S-817A18ANB-CUHT2G Seiko Instruments, S-817A18ANB-CUHT2G Datasheet - Page 16

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S-817A18ANB-CUHT2G

Manufacturer Part Number
S-817A18ANB-CUHT2G
Description
IC REG LDO 20MA 1.8V SC-82AB
Manufacturer
Seiko Instruments
Datasheet

Specifications of S-817A18ANB-CUHT2G

Regulator Topology
Positive Fixed
Voltage - Output
1.8V
Voltage - Input
Up to 10V
Voltage - Dropout (typical)
0.58V @ 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
1.8 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

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16
SUPER-SMALL PACKAGE CMOS VOLTAGE REGULATOR
S-817 Series
To stabilize operation against variation in output load, a capacitor (C
and VSS in the S-817 series because the phase is compensated with the help of the internal phase
compensation circuit and the ESR of the output capacitor.
When selecting a ceramic or an OS capacitor, capacitance should be 0.1 μ F or more, and when selecting a
tantalum or an aluminum electrolytic capacitor, capacitance should be 0.1 μ F or more and ESR 30 Ω or
less.
When an aluminum electrolytic capacitor is used attention should be especially paid to since the ESR of the
aluminum electrolytic capacitor increases at low temperature and possibility of oscillation becomes large.
Sufficient evaluation including temperature characteristics is indispensable.
characteristics differ depending upon the type of the output capacitor.
Reference Data 1. Transient Response Characteristics”.
Selection of Output Capacitor (C
Application Circuits
1. Output Current Boosting Circuit
As shown in Figure 15, the output current can be boosted by externally attaching a PNP transistor. The
base current of the PNP transistor is controlled so that output voltage (V
in the S-817 Series when base-emitter voltage (V
between input voltage (V
The following are tips and hints for selecting and ensuring optimum use of external parts
• PNP transistor (Tr1):
• Resistor (R
• Output capacitor (C
• Resistor (R
• DO NOT attach a capacitor between the S-817 Series power source (V
• To improve transient response characteristics of the output current boosting circuit shown in
• Pay attention to the short current limit circuit incorporated into the S-817 Series because it does
between base and emitter of the PNP transistor to avoid oscillation.
Figure 15, check that no problem occurs due to output fluctuation at powering on or due to
power or load fluctuation under normal operating conditions.
not function as a shortcircuiting protection circuit for this boosting circuit.
1. Set h
2. Confirm that no problem occurs due to power dissipation under normal operation conditions.
Generally set R
Output capacitor (C
or load fluctuation, but oscillation might occur. Always connect resistor R2 in series to output
capacitor C
FE
1
2
):
): Set R
to approx. 100 to 400.
L
.
1
IN
to 1 k Ω ÷ V
L
2
GND
):
V
) and S-817 Series power source pin (VIN).
to 2 Ω × V
L
IN
) is effective in minimizing output fluctuation at powering on or due to power
C
IN
R
OUT (S)
Seiko Instruments Inc.
OUT(S)
L
1
)
Tr1
(the voltage specified in the S-817 Series) or more.
or more.
VIN
Figure 15
BE
VSS
S-817
series
) necessary to turn on the PNP transistor is obtained
VOUT
L
) must be mounted between VOUT
R
C
2
Refer to C
L
OUT
V
Overshoot and undershoot
) goes the voltage specified
OUT
IN
) and GND pins or
L
dependencies in “
Rev.5.0
_00

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