S-8337AAAA-P8T1G Datasheet, PDF (29/51 Pages) Seiko Instruments Inc – SWITCHING REGULATOR CONTROLLER

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.0_01
S-8337/8338 Series
3. Example of External Parts Dependence Characteristics
1600
1400
1200
1000
fOSC
[kHz]
800
600
400
200
0
0
fOSC vs. ROSC (VIN = 3.3 V)
Ta = –40°C
Ta = 25°C
Ta = 85°C
100 200 300 400 500 600
ROSC [kΩ]
100
90
80
70
MaxDuty ⁶⁰
[%]
50
40
30
20
10
0
MaxDuty vs. R_Duty/R_OSC (R_OSC = 200 kΩ, V_IN = 3.3 V)
Ta = –40°C
Ta = 25°C
Ta = 85°C
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
RDuty/ROSC
tPRO vs. CSP (VIN = 3.3 V)
350
300
250
tPRO 200
[ms] ₁₅₀
100
50
0
0
Ta = –40°C
Ta = 25°C
Ta = 85°C
0.1 0.2 0.3 0.4 0.5
CSP [μF]
1600
1400
1200
fOSC vs. ROSC (VIN = 5.0 V)
Ta = –40°C
Ta = 25°C
Ta = 85°C
1000
fOSC
[kHz]
800
600
400
200
0
0 100 200 300 400 500 600
ROSC [kΩ]
100
90
80
70
MaxDuty ⁶⁰
[%]
50
40
30
20
10
0
MaxDuty vs. R_Duty/R_OSC (R_OSC = 200 kΩ, V_IN = 5.0 V)
Ta = –40°C
Ta = 25°C
Ta = 85°C
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
RDuty/ROSC
tPRO vs. CSP (VIN = 5.0 V)
350
300
250
tPRO 200
[ms] ₁₅₀
100
50
0
0
Ta = –40°C
Ta = 25°C
Ta = 85°C
0.1 0.2 0.3 0.4 0.5
CSP [μF]
29