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Analog Devices Inc./Maxim Integrated MAX860CSA+
- Part No.:
- MAX860CSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX860CSA+.pdf
- Description:
- IC REG CHARG PUMP INV 50MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,283
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Product details
Overview
MAX860CSA+ from Maxim Integrated is a frequency-selectable, 50mA switched-capacitor voltage inverter/doubler IC designed for board-level DC-DC conversion without inductors. It operates from +1.5V to +5.5V (inverter) or +2.5V to +5.5V (doubler), delivers ≥87% efficiency at 50mA, features 12Ω output resistance, and supports three user-selectable switching frequencies (6/50/130kHz). It is used in portable medical instruments requiring compact, low-EMI negative rail generation.
For engineers reviewing the MAX860CSA+ datasheet, MAX860CSA+ pinout, MAX860CSA+ application, or MAX860CSA+ equivalent, key selection criteria include its 3-frequency control via FC pin, 200µA quiescent current, 1µA shutdown current, ±1.5V to ±5.5V output capability, and compatibility with low-ESR ceramic/tantalum flying capacitors.
Technical Context
The MAX860CSA+ implements a BiCMOS charge-pump architecture with internal MOSFET switches and a programmable oscillator. Its LV pin selects inverter (LV = GND) or doubler (LV = OUT) mode, while FC pin configures fundamental switching frequencies of 6kHz (FC = VDD/open), 50kHz (FC = GND), or 130kHz (FC = OUT).
It lacks regulation circuitry - output voltage follows VOUT ≈ –VIN (inverter) or VOUT ≈ +2×VIN (doubler), with load-dependent droop governed by 12Ω effective output resistance and external capacitor ESR. Shutdown is active-low on SHDN, reducing supply current to <1µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 50mA max continuous - supports moderate-power op-amp rails or LCD bias supplies without external inductors. |
| Switching Frequencies | 6/50/130kHz - enables trade-off between capacitor size (higher fS → smaller C1/C2) and quiescent current (lower fS → lower IDD). |
| Efficiency | 87% at 50mA (inverter, VDD = 5V) - reduces thermal load vs. linear regulators in battery-powered systems. |
| Quiescent Current | 200µA typical - extends battery life in always-on sensor nodes or portable diagnostics equipment. |
| Shutdown Current | <1µA - enables deep-sleep power management in handheld medical devices. |
| Output Resistance | 12Ω (with 0.2Ω ESR caps) - determines load-induced voltage droop: ΔV = ILOAD × 12Ω (e.g., –0.6V at 50mA). |
| Input Voltage Range | +1.5V to +5.5V (inverter); +2.5V to +5.5V (doubler) - compatible with single-cell Li-ion, 3.3V logic, and 5V bus systems. |
Pinout & Package
MAX860CSA+ is housed in an 8-pin SO (Small Outline) package, 3.9mm × 4.9mm, RoHS-compliant, with standard 1.27mm pitch. Pin 1 is FC (Frequency Control), and the package marking includes "CSA+" indicating commercial temperature range (0°C to +70°C) and lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FC | Frequency Control input | Selects switching frequency: VDD/open = 6kHz, GND = 50kHz, OUT = 130kHz - sets noise profile and capacitor sizing. |
| 2 C1+ | Flying capacitor positive terminal | Connects to one side of flying capacitor C1 - forms charge-transfer path during pump cycle. |
| 3 GND | Ground reference | System ground return for all internal circuits and external capacitors - must be low-impedance. |
| 4 C1− | Flying capacitor negative terminal | Connects to other side of flying capacitor C1 - alternates polarity with C1+ to transfer charge. |
| 5 OUT | Inverted or doubled output | Delivers –VIN (LV = GND) or +2×VIN (LV = OUT); output impedance dominates load regulation. |
| 6 LV | Mode selection input | LV = GND → inverter; LV = OUT → doubler - defines topology and input voltage range. |
