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| Dual Low Drop Out Regulator BA3257FP/HFP Description BA3257FP/HFP is a power supply IC in which 2-output series regulators are incorporated into a power package (TO252-5/HRP-5). 2-outputs are 3.3V and a variable output.(Above 1.5V can be set.) Each current is 1A. Ceramic capacitor is available for output. Dimension (Unit : mm) BA3257FP 1.50.2 6.50.2 +0.2 5.1-0.1 2-C0.5 2.30.2 0.50.1 Ceramic Capacitor Available 5.50.2 1.5 0.8 0.5 1.27 0.50.1 1.00.2 1.0170.2 Features 1) 3.3V/1A and Variable(1.25V standard)/1A 2) Output ceramic capacitor available 3) Output voltage accuracy :+/-2% 4) Built-in over-current and thermal protection circuit 5) TO252-5 package and HRP-5 package TO252-5 BA3257HFP 9.390.125 8.820.1 (5.59) 1.9050.1 (7.49) 2.5 1 2 3 4 5 9.50.5 2 3 4 5 Applications HDD/DVD 1.2575 1 4.5 + 5.5 - 4.5 + 0.1 0.27 - 0.05 S 0.080.05 1.72 0.730.1 D 0 .0 8 S HRP-5 Absolute Maximum Ratings (Ta=25C) Parameter Power supply voltage Power dissipation HRP-5 TO252-5 Symbol VCC Pd Topr Tstg 0 -55 Limits 15 2300 1300 ~ ~ +85 +150 1 2 Unit V mW Operating temperature range Storage temperature range 1 Derating : 18.4mW/C for operation above Ta=25C PCB (70mmx70mm, t=1.6mm) glass epoxy mounting. 2 Derating : 10.4mW/C for operation above Ta=25C PCB (70mmx70mm, t=1.6mm) glass epoxy mounting. C C Recommended Operating Conditions (Ta=25C) Parameter Symbol VCC Min. Power supply voltage 4.75 Typ. - Max. 14.0 Unit V 0.8350.2 1.5230.15 10.540.13 8.00.13 Electrical characteristics (Unless otherwise noted; Ta=25C, Vcc=5V, R1=R2=5k) Parameter Circuit current Line regulation 1,2 Load regulation 1,2 [3.3V output] Output voltage Dropout voltage Output current [Variable output] Reference voltage Dropout voltage Output current Symbol Ib VLINE1,2 VLOAD1,2 Vo1 VD1 Io1 Vref VD2 Io2 Min. 3.234 1.0 1.225 1.0 Typ. 3 5 5 3.300 1.1 1.250 1.1 Max. 5 15 20 3.366 1.3 1.275 1.3 Unit mA mV mV V V A V V A Io2=50mA Io2=1A, R1=8.2k, R2=5k Conditions Io1=0mA, Io2=0mA Vcc=4.75 14V, Io1=5mA Io2=5mA 1A Io1=50mA Io1=1A Application Circuit VO1 5 3.3V CO1 1F VOUT2=VREF X (1+R1/R2)+IADJ X R1 VO2 4 Current Limit ADJ GND FIN Thermal Shutdown Current Limit CO2 1F ADJ 2 R1 R2 VREF BA3257FP/HFP 1 VCC VIN CIN 3.3F |
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