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RP901x Series


Step Down DCDC converter with LDO and Reset




| * Outline | * Features | * Applications | * Documenets Download |



Outline


The RP901K is CMOS based PWM step-down DC/DC converter combined with a 600mA LDO and a voltage detector (VD), with low supply current.
Because ofDFN( PLP)2527-10 package, high density mounting on boards is possible.


Step-down DC/DC converter
This portion consists of an oscillator, a switching control circuit, a reference voltage unit, an error amplifier, a soft-start circuit, current protection circuits, UVLO circuit, switching transistors and so on.
Because of synchronous rectifier type, a low ripple and high efficiency DC/DC converter can be easily composed of this IC with an inductor and capacitors only.
Mode alternative circuit works automatically for improving the efficiency at light load.
As protection circuits, the current limit circuit which limits peak current of Lx at each clock cycle, and latch type protection circuit which works if term of the over-current keeps on a certain time exists. The latch-type protection circuit works to latch an internal driver with keeping it disable. (LDO and VD keep working.)
In order to release the condition of the protection, after disabling 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.
The output voltage is internally fixed with +/-2% tolerance.


LDO

This portion consists of a reference voltage unit, an error amplifier, a short current protection circuit and so on.
The output voltage is internally fixed with +/-1% tolerance


VD

The input voltage is monitored by VD with Nch open drain output.
Power-on reset delay time is also included and internally set typically at 50ms.
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Features


*Input Voltage range 4.5V to 5.5V
*Supply Current Typ. 460µA
*Supply Current at light load Typ. 170µA
*Package DFN(PLP)2527-10
*External Components CIN=10μF
:COUT=10μF, L=4.7μH (DC/DC)
:COUT=2.2μF (LDO)
*Step-down DCDC converter
*Ouput Voltage range 1.2V to 1.8V
*Accuracy Output Voltage ±2%
*Oscillator Frequency Typ.1.2MHz
*Built-in Driver ON Resistance Typ.0.25Ω,Nch 0.25Ω(Pch/Nch at VIN=5V)
*Soft Start time Typ.1ms
*Lx peak current Typ.1.4A
*Output Current Min.800mA
*Built-in Latch type Protection Typ.0.1ms
*Built-in UVLO Function Typ.3.5V
*LDO
*Ouput Voltage range 2.5V to 3.3V
*Accuracy Output Voltage ±1.0%
*Output Current Min.600mA
*VD
* Voltage Detector Threshold Voltage range
3.0V to 5.0V
*Power-on reset delay time Typ.50ms
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Applications

Power source for Optical Disk Drives.
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Documents Download


Data Sheet
(PDF)
Package Info.
(PDF)
Mark Info.
(PDF)
Quality Assurance Data
(PDF)
*RP901x Series
2008/03/12(137KB)
*DFN(PLP)2527-10 to be prepared *Reliability

* All PDF files are less than 1MB unless otherwise stated.
* If you don't have Adobe Reader, you can download free.
* Get Adobe Reader
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Technical Info.

* Application Note

Application Note

Technical Information on Ricoh Power Management ICs.
*

Quick Links

* Quality Assurance System
(PDF:175KB)
* Inductor Information
(PDF:70KB)


Product Catalog

Selection Guide
Selection guide is available for download in PDF format.



Non-promotion / Discontinued Products

* Power Management ICs
* Real-time clock ICs


Lead (Pb) Free Information

All of the Lead-free products comply with RoHS Directive. RoHS Compliant


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