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Analog Devices Inc./Maxim Integrated MAX865EUA
- Part No.:
- MAX865EUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX865EUA.pdf
- Description:
- IC REG CHARGE PUMP INV DL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,079
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Product details
Overview
MAX865EUA from Maxim Integrated is a CMOS dual-output charge-pump DC-DC converter in an 8-pin µMAX package. It generates +2×VIN and −2×VIN outputs from a single +1.5V to +6.0V input, requires only four external capacitors, delivers up to 20mA per output, and operates with a guaranteed 20kHz–38kHz oscillator frequency for low-audio-noise performance. It is used in GaAsFET biasing and split-supply analog circuitry.
For engineers reviewing the MAX865EUA datasheet, MAX865EUA pinout, MAX865EUA application, or MAX865EUA equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts for split-rail charge-pump designs.
Technical Context
The MAX865EUA integrates a two-stage switched-capacitor topology: first a voltage-doubling charge pump (IN → V+), then an inverting stage (V+ → V−), both driven by an internal oscillator with fixed 50% duty cycle. Its architecture avoids inductors and uses only ceramic or electrolytic capacitors.
It features non-regulated outputs with 75Ω typical V+ source impedance and 140Ω typical V− source impedance at +25°C, VIN = 5V. Output voltage droop scales linearly with load current, and efficiency peaks at 95% (VIN = 5V, light load) but declines under heavier loads due to fixed switching losses and capacitor ESR effects.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +1.5V to +6.0V - supports single-cell Li+ (3.0–4.2V), triple-NiCd/NiMH (3.6V), or 5V logic rails without level-shifting. |
| Oscillator Frequency | 20kHz to 38kHz - ensures switching noise remains above audible range while minimizing capacitor size and EMI filtering burden. |
| V+ Output Impedance | 75Ω (typ) - defines maximum load-induced droop: e.g., 10mA load causes ~0.75V drop from ideal +2×VIN. |
| V− Output Impedance | 140Ω (typ) - higher than V+, reflecting cascaded conversion loss; limits usable negative current before excessive droop. |
| Operating Temperature | −40°C to +85°C - qualified for industrial and portable wireless handset environments with no derating required. |
| Package | 8-pin µMAX (3.05mm × 3.05mm × 1.11mm) - occupies 50% board area vs. SOIC-8, enabling ultra-compact GaAsFET bias solutions. |
| Efficiency | 85% (min), 95% (typ) at VIN = 5V, light load - enables >10-hour battery life in low-power handhelds using 3.3µF capacitors. |
Pinout & Package
The MAX865EUA is housed in an 8-pin µMAX package (3.05mm × 3.05mm, 1.11mm height), pin-compatible with other µMAX charge pumps including MAX864 and MAX866. The exposed substrate is connected to V+ for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 C1− | Flying capacitor negative terminal (boost stage) | Connects to negative side of C1; critical path for charge transfer into V+; sensitive to trace inductance. |
| 2 C2+ | Flying capacitor positive terminal (inverter stage) | Accepts +2×VIN from V+ node; must withstand ≥12V rating when VIN = 6V. |
| 3 C2− | Flying capacitor negative terminal (inverter stage) | Reference node for inverter switching; ties to GND during charging phase; shared ground return path. |
| 4 V− | Negative regulated output | Delivers −2×VIN; not internally regulated-voltage sags linearly with load current due to 140Ω source impedance. |
| 5 GND | Power and signal reference | Single ground plane connection point; must be low-impedance to minimize noise coupling between stages. |
| 6 IN | Positive input supply | Accepts +1.5V to +6.0V; bypass capacitor required close to pin to suppress switching transients. |
| 7 V+ | Positive output | Delivers +2×VIN; supplies both external load and V− stage; droop affects entire system rail stability. |
