S-817A20APF-CUJTFG Seiko Instruments, S-817A20APF-CUJTFG Datasheet - Page 15
![IC REG LDO 35MA 2V SNT-4A](/photos/38/66/386697/snt-4a_sml.jpg)
S-817A20APF-CUJTFG
Manufacturer Part Number
S-817A20APF-CUJTFG
Description
IC REG LDO 35MA 2V SNT-4A
Manufacturer
Seiko Instruments
Datasheet
1.S-817A33ANB-CUWT2G.pdf
(53 pages)
Specifications of S-817A20APF-CUJTFG
Regulator Topology
Positive Fixed
Voltage - Output
2V
Voltage - Input
Up to 10V
Voltage - Dropout (typical)
0.4V @ 10mA
Number Of Regulators
1
Current - Output
35mA (Min)
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
SNT-4A
Number Of Outputs
1
Polarity
Positive
Input Voltage Max
10 V
Output Voltage
2 V
Output Type
Fixed
Dropout Voltage (max)
0.67 V
Output Current
0.035 A
Line Regulation
20 mV
Load Regulation
30 mV
Voltage Regulation Accuracy
2 %
Maximum Power Dissipation
300 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
Rev.5.0
Operation
1. Basic Operation
2. Output Transistor
3. Short Circuit Protection
The S-817A series incorporates a short circuit protection to protect the output transistor against short
circuit between VOUT pin and VSS pin. Installation of the short-circuit protection which protects the
output transistor against short-circuit between VOUT and VSS can be selected in the S-817A series. The
short-circuit protection controls output current as shown in the “Typical Characteristics 1.”. Output
Voltage versus Output Current, and suppresses output current at about 40 mA even if VOUT and VSS
pins are short-circuited.
The short-circuit protection can not be a thermal protection at the same time. Attention should be paid to
the Input voltage and the load current under the actual condition so as not to exceed the power
dissipation of the package including the case for short-circuit.
When the output current is large and the difference between input and output voltage is large even if not
shorted, the short-circuit protection may work and the output current is suppressed to the specified value.
For details, refer to “
Voltage”.
In addition, S-817B series is removing a short-circuit protection, and is the product which enabled it to
pass large current.
Figure 14 shows the block diagram of the S-817 Series.
The error amplifier compares the reference voltage (V
divided by feedback resistors R
to ensure a certain output voltage free of any fluctuations of input voltage and temperature.
The S-817 series uses a P-channel MOS FET as the output transistor.
Be sure that V
inverse current flowing from VOUT pin through a parastic diode to VIN pin.
_00
*1. Parasitic diode
OUT
VSS
VIN
Current
supply
does not exceed V
Reference voltage
V
ref
circuit
Characteristics (Typical Data) 3. Maximum Output Current vs. Input
SUPER-SMALL PACKAGE CMOS VOLTAGE REGULATOR
s
and R
IN
Seiko Instruments Inc.
−
+
amplifier
+ 0.3 V to prevent the voltage regulator from being damaged due to
f
. It supplies the output transistor with the gate voltage necessary
Error
Figure 14
ref
) with V
R
R
s
f
fb
, which is the output voltage resistance-
V
*1
fb
VOUT
S-817 Series
15