| 7 SHDN | Active-low shutdown control | Drives low to disable oscillator and switches; pulls to VDD for normal operation in inverter mode. |
| 8 VDD | Positive supply input | Accepts +1.5V to +5.5V; powers internal logic and switches - requires local 0.1µF bypass. |
Key Features
| Feature | Design Value |
|---|---|
| Three selectable frequencies | 6/50/130kHz - allows optimization of capacitor size, EMI, and quiescent current per system constraints. |
| No-inductor design | Uses only two external capacitors - eliminates magnetic components, PCB area, and EMI from inductive switching. |
| Low quiescent current | 200µA typical - enables multi-day battery operation in portable instrumentation with intermittent use. |
| 1µA shutdown mode | Reduces system standby power to nanoampere levels - critical for FDA-cleared wearable diagnostics. |
| 12Ω output resistance | Enables predictable load droop modeling (ΔV = ILOAD × 12Ω) - simplifies rail budgeting in analog front-ends. |
Applications
| Portable Medical Sensors | Handheld Test Equipment |
|---|---|
Use Scenario: Powering dual-rail op-amps in battery-operated ECG front-end modules requiring ±3.3V from a single 3.7V Li-ion cell. IC Role / Device Role / Timing Role: Inverting charge-pump generating stable –3.3V rail with <100mV droop at 20mA sensor signal conditioning load. Use Value: Eliminates need for discrete inductor-based DC-DC, reducing BOM cost by $0.35 and PCB area by 22mm². | Use Scenario: Providing negative bias for LCD contrast control in handheld multimeters powered by AA batteries. IC Role / Device Role / Timing Role: Low-noise inverter operating at 50kHz (FC = GND) to avoid interference with 50/60Hz AC measurement circuits. Use Value: Achieves ripple <15mVpp with 4.7µF ceramic caps, meeting display clarity requirements without added filtering. |
| Industrial Interface Power | Operational Amplifier Supplies |
Use Scenario: Generating isolated –5V rail for RS-232 transceivers in PLC I/O modules using 5V logic supply. IC Role / Device Role / Timing Role: Doubler configured (LV = OUT) to produce +10V, then inverted externally - leverages MAX860CSA+'s wide input range. Use Value: Supports 5V-tolerant interface ICs without requiring separate high-voltage DC-DC, simplifying certification. | Use Scenario: Supplying ±5V rails for precision instrumentation amplifiers in portable data loggers. IC Role / Device Role / Timing Role: Dual MAX860CSA+ devices (one inverter, one doubler) sharing VDD and GND - enables symmetric ±5V from 5V input. Use Value: Delivers matched source impedance (12Ω each rail) for common-mode rejection >100dB in differential signal paths. |
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, fixed 5kHz/40kHz frequencies, higher 6.5Ω output resistance, no FC/LV pins. | Higher current but less flexible frequency/noise control; requires OSC pin handling instead of SHDN. | Choose MAX660CPA+ only if >50mA load or legacy socket compatibility is required - not drop-in for MAX860CSA+. |
| ICL7660ACPA+ | 10mA output, fixed 10kHz frequency, 55Ω output resistance, no shutdown or frequency select. | Limited to ultra-low-power signal conditioning; unsuitable for >20mA loads or noise-sensitive designs. | Use ICL7660ACPA+ only for cost-sensitive, low-current applications where efficiency and noise are secondary. |
Compared with MAX660CPA+ and ICL7660ACPA+, the MAX860CSA+ offers superior frequency flexibility and lower quiescent current, making it optimal for modern portable instrumentation where EMI control and battery life are prioritized over raw output current.
Availability
MAX860CSA+ is available at Aetrix Electronics and suitable for portable medical sensors, handheld test equipment, industrial interface power supplies, and operational-amplifier power supplies requiring stable component supply across production lifecycles.
Supply support for MAX860CSA+ 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 communication applications.
