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