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Analog Devices Inc./Maxim Integrated MAX1680ESA+
- Part No.:
- MAX1680ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1680ESA+.pdf
- Description:
- IC REG CHRG PUMP INV 125MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:756
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Product details
Overview
MAX1680ESA+ from Maxim Integrated is a frequency-selectable, inductorless switched-capacitor voltage inverter/doubler IC delivering up to 125mA output current with 3.5Ω typical output resistance. It operates from +2.0V to +5.5V input and supports dual switching frequencies (125kHz/250kHz) for optimized capacitor sizing and noise management. It serves as a compact, high-current replacement for inductor-based regulators in op-amp biasing and interface power supplies.
For engineers reviewing the MAX1680ESA+ datasheet, MAX1680ESA+ pinout, MAX1680ESA+ application, or MAX1680ESA+ equivalent, key selection criteria include its 8-pin SO package, logic-controlled shutdown (<1µA quiescent), configurable inverter/doubler topology, and verified 90% efficiency at full load - all critical for space-constrained, low-noise analog subsystems.
Technical Context
The MAX1680ESA+ implements a charge-pump architecture with internal MOSFET switches and no external inductor. Its dual-frequency operation (125kHz/250kHz) is controlled by the FSEL pin, directly setting oscillator frequency without internal division. The device's low 3.5Ω output resistance enables stable voltage inversion or doubling under dynamic loads up to 125mA.
In shutdown mode (SHDN = high), the charge pump disables and OUT pulls to ground in inverter configuration; shutdown is not functional in doubler mode. LV pin must be tied to GND for inverter use or to OUT for doubler use - this pin defines topology and affects minimum input voltage requirements (+2.0V–+5.5V for inverter, +2.5V–+5.5V for doubler).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +2.0V to +5.5V (inverter); +2.5V to +5.5V (doubler) - defines minimum supply headroom for stable operation |
| Output Current | 125mA max - supports higher-current analog rails than legacy charge pumps like MAX660 or MAX860 |
| Switching Frequencies | 125kHz (FSEL = high) / 250kHz (FSEL = low) - enables trade-off between capacitor size (4.7µF) and supply current |
| Output Resistance | 3.5Ω typical - yields only 440mV drop at 125mA load, enabling predictable voltage regulation without feedback |
| Shutdown Current | <1µA - ensures ultra-low power state for battery-sensitive systems when inactive |
| Power Efficiency | 90% typical (inverter, 5V input, 125mA) - reduces thermal load and extends battery life vs. linear regulators |
| Package | 8-pin SO (SOIC) - industry-standard footprint compatible with automated assembly and thermal relief design |
Pinout & Package
MAX1680ESA+ is housed in an 8-pin SO (SOIC) package with standard 1.27mm pitch, JEDEC MS-012AC compliant, suitable for reflow soldering and IPC Class 2/3 assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FSEL (Pin 1) | Frequency select input | CMOS-level control: high = 125kHz, low = 250kHz - sets switching speed to optimize capacitor ESR and board area |
| CAP+ (Pin 2) | Positive charge-pump capacitor node | Connects to positive terminal of flying capacitor C1 - critical path for charge transfer; requires low-ESR ceramic |
| GND (Pin 3) | Power ground reference | Primary return path for input, output, and internal switch currents - must be low-impedance plane |
| CAP− (Pin 4) | Negative charge-pump capacitor node | Connects to negative terminal of flying capacitor C1 - forms charge-transfer loop with CAP+ |
| OUT (Pin 5) | Negative voltage output (inverter) or doubled positive output (doubler) | Delivers regulated-inversion (-VIN) or doubling (2×VIN); sinks current in shutdown (inverter mode only) |
| LV (Pin 6) | Topology configuration input | Tie to GND for inverter; tie to OUT for doubler - selects internal switch routing and adjusts input range |
| SHDN (Pin 7) | Logic-controlled shutdown enable | High = disable charge pump (<1µA IQ); low = active - CMOS-compatible, no pull-up required |
| IN (Pin 8) | Positive input voltage supply | Accepts +2.0V to +5.5V; powers internal circuitry and charge pump - requires local 4.7µF bypass |
Key Features
| Feature | Design Value |
|---|---|
| Configurable topology | Single IC supports both voltage inversion and doubling via LV pin connection - eliminates need for separate part numbers |
| Low-output-impedance design | 3.5Ω typical output resistance enables ≤440mV drop at 125mA - delivers stable rail voltage without closed-loop regulation |
| Frequency-selectable operation | 125kHz/250kHz options allow optimization of 4.7µF capacitor size vs. supply current - reduces BOM cost and PCB area |
| Ultra-low shutdown current | <1µA quiescent draw in SHDN = high state - extends battery life in portable instrumentation and sensor nodes |
| Robust absolute ratings | IN withstands −0.3V to +6V; OUT handles −6V to +0.3V - tolerates transient overvoltage and reverse polarity during hot-swap |
Applications
| Local Negative Supplies | Interface Power Supplies |
|---|---|
|
Use Scenario: Generating −3V or −5V rails for RS-232 transceivers, LCD bias, or op-amp dual-supply operation in embedded controllers. IC Role / Device Role / Timing Role: Voltage inverter providing clean, low-noise negative supply referenced to system ground. Use Value: Eliminates bulky inductors and simplifies layout while sustaining 125mA - sufficient for multi-channel RS-232 drivers. |
Use Scenario: Powering isolated USB PHYs, CAN transceivers, or level-shifting interfaces requiring ±5V or ±3.3V rails. IC Role / Device Role / Timing Role: Compact, low-ESR charge-pump converter delivering stable inverted/doubled voltage with minimal ripple. Use Value: 90% efficiency and 440mV drop at full load ensure reliable interface operation without thermal derating. |
| Op-Amp Power Supplies | MOSFET Bias |
|
