Solved by SPX2941 TM 1A Low Dropout Voltage Regulator Adjustable Output, Fast Response FEATURES SPX2941 Adjustable Output Down To 1.25V 5 Pin TO-263 Low Quiescent Current 1 2 3 4 5 Guaranteed 1.5A Peak Output Current Low Dropout Voltage of 280mV 1A Extremely Tight Load and Line Regulation Extremely Fast Transient Response APPLICATIONS Reverse-battery Protection Powering VGA & Sound Card Internal Thermal and Current Limit LCD Monitors Protection USB Power Supply Zero Current Shutdown Power PC Supplies Standard TO-220 and TO-263 packages SMPS Post-Regulator High Efficiency Linear Power Supplies Battery Charger Now Available in Lead Free Packaging Portable Instrumentation Constant Current Regulators Adjustable Power Supplies DESCRIPTION The SPX2941 is a 1A, accurate voltage regulator with a low drop out voltage of 280mV(typ.) at 1A. These regulators are specifically designed for low voltage applications that require a low dropout voltage and a fast transient response. They are fully fault protected against over-current, reverse battery, and positive and negative voltage transients. The SPX2941 is offered in 5-pin TO-220 & TO-263 packages. For a 3A version, refer to the SPX29300 data sheet. TYPICAL APPLICATIONS CIRCUIT 5 4 V V OUT IN SPX2941 EN + 2 + 10+ F 6.8 + F 3 1 R1 ADJ GND R2 Figure 1. Adjustable Output Linear Regulator Date: Sept 28-06 Rev E SPX294 A Low Dropout Linear Regulator 2006 Sipex Corporation ADJUST ENABLE GND VIN VOUTABSOLUTE MAXIMUM RATINGS Lead Temperature (soldering, 5 seconds) ................260 C Operating Junction Temperature Range......-40 C to +125 C Storage Temperature Range........................-65C to +150C Input Supply Voltage (NOTE6) .......................................16V ELECTRICAL CHARACTERISTICS V =V + 1V, I =10mA, C =6.8 + F, C =10 + F, T = 25 C, unless otherwis specified. The boldface applies over the IN OUT OUT IN OUT A junction temperature range. Adjustable versions are set at +5.0V. PARAMETER CONDITIONS MIN. TYP. MAX UNIT Reference Voltage Adjustable version only 1.228 1.240 1.252 V 1.215 1.265 Adjust Pin Bias Current 40 80 V 120 Reference Voltage (NOTE4) 20 ppm/ C Temperature Coefficient Adjust Pin Bias Current 0.1 nA/C Temperature Coefficient Line Regulation I =10mA, (V +1V)) V ) 16V 0.2 1.0 % OUT OUT IN Load Regulation V =V +1V, 10mA ) I ) I 0.3 1.5 % IN OUT OUT FULL Dropout Voltage (Note1) I =100mA 70 200 mV OUT (except 1.8V version) I =1A 280 550 OUT Ground Current (Note3) I =750mA, V =V +1V 12 25 mA OUT IN OUT I =1A 18 OUT Ground Pin Current at V =0.1V less than specified V , 1.2 mA IN OUT Dropout I =10mA OUT Current Limit V =0V (Note2) 1.5 2.2 A OUT Output Noise Voltage 10Hz to 100kHz, I =100mA, OUT C =10 + F 400 + V L RMS C =33 + F 260 L Input Logic Voltage LOW (OFF) V <10V 0.8 V IN HIGH (ON) 2.4 ENABLE Input Pin Current V =16V 100 600 + A EN 750 V =0.8V 1 + A EN 2 Regulator Output Current (NOTE5) 10 + A in Shutdown 500 Thermal Resistance TO-220 Junction to Case, at Tab 3 C/W Junction to Ambient 29.3 TO-263 Junction to Case, at Tab 3 C/W Junction to Ambient 31.2 NOTE1: Dropout voltage is defined as the input to output differential at which the output voltage drops to 99% of its nominal value. NOTE2: V =V +1V for example, V =4.3V for a 3.3V regulator. Employ pulse-testing procedures to IN OUT(NOMINAL) IN minimize temperature rise. NOTE3: Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load and ground currents. NOTE4: Thermal regulation is defined as the change in the output voltage at a time T after a change in power dissipation is applied, excluding load or line regulation effects. NOTE5: V ) 0.8V and V ) 16V, V = 0. EN IN OUT NOTE6: Maximum positive supply voltage of 20V must be of limited duration ( <100ms) and duty cycle (<1%). The maximum continuous supply voltage is 16V. NOTE7: V ) V ) (V -1), 2.5V ) V ) 16V, 10 mA ) I ) I , T < T . REF OUT IN IN C FL J JMAX Date: Sept 28-06 Rev E SPX294 A Low Dropout Linear Regulator 2006 Sipex Corporation 2 BLOCK DIAGRAM IN OUT O.V I LIMIT 1.240V 28V R1* + Reference - ADJ EN Thermal Shutdown R2* GND Figure 2. SPX2941 Block Diagram