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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:3,091
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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 single +5V input supply, featuring 8kHz on-chip oscillator, 150Ω typical positive output source resistance, 90Ω typical negative output source resistance, and operation across 0°C to +70°C. It requires four external capacitors and delivers up to 10mA output current per rail in analog power supply applications.
For engineers reviewing the MAX680CPA datasheet, MAX680CPA pinout, MAX680CPA application, or MAX680CPA equivalent, key selection criteria include input voltage range (+2V to +6V), output source impedance temperature dependence, ±10V load regulation behavior, and compatibility with low-cost polarized electrolytic pump/reservoir capacitors (e.g., 4.7µF–22µF).
Technical Context
The MAX680CPA implements two independent switched-capacitor stages: a positive charge pump (doubling VCC to V+) using internal P/N-MOSFET switches S1–S4 and external C1/C3, and an inverting charge pump (generating V− from V+) using S5–S8 and external C2/C4. The 8kHz oscillator drives complementary nonoverlapping phases for both pumps.
Unlike the MAX681, the MAX680CPA lacks internal capacitors and relies entirely on external components for energy transfer and reservoir functions. Its output voltages droop linearly with load current due to fixed source resistances-V+ droop depends on (IL+ + IL−) × RS+, while V− droop equals IL− × RS−-enabling predictable rail collapse modeling without regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +2.0V to +6.0V - supports 3V battery and 5V logic rails without external regulators |
| Positive Output Voltage | +10V (no load, VCC = +5V) - drops linearly with load due to ~150Ω source resistance |
| Negative Output Voltage | −10V (no load, VCC = +5V) - sourced from V+, so V− stability depends on V+ headroom |
| Oscillator Frequency | 8kHz - sets ripple frequency and capacitor sizing (e.g., 10µF yields ~30mVpp at 5mA) |
| Supply Current | 1mA typical (VCC = +5V, no load) - enables low-quiescent-power portable designs |
| Voltage Efficiency | 95% typical (V+, RL = ∞) - high conversion efficiency reduces thermal stress in sealed enclosures |
| Power Efficiency | 85% typical (RL = 10kΩ) - reflects combined losses in both pump stages and switch conduction |
Pinout & Package
MAX680CPA uses an 8-pin plastic DIP package (0.300" wide) with through-hole mounting and standard JEDEC MO-001AC outline. Pin 1 is bottom-left corner when notch faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (C1+) | Positive Pump Capacitor Top Plate | Connects to positive terminal of C1; alternately charged to VCC and lifted to V+ during pumping cycle |
| 2 (C1−) | Positive Pump Capacitor Bottom Plate | Connects to VCC during charging phase; tied to GND during transfer phase |
| 3 (C2+) | Negative Pump Capacitor Top Plate | Connects to positive terminal of C2; charged from V+ during second half-cycle |
| 4 (C2−) | Negative Pump Capacitor Bottom Plate | Connects to GND during charging; transfers charge to C4 to generate V− |
| 5 (GND) | Analog Ground Reference | Common return for all capacitors and load currents; must be low-impedance star point |
| 6 (V−) | Negative Output Terminal | Delivers inverted output; voltage collapses as IL− increases due to ~90Ω source resistance |
| 7 (V+) | Positive Output Terminal | Delivers doubled output; supplies both external load and negative pump current |
| 8 (VCC) | Positive Input Supply | Accepts +2V to +6V; internally clamped to 6.2V by zener diode |
Key Features
| Feature | Design Value |
|---|---|
| Dual Independent Charge Pumps | Enables simultaneous ±10V generation from one supply without magnetic components or LDOs |
| No Internal Capacitors | Allows full flexibility in capacitor selection (electrolytic, tantalum, ceramic) and value optimization for ripple vs. size trade-offs |
| On-Chip 8kHz Oscillator | Eliminates external timing components; fixed frequency simplifies EMI filtering and capacitor sizing |
| Low Quiescent Current | 1mA typical supply draw enables >1-year battery life in 3V handheld instruments drawing <100µA average load |
| Monolithic CMOS Construction | Ensures process-matched switch characteristics and stable 8kHz clock across temperature and voltage |
Applications
| ±10V from +5V Logic Supply | ±6V from 3V Lithium Cell |
|---|---|
Use Scenario: Powering op-amps and data-acquisition front-ends in industrial PLC I/O modules where only a +5V logic rail is available. IC Role / Device Role / Timing Role: Dual rail generator providing symmetrical analog supply rails without transformers or inductors. Use Value: Enables ±10V dynamic range for 12-bit ADC drivers while maintaining layout simplicity and low BOM cost. | Use Scenario: Portable multimeters and handheld oscilloscopes powered by a single CR2032 coin cell. IC Role / Device Role / Timing Role: Primary DC/DC converter generating bipolar rails directly from 3V battery, feeding downstream LDOs like MAX666/MAX664. Use Value: Achieves regulated ±5V at 5mA with <500µA total quiescent current, extending battery life beyond 500 hours. |
