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LTC1649CS Datasheet(PDF) 5 Page - Linear Technology |
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LTC1649CS Datasheet(HTML) 5 Page - Linear Technology |
5 / 16 page 5 LTC1649 BLOCK DIAGRA – + – + ILIM FB MIN PWM MAX + 40mV + 1.26V 12 µA 40mV 12 µA PVCC1 CPOUT C+ SHDN COMP SS IMAX VCC PVCC2 G1 G2 IFB FB 1649 BD INTERNAL SHUTDOWN 50 µs DELAY VIN CHARGE PUMP C– TEST CIRCUIT Figure 1 VCC VOUT 2.5V IMAX SHDN 1 µF G2 FB VIN VIN 3.3V C+ LTC1649 PVCC2 PVCC1 G1 IFB COMP SS C– GND CPOUT 1 µF 10 µF MBR0530 0.1 µF CC 0.01 µF RC 7.5k LEXT 1.2 µH C1 220pF 10 µF MBR0530 RIMAX 50k 22 Ω 1k Q3 IRF7801 Q1, Q2 IRF7801 TWO IN PARALLEL COUT 4400 µF CIN 3300 µF SHDN R2 12.7k R1 12.4k 1649 TA03 + 0.33 µF + + + |
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