ACT8891 データシートの表示（PDF） - Active-Semi, Inc
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ACT8891 Datasheet PDF : 30 Pages
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ACT8891
Rev 1, 06-Sep-13
PIN DESCRIPTIONS CONT’D
PIN
NAME
DESCRIPTION
Power supply for the internal reference. Connect this pin directly to the system power supply.
23 VDDREF Bypass VDDREF to GA with a 1µF capacitor placed as close to the IC as possible. Star
connection with VP1, VP2 and VP3 preferred.
24
OUT2
Output Feedback Sense for REG2. Connect this pin directly to the output node to connect the
internal feedback network to the output voltage.
25
NC3 Connect NC3 to GA.
26
VP2
Power Input for REG2 and System Control. Bypass to GP2 with a high quality ceramic capacitor
placed as close to the IC as possible.
27
SW2 Switching Node Output for REG2. Connect this pin to the switching end of the inductor.
28
GP2
Power Ground for REG2. Connect GA, GP1,GP2 and GP3 together at a single point as close to
the IC as possible.
29
GP1
Power Ground for REG1. Connect GA, GP1,GP2 and GP3 together at a single point as close to
the IC as possible.
30
SW1 Switching Node Output for REG1. Connect this pin to the switching end of the inductor.
31
VP1
Power Input for REG1. Bypass to GP1 with a high quality ceramic capacitor placed as close to
the IC as possible.
32
REFBP
Reference Bypass. Connect a 0.047μF ceramic capacitor from REFBP to GA. This pin is
discharged to GA in shutdown.
EP
EP Exposed Pad. Must be soldered to ground on PCB.
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-6-
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