S-8550AA-M5T1X Datasheet, PDF (18/31 Pages) Seiko Instruments Inc – RECTIFICATION, PWM CONTROL SWITCHING REGULATORS

STEP-DOWN, BUILT-IN FET, SYNCHRONOUS RECTIFICATION, PWM CONTROL SWITCHING REGULATORS
S-8550 Series
Rev.5.0_01
2. 7 ON/OFF pin input voltage“H” (VSH) vs. Temperature (Ta)
0.9
0.8
0.7
0.6
VIN = 3.6 V
VIN = 5.5 V
0.5
VIN = 2.0 V
0.4
0.3
−40 −25
0
25 50 75 85
Ta [C]
2. 9 UVLO detection voltage (VUVLO) vs. Temperature (Ta)
1.80
1.75
1.70
1.65
1.60
1.55
1.50
1.45
1.40
−40 −25
0
25 50 75 85
Ta [C]
2. 8 ON/OFF pin input voltage“L” (VSL) vs. Temperature (Ta)
0.9
0.8
VIN = 5.5 V
VIN = 3.6 V
0.7
VIN = 2.0 V
0.6
0.5
0.4
0.3
−40 −25
0
25 50 75 85
Ta [C]
2. 10 FB voltage (VFB) vs. Temperature (Ta)
612
VIN = 5.5 V
608
VIN = 3.6 V
604
VIN = 2.0 V
600
596
592
588
−40 −25
0
25 50
Ta [C]
75 85
3. Examples of Transient Response Characteristics
(Unless otherwise specified, the used parts are ones shown in  External Parts When Measuring Electrical Characteristics.)
3. 1 Powering ON (VOUT = 1.8 V, VIN = 0 V → 3.6 V, Ta = +25°C)
(1) IOUT = 1 mA
4
3
VIN
2
1
VOUT
0
0.6
−1
0.4
IL
0.2
0
−0.2
−0.2 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
t [ms]
(2) IOUT = 600 mA
4
3
VIN
2
1
VOUT
0
1.5
−1
1.0
IL
0.5
0
−0.5
−0.2 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
t [ms]
3. 2 Shutdown pin response (VOUT = 1.8 V, VIN = 3.6 V, VON/OFF = 0 V → 3.6 V, Ta = +25°C)
(1) IOUT = 1 mA
4
3
VON/OFF
2
1
VOUT
0
0.6
−1
0.4
IL
0.2
0
−0.2
−0.2 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
t [ms]
(2) IOUT = 600 mA
4
3
VON/OFF
2
1
VOUT
0
1.5
−1
1.0
IL
0.5
0
−0.5
−0.2 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
t [ms]
18