RP173K351B-TR [RICOH]
Fixed Positive LDO Regulator, 3.5V, 1.05V Dropout, CMOS, PDSO4, 1 X 1 MM, HALOGEN FREE AND ROHS COMPLIANT, DFN-4;
| 型号： | RP173K351B-TR |
| 厂家： | 
RICOH ELECTRONICS DEVICES DIVISION |
| 描述： | Fixed Positive LDO Regulator, 3.5V, 1.05V Dropout, CMOS, PDSO4, 1 X 1 MM, HALOGEN FREE AND ROHS COMPLIANT, DFN-4 光电二极管 输出元件 调节器 |
| 文件： | 总2页 (文件大小：363K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
RP173x Series
Low Supply Current 150mA 11V Input LDO with Reverse Current Protection
The RP173x Series are CMOS-based LDO regulators featuring 150mA output and low supply current of Typ. 2.0μA. RP173x Series are
suitable for the power source such as the equipment being in the standby-mode. A version with
input pin has reduced CE pull-up
CE
∗
resistor to make its supply current ultra low. The RP173x Series have Max.11V Input voltage and are applicable to the portable
communication equipment that require the 2-cell Li-ion battery. Also they are applicable to the non-portable communication
equipments. As this series includes Reverse Current Protection Circuit, there is little leakage current, if it's used as back-up circuit.
SOT-23-5 and SC-88A packages, a 1mm square DFN(PLP)1010-4 package are available. Ceramic capacitors can be used.
∗) Please check the condition
FEATURES
• Supply Current (Iss)·························Typ. 2μA (VIN=VSET+1.0V)
• Standby Current (Istandby) ·················Typ. 0.2μA (VIN=VSET+6.5V, In standby)
• Dropout Voltage (VDIF) ····················Typ. 0.9V (IOUT=150mA, VSET=2.8V)
• Input Voltage Range (VIN)···············2.5V to VSET+6.5V (Max.11.0V)
• Output Voltage Range (VOUT)··········1.2V to 5.5V (Internally fixed)
• Output Voltage Accuracy ················± 1%
• Line Regulation·······························Typ. 0.02%/V
• Fold-back Protection Circuit············Current limit Typ. 45mA
•
Reverse Current Protection Circuit ······Reverse Current Max.0.16μA
• Auto-discharge Function·················D Version
• Packages········································DFN(PLP)1010-4,
SC-88A, SOT-23-5
• Temp. coeff. of Output Voltage ·······Typ. ± 100ppm/°C
• Ceramic capacitors can be used. ···0.1μF or more
°
°
°
(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
RP173xxxxA
RP173xxxxB
(CE pin "H" active)
RP173xxxxD
(With Auto-discharge function)
(
"L" active)
CE
pin
VDD
VDD
VDD
V
OUT
VOUT
V
OUT
Vref
Vref
Vref
Current Limit
Current Limit
Current Limit
Reverse
Detector
Reverse
Detector
Reverse
Detector
CE
GND
CE
GND
GND
CE
Pull-up resistance is not built-in
SELECTION GUIDES
.
xx
.
: Specify the output voltage within the range of 1.2V (
in 0.1V steps.
:Select the polarity of the CE pin from (
.
12
.
) to 5.5V (
.
55
.
)
Halogen Free
Package
Q'ty per Reel
Part No.
DFN(PLP)1010-4 10,000 pcs RP173K
.
xx
.
1.
∗
.
-TR
.
.
.
A
.
) "L" active,
∗
SC-88A
SOT-23-5
3,000 pcs RP173Q
3,000 pcs RP173N
.
xx
.
2
.
∗
.
-TR-FE
(.
B
.
) "H" active, or (
.
D
.
) "H" active with auto-discharge function.
.
xx
.
1.
∗
.
-TR-FE
PACKAGES (Top View)
TYPICAL CHARACTERISTIC
RP173x30xx Dropout Voltage vs. Output Current
DFN(PLP)1010-4
SC-88A
SOT-23-5
5
4
5
4
4
3
800
85
25
°
°
°
C
C
C
700
600
500
400
300
200
100
0
∗
-40
1
2
1
2
3
1
2
3
1
2
3
4
VOUT
GND
1
2
3
4
5
1
2
3
4
5
VDD
GND
CE or CE
NC
GND
VOUT
CE or CE
VDD
CE or CE
NC
VOUT
VDD
0
25
50
75
100 125 150
) The tab is substrate level (GND).
∗
Output Current IOUT (mA
)
APPLICATIONS
• Power source for hand-held communication equipment, cameras, and VCRs
• Power source for home appliances
• Power source for battery-powered equipment
No.EK-256-121001
CMOS LDO Regulator
RP173x Series
CMOS LDO Regulator
Low Supply Current 150mA 11V Input LDO with Reverse Current Protection
Reverse Current Protection Circuit
The Reverse Current Protection Circuit stops the reverse current
from VOUT pin to VDD pin or to GND pin when VOUT becomes
higher than VIN.
ECO
Usually, the LDO using Pch output transistor contains a parasitic
diode between VDD pin and VOUT pin. Therefore, if VOUT is higher
than VIN, the parasitic diode conducts in forward direction. As a
result, the current flows from VOUT pin to VDD pin.
VDD
VOUT
RP173x Series switches to the reverse current protection mode
before VIN becomes lower than VOUT by connecting the parasitic
diode of Pch output transistor to the backward direction, and
connecting the gate to VOUT pin.
Vref
Current Limit
Reverse Detector
CE
GND
As a result, the Pch output transistor is turned off and the current
path from VOUT pin to GND pin is disconnected. (Except RP115x)
∗
indicates a parasitic diode.
When using a backup circuit. In case of using LDO that doesn't have a Reverse Current Protection Circuit as shown in the left
figure, a protection schottky diode is required with the LDO. Please note that a schottky diode causes a dropout of about 0.3V and
leakage current of a few μA to 50μA.
When using an LDO including the Reverse Current Protection Circuit such as RP173x, the protection diode is not needed as
shown in the right figure. Therefore, it can prevent the voltage drop and the leakage current.
Parasitic diode Protection diode
Vf
OUT
Vf
VOUT
V
RTC
RTC
VDD
V
DD
Memory
Memory
etc.
etc.
RP173x
Leakage
current
Main
Power
Supply
Main
Power
Supply
Leakage
current
Regulator
Back-up
Power
Back-up
Power
Supply
GND
GND
Supply
GND
GND
Products with Reverse Current Protection Circuit
∗) Under Development
R1155x∗
R1163x
R1191x
RP108x
RP115x
RP173x
The currently available information as of October 2012 is provided in this New Product News.
EK-256-121001
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