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Analog Devices Inc./Maxim Integrated MAX680EPA+
- Part No.:
- MAX680EPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX680EPA+.pdf
- Description:
- IC REG CHARGE PUMP 2VIN DL 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,274
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Product details
Overview
The MAX680EPA+ from Maxim Integrated is a monolithic CMOS dual charge-pump voltage converter that generates ±10V outputs from a single +5V input, with ±150Ω typical output source impedance at 25°C and -40°C to +85°C operating temperature range in an 8-pin plastic DIP package. It requires four external capacitors and delivers up to 10mA per rail for analog power supply generation in space-constrained industrial instrumentation.
For engineers reviewing the MAX680EPA+ datasheet, MAX680EPA+ pinout, MAX680EPA+ application, or MAX680EPA+ equivalent, this device is selected for bipolar supply generation where low quiescent current (≤3mA over full temp range), fixed 8kHz oscillator frequency, and discrete capacitor flexibility are critical - especially when internal capacitors (as in MAX681) are not required.
Technical Context
The MAX680EPA+ implements two independent switched-capacitor stages: a positive charge pump doubling VCC to V+, and a negative charge pump inverting V+ to V−, with both pumps driven by an on-chip 8kHz oscillator. Its P- and N-channel MOSFET switch array operates with no external timing components.
Output regulation is unregulated; V+ and V− droop linearly with load due to fixed source impedances - 150Ω (TYP) for V+ and 90Ω (TYP) for V− at 25°C - requiring explicit load-dependent voltage drop calculation per datasheet formulas. The device is not a regulator and lacks feedback or error amplifiers.
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 level shifting |
| Output Voltages | ±10V (no-load, VCC = 5V) - nominal doubled output; actual values drop under load per source resistance |
| Oscillator Frequency | 8kHz (fixed, internal) - determines ripple frequency and minimum reservoir capacitor sizing |
| V+ Source Resistance | 150Ω (TYP, 25°C) - sets V+ droop: ΔV = IL+ × 150Ω + IL− × 150Ω |
| V− Source Resistance | 90Ω (TYP, 25°C) - sets V− droop: ΔV = IL− × 90Ω, referenced to V+ |
| Quiescent Current | 3mA (MAX, -40°C to +85°C) - enables low-power operation in battery-backed systems |
| Efficiency | 95% voltage-conversion, 85% power-conversion - reflects minimal switching loss in CMOS topology |
Pinout & Package
MAX680EPA+ is housed in an 8-pin plastic DIP (dual in-line package) with 0.3-inch body width and through-hole mounting. Pin spacing complies with JEDEC MS-001.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (C1+) | Positive pump capacitor top plate | Connects to positive terminal of C1; forms flying capacitor node for V+ generation |
| 2 (C1−) | Positive pump capacitor bottom plate | Connects to ground or VCC during charge phase; referenced to VCC for voltage doubling |
| 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 during charge phase; defines inversion reference for V− |
| 5 (V−) | Negative output | Delivers inverted output; sourced from C4; load current flows into this pin |
| 6 (V+) | Positive output | Delivers doubled output; sourced from C3; supplies both load and negative pump |
| 7 (GND) | Analog ground reference | Common return for all capacitors and internal switches; must be low-impedance |
| 8 (VCC) | Positive input supply | Accepts +2V to +6V; powers oscillator and all switches; clamped to 6.2V internally |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent charge pumps | Enables simultaneous ±10V generation from one supply without shared regulation path |
| No external timing components | 8kHz internal oscillator eliminates need for crystals, RC networks, or clock routing |
| Low quiescent current | ≤3mA across full -40°C to +85°C range supports battery life >1 year in 10µA standby systems |
| CMOS monolithic design | Integrates all switches, oscillator, and control logic - no external drivers or logic needed |
| Wide input voltage support | +2V to +6V operation allows direct use with Li-ion, alkaline, and regulated 5V/3.3V rails |
Applications
| Operational Amplifier Power Supplies | Hand-Held Instruments |
|---|---|
|
Use Scenario: Providing symmetric ±10V rails to precision op-amps in portable test equipment. IC Role / Device Role / Timing Role: Dual charge-pump voltage converter generating unregulated but stable bipolar supplies. Use Value: Eliminates need for dual batteries or transformer-based supplies; maintains 10mA output capability at <3mA quiescent draw. |
Use Scenario: Powering LCD bias, sensor front-ends, and ADC references in handheld multimeters. IC Role / Device Role / Timing Role: Compact bipolar supply generator enabling single-cell 3V operation with ±6V outputs. Use Value: Achieves ±6V from 3V lithium cell using same external capacitor set as ±10V mode - no redesign needed. |
| Data-Acquisition Systems | Panel Meters |
|
Use Scenario: Supplying ±10V to 16-bit SAR ADC drivers and programmable gain amplifiers. IC Role / Device Role / Timing Role: Low-noise, low-ripple auxiliary supply for analog signal chain biasing. Use Value: With 10µF reservoir caps, ripple stays ≤30mVp-p at 5mA - sufficient for 16-bit ENOB. |
