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MAX1680 Datasheet

Part Number MAX1680
Manufacturers Maxim
Logo Maxim
Description Switched-Capacitor Voltage Converters
Datasheet MAX1680 DatasheetMAX1680 Datasheet (PDF)

19-1247; Rev 0; 7/97 125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters _______________General 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 repl.

  MAX1680   MAX1680






Part Number MAX1688
Manufacturers Maxim Integrated
Logo Maxim Integrated
Description Step-Up DC-DC Converters
Datasheet MAX1680 DatasheetMAX1688 Datasheet (PDF)

19-1426; Rev 0; 2/99 EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL Step-Up DC-DC Converters with Precise, Adaptive Current Limit for GSM MAX1687 /MAX1688† General Description The MAX1687/MAX1688 step-up DC-DC converters deliver up to 2W from a single Li-Ion or three NiMH cells. The devices are ideal for burst-load applications such as GSM cell phones and wireless LANs, where the RF power amplifiers require short, high current bursts. The MAX1687/MAX1688 reduce battery surge current by slowly charging.

  MAX1680   MAX1680







Part Number MAX1687
Manufacturers Maxim Integrated
Logo Maxim Integrated
Description Step-Up DC-DC Converters
Datasheet MAX1680 DatasheetMAX1687 Datasheet (PDF)

19-1426; Rev 0; 2/99 EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL Step-Up DC-DC Converters with Precise, Adaptive Current Limit for GSM MAX1687 /MAX1688† General Description The MAX1687/MAX1688 step-up DC-DC converters deliver up to 2W from a single Li-Ion or three NiMH cells. The devices are ideal for burst-load applications such as GSM cell phones and wireless LANs, where the RF power amplifiers require short, high current bursts. The MAX1687/MAX1688 reduce battery surge current by slowly charging.

  MAX1680   MAX1680







Part Number MAX1686H
Manufacturers Maxim Integrated
Logo Maxim Integrated
Description Charge Pumps
Datasheet MAX1680 DatasheetMAX1686H Datasheet (PDF)

MAX1686/MAX1686H 19-1376; Rev 1; 12/98 3V to 5V Regulating Charge Pumps for SIM Cards General Description The MAX1686 provides power for dual-voltage subscriber ID module (SIM) cards in portable applications such as GSM cellular phones. Designed to reside in the portable unit (cellular phone handset), the 1MHz charge pump converts a 2.7V to 4.2V input to regulated 5V output. The MAX1686H has a nominal output voltage of 5.0V, while the MAX1686 is set to 4.75V to reduce SIMcard current drain. T.

  MAX1680   MAX1680







Part Number MAX1686
Manufacturers Maxim
Logo Maxim
Description Charge Pumps
Datasheet MAX1680 DatasheetMAX1686 Datasheet (PDF)

19-1426; Rev 0; 2/99 NUAL KIT MA ATION EET H S A EVALU T WS DA FOLLO Step-Up DC-DC Converters with Precise, Adaptive Current Limit for GSM General Description Features o Low 450mA Peak Battery Current Provides 2A, 5V GSM Burst o 90% Efficiency o Internal Power MOSFETs and Current-Sense Resistor o Output Disconnects from Input During Shutdown o 3µA Shutdown Current o Precise Voltage-Controlled Current Limit (MAX1687) o Adaptive Constant-Recharge-Time Capability (MAX1688) o 1.25V to 6V Adjustabl.

  MAX1680   MAX1680







Part Number MAX1685
Manufacturers Maxim
Logo Maxim
Description Low-Noise / 14V Input / 1A / PWM Step-Down Converters
Datasheet MAX1680 DatasheetMAX1685 Datasheet (PDF)

19-1454; Rev 0; 4/99 L MANUA ION KIT HEET T A U L EVA TA S WS DA FOLLO Low-Noise, 14V Input, 1A, PWM Step-Down Converters Features o Up to 96% Efficiency o 1A Guaranteed Output Current o 100% Duty Cycle in Dropout o 2.7V to 14V Input Range (15V absolute max) o ±1% Accurate Reference Output o 0.24Ω P-Channel On-Resistance o Synchronizable Switching Frequency o Fixed-Frequency PWM Operation 300kHz (MAX1684) 600kHz (MAX1685) o 150µA Normal Mode Quiescent Current o 25µA Low-Power Mode Quiescent Cu.

  MAX1680   MAX1680







Switched-Capacitor Voltage Converters

19-1247; Rev 0; 7/97 125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters _______________General 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. ____________________________Features o Selectable Switching Frequencies: 125kHz/250kHz (MAX1680) 500kHz/1MHz (MAX1681) o Allow Use of Small Capacitors (1µF for the MAX1681) o 125mA Output Current o 3.5Ω Output Impedance o 1µA Logic-Controlled Shutdown o Configurable as Voltage Inverters or Doublers o +2.0V to +5.5V Input Voltage Range o Available in 8-Pin SO Packages o 90% Efficiency MAX1680/MAX1681 ________________________Applications Local Negative Supplies Interface Power Supplies Op-Amp Power Supplies MOSFET Bias _____________.


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