lt3641 Linear Technology Corporation, lt3641 Datasheet - Page 9

• Manufacturer Part Number: lt3641
• Description: Dual Monolithic Buck Regulator With Power-on Reset And Watchdog Timer
• Manufacturer: Linear Technology Corporation

BLOCK DIAGRAM
V
V
OUT1
OUT2
R2
R4
R1
R3
EN/
UVLO
SS1
FB1
SS2
FB2
PGOOD2
CPOR
100k
5.5V
2μA
2μA
2μA
2μA
+
–
–
A8
+
POR TIMER
50mV
RST1
1.265V
V
+
–
+
–
+
REF
A4
+
–
g
m1
–
RST2
A9
+
ENABLE
VC1
+
–
+
600mV
V
g
m2
REF
Σ
WDE
VC2
WATCHDOG
GENERATOR
TIMER
RAMP
Σ
WDI
–
+
+
–
A7
A3
WDO
OSCILLATOR
R
R
S
S
Q
Q
2μA
DRIVER
CIRCUIT
LOGIC
A1
A2
+
–
–
+
A5
A6
V
+
–
–
+
+
–
IN
1.165V
Q1
CWDT
SYNC
SW1
SW2
BST
EN2
SW
DA
RT
3641 BD
C
IN
D
D1
C
C
LT3641
IN2
BST
BST
L1
L2
V
IN2
V
V
OUT1
OUT2
C
C
9
OUT1
OUT2
3641f