lt3689-5 Linear Technology Corporation, lt3689-5 Datasheet - Page 28

• Manufacturer Part Number: lt3689-5
• Description: 700ma Step-down Regulator With Power-on Reset And Watchdog Timer
• Manufacturer: Linear Technology Corporation

LT3689/LT3689-5
TYPICAL APPLICATIONS
28
RESET
μP
RESET
μP
I/O
I/O
4.5V TO 36V
I/O
I/O
TRANSIENT
6.3V TO 18V
TRANSIENT
L1: CDR125NP-12MC
D1: MBRM140
C1, C2, C3: X7R or X5R
C1, C2, C3: X7R OR X5R
D1: MBRM140
TO 60V
TO 60V
C6
10nF
t
WATCHDOG_DEFEAT
WATCHDOG_DEFEAT
WDU
C6
10nF
t
WDU
WINDOW TIMEOUT
WINDOW TIMEOUT
V
V
IN
IN
= 182ms
= 182ms
5V, 2MHz Step-Down Converter
C1
2.2μF
C5
68nF
t
RST
C1
1μF
C5
68nF
t
RST
3.3V Step-Down Converter
= 157ms
= 157ms
W/T
WDE
WDI
WDO
RST
C
C
W/T
WDE
WDI
WDO
RST
C
C
WDT
POR
WDT
POR
V
V
IN
IN
LT3689-5
LT3689
GND
GND
EN/UVLO
EN/UVLO
f
f
SW
SW
SYNC
= 2MHz
SYNC
= 700kHz
OUT
BST
OUT
SW
BST
SW
DA
RT
FB
DA
RT
FB
D1
D1
C2
0.1μF
C2
0.1μF
R
4.02k
3689 TA04
T
R
20.5k
T
10pF
3689 TA03
C4
R2
100k
12μH
2.7pF
10μH
L1
L1
C4
316k
R1
C3
22μF
C3
4.7μF
3.3V
700mA
5V
700mA
3689fa