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LT1432-3.3 Datasheet(PDF) 8 Page - Linear Technology |
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LT1432-3.3 Datasheet(HTML) 8 Page - Linear Technology |
8 / 8 page 8 LT1432-3.3 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7487 (408) 432-1900 q FAX: (408) 434-0507 q TELEX: 499-3977 © LINEAR TECHNOLOGY CORPORATION 1992 S APPLICATI I FOR ATIO PACKAGE DESCRIPTIO LT/GP 0895 2K REV A • PRINTED IN USA PART NUMBER DESCRIPTION COMMENTS LTC1148 High Efficiency Step-Down Switching Regulator Controller 5V Regulated Output Voltage LT1432 High Efficiency Synchronous Step-Down Switching Regulator Adjustable and Fixed 5V or 3.3V Outputs LT1507 1.5A, 500kHz Step-Down Switching Regulator Fixed Frequency PWM for Low Input Voltages from 4.5V to 12V RELATED PARTS 1 2 3 4 0.150 – 0.157** (3.810 – 3.988) 8 7 6 5 0.189 – 0.197* (4.801 – 5.004) 0.228 – 0.244 (5.791 – 6.197) 0.016 – 0.050 0.406 – 1.270 0.010 – 0.020 (0.254 – 0.508) × 45° 0 °– 8° TYP 0.008 – 0.010 (0.203 – 0.254) SO8 0695 0.053 – 0.069 (1.346 – 1.752) 0.014 – 0.019 (0.355 – 0.483) 0.004 – 0.010 (0.101 – 0.254) 0.050 (1.270) BSC DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE * ** S8 Package 8-Lead Plastic SOIC N8 Package 8-Lead Plastic DIP N8 0695 0.005 (0.127) MIN 0.100 ± 0.010 (2.540 ± 0.254) 0.065 (1.651) TYP 0.045 – 0.065 (1.143 – 1.651) 0.130 ± 0.005 (3.302 ± 0.127) 0.015 (0.380) MIN 0.018 ± 0.003 (0.457 ± 0.076) 0.125 (3.175) MIN 12 3 4 87 6 5 0.255 ± 0.015* (6.477 ± 0.381) 0.400* (10.160) MAX 0.009 – 0.015 (0.229 – 0.381) 0.300 – 0.325 (7.620 – 8.255) 0.325 +0.025 –0.015 +0.635 –0.381 8.255 () *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm) Full Shutdown When the Mode pin is driven high, full shutdown of the regulator occurs. Regulator input current will then consist of the LT1432 shutdown current ( ≈15µA) plus the switch leakage of the switching IC ( ≈1µA to 25µA). Mode input current ( ≈15µA at 5V) must also be considered. Start-up from shutdown can be in either normal or Burst Mode operation, but one should always check start-up over- shoot, especially if the output capacitor or frequency compensation components have been changed. normal mode, then switching to normal mode, pausing for 1ms, followed by return to full load. If this sequence is not possible, an alternative is to increase the output capacitor to > 680 µF. This modifica- tion will often allow the power-down sequence to consist of simultaneous turn-off of load current and switch to Burst Mode operation. Power-up is accomplished by switching to normal mode and simultaneously increasing load current to the lowest possible value (30mA to 500mA), followed by a short pause and return to full load current. Dimensions in inches (millimeters) unless otherwise noted. |
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