| Operational Amplifier Power Supplies | Battery-Operated Equipment |
Use Scenario: Biasing precision instrumentation amplifiers (e.g., MAX4208) in medical sensor signal chains requiring low-noise ±10V rails. IC Role / Device Role / Timing Role: High-efficiency charge-pump source delivering stable V+/V− despite varying load transients from amplifier output slewing. Use Value: Maintains >90dB PSRR at 1kHz due to low output impedance and absence of switching noise coupling into analog ground. | Use Scenario: Power management in portable gas analyzers using electrochemical sensors needing ±10V bias voltage. IC Role / Device Role / Timing Role: Compact, capacitor-based voltage inverter eliminating need for bulky inductive DC/DC converters in space-constrained enclosures. Use Value: Reduces PCB area by >40% compared to inductor-based solutions while meeting IEC 61000-4-2 ESD immunity requirements. |
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 (C1/C2) and 2.2µF (C3/C4) capacitors; 14-pin DIP; same 8kHz oscillator and ±10V output capability | Reduces external component count to zero but increases package footprint and limits capacitor customization | Select MAX681CPD when board space allows larger DIP and design prioritizes BOM reduction over capacitor optimization |
| MAX864CPA | 200kHz switching frequency; requires smaller 1µF pump capacitors; higher efficiency at light loads; same 8-pin DIP package | Generates lower output ripple and supports higher output current density but demands tighter layout for EMI control | Select MAX864CPA when upgrading legacy MAX680CPA designs for improved ripple performance and reduced capacitor size |
Compared with MAX680CPA, MAX681CPD eliminates external capacitors at the cost of fixed capacitance values and larger footprint, while MAX864CPA improves switching speed and ripple at the expense of increased sensitivity to PCB parasitics and higher gate-drive losses.
Availability
MAX680CPA is available at Aetrix Electronics and suitable for industrial data-acquisition systems, handheld test equipment, and operational amplifier power supplies requiring stable component supply across extended temperature ranges and long production 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/MAX681 product line was engineered specifically for compact, inductorless generation of bipolar supply rails in battery-powered and space-constrained analog systems.
FAQ
What is the maximum continuous output current per rail for the MAX680CPA?
The MAX680CPA delivers up to 10mA from V+ and 10mA from V− under typical conditions (VCC = +5V, TA = +25°C). However, V− current draw loads the V+ rail, so combined output capability is limited by V+ droop: at 10mA each, V+ drops ~3V (150Ω × 20mA), reducing V− headroom and limiting practical simultaneous load to ~7mA per rail.
Can the MAX680CPA operate from a 3V lithium battery?
Yes, the MAX680CPA operates from +2V to +6V, making it fully compatible with 3V lithium cells. At VCC = 3V, it generates approximately ±6V (not ±10V), matching the "±6V from 3V Lithium Cell" application cited in the datasheet, with output source resistance increasing slightly versus +5V operation.
What capacitor values are recommended for stable operation of the MAX680CPA?
For general-purpose use, 4.7µF–10µF polarized electrolytic capacitors are recommended: C1/C2 (pump) and C3/C4 (reservoir). At 5mA load, 10µF reservoirs yield ~30mVpp ripple; for lower ripple, increase C3/C4 to 22µF or 100µF. All capacitors must meet voltage ratings: C1/C3 ≥6V, C2/C4 ≥12V.
How does temperature affect the output source resistance of the MAX680CPA?
Over 0°C to +70°C, the MAX680CPA's positive output source resistance rises from 150Ω to 325Ω, and negative resistance rises from 90Ω to 200Ω. This causes greater voltage droop at elevated temperatures-e.g., at +70°C and 5mA load, V+ drops ~1.6V versus ~0.75V at +25°C-requiring derating in thermally demanding environments.
Is the MAX680CPA pin-compatible with the MAX680CSA or MAX680EPA?
Yes, the MAX680CPA shares identical pinout and electrical specifications with MAX680CSA (8-pin narrow SO) and MAX680EPA (8-pin plastic DIP, −40°C to +85°C), differing only in package type and temperature grade. All three use the same 8-pin DIP/SO footprint and terminal assignments, enabling direct substitution in existing layouts when thermal or packaging requirements change.
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:
- Obsolete
- 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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