Datasheet
LT3689/LT3689-5
34
3689fe
For more information www.linear.com/LT3689
LINEAR TECHNOLOGY CORPORATION 2010
LT 0613 REV E • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com/LT3689
RELATED PARTS
TYPICAL APPLICATION
PART NUMBER DESCRIPTION COMMENTS
LT1766 60V, 1.2A (I
OUT
), 200kHz, High Efficiency Step-Down DC/DC
Converter
V
IN
: 5.5V to 60V, V
OUT(MIN)
= 1.20V, I
Q
= 2.5mA, I
SD
= 25µA, TSSOP-16
and TSSOP-16E Packages
LT1936 36V, 1.4A (I
OUT
), 500kHz High Efficiency Step-Down DC/DC
Converter
V
IN
: 3.6V to 36V, V
OUT(MIN)
= 1.2V, I
Q
= 1.9mA, I
SD
<1µA, MS8E Package
LT1976/LT1977 60V, 1.2A (I
OUT
), 200kHz/500kHz, High Efficiency Step-Down
DC/DC Converter with Burst Mode Operation
V
IN
: 3.3V to 60V, V
OUT(MIN)
= 1.20V, I
Q
= 100µA, I
SD
<1µA, TSSOP-16E
Package
LT3434/LT3435 60V, 2.4A (I
OUT
), 200kHz/500kHz, High Efficiency Step-Down
DC/DC Converter with Burst Mode Operation
V
IN
: 3.3V to 60V, V
OUT(MIN)
= 1.20V, I
Q
= 100mA, I
SD
<1µA, TSSOP-16E
Package
LT3437 60V, 400mA (I
OUT
), Micropower Step-Down DC/DC
Converter with Burst Mode Operation
V
IN
: 3.3V to 60V, V
OUT(MIN)
= 1.25V, I
Q
= 100µA, I
SD
<1µA, 3mm × 3mm
DFN-10 and TSSOP-16E Packages
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
: 3.6V to 38V, V
OUT(MIN)
= 0.78V, I
Q
= 70µA, I
SD
<1µA, 3mm × 3mm
DFN-10 and MSOP-10E Packages
LT3481 34V with Transient Protection to 36V, 2A (I
OUT
), 2.8MHz,
High Efficiency Step-Down DC/DC Converter with Burst
Mode Operation
V
IN
: 3.6V to 34V, V
OUT(MIN)
= 1.26V, I
Q
= 50mA, I
SD
<1µA, 3mm × 3mm
DFN-10 and MSOP-10E Packages
LT3493 36V, 1.4A (I
OUT
), 750kHz High Efficiency Step-Down DC/DC
Converter
V
IN
: 3.6V to 36V, V
OUT(MIN)
= 0.8V, I
Q
= 1.9mA, I
SD
<1µA, 2mm × 3mm
DFN-6 Package
LT3500 36V, 40V
MAX
, 2A, 2.5MHz High Efficiency Step-Down DC/DC
Converter and LDO Controller
V
IN
: 3.6V to 36V, V
OUT(MIN)
= 0.8V, I
Q
= 2.5mA, I
SD
<10µA, 3mm × 3mm
DFN-10 Package
LT3505 36V with Transient Protection to 40V, 1.4A (I
OUT
), 3MHz,
High Efficiency Step-Down DC/DC Converter
V
IN
: 3.6V to 34V, V
OUT(MIN)
= 0.78V, I
Q
= 2mA, I
SD
= 2µA, 3mm × 3mm
DFN-8 and MSOP-8E Packages
LT3507 36V 2.5MHz, Triple (2.4A + 1.5A + 1.5A (I
OUT
)) with LDO
Controller High Efficiency Step-Down DC/DC Converter
V
IN
: 3.6V to 36V, V
OUT(MIN)
= 0.8V, I
Q
= 2.5mA, I
SD
= 10µA, TSSOP-16
and TSSOP-16E Packages
LT3508 36V with Transient Protection to 40V, Dual 1.4A (I
OUT
),
3MHz, High Efficiency Step-Down DC/DC Converter
V
IN
: 3.7V to 37V, V
OUT(MIN)
= 0.8V, I
Q
= 4.6mA, I
SD
= 1µA, 4mm × 4mm
QFN-24 and TSSOP-16E Packages
LT3682 36V, 60V
MAX
, 1A, 2.2MHz High Efficiency Micropower Step-
Down DC/DC Converter
V
IN
: 3.6V to 36V, V
OUT(MIN)
= 0.8V, I
Q
= 75mA, I
SD
<1µA, 3mm × 3mm
DFN-12 Package
LT3684 34V with Transient Protection to 36V, 2A (I
OUT
), 2.8MHz,
High Efficiency Step-Down DC/DC Converter
V
IN
: 3.6V to 34V, V
OUT(MIN)
= 1.26V, I
Q
= 850µA, I
SD
<1µA, 3mm × 3mm
DFN-10 and MSOP-10E Packages
LT3685 36V with Transient Protection to 60V, 2A (I
OUT
), 2.4MHz,
High Efficiency Step-Down DC/DC Converter
V
IN
: 3.6V to 38V, V
OUT(MIN)
= 0.78V, I
Q
= 70µA, I
SD
<1µA, 3mm × 3mm
DFN-10 and MSOP-10E Packages
SW
DA
FB
RT
SYNC
f
SW
= 900kHz
WDI
RST
WDO
V
IN
EN/UVLO
V
IN
3.6V TO 16V
TRANSIENT TO 27V
1.8V
700mA
R2
102k
L1
4.7µH
C2
0.1µF
D1
C3
47µF
R1
127k
GND
R
T
14.7k
LT3689
3689 TA05
BST
OUT
C
POR
C
WDT
C1
1µF
I/O
RESET
µP
W/TWINDOW TIMEOUT
WDEWATCHDOG_DEFEAT
C6
10nF
t
WDU
= 182ms
L1: WE-PD2: 7447745047
D1: MBRM140
C1, C2, C3: X7R OR X5R
C4
15pF
C5
68nF
t
RST
= 157ms
1.8V Step-Down Converter with System Reset Generated by
Watchdog Timing or Output Voltage Failure