STA820M Series
sExternal
Dimensions (SIP8 [STA 8Pin])
4
±0.2
(Unit : mm)
2.3
±0.2
1.7MAX
9
±0.2
SK
a
b
(1)
STA821M
3.15
±0.5
1.2
±0.1
(Measured at
the root)
2–(R1)
R-END
1.15
+0.2
–0.1
7×P2.54±0.1=(17.78)
(Measured at the root)
C1.5
±0.5
20.15
±0.3
(3.1)
0.55
+0.2
–0.1
4.3
±0.7
(Measured at
the tip)
0.7
0.7
Pin Assignment
q
SW
OUT
w
GND
e
V
IN
r
N.C
t
GND
y
V
OS
u
ON/OFF
i
GND
1
2
3
4
5
6
7
8
Plan View
sBlock
Diagram
STA821M
V
IN
C
1
+
3
V
IN
Internal
Power Supply
SW
OUT
Overcurrent
Protection
Di
1
L
V
OUT
+
C
2
GND
2
Reset
Oscillator
7
ON/OFF
+
Latch &
Driver
Comparator
+
Thermal
Protection
V
OS
6
Error Amplifier
Reference
Voltage
GND
5,8
sTypical
Connection Diagram
L1
V
IN
3.V
IN
1.SW
6.V
OS
V
OUT
sT
a
-P
D
Characteristics
20
With Infinite Heatsink
18
Without Insulating Sheet
With Silicone Grease
Heatsink: Aluminum
Power Dissipation P
D
(W)
STA821M
+
C
1
7.ON/OFF
16
14
12
10
8
6
50×50×2mm (17.9°C/W)
4
2
Without Heatsink (37°C/W)
25×50×2mm
(25°C/W)
2.GND
5,8.GND
+
C
2
2–(R
0.65
)
P
D
= V
O
·I
O
100×100×2mm (11.5°C/W)
100
–1
ηχ
C
3
GND
GND
V
O :
Output voltage
V
IN :
Input voltage
I
O
75
100
125
:
Output
C
1
C
2
C
3
L
1
1000
µ
F/50V
1000
µ
F/25V
:
0.47
µ
F/10V(only when the soft start function is used)
:
100
µ
H
:
:
current
0
–25
0
25
50
ηχ
: Efficiency (%)
Ambient Temperature T
a
(°C)
ICs
79
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