LT8697
30
8697fb
For more information www.linear.com/LT8697
LINEAR TECHNOLOGY CORPORATION 2013
LT 0615 REV B • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com/LT8697
RELATED PARTS
TYPICAL APPLICATION
High Efficiency 5.2V Step-Down Converter with
Programmable Output Current Limit and SYNC
EN/UV
ICTRL
INTV
CC
PG
SYNC
TR/SS
RT
f
SW
= 300kHz TO 500kHz
FOR V
IN
= 6.5V TO 27V
SW
SYS
ISP
ISN
USB5V
RCBL
V
IN
V
IN
6V TO 42V
CURRENT LIMIT
2.67A/V FOR
V
CTRL
= 0.2V TO 1V
BST
L
22µH
R
SENSE
0.018Ω
GND
LT8697
C
VCC
1µF
300kHz TO
500kHz
C
SS
10nF
R
T
140k
100k
PGND
C
IN
10µF
C
BST
0.1µF
C
OUT
100µF
249k
8697 TA06
V
OUT
5.2V
0.5A TO 2.4A
C
IN
: X7R OR X5R
C
OUT
: 1210 CASE SIZE, X7R OR X5R
C
VCC
: X7R OR X5R
C
BST
: X7R OR X5R
L: SUMIDA CRH15D78/ANP-220MC
R
CDC
10k
PART NUMBER DESCRIPTION COMMENTS
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 Package
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
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
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(MIN)
= 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
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-10E
LT3970 40V, 350mA, 2.2MHz High Efficiency Micropower Step-Down
DC/DC Converter with I
Q
= 2.5µA
V
IN(MIN)
= 4.2V, V
IN(MAX)
= 40V, V
OUT(MIN)
= 1.21V, I
Q
= 2.5µA,
I
SD
<1µA, 3mm × 2mm DFN-10, MSOP-10
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
LT3480 36V with Transient Protection to 60V, 2A (I
OUT
), 2.4MHz, High
Efficiency Step-Down DC/DC Converter with Burst Mode
®
Operation
V
IN(MIN)
= 3.6V, V
IN(MAX)
= 36V, Transient to 60V, V
OUT(MIN)
=
0.78V, I
Q
= 70µA, I
SD
<1µA, 3mm × 3mm DFN-10, MSOP-10E
LT3980 58V with Transient Protection to 80V, 2A (I
OUT
), 2.4MHz, High
Efficiency Step-Down DC/DC Converter with Burst Mode 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
LT4180 Virtual Remote Sense Controller V
IN(MIN)
= 3.1V, V
IN(MAX)
= 50V, Transient to 80V, I
Q
= 1mA,
SSOP-24
LOAD CURRENT (A)
0
EFFICIENCY (%)
80
90
100
2.0
8697 TA06b
70
60
75
85
95
65
55
50
0.5
1.0
1.5
2.5
V
IN
= 8V
V
IN
= 12V
V
IN
= 24V
f
SW
= 300kHz
R
SENSE
= 18mΩ
DCR
L
= 20mΩ
R
CBL
= OPEN
V
OUT
= 5.2V
L = 22µH SUMIDA
Efficiency vs Load
