s-8337aaca-t8t1g Seiko Instruments Inc., s-8337aaca-t8t1g Datasheet - Page 26

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

26
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series
I
[mA]
I
[μA]
MaxDuty
[%]
I
[μA]
SS1
EXTH
FB
2. Example of Major Power Supply Dependence Characteristics (Ta = 25 ° C)
–0.02
–0.04
–0.06
–0.08
–0.10
1200
1000
–200
–180
–160
–140
–120
–100
0.10
0.08
0.06
0.04
0.02
800
600
400
200
–80
–60
–40
–20
100
90
80
70
60
50
40
30
20
10
0
0
0
0
0
0
0
0
f
(R
f
(R
f
(R
OSC
OSC
OSC
MaxDuty = 88.5%
(R
OSC
OSC
OSC
= 1133 kHz
= 700 kHz
= 286 kHz
OSC
f
OSC
= 120 kΩ)
= 200 kΩ)
= 510 kΩ)
1
1
1
1
= 200 kΩ, R
= 700 kHz, MaxDuty = 77% (R
MaxDuty = 47%
(R
OSC
2
2
2
2
Duty
= 200 kΩ, R
MaxDuty vs. V
= 100 kΩ)
I
EXTH
I
I
3
3
FB
SS1
3
3
V
V
V
V
IN
IN
IN
IN
vs. V
Duty
vs. V
vs. V
[V]
[V]
[V]
[V]
= 820 kΩ)
MaxDuty = 77%
(R
4
4
4
4
OSC
OSC
IN
IN
IN
= 200 kΩ, R
= 200 kΩ, R
IN
5
5
5
5
Seiko Instruments Inc.
Duty
Duty
= 300 kΩ)
= 300 kΩ)
6
6
6
6
7
7
7
7
I
[μA]
I
[mA]
f
[kHz]
t
[ms]
SSS
OSC
EXTL
SS
1400
1200
1000
25.0
20.0
15.0
10.0
200
180
160
140
120
100
800
600
400
200
5.0
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
80
60
40
20
0
0
0
0
0
0
0
0
f
f
f
OSC
OSC
OSC
f
OSC
= 700 kHz (R
= 286 kHz (R
= 1133 kHz (R
1
1
1
1
= 700 kHz, MaxDuty = 77% (R
2
2
2
2
f
OSC
f
I
I
OSC
EXTL
OSC
OSC
SSS
t
SS
3
3
3
3
= 700 kHz (R
OSC
V
V
V
V
t
= 510 kΩ)
= 200 kΩ)
IN
IN
IN
IN
vs. V
SS
vs. V
vs. V
= 120 kΩ)
vs. V
[V]
[V]
[V]
[V]
= 10 ms
4
4
4
4
OSC
IN
IN
IN
IN
= 200 kΩ, R
t
SS
OSC
5
5
5
5
= 20 ms
= 200 kΩ)
Duty
Rev.3.1
= 300 kΩ)
6
6
6
6
7
7
7
7
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