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SC4624 Datasheet(PDF) 9 Page - Semtech Corporation |
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SC4624 Datasheet(HTML) 9 Page - Semtech Corporation |
9 / 20 page 9 2007 Semtech Corp. www.semtech.com SC4624 POWER MANAGEMENT Pin Descriptions Pin SO-16 Pin MLPQ-20 Pin Name Pin Functions 6 1 PVIN1 Power supply voltage for high side MOSFETs. 8 2 ISET Current limit setting pin. A resistor connected between ISET and AGND sets the over current protection threshold. A ceramic decoupling between ISET pin to AGND have to be reserved to prevent from noise influence. 9 3 SS Soft start time setting pin. A cap connected from this pin to GND sets the soft start up time. 10 4 FS Oscillator frequency setting pin. An external resistor connected from this pin to GND sets the oscillator frequency. 11,15 5,12 VCC Power supply voltage for the analog section of the controller. 12 6 PGOOD Power good indicator. It is an open drain output. Low when the output is below the power good threshold level. 7,8,9 NC No connection. 13 10 COMP This is the output of the error amplifier. The voltage at this point is connected to the inverting input of the PWM comparator. A compensation network is required in order to optimize the dynamic performance of the voltage mode control loop. 14 11 FB The inverting input of the error amplifier. It serves as the output voltage feedback point for the buck controller. It senses the output voltage through an external divider. 16 13 AGND Analog signal gound. 1 14 SYNC/EN The oscillator frequency of the SC4624 is set by FS when SYNC/EN is pulled and held above 2V. Its synchronous mode is activated as SYNC/EN is driven by an exter- nal clock. Its shutdown mode is invoked if SYNC/EN is pulled and held below 0.8V. 2 15 PGND1 Power ground. 3 16 PGND2 Power ground. 4 17 PH1 Switching nodes 5 18 PH2 Switching nodes 19 PH3 Switching nodes 7 20 PVIN2 Power supply voltage for high side MOSFETs. THERMAL PAD Pad for heatsinking purposes only. Connect to ground plane using multiple vias. Not electrically connected internally. |
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