S-8550AA-M5T1X Datasheet, PDF (20/31 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
 Reference Data
1. Reference data for external parts
Table 9 Properties of External Parts
Element Name
Inductor
Input capacitor
Output capacitor
Product Name
NR4018T3R3M
C3216X7R1E475K
C3216X7R1C106K
Manufacture
Taiyo Yuden Co., Ltd
TDK Corporation
TDK Corporation
Characteristics
3.3 μH, DCRMAX = 0.07 Ω, IMAX = 1.23 A
4.7 μF
10 μF
Caution The values of the external parts are based on the materials provided by each manufacturer. However,
consider the characteristics of the original materials when using the above products.
2. Output current (IOUT) vs. Efficiency (η) Characteristics and Output current (IOUT) vs. Output voltage (VOUT) Characteristics
2. 1 VOUT = 1.1 V (RFB1 = 36 kΩ, RFB2 = 43 kΩ)
(1) Output current (IOUT) vs. Efficiency (η)
100
90 _{VIN = 2.0 V}
80
70
60
VIN = 3.6 V
VIN = 5.5 V
50
40
30
20
10
0
0
1
10
100 1000
IOUT [mA]
(2) Output current (IOUT) vs. Output voltage (VOUT)
1.3
VIN = 5.5 V
1.2 VIN = 3.6 V
VIN = 2.0 V
1.1
1.0
0.9
0
1
10
100 1000
IOUT [mA]
2. 2 VOUT = 1.8 V (RFB1 = 36 kΩ, RFB2 = 18 kΩ)
(1) Output current (IOUT) vs. Efficiency (η)
100
90
VIN = 2.2 V
80
70
60
VIN = 3.6 V
VIN = 5.5 V
50
40
30
20
10
0
0
1
10
100 1000
IOUT [mA]
(2) Output current (IOUT) vs. Output voltage (VOUT)
2.0
VIN = 5.5 V
1.9 VIN = 3.6 V
VIN = 2.0 V
1.8
1.7
1.6
0
1
10
100 1000
IOUT [mA]
20