s-817b23ay-z-g Seiko Instruments Inc., s-817b23ay-z-g Datasheet - Page 17
s-817b23ay-z-g
Manufacturer Part Number
s-817b23ay-z-g
Description
Super-small Package Cmos Voltage Regulator
Manufacturer
Seiko Instruments Inc.
Datasheet
1.S-817B23AY-Z-G.pdf
(52 pages)
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Rev.4.2
The S-817 Series can be configured as a constant current circuit. Refer to Figure 16 and 17.
Constant amperage (I
I
Note that by using a circuit in Figure16, it is impossible to set the better driving ability to the constant
amperage (IO) than the S-817 Series basically has.
To gain the driving ability which exceeds the S-817 Series, there’s a way to combine a constant current
circuit and a current boosting circuit, as seen in Figure 17.
The maximum input voltage for a constant current circuit is 10 V + the voltage for device (VO).
It is not recommended to add a capacitor between the VIN (power supply) and VSS pin or the VOUT
(output) and VSS pin because the rush current flows at power-on.
The following is a characteristics example of input voltage between VIN and VO vs. IO current (Typ. Ta
= 25°C) in constant current boosting circuit in Figure 17.
O
V
_00
= (V
IN,
V
O
S-817A11ANB, S-817B11AMC, Tr : 2SK1213Y, R
OUT(E)
pins, Input voltage - I
÷ R
L
) +I
SS
.
O
) is calculated using the following equation (V
SUPER-SMALL PACKAGE CMOS VOLTAGE REGULATOR
O
0.60
0.50
0.40
0.30
0.20
0.10
0.00
current
1.4
11 Ω
Seiko Instruments Inc.
5.5 Ω
3.67 Ω
1.6
2.75 Ω
R
L
2.2 Ω
=1.83 Ω
1.8
V
IN
−V
O
1 :
(V)
1 kΩ, V
2
O
2.2
=2 V
OUT(E)
: Effective output voltage):
2.4
S-817 Series
17
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