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Analog Devices Inc./Maxim Integrated MAX680ESA+T
- Part No.:
- MAX680ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX680ESA+T.pdf
- Description:
- IC REG CHARGE PUMP 2VIN DL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,107
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Product details
Overview
The MAX680ESA+T from Maxim Integrated is a monolithic CMOS dual charge-pump voltage converter that generates ±10V outputs from a single +5V input supply. It requires four external capacitors, delivers up to 10mA output current per rail, exhibits 150Ω typical positive output source resistance and 90Ω negative output source resistance at +25°C, and operates across -40°C to +85°C for use in analog power supplies and portable instrumentation.
For engineers reviewing the MAX680ESA+T datasheet, MAX680ESA+T pinout, MAX680ESA+T application, or MAX680ESA+T equivalent, this device is selected for compact dual-rail generation where internal capacitors are not required, temperature-stable ±10V operation is needed from 5V logic rails, and low quiescent current (≤3mA over full temp range) supports battery-powered systems.
Technical Context
The MAX680ESA+T 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 uses external C1/C3; the negative pump uses external C2/C4 - no internal capacitance is integrated.
It is not a regulated device: output voltages droop linearly with load due to fixed source impedances (150Ω/90Ω typ), requiring external regulation for precision rails. Output ripple is governed by reservoir capacitor value and load current per the formula VRIPPLE = ½·IOUT·(1/8kHz)·(1/CR).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +2.0V to +6.0V - supports 3V battery and 5V logic rails without level-shifting |
| Positive Output (V+) | +10V (no load), drops ~1.5V at 10mA due to 150Ω source resistance |
| Negative Output (V−) | −10V (no load), drops ~0.9V at 10mA due to 90Ω source resistance |
| Oscillator Frequency | 8kHz fixed - determines ripple frequency and minimum reservoir capacitor sizing |
| Supply Current | ≤3mA over −40°C to +85°C - enables multi-day operation from coin cells |
| Power Efficiency | 85% typ at RL = 10kΩ - reduces thermal load in sealed enclosures |
| Voltage-Conversion Efficiency | 95% typ for V+ - preserves input energy when sourcing light loads |
Pinout & Package
MAX680ESA+T is housed in an 8-pin narrow SO package (SOIC-8, 150mil width), RoHS-compliant, with standard gull-wing leads and 1.27mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (C1+) | Positive pump capacitor top plate | Connects to positive terminal of C1; forms flying capacitor node for voltage doubling |
| 2 (C1−) | Positive pump capacitor bottom plate | Connects to ground or VCC depending on phase; completes charge-transfer path for V+ |
| 3 (C2+) | Negative pump capacitor top plate | Connects to V+ rail; serves as flying node for inverting conversion to V− |
| 4 (C2−) | Negative pump capacitor bottom plate | Connects to ground; completes charge-transfer loop for V− generation |
| 5 (GND) | Analog ground reference | Common return for all capacitors and load currents; must be low-impedance |
| 6 (V−) | Negative output terminal | Delivers regulated-negative rail after external filtering; sourced from C4 |
| 7 (V+) | Positive output terminal | Delivers doubled-positive rail after external filtering; sourced from C3 |
| 8 (VCC) | Input supply pin | 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 without cross-regulation coupling between rails |
| Fixed 8kHz oscillator | Eliminates external timing components while enabling predictable ripple filtering design |
| Low quiescent current (≤3mA) | Extends battery life in handheld meters and portable DAQ systems operating at −40°C to +85°C |
| 150Ω/90Ω output source resistances | Allows accurate load droop prediction using Ohm's Law - critical for unregulated analog supply design |
| Monolithic CMOS construction | Ensures stable performance across temperature without discrete MOSFET matching drift |
Applications
| ±10V Analog Power Supply | Hand-Held Instrumentation |
|---|---|
Use Scenario: Providing symmetrical supply rails for op-amps and ADC drivers in benchtop test equipment powered from +5V logic rails. IC Role / Device Role / Timing Role: Dual-rail DC/DC converter generating unregulated ±10V from single 5V input; no clock interface required. Use Value: Eliminates need for dual-input transformers or isolated DC/DC modules - reduces BOM cost and PCB area by >40%. | Use Scenario: Powering LCD bias and signal conditioning circuitry in portable multimeters running from a single 3V lithium cell. IC Role / Device Role / Timing Role: Compact voltage doubler/inverter delivering ±6V from 3V input; operates across full industrial temperature range. Use Value: Enables true bipolar analog front-end operation while maintaining <500µA system standby current. |
| Data Acquisition Systems | Panel Meters |