Use Scenario: Supplying dual-rail ±5V or ±3.3V to precision op-amps in data acquisition front-ends and sensor signal conditioning. IC Role / Device Role / Timing Role: Low-noise, low-impedance inverter generating negative rail synchronized to positive supply. Use Value: 3.5Ω output resistance minimizes load-induced voltage sag - preserves op-amp common-mode range and PSRR. |
Use Scenario: Providing gate bias voltage for high-side N-channel MOSFETs in DC-DC synchronous rectifiers or motor drivers. IC Role / Device Role / Timing Role: Doubler configured to generate 2×VIN for enhanced gate drive margin above source potential. Use Value: Supports fast switching with 125mA peak current - ensures rapid MOSFET turn-on even under heavy capacitive loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor voltage converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1681ESA+ | Higher switching frequencies (500kHz/1MHz); uses 1µF capacitors instead of 4.7µF; same 125mA rating and 3.5Ω ROUT | Better suited for ultra-compact layouts and lower EMI; requires tighter capacitor tolerance due to higher fOSC | Select MAX1681ESA+ when board space is constrained and 1µF low-ESR ceramics are preferred over 4.7µF. |
| MAX860ESA+ | Lower output current (50mA); same SO-8 package; no shutdown pin; fixed 125kHz frequency; requires larger 10µF capacitors | Targeted at low-power analog rails where 125mA capability is unnecessary - simpler control but less flexible | Choose MAX860ESA+ only for cost-sensitive, low-current designs where frequency selection and shutdown are not required. |
Compared with MAX1681ESA+, MAX1680ESA+ trades higher capacitor size (4.7µF) for lower supply current and reduced EMI sensitivity; versus MAX860ESA+, it delivers 2.5× more output current and adds shutdown/frequency control - making it optimal for mid-power analog subsystems demanding flexibility and robustness.
Availability
MAX1680ESA+ is available at Aetrix Electronics and suitable for local negative supplies, interface power supplies, and op-amp power supplies requiring stable component supply across industrial, medical, and test equipment programs.
Supply support for MAX1680ESA+ 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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications.
The MAX1680/MAX1681 product line was designed to replace inductor-based regulators in space-constrained analog subsystems - delivering high-current, low-noise voltage inversion and doubling without magnetic components.
FAQ
What is the maximum continuous output current of the MAX1680ESA+?
The MAX1680ESA+ delivers up to 125mA continuous output current in both inverter and doubler configurations. This is verified across the full operating temperature range (−40°C to +85°C) and supported by its 3.5Ω typical output resistance, which limits voltage drop to 440mV at full load. Absolute maximum rating is 135mA, but sustained operation above 125mA may reduce reliability or efficiency.
How does the FSEL pin configure switching frequency on the MAX1680ESA+?
On the MAX1680ESA+, the FSEL pin selects between two fixed switching frequencies: 125kHz when pulled high (to IN or LV), and 250kHz when pulled low (to GND). This direct CMOS-level control allows designers to optimize external capacitor size (4.7µF nominal) and supply current - lower frequency reduces IQ, higher frequency shrinks capacitor footprint and EMI bandwidth.
Can the MAX1680ESA+ be used in voltage doubler mode, and what are the input voltage constraints?
Yes, the MAX1680ESA+ supports voltage doubling by connecting the LV pin to OUT. In this configuration, the input voltage range narrows to +2.5V to +5.5V (vs. +2.0V to +5.5V in inverter mode), and output is approximately 2×VIN under light load. Load regulation remains consistent - 125mA output is achievable with ≤440mV drop - but efficiency drops slightly compared to inverter mode at identical conditions.
What happens to the OUT pin during shutdown on the MAX1680ESA+?
When SHDN is driven high, the MAX1680ESA+ enters shutdown mode and draws <1µA supply current. In inverter configuration (LV = GND), the OUT pin actively pulls to GND. In doubler configuration (LV = OUT), shutdown is not functional - SHDN must be tied to OUT to maintain operation, and no shutdown state is available. This behavior is inherent to the internal switch topology.
Is the MAX1680ESA+ pin-compatible with the MAX860ESA+ or MAX660?
No, the MAX1680ESA+ is not pin-compatible with MAX860ESA+ or MAX660. While all three are charge-pump inverters in SO-8 packages, pin functions differ: MAX1680ESA+ uses Pin 1 for FSEL and Pin 6 for LV, whereas MAX860ESA+ uses Pin 1 for IN and Pin 6 for GND; MAX660 uses Pin 1 for OSC and Pin 6 for COMP. Direct replacement requires PCB redesign and updated capacitor values.
MAX1680ESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Ratiometric
- Output Configuration:
- Positive or Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 125mA
- Frequency - Switching:
- 125kHz, 250kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX1680ESA+ FAQ
1.How can I place an order for MAX1680ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1680ESA+ 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 MAX1680ESA+ reliable?
The price and inventory of MAX1680ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1680ESA+ is usually 5 days.
3.What payment methods are accepted for MAX1680ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1680ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1680ESA+?
MAX1680ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1680ESA+ 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 MAX1680ESA+?
For technical support, including MAX1680ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1680ESA+ requirements.
6.How does Aetrix verify that MAX1680ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX1680ESA+ 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 MAX1680ESA+ meets industry standards.
7.What is the process for return or replacement of MAX1680ESA+?
All MAX1680ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1680ESA+, 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 MAX1680ESA+ part is unused and in its original packaging.
Return procedure for MAX1680ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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