6
FN6270.0
May 15, 2006
Pin Descriptions
PIN NAME EL7642A EL7641A EL7640A PIN FUNCTION
SRC 1 1 1 Upper reference voltage for switch output
REF 2 2 2 Internal reference bypass terminal
AGND 3 3 3 Analog ground for boost converter and control circuitry
PGND 4 4 4 Power ground for boost switch
OUT1 5 5 5 Operational amplifier 1 output
NEG1 6 6 6 Operational amplifier 1 inverting input
POS1 7 7 7 Operational amplifier 1 non-inverting input
OUT2 8 8 - Operational amplifier 2 output
NEG2 9 9 - Operational amplifier 2 inverting input
POS2 10 10 - Operational amplifier 2 non-inverting input
BGND 11 11 11 Operational amplifier ground
POS3 12 15 - Operational amplifier 3 non-inverting input
NEG3 - 16 - Operational amplifier 3 inverting input
OUT3 13 17 - Operational amplifier 3 output
SUP 14 14 14 Amplifier positive supply rail. Bypass to BGND with 0.1µF capacitor
POS4 15 - - Operational amplifier 4 non-inverting input
NEG4 16 - - Operational amplifier 4 inverting input
OUT4 17 - - Operational amplifier 4 output
POS5 18 - - Operational amplifier 5 non-inverting input
NEG5 19 - - Operational amplifier 5 inverting input
OUT5 20 - - Operational amplifier 5 output
LX 21 21 21 Main boost regulator switch connection
IN 22 22 22 Main supply input; bypass to AGND with 1µF capacitor
FB 23 23 23 Main boost feedback voltage connection
COMP 24 24 24 Error amplifier compensation pin
FBP 25 25 25 Positive LDO feedback connection
DRVP 26 26 26 Positive LDO transistor drive
FBN 27 27 27 Negative LDO feedback connection
DRVN 28 28 28 Negative LDO transistor driver
DEL 29 29 29 Connection for switch delay timing capacitor
CTL 30 30 30 Input control for switch output
DRN 31 31 31 Lower reference voltage for switch output
COM 32 32 32 Switch output; when CTL = 1, COM is connected to SRC through a 15
resistor; when CTL = 0, COM is connected to DRN through a 30 resistor
EL7640A, EL7641A, EL7642A