R5102V [RICOH]
LDO Regulators with a Watchdog Timer; LDO稳压器具有看门狗定时器
| 型号： | R5102V |
| 厂家： | 
RICOH ELECTRONICS DEVICES DIVISION |
| 描述： | LDO Regulators with a Watchdog Timer |
| 文件： | 总13页 (文件大小：137K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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NO. EA-072-0006
LDO Regulators with a Watchdog Timer
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OUTLINE
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FEATURES
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APPLICATION
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1
R5102V
BLOCK DIAGRAMS
SSOP10
V
DD
1
2
3
4
5
10 GND
Voltage
Regulator2
R
OUT2
9
8
7
6
CE1
CE2
CTW
Voltage
Regulator1
EXT
Watchdog
Timer
R
OUT1
SCK
R
ESET
PIN CONFIGURATION
10 9
8 7 6
1
2 3 4 5
PIN DESCRIPTION
Symbol
Description
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R5102V
ABSOLUTE MAXIMUM RATINGS
7RSW 58°&/#966 39
Symbol
9,1
Item
Input Voltage
Rating
Unit
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R5102V
ELECTRICAL CHARACTERISTICS
• Overall
7RSW 58°&
Symbol
9,1
Item
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Conditions
MIN.
TYP.
MAX.
Unit
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Symbol
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Item
Conditions
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MIN.
TYP.
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Unit
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*NOTE Output Current depends on the external PNP transistor. Use a low saturation transistor with hFE
range of 100 to 300.
4
R5102V
• VR2
Symbol
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Item
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Conditions
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MIN.
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Unit
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TYP.
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Unit
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5
R5102V
TYPICAL CHARACTERISTICS
1) Output Voltage vs. Output Current
(Topt=25°C)
VR1
VR2
R5102V001A
R5102V001A
V
IN=3.8V
VIN=4.3V
3.0
2.9
2.8
3.5
3.0
2.5
2.0
1.5
1.0
-40°C
85°C
25°C
2.7
2.6
0.5
0.0
0
50
100
150
200
250
300
0
100
200
300
400
300
Output Curren2 IOUT2 (mA)
Output Current IOUT1 (mA)
2) Output Voltage vs. Input Voltage
(Topt=25°C)
VR1
VR2
R5102V001A
R5102V001A
3.5
3.4
3.3
3.0
2.9
1mA
I
OUT=0mA
2.8
30mA
10mA
100mA
3.2
3.1
2.7
10mA
2.6
3.0
3.5
4.0
4.5
5.0
5.5
6.0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Input Voltage VIN (V)
Input Voltage VIN (V)
3) Dropout Voltage vs. Output Current
VR1
VR2
R5102V001A
R5102V001A
V
SET1=2.8V
V
SET2=3.3V
0.50
0.40
0.30
1.0
0.8
0.6
85°C
85°C
0.20
0.10
0.00
0.4
0.2
0.0
25°C
-40°C
25°C
-40°C
0
100
200
300
400
500
0
10
20
30
40
50
Output Current1 IOUT1 (mA)
Output Current2 IOUT2 (mA)
6
R5102V
4) Output Voltage vs. Temperature
VR1
VR2
R5102V001A
R5102V001A
V
DD=3.8V, IOUT1=10mA
VDD=4.3V, IOUT1=10mA
2.90
2.85
2.80
3.40
3.35
3.30
2.75
2.70
3.25
3.20
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
Temperature Topt (°C)
Temperature Topt (°C)
5) Supply Current1 vs. Input Voltage
6) Supply Current2 vs. Input Voltage
R5102V001A
R5102V001A
Topt=25(°C)
Topt=25(°C)
60
50
40
30
20
60
50
40
30
20
10
0
10
0
0
1
2
3
4
5
6
0
1
2
3
4
5
6
Input Voltage VIN (V)
Input Voltage VIN (V)
7) Supply Current3 vs. Input Voltage
8) Supply Current4 vs. Input Voltage
R5102V001A
R5102V001A
Topt=25(°C)
Topt=25(°C)
10
9
6
5
4
3
2
8
7
6
5
4
3
2
1
0
1
0
0
1
2
3
4
5
6
0
1
2
3
4
5
6
Input Voltage VIN (V)
Input Voltage VIN (V)
7
R5102V
9) Supply Current1 vs. Temperature
10) Supply Current2 vs. Temperature
R5102V001A
R5102V001A
V
DD=4.2V,VCE1/=VCE2/=0V
VDD=VCE2/=4.2V,VCE1/=0V
60
50
40
30
20
60
50
40
30
20
10
0
10
0
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
Temperature Topt (°C)
Temperature Topt (°C)
11) Supply Current3 vs. Temperature
12) Supply Current4 vs. Temperature
R5102V001A
R5102V001A
VDD=VCE1/=4.2V,VCE2/=0V
VDD=VCE1/=4.2V,VCE2/=0V
6
10
9
5
4
3
2
8
7
6
5
4
3
2
1
0
1
0
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
Temperature Topt (°C)
Temperature Topt (°C)
13) Ripple Rejection vs. Frequency
VR1
VR2
R5102V001A
IN=3.8VDC+0.5VPP,IOUT1=50mA C
R5102V001A
VIN=4.3VDC+0.5VPP,IOUT2=10mA CL=1.0µF
V
L=4.7µF
80
80
70
60
50
40
30
70
60
50
40
30
20
10
0
20
10
0
0.01
0.1
1
10
0.01
0.1
1
10
Frequency f(kHz)
Frequency f(kHz)
8
R5102V
14) WDT Reset and Watchdog Timeout Periods vs. External Capacitance (Topt=25°C)
R5102V001A
1E+5
1E+4
1E+3
twd
1E+2
1E+1
1E+0
1E-1
twr
1E-4
1E-3
1E-2
1E-1
1E-0
CTWExternal Capacitance (µF)
9
R5102V
TIMING DIAGRAM
V
DD
Vstart
ROUT1
V
CE1
T
WD
T
WR
V
ref2H
V
V
CTW
ref2L
T
SCKW
V
SCK
V
RESET
1
2
3
4
4
5
6
5
6
4
4
7
8
4
4
4
9
10
R5102V
OPERATION
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11
R5102V
APPLICATION NOTES
Phase Compensation
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External PNP Transistor
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Mounting on Board
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TYPICAL APPLICATION
V
DD
1
2
3
4
5
10 GND
Voltage
Regulator2
R
OUT2
9
8
7
6
CE1
CE2
CTW
Voltage
Regulator1
EXT
Watchdog
Timer
R
OUT1
SCK
R
ESET
12
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