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| SSC2138 1.5A CMOS Elektronische Bauelemente RoHS Compliant Product Low Dropout Voltage Regulator Description The SSC2138 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.The SSC2138 is stable with an output capacitance of 4.7F or greater. Features * Low Temperature Coefficient * Over-Temperature Shutdown * Adjustable Version * Very Low Dropout Voltage * High Accurate 1.5% * Short Circuit Current Fold-back * Guaranteed 1.5A output * Current Limiting * Power-Saving Shutdown Mode 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. 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 SSC2138 http://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual 01-Jun-2002 Rev. A Page 1 of 7 SSC2138 Elektronische Bauelemente 1.5A CMOS Low Dropout Voltage Regulator Absolute Maximum Ratings Parameter Input Voltage Output Current Output Voltage Operating Ambient Temperature Junction Temperature Max. Junction Temperature Power Dissipation ( EDS Classification o Symbol VIN IOUT VOUT Topr Tj Tj Max. PD Ratings 8 PD/(VIN-VO) Gnd-0.3 to VIN+0.3 -40~+85 -40~+125 150 810 Unit V mA o o V C C T=100 C) o C mW o B 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 Ground Pin Current 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=VENmin,IO=1mA VO>1.2V VO>1.2V 2.0 0.2 _ _ _ 1 1300 800 600 _ % mV uA % V o o IO=1mA~1.5A 1.5V 45 _ IO=1mA~1.5A Io=1mA VIN=VOUT(T)+ 1 2.0V VOUT(T)<4.0V to VOUT(T)+2 4.0V VOUT(T) -0.15 -0.1 -0.4 Input Voltage Over Temperature Shutdown Over Temperature Hystersis Output Voltage Temperature Coefficient Short Circuit Current Power Supply Rejection Output Voltage Noise EN Input Threshold EN Input Bias Current Shutdown Supply Current ADJ Input Bias Current Min. Load Current ADJ Reference Voltage Note _ _ _ _ _ _ _ 3 0.15 0.1 0.4 7 _ _ _ _ _ _ _ 0.02 _ _ 150 30 30 750 50 20 30 _ _ _ _ C C o ppm/ C mA dB uVrms V uA uA uA mA V VOUT<0.4V Io=100mA f=1kHz Co=4.7uF f=10kHz (ceramic) f=10Hz~100kHz, Io=10mA CO=4.7uF VIN=2.7V to 7V VIN= 7V VEN=0V,VIN= 7V VIN=5V,VOUT=0V,VEN=0V VIN=5V,VADJ=1.242V 2 _ _ _ _ VIN 0 0.4 0.1 0.5 2 _ _ 0.5 1 _ 1 1.223 1.242 1.261 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 http://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual 01-Jun-2002 Rev. A Page 2 of 7 SSC2138 1.5A CMOS Elektronische Bauelemente Low Dropout Voltage Regulator Ordering Information(contd.) Part Number SSC2138-AD Marking 8CAD2 XXXX Output Voltage Adjustable Part Number Marking Output Voltage Detailed Description The SSC2138 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 SSC2138 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 SSC2138 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. 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 2uA. This pin behaves much like an electronic switch. 100K[ resistor is necessary between VEN source and EN pin when VEN is higher than VIN. (Note: There is no internal pull-up for EN pin.) Adjustable Version The adjustable version uses external feedback resistors to generate an output voltage anywhere from 1.5V to 5.0V. Vadj is trimmed to 1.242V and Vout is given by the equation: VOUT=Vadj*(1+R1/R2) Feedback resistors R1 and R2 should be high enough to keep quiescent current low, but increasing R1+R2 will reduce stability. In general, R1 and R2 in the 10's of k [ will produce adequate stability, given reasonable layout precautions. To improve stability characteristics, keep parasitic on the ADJ pin to min., and lower R1 and R2 values. ht tp://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual 01-Jun-2002 Rev. A Page 3 of 7 SSC2138 1.5A CMOS Elektronische Bauelemente Low Dropout Voltage Regulator Characteristics Curve http://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual 