SECOS S5U2178

S5U2178
CMOS Low Dropout
Voltage Regulator
Elektronische Bauelemente
RoHS Compliant Product
Description
The S5U2178 series positive,linear regulators feature low quiescent
current (45µA typ.) with low dropout voltage, making them ideal
for battery applications. Output voltage are set at the factory and
trimmed to 1.5% accuracy.These rugged devices have both
Thermal Shutdown and Current Fold-back to prevent device failure
under the "Worst" of operating conditions. In applications requiring a
low noise, regulated supply, place a 1000pF capacitor between
Bypass and Ground.The S5U2178 is stable with an output capacitance
of 4.7µF or greater.
Features
REF.
* Low Temperature Coefficient
* Over-Temperature Shutdown
* Highly Accurate ± 1.5%
* Very Low Dropout Voltage
A
b
L4
c
L1
E
Millimeter
Min.
Max.
4.40
4.80
0.66
0.91
0.00
0.30 B
0.36
0.5
2.29
2.79
9.80
10.4
REF.
c2
L2
D
e
L
Millimeter
Min.
Max.
1.25
1.45
1.27 REF.
8.6
9.0
1.70 REF.
14.6
15.8
0˚
8˚
* Noise Reduction Bypass Capacitor
* Short Circuit Current Fold-back
* Guaranteed 1.5 A output
* Current Limiting
* Power-Saving Shutdown Mode
Applications
* PC Peripherals
* Wireless Devices
* Portable Electronics
* Battery Powered Widgets
* Instrumentation
Functional Block Diagram
Typical Application Circuit
S5U2178
http://www.SeCoSGmbH.com/
01-Jun-2002 Rev. A
Any changing of specification will not be informed individual
Page 1 of 6
S5U2178
CMOS Low Dropout
Elektronische Bauelemente
Voltage Regulator
Absolute Maximum Ratings
Parameter
Symbol
Ratings
Unit
VIN
8
V
Output Current
IOUT
PD/( VIN- VO)
A
Output Voltage
VOUT
1.5~5.0
V
Operating Ambient Temperature
Topr
-40 ~ +85
Tj
-40 ~ +125
Tj Max
150
jc
5
PD
3000
Input Max Voltage
Junction Temperature
Maximum Junction Temperature
Thermal Resistance
Internal Power Dissipation(
T=100 )
EDS Classification
Output Voltage
Symbol
VOUT (E)
Output Current
Current Limit
Load Regulation
IO
ILIM
REGLOAD
Dropout Voltage
(Note1)
VDROPOUT
unless otherwise
Condition
Min
Line Regulation
Input Voltage
Over Temperature Shutdown
Over Temperature Hysterisis
Output Voltage
Temperature Coefficient
Short Circuit Current
-
-
A
1.5
2.0
-
A
IO=1mA to 1.5A
-1
0.2
1
%
2.0V
-
-
1300
2.8V
-
-
800
-
-
600
-
45
70
A
A
1.5V<VOUT(T)
IO=1.5A
VO=VOUT(E)-2% 2.0V<VOUT(T)
-
45
-
-0.15
-
0.15
-0.1
0.02
0.1
-0.4
-
0.4
mV
%
Note3
-
7
-
150
-
-
30
-
TC
-
30
-
ppm/
-
750
-
mA
ISC
Output Voltage Noise
eN
Output Voltage Noise
eN
http://www.SeCoSGmbH.com/
(Note2)
VIN
OTS
OTH
PSRR
01-Jun-2002 Rev. A
V
1.5
IO=1mA~1.5A
IO=1mA
VOUT(T)<2.0V
VIN=VOUT(T)+1 to
2.0V VOUT(T)<4.0V
VOUT(T)+1
(T)+2 to
(T)+1 to
4.0V VOUT(T)
Power Supply Rejection
Shutdown Supply Current
1.5%
VOUT>1.2V
IGND
PSRR
EN Input Bias Current
Unit
VOUT>1.2V
IO=0mA
Power Supply Rejection
EN Input Threshold
Max
-1.5%
IQ
REGLINE
TYP
VOUT(T)
VEN=VEHmin, IO=1mA
2.8V<VOUT(T)
Quiescent Current
Ground Pin Current
mW
B
Electrical Characteristics VIN=VOUT(T)+2V, VEN=VIN, TA=25
Parameter
/W
VEH
VEL
IEH
IEL
ISD
VOUT<0.4V
Io=100mA
Co=4.7 F ceramic
Io=100mA
Co=4.7 F ceramic
CBYP=0.01 F
f=10Hz~100kHz
Io=10mA,
CBYP=0 F
f=10Hz~100kHz
Io=10mA,
CBYP=0.01 F
V
f=1kHz
-
50
-
f=10kHz
-
20
-
f=1kHz
-
75
-
f=10kHz
-
55
-
Co=4.7 F
-
30
-
Vrms
Co=4.7 F
-
30
-
Vrms
2.0
-
VIN
V
0
-
0.4
V
dB
dB
VIN=7V
-
-
0.1
A
VEN= 0V, VIN=7V
-
-
0.5
A
VIN=5V, VOUT=0V, VEN=0V
-
0.5
2
A
Any changing of specification will not be informed individual
Page 2 of 6
S5U2178
CMOS Low Dropout
Elektronische Bauelemente
Voltage Regulator
Note 1: VOUT (E) =Effective Output Voltage (i.e. the output voltage when “VOUT (T) + 2.0V” is provided at the VIN pin while maintaining a
certain IOUT value).
