s-8337aaca-t8t1g Seiko Instruments Inc., s-8337aaca-t8t1g Datasheet - Page 28

• Manufacturer Part Number: s-8337aaca-t8t1g
• Description: Step-up, 1.2 Mhz High-frequency, Pwm Control Switching Regulator Controller
• Manufacturer: Seiko Instruments Inc.

28
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series
f
[kHz]
MaxDuty
[%]
t
[ms]
OSC
PRO
3. Example of External Parts Dependence Characteristics
1600
1400
1200
1000
800
600
400
200
100
350
300
250
200
150
100
90
80
70
60
50
40
30
20
10
50
0
0
0
0
0
0 0.5 1 1.5 2 2.5 3 3.5
MaxDuty vs. R
100
0.1
f
t
OSC
PRO
200
Duty
vs. R
vs. CSP (V
/R
0.2
R
OSC
CSP [μF]
R
OSC
OSC
Duty
300
(R
OSC
/R
(V
[kΩ]
0.3
OSC
IN
IN
= 200 kΩ, V
400
= 3.3 V)
= 3.3 V)
Ta = –40°C
Ta = 25°C
Ta = 85°C
Ta = –40°C
Ta = 25°C
Ta = 85°C
Ta = –40°C
Ta = 25°C
Ta = 85°C
0.4
Seiko Instruments Inc.
4 4.5 5
500
IN
= 3.3 V)
600
0.5
MaxDuty
[%]
f
[kHz]
t
[ms]
OSC
PRO
1600
1400
1200
1000
100
800
600
400
200
350
300
250
200
150
100
90
80
70
60
50
40
30
20
10
50
0
0
0
0 0.5 1 1.5 2 2.5 3 3.5
0
0
MaxDuty vs. R
100
0.1
t
f
PRO
OSC
200
Duty
vs. CSP (V
vs. R
/R
0.2
OSC
R
CSP [μF]
R
OSC
Duty
OSC
300
(R
OSC
/R
[kΩ]
(V
OSC
0.3
= 200 kΩ, V
IN
IN
400
= 5.0 V)
= 5.0 V)
Ta = –40°C
Ta = 25°C
Ta = 85°C
Ta = –40°C
Ta = 25°C
Ta = 85°C
Ta = –40°C
Ta = 25°C
Ta = 85°C
0.4
4 4.5 5
500
IN
Rev.3.1
= 5.0 V)
600
0.5
_00