S-8351D40MC-J8ZT2G Seiko Instruments, S-8351D40MC-J8ZT2G Datasheet - Page 22

• Manufacturer Part Number: S-8351D40MC-J8ZT2G
• Description: IC REG SW 100KHZ 4V SOT23-5
• Manufacturer: Seiko Instruments
• Type: Step-Up (Boost)r

Specifications of S-8351D40MC-J8ZT2G

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 4V
• Frequency - Switching: 100kHz
• Voltage - Input: 0.9 ~ 10 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-5, SC-74A, SOT-25
• Power - Output: 250mW
• Output Voltage: 4 V
• Input Voltage: 10 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

22
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
S-8351/8352 Series
4. 2 Bipolar (NPN) Type
A circuit example using the CPH3210 (h
(NPN) is shown in Figure 24 to 26 in the “
transistor determine the driving capacity to increase the output current using a bipolar transistor. A peripheral
circuit example of the transistor is shown in Figure 20.
*1. V
The recommended R
transistor (h
A small R
pulse and the voltage may drop due to wiring resistance or other factors in the actual circuit, therefore the
optimum R
Connecting the speed-up capacitor (C
switching loss and improves the efficiency.
The C
Select a C
characteristics of the bipolar transistor.
*1. For D type,
DD
b
for D type.
value is calculated according to
b
b
b
value can increase the output current, but the efficiency decreases. Since a current may flow on the
FE
value should be determined by experiment.
value after performing sufficient evaluation since the optimum C
) using
R
b
=
b
V
I =
b
DD
value is around 1 kΩ. Actually, calculate the necessary base current (I
I
−
b
h
I
PK
0
FE
7 .
, and select the smaller R
Figure 20 External Transistor Peripheral Circuit
−
I
0
EXTH
4 .
Pch
Nch
Seiko Instruments Inc.
b
.
) in parallel with the R
C
FE
b
VOUT
≤
= 200 to 560) from Sanyo Electric Co., Ltd. as a bipolar transistor
2
π
Standard Circuits”. The h
•
*1
EXT
R
b
•
1
f
osc
b
value than
•
2200 pF
0
1 kΩ
7 .
C
R
b
b
.
b
resistance as shown in Figure 20 , decreases
R
b
=
I
V
PK
OUT
FE
b
I
b
value and R
−
value differs depending upon the
0
7 .
−
I
0
EXTH
4 .
b
value of the bipolar
*1
b
) from the bipolar
.
Rev.3.0
_00