Datasheet

LM26484
www.ti.com SNVS573F –SEPTEMBER 2008–REVISED MARCH 2013
PIN DESCRIPTIONS
Pins Name I/O Type
(1)
Description
1 VIN1 I PWR Power in DC source Buck1 PMOS
2 ENSW1 I D Enable for Buck1 switcher, a logic HIGH enables Buck1
3 FB1 I A Buck1 input feedback terminal
4 AVIN I PWR Analog power for internal circuits
5 FB2 I A Buck2 input feedback terminal
6 ENSW2 I D Enable for Buck2 switcher, a logic HIGH enables Buck2
7 VIN2 I PWR Power in DC source Buck2 PMOS
8 VIN2 I PWR Power in DC source Buck2 PMOS
9 SW2 O A Buck2 switcher output
10 SW2 O A Buck2 switcher output
11 PGND_SW2 G G Buck2 NMOS Power Ground
12 PGND_SW2 G G Buck2 NMOS Power Ground
13 ENLDO I D Enable for LDO, a logic HIGH enables LDO
14 LDOGATE O A LDO Controller output to NMOS power transistor Gate
15 LDOFB I A LDO Controller input to feedback terminal
16 AGND G G Analog GND
17 GND G G Ground
18 nPOR O D nPOR Active low Reset output. nPOR remains LOW while the input
supply is below threshold, and goes HIGH after the threshold is
reached and timed delay
19 AVDD I PWR Analog Power Pin
20 PGND_SW1 G G Buck1 NMOS Power Ground
21 PGND_SW1 G G Buck1 NMOS Power Ground
22 SW1 O A Buck1 switcher output
23 SW1 O A Buck1 switcher output
24 VIN1 I PWR Power in DC source Buck1 PMOS
DAP DAP GND GND Connection isn't necessary for electrical performance, but it is
recommended for better thermal dissipation.
(1) A: Analog Pin D: Digital Pin G: Ground Pin PWR: Power Pin
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
Table 1. Default Options
Orderable Package Ordering Buck1 Buck2 Supplied As
Number Marking Specification
LM26484SQE 26484SQ NOPB PWM PWM 250 units, tape-and-reel
LM26484SQ 26484SQ NOPB PWM PWM 1000 units, tape-and-reel
LM26484SQX 26484SQ NOPB PWM PWM 4500 units, tape-and-reel
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