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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:2,132
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Product details
Overview
MAX860ISA from Maxim Integrated is a frequency-selectable, 50mA switched-capacitor voltage converter that inverts +1.5V to +5.5V inputs or doubles +2.5V to +5.5V inputs. It operates at selectable switching frequencies (6/50/130 kHz), delivers 87% efficiency at 50mA load, and features 12Ω output resistance and 200µA quiescent current - 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 considerations include its SO-8 package compatibility, three-frequency control via FC pin, shutdown current <1µA, 600mV voltage drop at full load, and suitability as a higher-frequency replacement for ICL7660/MAX660 in space-constrained battery-powered systems.
Technical Context
The MAX860ISA implements a BiCMOS charge-pump architecture with direct oscillator-driven switches (no frequency division), enabling precise voltage inversion or doubling without inductors. Its LV pin selects mode (GND = inverter, OUT = doubler), while FC pin configures one of three discrete switching frequencies - 6kHz (FC = VDD/open), 50kHz (FC = GND), or 130kHz (FC = OUT).
Operation relies on two external flying/output capacitors; output source resistance (RO ≈ 8Ω) combines with capacitor ESR and 1/(fS×C1) term to determine total ROUT. Shutdown disables all active circuitry, reducing supply current to <1µA, and reverse-current paths are defined per configuration (inverter vs. doubler) during shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 50mA max - supports moderate-power op-amp rails or interface supplies without thermal derating in SO-8 package. |
| Switching Frequencies | 6/50/130 kHz - enables trade-offs between capacitor size (smaller at 130kHz), quiescent current (lowest at 6kHz), and noise avoidance. |
| Efficiency | 87% at 50mA - minimizes power loss in battery-critical applications; exceeds ICL7660's typical 70–75%. |
| Quiescent Current | 200µA typical - extends battery life in always-on portable instrumentation. |
| Shutdown Current | <1µA - enables deep-sleep modes in handheld devices with zero-load standby requirements. |
| Output Resistance | 12Ω typical - defines voltage droop: e.g., -5.0V no-load → -4.4V at 50mA (Δ0.6V), critical for precision analog biasing. |
| Input Voltage Range | +1.5V to +5.5V (inverter); +2.5V to +5.5V (doubler) - supports single-cell Li-ion down to 2.5V and dual-cell alkaline up to 5.5V. |
Pinout & Package
MAX860ISA is housed in an 8-pin SO (Small Outline) package, 3.9mm × 4.9mm, with standard 1.27mm pitch and RoHS-compliant finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FC | Frequency Control input | Selects switching frequency: VDD/open = 6kHz, GND = 50kHz, OUT = 130kHz - sets capacitor sizing and EMI profile. |
| 2 C1+ | Flying capacitor positive terminal | Connects to positive plate of C1; internal switch node toggles between VDD and OUT to pump charge. |
| 3 GND | Ground reference | Primary return path; connects to system ground plane; required for LV and SHDN logic thresholds. |
| 4 C1− | Flying capacitor negative terminal | Connects to negative plate of C1; alternates between GND and OUT to complete charge-transfer cycle. |
| 5 OUT | Output terminal | Delivers inverted (−VIN) or doubled (+2VIN) voltage; drives load directly; voltage droop scales with ROUT × ILOAD. |
| 6 LV | Mode select input | GND = inverter mode; OUT = doubler mode - determines internal switch configuration and input range validity. |
| 7 SHDN | Active-low shutdown | <0.3V = shutdown (IDD <1µA); >1.2V = active - must be tied to VDD (inverter) or GND (doubler) if unused. |
| 8 VDD | Positive supply input | +1.5V to +5.5V (inverter) or +2.5V to +5.5V (doubler); powers internal oscillator and switches; max 6.0V absolute rating. |
Key Features
| Feature | Design Value |
|---|---|
| Invert or double supply voltage | Single IC replaces discrete inverter/doubler circuits; eliminates need for separate DC-DC topologies in dual-rail systems. |
| Three selectable switching frequencies | Enables optimization: low-freq for lowest IQ, mid-freq for balanced size/IQ, high-freq for minimal 10µF caps and reduced EMI fundamental. |
| 87% efficiency at 50mA | Reduces thermal load in sealed enclosures (e.g., handheld medical sensors) versus older charge pumps like ICL7660. |
| 200µA quiescent current | Extends operational time in intermittent-use portable gear (e.g., glucose meters) where standby dominates duty cycle. |
| 1µA shutdown supply current | Meets ultra-low-power sleep requirements in battery-backed data loggers without external disconnect circuitry. |
| 12Ω output resistance | Predictable voltage droop simplifies rail design for op-amps or ADC references; avoids regulation complexity in non-critical analog stages. |
Applications
| Portable Medical Sensors | Handheld Test Equipment |
|---|---|
Use Scenario: Powering low-noise analog front-ends in battery-operated ECG or pulse oximeter modules requiring clean ±5V rails. IC Role / Device Role / Timing Role: Generates stable −5V inverted supply from +5V main rail using 10µF low-ESR tantalum caps; FC set to 50kHz for optimal ripple/noise balance. Use Value: Eliminates inductor-based converters, reducing BOM cost by $0.35 and PCB area by 25mm² while maintaining 12-bit ADC SNR. | Use Scenario: Providing dual-polarity bias for LCD contrast control and op-amp signal conditioning in pocket-sized multimeters. IC Role / Device Role / Timing Role: Configured as voltage doubler (LV = OUT) to generate +10V from +5V supply; FC = VDD for 6kHz operation to minimize quiescent draw during measurement idle. Use Value: Enables true autoranging with single-supply MCU while extending battery life to >200 hours on two AA cells. |
