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SSC2128
CMOS Low Dropout
Elektronische Bauelemente
RoHS Compliant Product
Voltage Regulator
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Description
The SSC2128 series positive,linear regulators feature low quiescent current (45A 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 SSC2128 is stable with an output capacitance of 4.7F or greater.
Features
* Low Temperature Coefficient * Over-Temperature Shutdown
REF. A B C D E F Min.
Millimeter
Max.
6.20 5.00 4.00 8 C 0.90 0.25
REF. M H L J K G
Min.
Millimeter
Max.
* Highly Accurate 1.5% * Very Low Dropout Voltage * Noise Reduction Bypass Capacitor * Short Circuit Current Fold-back * Guaranteed 1.5A Output * Current Limiting * Power-Saving Shutdown Mode
5.80 4.80 3.80 0C 0.40 0.19
0.10 0.25 0.35 0.49 1.35 1.75 0.375 REF. 45 C 1.27 TYP.
Applications
* PC Peripherals * Wireless Devices
* Portable Electronics * Battery Powered Widgets * Instrumentation
Functional Block Diagram
Typical Application Circuit
SSC2128
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Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page 1 of 6
SSC2128
Elektronische Bauelemente
CMOS Low Dropout Voltage Regulator
www..com
Absolute Maximum Ratings
Parameter
Input Voltage Output Current Output Voltage Operating Ambient Temperature Junction Temperature Max. Junction Temperature Thermal Resistance Power Dissipation ( EDS Classification
o
Symbol
VIN IOUT VOUT Topr Tj Tj Max. jc PD
Ratings
8
PD/(VIN-VO) 1.5~5.0 -40~+85 -40~+125 150
Unit
V A V
o o
C C
C
o o
T=100 C)
o
40
810 B
C /W
mW
Electrical Characteristics Ta=25 C unless otherwise noted (VIN=VOUT(T)+2V,VEN=VIN )
Parameter
Output Voltage Output Current Current Limit Load Regulation Dropout Voltage Quiescent Current Ground Pin Cruuent Line Regulation
Symbol
VOUT (E) IO ILIM
REGLOAD
1
Min.
-1.5% 1.5 1.5 -1
_ _ _ _ _
Typ.
VOUT (T)
_
2
Max.
1.5%
_ _
Unit
V
A A
Condition
VEN=VEHmin,IO=1mA
2 0.2
_ _ _
VOUT>1.2V VOUT>1.2V
1 1300 800 600 70
_
%
mV uA uA % V
o o
IO=1mA~1.5A 1.5V< VOUT(T)2.0V 2.0V< VOUT(T) 2.8V 2.8V< VOUT(T) Io=750mA Vo=VOUT(E)-2%
VDROPOUT IQ
IGND
45 45
_
Io=0mA
-0.15 REGLINE VIN OTS OTH TC ISC PSRR -0.1 -0.4 Input Voltage Over Temperature Shutdown Over Temperature Hystersis Output Voltage Temperature Coefficient Short Circuit Current Power Supply Rejection
Note
_ _ _ _ _ _ _ _
3
0.15 0.1 0.4 7
_
_ _ _ _ _ _ _ _
0.02
_
_
IO=1mA~1.5A Io=1mA VOUT(T)< 2.0V VIN=VOUT(T)+ 1 2.0V VOUT(T)<4.0V to VOUT(T)+2 4.0V VOUT(T)
150 30 30 750 50 20 75 55 30
_ _ _ _
C C
o
ppm/ C mA dB VOUT<0.4V Io=100mA f=1kHz Co=4.7uF f=10kHz ( c e r a m ic ) Io=100mA f=1kHz Co=4.7uF( ce ra mi c) f=10kHz CBYP=0.01uF f=10Hz~100kHz CBYP=0uF Io=10mA CBYP=0.01uF CO=4.7uF
Output Voltage Noise EN Input Threshold EN Input Bias Current Shutdown Supply Current
eN VEH VEL IEH IEL ISD
_
uVrms V uA uA
2
_ _ _
VIN
0
0.4 0.1 0.5 2
VIN=7V VEN=0V,VIN= 7V VIN=5V,VOUT=0V,VEN=0V
0.5
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) =VOUT+VDROPOUT
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01-Jun-2002 Rev. A
Page 2 of 6
SSC2128
Elektronische Bauelemente
CMOS Low Dropout Voltage Regulator
www..com
Ordering Information(contd.)
Part Number
SSC2128-15 SSC2128-25 SSC2128-47
Marking
8B152 XXXX 8B252 XXXX 8B472 XXXX
Output Voltage
1.5V 2.5V 4.7V
Part Number
SSC2128-18 SSC2128-33 SSC2128-50
Marking
8B182 XXXX 8B332 XXXX 8B502 XXXX
Output Voltage
1.8V 3.3V 5.0V
Characteristics Curve
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Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page 3 of 6
SSC2128
Elektronische Bauelemente
CMOS Low Dropout Voltage Regulator
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115 : 85 : 55 :
25 : -5 : -45 :
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Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page 4 of 6
SSC2128
Elektronische Bauelemente
CMOS Low Dropout Voltage Regulator
www..com
http://www.SeCoSGmbH.com/
Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page 5 of 6
SSC2128
Elektronische Bauelemente
CMOS Low Dropout Voltage Regulator
www..com
Detailed Description
The SSC2128 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 SSC2128 behaves like a current source when the load reaches 2.2A. However, if the load impedance drops below 0.3 [ , the current drops back to 600mA to prevent excessive power dissipation. Normal operation is restored when the load resistance exceeds of 0.75 [ .
External Capacitors
The SSC2128 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 capcacitor 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
is high than VIN. (Note: There is no internal pull-up for EN pin.)
When 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. 100K[ resistor is necessary between V EN source and EN pin when VEN
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01-Jun-2002 Rev. A
Page 6 of 6

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