DatasheetsPDF.com

MAX1649

Maxim
Part Number MAX1649
Manufacturer Maxim
Description Step-Down DC-DC Controllers
Published May 6, 2005
Detailed Description 19-0305; Rev 2; 9/95 5V/3.3V or Adjustable, High-Efficiency, Low-Dropout, Step-Down DC-DC Controllers _______________Ge...
Datasheet PDF File MAX1649 PDF File

MAX1649
MAX1649

Overview
19-0305; Rev 2; 9/95 5V/3.
3V or Adjustable, High-Efficiency, Low-Dropout, Step-Down DC-DC Controllers _______________General Description The MAX1649/MAX1651 BiCMOS, step-down, DC-DC switching controllers provide high efficiency over loads ranging from 1mA to more than 2.
5A.
A unique, currentlimited pulse-frequency-modulated (PFM) control scheme gives these devices the benefits of pulse-width-modulation (PWM) converters (high efficiency at heavy loads), while using only 100µA of supply current (vs.
2mA to 10mA for PWM converters).
Dropout performance down to 300mV is provided by a high switch duty cycle (96.
5%) and a low current-sense threshold (110mV).
A high switching frequency (up to 300kHz) allows these devices to use miniature external components.
The MAX1649/MAX1651 have dropout voltages less than 0.
3V at 500mA and accept input voltages up to 16V.
Output voltages are preset at 5V (MAX1649), or 3.
3V (MAX1651).
They can also be adjusted to any voltage from 1.
5V to the input voltage by using two resistors.
These step-down controllers drive external P-channel MOSFETs at loads greater than 12.
5W.
If less power is required, use the MAX639/MAX640/MAX653 step-down converters with on-chip FETs, which allow up to a 225mA load current.
____________________________Features o o o o o o o More than 90% Efficiency (10mA to 1.
5A Loads) More than 12.
5W Output Power Less than 0.
3V Dropout Voltage at 500mA 100µA Max Quiescent Supply Current 5µA Max Shutdown Supply Current 16V Max Input Voltage 5V (MAX1649), 3.
3V (MAX1651), or Adjustable Output Voltage o Current-Limited Control Scheme o Up to 300kHz Switching Frequency o Up to 96.
5% Duty Cycle MAX1649/MAX1651 ______________Ordering Information PART MAX1649CPA MAX1649CSA MAX1649C/D MAX1649EPA MAX1649ESA MAX1651CPA MAX1651CSA MAX1651C/D MAX1651EPA MAX1651ESA TEMP.
RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C 0°C to +70°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C PIN-PACKAGE 8 Plastic D...


Similar Datasheet


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site. (Privacy Policy & Contact)