SE2138 SECOS | Alldatasheet
Document overview
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Technical content
Features
- Low Temperature Coefficient * Over-Temperature Shutdown * Very Low Dropout Voltage * High Accurate 1.5% * Short Circuit Current Fold-back * Guaranteed 1.5A output * Current Limiting * Portable Electronics
Applications
- PC Peripherals * Wireless Devices * Battery Powered Widgets * Instrumentation SE2138 SE2138-15 Part Number Marking Output Voltage Part Number Marking Output Voltage 8T152 1.5VXXXX Ordering Information(contd.) SE2138-19 8T192 1.9VXXXX SE2138-18 8T182 1.8VXXXX SE2138-25 8T252 2.5VXXXX SE2138-33 8T332 3.3VXXXX SE2138-50 8T502 5.0VXXXX SE2138-47 8T472 4.7VXXXX
http://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual 01-Jun-2002 Rev. A Page 2 of 5 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 : Maximum Junction Temperature Tj Max 150 : jc (Non-Conductive Epoxy)* 24 /W: Thermal Resistance ja 80 /W: Internal Power Dissipation PD 1.6 W EDS Classification B *Measure jc on backside center of tab. Electrical Characteristics VIN=VOUT(T)+2V, Ta=25: unless otherwise noted Parameter Symbol Condition Min TYP Max Unit Output Voltage VOUT(E) (Note1) IO=1mA -1.5% VOUT(T) (Note2) 1.5% V Output Current IO VO>1.2V 1.5 - - A Current Limit ILIM VO>1.2V 1.5 2.0 - A Load Regulation REGLOAD 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 Dropout Voltage VDROPOUT IO=1.5A VO=VOUT(E)-2% 2.8V<VOUT(T) - - 600 mV Quiescent Current IQ VIN= VOUT(T)+2V, IO=0mA - 45 70 A Ground Pin Current IGND VIN= VOUT(T)+2V, IO=1mA~1.5A - 45 - A IO=1mA VIN=VOUT VOUT(T)+2 4.0VVOUT(T) -0.4 - 0.4 Input Voltage VIN Note3 - 7 V Over Temperature Shutdown OTS - 150 - : Over Temperature Hysterisis OTH - 30 - : Output Voltage Temperature Coefficient TC - 30 - ppm/: Short Circuit Current ISC VIN=VOUT(T)+1V, VOUT<0.4V - 750 - mA f=100Hz - 70 - f=1kHz - 50 - Power Supply Rejection PSRR Io=100mA Co=4.7F f=10kHz - 20 - dB Output Voltage Noise eN f=10Hz~100kHz, Io=10mA, Co=4.7F - 30 - Vrms 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: V OUT (T) =Specified Output Voltage 3: V IN (MIN) =VOUT+VDROPOUT SE2138 1.5A CMOS Low Dropout Voltage Regulator
01-Jun-2002 Rev. A Page 3 of 5 h tp://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual Elektronische Bauelemente (T)+1 to 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 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 120 C.The SE2138 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 . o o 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. Ω Ω Characteristics Curve SE2138 1.5A CMOS Low Dropout Voltage Regulator
01-Jun-2002 Rev. A Page 5 of 5 http://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual SE2138 1.5A CMOS 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 5 SE2138 1.5A CMOS Low Dropout Voltage Regulator