Use Scenario: Supplying ±10V rails to 16-bit SAR ADCs and programmable gain instrumentation amplifiers in modular DAQ modules. IC Role / Device Role / Timing Role: High-efficiency charge-pump converter with predictable output impedance for precision analog signal chain biasing. Use Value: Supports 16-bit linearity by limiting output droop to <10mV under 1mA load - verified via source resistance spec. | Use Scenario: Generating dual supply rails for LED driver ICs and microcontroller peripherals in DIN-rail mounted industrial panel meters. IC Role / Device Role / Timing Role: Robust dual-output converter rated for −40°C to +85°C operation with no derating required. Use Value: Ensures reliable startup and sustained operation during cold ambient exposure without capacitor derating concerns. |
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 |
|---|---|---|---|
| MAX681ESA+ | Integrates 1.5µF (C1/C2) and 2.2µF (C3/C4) capacitors; eliminates all external caps; same pinout but different internal routing | Reduces component count and layout sensitivity; unsuitable where capacitor value tuning is required | Select MAX681ESA+ when board space is constrained and fixed 8kHz operation with integrated caps is acceptable |
| MAX864ESA+ | Operates at 200kHz; supports smaller 1µF–2.2µF external capacitors; higher efficiency at light loads | Better suited for high-density portable designs needing lower ripple and faster transient response | Select MAX864ESA+ when reducing output ripple below 10mVpp or minimizing capacitor footprint is critical |
Compared with MAX680ESA+T, the MAX681ESA+ removes external capacitor dependencies but sacrifices tuning flexibility, while the MAX864ESA+ improves dynamic performance and size efficiency at the cost of higher EMI susceptibility and tighter layout requirements.
Availability
MAX680ESA+T is available at Aetrix Electronics and suitable for analog power supplies, hand-held instrumentation, and data-acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX680ESA+T 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, low-quiescent-current dual charge-pump converters for generating bipolar rails from single supplies in space- and power-constrained systems.
FAQ
What is the maximum continuous output current supported by the MAX680ESA+T?
The MAX680ESA+T supports up to 10mA from the V+ rail and 10mA from the V− rail simultaneously, assuming VCC = +5V and TA = +25°C. At full load, V+ droops by ~1.5V (150Ω × 10mA) and V− by ~0.9V (90Ω × 10mA). Derating is required at elevated temperatures - at +85°C, total usable current per rail drops to ~7mA due to increased source resistance.
Can the MAX680ESA+T generate ±5V from a 3V input?
Yes - the MAX680ESA+T accepts +2V to +6V input and produces ±2×VCC. With 3V input, it delivers approximately ±6V open-circuit. To achieve stable ±5V, pair the MAX680ESA+T with post-regulators like the MAX666 (for +5V) and MAX664 (for −5V), as documented in Figure 5 of the datasheet. The MAX680ESA+T itself is unregulated and cannot hold exact ±5V under varying loads.
What capacitor values are recommended for the MAX680ESA+T in a ±10V, 5mA application?
For a ±10V, 5mA application with VCC = +5V, use 4.7µF polarized electrolytic capacitors for C1 and C2 (charge-pump), and 10µF for C3 and C4 (reservoir). All capacitors must be rated ≥6V (C1/C3) and ≥12V (C2/C4). This configuration yields ~20mVpp ripple at 5mA load and maintains <2% droop on both rails - consistent with the MAX680ESA+T's specified source impedances.
Does the MAX680ESA+T require external clocking or control signals?
No - the MAX680ESA+T contains a fully integrated 8kHz oscillator and requires no external clock, enable, or sync signals. It begins operating immediately upon application of VCC within its +2V to +6V range. There is no shutdown pin or frequency adjustment capability; operation is autonomous and deterministic once powered.
How does temperature affect the output performance of the MAX680ESA+T?
Over −40°C to +85°C, the MAX680ESA+T's positive output source resistance increases from 150Ω to 350Ω and negative resistance from 90Ω to 200Ω. This causes greater voltage droop under load: at 10mA and +85°C, V+ drops ~3.5V and V− drops ~2.0V. Supply current also rises from 1mA (25°C) to 3mA (85°C), impacting battery runtime in portable designs.
MAX680ESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX680ESA+T FAQ
1.How can I place an order for MAX680ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX680ESA+T 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 MAX680ESA+T reliable?
The price and inventory of MAX680ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX680ESA+T is usually 5 days.
3.What payment methods are accepted for MAX680ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX680ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX680ESA+T?
MAX680ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX680ESA+T 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 MAX680ESA+T?
For technical support, including MAX680ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX680ESA+T requirements.
6.How does Aetrix verify that MAX680ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX680ESA+T 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 MAX680ESA+T meets industry standards.
7.What is the process for return or replacement of MAX680ESA+T?
All MAX680ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX680ESA+T, 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 MAX680ESA+T part is unused and in its original packaging.
Return procedure for MAX680ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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