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Analog Devices Inc./Maxim Integrated MAX860IUA+
- Part No.:
- MAX860IUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX860IUA+.pdf
- Description:
- IC REG CHARG PUMP INV 50MA 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,659
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Product details
Overview
MAX860IUA+ from Maxim Integrated is a frequency-selectable, 50mA switched-capacitor voltage inverter/doubler IC designed for low-noise, inductorless DC-DC conversion in space-constrained systems. It operates from +1.5V to +5.5V (inverter) or +2.5V to +5.5V (doubler), delivers >90% efficiency at full load, features three user-selectable switching frequencies (6/50/130 kHz), and achieves 12Ω output resistance with 10µF capacitors - enabling compact, EMI-optimized power rails for portable medical instruments and handheld test equipment.
For engineers reviewing the MAX860IUA+ datasheet, MAX860IUA+ pinout, MAX860IUA+ application, or MAX860IUA+ equivalent, key selection criteria include its 8-pin µMAX® package, active-low shutdown (<1µA), LV pin configuration dependency on mode (GND for inverter, OUT for doubler), and FC pin's direct oscillator-frequency control - all critical for battery-powered operational-amplifier supply design and interface rail generation where inductors are prohibited.
Technical Context
The MAX860IUA+ implements a BiCMOS charge-pump architecture with internal switches driven directly at oscillator frequency (no division), supporting both inverting (VOUT ≈ –VIN) and doubling (VOUT ≈ +2VIN) topologies via LV pin state. Its FC pin selects one of three discrete switching frequencies without external components - 6kHz (FC = VDD/open), 50kHz (FC = GND), or 130kHz (FC = OUT) - each trading off capacitor size, quiescent current, and noise spectrum placement.
Output regulation is unregulated but highly predictable: circuit output resistance (ROUT ≈ RO + 4×ESRC1 + ESRC2 + 1/(fS×C1)) yields ~600mV drop at 50mA load with recommended 10µF/0.2Ω ESR capacitors, and shutdown disables all active circuitry while maintaining reverse-current paths dependent on topology - critical for system-level power sequencing in portable computers and hand-held instruments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 50mA continuous - supports rail generation for dual-supply op-amps and LCD bias without inductors |
| Switching Frequencies | 6/50/130kHz - enables capacitor size reduction (e.g., 68µF→4.7µF) and noise-band avoidance |
| Input Voltage Range | +1.5V to +5.5V (inverter); +2.5V to +5.5V (doubler) - compatible with single-cell Li-ion, alkaline, and 3.3V/5V logic rails |
| Quiescent Current | 200µA typical - extends battery life in always-on medical sensors and portable instrumentation |
| Shutdown Current | <1µA - meets ultra-low-power requirements for sleep-mode subsystems |
| Output Resistance | 12Ω typical - defines load regulation: e.g., –5.0V no-load → –4.4V at 50mA (ΔV = I×R) |
| Efficiency | 87% at 50mA - exceeds ICL7660/MAX660 in mid-to-high load range due to higher fS and lower RO |
Pinout & Package
MAX860IUA+ is housed in an 8-pin µMAX® package (1.11mm height, 3mm × 3mm footprint), RoHS-compliant, with exposed pad for thermal enhancement. Pin mapping is identical to SO-8 but with reduced area and improved high-frequency performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FC (Pin 1) | Frequency Control input | Selects oscillator frequency: VDD/open = 6kHz, GND = 50kHz, OUT = 130kHz - sets capacitor sizing and EMI profile |
| C1+ (Pin 2) | Flying capacitor positive terminal | Drives charge-transfer node; connects to C1 anode - requires low-ESR capacitor (≤0.2Ω) for minimal ROUT |
| GND (Pin 3) | Ground reference | Common return for all internal circuits and external capacitors - must be low-impedance for ripple suppression |
| C1– (Pin 4) | Flying capacitor negative terminal | Completes flying-capacitor path; connects to C1 cathode - polarity-critical in inverter configuration |
