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Analog Devices Inc./Maxim Integrated MAX680CPA+
- Part No.:
- MAX680CPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX680CPA+.pdf
- Description:
- IC REG CHARGE PUMP 2VIN DL 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:130
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Product details
Overview
The MAX680CPA+ from Maxim Integrated is a monolithic CMOS dual charge-pump voltage converter that generates ±10V outputs from a +5V input supply, with 150Ω positive and 90Ω negative output source impedances at +25°C, 8kHz internal oscillator frequency, and 500µA quiescent current - used in analog power supplies for op-amps requiring bipolar rails.
For engineers reviewing the MAX680CPA+ datasheet, MAX680CPA+ pinout, MAX680CPA+ application, or MAX680CPA+ equivalent, key selection criteria include input voltage range (+2V to +6V), external capacitor count (four required), output droop behavior under load, and DIP-8 package compatibility with through-hole prototyping and industrial control PCBs.
Technical Context
The MAX680CPA+ implements two independent switched-capacitor charge pumps: a positive doubler (VCC → V+) and an inverting pump (V+ → V−), both driven by an on-chip 8kHz oscillator. The positive pump charges C1 during phase one and transfers charge to C3; the negative pump uses V+ as its input rail and transfers charge from C2 to C4 to generate V−.
It operates without regulation - output voltages droop linearly with load current per source resistance (e.g., V+ = 2×VCC − (IL+ + IL−) × 150Ω). Output ripple is determined by reservoir capacitance and pump frequency: VRIPPLE ≈ ½ × IOUT × (1/8kHz) × (1/CR).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +2.0V to +6.0V - supports operation from 3V batteries up to 5V logic rails with full functionality. |
| Output Voltages | +10V and −10V nominal at light load from +5V input - no regulation; voltage drops linearly with load current. |
| Output Source Resistance | +150Ω (V+), −90Ω (V−) at +25°C - defines load-induced droop: e.g., 10mA load causes ~1.5V drop on V+. |
| Oscillator Frequency | 8kHz fixed - sets ripple frequency and minimum reservoir capacitor sizing (e.g., 10µF yields ~30mVpp at 5mA). |
| Quiescent Supply Current | 500µA at VCC = +5V - enables low-power battery operation in handheld instrumentation. |
| Efficiency | 95% voltage-conversion, 85% power-conversion - reflects low-loss CMOS switching and minimal drive overhead. |
| Operating Temperature | 0°C to +70°C - commercial-grade rating suitable for panel meters and data-acquisition enclosures. |
Pinout & Package
MAX680CPA+ is housed in an 8-pin plastic DIP (dual in-line package) with 0.3-inch body width and through-hole mounting. Pin spacing follows standard 0.1-inch grid.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (C1+) | Positive pump capacitor top plate | Connects to positive terminal of C1; alternately charged/discharged to double VCC. |
| 2 (C1−) | Positive pump capacitor bottom plate | Connects to ground or VCC depending on clock phase; forms flying capacitor node. |
| 3 (C2+) | Negative pump capacitor top plate | Connects to positive terminal of C2; referenced to V+ for inversion stage. |
| 4 (C2−) | Negative pump capacitor bottom plate | Connects to ground; forms second flying capacitor node for charge transfer to V−. |
| 5 (GND) | Analog ground reference | Common return for all capacitors and internal switches; must be low-impedance. |
| 6 (V−) | Negative output terminal | Delivers inverted output; sourced from C4 reservoir; droops with IL− × 90Ω. |
| 7 (V+) | Positive output terminal | Delivers doubled output; sourced from C3 reservoir; droops with (IL+ + IL−) × 150Ω. |
| 8 (VCC) | Positive input supply | Accepts +2V to +6V; powers both charge pumps and internal oscillator. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent charge pumps | Enables simultaneous +10V and −10V generation from single +5V rail without external regulators or inductors. |
| No external timing components | On-chip 8kHz oscillator eliminates need for crystals, RC networks, or external clocks - reduces BOM count. |
| Low quiescent current | 500µA operation allows use in battery-powered systems with multi-week standby life (e.g., handheld DMMs). |
| CMOS monolithic design | Integrates all switches, oscillator, and control logic on one die - avoids discrete MOSFET layout complexity and matching issues. |
| Four external capacitor requirement | Supports low-cost 10µF polarized electrolytics (C1–C4); eliminates need for precision or high-ESR components. |
Applications
| ±10V from +5V Logic Supply | ±6V from 3V Lithium Cell |
|---|---|
Use Scenario: Generating symmetric analog supply rails for op-amps and ADC drivers in industrial PLC I/O modules using only the system's existing +5V logic bus. IC Role / Device Role / Timing Role: Dual charge-pump voltage converter providing unregulated but stable ±10V outputs referenced to system ground. Use Value: Eliminates need for isolated DC/DC converters or dual-output transformers - reduces board area and EMI risk while maintaining 150Ω/90Ω source impedance for 10mA loads. | Use Scenario: Powering precision analog front-ends in portable multimeters powered by a single CR2032 coin cell. IC Role / Device Role / Timing Role: Bipolar rail generator converting 3V battery into ±6V outputs via charge-pump doubling and inversion stages. Use Value: Enables rail-to-rail op-amp operation with <500µA total quiescent draw - extends battery life beyond 200 hours at 1mA average load. |
| Operational Amplifier Power Supplies | Panel Meters & Data-Acquisition Systems |
