Electronic Components Datasheet Search |
|
MAX877 Datasheet(PDF) 1 Page - Maxim Integrated Products |
|
MAX877 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 12 page _______________General Description The MAX877/MAX878/MAX879 are pulse-skipping, step- up/step-down DC-DC converters that provide a regulated output from inputs both above and below the output. They require only three external components—an inductor (typically 22µH) and two filter capacitors. The MAX877 delivers a regulated 5V output from 2.5V to 6.2V inputs. The MAX878 generates pin-selectable volt- ages of 3.0V or 3.3V from 1.5V to 6.2V inputs. The MAX879 output can be adjusted from 2.5V to 6V via an external resistor divider from 2.5V to 6.2V inputs. A unique high-power, internal, synchronous rectifier design (Active Rectifier™) enables the devices to regulate in a switched linear mode if the input voltage is higher than the desired output voltage. When the input voltage falls below the output voltage, the MAX877/MAX878/MAX879 will smoothly switch into a pulse-skipping boost mode and step up from input voltages as low as 1V. In shutdown, the active rectifier disconnects the output from the source. This stops the current drain from input to output associated with conventional step-up converters. High-frequency operation (up to 300kHz) allows the use of small surface-mount inductors. Supply current is 195µA under no load, and only 20µA in shutdown mode. For 1-cell (1V) step-up converters with similar performance and the same pinout, refer to the MAX777/MAX778/MAX779 data sheet. ________________________Applications Two or Three NiCd Cells to 3V/3.3V Conversion Three or Four Alkaline Cells to 5V Conversion One Lithium Cell to 3V/3.3V Conversion Pagers Palmtop and Notebook Computers Battery-Powered and Hand-Held Instruments ____________________________Features o Regulates from Inputs Above & Below the Output o 1V to 6.2V Supply-Voltage Range o Internal 1A Active Rectifier with Input-to-Output Disconnect in Shutdown o Up to 210mA Load Currents, Guaranteed o 85% Efficiency o Only 3 External Components o Adjustable Current Limit o 195µA Quiescent Supply Current o 20µA Shutdown Supply Current o 3V/3.3V/5V and Adjustable Output Voltage Versions o Available in 8-Pin DIP and SO Packages ______________Ordering Information Ordering Information continued on last page. * Contact factory for dice specifications. 5V/3.3V/3V/Adjustable-Output, Step-Up/Step-Down DC-DC Converters ________________________________________________________________ Maxim Integrated Products 1 INPUT 1.8V TO 6.2V IN ILIM SHDN 100µF OUTPUT 3.3V 210mA AGND MAX878 LX OUT PGND 22µH ON/OFF 22 µF 1 2 7 8 3 6 5 SEL 4 __________________Pin Configuration 1 2 3 4 DIP/SO TOP VIEW MAX877 MAX878 MAX879 8 7 6 5 N.C. (MAX877)* SHDN OUT LX ILIM IN AGND PGND * SEL (MAX878), FB (MAX879) __________Typical Operating Circuit Call toll free 1-800-998-8800 for free samples or literature. 19-0204; Rev 1; 5/94 PART TEMP. RANGE PIN-PACKAGE MAX877CPA 0°C to +70°C 8 Plastic DIP MAX877CSA 0°C to +70°C 8 SO MAX877C/D 0°C to +70°C Dice* MAX877ESA -40°C to +85°C 8 SO MAX877EPA -40°C to +85°C 8 Plastic DIP MAX877MJA -55°C to +125°C 8 CERDIP ™ Active Rectifier is a trademark of Maxim Integrated Products. EVALUATION KIT MANUAL FOLLOWS DATA SHEET |
Similar Part No. - MAX877 |
|
Similar Description - MAX877 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |