lt3689-5 Linear Technology Corporation, lt3689-5 Datasheet - Page 10

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

LT3689/LT3689-5
BLOCK DIAGRAM
10
V
IN
V
OUT
R1
R2
R
C1
T
V
EN/UVLO
RT
SYNC
FB
WDE
WDI
W/T
IN
OUT
SOFT-START
525k
100k
LT3689-5
ONLY
+
INTERNAL
0.8V
FB
V
3.4V
80mV
IN
REF
ERROR AMP
–
+
–
+
TRANSITION
+
–
DETECT
SLOPE COMP
OSCILLATOR
WATCHDOG
R
TIMER
V
C
C
C
C
–
+
22μA
C
RESET PULSE
ADJUSTABLE
POR
GENERATOR
OPERATION
Burst Mode
V
R
S
SWITCH
C
LATCH
DETECT
CLAMP
DISABLE
Q
2μA
R
OUT
OUT
SEN
2μA
22μA
1μA
1μA
C
WDO
GND
OUT
WDT
RST
BST
SW
DA
3689 BD
D1
C2
L1
C3
V
3689fa
OUT