Preliminary PJ1537 Dual 1A Low Dorpout Fixed Voltage Regulators T he PJ1537 provides 2 output voltage : 3.3V and either 2.5V or 1.8V fixed with 1.0A each output current TO-263-5L capability. These devices have been optimized for low voltage where transient response and miniumum input voltage critical. Current limit features protect the outputs against short circuit currents. On-chip thermal limiting provides protection against any combination of overload and ambient temperature Pin 1. VIN 2. NC 3. GND 4. V1 5. V2 that would create excessive junction temperatures. The PJ1537 series regulators are available in 5-lead TO-263 power packages. FEATURES z Hard Disk Drives, CD-ROMs, DVDs z High efficiency linear regulators z Post regulators for switching supplies z ORDERING INFORMATION ADSL and Cable Modems z 5V to 3.3V and 2.5V linear regulators z Motherboard with multiple supplies Device Operating Temperature Package PJ1537CM 0℃ TO 75℃ TO-263 APPLICATIONS z Battery protection z Load switch z Power management BLOCK DIAGRAM 1-3 2003/02.rev.A Preliminary PJ1537 Dual 1A Low Dorpout Fixed Voltage Regulators MAXIMUM RATINGS Parameter Symbol Value Unit Input Voltage VIN 10 V Operating Junction Temperature Range TJ 0 to 150 ℃ Storage Temperature Range Tstr -65 to 150 ℃ - 300 ℃ Lead Temperature(Soldering, 10sec) ELECTRICAL CHARACTERISTICS(VIN≦7V, TJ=25℃(unless otherwise specified)) The Denotes specifications which apply over the specified operating temperature range of 0℃ to 125℃ junction temperature. Characteristics Symbol Output Voltages 1 Vout1 Output Voltages 2 Vout2 Time to Output Voltages Valid Line Regulation 1,2(both Outputs) RegLine Dropout Voltage(3.3 output) Vdrop Current Limit(Both outputs) Ilmt Minimum Load Current(Both outputs) Quiescent Current Ripple Rejection 3(both outputs) Long-Term Stability Ripple Rejection Iload(min) IQ GRR2 GRR Thermal Resistance, Junction to case - Thermal Shutdown - Thermal Shutdown Hysteresis - Conditions Min. Typ. Max. Unit -2％ - +2％ V 3.2 - - V From VIN≧4.75V - 5 - msec 4.75V≦VIN≦7V,IOUT=10mA - 0.005 0.5 ％ 4.75V≦VIN≦7V,IOUT=1mA - 0.05 0.5 ％ △VOUT= 1﹪,IOUT=1A - 1.1 1.3 V VIN=5V 1.0 1.5 - A 4.75V≦VIN≦7V 1.0 - - mA - 6 15 mA 60 - - dB - 0.03 1.0 ％ 60 2.5 - dB - 2 - ℃/W - 155 - ℃ - 10 - ℃ 10mA≦IOUT≦1A 4.75V≦VIN≦7V 10mA≦IOUT≦1A 4.75V≦VIN≦7V VIN=7V F=120Hz, COUT=22Μf Tantalum, VIN=5V, IOUT=1A TA=125℃, 1000hrs TA=125℃, 10Hz≦f≦10kHz TO-263 Junction Temperature Notes: 1. See thermal regulation sperifications for changes in output voltage due to heation effects. Load and line regulation are measured at a constant junction temperature by low duty cycle pulse testing. 2. Power dissipation is determined by input/output differential and the output current. Guaranteed maximum output power will not be available over the full input/output voltage range. 2-3 2003/02.rev.A Preliminary PJ1537 Dual 1A Low Dorpout Fixed Voltage Regulators TO-263-5L DIMENSION DIM MIN MAX MIN MAX A 10.22 10.26 0.402 0.404 B 14.60 15.87 0.575 0.625 C 0.75 0.77 0.030 0.030 D 1.573 1.827 0.062 0.072 E 4.56 4.57 0.179 0.180 F 1.24 1.27 0.049 0.05 G 2.28 2.79 0.090 0.110 H 0.28 0.32 0.011 0.013 I 8.24 8.28 0.324 0.326 J 1.54 1.80 0.060 0.071 E A F J I B G C H D 3-3 INCHES MILLIMETERS 2003/02.rev.A