s-8551 Seiko Instruments Inc., s-8551 Datasheet - Page 20

• Manufacturer Part Number: s-8551
• Description: Step-down, Built-in Fet, Synchronous Rectification, Pwm Control Switching Regulators
• Manufacturer: Seiko Instruments Inc.

20
STEP-DOWN, BUILT-IN FET, SYNCHRONOUS RECTIFICATION, PWM CONTROL SWITCHING REGULATORS
S-8550/8551 Series
3. Output current (I
2. 3 V
2. 4 V
3. 1 V
(1)
(1)
(1) V
100
100
90
80
70
60
50
40
30
20
10
90
80
70
60
50
40
30
20
10
50
40
30
20
10
Output current (I
0
Output current (I
0
0
OUT
OUT
OUT
IN
0
0
0
= 3.6 V
= 3.3 V (R
= 4.0 V (R
= 1.1 V (R
V
V
V
V
IN
IN
IN
IN
= 3.7 V
= 5.5 V
= 4.4 V
= 5.5 V
1
1
1
FB1
FB1
FB1
OUT
= 36 kΩ, R
= 51 kΩ, R
= 36 kΩ, R
) vs. Ripple voltage (V
OUT
I
OUT
I
I
OUT
OUT
OUT
10
10
10
) vs. Efficiency (η)
) vs. Efficiency (η)
[mA]
[mA]
[mA]
FB2
FB2
FB2
100
100
100
= 8 kΩ)
= 9 kΩ)
= 43 kΩ)
Seiko Instruments Inc.
1000
1000
1000
r
) Characteristics
(2) Output current (I
(2) Output current (I
(2) V
3.5
3.4
3.3
3.2
3.1
4.2
4.1
4.0
3.9
3.8
50
40
30
20
10
IN
0
= 5.5 V
0
0
0
V
V
V
V
IN
IN
IN
IN
= 5.5 V
= 3.7 V
= 5.5 V
= 4.4 V
1
1
1
OUT
OUT
) vs. Output voltage (V
) vs. Output voltage (V
I
I
I
OUT
OUT
OUT
10
10
10
[mA]
[mA]
[mA]
100
100
100
Rev.2.1
1000
1000
1000
OUT
OUT
_01
)
)