| 8 C1+ | Flying capacitor positive terminal (boost stage) | Connects to positive side of C1; switches between IN and V+ nodes; high dv/dt node requiring short routing. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-output charge-pump topology | Generates independent +2×VIN and −2×VIN rails from one input-eliminates need for separate boost + inverter ICs or inductors. |
| Ultra-small µMAX package | 3.05mm × 3.05mm footprint fits within tight RF front-end layouts, such as GSM/GPRS handset GaAsFET bias sections. |
| Four-capacitor solution | Reduces BOM count and layout complexity versus transformer-based or multi-IC split-rail solutions; supports 1µF–100µF capacitor range. |
| Audible-noise-free operation | 20kHz–38kHz fixed-frequency switching avoids 20Hz–20kHz human-audible band-critical for noise-sensitive audio and RF circuits. |
| Wide temperature qualification | −40°C to +85°C operation ensures reliability in automotive infotainment modules and industrial sensor nodes without thermal derating. |
Applications
| Low-Voltage GaAsFET Bias | VCO and GaAsFET Supplies |
|---|---|
|
Use Scenario: Biasing gallium arsenide FETs in GSM/EDGE power amplifiers where compact size and low noise are essential. IC Role / Device Role / Timing Role: Provides stable +5V and −5V rails from a single 2.7V–4.2V Li+ cell to set gate-source and drain-source voltages. Use Value: Enables <1.5mm² total solution size with <25mV ripple at 5mA load-meeting RF linearity and EVM requirements. |
Use Scenario: Powering voltage-controlled oscillators and GaAsFET driver stages in portable wireless transceivers. IC Role / Device Role / Timing Role: Delivers matched ±VOUT rails with synchronized switching to minimize supply-induced phase noise. Use Value: 20kHz–38kHz oscillator avoids injection locking in VCOs; 75Ω/140Ω output impedances allow predictable droop compensation. |
| Split Supply from 3 Ni Cells | Low-Cost Split Supply for Data-Acquisition Systems |
|
Use Scenario: Generating ±4.5V rails from three series NiCd/NiMH cells (3.6V nominal) in handheld test equipment. IC Role / Device Role / Timing Role: Doubles and inverts input to create symmetrical rails without transformers or LDOs. Use Value: Eliminates 40% BOM cost vs. dual-LDO + inductor solution; maintains >85% efficiency across 1–10mA load range. |
Use Scenario: Providing ±2.5V analog supply for 12-bit ADCs and op-amps in battery-powered data loggers. IC Role / Device Role / Timing Role: Supplies precision analog circuitry with low-ripple, low-noise dual rails derived from 3.3V microcontroller rail. Use Value: 10mVpp ripple (with 3.3µF caps) meets SNR >70dB requirement; µMAX package allows placement near ADC ground plane. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output charge-pump applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX864EUA | Includes logic-controlled shutdown and selectable oscillator frequencies (100kHz/200kHz); same µMAX-8 package and pinout. | Better suited for systems requiring dynamic power cycling or higher-frequency operation to reduce capacitor size. | Select MAX864EUA when active enable control or >100kHz switching is needed; MAX865EUA preferred for lowest quiescent current and audio-noise immunity. |
| LM2776IDR | TI device with integrated soft-start, lower 60Ω V+ impedance, but requires five external capacitors and uses MSOP-10 package. | Offers tighter output regulation and lower noise floor, but larger footprint and higher BOM count. | Choose LM2776IDR for precision analog rails demanding <10mV droop at 10mA; MAX865EUA remains optimal for space-constrained RF biasing. |
Compared with MAX864EUA and LM2776IDR, the MAX865EUA delivers the smallest PCB footprint and lowest audible noise among dual-output charge pumps, making it uniquely suitable for miniature wireless front-ends where board area and EMI sensitivity are primary constraints.
Availability
MAX865EUA is available at Aetrix Electronics and suitable for low-voltage GaAsFET biasing, portable VCO supplies, and compact split-rail data-acquisition systems requiring stable component supply across extended temperature ranges.
