STEP-DOWN, 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8540/8541 Series
Rev.4.0_00
32 Seiko Instruments Inc.
2. Ripple Voltage (V
rip
) − Output Current (I
OUT
) Characteristics
2. 1 S-8540A33FN 2. 2 S-8541A33FN
0
20
40
60
80
100
1 10 100 1000
Ri
le
mV
3.3 V, 600 kHz, PWM control
5.0 V
7.2 V
I
OUT
(mA)
V
IN
=4.0 V
0
20
40
60
80
100
1 10 100 1000
Ripple
(mV)
5.0 V
.2 V
(3.3 V, 600 kHz, PWM/PFM control)
I
OUT
(mA)
V
IN
4.0 V
2. 3 S-8540A18FN
2. 4 S-8541A18FN
0
20
40
60
80
100
1 10 100 1000
Ripple
(mV)
(1.8 V, 600 kHz, PWM control)
3.6 V
5.0 V
I
OUT
(mA)
V
IN
=2.5 V
0
20
40
60
80
100
1 10 100 1000
Ripple
(mV)
3.6 V
5.0 V
(1.8 V, 600 kHz, PWM/PFM control)
I
OUT
(mA)
V
IN
2.5 V
2. 5 S-8540C33FN
2. 6 S-8541C33FN
0
20
40
60
80
100
1 10 100 1000
Ripple
(mV)
(3.3 V, 600 kHz, PWM control)
3.6 V
5.0 V
I
OUT
(mA)
V
IN
2.5 V
0
20
40
60
80
100
1 10 100 1000
Ripple
(mV)
3.6 V
5.0 V
(3.3 V, 600 kHz, PWM/PFM control)
I
OUT
(mA)
V
IN
=2.5 V
2. 7 S-8540C18FN
2. 8 S-8541C18FN
0
20
40
60
80
100
1 10 100 1000
Ri
le
mV
1.8 V, 300 kHz, PWM control
3.6 V
5.0 V
I
OUT
(mA)
V
IN
=2.5 V
0
20
40
60
80
100
1 10 100 1000
Ripple
(mV)
3.6 V
5.0 V
(1.8 V, 300 kHz, PWM/PFM control)
I
OUT
(mA)
V
IN
=2.5 V
