MAX878L Datasheet | Maxim Integrated

Description The MAX777L/MAX778L/MAX779L are pulse-skipping DC-DC converters that step up from low-voltage inputs (1V guaranteed). They require only three external ponents- an inductor (typically 22µH) and two capacitors. The MAX777L delivers a 5V output, the MAX778L generates pin-selectable voltages of 3.0V or 3.3V, and the MAX779L output can be adjusted from 2.5V to 6V through an external resistive divider. The devices include an Active Rectifier TM that eliminates the need for an external catch diode, and permits regulation even when the input is greater than the output. Also, unlike those in other step-up converters, the MAX777L/MAX778L/MAX779L’s Active Rectifier TM turns off in the shutdown mode, disconnecting the output from the source. This eliminates the current drain associated with conventional step-up converters when off or in shutdown. High-frequency operation (up to 150k Hz) allows the use of small, surface-mount inductors with values of 10µH or less. Supply current is 190µA under no load and only 20µA in standby mode; supply voltage can range from 1V to 4.5V (1 to 3 cells). With a 2V input, the devices typically deliver 200m A at 5V, or 300m A at 3V. For fully specified devices designed for step-up/step-down applications (where the input can be above or below the output), refer to the MAX877L/MAX878L/MAX879L data sheet. MAX777L/MAX778L/MAX779L ______________Ordering Information PART MAX777LCPA MAX777LCSA MAX777LC/D MAX777LEPA MAX777LESA MAX777LMJA 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 -55°C to +125°C PIN-PACKAGE 8 Plastic DIP 8 SO Dice- 8 Plastic DIP 8 SO 8 CERDIP- - ________________________Applications Single Battery-Cell (1V), Step-Up Voltage Conversion Efficient, High-Power Step-Up Regulation from Low Input Voltages Pagers Portable Instruments & Hand-Held Terminals Notebook and Palmtop puters Ordering Information continued at end of data sheet. - Dice are specified at TA = +25°C, DC parameters only. - - Contact...