The MAX860/MAX861 product line was designed to replace legacy charge pumps like the ICL7660 with higher efficiency, lower quiescent current, and programmable frequency - targeting space-constrained, battery-powered instrumentation.
FAQ
What is the maximum output current specification for the MAX860CSA+?
The MAX860CSA+ is rated for 50mA continuous output current in both inverter and doubler configurations. This value is guaranteed under typical conditions (VDD = 5V, TA = +25°C, C1 = C2 = 10µF, low-ESR capacitors). Peak current capability may reach 60mA briefly, but sustained operation above 50mA risks thermal derating or reduced efficiency. The MAX860CSA+ datasheet specifies 50mA as the maximum recommended load for reliable long-term performance.
How does the FC pin affect the operation of the MAX860CSA+?
The FC (Frequency Control) pin on the MAX860CSA+ selects one of three fundamental switching frequencies: 6kHz when tied to VDD or left open, 50kHz when grounded, and 130kHz when connected to OUT. Each frequency alters capacitor sizing requirements, quiescent current draw, and EMI profile. For example, 130kHz allows use of 2.2µF flying capacitors but increases no-load supply current to ~2.6mA, whereas 6kHz supports larger 68µF caps and draws only ~0.5mA - enabling system-specific optimization.
Can the MAX860CSA+ be used as a voltage doubler, and what are the input requirements?
Yes, the MAX860CSA+ can operate as a positive voltage doubler by connecting the LV pin to the OUT pin. In this mode, it accepts input voltages from +2.5V to +5.5V and produces a nominal output of +2×VIN. Unlike inverter mode, the doubler configuration requires LV = OUT for all input voltages and exhibits slightly higher no-load supply current. Output regulation remains unregulated, with droop determined by 12Ω output resistance and external capacitor ESR - e.g., +9.4V output at 50mA load from a +5V input.
What is the shutdown behavior of the MAX860CSA+, and how is it controlled?
The MAX860CSA+ features an active-low shutdown input (SHDN, Pin 7) that reduces total supply current to less than 1µA when driven below 0.3V. In inverter mode (LV = GND), SHDN must be pulled to VDD for normal operation; leaving it floating is not permitted. During shutdown, internal oscillator and switch drivers are disabled, halting charge transfer. Loads connected from OUT to GND are unpowered, though reverse current paths exist - designers must ensure external circuitry does not back-drive the OUT pin during shutdown.
Is the MAX860CSA+ pin-compatible with the ICL7660 or MAX660?
No, the MAX860CSA+ is not pin-compatible with the ICL7660 or MAX660. While all three are 8-pin SO-packaged charge pumps, their pin functions differ significantly: the ICL7660 and MAX660 use Pin 7 as OSC (oscillator output), whereas the MAX860CSA+ uses Pin 7 as SHDN (active-low shutdown). Additionally, Pin 1 is FC on MAX860CSA+, but OSC on the others. Direct replacement requires PCB layout modification - specifically, re-routing Pin 7 and adapting Pin 1 functionality. Compatibility is functional (not mechanical), requiring wiring changes.
MAX860CSA+ 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX860CSA+ FAQ
1.How can I place an order for MAX860CSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX860CSA+ 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 MAX860CSA+ reliable?
The price and inventory of MAX860CSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX860CSA+ is usually 5 days.
3.What payment methods are accepted for MAX860CSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX860CSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX860CSA+?
MAX860CSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX860CSA+ 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 MAX860CSA+?
For technical support, including MAX860CSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX860CSA+ requirements.
6.How does Aetrix verify that MAX860CSA+ is sourced from the original manufacturer or authorized distributors?
All MAX860CSA+ 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 MAX860CSA+ meets industry standards.
7.What is the process for return or replacement of MAX860CSA+?
All MAX860CSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX860CSA+, 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 MAX860CSA+ part is unused and in its original packaging.
Return procedure for MAX860CSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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