s-8551 Seiko Instruments Inc., s-8551 Datasheet - Page 16

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

16
STEP-DOWN, BUILT-IN FET, SYNCHRONOUS RECTIFICATION, PWM CONTROL SWITCHING REGULATORS
S-8550/8551 Series
2. Example of Major Temperature Characteristics (Ta = −40 to 85°C)
1. 9 FB voltage (V
2. 1 Current consumption 1 (I
2. 3 Oscillation frequency (f
2. 5 Power MOS FET on-resistance (R
1.32
1.28
1.24
1.20
1.16
1.12
1.08
612
608
604
600
596
592
588
500
400
300
200
100
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0
−40
−40
−40
2.0
Pch
V
V
V
−25
−25
−25
IN
IN
IN
2.5
= 5.5 V
= 3.6 V
= 2.0 V
FB
3.0
) vs. Input voltage (V
0
0
0
V
IN
3.5
Ta [°C]
osc
Ta [°C]
Ta [°C]
V
= 5.5 V
V
IN
SS1
Nch
) vs. Temperature (Ta)
25
25
25
IN
V
V
V
[V]
4.0
) vs. Temperature (Ta)
= 3.6 V
IN
IN
IN
FET
V
= 5.5 V
= 3.6 V
= 2.0 V
) vs. Temperature (Ta)
IN
V
V
4.5
IN
= 2.0 V
50
V
50
50
IN
= 5.5 V
IN
= 3.6 V
= 2.0 V
5.0
Seiko Instruments Inc.
IN
)
75 85
75 85
75 85
5.5
2. 2 Current consumption during shutdown (I
2. 4 Soft-start time (t
2. 6 Power MOS FET leakage current (I
−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
0
−40
−40
−40
−25
−25
−25
SS
0
) vs. Temperature (Ta)
0
0
Ta [°C]
Ta [°C]
Ta [°C]
25
25
25
LSW
Nch
Pch
V
V
) vs. Temperature (Ta)
SSS
IN
V
IN
V
) vs. Temperature (Ta)
V
IN
V
= 5.5 V
IN
= 5.5 V
50
50
50
V
IN
V
IN
= 2.0 V
= 5.5 V
IN
IN
= 3.6 V
Rev.2.1
= 3.6 V
= 5.5 V
= 2.0 V
75 85
75 85
75 85
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