For more information www.linear.com/LT3697
LT3697
32
3697f
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com/LT3697
LINEAR TECHNOLOGY CORPORATION 2014
LT 0914 • PRINTED IN USA
relaTeD parTs
Typical applicaTion
PART NUMBER DESCRIPTION COMMENTS
LT8697 5V USB,42V Input, 2.5A, 95% Efficiency, 2.2MHz Synchronous
Step-Down DC/DC Converter with Cable Drop Compensation
V
IN(MIN)
= 5V, V
IN(MAX)
= 42V, V
OUT(MIN)
= 5.0V to 5.25V, I
SD
<1µA,
3mm × 5mm QFN-24
LT3971A-5 38V, 1.2A, 2.2MHz High Efficiency Micropower Step-Down DC/DC
Converter with I
Q
= 2.8µA
V
IN(MIN)
= 4.2V, V
IN(MAX)
= 40V, V
OUT
= 5V, I
Q
= 2.8µA, I
SD
<1µA,
MSOP-10E
LT6110 Cable/Wire Drop Compensator V
IN(MIN)
= 2V, V
IN(MAX)
= 50V, V
OUT(MIN)
= 0.4V, I
Q
= 16µA, SOT-8,
2mm × 2mm DFN-8
LT8610 42V, 2.5A, 96% Efficiency, 2.2MHz Synchronous MicroPower
Step-Down DC/DC Converter with I
Q
= 2.5µA
V
IN(MIN)
= 3.4V, V
IN(MAX)
= 42V, V
OUT(MIN)
= 0.985V, I
Q
= 2.5µA,
I
SD
<1µA, MSOP-16E
LT8610A/
LT8610AB
42V, 3.5A, 96% Efficiency, 2.2MHz Synchronous MicroPower
Step-Down DC/DC Converter with I
Q
= 2.5µA
V
IN(MIN)
= 3.4V, V
IN(MAX)
= 42V, V
OUT(MIN)
= 0.985V, I
Q
= 2.5µA,
I
SD
<1µA, MSOP-16E
LT8611 42V, 2.5A, 96% Efficiency, 2.2MHz Synchronous MicroPower
Step-Down DC/DC Converter with I
Q
= 2.5µA and Input/Output
Current Limit/Monitor
V
IN(MIN)
= 3.4V, V
IN(MAX)
= 42V, V
OUT(MIN)
= 0.985V, I
Q
= 2.5µA,
I
SD
<1µA, 3mm × 5mm QFN-24
LT8612 42V, 6A, 96% Efficiency, 2.2MHz Synchronous MicroPower Step-
Down DC/DC Converter with I
Q
= 2.5µA
V
IN(MIN)
= 3.4V, V
IN(MAX)
= 42V, V
OUT(MIN)
= 0.985V, I
Q
= 3µA,
I
SD
<1µA, 3mm × 6mm QFN-28
LT8614 42V, 4A, 96% Efficiency, 2.2MHz Silent Switcher Synchronous
MicroPower Step-Down DC/DC Converter with I
Q
= 2.5µA
V
IN(MIN)
= 3.4V, V
IN(MAX)
= 42V, V
OUT(MIN)
= 0.985V, I
Q
= 2.5µA,
I
SD
<1µA, 3mm × 4mm QFN-20
LT3690 36V with 60V Transient Protection , 4A, 92% Efficiency, 1.5MHz
Synchronous MicroPower Step-Down DC/DC Converter with I
Q
= 70µA
V
IN(MIN)
= 3.9V, V
IN(MAX)
= 36V, V
OUT(MIN)
= 0.985V, I
Q
= 70µA,
I
SD
<1µA, 4mm × 6mm QFN-26
LT3991 55V, 1.2A, 2.2MHz High Efficiency MicroPower Step-Down DC/DC
Converter with I
Q
= 2.8µA
V
IN(MIN)
= 4.2V, V
IN(MAX)
= 62V, V
OUT(MIN)
= 1.21V, I
Q
= 2.8µA,
I
SD
<1µA, 3mm × 3mm DFN-10, MSOP-16E
LT3990 62V, 350mA, 2.2MHz High Efficiency MicroPower Step-Down DC/
DC Converter with I
Q
= 2.5µA
V
IN(MIN)
= 4.2V, V
IN(MAX)
= 62V, V
OUT(MIN)
= 1.21V, I
Q
= 2.5µA,
I
SD
<1µA, 3mm × 2mm DFN-10, MSOP-10
LT3980 58V with Transient Protection to 80V, 2A (I
OUT
), 2.4MHz, High
Efficiency Step-Down DC/DC Converter with BurstMode Operation
V
IN(MIN)
= 3.6V, V
IN(MAX)
= 58V Transient to 80V, V
OUT(MIN)
= 0.78V,
I
Q
= 85µA, I
SD
<1µA, 3mm × 4mm DFN-16, MSOP-16E
R
SENSE
0.022Ω
0.1Ω
L
4.7µH
C
IN
4.7µF
V
IN
BST
LT3697
EN SW
SYS
ISP
ISN
USB5V
RCBL
F LT
RT
VC
RLIM
SYNC
GND
C
F
120pF
C
C
470pF
C
BST
1µF
C
OUT
47µF
C
CDC
10nF
V
IN
6V TO 18V
0.1Ω
R5V1
49.9k
R
USB
9.09k
R
CDC
1k
R
T
63.4k
R
CBL
22.1k
R
MON
100k
V
MON
= 0.43V/A
3697 TA06
R
C
7.5k
3 METERS AWG 20
TWISTED PAIR CABLE
V
LOAD
LOAD
–
+
ONOFF
BST
V
OUT
D
CATCH
C
BUS
100µF
f = 1MHz FOR
V
IN
= 8V TO 18V
I
LOAD
= 0.5A TO 2.5A
C
BST
: X7R OR X5R
C
IN
: X7R OR X5R
C
OUT
: 1210 CASE SIZE, X7R OR X5R
D
CATCH
: CENTRAL SEMI CMSH3-40MA
D
BST
: CENTRAL SEMI CMDSH2-3
V
IN(MIN)
= 6V AT 0.5A I
LOAD
7V AT 2.5A I
LOAD
+
5.1V Step Down Converter with Cable Drop Compensation and Output Current Monitor
250µs/DIV
3697 TA06a
5.50
5.25
5.00
4.75
2.0
1.0
0.0
VOLTAGE (V)
2.0
1.0
0.0
CURRENT (A)
I
LOAD
25mA/µs
V
MON
0.43V/A
V
LOAD
V
IN
= 12V
