Datasheet

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
LM48511
www.ti.com
SNAS416G JULY 2007REVISED MAY 2013
Connection Diagram
Figure 3. 24-Pin WQFN
Top View
See NHZ0024B Package
PIN DESCRIPTIONS
WQFN-24 Pin Name Function
Regulator Feedback Select. Connect to VDD to select feedback
1 FB_SEL network connected to FB_GND1. Connect to GND to select feedback
network connected to FB_GND0.
2, 3 SW Drain of the Internal FET Switch
4 SOFTSTART Soft Start Capacitor
Amplifier Active Low Shutdown. Connect to V
DD
for normal operation.
5 SD_AMP
Connect to GND to disable amplifier.
Modulation Mode Select. Connect to V
DD
for spread spectrum mode
6 SS/FF
(SS). Connect to GND for fixed frequency mode (FF).
7 GND Signal Ground
8 LS+ Amplifier Non-Inverting Output
9, 11 LSGND Amplifier H-Bridge Ground
10 PV1 Amplifier H-Bridge Power Supply. Connect to V1.
12 LS- Amplifier Inverting Output
13 V1 Amplifier Supply Voltage. Connect to PV1
14 VG0+ Amplifier Non-Inverting Gain Output
15 IN- Amplifier Inverting Input
16 IN+ Amplifier Non-Inverting Input
17 VG0– Amplifier Inverting Gain Output
18 VDD Power Supply
Regulator Feedback Input. Connect FB to an external resistive voltage
19 FB
divider to set the boost output voltage.
20 FB_GND1 Ground return for R
3
, R
2
resistor divider
21 FB_GND0 Ground return for R
3
, R
1
resistor divider
22, 23 REGGND Power Ground (Booster)
Regulator Active Low Shutdown. Connect to V
DD
for normal operation.
24 SD_BOOST
Connect to GND to disable regulator.
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