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LM48511Datasheet PDF
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19
18
17
16
1515
14
13
FB_SEL
SW
SW
SOFTSTART
GND
LS+
SS/FF
V1
VGO+
IN+
VGO-
FB
7
1
2
3
4
5
6
REGGND
REGGND
FB_GND1
FB_GND0
SD_AMP
LSGND
PV1
LSGND
8 9 10 11 12
LS-
IN-
SD_BOOST
24 23 22 21 20
V
DD
3
LM48511
www.ti.com
SNAS416H –JULY 2007–REVISED AUGUST 2015
Product Folder Links: LM48511
Submit Documentation FeedbackCopyright © 2007–2015, Texas Instruments Incorporated
5 Pin Configuration and Functions
NHZ Package
24-Pin WQFN
Top View
Pin Functions
PIN
I/O DESCRIPTION
NAME NO.
DAP – — To be soldered to board for enhanced thermal dissipation. Connect to GND plane.
FB 19 —
Regulator feedback input
Connect FB to an external resistive voltage divider to set the boost output voltage.
FB_GND0 21 — Ground return for R
3
, R
1
resistor divider
FB_GND1 20 — Ground return for R
3
, R
2
resistor divider
FB_SEL 1 I
Regulator feedback select
Connect to VDD to select feedback network connected to FB_GND1. Connect to GND to select feedback network
connected to FB_GND0.
GND 7 — Signal ground
IN– 15 I Amplifier inverting input
IN+ 16 I Amplifier noninverting input
LS+ 8 O Amplifier noninverting output
LS– 12 O Amplifier inverting output
LSGND 9, 11 — Amplifier H-Bridge ground
PV1
10 —
Amplifier H-Bridge power supply
Connect to V1.
REGGND 22, 23 — Power ground (booster)
SD_AMP 5 I
Amplifier active-low shutdown
Connect to V
DD
for normal operation. Connect to GND to disable amplifier.
SD_BOOST 24 I
Regulator active-low shutdown.
Connect to V
DD
for normal operation. Connect to GND to disable regulator.
SOFT-START 4 — Soft-start capacitor
SS/FF 6 I
Modulation mode select.
Connect to V
DD
for spread spectrum mode (SS). Connect to GND for fixed frequency mode (FF).
SW 2, 3 — Drain of the internal FET switch
V1
13 —
Amplifier supply voltage
Connect to PV1
VDD 18 — Power supply
VG0+ 14 O Amplifier noninverting gain output
VG0– 17 O Amplifier inverting gain output