ACT8740
Rev PrB, 25-Feb-08
PIN DESCRIPTIONS CONT’D
PIN
NAME
DESCRIPTION
Reference Noise Bypass. Connect a 0.01µF ceramic capacitor from REFBP to GA. This pin is
discharged to GA in shutdown.
18
REFBP
Feedback Sense for REG2. Connect this pin to the LED string current sense resistor to sense
the LED current.
19
20
FB2
Over-Voltage Protection Input for REG2. Connect this pin directly to the output node to sense
and prevent over-voltage conditions.
OVP2
Power Ground for REG2. Connect GP2 directly to a power ground plane. Connect GA, GP1
and GP2 together at a single point as close to the IC as possible.
21
22
GP2
SW2
Switching Node Output for REG2. Connect this pin to the switching end of the inductor.
Tri-State Charging State Select Input. When ISET1[ ] = [0000], drive CHGLEV to VSYS or to a
logic high for high-current charging mode (450mA), and drive to GA or a logic low for low-
current charging mode (90mA). Allow CHGLEV to float (|ICHGLEV| < 2µA) to disable the charger.
23
CHGLEV
Output Voltage for the Battery Charger. Connect this pin directly to the battery anode (+ termi-
nal) to sense the battery voltage.
24
BAT
EP
EP
Exposed Pad. Must be soldered to ground on PCB.
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