| Interface Power Supplies | Operational-Amplifier Power Supplies |
Use Scenario: Generating isolated −3.3V rail for RS-232 transceivers in industrial IoT gateways powered by 3.3V system bus. IC Role / Device Role / Timing Role: Inverter mode (LV = GND); FC = OUT for 130kHz to shrink 10µF caps to 4.7µF and avoid 30–50kHz noise coupling into CAN bus signals. Use Value: Prevents EMI-induced frame errors in adjacent 1Mbps CAN FD communication without ferrite beads or shielding. | Use Scenario: Supplying ±15V rails for rail-to-rail input op-amps in portable audio preamplifiers operating from single 9V battery. IC Role / Device Role / Timing Role: Two MAX860ISA units cascaded (Fig. 1) to produce −18V from 9V; LV pins grounded; FC = GND for 50kHz stability across temperature. Use Value: Achieves 110dB PSRR at 1kHz with <0.5% THD+N, outperforming single-stage charge pumps while fitting within 12mm × 12mm board area. |
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 (13/100/250 kHz), identical pinout and electrical specs except fS; same 50mA/12Ω/87% performance. | Better suited for ultra-low-ripple designs needing >100kHz fundamental noise rejection; less optimal for ultra-low-IQ due to higher min fS. | Select MAX861ISA when EMI-sensitive RF sections coexist on same PCB and 250kHz noise can be filtered more easily than 6kHz harmonics. |
| MAX660CPA+ | 100mA output, 6.5Ω ROUT, fixed 5/40kHz switching; DIP-8 or SO-8; no FC or LV pins - simpler but less flexible. | Higher current capability suits legacy designs needing >50mA; lacks frequency selectivity and mode flexibility of MAX860ISA. | Choose MAX660CPA+ only for drop-in replacement in existing ICL7660 sockets where 100mA headroom and fixed frequency are acceptable trade-offs. |
Compared with MAX861ISA, MAX860ISA offers lower minimum switching frequency (6kHz vs. 13kHz) for reduced quiescent current and better low-noise compatibility with audio-band circuits; versus MAX660CPA+, it trades raw current for configurability, smaller solution size, and modern BiCMOS efficiency - making it optimal for new portable designs prioritizing flexibility and space.
Availability
MAX860ISA is available at Aetrix Electronics and suitable for portable medical instruments, handheld test equipment, and interface power supplies requiring stable component supply, long-term lifecycle support, and guaranteed traceable 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 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 aging ICL7660-based solutions with higher efficiency, wider input range, and frequency agility - targeting portable, battery-constrained systems where inductor-free voltage conversion is mandatory.
FAQ
What is the maximum input voltage the MAX860ISA can accept in inverter mode?
The MAX860ISA supports an input voltage range of +1.5V to +5.5V in inverter mode. Its absolute maximum rating is +6.0V on VDD relative to GND; exceeding +5.5V risks violating the specified operating conditions and may reduce reliability or cause functional failure. Always maintain VDD ≤ +5.5V for guaranteed inverter-mode performance per the datasheet.
How does the FC pin affect capacitor selection for the MAX860ISA?
The FC pin directly determines the MAX860ISA's switching frequency (6/50/130 kHz), which governs optimal capacitor sizing: at 6kHz, 68µF C1/C2 are recommended; at 50kHz, 10µF suffices; at 130kHz, 4.7µF is adequate. Lower frequencies demand larger capacitors to maintain low output resistance and ripple, while higher frequencies allow smaller, cheaper, low-ESR ceramics - a key design lever enabled uniquely by the MAX860ISA.
Can the MAX860ISA be used as a direct replacement for the ICL7660 in an existing SO-8 layout?
Yes, the MAX860ISA is pin-compatible with the ICL7660 in SO-8 packages, but requires one wiring change: the ICL7660's OSC pin (pin 1) maps to MAX860ISA's FC pin, and the ICL7660's NC pin (pin 7) maps to MAX860ISA's SHDN pin, which must be tied to VDD (not left floating) for continuous operation. No PCB changes are needed beyond this jumper.
What is the output voltage accuracy of the MAX860ISA under varying load conditions?
The MAX860ISA has no internal voltage regulation; its output accuracy depends on load-induced droop via ROUT. With 12Ω typical output resistance, a 50mA load causes ~0.6V drop from ideal (e.g., −5.0V → −4.4V). Output voltage also varies with input voltage, temperature, and capacitor ESR. For precision rails, post-regulation or feedback compensation is required - the MAX860ISA provides predictable, unregulated conversion.
Does the MAX860ISA support parallel operation to increase output current?
Yes, multiple MAX860ISA units can be paralleled to reduce effective output resistance and increase available current. Each device requires its own C1 flying capacitor, while a shared C2 output capacitor (scaled by number of devices) serves all. The combined output resistance is ROUT/n, enabling up to ~100mA from two units - verified in Maxim's Figure 2 and confirmed in the "Paralleling Devices" section of the MAX860/MAX861 datasheet.
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:
- Obsolete
- 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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