S-8351C30UA-J6PT2G Seiko Instruments, S-8351C30UA-J6PT2G Datasheet - Page 18
![IC REG SW 100KHZ 3.0V SOT89-3](/photos/12/63/126323/s-812c50aua-c3et2g_sml.jpg)
S-8351C30UA-J6PT2G
Manufacturer Part Number
S-8351C30UA-J6PT2G
Description
IC REG SW 100KHZ 3.0V SOT89-3
Manufacturer
Seiko Instruments
Type
Step-Up (Boost)r
Datasheet
1.S-8351A22MC-J2HT2G.pdf
(51 pages)
Specifications of S-8351C30UA-J6PT2G
Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
3V
Frequency - Switching
100kHz
Voltage - Input
0.9 ~ 10 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
SC-62, SOT-89, TO-243 (3 Leads + Tab)
Power - Output
500mW
Output Voltage
3 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
18
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
S-8351/8352 Series
3. Operation
The following are the basic equations [(1) through (7)] of the step-up switching regulator. (Refer to Figure 18.)
Voltage at CONT pin at the moment M1 is turned ON (V
The change in I
Integration of equation (2) (I
I
The peak current (I
The energy stored in L is represented by 1/2 • L (I
When M1 is turned OFF (t
Then, the reverse voltage (V
The voltage at CONT pin rises only by V
The change in the current (I
L
flows while M1 is ON (t
V
I
I
dI
L
PK
V
dI
dt
dt
A
L
L
L
=
= V
*1. Current flowing through L (I
*2. Non-saturated voltage of M1.
*1. Diode forward voltage
=
= (V
⎛
⎜
⎝
=
=
⎛
⎜
⎝
V
V
V
S
L
IN
V
L
OUT
L
L
*2
IN
L
−
=
=
L
−
V
+ V
L
V
V
V
S
OUT
over time :
IN
S
⎞
• ⎟
⎠
⎞
• ⎟
⎠
L
D
−
PK
*1
t
V
+
) after t
) − V
t
ON
S
L
V
Figure 18 Step-Up Switching Regulator Circuit for Basic Equation
D
ON
VIN
−
IN
OFF
). The time of t
V
L
L
ON
L
) :
) flowing through the diode into V
IN
), the energy stored in L is emitted through a diode to the output capacitor.
) is generated :
:
ON
OSC
/
L
OFF
L
) is zero.
OUT
Seiko Instruments Inc.
ON
+
V
is determined by the oscillation frequency of OSC.
D
.
PK
CONT
M1
)
2
.
A
)
Di
*1
:
OUT
during t
VOUT
OFF
:
+
−
+
−
C
L
Rev.3.0
(1)
(2)
(3)
(4)
(5)
(6)
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