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ISL6232 Datasheet(PDF) 13 Page - Renesas Technology Corp |
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ISL6232 Datasheet(HTML) 13 Page - Renesas Technology Corp |
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13 / 25 page  ISL6232 FN9116 Rev 1.00 Page 13 of 25 April 20, 2009 Theory of Operation The ISL6232 is a high-efficiency quad output controller optimized for converting battery, wall adapter, or network DC input voltage into system supply voltages required for portable applications where high efficiency and low quiescent supply current are required. The ISL6232 includes two PWM controllers that are fixed at 5V and 3.3V respectively, or they can be programmed from 0.8V to 5.5V. Figure 30 shows its functional block diagram. ISL6232 uses a constant-frequency, 300kHz, peak current-mode PWM control scheme with 180o out-of-phase operation for reducing the input ripple current and also ESR requirement of the input capacitors. Light-load efficiency is improved by the variable-frequency pulse-skipping operation that reduces switching losses and gate-charge losses. In order to eliminate the audio noise at extremely light load condition, the ultrasonic pulse skipping mode is selectable by tying SKIP# pin to REF so that a minimum 25kHz switching frequency can be maintained. Each switching-mode step-down circuit includes two external N-MOSFETs and an LC output filter. The output voltage is the average AC voltage at PHASE node, which is regulated by changing the duty cycle of the external N-MOSFETs. The gate-drive signal to the high side MOSFET must exceed VIN voltage and is provided by a 0.1µF boost capacitor, which is connected between BOOT and PHASE. LDO5 BOOT5 UGATE5 PHASE5 LGATE5 PGND CS5 OUT5 FB5 COMP5 REF PGOOD EN5 LDO3 VIN BOOT3 UGATE3 PHASE3 LGATE3 CS3 OUT3 GND FB3 COMP3 SKIP# EN3 SHDN# VIN: 5.5V TO 22V OUT5 5V/5A OUT3 3.3V/5A Q1 IRF7807V Q2 IRF7811AV L1:6.8ˇH L2: 4.7ˇH Q3 IRF7807V Q4 IRF7811AV C1 10µF 5V ALWAYS ON C2 180µF 12m C3 270pF C4 0.1µF Rdc1:22mW R3 300k R5 390k C5 270pF C6 4.7µF C7 0.22µF C9 C10 10 C11 220µF 12m VCC C13 0.1µF VCC C12 4.7µF 3.3V ALWAYS ON C14 1µF Rdc218mW R6 100k R7:1.5k R8: 3k C8: 0.47µF R9: 1.0k R4: 2.0k C15: 0.47µF VCC REF ON OFF ISL6232 OUT5 5V/5A OUT3 3.3V/5A Q1 IRF7807V Q2 IRF7811AV L1:6.8µH Q3 IRF7807V Q4 IRF7811AV C1 10 C3 C4 0. RDC1:12m R3 R5 C5 4.7 C7 0.22 C9 0.1µF C10 10µF C11 220 C13 VCC C12 4.7 C14 1 L2:4.7µH RDC2:12m R6 100k R7: R8: VCC REF OFF OFF FIGURE 29. ISL6232 TYPICAL APPLICATION CIRCUIT WITH DCR CURRENT SENSING 6.3V 4.0V |
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