S-8353 Seiko Instruments, S-8353 Datasheet - Page 27

• Manufacturer Part Number: S-8353
• Description: (S-8353 / S-8354) PWM Control Switchable Built-in Transistor Switching Regulator
• Manufacturer: Seiko Instruments

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Rev.1.4
STEP-UP, PWM CONTROL or PWM / PFM SWITCHABLE BUILT-IN TRANSISTOR SWITCHING REGULATOR
(6) Oscillation Frequency (f
(7) Maximum Duty Ratio (MaxDuty) vs. Temperature (Ta)
(10)
(8) PWM / PFM Switching Duty Ratio (PFMDuty) vs.
_00
100
70
60
50
40
30
ON
90
80
70
60
50
25
20
15
10
1.0
0.8
0.6
0.4
0.2
Temperature (Ta) (S-8354 Series)
−40 −20 0
5
− 40 − 20
Temperature (Ta) (S-8354 Series)
−40 −20
0
−40 −20
/
OFF
Pin Input Voltage “L” 1 (V
0
0
0
Ta [°C]
Ta [°C]
20 40
Ta [ ° C ]
20
20
20
Ta [°C]
40 60 80 100
40 60 80 100
40 60 80 100
f
OSC
OSC
f
OSC
f
f
OSC
OSC
) vs. Temperature (Ta)
60 80 100
= 250 kHz
= 250 kHz
= 50 kHz
= 50 kHz
Seiko Instruments Inc.
SL1
) vs.
(11)
(9)
ON
ON
100
Temperatuer (Ta)
350
300
250
200
150
1.0
0.8
0.6
0.4
0.2
Temperature (Ta)
1.0
0.8
0.6
0.4
0.2
90
80
70
60
50
−40 −20
/
/
0
−40 −20 0
−40 −20 0
0
−40 −20
OFF
OFF
Pin Input Voltage “L” 2 (V
Pin Input Voltage “H” (V
0
0
Ta [°C]
Ta [°C]
Ta [°C]
20
20 40 60 80 100
20 40
Ta [°C]
20 40 60 80 100
S-8353/8354 Series
40
f
f
OSC
f
f
OSC
OSC
OSC
60 80 100
60 80 100
= 250 kHz
= 250 kHz
= 250 kHz
= 250 kHz
SH
SL2
) vs.
) vs.
27