S-9365AAAAAI6TIG2 SII [Seiko Instruments Inc], S-9365AAAAAI6TIG2 Datasheet - Page 20

• Manufacturer Part Number: S-9365AAAAAI6TIG2
• Description: STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
• Manufacturer: SII [Seiko Instruments Inc]

20
TDK Corporation
Coilcraft, Inc.
Taiyo Yuden Co., Ltd.
Sumida Corporation
TDK Corporation
Coilcraft, Inc.
Taiyo Yuden Co., Ltd.
S-8365/8366 Series
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
External Parts Selection
1. Inductor
The recommended L value of the S-8365/8366 Series is 2.2 µH for 1.2 MHz products and 3.3 µH for 600 kHz
products.
Note the following when changing the inductance.
The inductance (L) has a strong influence on the maximum output current (I
The inductor peak current (I
the I
insufficient, reducing the efficiency and decreasing I
The loss due to the I
certain L value. If L is increased further, the loss due to the serial resistance of the inductor increases, lowering the
efficiency.
Caution When selecting an inductor, be careful about its allowable current. If a current exceeding the
Manufacture
Manufacture
OUT
users can obtain. If L is decreased further, the ability of the external transistor to drive the current becomes
I
I
*1.
*2.
PK
PK
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 I
does not exceed the allowable current. The following equations express I
in the discontinuous and continuous modes :
=
=
f
V
However, current exceeding the above equation flows because conditions are practically not ideal.
Perform sufficient evaluation with actual application.
OSC
V
D
OUT
is the forward voltage of a diode. The reference value is 0.4 V.
: oscillation frequency
2 × I
Table 14 Typical Inductors (for Large Current, High Step-up Rate)
V
+ V
IN
PK
NR6028T2R2M
VLF3010ST-2R2M
VLF3010ST-3R3M
VLS252010-2R2M
VLS252010-3R3M
LPS3008-222ML
LPS3008-332ML
NR3010T2R2M
NR3010T3R3M
CDRH2D11BNP-2R2N
CDRH2D11BNP-3R3N
LTF5022T-2R2M
LTF5022T-3R3M
LPS6225-222ML
LPS6225-332ML
Table 13 Typical Inductors (for Small Low-Profile Devices)
OUT
D
of the switching transistor is decreased by increasing L and the efficiency maximizes at a
*2
Product Name
Product Name
× (V
f
× I
OSC
PK
) increases when L is decreased, which improves the circuit stability and increases
OUT
OUT
*1
× L
+ V
+
2 × (V
D
*2
(V
− V
OUT
OUT
Seiko Instruments Inc.
IN
)
+ V
+ V
L Value
L Value
2.2 µH
3.3 µH
2.2 µH
3.3 µH
2.2 µH
3.3 µH
2.2 µH
3.3 µH
2.2 µH
3.3 µH
2.2 µH
3.3 µH
2.2 µH
3.3 µH
2.2 µH
D
*2
D
*2
− V
OUT
) × f
.
IN
) × V
OSC
DC Resistance
DC Resistance
0.0955 Ω max.
0.092 Ω max.
0.130 Ω max.
0.190 Ω max.
0.304 Ω max.
0.175 Ω max.
0.285 Ω max.
0.114 Ω max.
0.168 Ω max.
0.154 Ω max.
0.040 Ω max.
0.060 Ω max.
0.045 Ω max.
0.055 Ω max.
0.020 Ω max.
*1
IN
× L
(Discontinuous mode)
(Continuous mode)
0.88 A max.
0.88 A max.
0.87 A max.
1.1 A max.
1.2 A max.
1.0 A max.
1.1 A max.
1.1 A max.
1.4 A max.
1.0 A max.
3.4 A max.
2.7 A max.
4.1 A max.
3.6 A max.
4.2 A max.
OUT
Current
Current
Rated
Rated
) and efficiency (η).
Dimensions (L × W × H)
Dimensions (L × W × H)
PK
in the ideal statuses
2.8 × 3.0 × 1.0
2.5 × 2.0 × 1.0
2.5 × 2.0 × 1.0
3.0 × 3.0 × 0.8
3.0 × 3.0 × 1.0
3.0 × 3.0 × 1.2
3.0 × 3.0 × 1.2
5.0 × 5.2 × 2.2
5.0 × 5.2 × 2.2
6.0 × 6.0 × 2.4
6.0 × 6.0 × 2.4
6.0 × 6.0 × 2.8
2.8 × 3.0 × 1.0
3.0 × 3.0 × 0.8
3.0 × 3.0 × 1.0
[mm]
[mm]
Rev.1.1
_00
PK