PWM Step-down DC/DC Converter With Switch Function

The R5220D R5220K Series are CMOS-based PWM Step-down DC/DC Converters with synchronous Rectifier low supply current and LDO mode. DC/DC converter of the R5220D R5220K consists of an Oscillator a PWM control circuit, a reference voltage unit, an error Amplifier a soft-start circuit, protection circuits, a protection against miss operation under low voltage (UVLO), PWM-DC to DC converter / LDO alternative circuit, a chip enable circuit, and a driver Transistor A high efficiency Step-down DC/DC converter CAN be easily composed of this IC with only a few kinds of external components, or an inductor and capacitors. LDO of the R5220x consists of a vortage reference unit, an error Amplifier resistors for voltage setting, output current limit circuit, a driver Transistor and so on. The output voltage is fixed internally in the R5220x. The output voltage of the DC/DC converter and the LDO CAN be set independently. PWM Step-down DC/DC converter / LDO alternative circuit is active with Mode Pin of the R5220x Series. Thus, when the load current is small, the operation CAN be switching into the LDO operation from PWM operation by the Logic of MODE pin and the consumption current of the IC itself will be small at light load current. As protection circuits, the current limit circuit which limits peak current of Lx at each Clock cycle, and the latch type protection circuit which works if the term of the over-current condition keeps on a certain time in PWM mode. Latch-type protection circuit works to latch an internal driver with keeping it disable. To release the protection, after disable this IC with a chip enable circuit, enable it again, or restart this IC with power-on or make the supply voltage at UVLO detector threshold level or lower than UVLO.
By RICOH Co.,Ltd.
R5220K 's PackagesR5220K 's pdf datasheet
R5220D101A
R5220D111A
R5220D121A
R5220D131A
R5220D141A
R5220D151A
R5220D161A
R5220D171A
R5220D181A
R5220D191A
R5220D201A
R5220D211A
R5220D221A
R5220D231A
R5220D241A
R5220D251A
R5220D261A
R5220D271A
R5220D281A
R5220D291A
R5220D301A
R5220D311A
R5220D321A
R5220D331A
R5220D101B
R5220D111B
R5220D121B
R5220D131B
R5220D141B
R5220D151B
R5220D161B
R5220D171B
R5220D181B
R5220D191B
R5220D201B
R5220D211B
R5220D221B
R5220D231B
R5220D241B
R5220D251B
R5220D261B
R5220D271B
R5220D281B
R5220D291B
R5220D301B
R5220D311B
R5220D321B
R5220D331B
R5220D261B5
R5220D012A
R5220D022A
R5220D032A
R5220D042A
R5220D012B
R5220D022B
R5220D032B
R5220D042B
R5220K101A
R5220K111A
R5220K121A
R5220K131A
R5220K141A
R5220K151A
R5220K161A
R5220K171A
R5220K181A
R5220K191A
R5220K201A
R5220K211A
R5220K221A
R5220K231A
R5220K241A
R5220K251A
R5220K261A
R5220K271A
R5220K281A
R5220K291A
R5220K301A
R5220K311A
R5220K321A
R5220K331A
R5220K261A5
R5220K101B
R5220K111B
R5220K121B
R5220K131B
R5220K141B
R5220K151B
R5220K161B
R5220K171B
R5220K181B
R5220K191B
R5220K201B
R5220K211B
R5220K221B
R5220K231B
R5220K241B
R5220K251B
R5220K261B
R5220K271B
R5220K281B
R5220K291B
R5220K301B
R5220K311B
R5220K321B
R5220K331B
R5220K261B5
R5220K012A
R5220K022A
R5220K032A
R5220K042A
R5220K012B
R5220K022B
R5220K032B
R5220K042B
R5220D




R5220K Pinout, Pinouts
R5220K pinout,Pin out
This is one package pinout of R5220K,If you need more pinouts please download R5220K's pdf datasheet.

R5220K Application circuits
R5220K circuits
This is one application circuit of R5220K,If you need more circuits,please download R5220K's pdf datasheet.


Related Electronics Part Number

Related Keywords:

R5220K Pb-Free R5220K Cross Reference R5220K Schematic R5220K Distributor
R5220K Application Notes R5220K RoHS R5220K Circuits R5220K footprint