2: VOUT (T) =Specified Output Voltage
3: VIN (MIN) =V OUT+VDROPOUT
Ordering Information(contd.)
Part Number
S5U2178-15
S5U2178-25
S5U2178-47
Marking
8G152
XXXX
8G252
XXXX
8G472
XXXX
Output Voltage
Part Number
1.5V
S5U2178-18
2.5V
S5U2178-33
4.7V
S5U2178-50
Marking
Output Voltage
8G182
XXXX
8G332
XXXX
8G502
XXXX
1.8V
3.3V
5.0V
Detailed Description
The S5U 2178 of COMS regulators contain a PMOS pass transistor,voltage reference, error amplifier,over-current protection and thermal
shutdown.The P-channel pass transistor receives data from the error amplifier, over-current shutdown, and thermal protection circuits.
During normal operation, the error amplifier compares the output voltage to a precision reference. Over-current and Thermal shutdown circuits
o
become active when the junction temperature exceeds140 C, or the current exceeds 2.2A. During thermal shutdown, the output voltage
remains low. Normal operation is restored when the junction temperature drops below 120oC.The S5U 2178 behaves like a current
source when the load reaches 2.2A. However, if the load impedance drops below 0.3 Ω , the current drops back to 600mA to prevent
excessive power dissipation. Normal operation is restored when the load resistance exceeds of 0.75 Ω .
External Capacitors
The S5U 2178 is stable with an output capacitance to ground of 4.7uF or greater. Ceramic capacitors have the lowest ESR, and will
offer the best AC performance. Conversely, Aluminum Electrolytic capacitors exhibit the highest ESR, resulting in the poorest AC
response. Unfortunately, large value ceramic capacitors are comparatively expensive. One option is to parallel a 0.1uF ceramic
capacitor with a 10uF Aluminum Electrolytic. The benefit is low ESR, high capacitance, and low overall cost. A second capacitor is
recommended between the input and ground to stabilize VIN. The input capacitor should be at least 0.1uF to have a beneficial
effect. A third capacitor can be connected between the BY-PASS pin and GND. This capacitor can be a low cost Polyester
Film variety between the value of 0.001~0.01uF. A large capacitor improves the AC ripple rejection, but also makes the output
come up slowly. This "Soft" turn-on is desirable in some applications to limit turn-on surges. All capacitors should be placed
in closed proximity to the pins. A "Quiet" ground termination is desirable. This can be achieved with a "Star" connection.
Enable
When EN pin is pulled low, the PMOS pass transistor shuts off, and all internal circuits are powered down. In this state, the quiescent
current is less than 1uA. This pin behaves much like an electronic switch. 100KΩ resistor is necessary between VEN source and EN
pin when VEN is high than VIN. (Note: There is no internal pull-up for EN pin. It can not be floating.)
ht tp://www.SeCoSGmbH.com/
01-Jun-2002 Rev. A
Any changing of specification will not be informed individual
Page 3 of 6
S5U2178
Elektronische Bauelemente
CMOS Low Dropout
Voltage Regulator
Characteristics Curve
http://www.SeCoSGmbH.com/
01-Jun-2002 Rev. A
Any changing of specification will not be informed individual
Page 4 of 6
S5U2178
Elektronische Bauelemente
http://www.SeCoSGmbH.com/
01-Jun-2002 Rev. A
CMOS Low Dropout
Voltage Regulator
Any changing of specification will not be informed individual
Page 5 of 6
S5U2178
Elektronische Bauelemente
ht tp://www.SeCoSGmbH.com/
01-Jun-2002 Rev. A
CMOS Low Dropout
Voltage Regulator
Any changing of specification will not be informed individual
Page 6 of 6