LM26420, LM26420-Q0, LM26420-Q1
SNVS579J –FEBRUARY 2009–REVISED SEPTEMBER 2015
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Pin Functions 20-Pin HTSSOP
PIN
TYPE
DESCRIPTION
NUMBER
NAME
VINC
EN1
1
2
A
A
Input supply for control circuitry.
Enable control input. Logic high enable operation for Buck 1. Do not allow this pin to float or
be greater than VIN + 0.3 V.
3, 4
5
VIND1
SW1
A
P
G
A
G
Power Input supply for Buck 1.
Output switch for Buck 1. Connect to the inductor.
Power ground pin for Buck 1.
6,7
8
PGND1
FB1
Feedback pin for Buck 1. Connect to external resistor divider to set output voltage.
9
PG1
Power Good Indicator for Buck 1. Pin is connected through a resistor to an external supply
(open drain output).
10, 11, DAP
12
Die Attach Pad
PG2
—
G
Connect to system ground for low thermal impedance, but it cannot be used as a primary
GND connection.
Power Good Indicator for Buck 2. Pin is connected through a resistor to an external supply
(open drain output).
13
FB2
PGND2
SW2
A
G
P
A
A
Feedback pin for Buck 2. Connect to external resistor divider to set output voltage.
Power ground pin for Buck 2.
14, 15
16
Output switch for Buck 2. Connect to the inductor.
Power Input supply for Buck 2.
17, 18
19
VIND2
EN2
Enable control input. Logic high enable operation for Buck 2. Do not allow this pin to float or
be greater than VIN + 0.3 V.
20
AGND
G
Signal ground pin. Place the bottom resistor of the feedback network as close as possible to
pin.
4
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