Use Scenario: Generating ±10V for analog meter movement drivers and LED segment bias in industrial panel meters. IC Role / Device Role / Timing Role: High-reliability, through-hole mounted voltage converter for long-lifecycle industrial hardware. Use Value: -40°C to +85°C rating ensures stable operation in uncontrolled cabinet environments. |
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 |
|---|---|---|---|
| MAX681EPA+ | Includes internal 1.5µF and 2.2µF capacitors; same pinout but no C1–C4 connections required | Reduces BOM count and PCB area; unsuitable where capacitor value tuning or high-temp electrolytics are needed | Select MAX681EPA+ when minimizing external components is prioritized over capacitor selection flexibility |
| MAX864EPA+ | 200kHz switching frequency; supports smaller 1µF–2.2µF ceramic capacitors; higher efficiency at light loads | Better suited for compact, high-density designs; requires different capacitor type and layout due to higher frequency | Select MAX864EPA+ when board space is constrained and ceramic capacitors are preferred over electrolytics |
Compared with MAX680EPA+, MAX681EPA+ removes external capacitor dependency at the cost of fixed capacitance values, while MAX864EPA+ trades lower-frequency simplicity for higher-frequency efficiency and smaller passive size - making MAX680EPA+ optimal for designs needing adjustable capacitor selection and proven 8kHz noise profile.
Availability
MAX680EPA+ is available at Aetrix Electronics and suitable for operational amplifier power supplies, hand-held instruments, and data-acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX680EPA+ 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 delivers compact, capacitor-based bipolar voltage conversion for analog signal chains where transformerless, low-quiescent solutions are essential.
FAQ
What is the maximum continuous output current supported by the MAX680EPA+?
The MAX680EPA+ delivers up to 10mA from V+ and 10mA from V− simultaneously under typical conditions (VCC = 5V, TA = 25°C). At full load, V+ droops by ~3V and V− by ~1.5V due to source resistance; derating is required for stable ±10V operation. The absolute maximum V+ current is 75mA, but sustained operation above 10mA per rail degrades regulation and efficiency.
Can the MAX680EPA+ operate from a 3V lithium battery?
Yes, the MAX680EPA+ supports input voltages from +2.0V to +6.0V, making it fully compatible with 3V lithium cells. At 3V input, it generates ±6V (not ±10V); output scaling is linear with VCC. Quiescent current remains ≤3mA across the full -40°C to +85°C range, preserving battery life in portable applications.
Does the MAX680EPA+ require external timing components?
No, the MAX680EPA+ integrates an 8kHz oscillator and requires no external resistors, capacitors, or clocks. All timing is self-contained, simplifying layout and eliminating timing-related failure modes. This distinguishes it from adjustable-frequency charge pumps and reduces bill-of-materials count.
How does temperature affect the output source resistance of the MAX680EPA+?
Over -40°C to +85°C, the MAX680EPA+ V+ source resistance increases from 150Ω (TYP, 25°C) to 350Ω (MAX), and V− resistance rises from 90Ω (TYP) to 200Ω (MAX). These shifts directly impact output droop: at 10mA load and 85°C, V+ may drop ~3.5V and V− ~2V - requiring thermal-aware design margining.
Is the MAX680EPA+ pin-compatible with the MAX681EPA+?
No, the MAX680EPA+ and MAX681EPA+ share the same 8-pin DIP footprint but differ electrically at the pin level: MAX681EPA+ repurposes pins 1–4 as internal capacitor terminals and omits external C1–C4 connections. Direct substitution would leave critical nodes floating; PCB layout and schematic must be redesigned for MAX681EPA+.
MAX680EPA+ 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX680EPA+ FAQ
1.How can I place an order for MAX680EPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX680EPA+ 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 MAX680EPA+ reliable?
The price and inventory of MAX680EPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX680EPA+ is usually 5 days.
3.What payment methods are accepted for MAX680EPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX680EPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX680EPA+?
MAX680EPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX680EPA+ 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 MAX680EPA+?
For technical support, including MAX680EPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX680EPA+ requirements.
6.How does Aetrix verify that MAX680EPA+ is sourced from the original manufacturer or authorized distributors?
All MAX680EPA+ 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 MAX680EPA+ meets industry standards.
7.What is the process for return or replacement of MAX680EPA+?
All MAX680EPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX680EPA+, 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 MAX680EPA+ part is unused and in its original packaging.
Return procedure for MAX680EPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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