S-8550AA-M5T1X Datasheet, PDF (21/31 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
2. 3 VOUT = 3.3 V (RFB1 = 36 kΩ, RFB2 = 8 kΩ)
(1) Output current (IOUT) vs. Efficiency (η)
100
90 _{VIN = 3.7 V}
80
70
VIN = 5.5 V
60
50
40
30
20
10
0
0
1
10
100 1000
IOUT [mA]
2. 4 VOUT = 4.0 V (RFB1 = 51 kΩ, RFB2 = 9 kΩ)
(1) Output current (IOUT) vs. Efficiency (η)
100
90 _{VIN = 4.4 V}
80
70
VIN = 5.5 V
60
50
40
30
20
10
0
0
1
10
100 1000
IOUT [mA]
(2) Output current (IOUT) vs. Output voltage (VOUT)
3.5
VIN = 5.5 V
3.4 VIN = 3.7 V
3.3
3.2
3.1
0
1
10
100 1000
IOUT [mA]
(2) Output current (IOUT) vs. Output voltage (VOUT)
4.2
VIN = 5.5 V
4.1 VIN = 4.4 V
4.0
3.9
3.8
0
1
10
100 1000
IOUT [mA]
3. Output current (IOUT) vs. Ripple voltage (Vr) Characteristics
3. 1 VOUT = 1.1 V (RFB1 = 36 kΩ, RFB2 = 43 kΩ)
(1) VIN = 3.6 V
50
40
30
20
10
0
0
1
10
100
IOUT [mA]
1000
(2) VIN = 5.5 V
50
40
30
20
10
0
0
1
10
100
IOUT [mA]
1000
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