NO. EA-072-0006
/'2#5HJXODWRUV#ZLWK#D#:DWFKGRJ
7LPHU
584359#6(5,(6
$33/,&$7,21#0$18$/
LDO Regulators with a Watchdog Timer
584359#6(5,(6
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OUTLINE
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FEATURES
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APPLICATION
3RZHU#VRXUFH#IRU#*60
R5102V
2
BLOCK DIAGRAMS
SSOP10
3
EXT
8
CE2
5
SCK
6
R
ESET
1
V
DD
10 GND
2
R
OUT2
9
CE1
4
R
OUT1
7
CTW
Watchdog
Timer
Voltage
Regulator1
Voltage
Regulator2
PIN CONFIGURATION
10
6
1
9
2
5
7
4
8
GND
R
ESET
CE1
CTW
CE2
3
V
DD
R
OUT2
SCK
R
OUT1
EXT
PIN DESCRIPTION
Symbol
Description
9
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*URXQG#3LQ
R5102V
3
ABSOLUTE MAXIMUM RATINGS
7RSW 58
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66
39
Symbol
Item
Input Voltage
Rating
Unit
9
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R5102V
4
ELECTRICAL CHARACTERISTICS
Overall
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Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
9
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Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
9
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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.
R5102V
5
VR2
7RSW 58
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Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
9
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Unit
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R5102V
6
TYPICAL CHARACTERISTICS
1)
Output Voltage vs. Output Current
(Topt=25
C)
VR1
VR2
R5102V001A
R5102V001A
2.8
3.0
2.9
2.7
2.6
Output Current I
OUT1
(mA)
0
200
300
400
300
100
Output V
oltage V
OUT1
(V)
V
IN
=3.8V
2.0
3.5
3.0
2.5
1.5
0.5
1.0
0.0
Output Curren2 I
OUT2
(mA)
0
50
85
C
25
C
-40
C
150
250
200
300
100
Output V
oltage2 V
OUT2
(V)
V
IN
=4.3V
2)
Output Voltage vs. Input Voltage
(Topt=25
C)
VR1
VR2
R5102V001A
R5102V001A
3.0
2.9
2.8
2.7
2.6
Input Voltage V
IN
(V)
2.0
3.5
3.0
2.5
10mA
100mA
4.5
5.5
5.0
6.0
4.0
Output V
oltage V
OUT1
(V)
1mA
3.5
3.4
3.3
3.2
3.1
Input Voltage V
IN
(V)
3.0
3.5
10mA
30mA
4.5
5.5
5.0
6.0
4.0
Output V
oltage V
OUT2
(V)
I
OUT
=0mA
3)
Dropout Voltage vs. Output Current
VR1
VR2
R5102V001A
R5102V001A
0.30
0.50
0.40
0.20
0.10
0.00
Output Current1 I
OUT1
(mA)
0
100
25
C
300
400
500
200
Dropout V
oltage1 V
DIF1
(V)
V
SET1
=2.8V
-40
C
85
C
0.6
1.0
0.8
0.4
0.2
0.0
Output Current2 I
OUT2
(mA)
0
10
25
C
30
40
50
20
Dropout V
oltage2 V
DIF2
(V)
V
SET2
=3.3V
-40
C
85
C
R5102V
7
4)
Output Voltage vs. Temperature
VR1
VR2
R5102V001A
R5102V001A