Use Scenario: Supplying ±15V-compatible op-amps (e.g., OPA227) in low-noise sensor signal conditioning circuits where space prohibits transformer-based solutions. IC Role / Device Role / Timing Role: Unregulated dual-rail generator delivering ±10V with predictable droop behavior under dynamic load. Use Value: Provides sufficient headroom for 12-bit SAR ADC drivers and low-distortion amplifiers while allowing precise droop compensation via load-current sensing. | Use Scenario: Providing clean, low-ripple analog rails in 4½-digit digital panel meters with integrated LCD and microcontroller. IC Role / Device Role / Timing Role: Compact bipolar supply source using four 10µF electrolytics and DIP-8 footprint for easy hand-soldering and serviceability. Use Value: Achieves <30mVpp ripple at 5mA load with 10µF reservoir caps - meets EN 61000-4-3 immunity requirements without added filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual charge-pump voltage converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX681CPD+ | Integrates 1.5µF and 2.2µF capacitors internally; 14-pin DIP; same ±10V output capability. | Eliminates all external capacitors - ideal for space-constrained designs but requires different PCB footprint and layout. | Select MAX681CPD+ when minimizing component count and board area outweighs through-hole pin-count constraints. |
| MAX864CPA+ | 200kHz switching frequency; supports smaller 1µF–2.2µF external capacitors; higher efficiency at >1mA loads. | Better suited for compact, higher-current applications (e.g., portable oscilloscopes) where lower ripple and faster transient response are critical. | Choose MAX864CPA+ for new designs needing improved power density and reduced output impedance over temperature. |
Compared with MAX680CPA+, MAX681CPD+ removes external capacitors but increases pin count and package size, while MAX864CPA+ improves ripple and efficiency at the cost of higher operating frequency sensitivity and tighter capacitor tolerance requirements.
Availability
MAX680CPA+ is available at Aetrix Electronics and suitable for industrial control interfaces, handheld test equipment, and analog signal chain power supplies requiring stable component supply across extended product lifecycles.
Supply support for MAX680CPA+ 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) designs precision analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.
The MAX680 series belongs to Maxim's legacy charge-pump voltage converter product line, engineered specifically for low-noise, capacitor-based bipolar rail generation in space- and cost-sensitive analog systems.
FAQ
What is the maximum output current capability of the MAX680CPA+?
The MAX680CPA+ delivers up to 10mA from each output (V+ and V−) under typical conditions. At VCC = +5V and +25°C, the positive output source resistance is 150Ω and the negative is 90Ω, so V+ droops ~1.5V and V− droops ~0.9V at 10mA. The device is not rated for continuous >10mA per rail due to thermal and efficiency limits specified in the Absolute Maximum Ratings table.
Does the MAX680CPA+ require external timing components?
No, the MAX680CPA+ includes an on-chip 8kHz oscillator and requires no external resistors, capacitors, or crystals for clock generation. This simplifies design and improves reliability compared to discrete oscillator implementations. All timing is internally generated and factory-trimmed - users only need to connect four external capacitors (C1–C4) for charge pumping.
Can the MAX680CPA+ operate from a 3V battery?
Yes, the MAX680CPA+ supports input voltages from +2.0V to +6.0V, making it fully compatible with 3V lithium cells. At VCC = +3V, it generates approximately ±6V outputs (not ±10V), as the charge pumps scale linearly: V+ ≈ 2×VCC and V− ≈ −2×VCC under light load. This behavior is confirmed in the Applications section and Typical Operating Characteristics graphs.
How does output voltage droop behave under combined V+ and V− loading?
For the MAX680CPA+, V+ droop depends on the sum of both output currents: VDROP+ = (IL+ + IL−) × RS+. V− droop depends only on its own load: VDROP− = IL− × RS−. So if IL+ = 5mA and IL− = 5mA, V+ drops by (10mA × 150Ω) = 1.5V, and V− drops by (5mA × 90Ω) = 0.45V. This interdependence arises because the negative pump draws power from the V+ rail.
What capacitor values are recommended for the MAX680CPA+?
Maxim recommends 10µF polarized electrolytic capacitors for C1–C4 in general-purpose designs. For low-current applications (<1mA), 1µF can be used for C1/C2 (pump caps) and 4.7µF for C3/C4 (reservoir caps). All capacitors must be rated ≥6V for C1/C3 and ≥12V for C2/C4. Ceramic alternatives are not recommended due to microphonic effects and DC bias derating issues at required capacitance values.
MAX680CPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Ratiometric
- Output Configuration:
- Positive and Negative (Dual Rail)
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- ±2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 10mA
- Frequency - Switching:
- 8kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX680CPA+ FAQ
1.How can I place an order for MAX680CPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX680CPA+ 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 MAX680CPA+ reliable?
The price and inventory of MAX680CPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX680CPA+ is usually 5 days.
3.What payment methods are accepted for MAX680CPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX680CPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX680CPA+?
MAX680CPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX680CPA+ 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 MAX680CPA+?
For technical support, including MAX680CPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX680CPA+ requirements.
6.How does Aetrix verify that MAX680CPA+ is sourced from the original manufacturer or authorized distributors?
All MAX680CPA+ 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 MAX680CPA+ meets industry standards.
7.What is the process for return or replacement of MAX680CPA+?
All MAX680CPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX680CPA+, 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 MAX680CPA+ part is unused and in its original packaging.
Return procedure for MAX680CPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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