Datasheet

LT3988
24
3988f
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX: [phone]
●
www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2012
LT 0412 • PRINTED IN USA
relaTeD parTs
Typical applicaTion
PART NUMBER DESCRIPTION COMMENTS
LT3509 36V with Transient Protection to 60V, Dual 700mA (I
OUT
), 2.2MHz,
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,
3mm × 4mm DFN-14, MSOP-16E
LT3508 36V with Transient Protection to 40V, Dual 1.4A (I
OUT
), 2.5MHz, High
Efficiency Step-Down DC/DC Converter
V
IN
: 3.7V to 36V, V
OUT(MIN)
= 0.8V, I
Q
= 4.6mA, I
SD
= 1µA,
4mm × 4mm QFN-24, TSSOP-16E
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
: 3.6V to 58V, Transient to 80V, V
OUT(MIN)
= 0.79V, I
Q
= 75µA,
I
SD
< 1µA, 3mm × 4mm DFN-16, MSOP-16E
LT3970 40V, 350mA (I
OUT
), 2MHz, High Efficiency Step-Down DC/DC
Converter with Only 2.5µA of Quiescent Current
V
IN
: 4.2V to 40V, V
OUT(MIN)
= 1.2V, I
Q
= 2.5µA, I
SD
< 1µA,
2mm × 3mm DFN-10, MSOP-10
LT3990 60V, 350mA (I
OUT
), 2MHz, High Efficiency Step-Down DC/DC
Converter with only 2.5µA of Quiescent Current
V
IN
: 4.2V to 60V, V
OUT(MIN)
= 1.2V, I
Q
= 2.5µA, I
SD
< 1µA,
3mm × 3mm DFN-10, MSOP-16E
LT3971 38V, 1.2A (I
OUT
), 2MHz, High Efficiency Step-Down DC/DC Converter
with Only 2.8µA of Quiescent Current
V
IN
: 4.2V to 38V, V
OUT(MIN)
= 1.2V, I
Q
= 2.8µA, I
SD
< 1µA,
3mm × 3mm DFN-10, MSOP-10E
LT3991 55V, 1.2A (I
OUT
), 2MHz, High Efficiency Step-Down DC/DC Converter
with Only 2.8µA of Quiescent Current
V
IN
: 4.2V to 55V, V
OUT(MIN)
= 1.2V, I
Q
= 2.8µA, I
SD
< 1µA,
3mm × 3mm DFN-10, MSOP-10E
LT3507/LT3507A 36V, Triple 2.4A,1.4A, and 1.4A (I
OUT
), 2.5MHz, High Efficiency
Step-Down DC/DC Converter with LDO Controller
V
IN
: 4V to 36V, V
OUT(MIN)
= 0.8V, I
Q
= 7mA, I
SD
= 1µA,
5mm × 7mm QFN-38
LT3680 36V, 3A, 2.4MHz High Efficiency MicroPower Step-Down DC/DC
Converter
V
IN
: 3.6V to 36V, V
OUT(MIN)
= 0.8V, I
Q
= 75µA, I
SD
< 1µA,
3mm × 3mm DFN-10, MSOP-10E
LT3693 36V, 3A, 2.4MHz High Efficiency Step-Down DC/DC Converter V
IN
: 3.6V to 36V, V
OUT(MIN)
= 0.8V, I
Q
= 1.3mA, I
SD
< 1µA,
3mm × 3mm DFN-10, MSOP-10E
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, Transient to 60V, V
OUT(MIN)
= 0.78V, I
Q
= 70µA,
I
SD
< 1µA, 3mm × 3mm DFN-10, MSOP-10E
C2
1000pF
R2
57.6k
R4
34k
L1
15µH
V
OUT1
5V, 1A
V
OUT2
3.3V, 1A
C4
0.22µF
C6
22µF
22pF
3988 TA06
R3
10.2k
C3
1000pF
C1 TO C7: X5R OR X7R
D1, D2: DIODES, INC. B180
EN/UVLO THRESHOLD = 6.02V
L2
10µH
C5
0.22µF
D1 D2
C7
47µF
R5
10k
FB1
DA1
SW1
BOOST1
SYNC
500kHz
CLOCK
TRACK/SS1
FB2
DA2
SW2
BOOST2
BD
TRACK/SS2
EN/UVLO
GND
V
IN1
V
IN2
LT3988
R1
100k
RT
V
IN
7V TO 30V
80V TRANSIENT
R6
40.2k
R7
10k
C1
4.7µF
500kHz External Sync, 5V and 3.3V Outputs with 6V UVLO
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