Supply support for MAX865EUA 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, communications, and consumer markets.
The MAX865EUA belongs to Maxim's legacy charge-pump product line, designed specifically for ultra-compact, inductorless dual-rail generation in battery-powered RF and analog systems.
FAQ
What is the absolute maximum input voltage rating for the MAX865EUA?
The MAX865EUA has an absolute maximum IN-to-GND voltage rating of +6.2V. Exceeding this value-even momentarily-may cause permanent damage. The recommended operating range remains +1.5V to +6.0V, and operation above +6.0V voids parametric guarantees. Always include input overvoltage protection if system rails may transiently exceed 6.0V. The MAX865EUA's internal protection does not cover overvoltage events.
Can the MAX865EUA generate regulated ±5V outputs from a 3.3V input?
No-the MAX865EUA is an unregulated charge pump: its V+ and V− outputs scale directly with input voltage (V+ ≈ +2×VIN, V− ≈ −2×VIN) and droop under load. From 3.3V input, it delivers approximately +6.6V and −6.6V open-circuit, dropping to +5.8V/−5.8V at 10mA due to 75Ω/140Ω output impedances. For regulated ±5V, pair MAX865EUA with post-regulator LDOs like MAX8865 or use a fully regulated alternative such as MAX1722.
What capacitor types and values are recommended for stable operation of the MAX865EUA?
Use 3.3µF polarized aluminum or tantalum electrolytics (rated ≥10V) for C1–C4 in standard applications; ceramic capacitors ≥1µF (X5R/X7R, 10V rating) are acceptable where space or ESR matters. Avoid NP0/C0G ceramics below 1µF-they lack sufficient capacitance for low-ripple operation. All capacitors must have ESR <1Ω to maintain specified 75Ω/140Ω output impedances. The MAX865EUA datasheet validates performance with 3.3µF parts across −40°C to +85°C.
Does the MAX865EUA support paralleling multiple units to increase output current?
Yes-multiple MAX865EUA devices can be paralleled to reduce effective output impedance: V+ impedance scales as RS+/N and V− impedance as RS−/N, where N is the number of units. Each unit requires its own C1 and C2 flying capacitors, but C3 and C4 reservoir capacitors may be shared. Layout must ensure matched trace lengths and common ground to prevent circulating currents. This technique is documented in Figure 3 of the MAX865EUA datasheet and validated for up to three units.
How does temperature affect the oscillator frequency and output impedance of the MAX865EUA?
The MAX865EUA oscillator frequency decreases with rising temperature-from ~34kHz at −40°C to ~23kHz at +85°C (VIN = 5V). Output impedance increases: V+ resistance rises from ~75Ω at +25°C to ~100Ω at +85°C; V− resistance climbs from ~140Ω to ~250Ω over the same range. These shifts are characterized in Figures MAX865-09 and MAX865-08 and must be factored into worst-case droop calculations for high-temperature industrial designs using MAX865EUA.
MAX865EUA 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:
- Obsolete
- Function:
- Ratiometric
- Output Configuration:
- Positive or Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 1.5V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 20mA
- Frequency - Switching:
- 18kHz ~ 34kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX865EUA FAQ
1.How can I place an order for MAX865EUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX865EUA 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 MAX865EUA reliable?
The price and inventory of MAX865EUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX865EUA is usually 5 days.
3.What payment methods are accepted for MAX865EUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX865EUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX865EUA?
MAX865EUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX865EUA 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 MAX865EUA?
For technical support, including MAX865EUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX865EUA requirements.
6.How does Aetrix verify that MAX865EUA is sourced from the original manufacturer or authorized distributors?
All MAX865EUA 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 MAX865EUA meets industry standards.
7.What is the process for return or replacement of MAX865EUA?
All MAX865EUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX865EUA, 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 MAX865EUA part is unused and in its original packaging.
Return procedure for MAX865EUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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