LT3689/LT3689-5
32
3689fd
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
LINEAR TECHNOLOGY CORPORATION 2010
LT 0211 REV D PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
PART NUMBER DESCRIPTION
COMMENTS
LT1766
60V, 1.2A (IOUT), 200kHz, High Efficiency Step-Down DC/DC
Converter
VIN: 5.5V to 60V, VOUT(MIN) = 1.20V, IQ = 2.5mA, ISD = 25A, TSSOP-16
and TSSOP-16E Packages
LT1936
36V, 1.4A (IOUT), 500kHz High Efficiency Step-Down DC/DC
Converter
VIN: 3.6V to 36V, VOUT(MIN) = 1.2V, IQ = 1.9mA, ISD <1A, MS8E Package
LT1976/LT1977 60V, 1.2A (IOUT), 200kHz/500kHz, High Efficiency Step-Down
DC/DC Converter with Burst Mode Operation
VIN: 3.3V to 60V, VOUT(MIN) = 1.20V, IQ = 100A, ISD <1A, TSSOP-16E
Package
LT3434/LT3435 60V, 2.4A (IOUT), 200kHz/500kHz, High Efficiency Step-Down
DC/DC Converter with Burst Mode Operation
VIN: 3.3V to 60V, VOUT(MIN) = 1.20V, IQ = 100mA, ISD <1A, TSSOP-16E
Package
LT3437
60V, 400mA (IOUT), Micropower Step-Down DC/DC
Converter with Burst Mode Operation
VIN: 3.3V to 60V, VOUT(MIN) = 1.25V, IQ = 100A, ISD <1A, 3mm × 3mm
DFN-10 and TSSOP-16E Packages
LT3480
36V with Transient Protection to 60V, 2A (IOUT), 2.4MHz,
High Efficiency Step-Down DC/DC Converter with Burst
Mode Operation
VIN: 3.6V to 38V, VOUT(MIN) = 0.78V, IQ = 70A, ISD <1A, 3mm × 3mm
DFN-10 and MSOP-10E Packages
LT3481
34V with Transient Protection to 36V, 2A (IOUT), 2.8MHz,
High Efficiency Step-Down DC/DC Converter with Burst
Mode Operation
VIN: 3.6V to 34V, VOUT(MIN) = 1.26V, IQ = 50mA, ISD <1A, 3mm × 3mm
DFN-10 and MSOP-10E Packages
LT3493
36V, 1.4A (IOUT), 750kHz High Efficiency Step-Down DC/DC
Converter
VIN: 3.6V to 36V, VOUT(MIN) = 0.8V, IQ = 1.9mA, ISD <1A, 2mm × 3mm
DFN-6 Package
LT3500
36V, 40VMAX, 2A, 2.5MHz High Efficiency Step-Down DC/DC
Converter and LDO Controller
VIN: 3.6V to 36V, VOUT(MIN) = 0.8V, IQ = 2.5mA, ISD <10A, 3mm × 3mm
DFN-10 Package
LT3505
36V with Transient Protection to 40V, 1.4A (IOUT), 3MHz,
High Efficiency Step-Down DC/DC Converter
VIN: 3.6V to 34V, VOUT(MIN) = 0.78V, IQ = 2mA, ISD = 2A, 3mm × 3mm
DFN-8 and MSOP-8E Packages
LT3507
36V 2.5MHz, Triple (2.4A + 1.5A + 1.5A (IOUT)) with LDO
Controller High Efficiency Step-Down DC/DC Converter
VIN: 3.6V to 36V, VOUT(MIN) = 0.8V, IQ = 2.5mA, ISD = 10A, TSSOP-16
and TSSOP-16E Packages
LT3508
36V with Transient Protection to 40V, Dual 1.4A (IOUT),
3MHz, High Efficiency Step-Down DC/DC Converter
VIN: 3.7V to 37V, VOUT(MIN) = 0.8V, IQ = 4.6mA, ISD = 1A, 4mm × 4mm
QFN-24 and TSSOP-16E Packages
LT3682
36V, 60VMAX, 1A, 2.2MHz High Efficiency Micropower Step-
Down DC/DC Converter
VIN: 3.6V to 36V, VOUT(MIN) = 0.8V, IQ = 75mA, ISD <1A, 3mm × 3mm
DFN-12 Package
LT3684
34V with Transient Protection to 36V, 2A (IOUT), 2.8MHz,
High Efficiency Step-Down DC/DC Converter
VIN: 3.6V to 34V, VOUT(MIN) = 1.26V, IQ = 850A, ISD <1A, 3mm × 3mm
DFN-10 and MSOP-10E Packages
LT3685
36V with Transient Protection to 60V, 2A (IOUT), 2.4MHz,
High Efficiency Step-Down DC/DC Converter
VIN: 3.6V to 38V, VOUT(MIN) = 0.78V, IQ = 70A, ISD <1A, 3mm × 3mm
DFN-10 and MSOP-10E Packages
SW
DA
FB
RT
SYNC
fSW = 900kHz
WDI
RST
WDO
VIN
EN/UVLO
VIN
3.6V TO 16V
TRANSIENT TO 27V
1.8V
700mA
R2
102k
L1
4.7H
C2
0.1F
D1
C3
47F
R1
127k
GND
RT
14.7k
LT3689
3689 TA05
BST
OUT
CPOR
CWDT
C1
1F
I/O
RESET
P
W/T
WINDOW TIMEOUT
WDE
WATCHDOG_DEFEAT
C6
10nF
tWDU = 182ms
L1: WE-PD2: 7447745047
D1: MBRM140
C1, C2, C3: X7R OR X5R
C4
15pF
C5
68nF
tRST = 157ms
1.8V Step-Down Converter with System Reset Generated by
Watchdog Timing or Output Voltage Failure