2.80
2.90
2.85
2.75
2.70
Temperature Topt (
C)
-50
0
25
50
75
100
-25
Output V
oltage1 V
OUT1
(V)
V
DD
=3.8V, I
OUT1
=10mA
3.30
3.40
3.35
3.25
3.20
Temperature Topt (
C)
-50
0
25
50
75
100
-25
Output V
oltage2 V
OUT2
(V)
V
DD
=4.3V, I
OUT1
=10mA
5)
Supply Current1 vs. Input Voltage
6)
Supply Current2 vs. Input Voltage
R5102V001A
R5102V001A
30
20
10
60
50
40
0
Input Voltage V
IN
(V)
0
2
3
4
5
6
1
Supply Current1 I
SS1
(
A)
Topt=25(
C)
30
20
10
60
50
40
0
Input Voltage V
IN
(V)
0
2
3
4
5
6
1
Supply Current1 I
SS1
(
A)
Topt=25(
C)
7)
Supply Current3 vs. Input Voltage
8)
Supply Current4 vs. Input Voltage
R5102V001A
R5102V001A
5
4
3
2
1
10
9
8
7
6
0
Input Voltage V
IN
(V)
0
2
3
4
5
6
1
Supply Current1 I
SS1
(
A)
Topt=25(
C)
3
2
1
6
5
4
0
Input Voltage V
IN
(V)
0
2
3
4
5
6
1
Supply Current1 I
SS1
(
A)
Topt=25(
C)
R5102V
8
9)
Supply Current1 vs. Temperature
10) Supply Current2 vs. Temperature
R5102V001A
R5102V001A
40
60
50
20
30
10
0
Temperature Topt (
C)
-50
50
100
0
-25
75
25
Supply Current1 (4.2V) I
SS12
(
A)
V
DD
=4.2V,V
CE1
/=V
CE2
/=0V
40
60
50
20
30
10
0
Temperature Topt (
C)
-50
50
100
0
-25
75
25
Supply Current2 I
SS2
(
A)
V
DD
=V
CE2
/=4.2V,V
CE1
/=0V
11) Supply Current3 vs. Temperature
12) Supply Current4 vs. Temperature
R5102V001A
R5102V001A
10
1
2
3
4
5
6
7
8
9
0
Temperature Topt (
C)
-50
50
100
0
-25
75
25
Supply Current3 I
SS3
(
A)
V
DD
=V
CE1
/=4.2V,V
CE2
/=0V
0
1
2
3
4
5
6
Temperature Topt (
C)
-50
50
100
0
-25
75
25
Supply Current4 I
SS4
(
A)
V
DD
=V
CE1
/=4.2V,V
CE2
/=0V
13) Ripple Rejection vs. Frequency
VR1
VR2
R5102V001A
R5102V001A
80
10
20
30
40
50
60
70
0
Frequency f(kHz)
0.01
1
10
0.1
Ripple Rejection RR1(dB)
V
IN
=3.8V
DC
+0.5V
PP
,I
OUT1
=50mA C
L
=4.7
F
80
10
20
30
40
50
60
70
0
Frequency f(kHz)
0.01
1
10
0.1
Ripple Rejection RR2(dB)
V
IN
=4.3V
DC
+0.5V
PP
,I
OUT2
=10mA C
L
=1.0
F
R5102V
9
14) WDT Reset and Watchdog Timeout Periods vs. External Capacitance (Topt=25
C)
R5102V001A
CTWExternal Capacitance (
F)
1E-4
1E+5
1E+4
1E+3
1E+2
1E+1
1E+0
1E-1
1E-3
1E-2
1E-1
1E-0
W
atchdog/Reset
T
imeout Periods twd,twr (ms)
twr
twd
R5102V
10
TIMING DIAGRAM
V
DD
R
OUT1
V
CE1
V
ref2H
V
CTW
V
ref2L
V
RESET
V
SCK
T
WD
T
SCKW
T
WR
Vstart
1 2 3
4
4
5
6
5
6
4
4
7
8
4
4
4
9
R5102V
11
OPERATION
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APPLICATION NOTES
Phase Compensation
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TYPICAL APPLICATION
3
EXT
8
CE2
5
SCK
6
R
ESET
1
V
DD
10 GND
2
R
OUT2
9
CE1
4
R
OUT1
7
CTW
Watchdog
Timer
Voltage
Regulator1
Voltage
Regulator2
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