SE2138 1.5A CMOS Elektronische Bauelemente Low Dropout Voltage Regulator RoHS Compliant Product Description The SE2138 positive,linear regulators feature low quiescent current (45µA typ.) with low dropout voltage, making them ideal for battery applications.These rugged devices have both Thermal Shutdown and Current Fold-back to prevent device failure under the "Worst" of operating conditions.The SE2138 is stable with an output capacitance of 4.7µF or greater. Features * Low Temperature Coefficient REF. * Over-Temperature Shutdown A b c D E L4 L5 * Very Low Dropout Voltage * High Accurate ± 1.5% * Short Circuit Current Fold-back * Guaranteed 1.5A output * Current Limiting Millimeter Min. Max. 4.40 4.80 0.76 1.00 0.36 0.50 8.60 9.00 9.80 10.4 14.7 15.3 6.20 6.60 REF. c1 b1 L e L1 Ø A1 Millimeter Min. Max. 1.25 1.45 1.17 1.47 13.25 14.25 2.54 REF. 2.60 2.89 3.71 3.96 2.60 2.80 Applications * PC Peripherals * Wireless Devices * Portable Electronics * Battery Powered Widgets * Instrumentation Functional Block Diagram Typical Circuit SE2138 Ordering Information(contd.) Part Number SE2138-15 SE2138-19 SE2138-33 SE2138-50 http://www.SeCoSGmbH.com/ 01-Jun-2002 Rev. A Marking 8T152 XXXX 8T192 XXXX 8T332 XXXX 8T502 XXXX Output Voltage Part Number 1.5V SE2138-18 1.9V SE2138-25 3.3V SE2138-47 Marking Output Voltage 8T182 XXXX 8T252 XXXX 8T472 XXXX 1.8V 2.5V 4.7V 5.0V Any changing of specification will not be informed individual Page 1 of 5 SE2138 1.5A CMOS Elektronische Bauelemente Low Dropout Voltage Regulator Absolute Maximum Ratings Parameter Symbol Ratings Unit Input Max Voltage VIN 8 V Output Current IOUT PD/( VIN- VO) A Output Voltage VOUT 1.5~5.0 V Operating Ambient Temperature Topr -40 ~ +85 Junction Temperature Tj -40 ~ +125 Tj Max 150 jc (Non-Conductive Epoxy)* 24 /W ja 80 /W PD 1.6 Maximum Junction Temperature Thermal Resistance Internal Power Dissipation EDS Classification W B *Measure jc on backside center of tab. Electrical Characteristics VIN=VOUT(T)+2V, Ta=25 Parameter unless otherwise noted Condition Output Voltage Symbol VOUT (E) Output Current Current Limit Load Regulation IO ILIM REGLOAD Dropout Voltage Quiescent Current Ground Pin Current Line Regulation Input Voltage Over Temperature Shutdown Over Temperature Hysterisis Output Voltage Temperature Coefficient Short Circuit Current Power Supply Rejection Output Voltage Noise Min TYP Max Unit IO=1mA -1.5% VOUT(T) 1.5% V VO>1.2V 1.5 - - A VO>1.2V 1.5 2.0 - A VIN=VOUT(T)+2V, IO=1mA to 1.5A -1 0.2 1 % 1.4V<VOUT(T) 2.0V - - 1300 2.0V<VOUT(T) 2.8V - - 800 (Note1) VDROPOUT IO=1.5A VO=VOUT(E)-2% 2.8V<VOUT(T) (Note2) mV - - 600 IQ VIN= VOUT(T)+2V, IO=0mA - 45 70 A IGND VIN= VOUT(T)+2V, IO=1mA~1.5A - 45 - A VOUT(T)<2.0V -0.15 - 0.15 2.0V VOUT(T)<4.0V -0.1 0.02 0.1 4.0V VOUT(T) -0.4 - 0.4 VIN OTS OTH Note3 - 7 - 150 - - 30 - TC - 30 - ppm/ VIN=VOUT(T)+1V, VOUT<0.4V - 750 - mA f=100Hz f=1kHz f=10kHz - 70 50 20 - dB - 30 - Vrms REGLINE ISC PSRR eN IO=1mA VIN=VOUT VOUT(T)+2 Io=100mA Co=4.7 F f=10Hz~100kHz, Io=10mA, Co=4.7 F % V 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 I OUT value). 2: VOUT (T) =Specified Output Voltage 3: VIN (MIN) =V OUT+VDROPOUT http://www.SeCoSGmbH.com/ 01-Jun-2002 Rev. A Any changing of specification will not be informed individual Page 2 of 5 SE2138 1.5A CMOS Elektronische Bauelemente Low Dropout Voltage Regulator Detailed Description The SE2138 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 exceeds150 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 SE2138 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 SE2138 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. Characteristics Curve (T)+1 to h tp://www.SeCoSGmbH.com/ 01-Jun-2002 Rev. A Any changing of specification will not be informed individual Page 3 of 5 SE2138 Elektronische Bauelemente http://www.SeCoSGmbH.com/ 01-Jun-2002 Rev. A 1.5A CMOS Low Dropout Voltage Regulator Any changing of specification will not be informed individual Page 5 of 5 SE2138 Elektronische Bauelemente http://www.SeCoSGmbH.com/ 01-Jun-2002 Rev. A 1.5A CMOS Low Dropout Voltage Regulator Any changing of specification will not be informed individual Page 5 of 5