| OUT (Pin 5) | Output voltage terminal | Delivers inverted (–VIN) or doubled (+2VIN) rail; drives load and C2 - output impedance dominates load regulation |
| LV (Pin 6) | Low-voltage operation mode select | GND = inverter mode; OUT = doubler mode - determines internal switch routing and VIN range validity |
| SHDN (Pin 7) | Active-low shutdown control | <0.3V = shutdown (<1µA IQ); VDD = enabled - must be tied high in inverter mode if unused |
| VDD (Pin 8) | Positive input supply | Accepts +1.5V to +5.5V; powers all internal circuitry - bypass capacitor required for stability |
Key Features
| Feature | Design Value |
|---|---|
| Invert or double input voltage | Single IC supports two topologies via LV pin - eliminates need for separate inverter/doubler BOMs |
| Three selectable switching frequencies | Hardware-configurable fS (6/50/130kHz) enables optimal capacitor selection without redesigning layout |
| High-frequency operation | 130kHz max fS reduces C1/C2 size by >10× vs. 5kHz ICL7660 - cuts board area and cost in portable designs |
| 200µA quiescent current | Enables >1-year battery life in 10µA-average-current medical sensors using intermittent sampling |
| 12Ω output resistance | Predictable load regulation allows accurate rail budgeting without feedback - simplifies analog front-end design |
Applications
| Portable Medical Sensors | Hand-Held Test Equipment |
|---|---|
Use Scenario: Powering dual-rail op-amps in battery-operated ECG front-ends requiring ±2.5V from a single 3.7V Li-ion cell. IC Role / Device Role / Timing Role: Inverter generating –2.5V rail; LV = GND, FC = GND for 50kHz balance of efficiency and capacitor size. Use Value: Eliminates inductor, reduces EMI-sensitive analog section noise, and maintains 87% efficiency at 20mA load - extending clinical-grade sensor runtime. | Use Scenario: Generating +5V and –5V rails for precision ADC drivers in handheld multimeters powered by AA batteries. IC Role / Device Role / Timing Role: Dual MAX860IUA+ devices: one as doubler (+5V), one as inverter (–5V); FC = OUT for 130kHz to minimize 10µF capacitor footprint. Use Value: Achieves rail symmetry within 50mV across 0–50mA load, enabling <12-bit ENOB without external regulation - critical for metrology accuracy. |
| Operational-Amplifier Power Supplies | Interface Power Supplies |
Use Scenario: Biasing rail-to-rail op-amps in portable audio codecs where space prohibits inductive converters. IC Role / Device Role / Timing Role: Inverter supplying –1.8V from 3.3V system rail; FC = VDD for 6kHz to minimize quiescent current during standby. Use Value: 200µA IQ enables 30-day shelf life in always-ready audio recorders; 12Ω ROUT ensures <100mV droop at peak signal current. | Use Scenario: Providing isolated –3.3V bias for RS-232 transceivers in industrial handheld terminals operating from 5V USB power. IC Role / Device Role / Timing Role: Inverter configured for –3.3V output; SHDN controlled by host MCU to disable during idle periods. Use Value: <1µA shutdown current reduces system standby draw to <5µA - meeting stringent energy certification requirements. |
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 |
|---|---|---|---|
| MAX861IUA+ | Higher base frequencies (13/100/250kHz), same pinout and functionality | Better suited for ultra-compact designs needing smallest possible capacitors; higher fS increases IQ slightly | Select MAX861IUA+ when 250kHz operation is required to fit 2.2µF C1/C2 in tight layouts |
| MAX660CPA+ | 100mA output, 5/40kHz fS, SO-8 only, no FC/LV pins - fixed inverter-only topology | Higher current capability but larger capacitors needed; lacks frequency and topology flexibility | Choose MAX660CPA+ only when 100mA load and legacy ICL7660 pin compatibility are mandatory |
Compared with MAX861IUA+, MAX860IUA+ offers lower quiescent current (200µA vs. 250µA) and reduced EMI at 6kHz, making it preferable for battery longevity; versus MAX660CPA+, MAX860IUA+ provides topology selection and frequency tuning at the cost of 50mA output limit - ideal for modern low-power, multi-rail portable systems.
