SPX1583 1.5A Ultra Low Dropout Voltage Regulator Fast Response, Adjustable & Fixed FEATURES APPLICATIONS Low Dropout Voltage 500mV at 1.5A Full Load Current 3.3V to 2.8V ATX Power Supplies Adjustable Output Down to 1.2V from ATX Power Supply 3.3V to 2.9V for Portable PENTIUM Processor Fixed Output Voltages of 3.3V, 2.8V, 2.5V, and 1.5V 5V to 3.5V VRE Supply Extremely Tight Voltage and Line Regulation High Efficiency Green Computer Systems Standard 5-Terminal Low Cost TO-220 & TO-263 Now Available in Lead Free Packaging PRODUCT DESCRIPTION The SPX1583 is a 1.5A Low Dropout Regulator with extremely low dropout voltage. The adjustable version requires only tw o external resistors to set the output voltage. The fixed version has a preset output of 3.3V, 2.8V or 2.5V and does not require any external resistors. The SPX1583 features a low dropout of less than 400mV(typ.) and offers fast transient response. T h is device is suitable for Pentium applications requiring 2.8V or 2.5V from 3.3V ATX power supplies, where a low current input voltage 1V greater than the output voltage is needed. With an external sense pin the load regulation is less than 1mV. This devi c e is an excellent choice for the use in powering low voltage microprocessors that require a lower dropout, fast transient response to regu late from 3.3V and 5V supplies. The SPX1583 is also an excellent choice as a post regulator for switching supplies applications. The SPX1583 offers full protection against over-current faults, reversed input polarity, over temperature operation and positive and negative transient voltage. The SPX1583 is offered in a 5 pin TO-220 and TO-263 compatible with industry standard 5-terminal regulators. For 7A, 5 A and 3A ultra low dropout versions refer to SPX1580, SPX1581 and SPX1582 data sheets respectively. PIN CONNECTIONS TO-263-5 (T) TO-220-5 (U) SPX1583 1. SENSE 1. SENSE 2. ADJ or FIXED 2. ADJ or FIXED 1 2 4 5 3 SPX1583 3. V 3. V OUT OUT 1 2 4 3 5 4. V 4. V CTRL CTRL 5. V 5. V IN IN Top View Front View Date: Jun 24-04 SPX1583 ABSOLUTE MAXIMUM RATINGS Power Dissipation.................................................... Internally Limited Input Supply Voltage ..........................................................6V V Input Voltage ..........................................................13V Lead Temp (soldering, 10 seconds)........................................... 300C CTRL Storage Temperature Range ...................................... -65C to +150C Operating Junction Temperature Range SPX1583 Control Section .............................................0C to +125C SPX1583 Power Transistor ...........................................0C to +150C ELECTRICAL CHARACTERISTICS at V =14V, T =25C, Io=10mA, C2=100 F, unless otherwise specified. (Note 1) S A (Boldface applies over full temperature range). Parameters Conditions SPX1583 Units Min Typ Max 2.5V Version V =6.0V to 12V, V =3.0V to 5.0V, I =10mA 2.450 2.500 2.550 V Output Voltage CTRL IN O I =10mA to 1.5A O 2.400 2.600 2.8V Version V =6.3V to 12V, V =3.3V to 12V, I =10mA 2.744 2.800 2.856 V Output Voltage CTRL IN O I =10mA to 1.5A 2.688 2.912 O 3.3V Version V =6.3V to 12V, V =3.3V to 12V, I =10mA 3.234 3.300 3.366 V Output Voltage CTRL IN O I =10mA to 1.5A 3.168 3.432 O All Voltage Options V =2.75V, V =2.00V, I =10mA 1.237 1.250 1.263 V Reference Voltage CTRL IN O V =2.7V to 12V, V =2.05V to 5.5V, I =10mA to CTRL IN O 1.5A V =2.5V to 12V, V =1.75V to 5.5V, I =10mA Line Regulation CTRL IN O V =0V 1.0 3.0 mV ADJ V =2.75V, V =2.1V, I =10mA to 1.5A,V =0V mV Load Regulation (Note1) CTRL IN O ADJ 1.0 5.0 V =0V 1.00 1.15 V Dropout Voltage Minimum V ADJ CTRL V =2.05V, I =1A IN O (Note2) (V V ) CTRL OUT V =0V 0.40 0.50 V Dropout Voltage Minimum ADJ V =2.75V, I =1.5A IN O V (Note2) IN (V - V ) IN OUT V =2.75V, V =2.05V,dV =100mV,V =0V 1.6 A Current Limit CTRL IN O ADJ V =5V, V =3.3V,V =0V 5 10 mA Minimum Load Current CTRL IN ADJ 0.002 0.02 %W Thermal Regulation 30ms Pulse V =3.75V V =3.75V, I =2.1.5A,V =0V 60 80 dB Ripple Rejection CTRL IN O ADJ T =25, V =1Vpp at 120Hz J RIPPLE V =0V 60 120 Control Pin Current ADJ V =2.75V, V =2.05V, I =1.5A mA CTRL IN O Adjustable Pin Current VCTRL=2.75V, VIN=2.05V,VADJ=0V IO=10mA 50 90 A TO-220-5 Junction to Case ( ) 3 C/W Thermal Resistance JC 50 Junction to Ambient ( ) C/W JA TO-263-5 Junction to Case ( ) 3 C/W JC Junction to Ambient ( ) 60 C/W JA The Bold specifications applying to the over full operating temperature range. Note 1: Low duty cycle pulse testing with Kelvin connections is required to order to maintain accurate data. Note 2: Dropout voltage is defined as the minimum differential between V and V or V and V required to maintain regulation at V IN OUT CTRL OUT OUT 99% Nominal V OUT. Note 3: V is measured across Adjust pin to Sense pin. REF Date: Jun 24-04