S-8550AA-M5T1X Datasheet, PDF (19/31 Pages) Seiko Instruments Inc – RECTIFICATION, PWM CONTROL SWITCHING REGULATORS

STEP-DOWN, BUILT-IN FET, SYNCHRONOUS RECTIFICATION, PWM CONTROL SWITCHING REGULATORS
Rev.5.0_01
S-8550 Series
3. 3 Power supply fluctuations (VOUT = 1.8 V, Ta = +25°C)
(1) IOUT = 1 mA, VIN = 2.6 V → 3.6 V → 2.6 V
4.5
3.5
VIN
2.5
2.2
1.5
2.0
0.5
1.8
VOUT
1.6
1.4
−0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
t [ms]
(2) IOUT = 600 mA, VIN = 2.6 V → 3.6 V → 2.6 V
4.5
3.5
VIN
2.5
2.2
1.5
2.0
0.5
1.8
VOUT
1.6
1.4
−0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
t [ms]
3. 4 Load fluctuations (VOUT = 1.8 V, VIN = 3.6 V, Ta = +25°C)
(1) IOUT = 0.1 mA → 100 mA → 0.1 mA
400
300
IOUT
200
100
1.90
0
1.85
1.80
VOUT
−100
1.75
1.70
−0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
t [ms]
(2) IOUT = 0.1 mA → 300 mA → 0.1 mA
IOUT
1.90
1.85
1.80
VOUT
1.75
1.70
−0.1 0 0.1 0.2 0.3 0.4 0.5 0.6
t [ms]
400
300
200
100
0
−100
0.7
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