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RICOH RP505K SERIES DATA SHEET

1. RICOH 1A PWM VFM Step down DC DC Converte RP505K Series The RP505K Series are low supply current CMOS based PWM VFM step down DC DC converters with synchronous rectifier RP505K can be selected from two control types by input signal to the MODE pin forced PWM control or PWM VFM auto switching control in which mode automatically switches to high efficiency VFM mode in low output current The xx1A B version with an internally fixed output voltage type and the 001C version with an externally adjustable output voltage type are available RP505K includes a soft start circuit an under voltage lockout circuit UVLO thermal shutdown circuit and a latch protection circuit By simply using an inductor resistors and capacitors as external components a high efficiency step down DC DC converter can be easily configured The small inductor 2 2uH and output capacitor 10uF can be used by the switching of 2 25MHz A 2mm square compact DFN PLP 2020 8 package is available s i Supply Current lop ereen Typ 500uA Switching Supply Current lop2 eree Typ 40uA No switching VFM Supply Current lpp2 tt Typ 500A No switching PWM e Standby Current Istandby tee Max 5uA CE L Input Voltage Range Vn eeese 2 3V to 5 5V Vset 2 0 8V e Output Voltage Range Vout 0 6V to 3 3V Internally fixed RP505Kxx1A B 0 8V to 3 3V Externally djustable RP505K001C Feedback Voltage 0 6V Out
2. Supply Current PWM Mode Typ 500A Supply Current VFM Mode Typ 40uA Input Voltage Range 2 3V to 5 5V 0 6V to 3 3V Output Voltage Range For less than 0 8V the input voltage range is limited Externally adjustable Latch Protection Circuit Protection Delay Time Typ 1 5ms Oscillator Frequency Oscillator Maximum Duty Cycle UVLO Detect Voltage Soft start Time Coil current Limit Circuit Typ 1 7A Output Voltage Inductor 0 6V lt Vout lt 1 6V 1 0uH or more 1 6V lt Vout lt 2 3V 1 5uH or more 2 3V lt Vout lt 3 3V 2 2uH or more Package DFN PLP 2020 8 Others Built in Thermal shutdown circuit A Version Fixed output voltage type Without auto discharge function B Version Version Fixed output voltage type With auto discharge function C Version Adjustable output voltage type Without auto discharge function This is an approximate value because output current depends on conditions and external parts Inductor RP501K Series PWM VFM automatic shift Fixed PWM It can be switched by MODE pin 1A Typ 450uA Typ 140uA Max 5uA 2 5V to 5 5V 1 0V to 3 3V 1 5 Typ 2 25MHz Min 100 Typ 2 2V Typ 0 14ms Typ 2 0ms Typ 1 5A 2 2uH to 4 7uWH DFN PLP 2527 10 A Version Without auto discharge function B Version With auto discharge function Compliant Halogen Free also Antimony Free LOH S For the conservation of the global environment Ricoh is advancing the decr
3. ease of the negative environmental impact material ca After Apr 1 2006 we will ship out the lead free products only Thus all products that will be shipped from now on comply with RoHS Directive Basically after Apr 1 2012 we will ship out the Power Management ICs of the Halogen Free products only Ricoh Halogen Free products are RI CO RICOH COMPANY LTD E Electronic Devices Company http www ricoh com LSI RICOH COMPANY LTD Electronic Devices Company Higashi Shinagawa Office International Sales 3 32 3 Higashi Shinagawa Shinagawa ku Tokyo 140 8655 Japan Phone 81 3 5479 2857 Fax 81 3 5479 0502 The currently available information as of October 2012 is provided in this New Product News EK 273 121001
4. put Voltage Accuracy 1 5 Feedback Voltage Accuracy 9mV Output Current lout 1A Oscillator Frequency fosc 2 29MHz e Oscillator Maximum Duty Cycle Maxduty Min 100 e UVLO Detect Voltage Vuvio srr Typ 2 0V Soft Start Time tstart rere Typ 0 15ms Thermal Shutdown Circuit eseese e Stops at 140 C Coil current Limit Circuit str Current limit Typ 1 7A Latch Protection Circuit eeveveeenese Delay time for protection Typ 1 5ms Auto discharge Function str B Version e MODE Pin ur aye apts uiay Sear ata aay eval E a EAA HY forced PWM control L PWM VEM auto switching control Packager triers DFN PLP 2020 8 This is an approximate value because output current depends on conditions and external parts xx For less than 0 8V the input voltage range is limited For details please refer to the datasheet BLOCK DIAGRAMS RP505Kxx1A B Internally fixed output voltage type Blue line only RP505Kxx1B SELECTION CUIDE S Halogen Free Package Q ty per Reel Part No RP505K001C Externally adjustable output voltage type TYPICAL APPLICATIONS RP505Kxx1A B RP505K001C DFN PLP 2020 8 5 000 pcs RP505Kxx1 TR RP505K001 TR xx Specify the output voltage within the range of 0 6V 06 to 3 3V 33 in 0 1V steps For externally adjustable out
5. put voltage type 00 Select from A internally fixed output voltage type m COUT T 10uF without auto discharge function or 77 B internally fixed output voltage type with auto discharge function C externally adjustable output voltage type without auto discharge function L MIPSA2520D2R2 FDK Cin C1608JB0J475K TDK Court C1608JB0J106M TDK Set Output Voltage 0 6V lt Vser lt 1 6V 1 6V lt VseT lt 2 3V DFN PLP 2020 8 Top View 8 7 6 5 Bottom View 6 7 The tab is substrate level GND x No 3 pin and No 4 pin No 6 pin and No 7 pin must be wired together when it is mounted on board APPLICATIONS 2 2uH or more TYPICAL CHARACTERISTIC RP505K331x Efficiency vs Output Current WF Vin 4 3V PWM VFM Efficiency n Vin 5 0V PWM VEM jo Vin 4 3V forced PWM 1 10 100 Output Current lout mA 1000 e Power source for battery powered equipment e Power source for Wireless LAN terminals No EK 273 121001 e Power source for hand held communication equipment cameras and VCRs Step down DC DC Converter RP505K Series RP50x Series 1A Step down DC DC Converter Comparison Step down DC DC Converter 1A PWM VFM Step down DC DC Converter with Synchronous Rectifier RP505K Series PWM VFM automatic shift Control Forced PWM It can be switched by MODE pin Output Current

RICOH RP505K SERIES DATA SHEET

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