Datasheet
LT3689/LT3689-5
30
3689fe
For more information www.linear.com/LT3689
TYPICAL APPLICATIONS
SW
DA
FB
RT
SYNC
f
SW
= 700kHz
WDI
RST
WDO
V
IN
EN/UVLO
V
IN
4.5V TO 36V
TRANSIENT
TO 60V
3.3V
700mA
R2
100k
L1
12µH
C2
0.1µF
D1
C3
22µF
R1
316k
GND
R
T
20.5k
LT3689
3689 TA03
BST
OUT
C
POR
C
WDT
C1
2.2µF
I/O
I/O
RESET
µP
W/TWINDOW TIMEOUT
WDEWATCHDOG_DEFEAT
C6
10nF
t
WDU
= 182ms
L1: CDR125NP-12MC
D1: MBRM140
C1, C2, C3: X7R or X5R
C4
10pF
C5
68nF
t
RST
= 157ms
3.3V Step-Down Converter
SW
DA
FB
RT
SYNC
f
SW
= 2MHz
WDI
RST
WDO
V
IN
EN/UVLO
V
IN
6.3V TO 18V
TRANSIENT
TO 60V
5V
700mA
L1
10µH
C2
0.1µF
D1
C3
4.7µF
GND
R
T
4.02k
LT3689-5
3689 TA04
BST
OUT
C
POR
C
WDT
C1
1µF
I/O
I/O
RESET
µP
W/TWINDOW TIMEOUT
WDEWATCHDOG_DEFEAT
C6
10nF
t
WDU
= 182ms
C1, C2, C3: X7R OR X5R
D1: MBRM140
C4
2.7pF
C5
68nF
t
RST
= 157ms
5V, 2MHz Step-Down Converter