RP202x Series
Automatic Mode Shift Low Voltage 200mA LDO
The RP202x Series are CMOS-based auto mode switching LDO regulators featuring 200mA output. In auto switching mode, the
operation can switch automatically to fast response mode or low power mode of the ECO function according to output current.
(Automatic switching to fast response mode under I
OUT
> 8mA conditions or to low power mode under I
OUT
< 1mA conditions.)
In low power mode, supply current is as low as 2.5μA. In fast response mode, ripple rejection is 70dB and noise is low. RP202x
requires neither ECO pin for switching mode nor microcontroller pin. RP202x supports low voltage, featuring input voltage from 1.4V
and output voltage from 0.8V. Standby mode and auto-discharge function are also available. In addition to SOT-23-5 and SC-88A
packages, and a 1mm square DFN(PLP)1010-4 are also available. RP202x Series contributes to the downsizing of the hand-held
equipment because it can use the 0.47μF ceramic capacitor.
FEATURES
•
Supply Current (I
SS2
) ······················· Typ. 50μA (Fast mode, V
IN
=V
SET
+1.0V)
•
Supply Current (I
SS1
) ······················· Typ. 2.5μA (Low power mode, same as above, V
SET
=2.8V)
•
Standby Current (I
standby
) ················· Typ. 0.1μA (Same as above, CE="L")
•
Dropout Voltage (V
DIF
) ···················· Typ. 0.20V (I
OUT
=200mA, V
SET
=2.8V)
•
Ripple Rejection (RR)····················· Typ. 70dB (f=1kHz, Fast mode)
•
Input Voltage Range (V
IN
) ··············· 1.4V to 5.25V
•
Output Voltage Range (V
OUT
)·········· 0.8V to 4.0V (Internally fixed)
•
Output Voltage Accuracy ················± 1%
•
Temp. coeff. of Output Voltage ······· Typ.
±
100ppm/°C
•
Line Regulation ······························ Typ. 0.02%/V (Fast mode)
•
Fold-back Protection Circuit ··········· Current limit Typ. 60mA
•
Auto-discharge Function ················ D Version
•
Constant Slope Circuit (Soft Start Function)
•
Packages ······································· DFN(PLP)1010-4,
•
Ceramic capacitor can be used.····· 0.47μF or more
SC-88A, SOT-23-5
(The above shows specification at Topt=25
°
C. Design assurance value at -40
°
C
≤
Topt
≤
85
°
C is also available. For details, please refer to the datasheet.)
BLOCK DIAGRAMS
RP202xxxxB
(Without Auto-discharge function)
V
DD
V
OUT
V
DD
RP202xxxxD
(With Auto-discharge function)
V
OUT
Vref
Current Limit
Vref
Current Limit
CE
GND
CE
GND
SELECTION GUIDES
Halogen Free
Package
Q'ty per Reel
Part No.
DFN(PLP)1010-4 10,000 pcs RP202K.xx.1.
∗
-TR
SC-88A
3,000 pcs RP202Q.xx.2.
∗
-TR-FE
SOT-23-5
3,000 pcs RP202N.xx.1.
∗
-TR-FE
.xx.
: Specify the output voltage within the range of 0.8V (.08.) to 4.0V (.40.)
in 0.1V steps.
.∗
: Select from (.B.) without auto-discharge function or
(.D.) with auto-discharge function
PACKAGES (Top View)
DFN(PLP)1010-4
4
3
TYPICAL CHARACTERISTIC
SOT-23-5
5
4
SC-88A
5
4
RP202x28xx
250
Dropout Voltage V
DIF
(mV)
Dropout Voltage vs. Output Current
85°C
25°C
-40°C
∗
200
150
100
50
0
1
2
1
2
3
1
2
3
1
2
3
4
V
OUT
GND
CE
V
DD
1
2
3
4
5
CE
NC
GND
V
OUT
V
DD
1
2
3
4
5
V
DD
GND
CE
NC
V
OUT
0
∗)
The tab is substrate level (GND).
50
100
150
Output Current I
OUT
(mA)
200
APPLICATIONS
•
Power source for hand-held communication equipment, camera and VCRs
•
Power source for home appliances and digital home appliances
No.EK-279-121001
•
Power source for battery-powered equipment
200mA CMOS LDO Regulator
RP202x Series
Automatic Mode Shift Low Voltage 200mA LDO
How to Switch the ECO Function
200mA CMOS LDO Regulator
An increasing number of devices such as mobile phones, do not have only a talk mode (active mode) and Off mode state, but also a
standby mode (sleep mode) etc. However during the active mode and sleep mode the regulator must satisfy very different
requirements.
The regulators are required to have a fast response and a high ripple rejection in the active mode, but consume low supply current
in the sleep mode. To satisfy these conflicting requirements, Ricoh's regulators include an ECO Function that allows switching
between a fast response mode and a low power mode.
There are three methods of switching the ECO Function and Ricoh offers four types of products utilizing each method.
Manual Mode Shift Type·····················The mode is switched by controlling an ECO pin.
The user can set the switching conditions but an extra CPU control pin is required.
Automatic Mode Shift Type ················The ECO pin is eliminated and the regulator automatically switches between modes depending on system load.
A CPU I/O pin can be omitted but the user cannot set the switching conditions.
Seamless Type···································Instead of switching between two modes, a smooth transition is made between modes.
Manual/Automatic Mode Shift Type····The mode is switched by controlling an AE pin.
When AE="H", the mode is set to the fast response mode, and when AE="L", the regulator
operates like the Automatic Mode Shift Type.
This type has both advantage of the Manual Mode Shift Type and the Automatic Mode Shift Type.
Comparison of Automatic Mode Shift Type
RP202x
Input voltage Range
Output voltage Range
Output Voltage Accuracy
Output Current
Supply Current
Standby Current
Ripple Rejection
Output Capacitor
Dropout Voltage (Typ.)
Line Regulation
Load regulation
Packages
Others
1.4V to 5.25V
0.8V to 4.0V
±1%
200mA
50μA (Fast mode)
2.5μA (Low power mode)
0.1μA
70dB (Fast mode)
0.47μFor more
0.2V (200mA/2.8V)
0.02%/V
Max. 30mV (200mA)
DFN(PLP)1010-4,
SC-88A,
SOT-23-5
Constant Slope Circuit
R1510S (+VD)
3.5V to 36.0V
2.5V to 12.0V
±1.6%
300mA
110μA (Fast mode)
12.5μA (Low power mode)
10μA
-
6.8μFor more
1.0V (300mA/5.0V)
0.01%/V
Max. 40mV (300mA)
HSOP-8E
Thermal Shutdown Circuit
R5326K (Dual)
1.4V to 6.0V
0.8V to 4.2V
±1%
150mA
50μA×2 (Fast mode)
5.5μA×2 (Low power mode)
0.1μA×2
70dB (Fast mode)
1μF to 3.3μF or more
0.19V (150mA/2.8V)
0.02%/V
Max. 80mV (150mA)
DFN(PLP)1820-6
The currently available information as of October 2012 is provided in this New Product News.
EK-279-121001
模拟电子
