LT3688 LINER [Linear Technology], LT3688 Datasheet - Page 28

• Manufacturer Part Number: LT3688
• Description: Dual 800mA Step-Down Switching Regulator with Power-On Reset
• Manufacturer: LINER [Linear Technology]

LT3688
TYPICAL APPLICATION
RELATED PARTS
PART NUMBER
LT3640
LT3689/LT3689–5 36V, 60V Transient Protection, 800mA, 2.2MHz High Effi ciency
LT3686
LT3682
LT3971
LT3991
LT3970
LT3990
28
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
800mA
V
OUT1
5V
DESCRIPTION
35V, 55V MAX, Dual (1.3A, 1.1A), 2.5MHz High Effi ciency Step-
Down DC/DC Converter with POR Reset and Watchdog Timer
MicroPower Step-Down DC/DC Converter with POR Reset and
Watchdog Timer
37V, 55Vmax, 1.2A, 2.5MHz High Effi ciency Step-Down DC/DC
Converter
36V, 60Vmax, 1A, 2.2MHz High Effi ciency Micropower Step-
Down DC/DC Converter
38V, 1.2A (I
Converter with only 2.8uA of Quiescent Current
55V, 1.2A (I
Converter with only 2.8uA of Quiescent Current
40V, 350mA (I
Converter with only 2.5uA of Quiescent Current
60V, 350mA (I
Converter with only 2.5uA of Quiescent Current
●
C4
22μF
FAX: [phone]
OUT
OUT
C6
10pF
6V TO 36V
1MHz 5V and 3.3V Regulator with Power-On Reset and Watchdog Timers
OUT
OUT
), 2MHz, High Effi ciency Step-Down DC/DC
), 2MHz, High Effi ciency Step-Down DC/DC
), 2MHz, High Effi ciency Step-Down DC/DC
), 2MHz, High Effi ciency Step-Down DC/DC
ON OFF
R1
523k
R2
100k
V
C1-C5: X5R OR X7R
D1, D2: DFLS140
IN
18μH
L1
RESET
μP
I/O
I/O
●
1nF
C8
www.linear.com
C1
4.7μF
C2
0.22μF
D1
BST1
SW1
DA1
FB1
RUN/SS1
WDE
WDI
WDO
RST1
RST2
EN/UVLO
CONFIG
LT3688
GND
V
IN
RUN/SS2
C
C
SYNC
C
BST2
BIAS
SW2
POR1
POR2
DA2
WDT
FB2
RT
f
SW
COMMENTS
V
I
V
I
V
I
V
I
V
I
V
I
V
I
V
I
= 1MHz: 7V < V
Q
Q
Q
Q
Q
Q
Q
Q
IN
IN
IN
IN
IN
IN
IN
IN
1nF
C9
= <290μA, I
= 75μA, I
= 1.1mA, I
= 75μA, I
= 2.8μA, I
= 2.8μA, I
= 2.5μA, I
= 2.5μA, I
Min = 4V, V
Min = 3.6V, V
Min = 3.6V, V
Min = 3.6V, V
Min = 4.2V, V
Min = 4.2V, V
Min = 4.2V, V
Min = 4.2V, V
D2
R5
49.9k
C3
0.22μF
SD
SD
SD
SD
SD
SD
IN
SD
SD
C11
4.7nF
= <1μA, 3mm × 3mm QFN-16 Package
= <1μA, 3mm × 3mm DFN-12 Package
< 21V
IN
= <1μA, 3mm × 3mm DFN-10, MSOP-10E Package
= <1μA, 3mm × 3mm DFN-10, MSOP-10E Package
= <1μA, 2mm × 3mm DFN-10, MSOP-10E Package
= <1μA, 3mm × 3mm DFN-10, MSOP-16E Package
12μH
= <1μA, 3mm × 3mm DFN-10 Package
L2
= <1μA, 4mm × 5mm QFN-28 TSSOP-28E Package
IN
IN
IN
IN
IN
IN
IN
Max = 35V, Transient to 55V, V
Max = 36V, Transient to 60V, V
Max = 37V, Transient to 55V, V
Max = 36V, V
Max = 38V, V
Max = 55V, V
Max = 40V, V
Max = 60V, V
C10
4.7nF
R3
340k
R4
100k
3688 TA06
© LINEAR TECHNOLOGY CORPORA TION 2011
C12
1nF
OUT(MIN)
OUT(MIN)
OUT(MIN)
OUT(MIN)
OUT(MIN)
C7
10pF
= 0.8V,
= 1.2V,
= 1.2V,
= 1.2V,
= 1.2V,
C5
22μF
LT 0111 • PRINTED IN USA
V
3.3V
800mA
OUT2
OUT(MIN)
OUT(MIN)
OUT(MIN)
= 0.6V,
= 0.8V,
= 1.21V,
3688f