ACT6390/ACT6391
Rev0, 13-May-08
ORDERING INFORMATION
PART
NUMBER
ACT6390MH-T
ACT6391MH-T
CURRENT
LIMIT
1.7A
2.5A
TEMPERATURE
RANGE
-40°C to 85°C
-40°C to 85°C
PACKAGE
MSOP-8
MSOP-8
PINS
8
8
PACKAGING
TAPE & REEL
TAPE & REEL
PIN CONFIGURATION
COMP
FB
EN
G
1
2
3
4
8
SS
FREQ
IN
SW
ACT6390
ACT6391
7
6
5
MSOP-8
PIN DESCRIPTIONS
PIN
1
2
3
4
5
6
7
8
NAME
COMP
FB
EN
G
SW
IN
FREQ
SS
DESCRIPTION
Error Amplifier Compensation Node. Connect to a resistor R
C
and capacitor C
C
in series to
ground.
Feedback Input. Connect this pin a resistor divider from the output to set the output voltage. FB
is regulated to 1.24V.
Enable Control. Connect to a logic high level to enable the IC. Connect to a logic low level to
disable the IC. When unused, connect EN pin to IN (do not leave pin floating).
Ground.
Switch Output. Connect this pin to the inductor and the schottky diode. To minimize EMI, mini-
mize the PCB trace path between this pin and the input bypass capacitor.
Supply Input. Bypass to G with a 1µF or larger capacitor.
Frequency Setting Pin. A logic low sets the switching frequency at 700kHz. A logic high sets
the switching frequency at 1.3MHz. This pin has an internal 5.5µA pull-down current.
Soft Start Control Input. Connect a capacitor from this pin to G to set soft-start timing duration
(t
SS
= 2.2 x 10
5
x C
SS
). SS is discharged to ground in shutdown. SS may be left unconnected if
soft start is not desired.
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TM
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ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
