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| S-8550 Datasheet, PDF (15/26 Pages) Seiko Instruments Inc – STEP-DOWN, BUILT-IN FET, SYNCHRONOUS RECIFICATION, PWM CONTROL SWITCHING REGULATORS | |||
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STEP-DOWN, BUILT-IN FET, SYNCHRONOUS RECTIFICATION, PWM CONTROL SWITCHING REGULATORS
Rev.2.1_01
S-8550/8551 Series
 Characteristics (Typical Data)
1. Example of Major Power Supply Dependence Characteristics (Ta = 25°C)
1. 1 Current consumption 1 (ISS1) vs. Input voltage (VIN)
500
400
300
200
100
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN [V]
1. 2 Current consumption during shutdown (ISSS) vs. Input voltage (VIN)
1.0
0.8
0.6
0.4
0.2
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN [V]
1. 3 Oscillation frequency (fosc) vs. Input voltage (VIN)
1.38
1.34
1.30
1.26
1.22
1.18
1.14
1.10
1.06
1.02
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN [V]
1. 4 Soft-start time (tSS) vs. Input voltage (VIN)
1.3
1.2
1.1
1.0
0.9
0.8
0.7
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN [V]
1. 5 Power MOS FET on-resistance (RFET) vs. Input voltage (VIN)
0.8
0.7
0.6
0.5
0.4
Pch
0.3
Nch
0.2
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN [V]
1. 6 Power MOS FET leakage current (ILSW) vs. Input voltage (VIN)
0.5
0.4
0.3
0.2
0.1
Pch
0
â0.1
â0.2
Nch
â0.3
â0.4
â0.5
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN [V]
1. 7 ON/OFF pin input voltageâHâ (VSH) vs. Input voltage (VIN)
0.9
0.8
0.7
0.6
0.5
0.4
0.3
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN [V]
1. 8 ON/OFF pin input voltageâLâ (VSL) vs. Input voltage (VIN)
0.9
0.8
0.7
0.6
0.5
0.4
0.3
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN [V]
Seiko Instruments Inc.
15
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