s-8551 Seiko Instruments Inc., s-8551 Datasheet - Page 15

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

STEP-DOWN, BUILT-IN FET, SYNCHRONOUS RECTIFICATION, PWM CONTROL SWITCHING REGULATORS
Rev.2.1
Characteristics (Typical Data)
1. Example of Major Power Supply Dependence Characteristics (Ta = 25°C)
1. 1 Current consumption 1 (I
1. 3 Oscillation frequency (f
1. 5 Power MOS FET on-resistance (R
1. 7 ON/OFF pin input voltage“H” (V
1.38
1.34
1.30
1.26
1.22
1.18
1.14
1.10
1.06
1.02
500
400
300
200
100
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.9
0.8
0.7
0.6
0.5
0.4
0.3
_01
0
2.0
2.0
2.0
2.0
2.5
2.5
2.5
2.5
3.0
3.0
3.0
3.0
3.5
3.5
3.5
3.5
V
osc
V
V
V
Pch
Nch
SS1
IN
IN
IN
IN
) vs. Input voltage (V
[V]
[V]
[V]
[V]
4.0
4.0
4.0
SH
4.0
) vs. Input voltage (V
FET
) vs. Input voltage (V
) vs. Input voltage (V
4.5
4.5
4.5
4.5
5.0
5.0
5.0
5.0
Seiko Instruments Inc.
5.5
5.5
5.5
5.5
IN
IN
)
IN
)
)
IN
)
1. 2 Current consumption during shutdown (I
1. 4 Soft-start time (t
1. 6 Power MOS FET leakage current (I
1. 8 ON/OFF pin input voltage“L” (V
−0.1
−0.2
−0.3
−0.4
−0.5
1.0
0.8
0.6
0.4
0.2
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.5
0.4
0.3
0.2
0.1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0
0
2.0
2.0
2.0
2.0
2.5
2.5
2.5
2.5
3.0
3.0
3.0
3.0
SS
) vs. Input voltage (V
3.5
3.5
3.5
3.5
S-8550/8551 Series
V
V
V
V
Pch
Nch
IN
IN
IN
SL
IN
) vs. Input voltage (V
[V]
[V]
[V]
[V]
LSW
4.0
4.0
4.0
4.0
SSS
) vs. Input voltage (V
) vs. Input voltage (V
4.5
4.5
4.5
4.5
5.0
5.0
5.0
5.0
IN
)
IN
5.5
5.5
5.5
5.5
)
IN
IN
)
15
)