S-8550AA-M5T1X Datasheet, PDF (17/31 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
1. 9 FB voltage (VFB) vs. Input voltage (VIN)
612
608
604
600
596
592
588
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN [V]
2. Example of Major Temperature Characteristics (Ta = −40 to +85°C)
2. 1 Current consumption 1 (ISS1) vs. Temperature (Ta)
500
400
VIN = 5.5 V
VIN = 3.6 V
300
VIN = 2.0 V
200
100
0
−40 −25
0
25 50 75 85
Ta [C]
2. 3 Oscillation frequency (fosc) vs. Temperature (Ta)
1.32
1.28
1.24
VIN = 5.5 V
VIN = 3.6 V
VIN = 2.0 V
1.20
1.16
1.12
1.08
−40 −25
0
25 50
Ta [C]
75 85
2. 2 Current consumption during shutdown (ISSS) vs. Temperature (Ta)
1.0
0.8
VIN = 5.5 V
0.6
VIN = 3.6 V
VIN = 2.0 V
0.4
0.2
0
−40 −25
0
25 50 75 85
Ta [C]
2. 4 Soft-start time (tSS) vs. Temperature (Ta)
1.3
1.2
1.1
1.0
VIN = 5.5 V
0.9
VIN = 3.6 V
0.8
VIN = 2.0 V
0.7
−40 −25
0
25 50
Ta [C]
75 85
2. 5 Power MOS FET on-resistance (RFET) vs. Temperature (Ta)
0.8
Pch
0.7 VIN = 5.5 V
Nch
VIN = 5.5 V
0.6 ^{VIN = 3.6 V}
VIN = 2.0 V
0.5
VIN = 3.6 V
VIN = 2.0 V
0.4
0.3
0.2
−40 −25
0
25 50
Ta [C]
75 85
2. 6 Power MOS FET leakage current (ILSW) vs. Temperature (Ta)
0.5
0.4
0.3
Nch
0.2
0.1
VIN = 5.5 V
0
−0.1
−0.2
−0.3
Pch
VIN = 5.5 V
−0.4
−0.5
−40 −25
0
25 50 75 85
Ta [C]
17