efficiency and load regulation characteristics except for extended input range (+2.5V to +5.5V). Shutdown disables all active circuitry, eliminating reverse-current paths except between VDD and OUT in inverter mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 50mA maximum - supports moderate-power op-amp rails or interface logic without inductors. |
| Switching Frequencies | 6kHz / 50kHz / 130kHz - selectable via FC pin to optimize capacitor size vs. quiescent current vs. EMI. |
| Efficiency | 87% at 50mA load - enables >90% system efficiency in low-noise portable instrumentation. |
| Quiescent Current | 200µA typical - extends battery life in always-on medical sensors and handheld test equipment. |
| Output Resistance | 12Ω typical (with 10µF/0.2Ω ESR caps) - yields ≤0.6V drop at 50mA, enabling stable -4.4V from +5V input. |
| Shutdown Current | <1µA - meets ultra-low-power sleep requirements in portable computing peripherals. |
| 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+ is housed in an 8-pin SO (Small Outline) package measuring 4.9mm × 6.0mm × 1.75mm, RoHS-compliant, with standard 1.27mm pitch and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FC | Frequency Control Input | Selects switching frequency: VDD = 6kHz, GND = 50kHz, OUT = 130kHz - critical for EMI-sensitive analog front-ends. |
| 2 C1+ | Flying Capacitor Positive Terminal | Connects to positive plate of flying capacitor C1 - forms charge-transfer path during pump cycle. |
| 3 GND | Ground Reference | Primary return path for internal switches and external capacitors - must be low-impedance for ripple control. |
| 4 C1– | Flying Capacitor Negative Terminal | Connects to negative plate of flying capacitor C1 - alternates polarity with C1+ to invert/double voltage. |
| 5 OUT | Negative Output (Inverter) / Doubled Positive Output (Doubler) | Delivers inverted (-VIN) or doubled (+2VIN) voltage - load connected between OUT and GND (inverter) or VDD (doubler). |
| 6 LV | Low-Voltage Operation Input | GND = inverter mode; OUT = doubler mode - configures internal switch matrix for voltage polarity/function. |
| 7 SHDN | Active-Low Shutdown Input | <0.3V = shutdown (<1µA IDD); >1.2V = enabled - requires pull-up to VDD when unused in inverter mode. |
| 8 VDD | Positive Input Supply | +1.5V to +5.5V input - powers internal oscillator, logic, and charge-pump switches; bypass with ≥0.1µF ceramic. |
Key Features
| Feature | Design Value |
|---|---|
| Invert or double input voltage | Single IC replaces dual-rail supplies or discrete charge-pump stages - reduces PCB area by >40% vs. inductor-based solutions. |
| Three selectable switching frequencies | Enables trade-off between capacitor size (smaller at 130kHz) and quiescent current (lower at 6kHz) without changing layout. |
| 200µA quiescent current | Supports >1-year battery life in continuous-monitoring medical devices powered by two AA cells. |
| 12Ω output resistance | Ensures ≤0.6V regulation error at 50mA - sufficient for precision op-amp biasing in portable oscilloscopes. |
| 1µA shutdown current | Meets EN 62368-1 standby power limits for Class I portable electronics with automatic sleep modes. |
Applications
| Portable Medical Sensors | Handheld Test Equipment |
|---|---|
|
Use Scenario: Battery-powered ECG front-end requiring ±5V rails for low-noise instrumentation amplifiers. IC Role / Device Role / Timing Role: Generates clean -5V rail from +5V supply using inverter configuration with LV = GND and FC = GND (50kHz). Use Value: Eliminates bulky inductors and reduces EMI-sensitive analog section footprint by 35% versus buck-boost converters. |
Use Scenario: Digital multimeter needing isolated ±3.3V for ADC reference and display driver. IC Role / Device Role / Timing Role: Configured as voltage doubler (LV = OUT) to generate +6.6V, then regulated down to +3.3V with LDO. Use Value: Achieves 92% system efficiency at 20mA load while maintaining <10mVpp ripple for 16-bit ADC accuracy. |
| Operational-Amplifier Power Supplies | Interface Power Supplies |
|
Use Scenario: Rail-to-rail op-amp in portable audio codec requiring symmetric ±2.5V supplies from single 3.7V Li-ion cell. IC Role / Device Role / Timing Role: Inverter generating -2.5V; companion LDO regulates +2.5V from cell - FC = VDD (6kHz) minimizes quiescent draw. Use Value: Enables true bipolar operation with <0.5% THD+N at 1kHz, extending playback time by 22% over inductor-based alternatives. |
Use Scenario: RS-232 transceiver in industrial handheld terminal requiring ±12V from 5V logic rail. IC Role / Device Role / Timing Role: Cascaded MAX860ISA+ pair (Figure 1) generates -10V rail; FC = OUT (130kHz) minimizes flying cap size. Use Value: Delivers compliant ±12V at 10mA with <50mVpp ripple - meets TIA-232-F spec without transformer or charge-pump IC family change. |
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 |
|---|---|---|---|
| MAX861ISA+ | Higher base frequencies: 13kHz/100kHz/250kHz - increases capacitor stress but improves ripple at same capacitance. | Better suited for high-frequency noise-sensitive applications (e.g., RF front-ends) where 250kHz avoids IF bands. | Choose MAX861ISA+ when lower output ripple is prioritized over quiescent current; not pin-compatible due to different FC frequency mapping. |
| MAX660CPA+ | 100mA output, fixed 5kHz/40kHz frequencies, higher 6.5Ω output resistance - uses older CMOS process. | Supports heavier loads but requires larger capacitors; less efficient below 10mA due to higher quiescent current. | Choose MAX660CPA+ only when >50mA output is mandatory and board space allows larger 100µF capacitors. |
Compared with MAX861ISA+, MAX860ISA+ offers lower quiescent current and reduced EMI risk at 6kHz, while MAX660CPA+ provides higher output current at the cost of larger passive components and lower light-load efficiency.
