Datasheet

LT3572
10
3572fa
TYPICAL APPLICATION
SHDN
SHDNA
SHDNB
PWMA
PWMB
SYNC
PGOOD
RT
SS
10
11
12
7
6
3
15
4
14
V
IN
V
IN
3V TO 5V
SW
D1
L1
12μH
GND
LT3572
C2
10nF
C3
4.7μF
C4
20pF
C1
10μF
V
OUT
30V
50mA
R4
100k
R1
576k
R2
24.9k
3572 TA02
FB
OUTA
OUTA
OUTB
OUTB
13
218
18
19
17
16
5, 9, 20, 21
R3
34k
V
OUT
APPLICATIONS INFORMATION
of several ceramic capacitor manufacturers. Consult the
manufacturers for detailed information on their entire
selection of ceramic parts.
Table 2. Ceramic Capacitor Manufacturers
Taiyo Yuden [phone] www.t-yuden.com
AVX [phone] www.avxcorp.com
Murata [phone] www.murata.com
Diode Selection
A Schottky diode is recommended for use with the LT3572.
The Philips PMEG 3005 is a good choice. If the switch
voltage exceeds 30V, a PMEG 4005 (a 40V diode) can be
used. These diodes are rated to handle an average forward
current of 0.5A. For higher effi ciency, use a diode with bet-
ter thermal characteristics such as the On Semiconductor
MBRM140 (a 40V diode).
Layout Hints
As with all switching regulators, careful attention must be
paid to the PCB board layout and component placement.
To maximize effi ciency, switch rise and fall times are made
as short as possible. Note the vias under the Exposed Pad.
These should connect to a local ground plane for better
thermal performance.