CYT8117
1A Positive Voltage Regulator
Features
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Pin Configuration
1. ADJ/GND
2. OUT
3. VIN
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1.1V dropout at full load current（Typ）
Low Dropout Performance.
Guaranteed 1A Output Current.
Wide Input Supply Voltage Range.
Over-temperature and Over-current
Protection.
Fixed or Adjustable Output Voltage.
Rugged 3KV ESD withstand capability.
SOT-223
Typical Application
Adjustable Voltage Regulator
Fixed Voltage Regulator
ShenZhen CYT IC Design CO ,Ltd
-1-
CYT8117
1A Positive Voltage Regulator
Application
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Active SCSI Terminators.
High Efficiency Linear Regulators.
5V to 3.3V Linear Regulators
Motherboard Clock Supplies.
Ordering Information
Absolute Maximum Rating
ShenZhen CYT IC Design CO ,Ltd
-2-
CYT8117
1A Positive Voltage Regulator
Electrical Characteristic
V
IN,MAX
≤
8V, V
IN,MIN
– V
OUT
= 1.5V, I
OUT
= 10mA, C
IN
= 10µF, C
OUT
= 22µF, T
J
= 0 – 125°C, unless otherwise specified.
Notes:
1. Low duty cycle pulse testing with which TJ remains unchanged.
2.
∆VOUT, ∆VREF
= 1%.
ShenZhen CYT IC Design CO ,Ltd
-3-
CYT8117
1A Positive Voltage Regulator
Application Hints
Like any linear voltage regulator, CYT8117
requires external capacitors to ensure stability.
The external capacitors must be carefully
selected to ensure performance.
Thermal Considerations
It is important that the thermal limit of the
package
is not exceeded. The CYT8117 has built-in
thermal protection. When the thermal limit is
exceeded, the IC will enter protection, and
VOUT
will be pulled to ground. The power dissipation
for a given application can be calculated as
following:
The power dissipation (PD) is
PD = IOUT * [VIN – VOUT]
The thermal limit of the package is then limited
to
PD(MAX) = [TJ – TA]/ΘJA where TJ is the
junction
temperature, TA is the ambient temperature,
and
ΘJA
is around 60°C/W for CYT8117.CYT8117 is
designed to enter thermal protection at 175°C.
For example, if TA is 25°C then the maximum
PD
is limited to about 2.5W. In other words, if
IOUT(MAX) = 1A, then [VIN – VOUT] cannot
exceed
2.5V.
Input Capacitor
An input capacitor of at least 10µF is required.
Ceramic or Tantalum can be used. The value
can be increase without upper limit.
Output Capacitor
An output capacitor is required for stability. It
must be placed no more than 1 cm away from
the VOUT pin, and connected directly between
VOUT and GND pins. The minimum value is
22µF but may be increase without limit.
ShenZhen CYT IC Design CO ,Ltd
-4-
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