S-8363B-I6T1U2 Datasheet, PDF (18/50 Pages) Seiko Instruments Inc – PWM/PFM SWITCHABLE SWITCHING REGULATOR

STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
S-8363 Series
Rev.2.0_01
 External Parts Selection
1. Inductor
The recommended L value of the S-8363 Series is 2.2 μH.
Caution
When selecting an inductor, be careful about its allowable current. If a current exceeding the
allowable current flows through the inductor, magnetic saturation occurs, substantially lowering
the efficiency and destroying ICs due to large current. Therefore, select an inductor such that IPK
does not exceed the allowable current. The following equations express IPK in the ideal statuses
in the discontinuous and continuous modes :
IPK =
IPK =
2 × IOUT × (VOUT + VD^*2 − VIN)
fOSC^*1 × L
VOUT + VD^*2
VIN
× IOUT +
(VOUT + VD^*2 − VIN) × VIN
2 × (VOUT + VD^*2) × fOSC^*1 × L
(Discontinuous mode)
(Continuous mode)
*1. fOSC : oscillation frequency
*2. VD is the forward voltage of a diode. The reference value is 0.4 V.
However, current exceeding the above equation flows because conditions are practically not ideal.
Perform sufficient evaluation with actual application.
Manufacturer
TDK Corporation
Coilcraft, Inc
Murata Manufacturing
Co., Ltd.
TAIYO YUDEN Co., Ltd.
Table 9 Typical Inductors
Name
VLF302510-2R2M
VLS3010T-2R2M
VLS201610E
MLP2012S2R2M
LPS3010-222ML
LQM2HPN2R2MG0
LQH3NPN2R2NG0
NR3010T2R2M
NR4010T2R2N
BRL2518T2R2M
L value
2.2 μH
2.2 μH
2.2 μH
2.2 μH
2.2 μH
2.2 μH
2.2 μH
2.2 μH
2.2 μH
2.2 μH
Direct resistor Rated current
0.084 Ω max. 1.23 A max.
0.116 Ω max. 1.2 A max.
0.276 Ω max. 0.94 A max.
0.300 Ω max. 0.8 A max.
0.220 Ω max. 1.3 A max.
0.080 Ω±25% 1.3 A max.
0.140 Ω±20% 1.25 A max.
0.114 Ω max. 1.1 A max.
0.180 Ω max. 1.15 A max.
0.1755 Ω max. 0.85 A max.
Size (L × W × H）[mm]
3.0 × 2.5 × 1.0
3.0 × 3.0 × 1.0
2.0 × 1.6 × 0.95
2.0 × 1.25 × 1.0
3.0 × 3.0 × 1.0
2.5 × 2.0 × 1.0
2.7 × 3.0 × 1.0
3.0 × 3.0 ×1.0
4.0 × 4.0 ×1.0
2.5 × 1.8 × 1.2
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