S-817A14ANB-CUDT2G Seiko Instruments, S-817A14ANB-CUDT2G Datasheet - Page 18
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S-817A14ANB-CUDT2G
Manufacturer Part Number
S-817A14ANB-CUDT2G
Description
IC REG LDO 20MA 1.4V SC-82AB
Manufacturer
Seiko Instruments
Datasheet
1.S-817A33ANB-CUWT2G.pdf
(53 pages)
Specifications of S-817A14ANB-CUDT2G
Regulator Topology
Positive Fixed
Voltage - Output
1.4V
Voltage - Input
Up to 10V
Voltage - Dropout (typical)
0.92V @ 10mA
Number Of Regulators
1
Current - Output
20mA (Min)
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
SC-70-4, SC-82-4, SOT-323-4, SOT-343
Number Of Outputs
1
Polarity
Positive
Input Voltage Max
12 V
Output Voltage
1.4 V
Output Voltage Tolerance
+/- 2 %
Output Type
Fixed
Dropout Voltage (max)
1.58 V
Output Current
50 mA
Line Regulation
20 mV
Load Regulation
20 mV
Voltage Regulation Accuracy
2 %
Maximum Power Dissipation
400 mW
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Limit (min)
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
18
SUPER-SMALL PACKAGE CMOS VOLTAGE REGULATOR
S-817 Series
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
= (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
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 k Ω , V
2
O
2.2
= 2 V
OUT(E)
: Effective output voltage):
2.4
Rev.5.0
_00