CYT 8117
1A Positive Voltage Regulator
General Description
The CYT8117 series of high performance low
dropout voltage regulators are designed gor
applications that require efficient conversion
and fast transient response.
Features
■
■
■
■
■
■
■
■
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.
Available in SOT-223 Packages.
Applications
■
■
■
■
Active SCSI Terminators.
High Efficiency Linear Regulators.
5V to 3.3V Linear Regulators
Motherboard Clock Supplies.
SOT-223
Package
ShenZhen CYT IC Design CO ,Ltd
1
CYT 8117
Ordering Information
CYT8117T-
X
X
-LF
Lead-free
Output Voltage:15 : Vout=1.5V
18 : Vout=1.8V
25 : Vout=2.5V
30 : Vout=3.0V
33 : Vout=3.3V
A : Vout=ADJ
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.
Symbol
Parameter
Conditions
(V
IN
-V
OUT
)=1.5V , I
OUT
=
10mA, TA=25℃
CYT8117T15
CYT8117T18
CYT8117T25
CYT8117T30
CYT8117T33
(V
IN
-V
OUT
)=1.5V ,
10mA,
I
OUT
=
Min
Typ
Max
Units
V
OUT
Output Voltage
(1)
-2％
1.5
1.8
2.5
2.8
3.0
1.25
0.3
0.4
48
0.2
1.1
10
4
1.8
0.07
175
0.003
35
+2％
V
V
REF
VSR
V
LR
I
ADJ
Reference Voltage
(1)
(Adi. Volage Version)
Line Regulation
(1)
Load Regulation
(1)
Adjust Pin Current
Adjust Pin Current
Change
Dropout Voltage
(2)
Quiescent Current
Minimum Load Current
Current Limit
Temperature Voefficient
Thermal Protection
RMS Output Noise
Ripple Rejection Ratio
-2％
--
--
--
-2％
--
--
--
--
--
--
--
--
--
--
--
--
V
V
OUT
+1.5V <V
IN
< 8V I
OUT
=
10mA,
(V
IN
-V
OUT
)=1.5V ,
10mA≤I
OUT
≤1A,
V
OUT
+1.5V <V
IN
< 8V
10mA≤I
OUT
≤1A,
％
％
uA
uA
V
mA
mA
A
％/℃
℃
％Vo
dB
∆
I
ADJ
V
D
I
Q
I
O
I
CL
T
C
OTP
V
N
R
A
--
--
--
--
--
--
--
∆V
REF
=1
％,
I
OUT
=1A
Fixed Output Version
T
A
=25℃, 10Hz
≤
f
≤
10KHz
F=120Hz, Cout=22uF
(Tantalum),(V
IN
-V
OUT
)=3V,
I
OUT
=1A
--
--
Notes:1.
Low duty cycle pulse testing with which TJ remains unchanged.
2.
∆VOUT, ∆VREF
= 1%.
ShenZhen CYT IC Design CO ,Ltd
3
CYT 8117
Absolute Maximum Rating
Parameter
Input Supply Voltage
Thermal Resistance,
Junction-to-Ambient SOT-223
Lead Temperature (Soldering,10 sec.)
Operating Junction Temperature Range
Storage Temperature Range
Symbol
V
IN
Ө
JA
T
LEAD
T
J
T
STG
Value
9
60
260
0 to +125
-40 to +150
Units
V
℃/W
℃
℃
℃
Application Hints
Like any linear voltage regulator, CYT8117 requires external capacitors to ensure stability. The
external capacitors must be carefully selected to ensure performance.
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.
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.
ShenZhen CYT IC Design CO ,Ltd
4
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