RP105x Series
400mA 0.9V Input LDO with dual input pin
The RP105x Series are CMOS-based LDO regulators featuring 400mA output with dual input pin. The input voltage can correspond
from 0.9V by the inputting voltage into V
BIAS
. The UVLO function will lock out the internal circuit, if the input voltage is less than the
UVLO voltage. Due to a built-in Nch. transistor with low on-resistance of 0.4
Ω
(at V
OUT
=
0.8V), RP105x provides a low dropout voltage.
RP105x also has an excellent line transient response. In addition to SOT-23-5 and SC-88A packages, a 1.2mm square DFN(PLP)1212-6
package is also available.
FEATURES
•
Supply Current (I
SS
) ························ Typ. 28μA (V
IN
=SET V
OUT
+0.5V)
•
Standby Current (I
standby
) ················· Typ. 0.1μA (Same as above, CE=”L”)
•
Dropout Voltage (V
DIF
) ···················· Typ. 0.18V (I
OUT
=400mA, V
BIAS
=3.6V)
•
Ripple Rejection (RR)····················· Typ. 80dB (f=1kHz, V
IN
Ripple)
•
Input Voltage Range1 (V
BIAS
) ·········· 2.4V to 5.25V
∗
•
Input Voltage Range2 (V
IN
) ············ 0.9V to V
BIAS
∗
•
Output Voltage Range (V
OUT
)·········· 0.6V to1.5V (internally fixed)
•
Output Voltage Accuracy ················± 15mV
•
Temp.coeff.of Output Voltage ·········Typ.
±
50ppm/°C
•
Line Regulation·······························Typ. 0.02%/V
•
Fold-back Protection Circuit ···········Current limit Typ.120mA
•
Auto-Discharge function ·················D Version
•
Packages ········································DFN(PLP)1212-6,
SC-88A, SOT-23-5
•
Ceramic capacitors can be used. ···C
BIAS
=C
IN
=1μF or more,
C
OUT
=2.2μF or more
(The above shows specification at Topt=25
°
C. Design assurance value at -40
°
C
<
Topt
<
85
°
C is also available.)
∗
) For detail, please check our website.
=
=
BLOCK DIAGRAMS
RP105xxxxB
(Without Auto-Discharge function)
V
BIAS
V
IN
V
OUT
V
BIAS
V
IN
V
OUT
RP105xxxxD
(With Auto-Discharge function)
UVLO
Vref
Current Limit
UVLO
Vref
Current Limit
CE
GND
CE
GND
SELECTION GUIDES
Quantity per
Part No.
Reel
DFN(PLP)1212-6 5,000 pcs RP105K.xx.1.
∗
-TR
SC-88A
3,000 pcs RP105Q.xx.2.
∗
-TR-F
SOT-23-5
3,000 pcs RP105N.xx.1.
∗
-TR-F
Package
.xx.
: Specify the output voltage within the range
0.6V (.06.) to 1.5V (.15.) in 0.1V steps.
.∗
: Select from (.B.) without auto-discharge function or
(.D.)with auto-discharge function
TYPICAL APPLICATION
DC/DC_OUT
RP500x
RP105x
L
V
IN
3.6V
Li-ion
or
3cell
L
X
4.7μH
CE
V
OUT
CE
V
BIAS
V
OUT
VR_OUT
AGND PGND
C
IN
10μF
Step-down
DC/DC
Converter
C
OUT
10μF
C
BIAS
1μF
C
IN
1μF
V
IN
GND
C
OUT
2.2μF
PACKAGES
DFN(PLP)1212-6
Top View
4
5
6
TYPICAL CHARACTERISTIC
SC-88A
5
4
SOT-23-5
5
4
RP105x15xx
300
Dropout Voltage V
DIF
(mV)
Dropout Voltage vs. Output Current
85°C
25°C
-40°C
Bottom View
6
5
4
250
200
150
100
50
0
0
1
2
3
3
2
1
1
1
2
3
2
3
1
2
3
4
5
6
V
BIAS
GND
CE
V
IN
NC
V
OUT
1
2
3
4
5
V
BIAS
GND
V
OUT
V
IN
CE
1
2
3
4
5
V
IN
GND
CE
V
BIAS
V
OUT
100
200
300
Output Current I
OUT
(mA)
400
APPLICATIONS
•
Power source for hand-held communication equipment, cameras, and VCRs
•
Power source for home appliances
•
Power source for battery-powered equipment
No.EK-179-100119
CMOS LDO Regulator
RP105x Series
400mA Low Voltage LDO Regulator with dual input pin
CMOS LDO Regulator
WHAT ARE RP SERIES
The new Ricoh IC series perform better due to a newly applied manufactured process, compared to the current products.
RP105x TYPICAL APPLICATION
Step down DC/DC converters have been selected many times recently, because of regulator's big energy loss by becoming lower voltage of mobile
devices.
But DC/DC converters require many parts including inductors.
The combining of DC/DC with regulators can reduce energy loss, space, and noize, in case of plural power supply lines.
TYPICAL APPLICATION
Power
Supply
Unit
3.6V
Step-down
DC/DC Converter
RP500x Series
150mA LDO
Regulator
RP103
400mA LDO
Regulator
RP105
1.8V
Device1
1.2V
Device2
0.8V
3.6V
Device3
WHAT IS DFN(PLP)1212-6
The DFN(PLP)package is a leadless package using an electroforming sheet in place of lead frame.
This extremely compact package features increased power dissipation and conversion to thinner type.
The name is representing by a combination of the body size and the number of pins, i.e.,
DFN(PLP)1212-6 stands for the body size of 1.2mm×1.2mm and 6pins.
An environment-friendly, leadfree package with gold plated contacts complies with the RoHS Directive.
The currently available information as of January 2010 is provided in this New Product News.
EK-179-100119
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