CYT8117
1A positive Voltage Regulator
Description
The CYT8117-ADJ and CYT8117-1.2,-1.8, -2.5,
-2.85, -3.3 and -5 are low dropout three-terminal
regulators with 1A output current capability.
These devices have been optimized for low
voltage where transient response and minimum
input voltage are critical. The 2.85V version is
designed specifically to be used in Active
Terminators for SCSI bus.
On-chip thermal limiting provides protection
against any combination of overload and ambient
temperatures that would create excessive
junction temperatures.
Unlike PNP type regulators where up to 10% of
the output current is wasted as quiescent current,
the quiescent current of the CYT8117 flows into
the load, increasing efficiency.
The CYT8117 series regulators are available in
the industry-standard SOT-223, power packages.
Features
Low dropout voltage
Load regulation: 0.05% typical
Optimized for Low Voltage
On-chip thermal limiting-Standard SOT223
packages
Three-terminal adjustable or fixed low
dropout1.2V,1.5V,1.8V, 2.5V, 2.85V, 3.3V,
5V. regulators
ROHS Compliant and 100% Lead(Pb)-Free
Application
Active SCSI terminators
High efficiency linear regulators
Post regulators for switching supplies
Battery chargers
12V to 5V linear regulators
Motherboard clock supply
Pin Configuration
Figure 1.
Pin Assignments of CYT8117
Ordering Information
Device
CYT8117TXXLF
CYT8117TALF
Marking
CYT8117TXXLF
CYT8117TALF
SOT-223
(Lead-free)
Package
Vout
Fixed output voltages; XX denotes voltage
options (1.2V,1.5V,1.8V, 2.5V,2.85V and 3.3V)
Adjustable output voltage.
2008-09-03
ShenZhen CYT IC Design CO . ,Ltd
1
CYT8117
Electrical Characteristic
Typicals and limits appearing in normal type apply for TJ=25℃.Limits appearing in Boldface type apply
over the entire junction temperature for operation,0℃to 125℃.
Parameter
Reference Voltage
Conditions
1.5V
≤(VIN-
VOUT)
≤
7V,
10mA
≤
IOUT≤1A
10mA
≤IOUT≤1A
CYT8117-1.2 ,2.7V≤ VIN≤8.2V
CYT8117-1.8, 3.3V
≤VIN≤8.8V
CYT8117-2.5, 4V≤VIN≤9.5V
CYT8117-2.85,4.35V≤VIN≤9.85V
CYT8117-3.3, 4.8V
≤VIN≤10.3V
CYT8117-5, 6.5V
≤VIN≤12V
(VOUT+ 1.5V)
≤VIN≤12V,
IOUT = 10mA
(VIN-VOUT) = 2V,
10mA
≤
IOUT≤1A
△VREF
= 1%, Iout= 1A
(VIN-VOUT) = 2V
1.5V
≤
(Vin-Vout )
≤7V,
10mA
≤
IOUT≤1A
10mA
≤
IOUT≤1A
1.5V
≤(VIN-VOUT) ≤10V
VIN= VOUT+ 1.25V
f=120Hz, Tantalum,
(VIN-VOUT) = 3V, IOUT= 1A,
TA= 25°C, 30ms pulse
Min
(Note 2)
1.225
(-2%)
1.152
1.764
2.450
2.793
3.234
4.900
Typ
(Note2)
1.250
Max
(Note 2)
1.275
(+2%)
1.248
1.836
2.550
2.907
3.366
5.100
0.2
0.5
1.250
120
5
Units
V
Output Voltage
1.200
1.800
2.500
2.850
3.300
5.000
0.035
0.2
1.100
V
V
V
V
V
V
%
%
V
A
uA
uA
mA
Line Regulation
(Note 3)
Load
Regulation(Note 3)
Dropout Voltage
Current Limit
Adjust Pin Current
Adjust Pin Current
Change
Minimum Load
Current(Note 4)
Quiescent Current
Ripple Rejection
Thermal Regulation
Temperature
Stability
Long-Term Stability
RMS Output Noise
(% of VOUT)
Thermal Resistance,
Junction to Case
Thermal Shutdown
Thermal Shutdown
Hysteresis
1.1
1.5
50
0.2
10
5
60
72
0.01
0.5
0.1
13
mA
dB
%/W
%
%
%
°C/W
°C
°C
TA= 125°C, 1000hrs.
TA= 25°C, 10Hz≤f
≤10kHz
SOT-223
Junction Temperature
0.3
0.003
15
155
25
Note 1: Typical Values represent the most likely parametric norm.
Note 2: All limits are guaranteed by testing or statistical analysis.
2008-09-03
ShenZhen CYT IC Design CO . ,Ltd
3
CYT8117
Note 3: Load and line regulation are measured at constant junction room temperature.
Note 4: The minimum output current required to maintain regulation
Typical Application
Figure4.
Typical Applications of CYT8117
Notice:
The distance between Vout pin and Capacitor should not exceed 4cm for excellent performance
Typical Performance Characteristics
(continued)
Output Current ( A )
Figure 5.
Dropout Voltage VS. Output Current
Junction Temperature (℃)
Figure 6.
Load Regulatioin VS. Temperature
2008-09-03
ShenZhen CYT IC Design CO . ,Ltd
4
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