s-8551 Seiko Instruments Inc., s-8551 Datasheet - Page 18

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

18
STEP-DOWN, BUILT-IN FET, SYNCHRONOUS RECTIFICATION, PWM CONTROL SWITCHING REGULATORS
S-8550/8551 Series
1.90
1.85
1.80
1.75
1.70
2.2
2.0
1.8
1.6
1.4
3. 3 Power supply fluctuations (V
3. 4 Load fluctuations (V
(1) I
(1) I
−0.1
−0.1
OUT
OUT
0
0
= 0.1 mA → 100 mA → 0.1 mA
= 1 mA, V
V
V
I
V
0.1 0.2
0.1 0.2
OUT
IN
OUT
OUT
t [ms]
t [ms]
IN
0.3
0.3
= 2.6 V → 3.6 V → 2.6 V
OUT
0.4
0.4
= 1.8 V, V
0.5
0.5
OUT
0.6
0.6
= 1.8 V, Ta = 25°C)
IN
= 3.6 V, Ta = 25°C)
0.7
0.7
Seiko Instruments Inc.
4.5
3.5
2.5
1.5
0.5
400
300
200
100
0
−100
(2) I
(2) I
1.90
1.85
1.80
1.75
1.70
2.2
2.0
1.8
1.6
1.4
OUT
OUT
−0.1
−0.1
= 600 mA, V
= 0.1 mA → 300 mA → 0.1 mA
0
0
V
V
I
V
0.1 0.2
0.1 0.2
OUT
IN
OUT
OUT
IN
= 2.6 V → 3.6 V → 2.6 V
t [ms]
t [ms]
0.3
0.3
0.4
0.4
0.5
0.5
Rev.2.1
0.6
0.6
0.7
0.7
4.5
3.5
2.5
1.5
0.5
400
300
200
100
0
−100
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