S-817A43ANB-CVGT2G Seiko Instruments, S-817A43ANB-CVGT2G Datasheet - Page 18

• Manufacturer Part Number: S-817A43ANB-CVGT2G
• Description: IC REG LDO 65MA 4.3V SC-82AB
• Manufacturer: Seiko Instruments

Specifications of S-817A43ANB-CVGT2G

• Regulator Topology: Positive Fixed
• Voltage - Output: 4.3V
• Voltage - Input: Up to 10V
• Voltage - Dropout (typical): 0.19V @ 10mA
• Number Of Regulators: 1
• Current - Output: 65mA (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: 4.3 V
• Output Voltage Tolerance: +/- 2 %
• Output Type: Fixed
• Dropout Voltage (max): 1.58 V
• Output Current: 50 mA
• Line Regulation: 20 mV
• Load Regulation: 65 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