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Data Sheet

FULL DATA SHEET (PDF, 112kB) Download   E-Mail

Description

The MAX1680/MAX1681 inductorless switched-capacitor voltage converters either invert an input voltage of +2.0V to +5.5V or double it while supplying up to 125mA output current. They have a selectable-frequency option that allows the use of small capacitors: 4.7µF (MAX1680), 1µF (MAX1681). With their high output current capability, these charge-pump devices are suitable replacements for inductor-based regulators, which require more expensive external components and additional board space. The devices' equivalent output resistance (typically 3.5Ω) allows them to deliver as much as 125mA with only a 440mV drop. A shutdown feature reduces quiescent current to less than 1µA. The MAX1680/MAX1681 are available in 8-pin SO packages. For devices that deliver up to 50mA in smaller µMAX® packages, refer to the MAX860/MAX861 data sheet.

Key Features		Applications/Uses
Selectable Switching Frequencies: 125kHz/250kHz (MAX1680) 500kHz/1MHz (MAX1681) Allow Use of Small Capacitors (1µF for the MAX1681) 125mA Output Current 3.5Ω Output Impedance 1µA Logic-Controlled Shutdown Configurable as Voltage Inverters or Doublers +2.0V to +5.5V Input Voltage Range Available in 8-Pin SO Packages 90% Efficiency		Interface Power Supplies Local Negative Supplies MOSFET Bias Op-Amp Power Supplies

Diagram

Typical Operating Circuit

Application Notes

Application Note 718: Properties of the Charge-Pump Voltage Splitter - MAX1681 Application Note 725: DC/DC Conversion without Inductors - MAX1680, MAX1681 Application Note 782: Charge Pump Doubles Negative Voltage - MAX1681 Application Note 1876: Doubler/Inverter Charge Pumps Divide by Two - MAX1680, MAX1681 Application Note 2025: Relay Driver Requires Only 25% Power - MAX1681 Application Note 3534: Charge Pump Converts -5V to +5V - MAX1681

Evaluation Kits

none

Reliability Reports

Show FIT data for: MAX1680 MAX1681 Request Reliability Report for: MAX1680 MAX1681

Software/Models

none

Ordering Information
Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices: 1-10 of 10
MAX1680	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1680C/D			DICE SALES; Use pkgcode/variation: DICE*		See data sheet
MAX1680ESA+			SOIC;8 pin; Dwg: 21-0041B (PDF) Use pkgcode/variation: S8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1680ESA+T			SOIC;8 pin; Dwg: 21-0041B (PDF) Use pkgcode/variation: S8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1680ESA-T			SOIC;8 pin; Dwg: 21-0041B (PDF) Use pkgcode/variation: S8-5*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1680ESA			SOIC;8 pin; Dwg: 21-0041B (PDF) Use pkgcode/variation: S8-5*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1681	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1681C/D			DICE SALES; Use pkgcode/variation: DICE*		See data sheet
MAX1681ESA			SOIC;8 pin; Dwg: 21-0041B (PDF) Use pkgcode/variation: S8-5*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1681ESA+			SOIC;8 pin; Dwg: 21-0041B (PDF) Use pkgcode/variation: S8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1681ESA+T			SOIC;8 pin; Dwg: 21-0041B (PDF) Use pkgcode/variation: S8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1681ESA-T			SOIC;8 pin; Dwg: 21-0041B (PDF) Use pkgcode/variation: S8-5*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis

Related Products

MAX860, MAX861 50mA, Frequency-Selectable, Switched-Capacitor Voltage Converters

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