Availability
MAX860IUA+ is available at Aetrix Electronics and suitable for portable medical instruments, hand-held test equipment, operational-amplifier power supplies, and interface power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX860IUA+ 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 is a semiconductor company specializing in analog and mixed-signal ICs for power management, sensing, and communications - acquired by Analog Devices in 2021 but retaining distinct product branding and technical documentation.
The MAX860/MAX861 family was engineered to replace legacy charge pumps (ICL7660, MAX660) with higher efficiency, selectable frequency, and dual-mode operation - targeting space-constrained, battery-powered applications where inductors are impractical.
FAQ
What is the maximum input voltage rating for MAX860IUA+?
The absolute maximum supply voltage (VDD to GND) for MAX860IUA+ is +6.0V. Continuous operation is specified from +1.5V to +5.5V in inverter mode and +2.5V to +5.5V in doubler mode. Exceeding +6.0V risks permanent damage, and operation above +5.5V violates the guaranteed electrical characteristics - always verify input rail tolerance margins before deploying MAX860IUA+ in 5V-system designs.
How does the LV pin affect MAX860IUA+ operation?
The LV pin configures MAX860IUA+ topology: connecting LV to GND enables inverter mode (VOUT ≈ –VIN), while connecting LV to OUT enables doubler mode (VOUT ≈ +2VIN). Floating LV is not recommended - in inverter mode, it may cause erratic behavior; in doubler mode, it prevents proper startup. The LV connection directly alters internal switch routing and validates the applicable input voltage range per mode - critical for correct MAX860IUA+ functionality.
Can MAX860IUA+ be used as a direct replacement for ICL7660?
MAX860IUA+ can replace ICL7660 in most sockets with one wiring change: pin 7 (SHDN) must be tied to VDD (not floated) to enable operation, since ICL7660 has no shutdown function. FC pin (pin 1) is backward-compatible with ICL7660's OSC pin - floating or connecting to VDD yields functional 6kHz operation. However, MAX860IUA+ offers higher efficiency, lower output resistance, and frequency selection - making it a functional upgrade, not just a drop-in substitute.
What capacitor values are recommended for MAX860IUA+ at 130kHz switching frequency?
For MAX860IUA+ operating at 130kHz (FC = OUT), the recommended flying and reservoir capacitors are 4.7µF each, using low-ESR types (≤0.2Ω). This value balances output resistance, ripple, and physical size - smaller than the 68µF needed at 6kHz. Using 10µF capacitors at 130kHz is acceptable but provides no significant benefit over 4.7µF and wastes board area. Always verify capacitor voltage rating exceeds |VOUT| + |VIN|.
Does MAX860IUA+ require a bypass capacitor on the VDD pin?
Yes, MAX860IUA+ requires a bypass capacitor on VDD to suppress switching noise and ensure stable startup. A 0.1µF ceramic capacitor placed as close as possible to pins 8 (VDD) and 3 (GND) is sufficient when loading from VDD to OUT. If loading from OUT to GND (inverter) or VDD to GND (doubler), use a larger bypass capacitor - typically 10µF aluminum electrolytic or tantalum - to handle the pulsed 2×IOUT supply current and prevent input rail collapse during switching transitions.
MAX860IUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-uMAX/uSOP
MAX860IUA+ FAQ
1.How can I place an order for MAX860IUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX860IUA+ 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 MAX860IUA+ reliable?
The price and inventory of MAX860IUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX860IUA+ is usually 5 days.
3.What payment methods are accepted for MAX860IUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX860IUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX860IUA+?
MAX860IUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX860IUA+ 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 MAX860IUA+?
For technical support, including MAX860IUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX860IUA+ requirements.
6.How does Aetrix verify that MAX860IUA+ is sourced from the original manufacturer or authorized distributors?
All MAX860IUA+ 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 MAX860IUA+ meets industry standards.
7.What is the process for return or replacement of MAX860IUA+?
All MAX860IUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX860IUA+, 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 MAX860IUA+ part is unused and in its original packaging.
Return procedure for MAX860IUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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