Datasheet

20-Pin HTSSOP Pin Out www.ti.com
5 20-Pin HTSSOP Pin Out
Figure 3. 20-Pin HTSSOP (top view)
Table 2. Pin Descriptions 20-Pin HTSSOP
Pin Name Function
3, 4 VIND
1
Power Input supply for Buck1.
17, 18 VIND
2
Power Input supply for Buck2.
1 VINC Power Input supply for control circuitry.
6,7 PGND
1
Power ground pin for Buck 1.
14, 15 PGND
2
Power ground pin for Buck 2.
20 AGND Signal ground pin. Place the bottom resistor of the feedback network as close as possible to pin.
9 PG
1
Power Good Indicator for Buck 1. Pin is connected through a resistor to an external supply (open
drain output).
12 PG
2
Power Good Indicator for Buck 2. Pin is connected through a resistor to an external supply (open
drain output).
8 FB
1
Feedback pin for Buck 1. Connect to external resistor divider to set output voltage.
13 FB
2
Feedback pin for Buck 2. Connect to external resistor divider to set output voltage.
5 SW
1
Output switch for Buck 1. Connect to the inductor.
16 SW
2
Output switch for Buck 2. Connect to the inductor.
2 EN
1
Enable control input. Logic high enable operation for Buck 1. Do not allow this pin to float or be
greater than VIN + 0.3V.
19 EN
2
Enable control input. Logic high enable operation for Buck 2. Do not allow this pin to float or be
greater than VIN + 0.3V.
10,11 NC No Connect.
DAP Die Attach Pad Connect to system ground for low thermal impedance, but it cannot be used as a primary GND
connection.
4
AN-1870 LM26420 Evaluation Board SNVA353B–February 2009–Revised April 2013
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