S-8353A20MC-IQFT2X Datasheet, PDF (28/49 Pages) Seiko Instruments Inc – BUILT-IN TRANSISTOR SWITCHING REGULATOR

STEP-UP, PWM CONTROL or PWM / PFM SWITCHABLE BUILT-IN TRANSISTOR SWITCHING REGULATOR
S-8353/8354 Series
Rev.3.0_01
(6) Oscillation Frequency (fOSC) vs. Temperature (Ta)
fOSC = 50 kHz
70
350
fOSC = 250 kHz
60
300
50
250
40
200
30
−40 −20 0
20 40 60 80 100
Ta [°C]
150
−40 −20 0 20 40 60 80 100
Ta [°C]
(7) Maximum Duty Ratio (MaxDuty) vs. Temperature (Ta)
fOSC = 50 kHz
100
fOSC = 250 kHz
100
90
90
80
80
70
70
60
60
50
−40 −20 0 20 40 60 80 100
Ta [°C]
50
−40 −20 0 20 40 60 80 100
Ta [°C]
(8) PWM / PFM Switching Duty Ratio (PFMDuty) vs.
Temperature (Ta) (S-8354 Series)
(9) ON / OFF Pin Input Voltage “H” (VSH) vs.
Temperature (Ta)
fOSC = 250 kHz
25
20
15
10
5
−40 −20 0 20 40 60 80 100
Ta [°C]
fOSC = 250 kHz
1.0
0.8
0.6
0.4
0.2
0
−40 −20 0
20 40 60 80 100
Ta [°C]
(10) ON / OFF Pin Input Voltage “L” 1 (VSL1) vs.
Temperature (Ta) (S-8354 Series)
fOSC = 250 kHz
1.0
0.8
0.6
0.4
0.2
0
−40 −20 0 20 40 60 80 100
Ta [°C]
(11) ON / OFF Pin Input Voltage “L” 2 (VSL2) vs.
Temperatuer (Ta)
fOSC = 250 kHz
1.0
0.8
0.6
0.4
0.2
0
−40 −20 0 20 40 60 80 100
Ta [°C]
28