lt3688fe Linear Technology Corporation, lt3688fe Datasheet - Page 26

• Manufacturer Part Number: lt3688fe
• Description: Lt3688 - Dual 800ma Step-down Switching Regulator With Power-on Reset And Watchdog Timer
• Manufacturer: Linear Technology Corporation

LT3688
TYPICAL APPLICATIONS
26
800mA
V
800mA
OUT1
1.2V
V
OUT1
5V
C4
100μF
C4
10μF
C6
10μF
6V TO 36V
C6
10pF
4V TO 36V
ON OFF
V
C1-C5: X5R OR X7R
D1, D2: DIODES INC. B140
R1
523k
R2
100k
ON OFF
IN
3.3V and 1.2V Regulator with Power-On Reset Timer and
Defeatable Watchdog, Timing Error Resets Microprocessor
R1
90.9k
R2
182k
WATCHDOG DEFEAT
V
C1-C5: X5R OR X7R
D1, D2: DIODES INC. B140
8.2μH
2MHz Switching Frequency, 5V and 3.3V Regulator with
Power-On Reset and Watchdog Timers
IN
8.2μH
L1
RESET
μP
L1
RESET
μP
I/O
I/O
D1
I/O
1nF
1nF
C8
C8
C2
0.1μF
C1
4.7μF
D1
C1
4.7μF
C2
0.22μF
EN/UVLO
BST1
SW1
DA1
FB1
CONFIG
RUN/SS1
WDE
WDI
WDO
RST1
RST2
EN/UVLO
BST1
SW1
DA1
FB1
CONFIG
RUN/SS1
WDE
WDI
WDO
RST1
RST2
LT3688
GND
V
LT3688
IN
GND
V
IN
RUN/SS2
C
C
RUN/SS2
C
SYNC
BST2
BIAS
POR1
POR2
SW2
DA2
WDT
FB2
RT
C
C
C
SYNC
BST2
f
BIAS
POR1
POR2
SW2
SW
DA2
WDT
FB2
RT
= 2MHz: 8V < V
1nF
C9
1nF
C9
f
SW
D2
R5
20k
C3
0.1μF
D2
R5
143k
C3
0.22μF
= 400kHz: V
IN
C11
4.7nF
< 16V, T
8.2μH
L2
C11
4.7nF
15μH
IN
L2
< 25V
J
C10
4.7nF
< 85°C
C10
4.7nF
R3
316k
R4
100k
R3
316k
R4
100k
3688 TA04
C12
1nF
3688 TA05
C12
1nF
C7
10pF
C7
10pF
C5
22μF
V
3.3V
800mA
OUT2
C5
22μF
V
3.3V
800mA
OUT2
3688f