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LT1507 Datasheet(PDF) 5 Page - Linear Technology |
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LT1507 Datasheet(HTML) 5 Page - Linear Technology |
5 / 12 page 5 LTC1504A TEST CIRCUITS IMAX SHDN SS COMP VCC GND SW FB/SENSE + CIN 100 µF VCC NC 0.01 µF + COUT 220 µF VOUT LEXT 47 µH CIN: AVX TPSE107M016R0125 COUT: SANYO 16CV220GX LEXT: COILCRAFT D03316-473 1504A • TC01 LTC1504A 1 µF 0.1 µF 220pF 7.5k Figure 1 + – VREF LTC1504A COMP FB/SENSE A B A: TEST VOL, IOL B: TEST VOH, IOH 1504A • TC02 Figure 2 BLOCK DIAGRAM Figure 3. Block Diagram + – +– FB –+ ILIM + – 1.265V 12 µA 12 µA PWM 12.6k 20.4k Q1 Q2 SW FB (ADJ ONLY) SENSE (–3.3V ONLY) SAW IMAX SS COMP SHDN 1504A • BD VREF VCC TO INTERNAL BLOCKS APPLICATIONS INFORMATION OVERVIEW The LTC1504A is a complete synchronous switching regulator controller (see Block Diagram). It includes two on-chip 1.3 Ω power MOSFETs, eliminating the need for external power devices and minimizing external parts count. The internal switches are set up as a synchronous buck converter with a P-channel device (Q1) from the input supply to the switching node and an N-channel device (Q2) as the synchronous rectifier device from the switching node to ground. An external inductor, input and |
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