Availability
MAX860ISA+ is available at Aetrix Electronics and suitable for portable medical instruments, handheld test equipment, operational-amplifier power supplies, and interface power supplies requiring stable component supply with guaranteed long-term sourcing.
Supply support for MAX860ISA+ 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 MAX860/MAX861 product line was designed specifically to replace inductor-based DC-DC converters in space-constrained, low-EMI portable systems requiring inverter or doubler functionality without magnetic components.
FAQ
What is the maximum output current capability of the MAX860ISA+?
The MAX860ISA+ delivers up to 50mA of continuous output current in both inverter and doubler configurations. This rating assumes proper capacitor selection (e.g., 10µF low-ESR aluminum electrolytics), ambient temperature ≤+85°C, and adequate PCB copper area for thermal dissipation. Exceeding 50mA may cause thermal shutdown or output voltage droop beyond specification limits.
How do I configure the MAX860ISA+ for voltage inversion versus doubling?
Configure the MAX860ISA+ for inversion by connecting the LV pin to GND; for doubling, connect LV to the OUT pin. The device automatically detects the LV state and reconfigures its internal charge-pump topology. Do not leave LV floating - incorrect connection will result in undefined output behavior or failure to start.
What are the exact switching frequencies available on the MAX860ISA+ and how are they selected?
The MAX860ISA+ offers three discrete switching frequencies: 6kHz (FC = VDD or open), 50kHz (FC = GND), and 130kHz (FC = OUT). These values are confirmed in Table 1 of the datasheet and validated across the full operating temperature range. Frequency selection directly impacts capacitor sizing, output ripple, and quiescent current - no external components are required to set these values.
Can the MAX860ISA+ be used as a direct replacement for the ICL7660 in existing designs?
The MAX860ISA+ can replace the ICL7660 with one wiring modification: pin 7 (SHDN) must be pulled up to VDD instead of left floating like the ICL7660's OSC pin. All other pins are functionally and physically compatible in SO-8 packages. However, note that MAX860ISA+ frequencies differ significantly (6/50/130kHz vs. ICL7660's fixed 10kHz), potentially affecting EMI filtering requirements.
What is the recommended capacitor configuration for achieving 50mA output with minimal ripple on the MAX860ISA+?
To achieve 50mA output with minimal ripple on the MAX860ISA+, use 10µF/0.2Ω ESR aluminum electrolytic capacitors for both C1 (flying) and C2 (output), with FC = GND for 50kHz operation. This configuration yields 12Ω output resistance and <20mVpp ripple at 50mA. For lower ripple, increase C2 to 22µF or use low-ESR tantalum; for smaller size, reduce C1 to 4.7µF with FC = OUT (130kHz).
MAX860ISA+ 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, 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+ FAQ
1.How can I place an order for MAX860ISA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX860ISA+ 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+ reliable?
The price and inventory of MAX860ISA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX860ISA+ is usually 5 days.
3.What payment methods are accepted for MAX860ISA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX860ISA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX860ISA+?
MAX860ISA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX860ISA+ 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+?
For technical support, including MAX860ISA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX860ISA+ requirements.
6.How does Aetrix verify that MAX860ISA+ is sourced from the original manufacturer or authorized distributors?
All MAX860ISA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX860ISA+?
All MAX860ISA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX860ISA+, 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+ part is unused and in its original packaging.
Return procedure for MAX860ISA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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