01-Jun-2002 Rev. A Page 4 of 7 SSC2138 1.5A CMOS Elektronische Bauelemente Low Dropout Voltage Regulator http://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual 01-Jun-2002 Rev. A Page 5 of 7 SSC2138 1.5A CMOS Elektronische Bauelemente Low Dropout Voltage Regulator ht tp://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual 01-Jun-2002 Rev. A Page 6 of 7 SSC2138 1.5A CMOS Elektronische Bauelemente Low Dropout Voltage Regulator External Resistor Divider Table R1(k[ ) VOUT 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.80 1.85 1.90 1.95 2.00 2.05 2.10 2.15 2.20 2.25 2.30 2.35 2.40 2.45 2.50 2.55 2.60 2.65 2.70 2.75 2.80 2.85 2.90 2.95 3.00 3.05 3.10 3.15 1 21.41 11.50 7.86 5.97 4.81 4.03 3.47 3.04 2.71 2.44 2.23 2.04 1.89 1.75 1.64 1.54 1.45 1.37 1.30 1.23 1.17 1.12 1.07 1.03 0.99 0.95 0.91 0.88 0.85 0.82 0.80 0.77 0.75 0.73 0.71 0.69 0.67 0.65 2 5 10 20 50 R2(k [ )=(1.242*R1(k [ ))/(VOUT-1.242) 42.83 107.07 214.14 428.28 1070.7 23.00 15.72 11.94 9.63 8.06 6.94 6.09 5.42 4.89 4.45 4.09 3.78 3.51 3.28 3.07 2.90 2.74 2.59 2.46 2.35 2.24 2.15 2.06 1.97 1.90 1.83 1.76 1.70 1.65 1.59 1.54 1.50 1.45 1.41 1.37 1.34 1.30 57.50 115.00 230.00 575.00 39.30 29.86 24.07 20.16 17.35 15.22 13.56 12.22 11.13 10.21 9.44 8.77 8.19 7.69 7.24 6.84 6.48 6.16 5.87 5.60 5.36 5.14 4.94 4.75 4.57 4.41 4.26 4.12 3.99 3.86 3.75 3.64 3.53 3.43 3.34 3.25 78.61 157.22 393.04 59.71 119.42 298.56 48.14 40.32 34.69 30.44 27.12 24.45 22.26 20.43 18.88 17.54 16.39 15.37 14.48 13.68 12.96 12.32 11.74 11.21 10.73 10.28 9.87 9.50 9.15 8.82 8.52 8.24 7.97 7.72 7.49 7.27 7.06 6.87 6.68 6.51 96.28 240.70 80.65 201.62 68.39 173.46 60.88 152.21 54.24 135.59 48.90 122.24 44.52 111.29 40.86 102.14 37.75 35.08 32.77 30.74 28.95 27.36 25.93 24.65 23.48 22.42 21.45 20.56 19.75 18.99 18.29 17.64 17.04 16.47 15.94 15.45 14.98 14.54 14.13 13.74 13.37 13.02 94.38 87.71 81.93 76.86 72.38 68.39 64.82 61.61 58.70 56.05 53.63 51.41 49.36 47.48 45.73 44.11 42.59 41.18 39.86 38.62 37.45 36.36 35.32 34.35 33.42 32.55 R1(k[ ) VOUT 3.20 3.25 3.30 3.35 3.40 3.45 3.50 3.55 3.60 3.65 3.70 3.75 3.80 3.85 3.90 3.95 4.00 4.05 4.10 4.15 4.20 4.25 4.30 4.35 4.40 4.45 4.50 4.55 4.60 4.65 4.70 4.75 4.80 4.85 4.90 4.95 5.00 1 0.63 0.62 0.60 0.59 0.58 0.56 0.55 0.54 0.53 0.52 0.51 0.50 0.49 0.48 0.47 0.46 0.45 0.44 0.43 0.43 0.42 0.41 0.41 0.40 0.39 0.39 0.38 0.38 0.37 0.36 0.36 0.35 0.35 0.34 0.34 0.33 0.33 2 1.27 1.24 1.21 1.18 1.15 1.13 1.10 1.08 1.05 1.03 1.01 0.99 0.97 0.95 0.93 0.92 0.90 0.88 0.87 0.85 0.84 0.83 0.81 0.80 0.79 0.77 0.76 0.75 0.74 0.73 0.72 0.71 0.70 0.69 0.68 0.67 0.66 5 3.17 3.09 3.02 2.95 2.88 2.81 2.75 2.69 2.63 2.58 2.53 2.48 2.43 2.38 2.34 2.29 2.25 2.21 2.17 2.14 2.10 2.06 2.03 2.00 1.97 1.94 1.91 1.88 1.85 1.82 1.80 1.77 1.75 1.72 1.70 1.67 1.65 10 6.34 6.19 6.03 5.89 5.76 5.63 5.50 5.38 5.27 5.16 5.05 4.95 4.86 4.76 4.67 4.59 4.50 4.42 4.35 4.27 4.20 4.13 4.06 4.00 3.93 3.87 3.81 3.75 3.70 3.64 3.59 3.54 3.49 3.44 3.40 3.35 3.30 20 12.69 12.37 12.07 11.78 11.51 11.25 11.00 10.76 10.53 10.32 10.11 9.90 9.71 9.52 9.35 9.17 9.01 8.85 8.69 8.54 8.40 8.26 8.12 7.99 7.87 7.74 7.62 7.51 7.40 7.29 7.18 7.08 6.98 6.88 6.79 6.70 6.61 50 31.72 30.93 30.17 29.46 28.78 28.13 27.50 26.91 26.34 25.79 25.26 24.76 24.28 23.81 23.36 22.93 22.52 22.12 21.73 21.35 20.99 20.64 20.31 19.98 19.66 19.36 19.06 18.77 18.49 18.22 17.96 17.70 17.45 17.21 16.98 16.75 16.52 R2(k[ )=(1.242*R1(k [ ))/(VOUT-1.242) Note: Small load (greater than 2mA) is necessary as R1 or R2 is larger than 50k [. Otherwise, output voltage probably can not be pulled down to 0V on disable mode. ht tp://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual 01-Jun-2002 Rev. A Page 7of 7 |
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